Terminal, wireless communication method, and base station

Abstract

A terminal of one embodiment of the present disclosure includes a reception unit that receives any one of a secondary synchronization signal (SSS) and a channel state information-reference signal (CSI-RS), and a control unit that measures a layer 1-signal to interference plus noise ratio (L1-SINR) from the signal. The L1-SINR is obtained by dividing a linear average of power contributions of resource elements over which the signal is carried by a linear average of power contributions of noise and interference. The noise and the interference are total received power on a resource indicated by a higher level.

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

[0002] In a Universal Mobile Telecommunications System (UMTS) network, Long Term Evolution (LTE) has been standardized for the purpose of further high-speed data rates, low latency, and so on (Non-Patent Literature 1). Furthermore, LTE-Advanced (3GPP Rel. 10-14) has been standardized for the purpose of further capacity, higher speed, and so on of LTE (3rd Generation Partnership Project (3GPP) Release (Rel.) 8, 9).

[0003] A subsequent system of LTE (for example, also referred to as 5th generation mobile communication system (5G), 5G (plus), 6th generation mobile communication system (6G), New Radio (NR), 3GPP Rel. 15 onwards, and so on) is also being studied.

[0004] In the existing LTE system (for example, 3GPP Rel. 8-14), a User Equipment (UE) transmits Uplink Control Information (UCI) using at least one of a UL data channel (for example, Physical Uplink Shared Channel (PUSCH)) and a UL control channel (for example, Physical Uplink Control Channel (PUCCH)).

[0005] PRIOR ART DOCUMENTS

[0006] NON-PATENT LITERATURE

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

[0008] PROBLEMS TO BE SOLVED BY THE INVENTION

[0009] In a future wireless communication system (e.g., NR), a UE measures a signal-to-noise and interference ratio (SINR). However, it is not clear how to measure interference. If interference is not properly measured, there is a concern that this leads to a decrease in throughput and a decrease in system performance.

[0010] Therefore, an object of the present disclosure is to provide a terminal, a wireless communication method, and a base station that properly measure interference.

[0011] MEANS FOR SOLVING THE PROBLEMS

[0012] A terminal of one embodiment of the present disclosure includes a reception unit that receives any one of a secondary synchronization signal (SSS) and a channel state information (CSI)-reference signal (RS), and a control unit that measures a layer 1-signal-to-interference-plus-noise ratio (L1-SINR) from the signal. The L1-SINR is obtained by dividing a linear average of power contributions of the signal by a linear average of power contributions of noise and interference. The noise and the interference are total received power on resources indicated by a higher layer.

[0013] EFFECTS OF THE INVENTION

[0014] According to one embodiment of the present disclosure, interference is properly measured. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 FIG. 1 is a diagram illustrating an example of a concept of an interference measurement resource.

[0016] Figure 2 FIG. 4 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to one embodiment.

[0017] Figure 3 is a diagram showing an example of the structure of a base station involved in one embodiment.

[0018] Figure 4 is a diagram showing an example of the structure of a user terminal involved in one embodiment.

[0019] Figure 5 is a diagram showing an example of the hardware structure of a base station and a user terminal involved in one embodiment. DETAILED DESCRIPTION

[0020] (CSI report (or reporting))

[0021] In Rel. 15 NR, a terminal (also referred to as a user terminal, a User Equipment (UE), or the like) generates (also referred to as decides, calculates, estimates, measures, or the like) channel state information (Channel State Information (CSI)) from a reference signal (Reference Signal (RS)) (or a resource for the RS), and transmits (also referred to as reports, feeds back, or the like) the generated CSI to a network (for example, a base station). The CSI can also be transmitted to the base station using, for example, an uplink control channel (for example, a Physical Uplink Control Channel (PUCCH), a physical uplink control channel) or an uplink shared channel (for example, a Physical Uplink Shared Channel (PUSCH), a physical uplink shared channel).

[0022] The RS used in the generation of the CSI is, for example, at least one of a Channel State Information Reference Signal (CSI-RS), a Synchronization Signal / Physical Broadcast Channel (SS / PBCH) block, a Synchronization Signal (SS), a DeModulation Reference Signal (DMRS), or the like.

[0023] The CSI-RS can also include at least one of a Non Zero Power (NZP) CSI-RS and a CSI-Interference Management (CSI-IM). The SS / PBCH block is a block including an SS and a PBCH (and a corresponding DMRS), and can also be referred to as an SS block (SSB), etc. In addition, the SS can also include at least one of a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS).

[0024] The CSI can also include at least one of a Channel Quality Indicator (CQI), a Precoding Matrix Indicator (PMI), a CSI-RS Resource Indicator (CRI), an SS / PBCH Block Indicator (SSBRI), a Layer Indicator (LI), a Rank Indicator (RI), a L1-RSRP (Layer 1 Reference Signal Received Power), a L1-RSRQ (Reference Signal Received Quality), a L1-SINR (Signal-to-Noise and Interference Ratio or Signal to Interference plus Noise Ratio), a L1-SNR (Signal to Noise Ratio), etc.

[0025] The UE can also receive information (report configuration information) related to the CSI report, and control the CSI report according to the report configuration information. The report configuration information can also be, for example, a "CSI-ReportConfig" of an Information Element (IE) of a Radio Resource Control (RRC). In addition, in the present disclosure, the RRC IE can also be replaced with an RRC parameter, a higher layer parameter, etc.

[0026] The report setting information (for example, "CSI-ReportConfig" of RRC IE) can also contain at least one of the following, for example.

[0027] • Information on the type of CSI report (report type information, for example, "reportConfigType" of RRC IE)

[0028] • Information on one or more quantities (one or more CSI parameters) of CSI that should be reported (report quantity information, for example, "reportQuantity" of RRC IE)

[0029] • Information on RS resources used in the generation of the quantity (the CSI parameter) (resource information, for example, "CSI-ResourceConfigId" of RRC IE)

[0030] • Information on the frequency domain that is the object of the CSI report (frequency domain information, for example, "reportFreqConfiguration" of RRC IE)

[0031] The report type information can also indicate, for example, periodic CSI (P-CSI) reporting, aperiodic CSI (A-CSI) reporting, or semi-persistent (semi-persistent, semi- persistent (SP-CSI)) reporting.

[0032] In addition, the report quantity information can also specify a combination of at least one of the above-described CSI parameters (for example, CRI, RI, PMI, CQI, LI, L1-RSRP, and the like).

[0033] In addition, the resource information can also be an ID of the RS resource. The RS resource can also contain, for example, a non-zero power CSI-RS resource or an SSB, a CSI-IM resource (for example, a zero power CSI-RS resource).

[0034] In addition, the frequency domain information can also indicate a frequency granularity of the CSI report. The frequency granularity can include, for example, a wideband and a subband. The wideband is the entire CSI reporting band. The wideband can be, for example, the entire of a certain carrier (Component Carrier (CC)), cell, serving cell, or the entire of a bandwidth part (BWP) within a certain carrier. The wideband can also be referred to as a CSI reporting band or an entire CSI reporting band.

[0035] In addition, the subband is a part of the wideband and can be composed of one or more resource blocks (RBs or Physical Resource Blocks (PRBs)). The size of the subband can be determined according to the size of the BWP (number of PRBs).

[0036] The frequency domain information can also indicate which PMI of the wideband or the subband is reported (the frequency domain information can include, for example, a "pmi-FormatIndicator" of an RRC IE used to determine which of the wideband PMI report or the subband PMI report is reported). The UE can determine the frequency granularity of the CSI report (i.e., which of the wideband PMI report or the subband PMI report) according to at least one of the above-described reporting quantity information and the frequency domain information.

[0037] In the case where the wideband PMI report is set (determined), one wideband PMI can be reported for the entire CSI reporting band. On the other hand, in the case where the subband PMI report is set, a single wideband indication i1 can be reported for the entire CSI reporting band, and one subband indication i2 (e.g., a subband indication for each subband) for each of one or more subbands within the entire CSI reporting band can be reported.

[0038] The UE performs channel estimation using the received RS, estimates a channel matrix H, and feeds back an index (PMI) determined according to the estimated channel matrix.

[0039] The PMI can also indicate a precoding matrix (also referred to simply as "precoding") that the UE considers suitable for downlink (DL) transmission to the UE. Each value of the PMI can also correspond to one precoding matrix. A set of values of the PMI can also correspond to a set of different precoding matrices referred to as a precoding codebook (also referred to simply as a codebook).

[0040] In the spatial domain, the CSI report can also contain more than one type of CSI. For example, the CSI can contain at least one of a first type (Type 1 CSI) for selection of a single beam and a second type (Type 2 CSI) for selection of multiple beams. A single beam can be replaced by a single layer, and multiple beams can be replaced by multiple layers. In addition, Type 1 CSI can not assume multi-user multiple input multiple output (MIMO), and Type 2 CSI can assume multi-user MIMO.

[0041] The codebook described above can contain a codebook for Type 1 CSI (also referred to as a Type 1 codebook, etc.), and a codebook for Type 2 CSI (also referred to as a Type 2 codebook, etc.). In addition, Type 1 CSI can contain both Type 1 single-panel CSI and Type 1 multi-panel CSI, or can be specified as a separate codebook (Type 1 single-panel codebook, Type 1 multi-panel codebook).

[0042] In the present disclosure, Type 1 and Type I can be replaced with each other. In the present disclosure, Type 2 and Type II can be replaced with each other.

[0043] The uplink control information (UCI) type can contain at least one of a hybrid automatic repeat request acknowledgement (HARQ-ACK), a scheduling request (SR), and CSI. The UCI can be carried by PUCCH or PUSCH.

[0044] In Rel. 15 NR, the UCI can contain one CSI part for wideband PMI feedback. If CSI report #n is reported, it contains PMI wideband information.

[0045] In Rel. 15 NR, the UCI can contain two CSI parts for subband PMI feedback. CSI part 1 contains wideband PMI information. CSI part 2 contains one wideband PMI information and some subband PMI information. CSI part 1 and CSI part 2 are separately encoded.

[0046] In Rel. 15 NR, a UE is configured by higher layers with N (N > 1) CSI report settings and M (M > 1) resource settings. For example, a CSI report setting (CSI-ReportConfig) contains resourcesForChannelMeasurement, csi-IM-ResourceForInterference, nzp-CSI-RS-ResourceForInterference, reportQuantity, etc. Each of resourcesForChannelMeasurement, csi-IM-ResourceForInterference, nzp-CSI-RS-ResourceForInterference is associated with a CSI resource setting (CSI-ResourceConfig, CSI-ResourceConfigId). A CSI resource setting contains a list of CSI-RS resource sets (csi-RS-ResourceSetList, e.g., NZP CSI-RS resource sets or CSI-IM resource sets).

[0047] If interference measurement is performed in CSI-IM, each CSI-RS resource for channel measurement is associated with a CSI-IM resource in the order of CSI-RS resources within the corresponding resource set and CSI-IM resources. The number of CSI-RS resources for channel measurement is equal to the number of CSI-IM resources.

[0048] That is, channel measurement resources (CMR) and interference measurement resources (IMR) are 1-to-1 mapping with respect to interference measurement based on CSI-IM.

[0049] If a UE is configured with a CSI report setting with reportQuantity (higher layer parameter reportQuantity) set to 'cri-RSRP', 'cri-RI-PMI-CQI', 'cri-RI-i1', 'cri-RI-i1-CQI', 'cri-RI-CQI', or 'cri-RI-LI-PMI-CQI', and K S (K SIn a case where one resource is reported, the UE derives CSI parameters other than the CRI as a condition to be reported. CSI k (k ≥ 0) is associated with the (k+1)th entry of the NZP CSI-RS resource (nzp-CSI-RSResource) within the corresponding NZP CSI-RS resource set (nzp-CSI-RS-ResourceSet) for channel measurement, and the (k+1)th entry of the CSI-IM resource (csi-IM-Resource) within the CSI-IM resource set (csi-IM-ResourceSet) if it is configured.

[0050] That is, CSI k corresponds to the (k+1)th CMR configured and the (k+1)th IMR configured.

[0051] In Rel. 16, for L1-SINR, both zero power (ZP) CSI-RS and NZP CSI-RS can be used in interference measurement. However, it is not clear whether the interference is measured as such.

[0052] It is being studied that, with respect to the CMR and the IMR configured in the case of a dedicated IMR, in the case of calculating L1-SINR, the numerator is the signal power measured on the CMR, and the denominator (interference and noise) is the total received power on the associated IMR.

[0053] The IMR can be a ZP CSI-RS or a NZP CSI-RS. In the existing specification, in the case where a CSI signal-to-noise and interference ratio (CSI-SINR, SINR based on CSI-RS) is used for L1-SINR reporting, the CSI-SINR is defined as a linear average of the power contribution [W] of the noise and interference divided by the linear average of the power contribution [W] across the resource elements (REs) carrying the CSI reference signal, and the interference and noise are measured across the resources indicated by the higher layer. However, the interference and noise are not clear.

[0054] For ZP-IMR, the total received power on the ZP-IMR is assumed as the interference and noise.

[0055] For NZP-IMR, the signal power measured on the corresponding NZP-IMR can be assumed as interference and noise, and the sum of the "signal power measured on the corresponding NZP-IMR" and the "residual power measured on the NZP-IMR" can also be assumed as interference and noise.

[0056] Therefore, it is being studied to set the interference and noise as the total received power on the resource associated by the indication by the higher layer. However, this definition is sometimes different from the definition in other operations.

[0057] For example, it is being studied that, for L1-SINR, the interference is the total received power on the IMR (ZP-IMR or NZP-IMR). On the other hand, in non-L1-SINR measurement for NZP-IMR (for example, existing (Layer 3 (L3)-) SINR measurement for CSI / CQI), the interference is the measured signal strength on the NZP-IMR. This interference is different from the interference for L1-SINR.

[0058] In addition, in the case where a synchronization signal signal-to-noise and interference ratio (SS-SINR, SS-based SINR) is used for L1-SINR reporting, the SS-SINR is defined as the linear average of the power contribution [W] across the REs carrying the secondary synchronization signal (SSS) divided by the linear average of the power contribution [W] of the noise and interference, which is measured across the resource indicated by the higher layer. However, the interference and noise are not clear.

[0059] If the interference measurement is not clear, there is a concern that it leads to a decrease in throughput and a decrease in system performance.

[0060] Therefore, the inventors of the present application conceived a method of appropriately measuring SINR.

[0061] Hereinafter, the embodiments related to the present disclosure will be described in detail with reference to the accompanying drawings. The wireless communication method related to each embodiment can be applied individually or in combination.

[0062] In the present disclosure, "A / B", "at least one of A and B" can be replaced with each other. In the present disclosure, a cell, a CC, a carrier, a BWP, a band can be replaced with each other. In the present disclosure, an index, an ID, an indicator, a resource ID can be replaced with each other. In the present disclosure, an RRC parameter, a higher layer parameter, an RRC information element (IE), an RRC message can be replaced with each other.

[0063] In the present disclosure, a CSI-RS, an NZP CSI-RS, a TRS, a CSI-RS for tracking, a CSI-RS with TRS information (a higher layer parameter trs-Info), an NZP CSI-RS resource within a NZP CSI-RS resource set with TRS information, a repetition CSI-RS, a CSI-RS configured with repetition (a higher layer parameter repetition), a CSI-RS with repetition, an NZP CSI-RS resource within a NZP CSI-RS resource set with repetition can be replaced with each other.

[0064] In the present disclosure, an SS / PBCH block, an SSB, an SS, an SSS can be replaced with each other.

[0065] (Wireless communication method)

[0066] Interference measurement in measurement of a signal based on any one of a CSI-RS and an SS / PBCH block (L1-SINR measurement, non-L1-SINR measurement, CSI measurement) is described.

[0067] <First embodiment>

[0068] CSI-SINR can be defined as a linear average of a power contribution [W] of a CSI reference signal divided by a linear average of a power contribution [W] of noise and interference (may be obtained by dividing a linear average of a power contribution [W] of a CSI reference signal by a linear average of a power contribution [W] of noise and interference). If CSI-SINR is used for L1-SINR reporting, the interference and the noise can be the total received power on the resources indicated by a higher layer and associated. In the case other than this, the interference and the noise can be measured throughout the resource elements (REs) carrying the CSI-RS within the same frequency bandwidth.

[0069] For CSI measurement other than L1-SINR measurement, the UE can assume at least one or all of the following assumptions 1 to 3.

[0070] [Assumption 1]

[0071] Each NZP CSI-RS port configured for interference measurement corresponds to an interference transmission layer.

[0072] [Scenario 2]

[0073] All interference transmission layers on the NZP CSI-RS ports used for interference measurement will be taken into account the associated energy per resource element (EPRE) ratios.

[0074] The EPRE ratio can also be set via the power offset (powerControlOffsetSS) configured through higher-level parameters (NZP-CSI-RS-Resource, CSI-ResourceConfig, NZP-CSI-RS-ResourceSet). This power offset can also be the ratio of the EPRE of the NZP CSI-RS to the EPRE of the SS / PBCH block (the power offset of the RE of the NZP CSI-RS to the RE of the SSS).

[0075] [Scenario 3]

[0076] Other interference signals on the resource elements (REs) of the NZP CSI-RS resource used for channel measurement, the NZP CSI-RS resource used for interference measurement, or the CSI-IM resource used for interference measurement.

[0077] like Figure 1 As shown, when the CSI measurement is an L1-SINR measurement (S10: "Yes"), the UE can also assume that the interference and noise in the L1-SINR measurement are the total received power on the resources that are indicated and associated by the higher layers (S20). When the CSI measurement is not an L1-SINR measurement (S10: "No"), the aforementioned assumptions 1 to 3 can also be assumed in the CSI measurement (S30).

[0078] According to this embodiment, interference in at least one of the L1-SINR measurement and CSI measurement can be appropriately measured.

[0079] <Second Implementation>

[0080] The SS-SINR can also be defined as a linear average of the power contribution [W] across the resource elements (REs) carrying the SSS divided by a linear average of the power contribution [W] of noise and interference (may also be obtained by dividing a linear average of the power contribution [W] across the resource elements (REs) carrying the SSS by a linear average of the power contribution [W] of noise and interference). If the SS-SINR is used in the case of L1-SINR reporting, the interference and noise can be either the total received power on the resources indicated by higher layers or the total received power on the resources indicated and associated by higher layers. In the case other than this, the interference and noise can also be measured across the resource elements (REs) carrying the SSS within the same frequency bandwidth.

[0081] For the determination of the SS-SINR, in addition to the SSS, a PBCH DMRS can also be used.

[0082] For the CSI measurement other than the L1-SINR measurement, the UE can also assume at least one or all of the assumptions 1 to 3 described in the first embodiment.

[0083] According to the present embodiment, it is possible to appropriately measure the interference in at least one of the L1-SINR measurement and the CSI measurement.

[0084] (Wireless communication system)

[0085] Hereinafter, a structure 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 one of the wireless communication methods according to the above-described embodiments of the present disclosure or a combination thereof.

[0086] Figure 2 is a diagram illustrating an example of a schematic structure of a wireless communication system according to an embodiment. The wireless communication system 1 can also be a system that realizes communication using Long Term Evolution (LTE) standardized by the Third Generation Partnership Project (3GPP), 5th generation mobile communication system New Radio (5G NR), or the like.

[0087] Furthermore, the wireless communication system 1 can also support dual connectivity between multiple radio access technologies (RATs) (Multi-RAT Dual Connectivity (MR-DC)). MR-DC can also include dual connectivity of LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity of NR and LTE (NR-E-UTRA Dual Connectivity (NE-DC)), and the like.

[0088] In EN-DC, a base station (eNB) of LTE (E-UTRA) is a master node (MN), and a base station (gNB) of NR is a secondary node (SN). In NE-DC, a base station (gNB) of NR is an MN, and a base station (eNB) of LTE (E-UTRA) is an SN.

[0089] The wireless communication system 1 can also support dual connectivity between multiple base stations within the same RAT (for example, dual connectivity of both an MN and an SN being base stations (gNBs) of NR (NR-NR Dual Connectivity (NN-DC), NR-NR Dual Connectivity)).

[0090] The wireless communication system 1 can also have a base station 11 that forms a macro cell C1 with a wide coverage, and base stations 12 (12a-12c) that are configured within the macro cell C1 and form small cells C2 that are narrower than the macro cell C1. The user terminal 20 can also be located within at least one cell. The configuration, number, and the like of the cells and the user terminal 20 are not limited to the manner shown in the figure. Hereinafter, without distinguishing between the base stations 11 and 12, the base stations 10 are collectively referred to.

[0091] The user terminal 20 can also be connected to at least one of the multiple base stations 10. The user terminal 20 can also use at least one of carrier aggregation (CA) using multiple component carriers (CCs) and dual connectivity (DC).

[0092] Each of the CCs can also be included in at least one of a first frequency band (Frequency Range 1 (FR1)) and a second frequency band (Frequency Range 2 (FR2)). The macro cell Cl can also be included in the FR1, and the small cell C2 can also be included in the FR2. For example, the FR1 can also be a sub-6 GHz band, and the FR2 can also be an above-24 GHz band. In addition, the frequency bands, definitions, and the like of the FR1 and the FR2 are not limited thereto, and the FR1 can also correspond to a higher frequency band than the FR2.

[0093] Furthermore, the user terminal 20 can also communicate in each of the CCs using at least one of Time Division Duplex (TDD) and Frequency Division Duplex (FDD).

[0094] The plurality of base stations 10 can also be connected through wired (for example, optical fiber based on Common Public Radio Interface (CPRI), X2 interface, or the like) or wireless (for example, NR communication). For example, when NR communication is utilized as a backhaul between the base stations 11 and 12, the base station 11 equivalent to an upper station can also be referred to as an Integrated Access Backhaul (IAB) donor, and the base station 12 equivalent to a relay station can also be referred to as an IAB node.

[0095] The base station 10 can also be connected to a core network 30 via another base station 10 or directly. The core network 30 can also include at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), a Next Generation Core (NGC), or the like, for example.

[0096] The user terminal 20 can also be a terminal supporting at least one of LTE, LTE-A, 5G, or the like.

[0097] In the wireless communication system 1, a wireless access scheme based on Orthogonal Frequency Division Multiplexing (OFDM) can also be used. For example, in at least one of Downlink (DL) and 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), and the like can also be used.

[0098] The wireless access scheme can also be referred to as a waveform. In addition, in the wireless communication system 1, other wireless access schemes (for example, other single carrier transmission schemes, other multicarrier transmission schemes) can also be applied to the wireless access schemes in UL and DL.

[0099] In the wireless communication system 1, as a downlink channel, a downlink shared channel (Physical Downlink Shared Channel (PDSCH)), a broadcast channel (Physical Broadcast Channel (PBCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), and the like, which are shared among the user terminals 20, can also be used.

[0100] Furthermore, in the wireless communication system 1, as an uplink channel, an uplink shared channel (Physical Uplink Shared Channel (PUSCH)), an uplink control channel (Physical Uplink Control Channel (PUCCH)), a random access channel (Physical Random Access Channel (PRACH)), and the like, which are shared among the user terminals 20, can also be used.

[0101] User data, higher layer control information, system information blocks (SIBs), and the like are transmitted through the PDSCH. User data, higher layer control information, and the like can also be transmitted through the PUSCH. Further, a master information block (MIB) can also be transmitted through the PBCH.

[0102] Lower layer control information can also be transmitted through the PDCCH. The lower layer control information can also include, for example, downlink control information (DCI) that contains scheduling information of at least one of the PDSCH and the PUSCH.

[0103] In addition, the DCI that schedules the PDSCH can also be referred to as a DL assignment, a DL DCI, or the like, and the DCI that schedules the PUSCH can also be referred to as an UL grant, an UL DCI, or the like. In addition, the PDSCH can also be interpreted as DL data, and the PUSCH can also be interpreted as UL data.

[0104] In the detection of the PDCCH, a control resource set (CORESET) and a search space can also be utilized. The CORESET corresponds to a resource in which the DCI is searched for. The search space corresponds to a search area and a search method of PDCCH candidates. One CORESET can also be associated with one or a plurality of search spaces. The UE can monitor the CORESET associated with a certain search space based on a search space configuration.

[0105] One search space can also correspond to PDCCH candidates that match one or a plurality of aggregation levels. One or a plurality of search spaces can also be referred to as a search space set. In addition, the "search space", "search space set", "search space configuration", "search space set configuration", "CORESET", "CORESET configuration", and the like of the present disclosure can also be replaced with each other.

[0106] The uplink control information (Uplink Control Information (UCI)) including at least one of channel state information (Channel State Information (CSI)), delivery acknowledgement information (for example, also referred to as Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK / NACK, and the like), a scheduling request (Scheduling Request (SR)) can also be transmitted through the PUCCH. A random access preamble for establishing a connection with a cell can also be transmitted through the PRACH.

[0107] In addition, in the present disclosure, downlink, uplink, and the like can also be described without "link". Furthermore, it can also be described without "Physical" at the beginning of various channels.

[0108] In the wireless communication system 1, a synchronization signal (Synchronization Signal (SS)), a downlink reference signal (Downlink Reference Signal (DL-RS)), and the like can also be transmitted. In the wireless communication system 1, as the DL-RS, 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)), and the like can also be transmitted.

[0109] The synchronization signal can be at least one of, for example, a primary synchronization signal (Primary Synchronization Signal (PSS)) and a secondary synchronization signal (Secondary Synchronization Signal (SSS)). A signal block including the SS (PSS, SSS) and the PBCH (and the DMRS for the PBCH) can also be referred to as an SS / PBCH block, an SS block (SS Block (SSB)), and the like. In addition, the SS, the SSB, and the like can also be referred to as a reference signal.

[0110] Furthermore, in the wireless communication system 1, as the uplink reference signal (Uplink Reference Signal (UL-RS)), a measurement reference signal (Sounding Reference Signal (SRS)), a demodulation reference signal (DMRS), and the like can also be transmitted. In addition, the DMRS can also be referred to as a user terminal-specific reference signal (UE-specific Reference Signal).

[0111] (Base station)

[0112] Figure 3 is a diagram that shows an example of the structure of a base station according to an embodiment. The base station 10 is provided with a control unit 110, a transmission / reception unit 120, a transmission / reception antenna 130, and a transmission path interface (transmission line interface) 140. In addition, the control unit 110, the transmission / reception unit 120, and the transmission / reception antenna 130, and the transmission path interface 140 can each be provided with one or more.

[0113] In addition, in this example, the functional blocks of the characteristic portions in the present embodiment are mainly shown, and it can also be assumed that the base station 10 has other functional blocks required for wireless communication. A part of the processing of each unit described below can also be omitted.

[0114] The control unit 110 implements the control of the entire base station 10. The control unit 110 can be constituted by a controller, a control circuit, or the like based on common knowledge in the technical field to which the present disclosure pertains.

[0115] The control unit 110 can also control the generation, scheduling (for example, resource allocation, mapping), and the like of signals. The control unit 110 can also control the transmission / reception, measurement, and the like using the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission path interface 140. The control unit 110 can also generate data, control information, a sequence, and the like transmitted as signals, and forward them to the transmission / reception unit 120. The control unit 110 can also perform call processing (setting, release, and the like) of a communication channel, state management of the base station 10, management of wireless resources, and the like.

[0116] The transmission / reception unit 120 can also include a baseband unit 121, a radio frequency (RF) unit 122, a measurement unit 123. The baseband unit 121 can also include a transmission processing unit 1211 and a reception processing unit 1212. The transmission / reception unit 120 can be constituted by a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmission / reception circuit, and the like, which can be explained based on common knowledge in the technical field to which the present disclosure pertains.

[0117] The transmission / reception unit 120 can be constituted as an integrated transmission / reception unit, or can be constituted by a transmission unit and a reception unit. The transmission unit can be constituted by the transmission processing unit 1211 and the RF unit 122. The reception unit can be constituted by the reception processing unit 1212, the RF unit 122, and the measurement unit 123.

[0118] The transmission / reception antenna 130 can be constituted by an antenna, for example, an array antenna, and the like, which can be explained based on common knowledge in the technical field to which the present disclosure pertains.

[0119] The transmission / reception unit 120 can also transmit the downlink channel, the synchronization signal, the downlink reference signal, and the like described above. The transmission / reception unit 120 can also receive the uplink channel, the uplink reference signal, and the like described above.

[0120] The transmission / reception unit 120 can also use digital beamforming (for example, precoding), analog beamforming (for example, phase rotation), and the like, to form at least one of a transmission beam and a reception beam.

[0121] The transmission / reception unit 120 (transmission processing unit 1211) can also, for example, generate a bit string to be transmitted, by performing processing of a Packet Data Convergence Protocol (PDCP) layer, processing of a Radio Link Control (RLC) layer (for example, RLC retransmission control), processing of a Medium Access Control (MAC) layer (for example, HARQ retransmission control), and the like, with respect to data, control information, and the like acquired from the control unit 110.

[0122] The transmission / reception unit 120 (transmission processing unit 1211) can also perform transmission processing such as channel coding (which can include error correction coding), modulation, mapping, filtering processing, Discrete Fourier Transform (DFT) processing (as necessary), Inverse Fast Fourier Transform (IFFT) processing, precoding, digital-analog conversion, and the like on the bit string to be transmitted, and output a baseband signal.

[0123] The transmission / reception unit 120 (RF unit 122) can also perform modulation to a radio frequency band, filtering processing, amplification, and the like on the baseband signal, and transmit a signal of the radio frequency band via the transmission / reception antenna 130.

[0124] On the other hand, the transmission / reception unit 120 (RF unit 122) can also perform amplification, filtering processing, demodulation to a baseband signal, and the like on a signal of the radio frequency band received by the transmission / reception antenna 130.

[0125] The transmission / reception unit 120 (reception processing unit 1212) can also apply reception processing such as analog-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (as necessary), filtering processing, demapping, demodulation, decoding (which can include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing, and the like on the acquired baseband signal, and acquire user data and the like.

[0126] The transmission / reception unit 120 (measurement unit 123) can also perform measurements related to a received signal. For example, the measurement unit 123 can also perform Radio Resource Management (RRM) measurements, Channel State Information (CSI) measurements, and the like, based on a received signal. The measurement unit 123 can also perform measurements with respect to received power (e.g., Reference Signal Received Power (RSRP)), received quality (e.g., Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR)), signal strength (e.g., Received Signal Strength Indicator (RSSI)), propagation path information (e.g., CSI), and the like. The measurement results can also be output to the control unit 110.

[0127] The transmission path interface 140 can also transmit and receive signals (backhaul signaling) between devices included in the core network 30, other base stations 10, and the like, and can also acquire, transmit, and the like, user data (user plane data), control plane data, and the like, for the user terminal 20.

[0128] In addition, the transmission unit and the reception unit of the base station 10 in the present disclosure can also be constituted by at least one of the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission path interface 140.

[0129] The transmission / reception unit 120 can also transmit any one of a Secondary Synchronization Signal (SSS) and a Channel State Information (CSI)-Reference Signal (RS). The transmission / reception unit 120 can also receive a report of a Layer 1 (L1)-Signal to Interference plus Noise Ratio (SINR) based on the signal. The L1-SINR can be obtained by dividing a linear average of power contributions of resources carrying the signal by a linear average of power contributions of noise and interference. The noise and interference can be total received power on resources indicated by a higher layer.

[0130] (User terminal)

[0131] Figure 4is 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 transmission / reception unit 220, and a transmission / reception antenna 230. Note that one or more of the control unit 210, the transmission / reception unit 220, and the transmission / reception antenna 230 can be provided.

[0132] Note that in this example, functional blocks that are characteristic of the present embodiment are mainly shown, and it is also conceivable that the user terminal 20 has other functional blocks necessary for wireless communication. Part of the processing of each unit described below can also be omitted.

[0133] The control unit 210 performs control of the entire user terminal 20. The control unit 210 can be configured by a controller, a control circuit, or the like described based on common knowledge in the technical field to which the present disclosure pertains.

[0134] The control unit 210 can also control generation, mapping, and the like of signals. The control unit 210 can also control transmission / reception, measurement, and the like using the transmission / reception unit 220 and the transmission / reception antenna 230. The control unit 210 can also generate data, control information, sequences, and the like transmitted as signals, and forward them to the transmission / reception unit 220.

[0135] The transmission / reception unit 220 can include a baseband unit 221, an RF unit 222, a measurement unit 223. The baseband unit 221 can include a transmission processing unit 2211, a reception processing unit 2212. The transmission / reception unit 220 can be configured by a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmission / reception circuit, and the like described based on common knowledge in the technical field to which the present disclosure pertains.

[0136] The transmission / reception unit 220 can be configured as an integrated transmission / reception unit, or can be configured by a transmission unit and a reception unit. The transmission unit can be configured by the transmission processing unit 2211 and the RF unit 222. The reception unit can be configured by the reception processing unit 2212, the RF unit 222, and the measurement unit 223.

[0137] The transmission / reception antenna 230 can be configured by an antenna, for example, an array antenna, and the like described based on common knowledge in the technical field to which the present disclosure pertains.

[0138] The transmission / reception unit 220 can receive the downlink channel, the synchronization signal, the downlink reference signal, and the like described above. The transmission / reception unit 220 can transmit the uplink channel, the uplink reference signal, and the like described above.

[0139] The transmission / reception unit 220 can also use digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), or the like to form at least one of a transmission beam and a reception beam.

[0140] The transmission / reception unit 220 (transmission processing unit 2211) can also perform, for example, PDCP layer processing, RLC layer processing (e.g., RLC retransmission control), MAC layer processing (e.g., HARQ retransmission control), or the like, on data, control information, or the like acquired from the control unit 210, to generate a bit string to be transmitted.

[0141] The transmission / reception unit 220 (transmission processing unit 2211) can also perform channel coding (which can include error correction coding), modulation, mapping, filtering processing, DFT processing (as necessary), IFFT processing, precoding, digital-analog conversion, or the like, on the bit string to be transmitted, to output a baseband signal.

[0142] In addition, whether or not to apply DFT processing can also be based on the setting of transform precoding. For a certain channel (e.g., PUSCH), in a case where transform precoding is activated (enabled), the transmission / reception unit 220 (transmission processing unit 2211) can also perform DFT processing as the above-described transmission processing in order to transmit the channel using a DFT-s-OFDM waveform, and in a case where this is not so, the transmission / reception unit 220 (transmission processing unit 2211) can also not perform DFT processing as the above-described transmission processing.

[0143] The transmission / reception unit 220 (RF unit 222) can also perform modulation to a radio frequency band, filtering processing, amplification, or the like, on the baseband signal, to transmit a signal of the radio frequency band via the transmission / reception antenna 230.

[0144] On the other hand, the transmission / reception unit 220 (RF unit 222) can also perform amplification, filtering processing, demodulation to a baseband signal, or the like, on a signal of the radio frequency band received by the transmission / reception antenna 230.

[0145] The transmission / reception unit 220 (reception processing unit 2212) can also apply analog-digital conversion, FFT processing, IDFT processing (as necessary), filtering processing, demapping, demodulation, decoding (which can include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing, or the like, to the acquired baseband signal, to acquire user data or the like.

[0146] The transmission / reception unit 220 (measurement unit 223) can also perform a measurement related to a received signal. For example, the measurement unit 223 can also perform RRM measurement, CSI measurement, and the like, based on a received signal. The measurement unit 223 can also measure a reception power (for example, RSRP), a reception quality (for example, RSRQ, SINR, SNR), a signal strength (for example, RSSI), propagation path information (for example, CSI), and the like. The measurement result can also be output to the control unit 210.

[0147] In addition, the transmission unit and the reception unit of the user terminal 20 in the present disclosure can also be constituted by at least one of the transmission / reception unit 220 and the transmission / reception antenna 230.

[0148] The transmission / reception unit 220 can also receive any one of a secondary synchronization signal (SSS) and a channel state information-reference signal (CSI-RS). The control unit 210 can also measure a layer 1-signal to interference plus noise ratio (L1-SINR) from the signal. The L1-SINR can also be obtained by dividing a linear average of a power contribution of a resource element on which the signal is carried by a linear average of a power contribution of noise and interference. The noise and the interference can be a total received power on a resource indicated by a higher layer.

[0149] For a CSI measurement other than measurement of the L1-SINR, each non-zero power CSI-RS port (NZP CSI-RS port) configured for interference measurement can correspond to one interference transmission layer. For a CSI measurement other than the L1-SINR, all interference measurement layers on the NZP CSI-RS port for interference measurement can take an energy per resource element (EPRE) ratio into account.

[0150] For a CSI measurement other than measurement of the L1-SINR, the control unit can also assume other interference signals on a resource element of a NZP CSI-RS resource for channel measurement, a NZP CSI-RS resource for interference measurement, or a CSI-interference measurement resource (CSI-IM resource) for interference measurement.

[0151] The resource can be associated with the signal.

[0152] (Hardware structure)

[0153] Further, the block diagrams used in the description of the above-described embodiments show blocks of functional units. These functional blocks (structural units) are realized by any combination of hardware and software, and the method of realizing the functional blocks is not particularly limited. That is, each functional block can be realized by one device physically or logically integrated, or by two or more devices directly or indirectly (for example, by wire, wireless, or the like) connected. The functional blocks can also be realized by combining the above-described one device or the above-described multiple devices with software.

[0154] Here, in the functions, there are judgment, decision, determination, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, election, establishment, comparison, assumption, expectation, consideration, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, and the like, but are not limited to these. For example, a functional block (structural unit) that realizes a transmission function can also be referred to as a transmitting unit, a transmitter, or the like. Any one of these is as described above, and the method of realization is not particularly limited.

[0155] For example, the base station, the user terminal, and the like in one embodiment of the present disclosure can also function as a computer that performs processing of the wireless communication method of the present disclosure. Figure 5 is a diagram that shows an example of a hardware structure of the base station and the user terminal according to one embodiment. The base station 10 and the user terminal 20 described above can also be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like.

[0156] Further, in the present disclosure, the terms of device, circuit, equipment, section, unit, and the like can be replaced with each other. The hardware structure of the base station 10 and the user terminal 20 can be configured to include one or more of each device shown in the diagram, or can be configured not to include a part of the devices.

[0157] For example, the processor 1001 is only illustrated one, but there can be a plurality of processors. Furthermore, the processing can be executed by one processor, or can be executed by two or more processors simultaneously, sequentially, or with other methods. In addition, the processor 1001 can be realized by one or more chips.

[0158] As for each function in the base station 10 and the user terminal 20, at least one of the operation by the processor 1001 and the control of the communication via the communication device 1004, or the control of the readout and the writing of the data in the memory 1002 and the storage 1003 is realized, for example, by reading a specific software (program) into the hardware such as the processor 1001, the memory 1002, and the like, and thereby performing the operation and the control by the processor 1001.

[0159] The processor 1001 causes, for example, an operation system to operate to control the entire computer. The processor 1001 can also be constituted by a central processing device (Central Processing Unit (CPU)) including an interface with a peripheral device, a control device, an arithmetic device, a register, and the like. For example, at least a part of the above-described control unit 110 (210), the transmission-reception unit 120 (220), and the like can also be realized by the processor 1001.

[0160] Furthermore, the processor 1001 reads out a program (program code), a software module, data, and the like from at least one of the storage 1003 and the communication device 1004 to the memory 1002, and performs various processing according to them. As the program, a program that causes a computer to execute at least a part of the operations described in the above-described embodiments can be used. For example, the control unit 110 (210) can also be realized by a control program stored in the memory 1002 and operated in the processor 1001, and the same can be applied to other functional blocks.

[0161] The memory 1002 can also be a computer-readable recording medium, for example, constituted by at least one of a Read Only Memory (ROM), an Erasable Programmable ROM (EPROM), an Electrically EPROM (EEPROM), a Random Access Memory (RAM), other appropriate storage medium. The memory 1002 can also be referred to as a register, a cache, a main storage (main storage device), and the like. The memory 1002 can hold a program (program code), a software module, and the like that can be executed in order to implement the wireless communication method related to one embodiment of the present disclosure.

[0162] The storage 1003 can also be a computer-readable recording medium such as at least one of a flexible disc, a floppy (registered trademark) disc, a magneto-optical disc (e.g., a compact disc read-only memory (CD-ROM) and the like), a digital versatile disc, a Blu-ray (registered trademark) disc, a removable disc, a hard disc drive, a smart card, a flash memory device (e.g., a card, a stick, a key drive), a magnetic stripe, a database, a server, and the like. The storage 1003 can also be referred to as an auxiliary storage device.

[0163] The communication device 1004 is hardware (a transceiver device) for performing communication between computers via at least one of a wired network and a wireless network, also referred to as a network device, a network controller, a network card, a communication module, and the like. The communication device 1004 can also be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, and the like in order to implement at least one of Frequency Division Duplex (FDD) and Time Division Duplex (TDD). The above-described transceiver 120 (220), a transceiver antenna 130 (230), and the like can also be implemented by the communication device 1004. The transceiver 120 (220) can also be installed physically or logically separately by a transmission unit 120a (220a) and a reception unit 120b (220b).

[0164] The input device 1005 is an input device (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, and the like) that receives an input from an outside. The output device 1006 is an output device (e.g., a display, a speaker, a Light Emitting Diode (LED) lamp, and the like) that performs an output to an outside. In addition, the input device 1005 and the output device 1006 can also be a structure that is integrated (e.g., a touch panel).

[0165] Furthermore, the processor 1001, the memory 1002, and the like are connected through a bus 1007 for communicating information. The bus 1007 can be configured with a single bus, or different buses among the devices.

[0166] Furthermore, the base station 10 and the user terminal 20 can also be configured to include a microprocessor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Programmable Logic Device (PLD), a Field Programmable Gate Array (FPGA), and the like hardware, and a part or all of the functional blocks can also be implemented with the hardware. For example, the processor 1001 can also be implemented with at least one of these hardware.

[0167] (Modified example)

[0168] In addition, the terms described in the present disclosure and the terms necessary for understanding the present disclosure can also be replaced with terms having the same or similar meanings. For example, a channel, a symbol, and a signal (a signal or signaling) can also be replaced with each other. In addition, a signal can also be a message. A Reference Signal (RS) can also be simply referred to as RS, and can also be referred to as a Pilot, a Pilot signal, and the like depending on the applied standard. In addition, a Component Carrier (CC) can also be referred to as a cell, a frequency carrier, a carrier frequency, and the like.

[0169] A radio frame can also be configured of one or a plurality of periods (frames) in the time domain. Each period (frame) of the one or a plurality of periods (frames) configuring the radio frame can also be referred to as a subframe. Further, a subframe can also be configured of one or a plurality of slots in the time domain. A subframe can also be a fixed time length (for example, 1 ms) independent of numerology.

[0170] Here, numerology can also refer to a communication parameter applied in at least one of transmission and reception of a certain signal or channel. For example, numerology can also indicate at least one of a SubCarrier Spacing (SCS), a bandwidth, a symbol length, a cyclic prefix length, a Transmission Time Interval (TTI), a number of symbols per TTI, a radio frame structure, a specific filtering processing performed by a transmitter-receiver in the frequency domain, a specific windowing processing performed by the transmitter-receiver in the time domain, and the like.

[0171] A slot can also be composed of one or a plurality of symbols (Orthogonal Frequency Division Multiplexing (OFDM) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, and the like) in the time domain. In addition, a slot can also be a time unit based on a numerology.

[0172] A slot can also include a plurality of mini-slots. Each mini-slot can also be composed of one or a plurality of symbols in the time domain. In addition, a mini-slot can also be referred to as a sub-slot. A mini-slot can also be composed of a smaller number of symbols than a slot. A PDSCH (or PUSCH) transmitted in a larger time unit than a mini-slot can also be referred to as PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot can also be referred to as PDSCH (PUSCH) mapping type B.

[0173] A radio frame, a subframe, a slot, a mini-slot, and a symbol each represent a time unit for transmitting a signal. A radio frame, a subframe, a slot, a mini-slot, and a symbol can also be referred to by other names respectively corresponding thereto. In addition, a time unit in the disclosure, such as a frame, a subframe, a slot, a mini-slot, a symbol, and the like, can be replaced with each other.

[0174] For example, one subframe can also be referred to as a TTI, a plurality of consecutive subframes can also be referred to as a TTI, one slot or one mini-slot can also be referred to as a TTI. That is, at least one of a subframe and a TTI can be a subframe (1 ms) in the existing LTE, can be a period shorter than 1 ms (for example, 1-13 symbols), or can be a period longer than 1 ms. In addition, a unit representing a TTI can not be referred to as a subframe, but can be referred to as a slot, a mini-slot, or the like.

[0175] Here, a TTI, for example, refers to a minimum time unit of scheduling in wireless communication. For example, in an LTE system, a base station performs scheduling in which a radio resource (a frequency bandwidth, a transmission power, and the like that can be used in each user terminal) is allocated to each user terminal in a TTI unit. In addition, the definition of a TTI is not limited thereto.

[0176] A TTI can also be a transmission time unit of a data packet (a transport block), a code block, a codeword, or the like that has been channel-encoded, and can also become a processing unit of scheduling, link adaptation, or the like. In addition, when a TTI is given, a time interval (for example, a number of symbols) to which a transport block, a code block, a codeword, or the like is actually mapped can be shorter than the TTI.

[0177] In addition, in a case where one slot or one mini-slot is referred to as a TTI, one or more TTIs (i.e., one or more slots or one or more mini-slots) can also be a minimum time unit of scheduling. In addition, the number of slots (mini-slots) constituting the minimum time unit of scheduling can also be controlled.

[0178] A TTI having a time length of 1 ms can 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 slot, etc. A TTI shorter than the normal TTI can also be referred to as a shortened TTI, a short TTI, a partial or fractional TTI, a shortened subframe, a short subframe, a mini-slot, a sub-slot, a slot, etc.

[0179] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) can also be interpreted as a TTI having a time length of more than 1 ms, and a short TTI (e.g., a shortened TTI, etc.) can also be interpreted as a TTI having a TTI length less than that of a long TTI and a TTI length of 1 ms or more.

[0180] A resource block (RB) is a resource allocation unit in a time domain and a frequency domain, and can also include one or more contiguous subcarriers (subcarriers) in the frequency domain. The number of subcarriers included in an RB can also be the same regardless of numerologies, for example, 12. The number of subcarriers included in an RB can also be determined based on numerologies.

[0181] In addition, an RB can also include one or more symbols in a time domain, and can also be a length of one slot, one mini-slot, one subframe, or one TTI. One TTI, one subframe, etc. can also be constituted by one or more resource blocks, respectively.

[0182] In addition, one or more RBs can also be referred to as a physical RB (PRB), a subcarrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, etc.

[0183] In addition, a resource block can also be constituted by one or more resource elements (REs). For example, one RE can also be a wireless resource area of one subcarrier and one symbol.

[0184] The Bandwidth Part (BWP) (also referred to as partial bandwidth, etc.) can also represent a subset of consecutive common resource blocks (RBs) used for a certain parameter set in a carrier. Here, common RBs can also be determined by indexing RBs based on a common reference point of the carrier. PRBs can also be defined in a BWP and appended with numbers within that BWP.

[0185] A BWP can also include a UL BWP (BWP used by UL) and a DL BWP (BWP used by DL). For a UE, one or more BWPs can be set within a single carrier.

[0186] At least one of the configured BWPs can be active, and the UE may not intend to transmit or receive specific signals / channels outside of the active BWPs. Furthermore, the terms "cell," "carrier," etc., used in this disclosure can also be interpreted as "BWP."

[0187] Furthermore, the structures described above, such as radio frames, subframes, time slots, mini-time slots, and symbols, are merely illustrative. For example, the number of subframes contained in a radio frame, the number of time slots in each subframe or radio frame, the number of mini-time slots contained within a time slot, the number of symbols and RBs contained in a time slot or mini-time slot, the number of subcarriers contained in an RB, and the number of symbols in a TTI, symbol length, and cyclic prefix (CP) length can be varied in many ways.

[0188] Furthermore, the information, parameters, etc., described in this disclosure can be represented by absolute values, relative values ​​with respect to a specific value, or other corresponding information. For example, wireless resources can also be indicated by a specific index.

[0189] In this disclosure, the names used for parameters, etc., are not limiting names in any respect. Furthermore, the mathematical expressions, etc., using these parameters may differ from those explicitly disclosed in this disclosure. Various channels (PUCCH, PDCCH, etc.) and information elements can be identified by any suitable name; therefore, the various names assigned to these various channels and information elements are not limiting names in any respect.

[0190] The information, signals, etc., described in this disclosure can also be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc., which may be mentioned throughout the above description, can also be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any combination thereof.

[0191] Furthermore, information, a signal, and the like can be output to at least one of a higher layer (upper layer) and a lower layer from the lower layer and a higher layer. Information, a signal, and the like can be input and output via a plurality of network nodes.

[0192] Information, a signal, and the like that are input and output can be saved in a specific location (for example, a memory) and can be managed using a management table. Information, a signal, and the like that are input and output can be overwritten, updated, or added. Information, a signal, and the like that are output can be deleted. Information, a signal, and the like that are input can be transmitted to another device.

[0193] The notification of information is not limited to the manner / embodiment described in the present disclosure and can be performed using another method. For example, the notification of information in the present disclosure can also be implemented by physical layer signaling (for example, downlink control information (Downlink Control Information (DCI)), uplink control information (Uplink Control Information (UCI))), high layer signaling (for example, Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB), and the like), Medium Access Control (MAC) signaling), other signals, or a combination thereof.

[0194] In addition, the physical layer signaling can also be referred to as Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signal), L1 control information (L1 control signal), and the like. Furthermore, the RRC signaling can also be referred to as an RRC message, for example, can also be an RRC connection setup message, an RRC connection reconfiguration message, and the like. Furthermore, the MAC signaling can also be notified using a MAC control element (MAC Control Element (CE)), for example.

[0195] Furthermore, the notification of specific information (for example, the notification of "X is") is not limited to explicit notification and can be performed implicitly (for example, by not performing the notification of the specific information or by the notification of other information).

[0196] The determination can be made by a value represented by one 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).

[0197] Software, regardless of being referred to as software, firmware, middle-ware, micro-code, hardware description language, or by other names, should be broadly interpreted as meaning instructions, instruction sets, code, code segments, program code, programs, sub-programs, software modules, applications, software applications, software packages, routines, sub-routines, objects, executable files, execution threads, procedures, functions, and the like.

[0198] Furthermore, software, instructions, information, and the like can also be transmitted and received via a transmission medium. For example, in the case where software is transmitted from a website, a server, or other remote source using at least one of wired technologies (coaxial cable, optical fiber cable, twisted pair cable, Digital Subscriber Line (DSL), and the like) and wireless technologies (infrared rays, microwaves, and the like), at least one of these wired technologies and wireless technologies is included in the definition of the transmission medium.

[0199] The terms "system" and "network" used in the present disclosure can be used interchangeably. The "network" can also mean a device (for example, a base station) included in the network.

[0200] In the present disclosure, the terms of “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”, “panel”, and the like can be used interchangeably.

[0201] In the present disclosure, the terms of “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”, “component carrier”, and the like can be used interchangeably. There is also a case where the base station is called with the terms of macro cell, small cell, femto cell, pico cell, and the like.

[0202] A base station can accommodate one or multiple (for example, three) cells. In the case where the base station accommodates multiple cells, the coverage area of the base station as a whole can be divided into multiple smaller areas, each of which can also be provided with a communication service by a base station subsystem (for example, a small base station for indoor use (Remote Radio Head (RRH))). The term of “cell” or “sector” refers to a part or the whole of the coverage area of at least one of the base station and the base station subsystem that provides a communication service within the coverage.

[0203] In the present disclosure, the terms of “Mobile Station (MS)”, “user terminal”, “User Equipment (UE)”, “terminal”, and the like can be used interchangeably.

[0204] In some cases, the mobile station is also referred to as a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communication device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a hand set, a user agent, a mobile client, a client, or by some other suitable terminology.

[0205] At least one of the base station and the mobile station can also be referred to as a transmission device, a reception device, a wireless communication device, or the like. In addition, at least one of the base station and the mobile station can also be a device mounted on a mobile body, a mobile body itself, or the like. The mobile body can be a vehicle (for example, a car, an airplane, or the like), can also be a mobile body that moves in an unmanned manner (for example, a drone, an automated driving vehicle, or the like), and can also be 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 while performing a communication operation. For example, at least one of the base station and the mobile station can also be a sensor or the like, an Internet of Things (IoT) device.

[0206] Furthermore, the base station in the present disclosure can also be interpreted as a user terminal. For example, for a structure in which communication between the base station and the user terminal is replaced with communication between a plurality of user terminals (for example, also referred to as Device-to-Device (D2D), Vehicle-to-Everything (V2X), or the like), each of the modes / embodiments of the present disclosure can also be applied. In this case, a structure in which the user terminal 20 has the functions of the base station 10 described above can also be provided. Furthermore, expressions such as "uplink" and "downlink" can also be interpreted as expressions corresponding to inter-terminal communication (for example, "side"). For example, an uplink channel, a downlink channel, or the like can also be interpreted as a side channel.

[0207] Likewise, the user terminal in the present disclosure can also be interpreted as a base station. In this case, a structure in which the base station 10 has the functions of the user terminal 20 described above can also be provided.

[0208] In the present disclosure, actions performed by a base station are sometimes also performed by its upper node depending on the situation. Obviously, in a network including one or more network nodes having a base station, various actions 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, consider a Mobility Management Entity (MME), a Serving-Gateway (S-GW), and the like, but not limited to these), or a combination thereof.

[0209] The modes / embodiments explained in the present disclosure can be used individually, or in combination, and can also be used in switching as execution proceeds. Furthermore, the processing procedures, sequences, flowcharts, and the like of the modes / embodiments explained in the present disclosure can also be changed in order as long as there is no contradiction. For example, for the methods explained in the present disclosure, the elements of various steps are prompted using the order of the examples, but are not limited to the specific order prompted.

[0210] The modes / embodiments explained in the present disclosure can 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 (5th generation mobile communication system (6G)), xth generation mobile communication system (xth generation mobile communication system (xG) (xG (x is an integer, a decimal number))), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), systems using other appropriate wireless communication methods, next-generation systems expanded based on them, and the like. In addition, a plurality of systems can also be combined (for example, LTE or LTE-A, in combination with 5G, and the like) to be applied.

[0211] The description "based on" used in the present disclosure does not mean "only based on" as long as it is not particularly written. In other words, the description "based on" means both "only based on" and "at least based on".

[0212] Any reference to an element or apparatus or article "using" another element or apparatus or article means that the element or apparatus or article is linked to or connected to the other element or apparatus or article.

[0213] The term "determining" as used in this disclosure can, in some circumstances and as appropriate, encompass a wide variety of actions. For example, "determining" can include "judging," "calculating," "computing," "processing," "deriving," "investigating," "looking up" (such as looking up in a table, a database or another data structure), "ascertaining" and the like.

[0214] Also, "determining" can also include "receiving," "transmitting," "inputting," "outputting," "accessing," "selecting," "choosing," "establishing," "comparing" and the like.

[0215] Also, "determining" can also include "receiving," "transmitting," "inputting," "outputting," "accessing," "selecting," "choosing," "establishing," "comparing" and the like.

[0216] Also, "determining" can also be interpreted as "assuming," "expecting," "considering" and the like.

[0217] The "maximum transmission power" recited in the present disclosure can mean a maximum value of the transmission power, can mean a nominal maximum transmission power (the nominal UE maximum transmit power), or can mean a rated maximum transmission power (the rated UE maximum transmit power).

[0218] The terms "connected," "coupled," and all variations thereof, as used in the present disclosure, mean all direct and indirect connections or couplings between two or more elements, and can include the existence of one or more intermediate elements between the two elements "connected" or "coupled" to each other. The coupling or connection between elements can be physical or logical, or a combination thereof. For example, "connected" can be interpreted as "accessed."

[0219] In the present disclosure, in the case of connecting two elements, it can be considered that one or more electric wires, cables, printed electric connections, and the like are used, and as several non-limiting and non-inclusive examples, electromagnetic energy having a wavelength in the radio frequency domain, the microwave region, the light (both visible and non-visible) region, and the like, are used to be "connected" or "coupled" to each other.

[0220] In the present disclosure, the term "A is different from B" can also mean "A and B are different from each other." In addition, the term can also mean "A and B are different from C, respectively." The terms "separated," "coupled," and the like can also be interpreted as "different" in the same manner.

[0221] In the present disclosure, in the case of using "include," "including," and variations thereof, these terms mean the same as the term "comprising" in the inclusive sense. Further, the term "or" used in the present disclosure does not mean the exclusive sense.

[0222] In the present disclosure, for example, in the case of adding an article by translation such as a, an, and the in English, the present disclosure can also include the case where the noun following the article is plural.

[0223] The application related to the present disclosure has been described in detail above, but it is apparent to those skilled in the art that the application related to the present disclosure is not limited to the embodiments described in the present disclosure. The application related to the present disclosure can be implemented as a modification and a change without departing from the spirit and scope of the application defined based on the recitations of the claims. Therefore, the recitations of the present disclosure are intended for the purpose of illustrative explanation, and do not have any limiting meaning on the application related to the present disclosure.

[0224] This application is based on Japanese Patent Application No. 2020-030454 filed on February 26, 2020. The content of the application is incorporated herein by reference in its entirety.

Claims

1. A terminal comprising: a receiving unit that receives a secondary synchronization signal (SSS); and a control unit that measures a layer 1-signal to interference plus noise ratio (Ll-SINR) from the SSS, the Ll-SINR is obtained by dividing a linear average of a contribution of a first power across resource elements carrying the SSS by a linear average of a contribution of a second power of noise and interference, the second power is a total received power on an interference measurement NZP CSI-RS resource indicated by a higher layer, for a CSI measurement other than the measurement of the Ll-SINR, each of a plurality of ports of the interference measurement NZP CSI-RS resource corresponds to one interference transmission layer, in the CSI measurement other than the measurement of the Ll-SINR, all interference measurement layers corresponding to the plurality of ports are associated with an energy per resource element (EPRE) ratio, for the CSI measurement other than the measurement of the Ll-SINR, the control unit assumes other interference signals on resource elements of a channel measurement NZP CSI-RS resource, the interference measurement NZP CSI-RS resource, or a CSI-interference measurement resource (CSI-IM resource) for interference measurement.

2. A wireless communication method for a terminal, the wireless communication method comprising: a step of receiving a secondary synchronization signal (SSS); and a step of measuring a layer 1-signal to interference plus noise ratio (Ll-SINR) from the SSS, the Ll-SINR is obtained by dividing a linear average of a contribution of a first power across resource elements carrying the SSS by a linear average of a contribution of a second power of noise and interference, the second power is a total received power on an interference measurement NZP CSI-RS resource indicated by a higher layer, for a CSI measurement other than the measurement of the Ll-SINR, each of a plurality of ports of the interference measurement NZP CSI-RS resource corresponds to one interference transmission layer, in the CSI measurement other than the measurement of the Ll-SINR, all interference measurement layers corresponding to the plurality of ports are associated with an energy per resource element (EPRE) ratio, for the CSI measurement other than the measurement of the Ll-SINR, other interference signals on resource elements of a channel measurement NZP CSI-RS resource, the interference measurement NZP CSI-RS resource, or a CSI-interference measurement resource (CSI-IM resource) for interference measurement are assumed.

3. A base station comprising: a transmitting unit that transmits a secondary synchronization signal (SSS); and a receiving unit that receives a report of a layer 1-signal to interference plus noise ratio (Ll-SINR) from the SSS, the Ll-SINR is obtained by dividing a linear average of a contribution of a first power across resource elements carrying the SSS by a linear average of a contribution of a second power of noise and interference, the second power is a total received power on an interference measurement NZP CSI-RS resource indicated by a higher layer, For the CSI measurement other than the measurement of the L1-SINR, each of a plurality of ports of the NZP CSI-RS resource for interference measurement corresponds to one interference transmission layer, In the CSI measurement other than the measurement of the L1-SINR, all of the interference measurement layers corresponding to the plurality of ports are associated with an energy per resource element (EPRE) ratio, For the CSI measurement other than the measurement of the L1-SINR, the control unit assumes other interference signals on resource elements of the NZP CSI-RS resource for channel measurement, the NZP CSI-RS resource for interference measurement, or a CSI- interference measurement resource (CSI-IM resource) for interference measurement.

4. A system including a terminal and a base station, wherein the terminal includes: a reception unit that receives a secondary synchronization signal (SSS); and a control unit that measures a layer 1-signal to interference plus noise ratio (L1-SINR) based on the SSS, the L1-SINR is obtained by dividing a linear average of a contribution of a first power across resource elements carrying the SSS by a linear average of a contribution of a second power of noise and interference, the second power is a total received power on a NZP CSI-RS resource for interference measurement indicated by a higher layer, For the CSI measurement other than the measurement of the L1-SINR, each of a plurality of ports of the NZP CSI-RS resource for interference measurement corresponds to one interference transmission layer, In the CSI measurement other than the measurement of the L1-SINR, all of the interference measurement layers corresponding to the plurality of ports are associated with an energy per resource element (EPRE) ratio, For the CSI measurement other than the measurement of the L1-SINR, the control unit assumes other interference signals on resource elements of the NZP CSI-RS resource for channel measurement, the NZP CSI-RS resource for interference measurement, or a CSI- interference measurement resource (CSI-IM resource) for interference measurement, the base station includes: a transmission unit that transmits the SSS; and a reception unit that receives a report of the L1-SINR based on the SSS.

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