User terminal and wireless communication method

Abstract

A user terminal involved in one embodiment of the present disclosure is characterized in that it has: a receiving unit that receives a downlink shared channel (physical downlink shared channel (Physical Downlink Shared Channel (PDSCH))) from multiple transmission / reception points (Transmission / Reception Point (TRP)); and a control unit that determines a second identifier used for data scrambling of the PDSCH based on a first identifier used in initialization of a pseudo-random sequence generator when specific conditions are met, and the pseudo-random sequence generator is used for generation of a specific reference signal sequence. According to one embodiment of the present disclosure, the scrambling sequence of the PDSCH when multiple TRPs are used can be appropriately determined.

Description

Technical Field

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

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

[0003] Successor systems of LTE (for example, also referred to as fifth generation mobile communication system (5G), 5G+(plus), New Radio (NR), 3GPP Rel.15 and later, etc.) are also being studied.

[0004] Prior art literature

[0005] Non-patent literature

[0006] Non-patent document 1: 3GPP TS 36.300 V8.12.0 “Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 (Release 8)”, April 2010 Summary of the invention

[0007] Problems to be solved by the invention

[0008] In future wireless communication systems (e.g., NR), one or more transmission / reception points (Transmission / Reception Point (TRP)) (multi-TRP) are being studied to perform DL transmission (e.g., Physical Downlink Shared Channel (PDSCH) transmission) to user terminals (User Equipment (UE)).

[0009] In NR, in order to identify the transmission source, destination, etc., smooth the transmission power characteristics of the signal, etc., the base station applies scrambling to the signal (e.g., data) sent to the UE to randomize the transmission signal as much as possible.

[0010] However, in the existing Rel-15 NR specification, since multiple TRPs are not taken into account, there is no provision for determining the scrambling of each PDSCH sent from multiple TRPs. Therefore, there is a concern that, in compliance with the current NR specification, spatial diversity gain, high-rank transmission, etc. when using multiple TRPs cannot be properly achieved, and the increase in communication throughput is suppressed.

[0011] Therefore, one of the objects of the present disclosure is to provide a user terminal and a wireless communication method that can appropriately determine the scrambling sequence of the PDSCH when using multiple TRPs.

[0012] Means for solving problems

[0013] A user terminal involved in one embodiment of the present invention is characterized in that it has: a receiving unit that receives a downlink shared channel (physical downlink shared channel (Physical Downlink Shared Channel (PDSCH))) from multiple transmission / reception points (Transmission / Reception Point (TRP)); and a control unit that determines a second identifier used for data scrambling of the PDSCH based on a first identifier used in initialization of a pseudo-random sequence generator when specific conditions are met, and the pseudo-random sequence generator is used to generate a sequence of a specific reference signal.

[0014] Effects of the Invention

[0015] According to one embodiment of the present disclosure, it is possible to appropriately determine the scrambling sequence of the PDSCH when utilizing multiple TRPs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figures 1A to 1D This is a diagram showing an example of a multi-TRP scenario.

[0017] Figure 2 This is a diagram showing a portion of the content of the RRC information element "PDSCH-Config" involved in Implementation 2-1.

[0018] Figure 3 This is a diagram showing a portion of the content of the RRC information element "PDSCH-Config" involved in Implementation 2-2.

[0019] Figure 4 This is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment.

[0020] Figure 5 This is a diagram showing an example of the configuration of a base station according to an embodiment.

[0021] Figure 6 This is a diagram showing an example of a configuration of a user terminal according to an embodiment.

[0022] Figure 7 This is a diagram showing an example of the hardware configuration of a base station and a user terminal involved in one embodiment. DETAILED DESCRIPTION

[0023] (Multiple TRP)

[0024] In NR, one or more transmission / reception points (Transmission / Reception Point (TRP)) (multi-TRP) using one or more panels (multi-panels) are being studied to perform DL transmission to the UE (for example, Physical Downlink Shared Channel (PDSCH) transmission).

[0025] In addition, multiple TRPs may correspond to the same cell identifier (cell identifier (ID)) or different cell IDs. The cell ID may be a physical cell ID or a virtual cell ID.

[0026] Figures 1A to 1D The following are diagrams showing an example of a multi-TRP scenario. In these examples, it is assumed that each TRP is capable of sending 4 different beams, but this is not limited to this.

[0027] Figure 1AAn example is shown in which only one TRP (in this example, TRP1) among multiple TRPs transmits to the UE (may also be referred to as single mode, single TRP, etc.). In this case, TRP1 transmits both control signals (Physical Downlink Control Channel (PDCCH)) and data signals (PDSCH) to the UE.

[0028] Figure 1B An example of a situation in which only one TRP (TRP1 in this example) among multiple TRPs sends a control signal to the UE and the multiple TRPs send data signals (also referred to as single master mode) is shown. The UE receives each PDSCH sent from the multiple TRPs based on one downlink control information (Downlink Control Information (DCI)).

[0029] Figure 1C An example of a situation in which each of the multiple TRPs sends a part of a control signal to the UE and the multiple TRPs send data signals (also referred to as a master slave mode) is shown. Alternatively, part 1 of the control signal (DCI) may be sent through TRP1, and part 2 of the control signal (DCI) may be sent through TRP2. Part 2 of the control signal may also depend on part 1. Based on these parts of the DCI, the UE receives each PDSCH sent from the multiple TRPs.

[0030] Figure 1D An example of a situation in which multiple TRPs send independent control signals to the UE respectively and the multiple TRPs send data signals (also referred to as a multi-master control mode) is shown. Alternatively, a first control signal (DCI) may be sent through TRP1, and a second control signal (DCI) may be sent through TRP2. Based on these DCIs, the UE receives each PDSCH sent from the multiple TRPs.

[0031] When using a DCI pair such as Figure 1B In the case of scheduling multiple PDSCHs from multiple TRPs, the DCI can also be called a single DCI (single PDCCH). Figure 1D When multiple PDSCHs from multiple TRPs are scheduled separately, these multiple DCIs can also be called multiple DCIs (multiple PDCCHs).

[0032] Based on such a multi-TRP scenario, more flexible transmission control using channels of good quality can be performed.

[0033] Different code words (Code Word (CW)) and different layers may be transmitted from each TRP of the multi-TRP. As one method of multi-TRP transmission, non-coherent joint transmission (NCJT) is being studied.

[0034] In NCJT, for example, TRP1 performs modulation mapping on a first codeword and transmits a first PDSCH using a first precoding for a first number of layers (e.g., 2 layers) through layer mapping. In addition, TRP2 performs modulation mapping on a second codeword and transmits a second PDSCH using a second precoding for a second number of layers (e.g., 2 layers) through layer mapping. These first PDSCH and second PDSCH can also be conceived as being independent of quasi-co-location (QCL: Quasi-Co-Location) (not quasi-co-located).

[0035] In addition, multiple PDSCHs that are NCJTed can also be defined as partially or completely overlapping with respect to at least one of the time domain and the frequency domain. That is, the first PDSCH from the first TRP and the second PDSCH from the second TRP can also overlap with respect to at least one of the time and frequency resources.

[0036] (Scrambled)

[0037] In NR, in order to identify the transmission source, destination, etc., smooth the transmission power characteristics of the signal, etc., the base station applies scrambling to the signal (e.g., data) sent to the UE to randomize the transmission signal as much as possible.

[0038] For example, in the existing Rel-15 NR, the UE may also assume that scrambling is applied to a block of bits (or a bit string) of a codeword sent in the PDSCH before modulation (and the PDSCH may also be demodulated based on this assumption).

[0039] The scrambling sequence applied to the codeword of the PDSCH may be generated using a scrambling sequence generator. In addition, the scrambling sequence may be, for example, a Gold sequence of length 31.

[0040] In the present disclosure, scrambling and scrambling may also be used interchangeably. For example, scrambling sequence and scrambling sequence may also be used interchangeably.

[0041] The generator can also use the c shown in Equation 1 init and is initialized.

[0042] (Formula 1)c init =n RNTI 2 15 +q·2 14 +n ID

[0043] Where n RNTI It may also correspond to the Radio Network Temporary Identifier (RNTI) associated with the PDSCH. q may also correspond to the index of the codeword (e.g., 0 or 1). ID It may be equivalent to the value of an ID (which may also be called data scrambling ID, scrambling ID, etc.) used to initialize data scrambling of the PDSCH.

[0044] Under certain conditions, n ID It may be equivalent to the higher-level parameters related to the data scrambling ID of PDSCH (for example, the RRC parameter “dataScramblingIdentityPDSCH”). Otherwise, n ID It can also be equivalent to a cell identifier (Identifier) ​​(ID).

[0045] The certain condition may be, for example, the following condition: "dataScramblingIdentityPDSCH" is set, and the RNTI is a specific type of RNTI (cell RNTI, etc.), and the PDSCH is not scheduled using DCI format 1_0 in the common search space.

[0046] In addition, in the present disclosure, indexes, IDs, indicators, etc. may also be interchangeable.

[0047] In Rel-15 NR, the RRC parameter "dataScramblingIdentityPDSCH" can take an integer value greater than or equal to 0 and less than or equal to 1023.

[0048] However, in the existing Rel-15 NR specification, since multiple TRPs are not taken into consideration, there is no provision for determining the scrambling of each PDSCH sent from multiple TRPs. Therefore, there is a concern that, in compliance with the current NR specification, spatial diversity gain, high-rank transmission, etc. when using multiple TRPs cannot be properly achieved, and the increase in communication throughput is suppressed.

[0049] Therefore, the inventors of the present invention have come up with a method for appropriately determining the scrambling sequence of the PDSCH of multiple TRPs. According to one embodiment of the present invention, an identifier (ID) associated with the scrambling sequence of each PDSCH can be determined for each TRP.

[0050] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. The wireless communication methods according to the embodiments may be applied individually or in combination.

[0051] In addition, in the present disclosure, panel, uplink (UL) transmission entity, TRP, demodulation reference signal (DMRS) port, DMRS port group, code division multiplexing (CDM) group, group associated with a specific reference signal, control resource set (CORESET) group, CORESET, PDSCH, codeword, base station, etc. can also be replaced with each other. In addition, panel identifier (ID) and panel can also be replaced with each other. TRP ID and TRP can also be replaced with each other.

[0052] In addition, in the present disclosure, NCJT, NCJT using multiple TRPs, multiple PDSCHs using NCJT, multiple PDSCHs, multiple PDSCHs from multiple TRPs, etc. can also be replaced with each other.

[0053] In the present disclosure, the higher layer signaling may be, for example, any one of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, etc., or a combination thereof.

[0054] MAC signaling may also use, for example, MAC Control Element (MAC CE), MAC Protocol Data Unit (MAC Protocol Data Unit (PDU)), etc. Broadcast information may also be, for example, Master Information Block (MIB), System Information Block (SIB), minimum system information (Remaining Minimum System Information (RMSI)), Other System Information (Other System Information (OSI)), etc.

[0055] (Wireless Communication Method)

[0056] <First Embodiment>

[0057] In the first implementation, the UE calculates the value of c based on equation 1. init The scrambling sequence of multiple PDSCHs is determined by the formula obtained by expansion, modification, etc.

[0058] In short, the first implementation mode can be classified as follows, which will be described below:

[0059] Implementation 1-1: for n ID To expand;

[0060] Implementation 1-2: In c init Adding a term corresponding to the information of the scrambling sequence explicitly specified by the field of the DCI to the formula;

[0061] Implementation 1-3: In c init Add an item corresponding to the information of the scrambling sequence implicitly specified by the field of DCI to the formula.

[0062] [Implementation Method 1-1]

[0063] In implementation mode 1-1, when certain conditions are met, the UE may also determine the data scrambling ID of the PDSCH based on the scrambling ID of a specific reference signal (for example, n in formula 1). ID ).

[0064] The specific reference signal may be, for example, a DMRS of a PDSCH, a DMRS of a PDCCH, a DMRS of a PBCH, a Channel State Information Reference Signal (CSI-RS), etc. The DMRS of the PDSCH in this embodiment may also be replaced by other reference signals.

[0065] In addition, the scrambling ID of the reference signal may also refer to the scrambling ID used in the initialization of a pseudo-random sequence generator, which is used to generate the sequence of the reference signal. In addition, the pseudo-random sequence may also be a Gold sequence of length 31, for example.

[0066] The UE may also use the value provided by the RRC parameter "dataScramblingIdentityPDSCH" as described above as the data scrambling ID of the PDSCH when a transmission configuration indicator state (TCI state) is indicated or assumed for PDSCH reception. In addition, the TCI state in the present disclosure may also be replaced by QCL, TCI, etc.

[0067] In addition, the TCI state for PDSCH reception may be indicated by a TCI state field included in the DCI that schedules the PDSCH.

[0068] The assumption of a TCI state for PDSCH reception may also be performed in a situation where the TCI state for the PDSCH cannot be clearly determined, such as a situation where the TCI state is not indicated by DCI, a situation where the time from DCI reception to PDSCH reception is short and the TCI state cannot be switched, etc. The assumed TCI state may also be referred to as a default TCI state.

[0069] In addition, in the present disclosure, there is a situation where, even in a case where multiple TRPs are set for PDSCH reception, the UE may be instructed or assumed to be in a TCI state for PDSCH reception (that is, there is a situation where transmission and reception with multiple TRPs is instantly changed to transmission and reception with a single TRP).

[0070] In the case where multiple TCI states are indicated or assumed for PDSCH reception, the UE may also determine the data scrambling ID of the PDSCH based on the scrambling ID of a specific reference signal. For example, in this case, if the first scrambling ID of the DMRS for the PDSCH is set, the UE may also use the remainder obtained by dividing the first scrambling ID by 1024 (=mod(first scrambling ID, 1024)) as the data scrambling ID of the PDSCH.

[0071] Furthermore, if a second scrambling ID for the DMRS of the PDSCH is set, the UE may use the remainder obtained by dividing the second scrambling ID by 1024 (=mod(second scrambling ID, 1024)) as the data scrambling ID of the PDSCH.

[0072] In addition, in the present disclosure, regarding multiple TCI states for PDSCH reception, the PDSCH (in other words, multiple PDSCHs) can also be considered as a PDSCH that uses at least one identical codeword to transmit the same or different codewords.

[0073] In addition, the first scrambling ID may also be equivalent to the parameter ("scramblingID0") of the scrambling ID included in the RRC information element "DMRS-DownlinkConfig" related to the DMRS of the PDSCH. The second scrambling ID may also be equivalent to the parameter ("scramblingID1") of another scrambling ID included in the "DMRS-DownlinkConfig". In Rel-15 NR, scramblingID0 and scramblingID1 can take values ​​greater than 0 and less than 65535.

[0074] When both the first scrambling ID and the second scrambling ID are set, the UE may decide which ID to use as the data scrambling ID of the PDSCH based on the TRP of at least one of the PDSCH and the DCI that schedules the PDSCH.

[0075] For example, for a PDSCH sent from a certain TRP (e.g., TRP1), the UE may also determine the data scrambling ID of the PDSCH based on the first scrambling ID of the DMRS used for the PDSCH, and for a PDSCH sent from another TRP (e.g., TRP2), the UE may determine the data scrambling ID of the PDSCH based on the second scrambling ID of the DMRS used for the PDSCH.

[0076] That is, the UE may also assume that the first scrambling ID of the DMRS of the PDSCH can be used as the data scrambling ID of the PDSCH of TRP1, and assume that the second scrambling ID of the DMRS of the PDSCH can be used as the data scrambling ID of the PDSCH of TRP2.

[0077] In addition, the UE may also determine which of the first scrambling ID and the second scrambling ID to use as the data scrambling ID of the PDSCH based on the DMRS sequence initialization field included in the DCI for scheduling the PDSCH. For example, when the value (e.g., 0 or 1) of the DMRS sequence initialization field corresponds to the first (second) scrambling ID, the UE may also assume that the first (second) scrambling ID is used to initialize the DMRS sequence of the PDSCH, and use the first (second) scrambling ID as the data scrambling ID of the PDSCH.

[0078] In addition, in the case where the first scrambling ID and the second scrambling ID are not set, the UE can also assume that the data scrambling ID of the PDSCH of the TRP corresponding to the scrambling ID that has not been set is a value provided by the cell ID or the RRC parameter "dataScramblingIdentityPDSCH".

[0079] In addition, even in the case where a TCI state is indicated or assumed for PDSCH reception, when at least one of the above-mentioned first scrambling ID and the second scrambling ID of the DMRS of the PDSCH is set, the UE can determine the data scrambling ID of the PDSCH based on at least one of them (for example, according to mod (the first or second scrambling ID, 1024)).

[0080] In addition, "1024" in this embodiment may be other values.

[0081] [Implementation Method 1-2]

[0082] In implementation 1-2, for example, when multiple TRPs (or multiple PDSCHs) are set, the UE may use the following Formula 2 instead of Formula 1 as the formula for initializing the scrambling sequence applied in the PDSCH.

[0083] (Formula 2)c init =n RNTI 2 15 +q·2 14 +n ID +n ID2

[0084] Among them, nID2 This corresponds to an item corresponding to the information of the scrambling sequence explicitly specified through the field of the DCI that schedules the PDSCH.

[0085] For example, the UE may also assume that, when multiple TRPs are set for PDSCH reception, the DCI format (eg, DCI format 1_1) for scheduling the PDSCH includes a field for a scrambling ID representing a data scrambling sequence for the PDSCH.

[0086] The UE may also determine n in equation 2 based on the value of the above field when multiple TCI states for PDSCH reception are indicated or assumed. ID2 The value of .

[0087] The UE may determine n in formula 2 based on the value of the above field when a TCI state for PDSCH reception is indicated or assumed. ID2 The value of can also be assumed to be that the above field is not used to determine the data scrambling ID of the PDSCH (in this case, the data scrambling ID of the PDSCH can also be determined as described in Formula 1 or Implementation 1-1).

[0088] In addition, regarding the size of the above-mentioned field, in the case of a single TRP (or when one TCI state is indicated or assumed), it can also be X bits; in the case of multiple TRPs (or when multiple TCI states are indicated or assumed), it can also be X bits or X*TRP number of bits.

[0089] [Implementation Method 1-3]

[0090] In Embodiment 1-3, the scrambling sequence of the PDSCH may also be initialized based on Formula 2 in the same manner as in Embodiment 1-2. The difference from Embodiment 1-2 is that n ID2 This corresponds to an item corresponding to the information of the scrambling sequence implicitly specified by the field of the DCI that schedules the PDSCH.

[0091] The DCI field may also be an existing DCI field indicating other information, for example, any of the following fields or a combination thereof:

[0092] Hybrid Automatic Repeat reQuest (HARQ) process number (HARQ Process Number (HPN)) field (may also be referred to as the HARQ process ID field);

[0093] Antenna port(s) field (or the number of CDM groups, DMRS CDM groups with no data, or DMRS ports corresponding to the value of this field);

[0094] DMRS sequence initialization field;

[0095] PUCCH resource indicator field;

[0096] TPC command field for the scheduled PUCCH;

[0097] Downlink assignment index field;

[0098] Frequency domain resource assignment field;

[0099] Time domain resource assignment field.

[0100] In Embodiments 1-2 and 1-3, when N DCI fields are considered, n in Formula 2 ID2 Can also be replaced by n ID2 +……+n ID(N+1) In addition, each term in Formula 2 can also be multiplied by an arbitrary coefficient.

[0101] According to the first embodiment described above, for example, it is possible to appropriately determine the scrambling sequence of each PDSCH sent from multiple TRPs.

[0102] <Second Embodiment>

[0103] In the second implementation, the UE directly uses c in formula 1 init , determine the scrambling sequence of multiple PDSCHs. Among them, the data scrambling ID of the PDSCH (for example, n in formula 1) ID ) is equivalent to one of the multiple high-level parameters set for the data scrambling ID of PDSCH.

[0104] In the existing Rel-15 NR, only one "dataScramblingIdentityPDSCH" is set for each BWP (or PDSCH configuration ("PDSCH-Config" information element)), but in the second embodiment, multiple higher-layer parameters of the data scrambling ID of the PDSCH are set.

[0105] The multiple high-level parameters of the PDSCH data scrambling IDs that are set may also correspond to different TRPs. The correspondence between the high-level parameters and the TRPs may be specified by high-level signaling or by specifications (for example, a certain parameter corresponds to TRP1, other parameters correspond to TRP2, etc.).

[0106] In short, the second implementation can be classified as follows, which will be described below:

[0107] Embodiment 2-1: In addition to setting “dataScramblingIdentityPDSCH” to the UE, other higher layer parameters related to the data scrambling ID of one PDSCH are also set to the UE.

[0108] · Embodiment 2-2: New higher layer parameters related to data scrambling IDs of multiple PDSCHs are configured for the UE.

[0109] [Implementation Method 2-1]

[0110] Figure 2 This is a diagram showing a portion of the content of the RRC information element "PDSCH-Config" involved in Implementation 2-1. Figure 2 It is described using ASN.1 (Abstract Syntax Notation One) notation.

[0111] The RRC information element “PDSCH-Config” may include a parameter “dataScramblingIdentityPDSCH.” The parameter “dataScramblingIdentityPDSCH” may be a value related to the data scrambling ID of the PDSCH and may be represented by an integer greater than or equal to 0 and less than or equal to 1023.

[0112] The RRC information element "PDSCH-Config" may also include a parameter "dataScramblingIdentityPDSCH_R-16". The parameter "dataScramblingIdentityPDSCH_R-16" may also be a value related to the data scrambling ID of the PDSCH, and is represented by an integer greater than 0 and less than 1023. In addition, "dataScramblingIdentityPDSCH_R-16" is intended to represent a parameter that can be imported into the NR of Rel-16, but may also be imported into the NR of Rel-17 or later, and its name is not limited thereto.

[0113] Even when "dataScramblingIdentityPDSCH_R-16" is set, for the PDSCH sent from a single TRP (also referred to as a single PDSCH), the UE can determine the data scrambling ID of the PDSCH based on "dataScramblingIdentityPDSCH".

[0114] Even when "dataScramblingIdentityPDSCH_R-16" is set, for PDSCH (multi-PDSCH) sent from multiple TRPs, the UE can determine the data scrambling ID of the PDSCH of a certain TRP (for example, TRP1) based on "dataScramblingIdentityPDSCH", and determine the data scrambling ID of the PDSCH of other TRPs (for example, TRP2) based on "dataScramblingIdentityPDSCH_R-16".

[0115] [Implementation Method 2-2]

[0116] Figure 3 This is a diagram showing a portion of the content of the RRC information element "PDSCH-Config" involved in Implementation 2-2. Figure 3 It is described using ASN.1 notation.

[0117] The RRC information element “PDSCH-Config” may include a parameter “dataScramblingIdentityPDSCH.” The parameter “dataScramblingIdentityPDSCH” may be a value related to the data scrambling ID of the PDSCH and may be represented by an integer greater than or equal to 0 and less than or equal to 1023.

[0118] The RRC information element "PDSCH-Config" may also include the parameter "dataScramblingIdentityPDSCH_R-16". The parameter "dataScramblingIdentityPDSCH_R-16" may also be a sequence of values ​​related to the data scrambling ID of the PDSCH. The "sequence" here is one of the fields indicating the type of the ASN.1 object (ASN.1object), which may also be referred to as a sequence type.

[0119] The parameter "dataScramblingIdentityPDSCH_R-16" may also represent the timing of maxTRPs integer values. Here, maxTRPs may also be the maximum value of the number of TRPs set for the UE. In addition, maxTRPs may also be replaced by the number of TRPs set for the UE. maxTRPs may also be a number greater than 2, for example.

[0120] Even when "dataScramblingIdentityPDSCH_R-16" is set, for the PDSCH (single PDSCH) transmitted from a single TRP, the UE can determine the data scrambling ID of the single PDSCH based on "dataScramblingIdentityPDSCH".

[0121] In other words, the UE may also assume that, when a TCI state is indicated or assumed to be used for PDSCH reception, the data scrambling ID of the PDSCH is set through "dataScramblingIdentityPDSCH".

[0122] When "dataScramblingIdentityPDSCH_R-16" is set, for PDSCH (multi-PDSCH) transmitted from multiple TRPs, the UE can also determine the data scrambling ID of the multi-PDSCH based on "dataScramblingIdentityPDSCH_R-16".

[0123] In other words, the UE may also assume that, when multiple TCI states are indicated or assumed for PDSCH reception, the data scrambling ID of the PDSCH is set using "dataScramblingIdentityPDSCH_R-16".

[0124] In addition, the i-th value of "dataScramblingIdentityPDSCH_R-16" may correspond to the i-th TRP from the smaller (or larger) TRP index. Which TRP the i-th value of "dataScramblingIdentityPDSCH_R-16" corresponds to may be determined by the specification or may be set by higher-layer signaling as described above.

[0125] about Figure 3, an example has been described in which the UE dedicates "dataScramblingIdentityPDSCH" to a single PDSCH (single TRP) and dedicates "dataScramblingIdentityPDSCH_R-16" to multiple PDSCHs (multiple TRPs), but is not limited to this.

[0126] For example, the UE may also use "dataScramblingIdentityPDSCH" for a single PDSCH, and may also use it for a certain TRP (e.g., TRP1) of multiple PDSCHs. In this case, the UE may also use a value selected from multiple values ​​included in "dataScramblingIdentityPDSCH_R-16" for other TRPs (e.g., TRP2) of multiple PDSCHs.

[0127] Furthermore, even when “dataScramblingIdentityPDSCH” is set, the UE can use a value selected from a plurality of values ​​included in “dataScramblingIdentityPDSCH_R-16” for a single PDSCH.

[0128] According to the second embodiment described above, for example, it is possible to appropriately determine the scrambling sequence of each PDSCH sent from multiple TRPs.

[0129] <Other Implementation Methods>

[0130] The equations 1 and 2 in the above-mentioned embodiments are examples, and the equations used for initializing the data scrambling sequence of the PDSCH are not limited to these.

[0131] In addition, in each of the above-mentioned embodiments, dynamic switching from multiple TRPs to a single TRP can also be performed.

[0132] Even in the case where multiple TRPs are set, when a TCI state for PDSCH reception is indicated or assumed (which may also be referred to as instantaneously becoming a single TRP), the UE may assume a single TRP and generate or determine the data scrambling ID for the PDSCH. In this case, it may also be assumed that the UE uses any of the TCI states for multiple TRPs.

[0133] Even when multiple TRPs are set, when multiple TCI states are indicated or assumed for PDSCH reception, the UE can also generate or determine the data scrambling ID of the PDSCH by assuming multiple TRPs. Here, the value of the i-th scrambling ID generated or determined can also be equivalent to the i-th TRP from the smaller side (or larger side) of the TRP index.

[0134] In the present disclosure, a single PDCCH (DCI) may also be referred to as a PDCCH (DCI) of a first scheduling type (e.g., scheduling type A (or type 1)). In addition, a multiple PDCCH (DCI) may also be referred to as a PDCCH (DCI) of a second scheduling type (e.g., scheduling type B (or type 2)).

[0135] In the present disclosure, a single PDCCH may also be conceived to be supported when multiple TRPs utilize an ideal backhaul. Multiple PDCCHs may also be conceived to be supported when multiple TRPs utilize a non-ideal backhaul.

[0136] In addition, the ideal backhaul may also be referred to as DMRS port group type 1, reference signal association group type 1, antenna port group type 1, etc. The non-ideal backhaul may also be referred to as DMRS port group type 2, reference signal association group type 2, antenna port group type 2, etc. The names are not limited to these.

[0137] In the present disclosure, which TRP the DCI is used to schedule can also be explicitly specified through the bit field of the DCI. In addition, when at least one of the CORESET, search space set, QCL, TCI state, etc. corresponding to the TRP is pre-set, the UE can also determine which TRP the DCI is used to schedule based on at least one of the CORESET, search space set, QCL, TCI state, etc. detected for the DCI.

[0138] (Wireless Communication System)

[0139] Hereinafter, a configuration of a wireless communication system according to an embodiment of the present disclosure will be described. In the wireless communication system, communication is performed using one of the wireless communication methods according to the above-mentioned embodiments of the present disclosure or a combination thereof.

[0140] Figure 4 1 is a diagram showing an example of a schematic structure of a wireless communication system involved in one embodiment. The wireless communication system 1 may also be a system that implements communication using Long Term Evolution (LTE) standardized by the Third Generation Partnership Project (3GPP), the fifth generation mobile communication system New Radio (5G NR), and the like.

[0141] In addition, the wireless communication system 1 can also support dual connectivity between multiple radio access technologies (Radio Access Technology) (RAT) (Multi-RAT Dual Connectivity (MR-DC)). MR-DC can also include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA))) and NR (E-UTRA-NR Dual Connectivity (E-UTRA-NR Dual Connectivity (EN-DC))), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NR-E-UTRA Dual Connectivity (NE-DC))), etc.

[0142] In EN-DC, the base station (eNB) of LTE (E-UTRA) is the master node (Master Node (MN)), and the base station (gNB) of NR is the secondary node (Secondary Node (SN)). In NE-DC, the base station (gNB) of NR is the MN, and the base station (eNB) of LTE (E-UTRA) is the SN.

[0143] The wireless communication system 1 can also support dual connectivity between multiple base stations within the same RAT (for example, dual connectivity (NR-NR Dual Connectivity (NN-DC)) where both MN and SN are NR base stations (gNB)).

[0144] The wireless communication system 1 may also include: a base station 11 that forms a macro cell C1 with a relatively wide coverage, and a base station 12 (12a-12c) that is configured in the macro cell C1 and forms a small cell C2 that is narrower than the macro cell C1. The user terminal 20 may also be located in at least one cell. The configuration and number of each cell and the user terminal 20 are not limited to the method shown in the figure. Hereinafter, when the base stations 11 and 12 are not distinguished, they are collectively referred to as the base station 10.

[0145] The user terminal 20 may be connected to at least one of the plurality of base stations 10. The user terminal 20 may use at least one of carrier aggregation (CA) using a plurality of component carriers (CC) and dual connectivity (DC).

[0146] Each CC may also be included in at least one of the first frequency band (Frequency Range 1 (FR1)) and the second frequency band (Frequency Range 2 (FR2)). The macro cell C1 may also be included in FR1, and the small cell C2 may also be included in FR2. For example, FR1 may be a frequency band below 6 GHz (lower than 6 GHz (sub-6 GHz)), and FR2 may be a frequency band higher than 24 GHz (higher than 24 GHz (above-24 GHz)). In addition, the frequency bands and definitions of FR1 and FR2 are not limited to this. For example, FR1 may also correspond to a frequency band higher than FR2.

[0147] Furthermore, the user terminal 20 may perform communication in each CC using at least one of time division duplex (TDD) and frequency division duplex (FDD).

[0148] Multiple base stations 10 may also be connected by wire (e.g., optical fiber based on Common Public Radio Interface (CPRI)), X2 interface, etc.) or wirelessly (e.g., NR communication). For example, when NR communication between base stations 11 and 12 is used as a backhaul, the base station 11 equivalent to the upper station may also be referred to as an Integrated Access Backhaul (IAB) donor, and the base station 12 equivalent to a relay station may also be referred to as an IAB node.

[0149] The base station 10 may also be connected to the core network 30 via other base stations 10 or directly. The core network 30 may also include, for example, at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), a Next Generation Core (NGC), and the like.

[0150] The user terminal 20 may also be a terminal that supports at least one of communication modes such as LTE, LTE-A, and 5G.

[0151] In the wireless communication system 1, a wireless access method based on orthogonal frequency division multiplexing (OFDM) may be used. For example, in at least one of the downlink (DL) and the uplink (UL), cyclic prefix OFDM (CP-OFDM), discrete Fourier transform spread OFDM (DFT-s-OFDM), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access (SC-FDMA), etc. may be used.

[0152] The radio access scheme may also be referred to as a waveform. In addition, in the wireless communication system 1, other radio access schemes (for example, other single-carrier transmission schemes, other multi-carrier transmission schemes) may be applied to the UL and DL radio access schemes.

[0153] In the wireless communication system 1, as downlink channels, a downlink shared channel (Physical Downlink Shared Channel (PDSCH)) shared by each user terminal 20, a broadcast channel (Physical Broadcast Channel (PBCH))), a downlink control channel (Physical Downlink Control Channel (PDCCH)) and the like may be used.

[0154] In addition, in the wireless communication system 1, as uplink channels, an uplink shared channel (Physical Uplink Shared Channel (PUSCH)) shared by each user terminal 20), an uplink control channel (Physical Uplink Control Channel (PUCCH))), a random access channel (Physical Random Access Channel (PRACH)) and the like may be used.

[0155] The PDSCH is used to transmit user data, high-layer control information, system information block (SIB), etc. The PUSCH is also used to transmit user data, high-layer control information, etc. In addition, the PBCH is also used to transmit the master information block (MIB).

[0156] The lower layer control information may also be transmitted via the PDCCH. The lower layer control information may include, for example, downlink control information (Downlink Control Information (DCI)) including scheduling information of at least one of the PDSCH and the PUSCH.

[0157] In addition, the DCI for scheduling PDSCH may also be referred to as DL allocation, DL DCI, etc., and the DCI for scheduling PUSCH may also be referred to as UL grant, UL DCI, etc. In addition, PDSCH may also be replaced by DL data, and PUSCH may also be replaced by UL data.

[0158] In the detection of PDCCH, the control resource set (CORESET) and the search space can also be used. CORESET corresponds to the resources for searching DCI. The search space corresponds to the search area and search method of PDCCH candidates. 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.

[0159] 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. In addition, the "search space", "search space set", "search space setting", "search space set setting", "CORESET", "CORESET setting" and the like in the present disclosure may also be interchangeable.

[0160] Uplink control information (uplink control information (UCI)) including at least one of channel state information (CSI), delivery confirmation information (e.g., also called hybrid automatic repeat request confirmation (HARQ-ACK), ACK / NACK, etc.), and scheduling request (Scheduling Request (SR)) can also be transmitted through PUCCH. Random access preamble code for establishing connection with a cell can also be transmitted through PRACH.

[0161] In the present disclosure, downlink, uplink, etc. may be expressed without "link". In addition, various channels may be expressed without "Physical" at the beginning.

[0162] 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 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.

[0163] The synchronization signal may be, for example, at least one of a primary synchronization signal (PSS) and a secondary synchronization signal (SSS). A signal block including SS (PSS, SSS) and PBCH (and DMRS for PBCH) may also be referred to as an SS / PBCH block, SS block (SS Block (SSB)), etc. In addition, SS, SSB, etc. may also be referred to as reference signals.

[0164] In addition, in the wireless communication system 1, as an uplink reference signal (Uplink Reference Signal (UL-RS)), a measurement reference signal (Sounding Reference Signal (SRS)), a demodulation reference signal (DMRS), etc. can also be transmitted. In addition, DMRS can also be called a user terminal specific reference signal (UE-specific Reference Signal).

[0165] (Base Station)

[0166] Figure 5 1 is a diagram showing an example of a structure of a base station involved in one embodiment. The base station 10 includes a control unit 110, a transmitting and receiving unit 120, a transmitting and receiving antenna 130, and a transmission path interface (transmission line interface) 140. In addition, the control unit 110, the transmitting and receiving unit 120, the transmitting and receiving antenna 130, and the transmission path interface 140 may each be provided with more than one.

[0167] In addition, in this example, the functional blocks of the characteristic parts of this embodiment are mainly shown, and the base station 10 may also be assumed to have other functional blocks required for wireless communication. Part of the processing of each unit described below may be omitted.

[0168] The control unit 110 controls the entire base station 10. The control unit 110 can be composed of a controller, a control circuit, and the like that are described based on the common knowledge in the technical field to which the present disclosure relates.

[0169] The control unit 110 may also control signal generation, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may also control transmission and reception, measurement, etc. using the transmission and reception unit 120, the transmission and reception antenna 130, and the transmission path interface 140. The control unit 110 may also generate data, control information, sequences, etc. to be sent as signals, and forward them to the transmission and reception unit 120. The control unit 110 may also perform call processing (setting, release, etc.) of communication channels, state management of the base station 10, management of wireless resources, etc.

[0170] The transmitting and receiving unit 120 may also include a baseband unit 121, a radio frequency (RF) unit 122, and a measuring unit 123. The baseband unit 121 may also include a transmitting processing unit 1211 and a receiving processing unit 1212. The transmitting and receiving unit 120 may be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter (phase shifter), a measuring circuit, a transmitting and receiving circuit, etc., which are described based on the public knowledge in the technical field involved in the present disclosure.

[0171] The transmitting and receiving unit 120 may be configured as an integrated transmitting and receiving unit, or may be configured by a transmitting unit and a receiving unit. The transmitting unit may also be configured by a transmitting processing unit 1211 and an RF unit 122. The receiving unit may also be configured by a receiving processing unit 1212, an RF unit 122, and a measuring unit 123.

[0172] The transmitting / receiving antenna 130 can be constituted by an antenna described based on the common knowledge in the technical field involved in the present disclosure, such as an array antenna.

[0173] The transmitting and receiving unit 120 may also transmit the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transmitting and receiving unit 120 may also receive the above-mentioned uplink channel, uplink reference signal, etc.

[0174] The transmitting and receiving unit 120 may also use digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), etc. to form at least one of a transmitting beam and a receiving beam.

[0175] The sending and receiving unit 120 (sending processing unit 1211), for example, may also perform Packet Data Convergence Protocol (PDCP) layer processing, Radio Link Control (RLC) layer processing (for example, RLC retransmission control), Medium Access Control (MAC) layer processing (for example, HARQ retransmission control), etc. on the data and control information obtained from the control unit 110 to generate a bit string to be sent.

[0176] The transmitting and receiving unit 120 (transmitting processing unit 1211) can also perform channel coding (which may also include error correction coding), modulation, mapping, filtering, discrete Fourier transform (DFT)) processing (as needed), inverse fast Fourier transform (IFFT)) processing, precoding, digital-to-analog conversion and other transmission processing on the bit string to be sent, and output a baseband signal.

[0177] The transmitting and receiving unit 120 (RF unit 122 ) may perform modulation, filtering, amplification, etc. on the baseband signal to a radio frequency band, and transmit the signal in the radio frequency band via the transmitting and receiving antenna 130 .

[0178] On the other hand, the transmitting and receiving unit 120 (RF unit 122 ) may perform amplification, filtering, demodulation into a baseband signal, etc. on the signal in the radio frequency band received by the transmitting and receiving antenna 130 .

[0179] The sending and receiving unit 120 (receiving processing unit 1212) can also apply analog-to-digital conversion, fast Fourier transform (FFT) processing, inverse discrete Fourier transform (IDFT) processing (as needed), filtering processing, demapping, demodulation, decoding (which may also include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the obtained baseband signal to obtain user data, etc.

[0180] The transmitting and receiving unit 120 (measuring unit 123) may also implement measurements related to the received signal. For example, the measuring unit 123 may also perform radio resource management (Radio Resource Management (RRM)) measurements, channel state information (CSI) measurements, etc. based on the received signal. The measuring unit 123 may also measure received power (e.g., reference signal received power (Reference Signal Received Power (RSRP))), received quality (e.g., reference signal received quality (Reference Signal Received Quality (RSRQ)), signal to interference plus noise ratio (Signal to Interference plus Noise Ratio (SINR)), signal to noise ratio (Signal to Noise Ratio (SNR))), signal strength (e.g., received signal strength indicator (ReceivedSignal Strength Indicator (RSSI))), propagation path information (e.g., CSI), etc. The measurement results may also be output to the control unit 110.

[0181] The transmission path interface 140 can also send and receive signals (return signaling) between devices included in the core network 30, other base stations 10, etc., and can also obtain and transmit user data (user plane data) and control plane data for the user terminal 20.

[0182] In addition, the transmission unit and the reception unit of the base station 10 in the present disclosure may also be constituted by at least one of the transmission and reception unit 120 , the transmission and reception antenna 130 , and the transmission path interface 140 .

[0183] In addition, the transmission / reception unit 120 may transmit the PDSCH to the user terminal 20. The control unit 110 may control so that the PDSCH overlaps with a PDSCH transmitted from another base station 10 in at least one of time and frequency resources.

[0184] (User Terminal)

[0185] Figure 6 2 is a diagram showing an example of a configuration of a user terminal according to an embodiment. The user terminal 20 includes a control unit 210, a transmission / reception unit 220, and a transmission / reception antenna 230. In addition, the control unit 210, the transmission / reception unit 220, and the transmission / reception antenna 230 may each be provided in one or more pieces.

[0186] In addition, in this example, the functional blocks of the characteristic parts in this embodiment are mainly shown, and the user terminal 20 may also be assumed to have other functional blocks required for wireless communication. Part of the processing of each unit described below may be omitted.

[0187] The control unit 210 controls the entire user terminal 20. The control unit 210 can be composed of a controller, a control circuit, and the like that are described based on the common knowledge in the technical field to which the present disclosure relates.

[0188] The control unit 210 may also control signal generation, mapping, etc. The control unit 210 may also control transmission and reception, measurement, etc. using the transmission and reception unit 220 and the transmission and reception antenna 230. The control unit 210 may also generate data, control information, sequences, etc. to be transmitted as signals, and forward them to the transmission and reception unit 220.

[0189] The transmitting and receiving unit 220 may also include a baseband unit 221, an RF unit 222, and a measuring unit 223. The baseband unit 221 may also include a transmitting processing unit 2211 and a receiving processing unit 2212. The transmitting and receiving unit 220 may be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measuring circuit, a transmitting and receiving circuit, etc., which are described based on the public knowledge in the technical field involved in the present disclosure.

[0190] The transmitting and receiving unit 220 may be configured as an integrated transmitting and receiving unit, or may be configured by a transmitting unit and a receiving unit. The transmitting unit may also be configured by a transmitting processing unit 2211 and an RF unit 222. The receiving unit may also be configured by a receiving processing unit 2212, an RF unit 222, and a measuring unit 223.

[0191] The transmitting / receiving antenna 230 can be constituted by an antenna described based on the common knowledge in the technical field involved in the present disclosure, such as an array antenna.

[0192] The transmitting and receiving unit 220 may also receive the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transmitting and receiving unit 220 may also transmit the above-mentioned uplink channel, uplink reference signal, etc.

[0193] The transmitting and receiving unit 220 may also use digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), etc. to form at least one of a transmitting beam and a receiving beam.

[0194] The sending and receiving unit 220 (sending processing unit 2211) can also perform PDCP layer processing, RLC layer processing (for example, RLC retransmission control), MAC layer processing (for example, HARQ retransmission control), etc. on the data, control information, etc. obtained from the control unit 210 to generate a bit string to be sent.

[0195] The transmitting and receiving unit 220 (transmitting processing unit 2211) can also perform channel coding (which may also include error correction coding), modulation, mapping, filtering, DFT processing (as needed), IFFT processing, precoding, digital-to-analog conversion and other transmission processing on the bit string to be sent, and output a baseband signal.

[0196] In addition, whether to apply DFT processing may also be based on the setting of transform precoding. For a certain channel (e.g., PUSCH), when transform precoding is activated (enabled), the transmitting and receiving unit 220 (transmitting processing unit 2211) may also perform DFT processing as the above-mentioned transmission processing in order to transmit the channel using a DFT-s-OFDM waveform. Otherwise, the transmitting and receiving unit 220 (transmitting processing unit 2211) may also perform DFT processing as the above-mentioned transmission processing without performing DFT processing.

[0197] The transmitting and receiving unit 220 (RF unit 222 ) may also perform modulation, filtering, amplification, etc. on the baseband signal to a radio frequency band, and transmit the signal in the radio frequency band via the transmitting and receiving antenna 230 .

[0198] On the other hand, the transmitting and receiving unit 220 (RF unit 222 ) may perform amplification, filtering, demodulation into a baseband signal, etc. on the signal in the radio frequency band received by the transmitting and receiving antenna 230 .

[0199] The sending and receiving unit 220 (receiving processing unit 2212) can also apply analog-to-digital conversion, FFT processing, IDFT processing (as needed), filtering processing, demapping, demodulation, decoding (which may also include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the obtained baseband signal to obtain user data, etc.

[0200] The transmitting and receiving unit 220 (measuring unit 223) may also perform measurements related to the received signal. For example, the measuring unit 223 may also perform RRM measurements, CSI measurements, etc. based on the received signal. The measuring unit 223 may also measure received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc. The measurement results may also be output to the control unit 210.

[0201] In addition, the transmitting unit and the receiving unit of the user terminal 20 in the present disclosure may also be constituted by at least one of the transmitting and receiving unit 220 and the transmitting and receiving antenna 230 .

[0202] In addition, the transmitting and receiving unit 220 may also receive a first PDSCH (Physical Downlink Shared Channel) from a first transmission / reception point (TRP) and a second PDSCH from a second TRP that overlaps with the first PDSCH in terms of at least one of time and frequency resources. In other words, the transmitting and receiving unit 220 may also receive multiple PDSCHs.

[0203] When certain conditions are met, the control unit 210 may determine a second identifier for data scrambling of the PDSCH based on a first identifier used in initializing a pseudo-random sequence generator used to generate a sequence of a specific reference signal.

[0204] The specific reference signal may also be a demodulation reference signal (DeModulation Reference Signal (DMRS)) of the PDSCH. For example, the first identifier may also be equivalent to a parameter of a scrambling ID (at least one of "scramblingID0", "scramblingID1", etc.) included in an RRC information element "DMRS-DownlinkConfig" related to the DMRS of the PDSCH.

[0205] The second identifier may also be equivalent to n in Formula 1, for example. ID , n in formula 2 ID 、n ID2 Wait for at least one.

[0206] When a plurality of transmission configuration indicator states, namely, TCI states (Transmission Configuration Indication states), for the PDSCH reception are indicated or assumed, the control unit 210 determines the second identifier based on the first identifier.

[0207] In the case of a transmission configuration indicator state, i.e., a TCI state (Transmission Configuration Indication state), indicated or assumed for the PDSCH reception, the control unit 210 may also determine the second identifier based on higher-layer parameters related to an identifier for data scrambling of the PDSCH (for example, the RRC parameter "dataScramblingIdentityPDSCH" also defined in Rel-15 NR).

[0208] When multiple first identifiers are set (for example, when both "scramblingID0" and "scramblingID1" are set), the control unit 210 may also determine which of the multiple first identifiers to use for determining the second identifier based on the TRP corresponding to the PDSCH.

[0209] (Hardware Structure)

[0210] In addition, the block diagram used in the description of the above-mentioned embodiment shows a block of a functional unit. These functional blocks (structural units) are implemented by any combination of at least one of hardware and software. In addition, the implementation method of each functional block is not particularly limited. That is, each functional block can be implemented by a device that is physically or logically combined, or two or more devices that are physically or logically separated can be directly or indirectly (for example, by wired, wireless, etc.) connected and implemented by these multiple devices. The functional block can also be implemented by combining the above-mentioned one device or the above-mentioned multiple devices with software.

[0211] Here, the functions include judging, deciding, determining, calculating, calculating, processing, deriving, investigating, searching, confirming, receiving, sending, outputting, accessing, solving, selecting, selecting, establishing, comparing, assuming, expecting, regarding, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc., but are not limited to these. For example, a functional block (structural unit) that implements a sending function may also be referred to as a transmitting unit, a transmitter, etc. Any one of them is as described above, and the implementation method is not particularly limited.

[0212] For example, a base station, a user terminal, etc. in one embodiment of the present disclosure may also function as a computer that performs processing of the wireless communication method of the present disclosure. Figure 7 1001, memory 1002, storage 1003, communication device 1004, input device 1005, output device 1006, bus 1007, etc.

[0213] In addition, in the present disclosure, the terms such as device, circuit, equipment, section, unit, etc. are interchangeable. The hardware structure of the base station 10 and the user terminal 20 may be configured to include one or more of the devices shown in the figure, or may be configured to exclude some of the devices.

[0214] For example, only one processor 1001 is shown, but there may be multiple processors. In addition, the processing may be performed by one processor, or may be performed by two or more processors simultaneously, sequentially, or in other ways. In addition, the processor 1001 may also be implemented by one or more chips.

[0215] The functions of the base station 10 and the user terminal 20 are realized, for example, by reading specific software (program) into hardware such as the processor 1001 and the memory 1002, so that the processor 1001 performs calculations and controls communication via the communication device 1004, or controls at least one of the reading and writing of data in the memory 1002 and the storage 1003.

[0216] The processor 1001 controls the entire computer by, for example, operating an operating system. The processor 1001 may also be composed of a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, a register, etc. For example, at least a part of the above-mentioned control unit 110 (210), the sending and receiving unit 120 (220), etc. may also be implemented by the processor 1001.

[0217] In addition, the processor 1001 reads the program (program code), software module, data, etc. from at least one of the storage 1003 and the communication device 1004 to the memory 1002, and performs various processes based on them. As a program, a program that enables a computer to perform at least a part of the operations described in the above-mentioned embodiments can be used. For example, the control unit 110 (210) can also be implemented by a control program stored in the memory 1002 and operated in the processor 1001, and the same can be implemented for other functional blocks.

[0218] The memory 1002 may also be a computer-readable recording medium, for example, composed of at least one of a read-only memory (ROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), a random access memory (RAM), or other appropriate storage media. The memory 1002 may also be referred to as a register, a cache, a main memory (main storage device), etc. The memory 1002 can store executable programs (program codes), software modules, etc. for implementing the wireless communication method involved in one embodiment of the present disclosure.

[0219] The storage 1003 may also be a computer-readable recording medium, such as a flexible disk, a floppy disk, an optical disk (such as a compact disk (Compact Disc ROM (CD-ROM)), etc.), a digital versatile disk, a Blu-ray (registered trademark) disk, a removable disk, a hard disk drive, a smart card, a flash memory device (such as a card, a stick, a key drive), a magnetic stripe, a database, a server, or at least one of other appropriate storage media. The storage 1003 may also be referred to as an auxiliary storage device.

[0220] The communication device 1004 is hardware (transmitting and receiving device) for communicating between computers via at least one of a wired network and a wireless network, and is also called a network device, a network controller, a network card, a communication module, etc. In order to realize at least one of frequency division duplex (Frequency Division Duplex (FDD)) and time division duplex (Time Division Duplex (TDD)), the communication device 1004 can also be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. For example, the above-mentioned transmitting and receiving unit 120 (220), the transmitting and receiving antenna 130 (230), etc. can also be realized by the communication device 1004. The transmitting and receiving unit 120 (220) can also be installed by the transmitting unit 120a (220a) and the receiving unit 120b (220b) separately physically or logically.

[0221] The input device 1005 is an input device that receives input from the outside (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.). The output device 1006 is an output device that implements output to the outside (e.g., a display, a speaker, a light emitting diode (LED) lamp, etc.). In addition, the input device 1005 and the output device 1006 may also be an integrated structure (e.g., a touch panel).

[0222] In addition, the processor 1001, the memory 1002 and other devices are connected via a bus 1007 for communicating information. The bus 1007 may be configured as a single bus or different buses may be used between the devices.

[0223] 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 the hardware may be used to implement a part or all of each functional block. For example, the processor 1001 may also be installed using at least one of these hardware.

[0224] (Variation Example)

[0225] In addition, the terms described in the present disclosure and the terms required for understanding the present disclosure may also be replaced with terms having the same or similar meanings. For example, channels, code elements, and signals (signals or signaling) may also be replaced with each other. In addition, a signal may also be a message. A reference signal may also be referred to as RS, and may also be referred to as a pilot, a pilot signal, etc. depending on the standard applied. In addition, a component carrier (CC) may also be referred to as a cell, a frequency carrier, a carrier frequency, etc.

[0226] A wireless frame may also be composed of one or more periods (frames) in the time domain. Each period (frame) of the one or more periods (frames) constituting a wireless frame may also be referred to as a subframe. Further, a subframe may also be composed of one or more time slots in the time domain. A subframe may also be a fixed time length (e.g., 1 ms) that is not dependent on a parameter set (numerology).

[0227] Here, the parameter set may also refer to a communication parameter applied in at least one of the transmission and reception of a certain signal or channel. For example, the parameter set may also represent at least one of the subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), the number of symbols per TTI, wireless frame structure, specific filtering processing performed by the transmitter and receiver in the frequency domain, specific windowing processing performed by the transmitter and receiver in the time domain, etc.

[0228] A time slot may also be composed of one or more symbols (Orthogonal Frequency Division Multiplexing (OFDM) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, etc.) in the time domain. In addition, a time slot may also be a time unit based on a parameter set.

[0229] A time slot may also include multiple mini-slots. Each mini-slot may also be composed of one or more symbols in the time domain. In addition, a mini-slot may also be referred to as a sub-slot. A mini-slot may also be composed of fewer symbols than a time slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a mini-slot may also be referred to as a PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot may also be referred to as a PDSCH (PUSCH) mapping type B.

[0230] Radio frames, subframes, time slots, mini-time slots, and symbols all represent time units for transmitting signals. Radio frames, subframes, time slots, mini-time slots, and symbols may also be referred to by their respective names. In addition, time units such as frames, subframes, time slots, mini-time slots, and symbols in the present disclosure may also be interchangeable.

[0231] For example, a subframe may also be referred to as a TTI, a plurality of consecutive subframes may also be referred to as a TTI, and a time slot or a mini time 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, a period shorter than 1 ms (for example, 1-13 symbols), or a period longer than 1 ms. In addition, the unit representing a TTI may also be referred to as a time slot, a mini time slot, etc. instead of a subframe.

[0232] Here, TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in the LTE system, the base station schedules each user terminal to allocate wireless resources (frequency bandwidth, transmission power, etc. that can be used in each user terminal) in TTI units. In addition, the definition of TTI is not limited to this.

[0233] TTI may also be a transmission time unit for a data packet (transport block), a code block, a code word, etc. that has been channel-coded, and may also be a processing unit for scheduling, link adaptation, etc. In addition, when TTI is given, the time interval (e.g., the number of symbols) to which a transport block, a code block, a code word, etc. is actually mapped may also be shorter than the TTI.

[0234] In addition, when one time slot or one mini time slot is referred to as TTI, one or more TTIs (i.e., one or more time slots or one or more mini time slots) may also be the minimum time unit of scheduling. In addition, the number of time slots (mini time slots) constituting the minimum time unit of scheduling may also be controlled.

[0235] A TTI having a time length of 1 ms may also be referred to as a normal TTI (TTI in 3GPP Rel.8-12), a standard TTI, a long TTI, a normal subframe, a standard subframe, a long subframe, a time slot, etc. A TTI shorter than a normal TTI may also be referred to as a shortened TTI, a short TTI, a partial TTI (partial or fractional TTI), a shortened subframe, a short subframe, a mini time slot, a sub time slot, a time slot, etc.

[0236] In addition, a long TTI (e.g., normal TTI, subframe, etc.) may be replaced by a TTI having a time length exceeding 1 ms, and a short TTI (e.g., shortened TTI, etc.) may be replaced by a TTI having a TTI length shorter than that of the long TTI and longer than 1 ms.

[0237] 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 also be the same regardless of the parameter set, for example, 12. The number of subcarriers included in an RB may also be determined based on the parameter set.

[0238] In addition, an RB may also include one or more symbols in the time domain, and may also be the length of a slot, a mini-slot, a subframe, or a TTI. A TTI, a subframe, etc. may also be composed of one or more resource blocks, respectively.

[0239] In addition, one or more RBs may also be referred to as a physical resource block (Physical RB (PRB)), a sub-carrier group (Sub-Carrier Group (SCG)), a resource element group (Resource Element Group (REG)), a PRB pair, an RB pair, etc.

[0240] In addition, a resource block may also be composed of one or more resource elements (RE). For example, one RE may also be a radio resource region of one subcarrier and one symbol.

[0241] A Bandwidth Part (BWP) (also referred to as a partial bandwidth, etc.) may also represent a subset of contiguous common RBs (common resource blocks) for a parameter set in a carrier. Here, a common RB may also be identified by an index of the RB relative to a common reference point of the carrier. PRBs may also be defined in a BWP and numbered within the BWP.

[0242] The BWP may include a UL BWP (BWP for UL) and a DL BWP (BWP for DL). For a UE, one or more BWPs may be configured in one carrier.

[0243] At least one of the configured BWPs may be activated, and the UE may not assume that it transmits or receives a specific signal / channel other than the activated BWP. In addition, "cell", "carrier", etc. in the present disclosure may also be replaced by "BWP".

[0244] In addition, the above-mentioned structures such as radio frames, subframes, time slots, mini-time slots and symbols are only examples. For example, the number of subframes included in a radio frame, the number of time slots in each subframe or radio frame, the number of mini-time slots included in a time slot, the number of symbols and RBs included in a time slot or mini-time slot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, and the cyclic prefix (CP) length can be changed in various ways.

[0245] In addition, the information, parameters, etc. described in the present disclosure may be represented by absolute values, relative values ​​relative to a specific value, or other corresponding information. For example, wireless resources may also be indicated by a specific index.

[0246] In the present disclosure, the names used for parameters, etc. are not limiting in all respects. In addition, the mathematical formulas, etc. using these parameters may also be different from those explicitly disclosed in the present disclosure. The various channels (PUCCH, PDCCH, etc.) and information elements can be identified by any suitable names, and therefore, the various names assigned to these various channels and information elements are not limiting in all respects.

[0247] Information, signals, etc. described in the present disclosure may also be represented using any of a variety of different techniques. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be mentioned throughout the above description may also be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any combination thereof.

[0248] Furthermore, information, signals, etc. can be output in at least one of the following directions: from a higher layer (upper layer) to a lower layer (lower layer), and from a lower layer to a higher layer. Information, signals, etc. can also be input and output via multiple network nodes.

[0249] The input and output information, signals, etc. may be stored in a specific location (e.g., a memory), or may be managed using a management table. The input and output information, signals, etc. may be overwritten, updated, or appended. The output information, signals, etc. may also be deleted. The input information, signals, etc. may also be sent to other devices.

[0250] The notification of information is not limited to the methods / implementations described in the present disclosure, and may also be performed by other methods. For example, the notification of information in the present disclosure may also be implemented through physical layer signaling (e.g., downlink control information (Downlink Control Information (DCI)), uplink control information (Uplink Control Information (UCI))), high-layer signaling (e.g., Radio Resource Control (RRC)) signaling, broadcast information (Master Information Block (MIB)), System Information Block (SIB), etc.), Medium Access Control (MAC) signaling), other signals or a combination thereof.

[0251] In addition, physical layer signaling may also be referred to as layer 1 / layer 2 (Layer 1 / Layer 2 (L1 / L2)) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. In addition, RRC signaling may also be referred to as an RRC message, such as an RRC connection establishment (RRC Connection Setup) message, an RRC connection reconstruction (RRC Connection Reconfiguration) message, etc. In addition, MAC signaling may also be notified using, for example, a MAC control element (MACControl Element (CE)).

[0252] Furthermore, notification of specific information (eg, notification of “it is X”) is not limited to explicit notification, but may be performed implicitly (eg, by not notifying the specific information or by notifying other information).

[0253] The determination can be made by a value represented by a bit (0 or 1), by a true or false value (Boolean value) represented by true or false, or by comparison of numerical values ​​(for example, comparison with a specific value).

[0254] Whether software is called software, firmware, middle-ware, microcode, hardware description language, or other names, it should be broadly interpreted as meaning instructions, instruction sets, code, code segments, program code, program, sub-program, software modules, applications, software applications, software packages, routines, sub-routines, objects, executable files, execution threads, procedures, functions, etc.

[0255] In addition, software, instructions, information, etc. may also be sent and received via a transmission medium. For example, when software is sent from a website, server, or other remote source using at least one of wired technology (coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and wireless technology (infrared, microwave, etc.), at least one of these wired technology and wireless technology is included in the definition of transmission medium.

[0256] The terms "system" and "network" used in the present disclosure can be used interchangeably. "Network" may also refer to a device (eg, a base station) included in the network.

[0257] In the present disclosure, terms such as "precoding", "precoder", "weight (precoding weight)", "Quasi-Co-Location (QCL)", "Transmission Configuration Indication state (TCI state)", "spatial relation", "spatial domain filter", "transmission power", "phase rotation", "antenna port", "antenna port group", "layer", "number of layers", "rank", "resource", "resource set", "resource group", "beam", "beam width", "beam angle", "antenna", "antenna element", and "panel" can be used interchangeably.

[0258] In the present disclosure, terms such as "base station (BS)", "wireless base station", "fixed station", "NodeB", "eNB (eNodeB)", "gNB (gNodeB)", "access point", "transmission point (TP)", "reception point (RP)", "transmission / reception point (TRP)", "panel", "cell", "sector", "cell group", "carrier", and "component carrier" can be used interchangeably. There are also cases where base stations are referred to by terms such as macro cell, small cell, micro cell, and pico cell.

[0259] A base station can accommodate one or more (for example, three) cells. When a base station accommodates multiple cells, the overall coverage area of ​​the base station can be divided into multiple smaller areas, and each smaller area can also provide communication services through a base station subsystem (for example, a small base station for indoor use (Remote Radio Head (RRH))). Terms such as "cell" or "sector" refer to a part or the entirety of the coverage area of ​​at least one of a base station and a base station subsystem that provides communication services within the coverage area.

[0260] In the present disclosure, terms such as “mobile station (MS)”, “user terminal”, “user device (User Equipment (UE))”, and “terminal” are used interchangeably.

[0261] In some cases, the mobile station is also referred to as a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communication device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a hand set, a user agent, a mobile client, a client, or some other appropriate terminology.

[0262] 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 carried in a mobile body, a mobile body, etc. The mobile body may be a means of transportation (e.g., a vehicle, an airplane, etc.), a mobile body that moves in an unmanned manner (e.g., a drone, an autonomous driving vehicle, etc.), or a robot (manned or unmanned). In addition, at least one of the base station and the mobile station also includes a device that does not necessarily move when performing a communication operation. For example, at least one of the base station and the mobile station may also be an Internet of Things (IoT) device such as a sensor.

[0263] In addition, the base station in the present disclosure may also be replaced by a user terminal. For example, the various methods / implementations of the present disclosure may also be applied to a structure in which the communication between a base station and a user terminal is replaced by the communication between multiple user terminals (for example, it may also be referred to as device-to-device (D2D)), vehicle-to-everything (V2X), etc.). In this case, it may also be set as a structure in which the user terminal 20 has the functions possessed by the above-mentioned base station 10. In addition, expressions such as "uplink" and "downlink" may also be replaced by expressions corresponding to communication between terminals (for example, "side"). For example, an uplink channel, a downlink channel, etc. may also be replaced by a side channel.

[0264] Likewise, the user terminal in the present disclosure may be replaced by a base station. In this case, the base station 10 may have the functions of the user terminal 20 described above.

[0265] In the present disclosure, the actions are assumed to be performed by the base station, and sometimes, depending on the circumstances, they are performed by its upper node. Obviously, in a network including one or more network nodes having a base station, various operations performed for communication with a terminal may be performed by the base station, one or more network nodes other than the base station (for example, Mobility Management Entity (MME)), Serving-Gateway (S-GW), etc., but not limited to these), or a combination thereof.

[0266] The various methods / implementations described in this disclosure may be used individually or in combination, and may be used in a switched manner as the method is executed. In addition, the processing procedures, sequences, flow charts, etc. of the various methods / implementations described in this disclosure may be reversed in order as long as they are not contradictory. For example, for the methods described in this disclosure, the elements of various steps are presented in an illustrative order, but are not limited to the specific order presented.

[0267] The various modes and implementation modes described in the present disclosure may also be applied to Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), systems using other appropriate wireless communication methods, and next-generation systems based on these. In addition, multiple systems can also be combined (for example, LTE or LTE-A, combination with 5G, etc.) for application.

[0268] The term “based on” used in the present disclosure does not mean “based only on” unless otherwise specified. In other words, the term “based on” means both “based only on” and “based at least on”.

[0269] Any reference to an element using the terms "first", "second", etc. used in this disclosure does not fully define the amount or order of these elements. These terms can be used in this disclosure as a convenient method to distinguish between two or more elements. Therefore, reference to a first and a second element does not mean that only two elements can be used, or that the first element must take precedence over the second element in some form.

[0270] The term "determining" as used in this disclosure may include a variety of actions in some cases. For example, "determining" may also be viewed as "judging", calculating, computing, processing, deriving, investigating, looking up (e.g., searching in a table, database, or other data structure), ascertaining, etc.

[0271] In addition, "judgment (decision)" can also be regarded as a situation of "judgment (decision)" on receiving (for example, receiving information), transmitting (for example, sending information), input (input), output (output), accessing (for example, accessing data in a memory), etc.

[0272] In addition, "judgment (decision)" can also be regarded as a situation of "judgment (decision)" on resolving, selecting, choosing, establishing, comparing, etc. In other words, "judgment (decision)" can also be regarded as a situation of "judgment (decision)" on some actions.

[0273] In addition, "judge (decide)" can also be replaced by "assuming (assuming)", "expecting (expecting)", "considering (considering)" and so on.

[0274] The terms "connected", "coupled", or all their variations used in this disclosure mean all direct or indirect connections or combinations between two or more elements, and may include the situation where one or more intermediate elements exist between two elements that are "connected" or "coupled" to each other. The combination or connection between elements may be physical, logical, or a combination of these. For example, "connection" may also be replaced by "access".

[0275] In the present disclosure, when two elements are connected, it can be considered that they are "connected" or "combined" to each other using one or more wires, cables, printed electrical connections, etc., as well as using electromagnetic energy with wavelengths in the wireless frequency domain, microwave region, light (both visible and invisible) region, etc. as several non-limiting and non-inclusive examples.

[0276] In the present disclosure, the term "A is different from B" may also mean "A and B are different from each other". In addition, the term may also mean "A and B are different from C, respectively". The terms "separate" and "combined" may also be interpreted as "different".

[0277] In the present disclosure, when the terms "include", "including", and their variations are used, these terms, like the term "comprising", have an inclusive meaning. Furthermore, the term "or" used in the present disclosure does not mean an exclusive OR.

[0278] In the present disclosure, when an article is added by translation like a, an, and the in English, for example, the present disclosure may also include a case where the noun following the article is in plural form.

[0279] The invention involved in the present disclosure has been described in detail above, but it is obvious to those skilled in the art that the invention involved in the present disclosure is not limited to the embodiments described in the present disclosure. The invention involved in the present disclosure can be implemented as a modified and altered mode without departing from the gist and scope of the present invention determined based on the description of the claims. Therefore, the description of the present disclosure is for the purpose of illustrative description and does not have any limiting meaning on the invention involved in the present disclosure.

Claims

1. A terminal, characterized in that: have: A receiving unit receives a high-layer signaling including a first parameter but not including a second parameter, wherein the first parameter specifies a 0th identifier, i.e., a 0th ID, used in initialization of data scrambling for a physical downlink shared channel PDSCH from a transmission / reception point TRP; as well as A control unit, upon receiving the high-layer signaling including the first parameter but not including the second parameter, determines, based on the first parameter, the value of the 0th ID used in initializing data scrambling for the one PDSCH from the one TRP, When receiving high-layer signaling including both the first parameter and the second parameter, the control unit determines, based on the first parameter, the value of the first ID used in the initialization of data scrambling for PDSCHs corresponding to the first control resource set in multiple PDSCHs from multiple TRPs that partially or completely overlap in at least one of the time and frequency directions; determines, based on the second parameter, the value of the second ID used in the initialization of data scrambling for PDSCHs corresponding to the second control resource set in the multiple PDSCHs; and initializes data scrambling for the multiple PDSCHs from the multiple TRPs using the first ID based on the first parameter specifying the 0th ID used in the initialization of data scrambling for the one PDSCH from the one TRP and the value of the second ID based on the second parameter.

2. A wireless communication method of a terminal, comprising: Receiving a high-layer signaling including a first parameter but not a second parameter, the first parameter specifying a step of a 0th identifier, 0th ID, used in initialization of data scrambling for a physical downlink shared channel PDSCH from a transmission reception point TRP; Upon receiving the higher layer signaling including the first parameter but not including the second parameter, a step of determining, based on the first parameter, a value of the 0th ID used in initializing data scrambling for the one PDSCH from the one TRP; Upon receiving high-layer signaling including both the first parameter and the second parameter, a step of determining, based on the first parameter, a value of a first ID used in initialization of data scrambling for a PDSCH corresponding to a first control resource set in a plurality of PDSCHs from a plurality of TRPs that partially or completely overlap in at least one of a time and a frequency direction; and a step of determining, based on the second parameter, a value of a second ID used in initialization of data scrambling for a PDSCH corresponding to a second control resource set in the plurality of PDSCHs; and The step of initializing data scrambling for the multiple PDSCHs from the multiple TRPs using the first ID of the first parameter based on the 0th ID used in initializing data scrambling for the one PDSCH from the one TRP, and the value of the second ID based on the second parameter.

3. A base station, characterized in that: have: A sending unit sends a high-layer signaling including a first parameter but not a second parameter to a terminal, wherein the first parameter specifies a 0th identifier, i.e., a 0th ID, used in initialization of data scrambling for a physical downlink shared channel PDSCH from a transmission / reception point TRP; as well as a control unit that controls initialization of data scrambling for the one PDSCH from the one TRP based on the 0th ID specified for the terminal by the first parameter, when the high-layer signaling including the first parameter but not including the second parameter is sent, The control unit, when sending high-layer signaling including both the first parameter and the second parameter, controls the initialization of data scrambling for PDSCHs corresponding to the first control resource set in multiple PDSCHs from multiple TRPs that partially or completely overlap in at least one of the time and frequency directions based on the first ID specified for the terminal through the first parameter; controls the initialization of data scrambling for PDSCHs corresponding to the second control resource set in the multiple PDSCHs based on the second ID specified for the terminal through the second parameter; and controls the initialization of data scrambling for the multiple PDSCHs from the multiple TRPs using the first ID of the first parameter specified based on the 0th ID used in the initialization of data scrambling for the one PDSCH from the one TRP and the value of the second ID based on the second parameter.

4. A system having a terminal and a base station, The terminal has: A receiving unit receives a high-layer signaling including a first parameter but not including a second parameter, wherein the first parameter specifies a 0th identifier (0th ID) used in initialization of data scrambling for a physical downlink shared channel PDSCH from a transmission / reception point TRP; and A control unit, upon receiving the high-layer signaling including the first parameter but not including the second parameter, determines, based on the first parameter, the value of the 0th ID used in initializing data scrambling for the one PDSCH from the one TRP, When receiving high-layer signaling including both the first parameter and the second parameter, the control unit determines, based on the first parameter, a value of a first ID used in initializing data scrambling for a PDSCH corresponding to a first control resource set in a plurality of PDSCHs from a plurality of TRPs that partially or completely overlap in at least one of a time and a frequency direction; determines, based on the second parameter, a value of a second ID used in initializing data scrambling for a PDSCH corresponding to a second control resource set in the plurality of PDSCHs; and initializes data scrambling for the plurality of PDSCHs from the plurality of TRPs using the first ID based on the first parameter specifying the 0th ID used in initializing data scrambling for the one PDSCH from the one TRP and the value of the second ID based on the second parameter. The base station has: a sending unit, configured to send to the terminal: the high-layer signaling including the first parameter but not including the second parameter, or the high-layer signaling including both the first parameter and the second parameter; and A control unit controls the initialization of data scrambling for the one PDSCH from the one TRP, and the initialization of data scrambling for multiple PDSCHs from the multiple TRPs that partially or completely overlap in at least one of the time and frequency directions.

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