Terminal, wireless communication method, and base station

Abstract

A terminal according to an aspect of the present disclosure includes: a receiving unit that receives setting information for using different channel state information (CSI)-reference signal (RS) sequences among a plurality of resources, where each of the plurality of resources is any one of a CSI-RS port, a code division multiplexing (CDM) group, and a cell; and a control unit that performs measurements using a plurality of CSI-RS sequences based on the setting information. According to an aspect of the present disclosure, the measurement accuracy of CSI-RS is improved.

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 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, etc. (Non-Patent Document 1). In addition, LTE-Advanced (3GPP Rel. 10-14) has been standardized for the purpose of further large capacity and high performance of LTE (Third Generation Partnership Project (3GPP) Release (Rel.) 8, 9).

[0003] Research is also being conducted on subsequent systems of LTE (for example, also referred to as the 5th generation mobile communication system (5G), 5G+ (plus), 6th generation mobile communication system (6G), New Radio (NR), 3GPP Rel. 15 and later, etc.).

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

[0005] Prior Art Documents

[0006] Non-Patent Documents

[0007] 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

[0008] Problems to be Solved by the Invention

[0009] In a wireless communication system (e.g., Rel. 15 NR), multiple channel state information (CSI)-reference signals (RSs) are multiplexed with each other using at least one of time division multiplexing (TDM), frequency division multiplexing (FDM), and code division multiplexing (CDM), and are transmitted separately using multiple CSI-RS ports.

[0010] However, considering the interference of multiple CSI-RSs transmitted in the same resource element (RE), the accuracy of measurement (estimation, tracking) will decrease. If the measurement accuracy of CSI-RS decreases, there is a concern that the system performance will degrade.

[0011] Therefore, one of the objectives of the present disclosure is to provide a terminal, a wireless communication method, and a base station that can improve the measurement accuracy of CSI-RS.

[0012] Means for Solving the Problems

[0013] A terminal according to one embodiment of the present disclosure includes: a receiving unit that receives setting information for using different channel state information (CSI)-reference signal (RS) sequences between multiple resources, where each of the multiple resources is any one of a CSI-RS port, a code division multiplexing (CDM) group, and a cell; and a control unit that performs measurement using multiple CSI-RS sequences based on the setting information.

[0014] Advantages of the Invention

[0015] According to one embodiment of the present disclosure, the measurement accuracy of CSI-RS is improved. Description of the Drawings

[0016] Figure 1 This is a diagram showing an example of the existing time slots and the CSI-RS positions within the RBs.

[0017] Figures 2A - 2D This is a diagram showing an example of FD-OCC and TD-OCC.

[0018] Figure 3 This is a diagram showing an example of the CSI-RS positions for each number of ports.

[0019] Figure 4 This is a diagram showing an example of the mapping of the 32-port CSI-RS.

[0020] Figure 5 This is a diagram showing an example of the CDM group.

[0021] Figure 6 This is a diagram showing an example of the time slots and the CSI-RS positions within the RBs.

[0022] Figure 7A And 7B is a diagram showing an example of the association between the PN sequence samples and the CDM group.

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

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

[0025] Figure 10 This is a diagram showing an example of the structure of the user terminal according to an embodiment.

[0026] Figure 11 This is a diagram showing an example of the hardware structure of the base station and the user terminal according to an embodiment. Detailed implementation manners

[0027] (CSI-RS)

[0028] In Rel.15, the CSI-RS of multiple ports is multiplexed using at least one of frequency division multiplexing (FDM), time division multiplexing (TDM), and code division multiplexing (CDM (frequency domain OCC (Orthogonal Cover Code), time domain OCC)). The CSI-RS supports a maximum of 32 ports.

[0029] CSI-RS for multiple ports is used for orthogonalization of, for example, a multi-input multi-output (MIMO) layer. For example, for single-user MIMO, different DMRS ports are set for each layer. For multi-user MIMO, different DMRS ports are set for each layer within one UE and for each UE.

[0030] In Rel.15, CSI-RS supports up to 32 ports through at least one of time-domain OCC, frequency-domain OCC (maximum 4 in the time direction and maximum 2 in the frequency direction), FDM, and TDM.

[0031] In Rel.15, as a DL RS for at least one of acquisition of channel state information (CSI), beam management (BM), beam failure recovery (BFR), and fine tracking of time and frequency, CSI-RS is used, for example. CSI-RS supports 1, 2, 4, 8, 12, 16, 24, 32 ports (antenna ports, CSI-RS ports). CSI-RS supports periodic, semi-persistent, and aperiodic transmissions. In order to adjust the overhead and CSI estimation accuracy, the frequency density of CSI-RS can be set.

[0032] Figure 1 It is a diagram showing an example of the CSI-RS position within a time slot. Each row of the table represents the row number, the number of ports, the density in the frequency domain, the CDM type, the time and frequency (time / frequency) position (the position (kbar, l bar) of the component resource (CDM group)), the CDM group index, and the position of each resource within the component resource ((RE, symbol), (k’, l’)). Here, the time / frequency position is the time and frequency resources (component resources) position of the CSI-RS corresponding to one port. k bar is a symbol with a bar on “k”. k bar represents the starting resource element (RE) index of the component resource, and l bar represents the starting symbol (OFDM symbol) index of the component resource.

[0033] As the CDM group, there are no CDM (no CDM, N / A), FD-CDM2, CDM4, and CDM8. FD-CDM2 multiplexes the CSI-RS of 2 ports (FD2) in the same time and frequency by multiplying the frequency-domain (FD)-orthogonal cover code (OCC) of length 2 by the RE unit. CDM4 multiplexes the CSI-RS of 4 ports (FD2TD2) in the same time and frequency by multiplying the FD-OCC of length 2 and the time-domain (TD)-OCC of length 2 by the RE unit symbol unit. CDM8 multiplexes the CSI-RS of 8 ports (FD2TD4) in the same time and frequency by multiplying the FD-OCC of length 2 and the TD-OCC of length 4 by the RE unit symbol unit.

[0034] Figures 2A - 2D It is a diagram showing an example of the FD-OCC and the TD-OCC. The sequence of the FD-OCC is represented by w f (k’), and the sequence of the TD-OCC is represented by w t (k’). Figure 2A It shows the case where the CDM type is no CDM. Figure 2B It shows the case where the CDM type is FD-CDM2. Figure 2C It shows the case where the CDM type is CDM4. Figure 2D It shows the case where the CDM type is CDM8.

[0035] Figure 3 It is a diagram showing an example of the CSI-RS positions based on Figure 1 for each number of ports. This diagram shows the frequency density, the component resource size (the size in the frequency direction [RE], the size in the time direction [symbol]), and the CDM type for each number of ports.

[0036] For example, Figure 4 is an example showing the resource element (RE) mapping of the CSI-RS set with the number of ports being 32 and the component resource size being 2 subcarriers × 2 symbols ( Figure 1The row index 17). In the frequency domain and time domain of 1 physical resource block (PRB) × 1 time slot, 2 subcarriers × 2 symbols of component resources are multiplexed (frequency division multiplexing (FDM)) 4 times in the frequency domain and multiplexed (time division multiplexing (TDM)) 2 times in the time domain, so that 4 × 2 component resources are mapped. Further, for the CSI-RS in each component resource, the FD-OCC with a length of 2 subcarriers and the TD-OCC with a length of 2 symbols are multiplied, and 4 CSI-RS are multiplexed (code division multiplexing (CDM)) (CDM4, FD2TD2). Thus, in the resources of 1 PRB × 1 time slot, the CSI-RS of 32 ports is transmitted.

[0037] All CSI-RS resources assumed by the UE as a resource set are set to the same starting RB, the same number of RBs, and the same CDM type.

[0038] In NR, NZP-CSI-RS is used for time / frequency tracking, CSI calculation, L1-RSRP / SINR calculation, and mobility.

[0039] The sequence generation for NZP-CSI-RS is based on a pseudo-random number (pseudo-random, pseudo-noise, pseudo-noise (PN)) sequence defined by the following formula.

[0040] [Equation 1]

[0041] Equation (1)

[0042]

[0043] c(n) is defined as follows.

[0044] [Equation 2]

[0045] Equation (2)

[0046] c(n) = (x 1 (n + N C ) + x 2 (n + N C )) mod 2

[0047] x 1 (n + 31) = (x 1 (n + 3) + x 1 (n)) mod 2

[0048] x 2 (n + 31) = (x 2 (n + 3) + x 2 (n + 2) + x 2 (n + 1) + x 2 (n)) mod 2

[0049]

[0050] N C = 1600. The first m-sequence x 1 (n) is initialized by x1(0) = 1, x1(n) = 0, n = 1, 2,..., 30. The second m-sequence x 2 (n) is initialized by c init c init varies according to the purpose of use of the sequence. The pseudo-random number sequence generator for the CSI-RS sequence r(m) is initialized at the start of each OFDM symbol by c init as follows.

[0051] [Equation 3]

[0052] Equation (3)

[0053]

[0054] n s，f μ n is the time slot number within the radio frame. L is the OFDM symbol number within the time slot. n ID corresponds to the scrambling ID parameter (higher layer parameter scramblingID) or the sequence generation setting parameter (higher layer parameter sequenceGenerationConfig). n symb slot is the number of symbols per time slot.

[0055] For each CSI-RS that is set, under the condition that it is satisfied, the UE assumes that the sequence r(m) is mapped to the resource element (RE) (k, l) according to the following formula p，μ .

[0056] [Equation 4]

[0057] Equation (4)

[0058]

[0059]

[0060]

[0061]

[0062]

[0063] n = 0, 1,...

[0064] The condition is for resource element (k, l) p，μ to be within the resource block occupied by the CSI-RS resource set by the UE. The reference point for k = 0 is subcarrier 0 in common resource block 0. ρ is given by the high-layer parameter density in the CSI-RS-ResourceMapping information element (IE) or the CSI-RS-CellMobility IE. The number of ports X is given by the high-layer parameter nrofPorts. K is the index (position) of the frequency domain (subcarrier) for the reference point. l is the index (position) of the time domain (symbol) for the reference point. p is the antenna port index. μ is the subcarrier spacing setting.

[0065] For NZP-CSI-RS, the UE assumes that β CSIRS > 0. β CSIRS If provided, it is the power offset determined by the high-layer parameter powerControlOffsetSS in the NZP-CSI-RS-Resource IE. w f (k′) is the FD-OCC associated with the CDM group. w t (l′) is the TD-OCC associated with the CDM group. r l,ns,fμ (m′) is the PN sequence initialized in symbol l of slot n s,f μ sc RB Nis the number of subcarriers per RB.

[0066] In addition, the RE positions of CSI-RS are common among cells. Even if different scrambling IDs are set per cell, there may be a situation where the inter-sequence interference (inter-cell interference) of CSI-RS becomes high. Generally, it is assumed that the interference of CSI-RS between cells is low, and CSI-RS is mapped to the same RE among multiple cells. Since the finite-length PN sequences are not orthogonal (not orthogonal sequences, pseudo-orthogonal sequences, non-fully orthogonal sequences) even when different scrambling IDs are set among multiple cells, inter-cell interference will occur.

[0067] In addition, the generated PN sequence is common to all ports.

[0068] It is assumed that there are 12 CSI-RS ports. In Figure 1The number of rows is 12, k 0 = 0, k 1 = 4, k 2 = 8, l 0 = 3, the CDM groups 0, 1, 2 as shown in Figure 5 are used. In this case, all 12 ports use the following 2 PN sequences r l,ns,fμ (m').

[0069] · For the PN sequence r 3,ns,fμ (m') for the 3rd OFDM symbol is [r 3 (0), r 3 (1),...].

[0070] · For the PN sequence r 4,ns,fμ (m') for the 4th OFDM symbol is [r 4 (0), r 4 (1),...].

[0071] For the ports within each CDM group, different samples are selected from these PN sequences. For example, for CDM group 0, [r 3 (0), r 3 (4), r 4 (1), r 4 (9)] is selected, and for CDM group 1, [r 3 (1), r 3 (5), r 4 (0), r 4 (10)] is selected.

[0072] Since all ports use the same PN sequence, there is a possibility that adjacent cells use the same PN sequence. In this case, the accuracy of channel estimation based on CSI-RS becomes low.

[0073] Considering that the interference of multiple CSI-RS sequences transmitted in the same RE as described above causes a decrease in measurement accuracy. If the measurement accuracy of CSI-RS decreases, there is a concern that the system performance will degrade.

[0074] Therefore, the inventors of the present invention have come up with a method for reducing the interference between multiple CSI-RS transmitted in the same time / frequency resource.

[0075] Hereinafter, embodiments related to the present disclosure will be described in detail with reference to the accompanying drawings. The wireless communication methods related to each embodiment can be applied separately or in combination of at least two of them.

[0076] In the present disclosure, "A / B" and "at least one of A and B" can also be replaced with each other. In the present disclosure, a cell, a component carrier (CC), a carrier, a bandwidth part (BWP), and a band can also be replaced with each other. In the present disclosure, an index, an ID, an indicator, and a resource ID can also be replaced with each other. In the present disclosure, an RRC parameter, a higher layer parameter, an RRC information element (IE), and an RRC message can also be replaced with each other.

[0077] In the present disclosure, a port, a CSI-RS port, and an antenna port can also be replaced with each other. In the present disclosure, a CSI-RS resource, a CSI-RS configuration, and a resource for time and frequency for CSI-RS can also be replaced with each other.

[0078] (Wireless communication method)

[0079] In the present disclosure, a scrambling ID, a scramblingID, a sequence generation configuration, a sequenceGenerationConfig, a cell ID, a pseudo cell ID, a virtual cell ID, and an nID can also be replaced with each other.

[0080] In the present disclosure, a resource, a CDM group, a CSI-RS port, a cell, a parameter, and an index can also be replaced with each other.

[0081] In the present disclosure, a CDM group can also be a plurality of CSI-RS resources orthogonalized by at least one of time domain OCC and frequency domain OCC in the same RE.

[0082] In the present disclosure, measurement, estimation, calculation, CSI calculation, tracking, L1-RSRP / SINR calculation, and mobility, and channel estimation can also be replaced with each other.

[0083] The UE can also measure CSI-RS to which at least one of the following embodiments is applied.

[0084] <Embodiment 1>

[0085] For a plurality of resources, a resource-specific PN sequence can also be generated. Different PN sequences can also be generated between a plurality of resources.

[0086] For a plurality of resources, different scrambling IDs can also be assigned. Through this scrambling ID, a resource-specific c init , a resource-specific PN sequence is generated.

[0087] <Embodiment 1-1>

[0088] For the CDM group, a CDM-group specific PN sequence can also be generated. Different PN sequences can also be generated among multiple CDM groups.

[0089] For multiple CDM groups, different scrambling IDs can also be allocated. Through this scrambling ID, the CDM-group specific c can also be determined init , and a CDM-group specific PN sequence can be generated.

[0090] The UE can also determine the scrambling ID for the CSI-RS sequence according to any one of the following scrambling ID determination methods 1 and 2.

[0091] [Scrambling ID determination method 1]

[0092] The scrambling ID information (scramblingID) for each CDM group can also be set through RRC parameters.

[0093] [Scrambling ID determination method 2]

[0094] The UE can also identify the scrambling ID specific to each CDM group based on the scrambling ID information (scramblingID) assigned to the CSI-RS resource and a specific parameter x. For example, as Figure 6 shown, the scrambling ID offset y can also be added to the Figure 1 table. The specific parameter x can also be the number of ports. The scrambling ID offset y i can also be associated with the CDM group i. The UE can also determine the scrambling ID offset y for each CDM group based on the specific parameter x i and add the set scrambling ID information to y i to determine the scrambling ID specific to the CDM group. i Thus, among multiple CDM groups, the probability of using a CSI-RS sequence highly correlated with the CSI-RS sequence of an adjacent cell can be reduced. In addition, in at least a part of the CSI-RS ports, the probability of using a CSI-RS sequence less correlated with the CSI-RS sequence of an adjacent cell can be increased.

[0095]

[0096]

[0097]

[0098] For the CSI-RS port (antenna port), a PN sequence of the CSI-RS port can also be generated. Different PN sequences can also be generated among multiple CSI-RS ports.

[0098] For multiple CSI-RS ports, different scrambling IDs can also be allocated. Through this scrambling ID, the CSI-RS-port specific c can also be determined init, generate a PN sequence specific to the CSI-RS port.

[0099] The UE can also determine the scrambling ID for the CSI-RS sequence according to any one of the following scrambling ID determination methods 1 and 2.

[0100] [Scrambling ID determination method 1]

[0101] The scrambling ID information (scramblingID) for each CSI-RS port can also be set through RRC parameters.

[0102] [Scrambling ID determination method 2]

[0103] The UE can also identify the scrambling ID specific to each CSI-RS port based on the scrambling ID information (scramblingID) assigned to the CSI-RS resource and a specific parameter x. For example, it can also append a scrambling ID offset y Figure 1 to the table of i . The specific parameter x can also be the number of ports. The scrambling ID offset y i can also be associated with the CSI-RS port i. The UE can also determine the scrambling ID offset y for each CSI-RS port based on the specific parameter x i and add the set scrambling ID information to y i to determine the scrambling ID specific to the CSI-RS port.

[0104] Thus, in all CSI-RS ports (e.g., 32 ports), the probability of using a CSI-RS sequence highly correlated with the CSI-RS sequence of an adjacent cell can be reduced. In addition, in at least some of the CSI-RS ports, the probability of using a CSI-RS sequence less correlated with the CSI-RS sequence of an adjacent cell is increased.

[0105] <Implementation 2>

[0106] In the existing CSI-RS design in NR, all cells use the same time / frequency resources for CSI-RS. Thus, there is a possibility that multiple cells use samples with the same index from the generated PN sequence. For example, cell i and cell j use samples with the same index for CDM group 2. Cell i selects [r 3 i (0), r 3 i (4), r 4 i (1), r 4 i (9)] for CDM group 2, and cell j selects [r 3j (0), r 3 j (4), r 4 j (1), r 4 j (9). In this case, between cells i and j, the same PN sequence is used, and the inter-cell interference increases.

[0107] In the existing NR, for example, as Figure 7A shown, the association between the PN sequence sample index and the CDM group is common among all cells.

[0108] As Figure 7B shown, between multiple cells, the association between the PN sequence sample index and the CDM group can also be different. This association can be specified in the specification or set through RRC parameters. The PN sequence sample index associated with one CDM group can be either continuous or non - continuous (it can also be equally spaced).

[0109] Between multiple cells, the association between the PN sequence sample index and the CSI - RS port can also be different. This association can be specified in the specification or set by RRC parameters. The PN sequence sample index associated with one CSI - RS port can be either continuous or non - continuous (it can also be equally spaced).

[0110] Between multiple cells, the mapping of the PN sequence sample index to the RE can also be different. This mapping can be specified in the specification or set through RRC parameters.

[0111] Multiple cells can also use samples with different indexes from the PN sequence.

[0112] For the sample index m′ of the PN sequence, it can also be added to the cell - specific value f(x cell ). For example, the sample index m′ of the PN sequence can be expressed by the following formula.

[0113] [Equation 5]

[0114] Equation (5)

[0115]

[0116] f(x cell ) can also be the scrambling ID.

[0117] f(x cell ) can also be the CSI - RS port index.

[0118] f(x cell ) can also be the CDM group index of the CSI - RS.

[0119] According to the above Embodiment 2, even when the same PN sequence is used among multiple cells, interference can be reduced by using different samples of the PN sequence.

[0120] <Embodiment 3>

[0121] Multiple scrambling IDs can also be set by RRC parameters. The number of scrambling IDs can be either 2 or other numbers. Multiple scrambling IDs can also be a list of scrambling IDs.

[0122] It is also possible to indicate (or switch) one of the set multiple scrambling IDs based on the downlink control information (DCI) that triggers A-CSI-RS or A-CSI reporting.

[0123] The indication of the scrambling ID based on DCI can be either a new field added in a new release, a replacement (interpretation) of an existing field, or an implicit indication. The implicit indication can also be based on at least one of the initial control channel element (CCE) index, the initial PRB index, and the initial RE index of the PDCCH that transmits the DCI.

[0124] The UE can also assume the existence of a new field when multiple scrambling IDs (a specific number of scrambling IDs) are set for the CSI-RS resource, otherwise, assume the non-existence of the new field (the new field size is 0 bits).

[0125] Multiple scrambling IDs can also be set for multiple resources respectively. The UE can also determine one scrambling ID for each resource based on DCI. The UE can also determine different scrambling IDs among multiple resources according to Embodiment 1. Multiple scrambling IDs can also be set for each CDM group. Multiple scrambling IDs can also be set for each CSI-RS port.

[0126] According to the above Embodiment 3, the scrambling ID can be dynamically changed, and the CSI sequence can be changed according to the interference situation.

[0127] <Embodiment 4>

[0128] The UE can report at least one of the functions supported by Embodiments 1 to 3 through UE capability information.

[0129] The UE that has reported support for the function can also use the function. The UE that has not reported support for the function can also perform Rel.15 actions.

[0130] According to the above Embodiment 4, the UE can perform appropriate actions according to its capabilities.

[0131] (Wireless communication system)

[0132] Hereinafter, the structure of a wireless communication system according to an embodiment of the present disclosure will be described. In this wireless communication system, communication is performed using any one or a combination of the wireless communication methods according to the above-described embodiments of the present disclosure.

[0133] Figure 8 It is a diagram showing an example of the schematic structure of a wireless communication system according to an embodiment. The wireless communication system 1 may also be a system that realizes communication by using Long Term Evolution (LTE) standardized by the Third Generation Partnership Project (3GPP), the 5th generation mobile communication system New Radio (5G NR), or the like.

[0134] In addition, the wireless communication system 1 may also support dual connectivity (Multi-RAT Dual Connectivity (MR-DC)) between multiple Radio Access Technologies (RATs). MR-DC may include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NE-DC)), and the like.

[0135] In EN-DC, the base station (eNB) of LTE (E-UTRA) is the Master Node (MN), and the base station (gNB) of NR is the 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.

[0136] The wireless communication system 1 may also support dual connectivity between multiple base stations within the same RAT (for example, dual connectivity where both the MN and the SN are base stations (gNBs) of NR (NR-NR Dual Connectivity (NN-DC))).

[0137] The wireless communication system 1 may also include: a base station 11 that forms a macro cell C1 with a relatively wide coverage area, and a base station 12 (12a - 12c) that is disposed within 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 within at least one cell. The configuration, number, etc. of each cell 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, they are collectively referred to as the base station 10.

[0138] The user terminal 20 may also be connected to at least one of the multiple base stations 10. The user terminal 20 may also utilize at least one of carrier aggregation (CA) and dual connectivity (DC) that uses multiple component carriers (CCs).

[0139] Each CC may 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 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 of 6 GHz or less (sub - 6 GHz), and FR2 may be a frequency band higher than 24 GHz (above - 24 GHz). Additionally, the frequency bands, definitions, etc. of FR1 and FR2 are not limited thereto. For example, FR1 may correspond to a frequency band higher than FR2.

[0140] Furthermore, the user terminal 20 may also communicate in each CC by utilizing at least one of time division duplex (TDD) and frequency division duplex (FDD).

[0141] The multiple base stations 10 may also be connected by wire (e.g., optical fiber based on the Common Public Radio Interface (CPRI), X2 interface, etc.) or wirelessly (e.g., NR communication). For example, when NR communication is utilized as a backhaul between the base stations 11 and 12, the base station 11, which is equivalent to the upper - level station, may also be referred to as an Integrated Access Backhaul (IAB) donor, and the base station 12, which is equivalent to a relay station, may also be referred to as an IAB node.

[0142] Base station 10 can also be connected to the core network 30 via other base stations 10 or directly. For example, 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), etc.

[0143] User terminal 20 can also be a terminal that supports at least one of communication methods such as LTE, LTE-A, 5G, etc.

[0144] In the wireless communication system 1, a wireless access method based on Orthogonal Frequency Division Multiplexing (OFDM) can also 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. can also be used.

[0145] The wireless access method can also be referred to as a waveform. Additionally, in the wireless communication system 1, other wireless access methods (for example, other single-carrier transmission methods, other multi-carrier transmission methods) can also be applied in the wireless access methods of the UL and the DL.

[0146] 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)), etc. that are shared among the user terminals 20 can also be used.

[0147] In addition, in the wireless communication system 1, as the uplink channel, the uplink shared channel (Physical Uplink Shared Channel (PUSCH)), uplink control channel (Physical Uplink Control Channel (PUCCH)), random access channel (Physical Random Access Channel (PRACH)), etc. shared by each user terminal 20 can also be used.

[0148] User data, high-layer control information, System Information Block (SIB), etc. are transmitted through the PDSCH. User data, high-layer control information, etc. can also be transmitted through the PUSCH. In addition, the Master Information Block (MIB) can be transmitted through the PBCH.

[0149] Low-layer control information can also be transmitted through the PDCCH. The low-layer control information can also include, for example, downlink control information (Downlink Control Information (DCI)), and the downlink control information includes scheduling information of at least one of the PDSCH and the PUSCH.

[0150] In addition, the DCI that schedules the PDSCH can also be referred to as DL allocation, DL DCI, etc., and the DCI that schedules the PUSCH can also be referred to as UL grant, UL DCI, etc. In addition, the PDSCH can also be interpreted as DL data, and the PUSCH can also be interpreted as UL data.

[0151] In the detection of the PDCCH, the Control Resource Set (CORESET) and the search space can also be utilized. The CORESET corresponds to the resource for searching for DCI. The search space corresponds to the search area and search method for PDCCH candidates. One CORESET can also be associated with one or more search spaces. The UE can also monitor the CORESET associated with a certain search space based on the search space setting.

[0152] A search space may also correspond to PDCCH candidates that match one or more aggregation levels. One or more search spaces may also be referred to as a set of search spaces. Additionally, in the present disclosure, terms such as "search space", "set of search spaces", "search space configuration", "set of search space configurations", "CORESET", "CORESET configuration", etc. may be used interchangeably with each other.

[0153] Uplink control information (Uplink Control Information (UCI)) including at least one of channel state information (Channel State Information (CSI)), delivery confirmation information (e.g., also referred to as Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK / NACK, etc.), and scheduling request (Scheduling Request (SR)) may also be transmitted via PUCCH. A random access preamble for establishing a connection with a cell may also be transmitted via PRACH.

[0154] Additionally, in the present disclosure, the downlink, uplink, etc. may also be expressed without "link". Furthermore, it may also be expressed that "Physical" is not included at the beginning of various channels.

[0155] In the wireless communication system 1, a synchronization signal (Synchronization Signal (SS)), a downlink reference signal (Downlink Reference Signal (DL-RS)), etc. may 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)), etc. may also be transmitted.

[0156] The synchronization signal may also 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 an SS / PBCH block, an SS block (SS Block (SSB)), etc. In addition, SS, SSB, etc. may also be referred to as reference signals.

[0157] In addition, in the wireless communication system 1, as an Uplink Reference Signal (UL-RS), a reference signal for measurement (Sounding Reference Signal (SRS)), a demodulation reference signal (DMRS), etc. may also be transmitted. In addition, DMRS may also be referred to as a UE-specific Reference Signal.

[0158] (Base station)

[0159] Figure 9 FIG. is an example showing the structure of a base station according to an embodiment. The base station 10 includes 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, one or more of the control unit 110, the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission path interface 140 may be provided respectively.

[0160] In addition, in this example, the functional blocks of the characteristic parts in the present embodiment are mainly shown, and it can also be assumed that the base station 10 also has other functional blocks required for wireless communication. A part of the processing of each unit described below may also be omitted.

[0161] The control unit 110 implements overall control of the base station 10. The control unit 110 can be composed of a controller, a control circuit, etc. described based on common knowledge in the technical field related to the present disclosure.

[0162] The control unit 110 can also control the generation, scheduling (e.g., resource allocation, mapping), etc. of signals. The control unit 110 can also control the 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 can also generate data, control information, sequences, etc. to be transmitted as signals and forward them to the transmission and reception unit 120. The control unit 110 can also perform call processing (setting, releasing, etc.) of communication channels, state management of the base station 10, management of radio resources, etc.

[0163] The transmission and reception unit 120 can also include a baseband unit 121, a Radio Frequency (RF) unit 122, and a measurement unit 123. The baseband unit 121 can also include a transmission processing unit 1211 and a reception processing unit 1212. The transmission and reception unit 120 can be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmission and reception circuit, etc. that can be described based on common knowledge in the technical field related to the present disclosure.

[0164] The transmission and reception unit 120 can be configured as an integrated transmission and reception unit, or can be composed of a transmission unit and a reception unit. The transmission unit can also be composed of the transmission processing unit 1211 and the RF unit 122. The reception unit can also be composed of the reception processing unit 1212, the RF unit 122, and the measurement unit 123.

[0165] The transmission and reception antenna 130 can be composed of an antenna that can be described based on common knowledge in the technical field related to the present disclosure, such as an array antenna, etc.

[0166] The transmission and reception unit 120 can also transmit the above-mentioned downlink channels, synchronization signals, downlink reference signals, etc. The transmission and reception unit 120 can also receive the above-mentioned uplink channels, uplink reference signals, etc.

[0167] The transmission and reception unit 120 can also use digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), etc. to form at least one of a transmission beam and a reception beam.

[0168] The transmission / reception unit 120 (transmission processing unit 1211) may also perform processing of the Packet Data Convergence Protocol (PDCP) layer, processing of the Radio Link Control (RLC) layer (e.g., RLC retransmission control), processing of the Medium Access Control (MAC) layer (e.g., HARQ retransmission control), etc. on the data, control information, etc. obtained from the control unit 110, and generate a bit string to be transmitted.

[0169] The transmission / reception unit 120 (transmission processing unit 1211) may also perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering processing, Discrete Fourier Transform (DFT) processing (if necessary), Inverse Fast Fourier Transform (IFFT) processing, precoding, digital-to-analog conversion, etc. on the bit string to be transmitted, and output a baseband signal.

[0170] The transmission / reception unit 120 (RF unit 122) may also perform modulation to the radio frequency band, filtering processing, amplification, etc. on the baseband signal, and transmit the radio frequency band signal via the transmission / reception antenna 130.

[0171] On the other hand, the transmission / reception unit 120 (RF unit 122) may also perform amplification, filtering processing, demodulation to the baseband signal, etc. on the radio frequency band signal received through the transmission / reception antenna 130.

[0172] The transmission / reception unit 120 (reception processing unit 1212) may also perform reception processing such as analog-to-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (if necessary), filtering processing, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing, etc. on the obtained baseband signal, and obtain user data, etc.

[0173] The transmitting and receiving unit 120 (measurement unit 123) may also perform measurements related to the received signal. For example, the measurement unit 123 may also perform Radio Resource Management (RRM) measurements, Channel State Information (CSI) measurements, etc. based on the received signal. The measurement unit 123 may also perform measurements on received power (e.g., Reference Signal Received Power (RSRP)), received quality (e.g., Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR)), signal strength (e.g., Received Signal Strength Indicator (RSSI)), propagation path information (e.g., CSI), etc. The measurement results may also be output to the control unit 110.

[0174] The transmission path interface 140 may also transmit and receive signals (backhaul signaling) between the device included in the core network 30, other base stations 10, etc., and may also obtain and transmit user data (user plane data), control plane data, etc. for the user terminal 20.

[0175] In addition, the transmitting unit and the receiving unit of the base station 10 in the present disclosure may also be constituted by at least one of the transmitting and receiving unit 120, the transmitting and receiving antenna 130, and the transmission path interface 140.

[0176] The transmitting and receiving unit 120 may also transmit setting information for generating different Channel State Information (CSI)-Reference Signal (RS) sequences between multiple resources. The multiple resources may each be any one of a CSI-RS port, a Code Division Multiplexing (CDM) group, and a cell. The control unit 110 may also generate multiple CSI-RS sequences based on the setting information.

[0177] (User Terminal)

[0178] Figure 10 FIG. is an example showing the structure of a user terminal according to an embodiment. The user terminal 20 includes a control unit 210, a transmitting and receiving unit 220, and a transmitting and receiving antenna 230. In addition, one or more of the control unit 210, the transmitting and receiving unit 220, and the transmitting and receiving antenna 230 may be provided respectively.

[0179] In addition, in this example, the functional blocks of the characteristic part in this embodiment are mainly shown, and it can also be assumed that the user terminal 20 also has other functional blocks required for wireless communication. A part of the processing of each unit described below can also be omitted.

[0180] The control unit 210 implements the overall control of the user terminal 20. The control unit 210 can be composed of a controller, a control circuit, etc. that can be described based on the common knowledge in the technical field related to the present disclosure.

[0181] The control unit 210 can also control the generation, mapping, etc. of signals. The control unit 210 can also control the transmission / reception, measurement, etc. using the transmission / reception unit 220 and the transmission / reception antenna 230. The control unit 210 can also generate data, control information, sequences, etc. to be transmitted as signals, and forward them to the transmission / reception unit 220.

[0182] The transmission / reception unit 220 may include a baseband unit 221, an RF unit 222, and a measurement unit 223. The baseband unit 221 may include a transmission processing unit 2211 and a reception processing unit 2212. The transmission / reception unit 220 can be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmission / reception circuit, etc. that can be described based on the common knowledge in the technical field related to the present disclosure.

[0183] The transmission / reception unit 220 can be configured as an integrated transmission / reception unit, or can be composed of a transmission unit and a reception unit. The transmission unit can also be composed of the transmission processing unit 2211 and the RF unit 222. The reception unit can also be composed of the reception processing unit 2212, the RF unit 222, and the measurement unit 223.

[0184] The transmission / reception antenna 230 can be composed of an antenna that can be described based on the common knowledge in the technical field related to the present disclosure, such as an array antenna.

[0185] The transmission / reception unit 220 can also receive the above-mentioned downlink channels, synchronization signals, downlink reference signals, etc. The transmission / reception unit 220 can also transmit the above-mentioned uplink channels, uplink reference signals, etc.

[0186] The transmission / reception unit 220 can also use digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), etc. to form at least one of a transmission beam and a reception beam.

[0187] The transmission / reception unit 220 (transmission processing unit 2211) may also perform PDCP layer processing, RLC layer processing (e.g., RLC retransmission control), MAC layer processing (e.g., HARQ retransmission control), etc. on the data, control information, etc. obtained from the control unit 210, and generate a bit string to be transmitted.

[0188] The transmission / reception unit 220 (transmission processing unit 2211) may also perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering processing, DFT processing (if necessary), IFFT processing, precoding, digital-to-analog conversion, etc. on the bit string to be transmitted, and output a baseband signal.

[0189] In addition, regarding whether to apply DFT processing, it may also be based on the setting of transform precoding. For a certain channel (e.g., PUSCH), when the transform precoding is active (enabled), the transmission / reception unit 220 (transmission processing unit 2211) may also perform DFT processing as the above-mentioned transmission processing in order to transmit the channel using the DFT-s-OFDM waveform. In other cases, the transmission / reception unit 220 (transmission processing unit 2211) may not perform DFT processing as the above-mentioned transmission processing.

[0190] The transmission / reception unit 220 (RF unit 222) may also perform modulation to the radio frequency band, filtering processing, amplification, etc. on the baseband signal, and transmit the radio frequency band signal via the transmission / reception antenna 230.

[0191] On the other hand, the transmission / reception unit 220 (RF unit 222) may also perform amplification, filtering processing, demodulation to the baseband signal, etc. on the radio frequency band signal received through the transmission / reception antenna 230.

[0192] The transmission / reception unit 220 (reception processing unit 2212) may also perform reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering processing, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing, etc. on the obtained baseband signal, and obtain user data, etc.

[0193] The transmission / reception unit 220 (measurement unit 223) may also perform measurements related to the received signal. For example, the measurement unit 223 may also perform RRM measurements, CSI measurements, etc. based on the received signal. The measurement unit 223 may also perform measurements on received power (e.g., RSRP), reception 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.

[0194] In addition, the transmission unit and the reception unit of the user terminal 20 in the present disclosure may also be constituted by at least one of the transmission / reception unit 220 and the transmission / reception antenna 230.

[0195] The transmission / reception unit 220 receives setting information for using different channel state information (CSI)-reference signal (RS) sequences among a plurality of resources, and each of the plurality of resources may be any one of a CSI-RS port, a code division multiplexing (CDM) group, and a cell. The control unit 210 may also perform measurements using a plurality of CSI-RS sequences based on the setting information.

[0196] The setting information may also include different scrambling IDs for the plurality of resources. The plurality of CSI-RS sequences may also be based on the different scrambling IDs.

[0197] The setting information may also include specific parameters for the CSI-RS resources. The control unit 210 may also determine different scrambling IDs for the plurality of resources based on the specific parameters. The plurality of CSI-RS sequences may also be based on the different scrambling IDs.

[0198] The setting information may also include a plurality of scrambling IDs. The control unit 210 may also determine one scrambling ID from the plurality of scrambling IDs based on the downlink control information. The plurality of CSI-RS sequences may also be based on the one scrambling ID.

[0199] (Hardware Structure)

[0200] In addition, the block diagrams used in the description of the above embodiments illustrate blocks of functional units. 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 may be implemented by a physically or logically combined device, or two or more physically or logically separated devices may be directly or indirectly (e.g., by wire, wireless, etc.) connected and implemented by these multiple devices. The functional block may also be implemented by combining the above one device or the above multiple devices with software.

[0201] Here, in the functions, there are judgment, decision-making, determination, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, solution, selection, establishment, comparison, assumption, expectation, regarded as, broadcasting, notifying, communicating, forwarding, configuration (setting), reconfiguration (reconfiguring), allocation (allocating, mapping), assignment, etc., but are not limited to these. For example, a functional block (structural unit) that implements the transmission function may also be referred to as a transmitting unit, a transmitter, etc. Any of them is as described above, and the implementation method is not particularly limited.

[0202] For example, a base station, a user terminal, etc. in an embodiment of the present disclosure may also function as a computer that performs the processing of the wireless communication method of the present disclosure. Figure 11 FIG. is an example of the hardware structure of a base station and a user terminal according to an embodiment. The above base station 10 and user terminal 20 may 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, etc.

[0203] In addition, in the present disclosure, terms such as device, circuit, equipment, section, unit, etc. can be replaced with each other. The hardware structure of the base station 10 and the user terminal 20 may be configured to include one or more of each device shown in the figure, or may be configured not to include some devices.

[0204] For example, only one processor 1001 is illustrated, but there may be multiple processors. In addition, the processing may be executed by one processor, or may be executed by two or more processors simultaneously, sequentially, or by other means. In addition, the processor 1001 may also be implemented by one or more chips.

[0205] Regarding each function in the base station 10 and the user terminal 20, for example, by reading a specific software (program) into hardware such as the processor 1001 and the memory 1002, the processor 1001 performs operations and controls communication via the communication device 1004, or controls at least one of reading and writing data in the memory 1002 and the storage 1003, thereby realizing it.

[0206] The processor 1001, for example, causes the operating system to operate to control the entire computer. The processor 1001 may also be constituted by a central processing unit (Central Processing Unit (CPU)) including an interface with peripheral devices, a control device, an arithmetic device, registers, and the like. For example, at least a part of the above control unit 110 (210), transmission / reception unit 120 (220), etc. may also be implemented by the processor 1001.

[0207] In addition, the processor 1001 reads a program (program code), software module, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and performs various processes based on them. As the program, a program that causes the computer to execute at least a part of the operations described in the above embodiments can be used. For example, the control unit 110 (210) may also be implemented by a control program stored in the memory 1002 and operating in the processor 1001, and the same can be applied to other functional blocks.

[0208] The memory 1002 may also be a computer-readable recording medium, and may be constituted by at least one of, for example, a read-only memory (Read Only Memory (ROM)), an erasable programmable read-only memory (Erasable Programmable ROM (EPROM)), an electrically erasable programmable read-only memory (Electrically EPROM (EEPROM)), a random access memory (Random Access Memory (RAM)), and 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 a program (program code), software module, etc. executable for implementing the wireless communication method according to an embodiment of the present disclosure.

[0209] The storage 1003 may also be a computer-readable recording medium, and may be constituted by at least one of, for example, a flexible disc, a floppy (registered trademark) disc, an optical disc (e.g., a compact disc (Compact Disc ROM (CD-ROM)) etc.), a digital versatile disc, a Blu-ray (registered trademark) disc, a removable disc, a hard disk drive, a smart card, a flash device (e.g., a card, a stick, a key drive), a magnetic stripe, a database, a server, and other appropriate storage media. The storage 1003 may also be referred to as an auxiliary storage device.

[0210] The communication device 1004 is hardware (a transmitting and receiving device) for performing communication between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, a communication module, etc. In order to implement at least one of, for example, Frequency Division Duplex (FDD) and Time Division Duplex (TDD), the communication device 1004 may also be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. For example, the above-described transmitting and receiving unit 120 (220), the transmitting and receiving antenna 130 (230), etc. may also be implemented by the communication device 1004. The transmitting and receiving unit 120 (220) may also be physically or logically separated and installed by a transmitting unit 120a (220a) and a receiving unit 120b (220b).

[0211] The input device 1005 is an input device (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that accepts input from the outside. The output device 1006 is an output device (e.g., a display, a speaker, a Light Emitting Diode (LED) lamp, etc.) that performs output to the outside. In addition, the input device 1005 and the output device 1006 may also be of an integrated structure (e.g., a touch panel).

[0212] In addition, each device such as the processor 1001 and the memory 1002 is connected by a bus 1007 for communicating information. The bus 1007 may be constituted by a single bus or may be constituted by different buses between the respective devices.

[0213] 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), a Field Programmable Gate Array (FPGA), etc., and a part or all of each functional block may also be implemented by this hardware. For example, the processor 1001 may also be implemented by at least one of these hardwares.

[0214] (Variant example)

[0215] In addition, terms described in this disclosure and terms required for understanding this disclosure may also be replaced with terms having the same or similar meanings. For example, a channel, a symbol, and a signal (signal or signaling) may also be replaced with each other. In addition, a signal may also be a message. A reference signal can also be abbreviated as RS and may also be referred to as a pilot, a pilot signal, etc. according to the applied standard. In addition, a component carrier (Component Carrier (CC)) may also be referred to as a cell, a frequency carrier, a carrier frequency, etc.

[0216] A radio frame may also be composed of one or more periods (frames) in the time domain. Each of the one or more periods (frames) constituting the radio 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) independent of the numerology.

[0217] Here, the numerology may also refer to communication parameters applied in at least one of the transmission and reception of a certain signal or channel. For example, the numerology may also represent at least one of a subcarrier spacing (SubCarrier Spacing (SCS)), a bandwidth, a symbol length, a cyclic prefix length, a transmission time interval (Transmission Time Interval (TTI)), the number of symbols per TTI, a radio frame structure, specific filtering processing performed by a transmitter-receiver in the frequency domain, specific windowing processing performed by a transmitter-receiver in the time domain, etc.

[0218] 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 the numerology.

[0219] A time slot may also include a plurality of 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 a smaller number of 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 PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot may also be referred to as PDSCH (PUSCH) mapping type B.

[0220] A radio frame, subframe, time slot, mini-slot, and symbol all represent time units for transmitting signals. A radio frame, subframe, time slot, mini-slot, and symbol may also use other corresponding names. In addition, time units such as frames, subframes, time slots, mini-slots, and symbols in the present disclosure may also be replaced with each other.

[0221] For example, a subframe may also be referred to as a TTI, multiple consecutive subframes may also be referred to as a TTI, a time slot or a mini-slot may also 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, may also be a period shorter than 1 ms (for example, 1 - 13 symbols), or may also be a period longer than 1 ms. In addition, the unit representing a TTI may not be referred to as a subframe, but may be referred to as a time slot, a mini-slot, etc.

[0222] Here, a TTI refers to, for example, the smallest time unit for scheduling in wireless communication. For example, in an LTE system, a base station performs scheduling to allocate radio resources (frequency bandwidth, transmission power, etc. that can be used in each user terminal) in units of TTI to each user terminal. In addition, the definition of a TTI is not limited to this.

[0223] A TTI may also be a transmission time unit for a data packet (transmission block), code block, codeword, etc. that has undergone channel coding, and may also become a processing unit for scheduling, link adaptation, etc. In addition, when a TTI is given, the time interval (for example, the number of symbols) in which a transmission block, code block, codeword, etc. is actually mapped may also be shorter than the TTI.

[0224] In addition, when a time slot or a mini-slot is referred to as a TTI, one or more TTIs (that is, one or more time slots or one or more mini-slots) may also become the smallest time unit for scheduling. In addition, the number of time slots (mini-slot numbers) constituting the smallest time unit of this scheduling may also be controlled.

[0225] A TTI having a time length of 1 ms may also be referred to as a normal TTI (TTI in 3GPP Rel.8 - 12), standard TTI, long TTI, normal subframe, standard subframe, long subframe, time slot, etc. A TTI shorter than a normal TTI may also be referred to as a shortened TTI, short TTI, partial TTI (partial or fractional TTI), shortened subframe, short subframe, mini-slot, sub-time slot, time slot, etc.

[0226] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) can also be interpreted as a TTI having a time length exceeding 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 the long TTI and more than 1 ms.

[0227] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may also include one or more consecutive subcarriers (subcarriers) in the frequency domain. The number of subcarriers included in an RB may be the same regardless of the parameter set, for example, it may be 12. The number of subcarriers included in an RB may also be determined based on the parameter set.

[0228] In addition, an RB may also include one or more symbols in the time domain, and may also be the length of one time slot, one mini-slot, one subframe, or one TTI. One TTI, one subframe, etc. may also be composed of one or more resource blocks respectively.

[0229] In addition, one or more RBs may also be referred to as a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, etc.

[0230] In addition, a resource block may also be composed of one or more resource elements (REs). For example, one RE may also be a radio resource area of one subcarrier and one symbol.

[0231] A bandwidth part (BWP) (which may also be referred to as a partial bandwidth, etc.) may also represent a subset of consecutive common RBs (common resource blocks) used for a certain parameter set in a certain carrier. Here, the common RBs may also be determined by the index of the RBs based on the common reference point of the carrier. A PRB may also be defined in a certain BWP and be additionally numbered within that BWP.

[0232] An UL BWP (BWP for UL) and a DL BWP (BWP for DL) may also be included in a BWP. For a UE, one or more BWPs may also be set within one carrier.

[0233] At least one of the set BWPs may be active, and the UE may not assume to transmit and receive specific signals / channels outside the active BWP. In addition, "cell", "carrier", etc. in the present disclosure may also be interpreted as "BWP".

[0234] 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.

[0235] 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.

[0236] In the present disclosure, the names used for parameters, etc. are not limiting in all respects. In addition, the mathematical formulas, etc. using these parameters may be different from those explicitly disclosed in the present disclosure. The 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.

[0237] Information, signals, etc. described in the present 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.

[0238] Furthermore, information, signals, etc. can be output from a high layer (upper layer) to a low layer (lower layer) or from a low layer to a high layer. Information, signals, etc. can also be input and output via a plurality of network nodes.

[0239] 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.

[0240] 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.

[0241] 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)).

[0242] 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).

[0243] 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).

[0244] Software, whether referred to as software, firmware, middleware, micro-code, hardware description language, or by any other name, shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, sub-programs, software modules, applications, software applications, software packages, routines, sub-routines, objects, executable files, threads of execution, procedures, functions, and the like.

[0245] In addition, software, instructions, information, etc. can also be sent and received via a transmission medium. For example, in the case of sending software from a website, server, or other remote source using at least one of wired technologies (coaxial cables, fiber optic cables, twisted pairs, Digital Subscriber Line (DSL), etc.) and wireless technologies (infrared, microwave, etc.), at least one of these wired and wireless technologies is included in the definition of the transmission medium.

[0246] Terms such as "system" and "network" used in this disclosure can be used interchangeably. "Network" can also mean a device (e.g., a base station) included in the network.

[0247] In this disclosure, terms such as "precoding", "precoder", "weights (precoding weights)", "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", etc. can be used interchangeably.

[0248] 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 cell, and pico cell.

[0249] 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.

[0250] In the present disclosure, terms such as “mobile station (MS)”, “user terminal”, “user device (User Equipment (UE))”, and “terminal” are used interchangeably.

[0251] 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 some other appropriate terminology.

[0252] At least one of the base station and the mobile station may also be referred to as a transmitting device, a receiving device, a wireless communication device, etc. Additionally, at least one of the base station and the mobile station may also be a device mounted on a moving body, the moving body itself, etc. The moving body may be a vehicle (e.g., a car, an airplane, etc.), may also be a moving body that moves in an unmanned manner (e.g., a drone, a self-driving vehicle, etc.), and may also be a robot (humanoid or non-humanoid). Additionally, at least one of the base station and the mobile station also includes a device that does not necessarily move during a communication operation. 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.

[0253] Furthermore, the base station in the present disclosure may also be interpreted as a user terminal. For example, for a structure in which communication between a base station and a user terminal is replaced by communication between multiple user terminals (e.g., may also be referred to as Device-to-Device (D2D), Vehicle-to-Everything (V2X), etc.), the various aspects / embodiments of the present disclosure may also be applied. In this case, it may also be configured such that the user terminal 20 has the functions of the above-mentioned base station 10. Additionally, expressions such as "uplink" and "downlink" may also be interpreted as expressions corresponding to inter-terminal communication (e.g., "side"). For example, an uplink channel, a downlink channel, etc. may also be interpreted as a side channel.

[0254] Similarly, the user terminal in the present disclosure may also be interpreted as a base station. In this case, it may also be configured such that the base station 10 has the functions of the above-mentioned user terminal 20.

[0255] In the present disclosure, an action performed by the base station may sometimes be performed by its upper node according to the situation. Apparently, in a network including one or more network nodes having a base station, various actions for communicating with a terminal may be performed by the base station, one or more network nodes other than the base station (e.g., considering a Mobility Management Entity (MME), a Serving-Gateway (S-GW), etc., but not limited to these), or a combination thereof.

[0256] Each mode / embodiment described in the present disclosure can be used alone, in combination, or switched during execution. In addition, the processing procedures, sequences, flowcharts, etc. of each mode / embodiment described in the present disclosure can be reordered as long as there is no contradiction. For example, for the methods described in the present disclosure, the elements of various steps are presented in an exemplary order, but are not limited to the specific order presented.

[0257] Each mode / embodiment described in the present disclosure can also be applied to Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER3G, IMT-Advanced, the fourth generation mobile communication system (4G), the fifth generation mobile communication system (5G), the sixth generation mobile communication system (6G), the xth generation mobile communication system (xG) (where 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, next-generation systems extended based on them, etc. In addition, multiple systems can also be combined (for example, a combination of LTE or LTE-A and 5G) for application.

[0258] As used in this disclosure, the recitation "based on" does not mean "based solely on" unless specifically stated otherwise. In other words, the recitation "based on" means both "based solely on" and "based at least on".

[0259] Any reference to an element using designations such as "first", "second", etc. used in this disclosure does not fully limit the quantity or order of these elements. These designations can be used in this disclosure as a convenient way to distinguish between two or more elements. Therefore, a reference to a first and a second element does not mean that only two elements can be employed, or that the first element must in some way take precedence over the second element.

[0260] The term "determining" as used in this disclosure encompasses a variety of actions in some cases. For example, "determining" can also be regarded as "determining" in cases of judging, calculating, computing, processing, deriving, investigating, looking up (searching, inquiry (query)) (e.g., searching in a table, database, or other data structure), ascertaining, etc.

[0261] In addition, "determining" can also be regarded as "determining" in cases of receiving (e.g., receiving information), transmitting (e.g., transmitting information), input, output, accessing (e.g., accessing data in a memory), etc.

[0262] In addition, "determining" can also be regarded as "determining" in cases of resolving, selecting, choosing, establishing, comparing, etc. That is to say, "determining" can also be regarded as "determining" certain actions.

[0263] In addition, "determining" can also be interpreted as "assuming", "expecting", "considering", etc.

[0264] As used in this disclosure, the "maximum transmit power" may mean the "maximum value of the transmit power", or the nominal UE maximum transmit power, or the rated UE maximum transmit power.

[0265] As used in this disclosure, terms such as "connected" and "coupled", or all of their variants, mean all direct or indirect connections or couplings between two or more elements, and can include the case where there is one or more intermediate elements between the two elements that are "connected" or "coupled" to each other. The coupling or connection between elements can be physical, logical, or a combination of these. For example, "connected" can also be interpreted as "access".

[0266] In this disclosure, when connecting two elements, it can be considered that one or more wires, cables, printed electrical connections, etc. are used, and electromagnetic energy having wavelengths in the wireless frequency domain, microwave region, and optical (both visible and invisible) regions is used as several non-limiting and non-exhaustive examples to "connect" or "couple" to each other.

[0267] In this disclosure, a term such as "A is different from B" can also mean that "A is different from B mutually". In addition, this term can also mean that "A and B are each different from C". Terms such as "separated" and "coupled" can also be interpreted as "different" in the same way.

[0268] In this disclosure, when using "include", "including", and their variants, these terms, like the term "comprising", are meant to be inclusive. Further, the term "or" used in this disclosure does not mean exclusive or.

[0269] In this disclosure, for example, in cases where articles are added through translation such as a, an, and the in English, this disclosure can also include cases where the nouns following these articles are in the plural form.

[0270] As described above, the invention related to the present disclosure has been described in detail. However, for those skilled in the art, the invention related to the present disclosure is obviously not limited to the embodiments described in the present disclosure. The invention related to the present disclosure can be implemented in the form of amendments and changes without departing from the gist and scope of the present invention determined based on the description of the claims. Therefore, the description of the present disclosure is for illustrative purposes and does not carry any restrictive meaning for the invention related to the present disclosure.

Claims

1. A terminal, comprising: a receiving unit, configured to receive configuration information for using different Channel State Information - Reference Signal sequences (CSI-RS sequences) among a plurality of resources; wherein, the plurality of resources are respectively any one of a CSI-RS port and a Code Division Multiplexing (CDM) group; and a control unit, configured to perform measurements using a plurality of CSI-RS sequences based on the configuration information; the configuration information includes the number of ports for CSI-RS resources; the control unit determines respective scrambling ID offsets for the plurality of resources based on the number of ports, and determines different scrambling IDs for the plurality of resources by adding the configured scrambling ID information to the scrambling ID offsets; the plurality of CSI-RS sequences are based on the different scrambling IDs.

2. A wireless communication method for a terminal, comprising: a step of receiving configuration information for using different Channel State Information - Reference Signal sequences (CSI-RS sequences) among a plurality of resources; wherein, the plurality of resources are respectively any one of a CSI-RS port and a Code Division Multiplexing (CDM) group; and a step of performing measurements using a plurality of CSI-RS sequences based on the configuration information; the configuration information includes the number of ports for CSI-RS resources; based on the number of ports, respective scrambling ID offsets for the plurality of resources are determined, and different scrambling IDs for the plurality of resources are determined by adding the configured scrambling ID information to the scrambling ID offsets; the plurality of CSI-RS sequences are based on the different scrambling IDs.

3. A base station, comprising: a transmitting unit, configured to transmit configuration information for using different Channel State Information - Reference Signal sequences (CSI-RS sequences) among a plurality of resources; wherein, the plurality of resources are respectively any one of a CSI-RS port and a Code Division Multiplexing (CDM) group; and a control unit, configured to generate a plurality of CSI-RS sequences based on the configuration information; the configuration information includes the number of ports for CSI-RS resources; the control unit determines respective scrambling ID offsets for the plurality of resources based on the number of ports, and determines different scrambling IDs for the plurality of resources by adding the configured scrambling ID information to the scrambling ID offsets; the plurality of CSI-RS sequences are based on the different scrambling IDs.

4. A system having a terminal and a base station, wherein the base station comprises: a transmitting unit, configured to transmit configuration information for using different Channel State Information - Reference Signal sequences (CSI-RS sequences) among a plurality of resources; wherein, the plurality of resources are respectively any one of a CSI-RS port and a Code Division Multiplexing (CDM) group, and the terminal comprises: a receiving unit, configured to receive the configuration information; and a control unit, configured to perform measurements using a plurality of CSI-RS sequences based on the configuration information; the configuration information includes the number of ports for CSI-RS resources; The control unit of the terminal determines respective scrambling ID offsets for the plurality of resources based on the number of ports, and determines different scrambling IDs for the plurality of resources by adding the set scrambling ID information to the scrambling ID offsets. The plurality of CSI-RS sequences are based on the different scrambling IDs.

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