Terminal, wireless communication method, and base station

Abstract

A terminal according to an aspect of the present disclosure includes: a receiving unit that receives information related to a channel state information (CSI)-reference signal (RS); and a control unit that, based on the above information, determines at least one of a reference signal sequence for the CSI-RS, an orthogonal cover code (OCC) for the CSI-RS, a specific code for decoding the OCC, and a resource that does not overlap with a specific CSI-RS resource for at least one port of a code division multiplexing (CDM) group. According to an aspect of the present disclosure, the measurement accuracy of the 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, high performance, etc. of LTE (Third Generation Partnership Project (3GPP) Release (Rel.) 8, 9).

[0003] Subsequent systems of LTE are also being studied (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, Physical Uplink Shared Channel (PUSCH)) and a UL control channel (for example, 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 (RS) 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, it is considered that the accuracy of measurement (estimation, tracking) is reduced due to the interference of multiple CSI-RSs transmitted in the same resource element (RE). If the measurement accuracy of CSI-RS is reduced, the system performance may deteriorate.

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

[0012] Means for Solving the Problems

[0013] A terminal according to one aspect of the present disclosure includes: a receiving unit that receives information related to a channel state information (CSI)-reference signal (RS); and a control unit that determines, based on the information, at least one of a reference signal sequence for the CSI-RS, an orthogonal cover code (OCC) for the CSI-RS, a specific code for decoding the OCC, and a resource that does not overlap with a specific CSI-RS resource for at least one code division multiplexing (CDM) group of ports.

[0014] Effects of the Invention

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

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

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

[0018] Figure 3 is a diagram showing an example of the position of CSI-RS per port count.

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

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

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

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

[0023] Figure 8 is a diagram showing an example of the mapping from the PN sequence in Scenario 1 to physical resources.

[0024] Figure 9 is a diagram showing an example of the mapping from the PN sequence in Scenario 2 to physical resources.

[0025] Figure 10 is a diagram showing an example of an OCC problem.

[0026] Figure 11 is a diagram showing an example of the configuration of new UE CSI-RS resources and existing UE CSI-RS resources.

[0027] Figure 12 is a diagram showing another example of the configuration of new UE CSI-RS resources and existing UE CSI-RS resources.

[0028] Figure 13A and Figure 13B is a diagram showing an example of a method for notifying the start index of OCC for each CDM group.

[0029] Figure 14A and Figure 14B is a diagram showing an example of a method for notifying the OCC index per port.

[0030] Figures 15A - 15CThis is a diagram showing an example of a notification method for OCC using cyclic shift.

[0031] Figure 16 This is a diagram showing an example of a situation where the same reference signal sequence is used among multiple cells.

[0032] Figure 17 This is a diagram showing an example of the multiplication operation of OCC over the OCC decoding range.

[0033] Figure 18 This is a diagram showing an example of the schematic structure of a wireless communication system according to an embodiment.

[0034] Figure 19 This is a diagram showing an example of the structure of a base station according to an embodiment.

[0035] Figure 20 This is a diagram showing an example of the structure of a user terminal according to an embodiment.

[0036] Figure 21 This is a diagram showing an example of the hardware structure of a base station and a user terminal according to an embodiment. Detailed Embodiments

[0037] (CSI-RS)

[0038] In Rel.15, multi-port CSI-RS is multiplexed using at least one of frequency division multiplexing (FDM), time division multiplexing (TDM), and code division multiplexing (CDM (frequency-domain OCC, time-domain OCC)). CSI-RS supports up to 32 ports at most.

[0039] Multi-port CSI-RS is used for, for example, the orthogonality of multi-input multi-output (MIMO) layers. 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.

[0040] In Rel.15, CSI-RS supports up to 32 ports through at least one of time-domain OCC and frequency-domain OCC (up to 4 in the time direction and up to 2 in the frequency direction), FDM, and TDM.

[0041] In Rel.15, for example, CSI-RS is used as at least one of DL RS for channel state information (CSI) acquisition, beam management (BM), beam failure recovery (BFR), and fine tracking of time and frequency. 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.

[0042] Figure 1 FIG. is an example showing the location of CSI-RS 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) location (the location (k-bar, l-bar) of the component resource (CDM group)), the CDM group index, and the location of each resource within the component resource ((RE, symbol), (k', l')). Here, the time / frequency location is the location of the time and frequency resources (component resources) of the CSI-RS corresponding to one port. k-bar is an expression with a bar added to "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.

[0043] As CDM groups, there are no CDM (no CDM (no CDM, N / A)), FD-CDM2, CDM4, and CDM8. Regarding FD-CDM2, by multiplying by a frequency domain (FD)-orthogonal cover code (OCC) of length 2 in units of RE, 2-port CSI-RS (FD2) is multiplexed in the same time and frequency. Regarding CDM4, by multiplying by an FD-OCC of length 2 and a time domain (TD)-OCC of length 2 in units of RE symbol, 4-port CSI-RS (FD2TD2) is multiplexed in the same time and frequency. Regarding CDM8, by multiplying by an FD-OCC of length 2 and a TD-OCC of length 4 in units of RE symbol, 8-port CSI-RS (FD2TD4) is multiplexed in the same time and frequency.

[0044] Figures 2A - 2DThis is a diagram showing an example of FD-OCC and TD-OCC. The sequence of FD-OCC is represented by w f (k’), and the sequence of TD-OCC is represented by w t (k’). Figure 2A Indicates the case where the CDM type is no CDM. Figure 2B Indicates the case where the CDM type is FD-CDM2. Figure 2C Indicates the case where the CDM type is CDM4. Figure 2D Indicates the case where the CDM type is CDM8.

[0045] Figure 3 This is a diagram showing an example of the CSI-RS position based on Figure 1 the number of ports per port. This diagram shows the frequency density, component resource size (size in the frequency direction [RE], size in the time direction [symbol]), and CDM type for each number of ports.

[0046] For example,[[]] Figure 4 represents an example of the resource element (RE) mapping of CSI-RS where the number of ports is set to 32 and the component resource size is set to 2 subcarriers × 2 symbols ( Figure 1 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 (time division multiplexing (TDM)) 2 times in the time domain, so that 4 × 2 component resources are mapped. Then, the CSI-RS in each component resource is multiplied by an FD-OCC of length 2 subcarriers and a TD-OCC of length 2 symbols, so that 4 CSI-RS are multiplexed (code division multiplexing (CDM)) (CDM4 (FD2TD2)). Therefore, 32-port CSI-RS is transmitted in the resource of 1 PRB × 1 time slot.

[0047] The UE assumes that all CSI-RS resources in the resource set are set to the same starting RB, the same number of RBs, and the same CDM type.

[0048] In NR, NZP-CSI-RS is used for time / frequency tracking, CSI calculation, L1-RSRP / SINR calculation, and mobility.

[0049] Sometimes, a UE reports the PMI of neighboring cells of the handover destination just before a handover. In this case, the throughput of the PDSCH deteriorates just before the handover. Since the inter-cell CSI-RSs are not orthogonal, the UE reports the PMI of neighboring cells (other cells) thinking that they are the cells in connection (the serving cell).

[0050] The sequence generation for NZP-CSI-RS is based on a pseudo-random (PN) sequence defined by the following formula.

[0051] [Equation 1]

[0052] Equation (1)

[0053]

[0054] c(n) is defined as follows.

[0055] [Equation 2]

[0056] Equation (2)

[0057]

[0058] N C = 1600. The first m-sequence x 1 (n) is initialized with x1(0) = 1, x1(n) = 0, n = 1, 2,..., 30. The second m-sequence x 2 (n) is initialized with c init . c init differs according to the application destination of the sequence. The pseudo-random sequence generator for the CSI-RS sequence r(m) is initialized at the start of each OFDM symbol with c init as follows.

[0059] [Equation 3]

[0060] Equation (3)

[0061]

[0062] n s,f μ is the time slot number within a radio frame. l is the OFDM symbol number within a time slot. n ID is equal to the scrambling ID parameter (higher layer parameter scramblingID) or the sequence generation configuration parameter (higher layer parameter sequenceGenerationConfig). n symb slot is the number of symbols per time slot.

[0063] For each configured CSI-RS, under the condition of satisfaction, the UE assumes that the sequence r(m) is mapped to the resource element (RE) (k, l) according to the following formula p,μ .

[0064] [Equation 4]

[0065] Equation (4)

[0066]

[0067] The condition is that the resource element (k, l) p,μ exists within the resource block occupied by the configured UE CSI-RS resource. The reference point for k = 0 is subcarrier 0 within common resource block 0. ρ is given by the high layer parameter density within 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) with respect to the reference point. l is the index (position) of the time domain (symbol) with respect to the reference point. p is the antenna port index. μ is the subcarrier spacing setting.

[0068] For NZP-CSI-RS, the UE assumes that β CSIRS > 0. β CSIRS If provided, is the power offset determined by the high layer parameter powerControlOffsetSS within 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 . k' is the subcarrier index of the RE within the CDM group. l' is the symbol index of the RE within the CDM group. N sc RB is the number of subcarriers per RB.

[0069] In addition, the RE positions of CSI-RS are common among cells. Even if different scrambling IDs are set for each cell, there are cases where the inter-sequence interference (inter-cell interference) of CSI-RS becomes high. Generally, it is assumed that the interference of CSI-RS among cells is low, and CSI-RS is mapped to the same RE among multiple cells. Even if different scrambling IDs are set among multiple cells, the finite-length PN sequences are not orthogonal (not orthogonal sequences, pseudo-orthogonal sequences, or non-fully orthogonal sequences), so inter-cell interference is generated.

[0070] In addition, the generated PN sequences are common to all ports.

[0071] Suppose there are 12 CSI-RS ports. In Figure 1 where the row is 12, k 0 = 0, k 1 = 4, k 2 = 8, l 0 = 3, CDM groups #0, #1, #2 as shown in Figure 5 are used. In this case, all 12 ports use the following two PN sequences r l,ns,fμ (m').

[0072] · For the PN sequence r 3,ns,fμ (m') for the third OFDM symbol is [r 3 (0), r 3 (1),...].

[0073] · For the PN sequence r 4,ns,fμ (m') for the fourth OFDM symbol is [r 4 (0), r 4 (1),...].

[0074] For the ports within each CDM group, different samples (values, elements) 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.

[0075] 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.

[0076] In Rel.15, the antenna port number p for CSI-RS transmission, the CDM group index j, and the sequence index (OCC index) s of OCC are associated by the following formula.

[0077] [Equation 5]

[0078] Equation (5)

[0079]

[0080] Here, L is the CDM group size. N is the number of CSI-RS ports. One OCC index s is associated with one FD-OCC and one TD-OCC.

[0081] That is, for ascending port numbers p, first, the OCC index s of CDM group #0 is associated in ascending order, and then the OCC index s of the next CDM group #1 is associated in ascending order. Thus, in Rel.15, the association between each port within a CDM group and the OCC index remains unchanged.

[0082] Among multiple UEs, there are cases where CSI-RS resources are shared / are common. Rel.15 UEs can only generate reference signal sequences of Rel.15 for CSI-RS. It is not clear how to enable the coexistence of existing (e.g., Rel.15) UEs and new (e.g., after Rel.16) UEs. In addition, it is not clear how UEs identify the reference signal sequences for CDM groups.

[0083] It is considered that if at least one of the reference signal sequence of CSI-RS and OCC is not properly determined, the measurement accuracy will be reduced due to the interference of multiple CSI-RSs transmitted in the same RE. If the measurement accuracy of CSI-RS is reduced, there is a concern about the deterioration of system performance.

[0084] Therefore, the inventors of the present invention have come up with a method to reduce the interference between multiple CSI-RSs.

[0085] 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 at least two of them can be combined and applied.

[0086] In the present disclosure, "A / B" and "at least one of A and B" may also be replaced with each other. In the present disclosure, cell, component carrier (CC), carrier, bandwidth part (BWP), and band may also be replaced with each other. In the present disclosure, index, ID, indicator, and resource ID may also be replaced with each other. In the present disclosure, RRC parameter, higher layer parameter, RRC information element (IE), RRC message, RRC signaling, and higher layer signaling may also be replaced with each other.

[0087] In the present disclosure, port, CSI-RS port, and antenna port may also be replaced with each other. In the present disclosure, CSI-RS resource, CSI-RS configuration, and resource for time and frequency of CSI-RS may also be replaced with each other.

[0088] (Wireless communication method)

[0089] In the present disclosure, scrambling ID, scramblingID, sequence generation configuration, sequenceGenerationConfig, cell ID, pseudo cell ID, virtual cell ID, and nID may also be replaced with each other.

[0090] In the present disclosure, resource, CDM group, CSI-RS port, cell, parameter, and index may also be replaced with each other.

[0091] In the present disclosure, the CDM group may 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.

[0092] In the present disclosure, measurement, estimation, calculation, CSI calculation, tracking, L1-RSRP / SINR calculation, and channel estimation related to mobility may also be replaced with each other.

[0093] The UE may also receive information related to CSI-RS. The information related to CSI-RS may also be at least one of existing UE CSI-RS resources, new UE CSI-RS resources, information related to the reference signal sequence (scrambling ID) for each CDM group / each port, information related to OCC for each CDM group / each port, and information related to the OCC decoding range.

[0094] The UE may also measure CSI-RS to which at least one of the following embodiments is applied.

[0095] <Embodiment 1>

[0096] For multiple resources, resource-specific PN sequences may also be generated. PN sequences different between multiple resources may also be generated.

[0097] It is also possible to allocate different scrambling IDs for multiple resources. It is also possible to determine resource-specific c through this scrambling ID init , and generate a resource-specific PN sequence.

[0098] "Embodiment 1-1"

[0099] It is also possible to generate a CDM group-specific PN sequence for a CDM group. It is also possible to generate PN sequences that are different between multiple CDM groups.

[0100] It is also possible to allocate different scrambling IDs for multiple CDM groups. It is also possible to determine CDM group-specific c through this scrambling ID init , and generate a CDM group-specific PN sequence.

[0101] The UE can also determine either Method 1 or 2 according to the following scrambling ID determination method, and determine the scrambling ID for the CSI-RS sequence.

[0102] [Scrambling ID Determination Method 1]

[0103] It is also possible to set the scrambling ID information (scramblingID) for each CDM group through RRC parameters.

[0104] [Scrambling ID Determination Method 2]

[0105] The UE can also identify the scrambling ID specific to each CDM group based on the scrambling ID information (scramblingID) given for the CSI-RS resource and a specific parameter x. For example, as Figure 6 shown, it is also possible to append a scrambling ID offset y in the Figure 1 table. i . The specific parameter x can also be the number of ports. It is also possible that the scrambling ID offset y i is associated with 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 perform an addition operation on the set scrambling ID information and y i to determine the scrambling ID specific to the CDM group.

[0106] Thereby, between multiple CDM groups, the probability of using a CSI-RS sequence with a high correlation 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 with a low correlation with the CSI-RS sequence of an adjacent cell is increased.

[0107] "Embodiment 1-2"

[0108] It is also possible to target CSI-RS ports (antenna ports), and the PN sequences of the CSI-RS ports are generated. It is also possible to generate PN sequences that are different between multiple CSI-RS ports.

[0109] It is also possible to allocate different scrambling IDs for multiple CSI-RS ports. It is also possible to determine the CSI-RS port-specific c init to generate a CSI-RS port-specific PN sequence.

[0110] The UE can also determine the scrambling ID for the CSI-RS sequence by deciding either Method 1 or 2 according to the following scrambling ID determination method.

[0111] [Scrambling ID Determination Method 1]

[0112] It is also possible to set the scrambling ID information (scramblingID) for each CSI-RS port through RRC parameters.

[0113] [Scrambling ID Determination Method 2]

[0114] The UE can also identify the scrambling ID specific to each CSI-RS port based on the scrambling ID information (scramblingID) given for the CSI-RS resource and a specific parameter x. For example, it is also possible to append a scrambling ID offset y Figure 1 in the table of i . The specific parameter x can also be the number of ports. It can also be that the scrambling ID offset y i is associated with 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 perform an addition operation on the set scrambling ID information and y i to determine the scrambling ID specific to the CSI-RS port.

[0115] Thus, the probability of using a CSI-RS sequence with a high correlation with the CSI-RS sequence of an adjacent cell can be reduced among all CSI-RS ports (e.g., 32 ports). In addition, the probability of using a CSI-RS sequence with a low correlation with the CSI-RS sequence of an adjacent cell is increased in at least some of the CSI-RS ports.

[0116] <Embodiment 2>

[0117] In the existing CSI-RS design of 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 3 j (0), r 3 j (4), r 4 j (1), r 4 j (9)] for CDM group 2. In this case, the same PN sequence is used between cells i and j, and the inter-cell interference becomes large.

[0118] In the existing NR, for example, as Figure 7A shown, the association between the PN sequence sample index and the CDM group is common in all cells.

[0119] As Figure 7B shown, it is also possible that the association between the PN sequence sample index and the CDM group is different between multiple cells. This association can also be specified in the specification or set through RRC parameters. The PN sequence sample index associated with one CDM group can also be continuous or non-continuous (it can also be equally spaced).

[0120] It is also possible that the association between the PN sequence sample index and the CSI-RS port is different between multiple cells. This association can also be specified in the specification or set through RRC parameters. The PN sequence sample index associated with one CSI-RS port can also be continuous or non-continuous (it can also be equally spaced).

[0121] It is also possible that the mapping of the PN sequence sample index to the RE is different between multiple cells. This mapping can also be specified in the specification or set through RRC parameters.

[0122] Multiple cells can also use samples with different indexes from the PN sequence.

[0123] It is also possible to use a cell-specific value f(x cell) Perform an addition operation with the sample index m' of the PN sequence. For example, the sample index m' of the PN sequence can also be expressed by the following formula.

[0124] [Mathematical formula 6]

[0125] Equation (6)

[0126]

[0127] f(x cell ) can also be a scrambling ID.

[0128] f(x cell ) can also be a CSI-RS port index.

[0129] f(x cell ) can also be a CDM group index of CSI-RS.

[0130] 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.

[0131] <Embodiment 3>

[0132] Multiple scrambling IDs can also be set by RRC parameters. The number of scrambling IDs can be 2 or other numbers. The multiple scrambling IDs can also be a list of scrambling IDs.

[0133] It is also possible to indicate (switch) one of the multiple set scrambling IDs based on the downlink control information (DCI) for triggering A-CSI-RS or A-CSI report.

[0134] The indication of the scrambling ID based on DCI can also be a new field added in a new version, can also be an interpretation (explanation) of an existing field, or can be 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 carrying the DCI.

[0135] When multiple scrambling IDs (a specific number of scrambling IDs) are set for the CSI-RS resource, the UE can also assume the existence of a new field, and in the case where this is not the case, assume the non-existence of a new field (the size of the new field is 0 bits).

[0136] Multiple scrambling IDs can also be set for each of multiple resources. 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.

[0137] 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.

[0138] <Embodiment 4>

[0139] The UE can also report, through UE capability information, the situation of supporting at least one of the functions described in Embodiments 1 to 3.

[0140] The UE that has reported the situation of supporting the function can also apply the function. The UE that has not reported the situation of supporting the function can also perform Rel.15 operations.

[0141] According to the above Embodiment 4, the UE can operate appropriately according to its capabilities.

[0142] <Embodiment 5>

[0143] The mapping from the PN sequence to the physical resource can also be according to either Scenario 1 or 2.

[0144] <Scenario 1>

[0145] For existing UEs, the PN sequence generated by the existing scrambling ID is mapped to multiple CDM groups. For new UEs, the PN sequence generated by the new scrambling ID j (j = 0, 1,...) (scrambling ID0, scrambling ID1,...) is mapped to CDM group j.

[0146] Figure 8 In the example of, for existing UEs, the samples [r0, r1,...] of the PN sequence generated by the scrambling ID. [r0, r1, r2, r3] are mapped to the resources of CDM group #0, and [r4, r5, r6, r7] are mapped to the resources of CDM group #1.

[0147] For a new UE, samples [r0_0, r0_1, …] of a PN sequence are generated by scrambling ID 0, and samples [r1_0, r1_1, …] of a PN sequence are generated by scrambling ID 1. [r0_0, r0_1, r0_2, r0_3] are mapped to CDM group #0, and [r1_4, r1_5, r1_6, r1_7] are mapped to CDM group #1.

[0148] In this example, each CDM group is composed of REs of 2 symbols × 2 subcarriers. For the REs of one CDM group, the samples of the PN sequence are first mapped in the frequency direction and second mapped in the time direction. For example, for an existing UE, for the REs of CDM group #0, [r0, r1] are mapped in the frequency direction, and [r2, r3] are mapped in the frequency direction by moving in the time direction.

[0149] The direction of mapping the samples of the PN sequence to the REs of the CDM group is not limited to this example. For example, for the REs of one CDM group, the samples of the PN sequence can also be first mapped in the time direction and second mapped in the frequency direction.

[0150] 《Scenario 2》

[0151] For an existing UE, the PN sequence generated by an existing scrambling ID (scrambling ID) is mapped to multiple CDM groups. For a new UE, the PN sequence generated by an existing scrambling ID (scrambling ID) is mapped to CDM group #0, and the PN sequences generated by new scrambling IDs j (j = 1, 2, …) (scrambling ID1, scrambling ID2, …) are mapped to CDM group j.

[0152] Figure 9 In the example of, for an existing UE, samples [r0, r1, …] of a PN sequence are generated by scrambling ID. [r0, r1, r2, r3] are mapped to the resources of CDM group #0, and [r4, r5, r6, r7] are mapped to the resources of CDM group #1.

[0153] For a new UE, samples [r0, r1, …] of a PN sequence are generated by scrambling ID, and samples [r1_1, r1_2, …] of a PN sequence are generated by scrambling ID1. [r0, r1, r2, r3] are mapped to CDM group #0, and [r1_4, r1_5, r1_6, r1_7] are mapped to CDM group #1.

[0154] It is possible to make the PN sequence of CDM group #0 common between an existing UE and a new UE.

[0155] According to the above Embodiment 5, appropriate CSI-RS sequences can be set respectively for existing UEs and new UEs.

[0156] <Embodiment 6>

[0157] By multiplying a reference signal sequence (reference-signal sequence, PN sequence, pseudo-random sequence, reference sequence) for CSI-RS by an OCC, multiple ports can be orthogonalized.

[0158] When multiple CSI-RSs transmitted at the same time and the same frequency use the same reference signal sequence and the multiple CSI-RSs are multiplied by different OCCs, the multiple CSI-RSs are orthogonal to each other. The UE can decompose multiple received signals.

[0159] When multiple CSI-RSs transmitted at the same time and the same frequency use different reference signal sequences and the multiple CSI-RSs are multiplied by different OCCs, the multiple CSI-RSs are not orthogonal to each other. The processing for the UE to decompose multiple received signals becomes complex.

[0160] Figure 10 In the example of, the resources of each of CDM groups #0 and #1 are 4 REs (2 symbols × 2 subcarriers).

[0161] For CDM group #0 of an existing UE and CDM group #0 of a new UE, the same reference signal sequence is mapped. Moreover, CDM group #0 of the existing UE and CDM group #0 of the new UE are multiplied by at least one of different TD-OCCs and different FD-OCCs. In this case, CDM group #0 of the existing UE and CDM group #0 of the new UE are orthogonal, and thus, it is easy for the existing UE and the new UE to perform a process of separating CDM group #0 of the existing UE and CDM group #0 of the new UE.

[0162] For CDM group #1 of an existing UE and DCM group #1 of a new UE, different reference signal sequences are mapped. CDM group #1 of the existing UE and CDM group #1 of the new UE are multiplied by at least one of different TD-OCCs and different FD-OCCs. In this case, CDM group #1 of the existing UE and CDM group #1 of the new UE are not orthogonal, and thus, the process for the existing UE and the new UE to separate CDM group #1 of the existing UE and CDM group #1 of the new UE becomes complex.

[0163] The CSI-RS resources for the new UE can also be at least one of the following time / frequency resources 1 and 2.

[0164] "Time / Frequency Resource 1"

[0165] For new UEs (e.g., those after Rel.16), the CSI-RS resources can also be different from the CSI-RS resources for existing UEs (e.g., those in Rel.15) in at least one of time and frequency ( Figure 11 ). Compared with the case where these CSI-RS resources overlap in time and frequency, the measurement accuracy can be improved.

[0166] The new UE can also comply with any one of the following Rules 1 to 3.

[0167] [Rule 1]

[0168] The new UE may not assume CSI-RS resources that are set to overlap with the CSI-RS resources for existing UEs in time and frequency. The new UE may not assume multiple CSI-RS resources that are set to overlap with each other in time and frequency. The new UE may not assume CSI-RS resources that are set to overlap with the CSI-RS resources used by other UEs in time and frequency.

[0169] [Rule 2]

[0170] The new UE may not assume that the CSI-RS resources for the new UE overlap with the CSI-RS resources for existing UEs in time and frequency. The new UE that is set with multiple CSI-RS resources that repeat (overlap) in time and frequency may also not receive the overlapping part (it can either ignore this part or lower the measurement priority of this part) in one of the part (one of the 2 CSI-RS resources) of the CSI-RS resources.

[0171] This part of the CSI-RS resources can also be the CSI-RS resources for existing UEs. By using the CSI-RS resources for the new UE, good characteristics can be obtained.

[0172] This part of the CSI-RS resources can also be the CSI-RS resources for the new UE. Thus, the base station does not need to stop sending the CSI-RS for existing UEs.

[0173] This part of the CSI-RS resources can also be the A-CSI-RS resources. The base station does not need to stop sending the P-CSI-RS.

[0174] This part of the CSI-RS resources can also be the P-CSI-RS resources. The base station does not need to stop sending the (important) A-CSI-RS that is triggered when necessary.

[0175] This part of CSI-RS resources can also be CSI-RS resources with less restrictive measurement conditions.

[0176] [Rule 3]

[0177] The CSI-RS resources of CDM group #0 in the new UE's CSI-RS resources can also overlap with the existing UE's CSI-RS resources. The CSI-RS resources other than those of CDM group #0 in the new UE's CSI-RS resources may not overlap with the existing UE's CSI-RS resources.

[0178] The CSI-RS resources of CDM group #0 can also be orthogonalized with other CSI-RS resources using a scrambling ID, thereby overlapping with other CSI-RS resources. The difference in energy per resource element (EPRE) (power difference) between each resource element among multiple mutually overlapping CSI-RS resources can also be below a threshold (EPRE can also be equal among these multiple CSI-RS resources).

[0179] "Time / Frequency Resource 2"

[0180] The CSI-RS resources for new (e.g., after Rel. 16) UEs can also overlap with the CSI-RS resources for existing (e.g., Rel. 15) UEs in time and frequency ( Figure 12 ). Compared with the case where these CSI-RS resources do not overlap in at least one of time and frequency, the resource utilization efficiency can be improved.

[0181] OCC can also be applied to the reference signal sequence of CSI-RS according to any one of the following OCC application methods 1 to 3.

[0182] [OCC Application Method 1]

[0183] At least one of FD-OCC and TD-OCC can also be set for each CDM group. Thereby, TD-OCC / FD-OCC can be set independently and flexibly for each CDM group.

[0184] In Rel. 15, the same multiple OCCs are applied to multiple CDM groups. For multiple ports in each CDM group, these multiple OCCs are applied in the order of the OCC index (sequence index).

[0185] Multiple OCC indexes are associated with TD-OCC / FD-OCC. The UE can also be configured with a starting OCC index per CDM group via higher layer signaling. The starting OCC index can also be the OCC index assigned to the first port within a CDM group. In the case where the starting OCC index is not configured / notified, the UE sequentially assigns OCC indexes to ports starting from OCC index 0.

[0186] For each port p (p = 0, 1,..., L-1) within a CDM group with CDM group size L, the UE sequentially assigns OCC index s (0 ≤ i < L) starting from the starting OCC index i (0 ≤ i < L). The OCC index s can also be determined by s = p + i mod L.

[0187] The association between the combination of FD-OCC values and TD-OCC values and the OCC index can also be specified in the specification or can be configured via RRC signaling. Figure 13A In the example, the combination of the FD-OCC value of length 2 and the TD-OCC value of length 2 used in a CDM group of 4 REs is associated with the OCC index. The UE can also, for a CDM group, sequentially assign OCC indexes to ports starting from the starting OCC index and determine the FD-OCC and TD-OCC associated with the OCC index.

[0188] The association between the OCC values that can be used for FD-OCC and TD-OCC and the OCC index can also be specified in the specification or can be configured via RRC signaling. Figure 13B In the example, the OCC values of length 2 for FD-OCC and TD-OCC that can be used for a CDM group of 4 REs are associated with the OCC index. The UE can also, for a CDM group, sequentially assign OCC indexes to ports starting from the starting OCC index and determine the FD-OCC and TD-OCC associated with the OCC index.

[0189] Alternatively, per CDM group, a list of OCC indexes can be specified in the specification or configured via RRC signaling, and at least one OCC index in the list is indicated via MAC CE or DCI per CDM group. Thereby, the OCC can be changed according to the situation.

[0190] The UE can also be configured with at least one of the starting OCC index and the reference signal sequence per CDM group. The reference signal sequence can also be configured via the scrambling ID.

[0191] [OCC Application Method 2]

[0192] For at least one of FD-OCC and TD-OCC, the OCC index may also be set for each port / each CDM group.

[0193] The UE may also be notified by higher layer signaling of a bitmap representing the OCC indices applied to multiple ports / multiple CDM groups respectively. The position of each bit in the bitmap may also correspond to the combination of port / CDM group and OCC index. When a certain bit is 1, the OCC index corresponding to the position of the bit may also be applied to the port / CDM group corresponding to the position of the bit.

[0194] The association between the combination of the values of FD-OCC and TD-OCC and the OCC index may also be specified in the specification and may also be set by RRC signaling. Figure 14A In the example, the combination of the value of FD-OCC with length 2 and the value of TD-OCC with length 2 used in the CDM group of 4 REs is associated with the OCC index. The UE may also be set / notified of the OCC index corresponding to each port of each CDM group and determine the FD-OCC and TD-OCC associated with the OCC index.

[0195] The association between the OCC value that can be used for FD-OCC and TD-OCC and the OCC index may also be specified in the specification and may also be set by RRC signaling. Figure 14B In the example, the OCC values with length 2 of FD-OCC and TD-OCC that can be used for the CDM group of 4 REs are associated with the OCC index. The UE may also be set / notified of the OCC index corresponding to each port of each CDM group and determine the FD-OCC and TD-OCC associated with the OCC index.

[0196] The UE may also be set / notified of the association between the values of FD-OCC and TD-OCC and the OCC index for each CDM group, and may also be set / notified of the association between the OCC value that can be used for FD-OCC and FD-OCC and the OCC index for each CDM group.

[0197] The UE may not be set for FD-OCC and TD-OCC of CDM group #0. When the reference signal sequence of CDM group #0 is based on the existing scrambling ID, the UE may not be set for FD-OCC and TD-OCC of CDM group #0.

[0198] Alternatively, for each port / each CDM group, the list of OCC indices is specified by the specification or set by RRC signaling, and for each port / each CDM group, at least one OCC index in the list is indicated by MAC CE or DCI. Thus, the OCC can be changed according to the situation.

[0199] In at least one of OCC application methods 1 and 2, FD-OCC / TD-OCC can also be determined by cyclic shift.

[0200] The cyclic shift can also be represented by a cyclic shift index. When the length of FD-OCC / TD-OCC is M, the cyclic shift index m is any one of 0, 1,..., M - 1. The cyclic shift corresponding to the cyclic shift index m can also be represented by a phase rotation amount α m = 2πm / M [rad] or 360m / M [degree].

[0201] Figure 15A In the example of, the values of the OCC of length 2 [w(0), w(1)] can also be represented using the cyclic shift index m (for example, m = 0).

[0202] The association between the combination of the cyclic shift values of FD-OCC and the cyclic shift values of TD-OCC and the OCC index can also be specified in the specification or set by RRC signaling. Figure 15B In the example of, the combination of the cyclic shift value corresponding to the FD-OCC of length 2 used in the CDM group of 4 REs and the cyclic shift value corresponding to the TD-OCC of length 2 is associated with the OCC index.

[0203] The association between the cyclic shift value of the OCC that can be used for FD-OCC and TD-OCC and the OCC index can also be specified in the specification or set by RRC signaling. Figure 15C In the example of, the cyclic shift value corresponding to the OCC of length 2 that can be used in the FD-OCC and TD-OCC of the CDM group of 4 REs is associated with the OCC index.

[0204] Alternatively, for each port / each CDM group, the list of cyclic shift indices is specified by the specification or set by RRC signaling, and for each port / each CDM group, at least one cyclic shift index in the list is indicated by MAC CE or DCI. Thus, the OCC can be changed according to the situation.

[0205] The UE can also be set with at least one of the OCC index and the reference signal sequence for each port / each CDM group. The reference signal sequence can also be set by the scrambling ID.

[0206] The UE can also determine the reference signal sequence of the CSI-RS according to at least one of the following reference signal sequence determination methods 1 and 2.

[0207] [Reference signal sequence determination method 1]

[0208] The reference signal sequence corresponding to at least one of a specific CDM group and a specific port of the CSI-RS can also be a specific sequence. For example, the specific sequence can also be all 1s. Thus, the orthogonality based on multiplying the reference signal sequence by the OCC is ensured.

[0209] [Reference signal sequence determination method 2]

[0210] The reference signal sequence corresponding to at least one of a specific CDM group and a specific port of the CSI-RS can also be a sequence obtained by applying a conversion formula to the PN sequence for Rel.15. Regarding the conversion formula, it can also be the multiplication / addition / subtraction / division of a sequence / code appended to the reference signal sequence.

[0211] According to the above Embodiment 6, the OCC for multiple CSI-RSs can be appropriately set.

[0212] <Embodiment 7>

[0213] In one CDM group of a cell, when the CSI-RS of multiple ports uses the same PN sequence or PN sequences with high correlation, the UE can also separate the CSI-RS of these multiple ports through the OCC.

[0214] When the CSI-RS of multiple cells uses the same reference signal sequence (PN sequence) in the same CDM group, the UE cannot separate the CSI-RS of multiple cells. Figure 16 In the example, the PN sequence generated for cell #0 based on the scrambling ID = 0 and the PN sequence generated for cell #1 based on the scrambling ID = 1 are different from each other.

[0215] In CDM group #0 of 4 REs (2 symbols × 2 subcarriers), the same reference signal sequence is allocated to cell #0 and cell #1, and in CDM group #1, different reference signal sequences are allocated to cell #0 and cell #1. The UE cannot separate the CSI-RS of cell #0 and cell #1 in CDM group #0. Thus, the situation where the CSI-RS of cell #0 and #1 cannot be separated occurs with a probability of 1 / 8.

[0216] The UE may also receive CSI-RS to which OCC is applied and multiply it by a specific code that is longer than the OCC.

[0217] It may also be the case that multiplying only by one OCC corresponding to one CDM group is prohibited in at least one of the frequency domain and the time domain.

[0218] The length of the specific code (OCC decoding range) may also be represented by at least one of the number of REs, the number of subcarriers, the number of PRBs, the number of symbols, and the number of CDM groups. The length of the specific code may also be specified in the specification, may be set by RRC signaling, may be reported by UE capability information, or may be set by RRC signaling based on the range of values reported by UE capability information.

[0219] The specific code may also be a frequency-domain code obtained by concatenating N FD-OCCs. The N FD-OCCs may each correspond to N CDM groups (OCC decoding range). The specific code may also be a time-domain code obtained by concatenating N TD-OCCs. The N TD-OCCs may each correspond to N CDM groups (OCC decoding range). N may be 2 or more.

[0220] Figure 17 In the example of, in cells #0 and #1, the reference signal sequences assigned to CDM groups #0 and #1 are the same as Figure 16 the same.

[0221] The UE obtains a specific code by concatenating the FD-OCC of CDM group #0 and the FD-OCC of CDM group #1. By multiplying the received signals in the frequency domain over CDM groups #0 and #1 (OCC decoding range) by the specific code, the UE can separate the CSI-RS of cells #0 and #1.

[0222] If the reference signal sequences over CDM groups #0 and #1 are the same between cells #0 and #1, the UE cannot separate the CSI-RS of cells #0 and #1. In this way, the probability of the situation where the CSI-RS of cells #0 and #1 cannot be separated can be reduced to 1 / 16.

[0223] Thereby, even when the reference signal sequence for each CDM group is not set / indicated, the interference of CSI-RS between cells can be reduced.

[0224] The longer the length of a specific code is made, the more the probability of the reference signal sequences being the same between cells can be reduced, and the more inter-cell interference can be suppressed. On the other hand, by multiplying FD-OCC exceeding the coherent band or TD-OCC over the time of channel variation with the received signal, the orthogonality of the OCC within the cell is broken.

[0225] Under conditions that satisfy the application conditions, the UE can also apply a specific code in the reception of multiple CDM groups. Regarding the application conditions, at least one of the following conditions 1 to 3 can also be set.

[0226] [Condition 1]

[0227] The UE is set / instructed by the network to apply a specific code through RRC signaling / MAC CE / DCI.

[0228] [Condition 2]

[0229] Parameters related to frequency selectivity (e.g., parameters related to CSI, new parameters) are below or above a threshold.

[0230] [Condition 3]

[0231] The UE is at the cell edge. Regarding this condition, specifically, it can be that the received power / received quality of this cell (e.g., the reported values of L1 / L3-RSRP / SINR, CQI / CSI values) is below a threshold, or the received power / received quality of neighboring cells (e.g., the reported values of L1 / L3-RSRP / SINR, CQI / CSI values) is below a threshold, or the UL transmission power is above a threshold, or the power headroom (PHR) is below a threshold.

[0232] According to the above Embodiment 7, the interference of CSI-RS between cells can be reduced.

[0233] (Wireless communication system)

[0234] Hereinafter, the structure of a wireless communication system according to an embodiment of the present disclosure will be described. In this wireless communication system, any one of the wireless communication methods according to the above-described various embodiments of the present disclosure or a combination thereof is used for communication.

[0235] Figure 18It 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), etc.

[0236] 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 also include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NE-DC)), etc.

[0237] 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.

[0238] 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))).

[0239] 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, quantity, 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.

[0240] 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).

[0241] 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 to this. For example, FR1 may correspond to a frequency band higher than FR2.

[0242] Furthermore, the user terminal 20 may also communicate in each CC by using at least one of time division duplex (TDD) and frequency division duplex (FDD).

[0243] 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 used 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.

[0244] Base station 10 can also be connected to the core network 30 via other base stations 10 or directly. The core network 30 can also include, for example, at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), a Next Generation Core (NGC), etc.

[0245] User terminal 20 can also be a terminal that supports at least one of communication methods such as LTE, LTE-A, 5G, etc.

[0246] 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.

[0247] 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.

[0248] 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. shared among the user terminals 20 can also be used.

[0249] In addition, in the wireless communication system 1, as the uplink channel, an uplink shared channel (Physical Uplink Shared Channel (PUSCH)) shared by each user terminal 20, an uplink control channel (Physical Uplink Control Channel (PUCCH)), a random access channel (Physical Random Access Channel (PRACH)), etc. can also be used.

[0250] 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.

[0251] 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.

[0252] 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 replaced by DL data, and the PUSCH can also be replaced by UL data.

[0253] In the detection of the PDCCH, a control resource set (COntrol REsource SET (CORESET)) and a search space can also be used. The CORESET corresponds to the resource for searching for DCI. The search space corresponds to the search area and search method of PDCCH candidates (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.

[0254] A search space may also correspond to PDCCH candidates corresponding to one or more aggregation levels. One or more search spaces may also be referred to as a search space set. Additionally, in the present disclosure, "search space", "search space set", "search space configuration", "search space set configuration", "CORESET", "CORESET configuration", etc. may also be used interchangeably with each other.

[0255] Uplink control information (Uplink Control Information (UCI)) including at least one of channel state information (Channel State Information (CSI)), delivery confirmation information (e.g., which may also be 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.

[0256] Additionally, in the present disclosure, the downlink, uplink, etc. may also be expressed without "link". Furthermore, it may also be expressed as not having "Physical" at the beginning of various channels.

[0257] 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.

[0258] 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.

[0259] 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.

[0260] (Base station)

[0261] Figure 19 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.

[0262] In addition, in this example, the functional blocks of the characteristic parts in this embodiment are mainly shown, and it may 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.

[0263] The control unit 110 implements overall control of the base station 10. The control unit 110 can be constituted by a controller, a control circuit, etc. that can be described based on common knowledge in the technical field related to the present disclosure.

[0264] 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, sequence, 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.

[0265] 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. described based on the common knowledge in the technical field related to the present disclosure.

[0266] 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.

[0267] The transmission and reception antenna 130 can be composed of an antenna described based on the common knowledge in the technical field related to the present disclosure, such as an array antenna, etc.

[0268] 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.

[0269] 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.

[0270] The transmission / reception unit 120 (transmission processing unit 1211) can also perform processing of the Packet Data Convergence Protocol (PDCP) layer, Radio Link Control (RLC) layer processing (e.g., RLC retransmission control), Medium Access Control (MAC) layer processing (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.

[0271] The transmission / reception unit 120 (transmission processing unit 1211) can also perform transmission processing such as channel coding (which may also include error correction coding), modulation, mapping, filter 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.

[0272] The transmission / reception unit 120 (RF unit 122) can also perform modulation to the radio frequency band, filter processing, amplification, etc. on the baseband signal, and transmit the radio frequency band signal via the transmission / reception antenna 130.

[0273] On the other hand, the transmission / reception unit 120 (RF unit 122) can also perform amplification, filter processing, demodulation to the baseband signal, etc. on the radio frequency band signal received through the transmission / reception antenna 130.

[0274] The transmission / reception unit 120 (reception processing unit 1212) can also perform reception processing such as analog-to-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (if necessary), filter processing, demapping, demodulation, decoding (which may also 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.

[0275] The transmission / reception 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.

[0276] 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 acquire, transmit, etc. user data (user plane data), control plane data, etc. for the user terminal 20.

[0277] In addition, the transmission unit and the reception unit of the base station 10 in the present disclosure may also be constituted by at least one of the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission path interface 140.

[0278] The transmission / reception unit 120 may also transmit setting information for generating channel state information (CSI)-reference signal (RS) sequences different between multiple resources. Each of the above multiple resources may 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 above setting information.

[0279] The control unit 110 may also determine, for the ports of at least one code division multiplexing (CDM) group for channel state information (CSI)-reference signal (RS), a reference signal sequence for the above CSI-RS, an orthogonal cover code (OCC) for the above CSI-RS, a specific code for decoding the above OCC, and at least one of resources that do not overlap with a specific CSI-RS resource. The transmission / reception unit 120 may also transmit information related to the above CSI-RS based on the above determination.

[0280] (User Equipment)

[0281] Figure 20 FIG. 7 is an example showing the structure of a user equipment according to an embodiment. The user equipment 20 includes a control unit 210, a transmission / reception unit 220, and a transmission / reception antenna 230. In addition, one or more of the control unit 210, the transmission / reception unit 220, and the transmission / reception antenna 230 may be provided respectively.

[0282] In addition, in this example, the functional blocks of the characteristic parts in this embodiment are mainly shown, and it can also be assumed that the user equipment 20 also has other functional blocks required for wireless communication. A part of the processing of each unit described below may also be omitted.

[0283] The control unit 210 implements overall control of the user equipment 20. The control unit 210 can be composed of a controller, a control circuit, etc. described based on common knowledge in the technical field related to the present disclosure.

[0284] The control unit 210 may also control signal generation, mapping, etc. The control unit 210 may also control transmission / reception, measurement, etc. using the transmission / reception unit 220 and the transmission / reception antenna 230. The control unit 210 may also generate data, control information, sequences, etc. to be transmitted as signals and forward them to the transmission / reception unit 220.

[0285] The transmission / reception unit 220 may also include a baseband unit 221, an RF unit 222, and a measurement unit 223. The baseband unit 221 may also 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. described based on common knowledge in the technical field related to the present disclosure.

[0286] The transmission / reception unit 220 may be configured as an integrated transmission / reception unit, or may be composed of a transmission unit and a reception unit. The transmission unit may also be composed of the transmission processing unit 2211 and the RF unit 222. The reception unit may also be composed of the reception processing unit 2212, the RF unit 222, and the measurement unit 223.

[0287] The transmitting and receiving antenna 230 can be constituted by an antenna that can be described based on common knowledge in the technical field related to the present disclosure, such as an array antenna or the like.

[0288] The transmitting and receiving unit 220 can also receive the above-mentioned downlink channels, synchronization signals, downlink reference signals, etc. The transmitting and receiving unit 220 can also transmit the above-mentioned uplink channels, uplink reference signals, etc.

[0289] The transmitting and receiving unit 220 can also use digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), etc. to form at least one of a transmitting beam and a receiving beam.

[0290] The transmitting and receiving unit 220 (transmitting 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), etc. on the data, control information, etc. obtained from the control unit 210, and generate a bit string to be transmitted.

[0291] The transmitting and receiving unit 220 (transmitting processing unit 2211) can also perform transmitting processing such as channel coding (which can also include error correction coding), modulation, mapping, filter 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.

[0292] In addition, regarding whether to apply DFT processing, it can also be based on the setting of transform precoding. For a certain channel (e.g., PUSCH), when the transform precoding is activated (enabled), the transmitting and receiving unit 220 (transmitting processing unit 2211) can also perform DFT processing as the above-mentioned transmitting processing in order to transmit the channel using the DFT-s-OFDM waveform. In other cases, the transmitting and receiving unit 220 (transmitting processing unit 2211) can also not perform DFT processing as the above-mentioned transmitting processing.

[0293] The transmitting and receiving unit 220 (RF unit 222) can also perform modulation to the radio frequency band, filter processing, amplification, etc. on the baseband signal, and transmit the radio frequency band signal via the transmitting and receiving antenna 230.

[0294] On the other hand, the transmitting and receiving unit 220 (RF unit 222) can also perform amplification, filter processing, demodulation to the baseband signal, etc. on the radio frequency band signal received through the transmitting and receiving antenna 230.

[0295] 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), filter processing, demapping, demodulation, decoding (which may also include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing on the acquired baseband signal, and acquire user data and the like.

[0296] 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 measure reception 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.

[0297] 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.

[0298] It may also be that 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 is 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 above setting information.

[0299] The above setting information may also include scrambling IDs that are different for the above plurality of resources. The above plurality of CSI-RS sequences may also be based on the above different scrambling IDs.

[0300] The above setting information may also include specific parameters for the CSI-RS resources. The control unit 210 may also determine different scrambling IDs for the above plurality of resources based on the above specific parameters. The above plurality of CSI-RS sequences may also be based on the above different scrambling IDs.

[0301] The above setting information may also include a plurality of scrambling IDs. The control unit 210 may also determine one scrambling ID from the above plurality of scrambling IDs based on downlink control information. The above plurality of CSI-RS sequences may also be based on the above one scrambling ID.

[0302] The transmitting and receiving unit 220 may also receive information related to a channel state information (CSI)-reference signal (RS). The control unit 210 may also, based on the above information, determine, for ports of at least one code division multiplexing (CDM) group, a reference signal sequence for the above CSI-RS, an orthogonal cover code (OCC) for the above CSI-RS, a specific code for decoding the above OCC, and at least one of resources that do not overlap with a specific CSI-RS resource.

[0303] The time and frequency resources of the above CDM group may also not overlap with the CSI-RS resources of Release 15.

[0304] The time and frequency resources of the above CDM group may also overlap with the CSI-RS resources of Release 15. The above information may also indicate the OCC for each of at least one of the above CDM group and CSI-RS ports.

[0305] The above specific code may also be longer than the length of the OCC applied to the above CDM group. The above control unit 210 may also multiply the received signals across multiple CDM groups by the above specific code.

[0306] (Hardware Structure)

[0307] 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. Furthermore, there is no particular limitation on the implementation method of each functional block. That is, each functional block may be implemented by a single device physically or logically combined, or may be implemented by two or more physically or logically separated devices directly or indirectly (e.g., by wire, wireless, etc.) connected with these multiple devices. The functional block may also be implemented by combining the above single device or the above multiple devices with software.

[0308] Here, in terms of 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 (assigning), etc., but 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 one of them is as described above, and the implementation method is not particularly limited.

[0309] For example, a base station, a user terminal, etc. in an embodiment of the present disclosure may also function as a computer that processes the wireless communication method of the present disclosure. Figure 21 FIG. is an example showing the hardware structure of the base station and the user terminal according to one embodiment. The above-mentioned 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.

[0310] 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.

[0311] For example, only one processor 1001 is shown, but there may be multiple processors. In addition, the processing may be executed by one processor, or may be executed simultaneously, sequentially, or by other means by two or more processors. In addition, the processor 1001 may also be implemented by one or more chips.

[0312] 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 implementing it.

[0313] The processor 1001, for example, operates the operating system 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, etc. 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.

[0314] 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 a 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.

[0315] The memory 1002 may also be a computer-readable recording medium, for example, constituted by at least one of 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.

[0316] The storage 1003 may also be a computer-readable recording medium, for example, constituted by at least one of 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.

[0317] 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 separately implemented by a transmitting unit 120a (220a) and a receiving unit 120b (220b).

[0318] 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 an 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 an output to the outside. In addition, the input device 1005 and the output device 1006 may also have an integrated structure (e.g., a touch panel).

[0319] 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.

[0320] 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 using this hardware. For example, the processor 1001 may also be implemented by at least one of these hardware.

[0321] (Variant)

[0322] 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.

[0323] 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.

[0324] Here, the numerology may also refer to communication parameters applied in at least one of 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 the transmitter-receiver in the time domain, etc.

[0325] A time slot may also be composed of one or more symbols (orthogonal frequency division multiplexing (Orthogonal Frequency Division Multiplexing (OFDM)) symbols, single carrier frequency division multiple access (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.

[0326] 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 a PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot may also be referred to as a PDSCH (PUSCH) mapping type B.

[0327] 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.

[0328] 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 the 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.

[0329] Here, a TTI refers to, for example, the minimum 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.

[0330] A TTI may also be a transmission time unit for data packets (transport blocks), code blocks, codewords, etc. that have 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 transport block, code block, codeword, etc. is actually mapped may also be shorter than the TTI.

[0331] 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 minimum time unit for scheduling. In addition, the number of time slots (mini-slot numbers) constituting the minimum time unit of this scheduling may also be controlled.

[0332] 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.

[0333] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) can also be replaced with a TTI having a time length exceeding 1 ms, and a short TTI (e.g., a shortened TTI, etc.) can also be replaced with a TTI having a TTI length less than that of the long TTI and more than 1 ms.

[0334] 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.

[0335] In addition, an RB may also include one or more symbols in the time domain, and may also be the length of a time slot, a mini-slot, a subframe, or a TTI. A TTI, a subframe, etc. may also be composed of one or more resource blocks respectively.

[0336] 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.

[0337] 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 a subcarrier and a symbol.

[0338] 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 numbered additionally within that BWP.

[0339] A BWP may also include a ULBWP (BWP for UL) and a DLBWP (BWP for DL). For a UE, one or more BWPs may also be set within one carrier.

[0340] At least one of the set BWPs may be active, and the UE may not assume to transmit and receive specific channels / signals outside the active BWP. In addition, "cell", "carrier", etc. in the present disclosure may also be replaced with "BWP".

[0341] In addition, structures such as the above-mentioned radio frames, subframes, time slots, mini time slots, and symbols are merely illustrative. 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 symbols included in a time slot or mini time slot, the number of RBs, the number of subcarriers included in an RB, and the number of symbols, symbol length, Cyclic Prefix (CP) length, etc. within a TTI can be changed in various ways.

[0342] Furthermore, the information, parameters, etc. described in this disclosure can be represented by absolute values, relative values with respect to a specific value, or can also be represented by corresponding other information. For example, radio resources can also be indicated by a specific index.

[0343] In this disclosure, the names used for parameters, etc. are not restrictive names in all aspects. Furthermore, mathematical expressions using these parameters, etc. can also be different from those clearly disclosed in this disclosure. Various channels (such as 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 restrictive names in all aspects.

[0344] The information, signals, etc. described in this disclosure can also be represented using any one of various different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be mentioned throughout the above description can also be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0345] In addition, information, signals, etc. can be output in at least one of the following directions: from a higher layer to a lower layer, and from a lower layer to a higher layer. Information, signals, etc. can also be input and output via multiple network nodes.

[0346] The input and output information, signals, etc. can be stored in a specific location (such as a memory), or can be managed using a management table. The input and output information, signals, etc. can be overwritten, updated, or appended. The output information, signals, etc. can also be deleted. The input information, signals, etc. can also be sent to other devices.

[0347] Notification of information is not limited to the manners / embodiments described in the present disclosure, and other methods can also be used. For example, notification of information in the present disclosure can 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 combinations thereof.

[0348] In addition, 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), etc. In addition, RRC signaling can also be referred to as an RRC message, and can also be, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration (RRC Connection Re - setting) message, etc. In addition, MAC signaling can also be notified, for example, using a MAC Control Element (MAC CE).

[0349] In addition, notification of specific information (e.g., notification of "is X") is not limited to explicit notification, and can also be performed implicitly (e.g., by not performing the notification of the specific information, or by notification of other information).

[0350] The determination can be made by a value represented by one bit (0 or 1), can also be made by a true - false value (Boolean value) represented by true or false, and can also be made by a numerical comparison (e.g., comparison with a specific value).

[0351] 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, etc.

[0352] 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 cable, fiber optic cable, twisted pair, 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.

[0353] Terms such as "system" and "network" used in this disclosure can be used interchangeably. "Network" can also represent a device (e.g., a base station) included in the network.

[0354] 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.

[0355] In the present disclosure, terms such as "Base Station (BS)", "radio base station", "fixed station", "NodeB", "eNB (eNodeB)", "gNB (gNodeB)", "access point", "Transmission Point (TP)", "Reception Point (RP)", "Transmission / Reception Point (TRP)", "panel", "cell", "sector", "cell group", "carrier", "component carrier" can be used interchangeably. There are also cases where a base station is referred to by terms such as macro cell, small cell, femto cell, pico cell, etc.

[0356] A base station can accommodate one or more (e.g., three) cells. When a base station accommodates multiple cells, the entire 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 (e.g., a small indoor base station (Remote Radio Head (RRH))). Terms such as "cell" or "sector" refer to a part or the whole of the coverage area of at least one of a base station and a base station subsystem that provides communication services within that coverage range.

[0357] In the present disclosure, terms such as "Mobile Station (MS)", "user terminal", "user device (User Equipment (UE))", "terminal" can be used interchangeably.

[0358] There are also cases where a mobile station is referred to by terms such as subscriber station, mobile unit, subscriber unit, radio unit, remote unit, mobile device, radio device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, hand set, user agent, mobile client, client, or several other suitable terms.

[0359] 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. In addition, 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). In addition, at least one of the base station and the mobile station also includes a device that does not necessarily move during communication operations. For example, at least one of the base station and the mobile station may also be an Internet of Things (IoT) device such as a sensor.

[0360] In addition, the base station in the present disclosure may also be replaced by 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. In addition, terms such as "uplink" and "downlink" may also be replaced by terms corresponding to inter-terminal communication (e.g., "side"). For example, an uplink channel, a downlink channel, etc. may also be replaced by a side channel.

[0361] Similarly, the user terminal in the present disclosure may also be replaced by 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.

[0362] In the present disclosure, operations performed by the base station may sometimes be performed by its upper node according to circumstances. Apparently, in a network including one or more network nodes having a base station, various operations 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.

[0363] 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, various step elements are presented in the illustrated order, but are not limited to the specific order presented.

[0364] 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) (xG (x is an integer or a decimal, for example)), 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) and applied.

[0365] 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".

[0366] Any reference to an element using designations such as "first", "second", etc. used in this disclosure does not comprehensively 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 be prior to the second element in some form.

[0367] The term "determining" as used in this disclosure encompasses various operations in some cases. For example, "determining" can also be a case where judging, calculating, computing, processing, deriving, investigating, looking up (searching, inquiring) (such as searching in a table, database, or other data structure), ascertaining, etc. are regarded as performing "determining".

[0368] In addition, "determining" can also be a case where receiving (e.g., receiving information), transmitting (e.g., transmitting information), input, output, accessing (e.g., accessing data in a memory), etc. are regarded as performing "determining".

[0369] In addition, "determining" can also be a case where resolving, selecting, choosing, establishing, comparing, etc. are regarded as performing "determining". That is to say, "determining" can also be a case where some actions are regarded as performing "determining".

[0370] In addition, "determining" can also be replaced by "assuming", "expecting", "considering", etc.

[0371] The "maximum transmit power" described in this disclosure can mean the maximum value of the transmit power, or it can mean the nominal UE maximum transmit power, or it can also mean the rated UE maximum transmit power.

[0372] Terms such as "connected" and "coupled" used in this disclosure, or all 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 them. For example, "connected" can also be replaced by "access".

[0373] 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 with wavelengths in the radio frequency domain, microwave region, and optical (both visible and invisible) regions is used as several non-limiting and non-inclusive examples to "connect" or "couple" with each other.

[0374] In this disclosure, the term "A is different from B" can also mean "A and B are different from each other". In addition, this term can also mean "A and B are respectively different from C". Terms such as "separated" and "combined" can also be interpreted as "different" in the same way.

[0375] In this disclosure, when using "include", "including", and their variants, these terms, like the term "comprising", are of an inclusive meaning. Furthermore, the term "or" used in this disclosure does not mean exclusive or.

[0376] In this disclosure, for example, in the case where articles are added through translation such as a, an, and the in English, this disclosure can also include the case where the nouns following these articles are in the plural form.

[0377] 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 invention determined based on the description in the claims. Therefore, the description of the present disclosure is for illustrative purposes only and does not carry any restrictive meaning for the invention related to the present disclosure.

Claims

1. A terminal, comprising: a receiving unit that receives information related to a channel state information-reference signal, i.e., CSI-RS; and a control unit that, based on the information, determines at least one of a reference signal sequence for the CSI-RS, an orthogonal cover code for the CSI-RS, i.e., OCC, and a specific code for decoding the OCC for ports of at least one code division multiplexing group, i.e., CDM group; the time and frequency resources of the CDM group overlap with the CSI-RS resources of Release 15; the information represents the OCC of each of at least one of the CDM group and the CSI-RS ports.

2. The terminal according to claim 1, wherein, the specific code corresponds to an OCC decoding range longer than the length of the OCC applied to the CDM group; the control unit multiplies the received signals over a plurality of CDM groups by the specific code.

3. The terminal according to claim 1, wherein, the control unit obtains the specific code by concatenating the time-domain OCCs of a plurality of CDM groups for a plurality of CDM groups.

4. The terminal according to claim 1, wherein, the control unit obtains the specific code by concatenating the frequency-domain OCCs of a plurality of CDM groups for a plurality of CDM groups.

5. A wireless communication method for a terminal, comprising: a step of receiving information related to a channel state information-reference signal, i.e., CSI-RS; and a step of, based on the information, determining at least one of resources of the CSI-RS that do not overlap with a specific CSI-RS resource, a reference signal sequence for the CSI-RS, an orthogonal cover code for the CSI-RS, i.e., OCC, and a specific code for decoding the OCC for ports of at least one code division multiplexing group, i.e., CDM group; the time and frequency resources of the CDM group overlap with the CSI-RS resources of Release 15; the information represents the OCC of each of at least one of the CDM group and the CSI-RS ports.

6. A base station, comprising: a control unit that determines at least one of a reference signal sequence for the CSI-RS, an orthogonal cover code for the CSI-RS, i.e., OCC, and a specific code for decoding the OCC for ports of at least one code division multiplexing group, i.e., CDM group for the channel state information-reference signal, i.e., CSI-RS; and a transmitting unit that transmits information related to the CSI-RS based on the determination; the time and frequency resources of the CDM group overlap with the CSI-RS resources of Release 15; the information represents the OCC of each of at least one of the CDM group and the CSI-RS ports.

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