CN115104357A - Terminal, wireless communication method, and base station - Google Patents

Abstract

A terminal according to an aspect of the present disclosure includes: a reception unit that receives setting information for using different Channel State Information (CSI) -Reference Signal (RS) sequences among a plurality of resources, each of which is any one of a CSI-RS port, a Code Division Multiplexing (CDM) group, and a cell; and a control unit that performs measurement using a plurality of CSI-RS sequences based on the setting information. According to an aspect of the present disclosure, measurement accuracy of a CSI-RS is improved.

Description

Terminal, wireless communication method, and base station

Technical Field

The present disclosure relates to a terminal, a wireless communication method, and a base station in a next generation mobile communication system.

Background

In a Universal Mobile Telecommunications System (UMTS) network, Long Term Evolution (LTE) is standardized for the purpose of further high data rate, low latency, and the like (non-patent document 1). In addition, LTE-Advanced (3GPP rel.10-14) is standardized for the purpose of further increasing the capacity and the height of LTE (Third Generation Partnership Project (3GPP)) versions (Release (Rel.))8 and 9).

Successor systems of LTE, such as also referred to as a fifth generation mobile communication system (5G), 5G + (plus), a sixth generation mobile communication system (6G), New Radio (NR), 3GPP rel.15 and so on, are also being studied.

In an existing LTE system (e.g., 3GPP rel.8-14), a User terminal (User Equipment (UE))) transmits Uplink Control Information (UCI)) using at least one of a UL data Channel (e.g., a Physical Uplink Shared Channel (PUSCH)) and a UL Control Channel (e.g., a Physical Uplink Control Channel (PUCCH)).

Documents of the prior art

Non-patent document

Non-patent document 13 GPP TS 36.300 V8.12.0 "Evolved Universal Radio Access (E-UTRA) and Evolved Universal Radio Access Network (E-UTRAN); (ii) an Overall description; stage 2(Release 8) ", 4 months 2010

Disclosure of Invention

Problems to be solved by the invention

In a wireless communication system (e.g., rel.15nr), a plurality of Channel State Information (CSI)) -Reference Signals (RS) are multiplexed with each other using at least 1 of Time Division Multiplexing (TDM), Frequency Division Multiplexing (FDM), and Code Division Multiplexing (CDM) and transmitted using a plurality of CSI-RS ports, respectively.

However, the accuracy of measurement (estimation, tracking) may be degraded in consideration of interference due to multiple CSI-RSs transmitted in the same Resource Element (RE). If the measurement accuracy of the CSI-RS decreases, the system performance may decrease.

Accordingly, an object of the present disclosure is to provide a terminal, a wireless communication method, and a base station that improve measurement accuracy of CSI-RS.

Means for solving the problems

A terminal according to an aspect of the present disclosure includes: a reception unit that receives setting information for using different Channel State Information (CSI) -Reference Signal (RS) sequences among a plurality of resources, each of which is any one of a CSI-RS port, a Code Division Multiplexing (CDM) group, and a cell; and a control unit that performs measurement using a plurality of CSI-RS sequences based on the setting information.

Effects of the invention

According to an aspect of the present disclosure, measurement accuracy of a CSI-RS is improved.

Drawings

Fig. 1 is a diagram showing an example of CSI-RS positions in a conventional slot and RB.

FIGS. 2A to 2D are diagrams showing examples of FD-OCC and TD-OCC.

Fig. 3 is a diagram showing an example of CSI-RS positions for each port number.

Fig. 4 shows an example of mapping of CSI-RS of 32 ports.

Fig. 5 shows an example of a CDM group.

Fig. 6 is a diagram showing an example of CSI-RS positions in a slot and an RB.

Fig. 7A and 7B are diagrams showing an example of association between PN sequence samples and CDM groups.

Fig. 8 is a diagram showing an example of a schematic configuration of a radio communication system according to an embodiment.

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

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

Fig. 11 is a diagram showing an example of hardware configurations of a base station and a user terminal according to an embodiment.

Detailed Description

(CSI-RS)

In rel.15, CSI-RSs of multiple ports are multiplexed using at least 1 of Frequency Division Multiplexing (FDM), Time Division Multiplexing (TDM), Code division multiplexing (CDM (Code domain (Orthogonal Code)), time domain OCC)). The CSI-RS supports a maximum of 32 ports.

The multi-port CSI-RS is used for, for example, orthogonalization of multiple-input multi-output (mimo) layers. For example, for single-user MIMO, different DMRS ports are set for each layer. For multi-user MIMO, different DMRS ports are set per layer within 1UE and per UE.

In rel.15, the CSI-RS supports a maximum of 32 ports through at least 1 of time domain OCC and frequency domain OCC (maximum 4 in time direction and maximum 2 in frequency direction), FDM, TDM.

In rel.15, as a DL RS used for at least 1 of acquisition of Channel State Information (CSI), Beam Management (BM), Beam Failure Recovery (BFR), and fine tracking (tracking) of time and frequency, for example, a CSI-RS is used. The CSI-RS supports 1, 2, 4, 8, 12, 16, 24, 32 ports (antenna ports, CSI-RS ports). The CSI-RS supports periodic (periodic), semi-persistent (semi-persistent), and aperiodic (aperiodic) transmission. The frequency density (diversity) of the CSI-RS can be set in order to adjust the overhead and CSI estimation accuracy.

Fig. 1 is a diagram illustrating an example of a CSI-RS location (location) in a slot. Each row of the table indicates a row number, a port number, a density of a frequency domain, a CDM type, time, and a frequency (time/frequency) position (kbar, lbar) of a component resource (CDM group)), a CDM group index, and each resource position ((RE, symbol), (k ', l')) within the component resource). Here, the time/frequency position is a position of a resource (component resource) of time and frequency of the CSI-RS corresponding to 1 port. kbar is a symbol with an upper line attached to "k". kbar denotes a starting Resource Element (RE) index of the component resource, and lbar denotes a starting symbol (OFDM symbol) index of the component resource.

As CDM group, there is no CDM (no CDM, N/A), FD-CDM2, CDM4, CDM 8. The FD-CDM2 multiplexes CSI-RSs for 2 ports in the same time and frequency by multiplying a Frequency Domain (FD) -Orthogonal Cover Code (OCC) of length 2 by RE unit (FD 2). CDM4 multiplexes CSI-RSs of 4 ports (FD2TD2) at the same time and frequency by multiplying FD-OCC of length 2 and Time Domain (TD) -OCC of length 2 by RE unit symbol units. CDM8 multiplexes CSI-RSs of 8 ports (FD2TD4) at the same time and frequency by multiplying FD-OCC of length 2 and TD-OCC of length 4 by RE unit symbol unit.

FIGS. 2A to 2D are diagrams showing examples of FD-OCC and TD-OCC. FD-OCC sequence in w _f (k') the sequence of TD-OCC is represented by w _t (k') is shown. Fig. 2A shows a case where the CDM type is no CDM. Fig. 2B shows a case where the CDM type is FD-CDM 2. Fig. 2C shows a case where the CDM type is CDM 4. Fig. 2D shows a case where the CDM type is CDM 8.

Fig. 3 is a diagram showing an example of CSI-RS positions for each port number in fig. 1. The figure shows frequency density, component resource size (size in frequency direction [ RE ], size in time direction [ symbol ]), and CDM type for each port number.

For example, fig. 4 shows an example of Resource Element (RE) mapping of CSI-RS set to have a port number of 32 and a component resource size of 2 subcarriers × 2 symbols (row index 17 in fig. 1). In the frequency domain of 1 Physical Resource Block (PRB)) x1 slot and in the time domain, component resources of 2 subcarriers × 2 symbols are multiplexed (frequency division multiplexing (FDM)) 4 in the frequency domain and multiplexed (time division multiplexing (TDM)) 2 in the time domain, so that 4 × 2 component resources are mapped. Further, for the CSI-RS in each component resource, the FD-OCC of length 2 subcarrier and the TD-OCC of length 2 symbol are multiplied by each other, and 4 CSI-RSs are multiplexed (code division multiplexing (CDM)) (CDM4, FD2TD 2). Thus, in a resource of 1PRB × 1 slot, a CSI-RS of 32 ports is transmitted.

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

In NR, NZP-CSI-RS is used in time/frequency tracking, CSI calculation, L1-RSRP/SINR calculation, mobility.

The sequence generation for NZP-CSI-RS is based on a Pseudo-Random number (Pseudo-Random), Pseudo-noise (pn)) sequence defined by the following formula.

[ number 1]

Formula (1)

c (n) is defined according to the following.

[ number 2]

Formula (2)

c(n)＝(x ₁ (n+N _C )+x ₂ (n+N _C ))mod 2

x ₁ (n+31)＝(x ₁ (n+3)+x ₁ (n))mod 2

x ₂ (n+31)＝(x ₂ (n+3)+x ₂ (n+2)+x ₂ (n+1)+x ₂ (n))mod 2

N _C 1600. 1 st sequence x ₁ (n) is initialized with x1(0) 1, x1(n) 0, n 1, 2.2 nd m sequence x ₂ (n) by c _init Is initialized. c. C _init Depending on the purpose of use of the sequence. Pseudo-random number sequence generator for CSI-RS sequence r (m) by c _init To be initialized in the beginning of each OFDM symbol.

[ number 3]

Formula (3)

n _s，f ^μ Is the slot number within the radio frame. And L is the OFDM code element number in the time slot. n is _ID This corresponds to a scramble ID parameter (higher layer parameter scramblingID) or a sequence generation setting parameter (higher layer parameter sequence generation configuration). n is _symb ^slot Is the number of symbols per slot.

For each set CSI-RS, if a condition is satisfied, the UE assumes that the sequence r (m) is mapped to a Resource Element (RE) (k, l) according to the following equation _p，μ 。

[ number 4]

Formula (4)

n＝0，1，...

Provided that the resource element (k, l) _p，μ Exists in a resource block occupied by the CSI-RS resource set by the UE. The reference point for k-0 is subcarrier 0 within common resource block 0. ρ is assigned by a higher layer parameter diversity in a CSI-RS-ResourceMeping Information Element (IE) or a CSI-RS-CellMobilty IEThen, the method is carried out. The port number X is given by the high level parameter nrofPorts. K is an index (position) of a frequency domain (subcarrier) with respect to the reference point. l is the index (position) of the time domain (symbol) for the reference point. p is the antenna port index. μ is the subcarrier spacing setting.

For NZP-CSI-RS, the UE is assumed to satisfy β _CSIRS >0。β _CSIRS If provided, a power offset determined by the higher layer parameter powercontroloffset ss within the NZP-CSI-RS-Resource IE. w is a _f (k') is the FD-OCC associated with CDM group. w is a _t (l') is TD-OCC associated with CDM group. r is _l,ns,fμ (m') is in time slot n _s,f ^μ The initialized PN sequence in symbol l. k' is a subcarrier index of an RE within a CDM group. l' is a symbol index of REs within a CDM group. N is a radical of hydrogen _sc ^RB As the number of subcarriers per RB.

In addition, the RE position of the CSI-RS is common among cells. Even if different scrambling IDs are set for each cell, inter-sequence interference (inter-cell interference) of CSI-RS may increase. In general, assuming inter-cell CSI-RS interference is low, the CSI-RS is mapped on the same RE in multiple cells. Even if different scrambling IDs are set between a plurality of cells, finite PN sequences are not orthogonal (not orthogonal sequences, pseudo orthogonal sequences, or imperfect orthogonal sequences), and thus inter-cell interference occurs.

Further, the generated PN sequence is common to all ports.

12 CSI-RS ports are envisaged. The number of rows in FIG. 1 is 12, k ₀ ＝0、k ₁ ＝4、k ₂ ＝8、l ₀ In the case of 3, CDM groups 0, 1, and 2 as in fig. 5 are used. In this case, the following 2 PN sequences r are used for all 12 ports _l,ns,fμ (m′)。

PN sequence r for the 3 rd OFDM symbol _3,ns,fμ (m') is [ r ₃ (0),r ₃ (1),...]。

PN sequence r for the 4th OFDM symbol _4,ns,fμ (m') is [ r ₄ (0),r ₄ (1),...]。

For within each CDM groupSelects different samples from the PN sequences. For example, select [ r ] for CDM group 0 ₃ (0),r ₃ (4),r ₄ (1),r ₄ (9)]For CDM group 1, [ r ] is selected ₃ (1),r ₃ (5),r ₄ (0),r ₄ (10)]。

All ports use the same PN sequence, so there is a possibility that neighboring cells use the same PN sequence. In this case, the accuracy of channel estimation based on CSI-RS becomes low.

It is considered that interference of a plurality of CSI-RS sequences transmitted in the same RE like this causes a decrease in measurement accuracy. If the measurement accuracy of the CSI-RS decreases, the system performance may decrease.

Accordingly, the present inventors have conceived a method of reducing interference between a plurality of CSI-RSs transmitted in the same time/frequency resource.

Hereinafter, embodiments according to the present disclosure will be described in detail with reference to the drawings. The radio communication methods according to the respective embodiments may be applied individually or in combination of at least 2.

In the present disclosure, "a/B", "at least one of a and B" may also be substituted for each other. In the present disclosure, a cell, a Component Carrier (CC), a carrier, a bandwidth part (BWP), and a band (band) may be substituted for each other. In the present disclosure, the index, ID, indicator, resource ID may be replaced with each other. In the present disclosure, RRC parameters, higher layer parameters, RRC Information Elements (IEs), RRC messages may also be replaced with each other.

In the present disclosure, the ports, CSI-RS ports, antenna ports may also be replaced with each other. In the present disclosure, the CSI-RS resources, CSI-RS settings, time and frequency resources for CSI-RS may also be substituted for each other.

(Wireless communication method)

In the present disclosure, scrambling ID, sequence generation setting, sequence generationconfiguration, cell ID, pseudo cell ID, virtual cell ID, ndid may be replaced with each other.

In the present disclosure, resources, CDM groups, CSI-RS ports, cells, parameters, indexes may also be substituted for one another.

In the present disclosure, a CDM group may also be a plurality of CSI-RS resources orthogonalized by at least 1 of a time domain OCC and a frequency domain OCC in the same RE.

In the present disclosure, measurement, estimation, calculation, CSI calculation, tracking, L1-RSRP/SINR calculation, and mobility, channel estimation may be substituted for each other.

The UE may also measure CSI-RS to which at least 1 of the following embodiments are applied.

< embodiment mode 1 >

For multiple resources, resource-specific PN sequences may also be generated. Different PN sequences may also be generated between multiple resources.

Different scrambling IDs may also be assigned for multiple resources. The resource-specific c can also be determined by the scrambling ID _init And generating a resource-specific PN sequence.

EXAMPLES 1 to 1

For the CDM group, a CDM group-specific PN sequence may also be generated. Different PN sequences may also be generated between multiple CDM groups.

Different scrambling IDs may also be allocated for multiple CDM groups. CDM group-specific c can also be determined by the scrambling ID _init A CDM group-specific PN sequence is generated.

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

[ scrambling ID determination method 1]

Scrambling ID information (scramblingID) for each CDM group may also be set by RRC parameters.

[ scrambling ID determination method 2]

The UE may also identify a scrambling ID specific to each CDM group based on scrambling ID information (scramblingID) assigned to the CSI-RS resource and a specific parameter x. For example, as shown in fig. 6, the scramble ID offset y may be added to the table of fig. 1 _i . The specific parameter x may also be the port number. Scrambling ID offset y _i Association may also be made for CDM group i. The UE may also be configured to determine the UE's location by basing it on certain parametersx to determine a scrambling ID offset y for each CDM group _i And scrambling ID information to be set with y _i And added to determine a scrambling ID specific to the CDM group.

Thus, the probability of using a CSI-RS sequence highly correlated with a CSI-RS sequence of a neighboring cell can be reduced between a plurality of CDM groups. In addition, in at least a part of the CSI-RS ports, the probability of using a CSI-RS sequence that is low correlated with a CSI-RS sequence of a neighboring cell is increased.

EXAMPLES 1 to 2

For CSI-RS ports (antenna ports), PN sequences for the CSI-RS ports may also be generated. Different PN sequences may also be generated between multiple CSI-RS ports.

Different scrambling IDs may also be assigned for multiple CSI-RS ports. The CSI-RS port specific c can also be determined by the scrambling ID _init And generating a CSI-RS port specific PN sequence.

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

[ scrambling ID determination method 1]

Scrambling ID information (scramblingID) for each CSI-RS port may also be set through the RRC parameter.

[ scramble ID determination method 2]

The UE may also identify a scrambling ID specific to each CSI-RS port based on scrambling ID information (scramblingID) given to the CSI-RS resource and a specific parameter x. For example, the scramble ID offset y may be added to the table of fig. 1 _i . The specific parameter x may also be the port number. Scrambling ID offset y _i Association may also be made for CSI-RS port i. The UE may also determine a scrambling ID offset y for each CSI-RS port based on a particular parameter x _i And scrambling ID information to be set with y _i Add to determine the scrambling ID specific to the CSI-RS port.

Thus, in a full CSI-RS port (e.g., 32 ports), the probability of using a CSI-RS sequence that is highly correlated with CSI-RS sequences of neighboring cells can be reduced. In addition, in at least a part of the CSI-RS ports, the probability of using a CSI-RS sequence that is low correlated with a CSI-RS sequence of a neighboring cell is increased.

< embodiment 2 >

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

In the existing NR, for example, as shown in fig. 7A, the association of the PN sequence sample index and the CDM group is common in all cells.

As shown in fig. 7B, the association of the PN sequence sample index and the CDM group may also be different between a plurality of cells. The association may be specified in the specification or may be set by RRC parameters. The PN sequence sample indices associated with 1 CDM group may be continuous or discontinuous (or equally spaced).

The association of PN sequence sample indices and CSI-RS ports may also differ between cells. The association may be specified in the specification or may be set by RRC parameters. The PN sequence sample indices associated with 1 CSI-RS port may be continuous or discontinuous (or equally spaced).

The mapping of PN sequence sample indices to REs may also differ between cells. The mapping may be specified in the specification or may be set by RRC parameters.

Multiple cells may also use samples with different indices from the PN sequence.

For the sample index m' of the PN sequence, a cell-specific value f (x) is also possible _cell ) And (4) adding. For example, the sample index m' of the PN sequence can also be set byIs expressed by the formula.

[ number 5]

Formula (5)

f(x _cell ) Or may be a scrambling ID.

f(x _cell ) And may also be CSI-RS port indices.

f(x _cell ) May also be a CDM group index for CSI-RS.

According to embodiment 2 described above, even when the same PN sequence is used among a plurality of cells, interference can be reduced by using samples having different PN sequences.

< embodiment 3 >

Multiple scrambling IDs may also be set by RRC parameters. The number of scramble IDs may be 2 or another number. The plurality of scrambling IDs may also be a list of scrambling IDs.

It is also possible to indicate (or switch) 1 of the set multiple scrambling IDs based on Downlink Control Information (DCI) that triggers a-CSI-RS or a-CSI report.

The indication based on the scrambling ID of the DCI may be a new field appended in a new version (release), a replacement (interpretation) of an existing field, or an implied indication. The implied indication may also be at least 1 of the initial Control Channel Element (CCE) index, the initial PRB index, the initial RE index based on the PDCCH transmitting the DCI.

The UE may also assume that a new field exists if multiple scrambling IDs (a certain number of scrambling IDs) are set for the CSI-RS resource, and otherwise assume that a new field does not exist (new field size is 0 bits).

A plurality of scramble IDs may be set for each of the plurality of resources. The UE may also decide 1 scrambling ID for each resource based on the DCI. The UE may also decide different scrambling IDs among multiple resources according to embodiment 1. A plurality of scrambling IDs may also be set for each CDM group. Multiple scrambling IDs may be set for each CSI-RS port.

According to embodiment 3 above, the scrambling ID can be dynamically changed, and the CSI sequence can be changed according to the state of interference.

< embodiment 4 >

The UE can report at least 1 of the functions described in embodiments 1 to 3 by using the UE capability information.

The UE reporting the support function may also use the function. UEs that do not report support functions may also perform actions of rel.15.

According to embodiment 4 above, the UE can perform appropriate actions according to the capabilities.

(Wireless communication System)

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

Fig. 8 is a diagram showing an example of a schematic configuration of a radio communication system according to an embodiment. The Radio communication system 1 may be a system that realizes communication by using Long Term Evolution (LTE) standardized by the Third Generation Partnership Project (3GPP), a New Radio system (5G NR) of the fifth Generation mobile communication system, or the like.

In addition, the wireless communication system 1 may also support Dual connection (Multi-RAT Dual Connectivity (MR-DC)) between a plurality of Radio Access Technologies (RATs)). The MR-DC may include Dual connection of LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC))), Dual connection of NR and LTE (NR-E-UTRA Dual Connectivity (NE-DC))), and the like.

In EN-DC, a base station (eNB) of LTE (E-UTRA) is a Master Node (MN), and a base station (gNB) of NR is a Secondary Node (SN). In NE-DC, the base station of NR (gNB) is MN and the base station of LTE (E-UTRA) (eNB) is SN.

The wireless communication system 1 may also support Dual connection between a plurality of base stations within the same RAT (for example, Dual connection of a base station (gNB) in which both MN and SN are NR (NR-NR Dual Connectivity (NN-DC))).

The wireless communication system 1 may include: a base station 11 forming a macrocell C1 having a relatively wide coverage area, and base stations 12(12a to 12C) arranged in the macrocell C1 and forming a small cell C2 narrower than the macrocell C1. The user terminal 20 may also be located in at least one cell. The arrangement, number, and the like of each cell and user terminal 20 are not limited to the embodiments shown in the figures. Hereinafter, base stations 11 and 12 will be collectively referred to as base station 10 without distinguishing them.

The user terminal 20 may also 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) and Dual Connectivity (DC) using a plurality of Component Carriers (CCs)).

Each CC may be included in at least one of the first Frequency band (Frequency Range 1(FR1))) and the second Frequency band (Frequency Range 2(FR 2))). Macro cell C1 may also be contained in FR1 and small cell C2 may also be contained in FR 2. For example, FR1 may be a frequency band of 6GHz or less (sub-6GHz), and FR2 may be a frequency band higher than 24GHz (above-24 GHz). The frequency bands, definitions, and the like of FR1 and FR2 are not limited to these, and FR1 may correspond to a higher frequency band than FR2, for example.

The user terminal 20 may perform communication in each CC by using at least one of Time Division Duplex (TDD) and Frequency Division Duplex (FDD).

The plurality of base stations 10 may also be connected by wire (e.g., optical fiber based Common Public Radio Interface (CPRI)), X2 Interface, or the like) or wirelessly (e.g., NR communication). For example, when NR communication is used as a Backhaul between base stations 11 and 12, base station 11 corresponding to an upper station may be referred to as an Integrated Access Backhaul (IAB) donor (donor) and base station 12 corresponding to a relay (relay) may be referred to as an IAB node.

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 include at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN)), a Next Generation Core (NGC), and the like.

The user terminal 20 may be a terminal supporting at least one of communication schemes such as LTE, LTE-a, and 5G.

The radio communication system 1 may use a radio access scheme based on Orthogonal Frequency Division Multiplexing (OFDM). 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), or the like may be used.

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

In the radio communication system 1, as the Downlink Channel, a Downlink Shared Channel (Physical Downlink Shared Channel (PDSCH)) Shared by the user terminals 20, a Broadcast Channel (Physical Broadcast Channel (PBCH))), a Downlink Control Channel (Physical Downlink Control Channel (PDCCH)), or the like may be used.

In addition, in the radio communication system 1, as the Uplink Channel, an Uplink Shared Channel (Physical Uplink Shared Channel (PUSCH))), an Uplink Control Channel (Physical Uplink Control Channel (PUCCH))), a Random Access Channel (Physical Random Access Channel (PRACH)), and the like, which are Shared by the user terminals 20, may be used.

User data, higher layer control Information, a System Information Block (SIB), and the like are transmitted through the PDSCH. User data, higher layer control information, etc. may also be transmitted over the PUSCH. In addition, a Master Information Block (MIB)) may also be transmitted through PBCH.

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

The DCI scheduling PDSCH may be referred to as DL assignment, DL DCI, or the like, and the DCI scheduling PUSCH may be referred to as UL grant, UL DCI, or the like. The PDSCH may be interpreted as DL data, and the PUSCH may be interpreted as UL data.

For PDCCH detection, a COntrol REsource SET (countrol REsource SET (CORESET)) and a search space (search space) may be used. CORESET corresponds to searching for DCI resources. The search space corresponds to a search region and a search method of PDCCH candidates (PDCCH candidates). 1 CORESET may also be associated with 1 or more search spaces. The UE may also monitor the CORESET associated with a certain search space based on the search space settings.

One search space may also correspond to PDCCH candidates that conform to 1 or more aggregation levels (aggregation levels). The 1 or more search spaces may also be referred to as a set of search spaces. In addition, "search space", "search space set", "search space setting", "search space set setting", "CORESET setting", and the like of the present disclosure may be replaced with each other.

Uplink Control Information (UCI)) including at least one of Channel State Information (CSI), ACKnowledgement Information (for example, Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK)), ACK/NACK, and Scheduling ReQuest (SR)) may be transmitted through the PUCCH. A random access preamble for establishing a connection with a cell may also be transmitted through the PRACH.

In addition, in the present disclosure, a downlink, an uplink, and the like may also be expressed without "link". Note that the "Physical (Physical)" may not be included at the beginning of each channel.

In the wireless communication system 1, a Synchronization Signal (SS), a Downlink Reference Signal (DL-RS), and the like may be transmitted. In the wireless communication system 1, the DL-RS may be a Cell-specific Reference Signal (CRS), a Channel State Information Reference Signal (CSI-RS), a DeModulation Reference Signal (DMRS), a Positioning Reference Signal (PRS), a Phase Tracking Reference Signal (PTRS), or the like.

The Synchronization Signal may be at least one of a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS), for example. The signal blocks including the SSs (PSS, SSs) and the PBCH (and the DMRS for PBCH) may be referred to as SS/PBCH blocks, SS blocks (SSB), and the like. In addition, SS, SSB, etc. may also be referred to as reference signals.

In addition, in the wireless communication system 1, as an Uplink Reference Signal (UL-RS), a measurement Reference Signal (Sounding Reference Signal (SRS)), a demodulation Reference Signal (DMRS), or the like may be transmitted. The DMRS may be referred to as a user terminal specific Reference Signal (UE-specific Reference Signal).

(base station)

Fig. 9 is a diagram showing an example of the configuration of a base station according to an embodiment. The base station 10 includes a control unit 110, a transmitting/receiving unit 120, a transmitting/receiving antenna 130, and a transmission line interface (transmission line interface) 140. The control unit 110, the transmission/reception unit 120, the transmission/reception antenna 130, and the transmission line interface 140 may be provided in plural numbers.

In this example, the functional blocks of the characteristic portions in the present embodiment are mainly shown, but it is also conceivable that the base station 10 has other functional blocks necessary for wireless communication. A part of the processing of each unit described below may be omitted.

The control unit 110 performs overall control of the base station 10. The control unit 110 can be configured by a controller, a control circuit, and the like described based on common knowledge in the technical field of the present disclosure.

The control unit 110 may also control generation of signals, scheduling (e.g., resource allocation, mapping), and the like. The control unit 110 may control transmission and reception, measurement, and the like using the transmission and reception unit 120, the transmission and reception antenna 130, and the transmission path interface 140. Control section 110 may generate data, control information, sequence (sequence), and the like to be transmitted as a signal, and forward the generated data, control information, sequence, and the like to transmission/reception section 120. The control unit 110 may perform call processing (setting, release, and the like) of a communication channel, state management of the base station 10, management of radio resources, and the like.

The transceiver 120 may also include a baseband (baseband) unit 121, a Radio Frequency (RF) unit 122, and a measurement unit 123. The baseband unit 121 may also include a transmission processing unit 1211 and a reception processing unit 1212. The transmission/reception section 120 can be configured by a transmitter/receiver, an RF circuit, a baseband circuit, a filter, a phase shifter (phase shifter), a measurement circuit, a transmission/reception circuit, and the like, which are described based on common knowledge in the technical field of the present disclosure.

The transmission/reception unit 120 may be configured as an integrated transmission/reception unit, or may be configured by a transmission unit and a reception unit. The transmission unit may be constituted by the transmission processing unit 1211 and the RF unit 122. The receiving unit may be configured by the reception processing unit 1212, the RF unit 122, and the measurement unit 123.

The transmitting/receiving antenna 130 can be configured by an antenna described based on common knowledge in the technical field of the present disclosure, for example, an array antenna.

The transmitting/receiving unit 120 may transmit the above-described downlink channel, synchronization signal, downlink reference signal, and the like. The transmission/reception unit 120 may receive the uplink channel, the uplink reference signal, and the like.

Transmit/receive section 120 may form at least one of a transmit beam and a receive beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), and the like.

For example, the transmission/reception unit 120 (transmission processing unit 1211) may generate a bit sequence to be transmitted by performing processing of a Packet Data Convergence Protocol (PDCP) layer, processing of a Radio Link Control (RLC) layer (e.g., RLC retransmission Control), processing of a Medium Access Control (MAC) layer (e.g., HARQ retransmission Control), and the like, with respect to Data, Control information, and the like acquired from the Control unit 110.

Transmission/reception section 120 (transmission processing section 1211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, Discrete Fourier Transform (DFT) processing (if necessary), Inverse Fast Fourier Transform (IFFT) processing, precoding, and digital-analog conversion on a bit sequence to be transmitted, and output a baseband signal.

The transmission/reception unit 120(RF unit 122) may perform modulation, filtering, amplification, and the like on a baseband signal in a radio frequency band, and transmit a signal in the radio frequency band via the transmission/reception antenna 130.

On the other hand, the transmission/reception unit 120(RF unit 122) may perform amplification, filtering, demodulation to a baseband signal, and the like on a signal in a radio frequency band received by the transmission/reception antenna 130.

Transmission/reception section 120 (reception processing section 1212) may acquire user data and the like by applying, to the acquired baseband signal, reception processing such as analog-to-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (if necessary), filtering processing, demapping, demodulation, decoding (may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing.

The transmission/reception unit 120 (measurement unit 123) may also perform measurement related to the received signal. For example, measurement section 123 may perform Radio Resource Management (RRM) measurement, Channel State Information (CSI) measurement, and the like based on the received signal. Measurement section 123 may perform measurement of Received Power (e.g., Reference Signal Received Power (RSRP)), Received Quality (e.g., Reference Signal Received Quality (RSRQ)), Signal to Interference plus Noise Ratio (SINR)), Signal to Noise Ratio (SNR)), Signal Strength Indicator (e.g., Received Signal Strength Indicator (RSSI)), propagation path information (e.g., CSI), and the like. The measurement results may also be output to the control unit 110.

The transmission path interface 140 may transmit and receive signals (backhaul signaling) to and from devices included in the core network 30, other base stations 10, and the like, or may acquire and transmit user data (user plane data) and control plane data and the like for the user terminal 20.

The transmitting unit and the receiving unit of the base station 10 in the present disclosure may be configured by at least one of the transmitting/receiving unit 120, the transmitting/receiving antenna 130, and the transmission path interface 140.

Transmission/reception section 120 may transmit setting information for generating different Channel State Information (CSI) -Reference Signal (RS) sequences among a plurality of resources. The plurality of resources may each be any one of a CSI-RS port, a Code Division Multiplexing (CDM) group, a cell. Control section 110 may also generate a plurality of CSI-RS sequences based on the setting information.

(user terminal)

Fig. 10 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. Further, the control unit 210, the transmission/reception unit 220, and the transmission/reception antenna 230 may be provided in one or more numbers.

In this example, the functional blocks of the characteristic parts in the present embodiment are mainly shown, but it is also conceivable that the user terminal 20 also has other functional blocks necessary for wireless communication. A part of the processing of each unit described below may be omitted.

The control unit 210 performs overall control of the user terminal 20. The control unit 210 can be configured by a controller, a control circuit, and the like described based on common knowledge in the technical field of the present disclosure.

The control unit 210 may also control the generation, mapping, etc. of the signals. The control unit 210 may control transmission/reception, measurement, and the like using the transmission/reception unit 220 and the transmission/reception antenna 230. Control section 210 may generate data, control information, a sequence, and the like transmitted as a signal and forward the generated data, control information, sequence, and the like to transmission/reception section 220.

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

The transmission/reception unit 220 may be configured as an integrated transmission/reception unit, or may be configured by a transmission unit and a reception unit. The transmission section may be constituted by the transmission processing section 2211 and the RF section 222. The receiving unit may be composed of a reception processing unit 2212, an RF unit 222, and a measuring unit 223.

The transmission/reception antenna 230 can be configured by an antenna described based on common knowledge in the technical field of the present disclosure, for example, an array antenna.

The transmitting/receiving unit 220 may receive the downlink channel, the synchronization signal, the downlink reference signal, and the like. The transmission/reception unit 220 may transmit the uplink channel, the uplink reference signal, and the like described above.

Transmit/receive section 220 may form at least one of a transmit beam and a receive beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), and the like.

For example, transmission/reception section 220 (transmission processing section 2211) may perform PDCP layer processing, RLC layer processing (e.g., RLC retransmission control), MAC layer processing (e.g., HARQ retransmission control), and the like on data, control information, and the like acquired from control section 210, and generate a bit sequence to be transmitted.

Transmission/reception section 220 (transmission processing section 2211) may perform transmission processing such as channel coding (including error correction coding as well), modulation, mapping, filtering, DFT processing (if necessary), IFFT processing, precoding, and digital-to-analog conversion on a bit sequence to be transmitted, and output a baseband signal.

Whether or not DFT processing is applied may be set based on transform precoding. When transform precoding is active (enabled) for a certain channel (e.g., PUSCH), transmission/reception section 220 (transmission processing section 2211) may perform DFT processing as the transmission processing in order to transmit the channel using a DFT-s-OFDM waveform, or otherwise, transmission/reception section 220 (transmission processing section 2211) may not perform DFT processing as the transmission processing.

The transmission/reception section 220(RF section 222) may perform modulation, filtering, amplification, and the like on the baseband signal in the radio frequency band, and transmit the signal in the radio frequency band via the transmission/reception antenna 230.

On the other hand, the transmission/reception unit 220(RF unit 222) may perform amplification, filtering, demodulation to a baseband signal, and the like on a signal in a radio frequency band received by the transmission/reception antenna 230.

Transmission/reception section 220 (reception processing section 2212) may apply reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering processing, demapping, demodulation, decoding (including error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal, and acquire user data.

The transceiver unit 220 (measurement unit 223) may also perform measurements related to the received signal. For example, the measurement unit 223 may perform RRM measurement, CSI measurement, and the like based on the received signal. Measurement unit 223 may also measure for received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), and the like. The measurement result may also be output to the control unit 210.

In addition, the transmitting unit and the receiving unit of the user terminal 20 in the present disclosure may be configured by at least 1 of the transmitting/receiving unit 220 and the transmitting/receiving antenna 230.

Transmission reception section 220 receives setting information for using different Channel State Information (CSI) -Reference Signal (RS) sequences among a plurality of resources, which may each be any one of a CSI-RS port, a Code Division Multiplexing (CDM) group, and a cell. Control section 210 may also perform measurement using a plurality of CSI-RS sequences based on the setting information.

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

The setting information may also contain specific parameters for the CSI-RS resource. The control unit 210 may also decide different scrambling IDs for the plurality of resources based on the specific parameter. The plurality of CSI-RS sequences may also be based on the different scrambling IDs.

The setting information may include a plurality of scramble IDs. The control unit 210 may determine 1 scrambling ID from the plurality of scrambling IDs based on downlink control information. The plurality of CSI-RS sequences may also be based on the 1 scrambling ID.

(hardware construction)

The block diagram used in the description of the above embodiment shows blocks in functional units. These functional blocks (structural units) are implemented by any combination of at least one of hardware and software. The method of implementing each functional block is not particularly limited. That is, each functional block may be implemented by one apparatus that is physically or logically combined, or may be implemented by a plurality of apparatuses that are directly or indirectly (for example, by wire or wireless) connected to two or more apparatuses that are physically or logically separated. The functional blocks may also be implemented by combining the above-described apparatus or apparatuses with software.

Here, the functions include judgment, determination, judgment, calculation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, solution, selection, establishment, comparison, assumption, expectation, view, broadcast (broadcasting), notification (notification), communication (communicating), forwarding (forwarding), configuration (setting), reconfiguration (resetting), allocation (allocating, mapping), assignment (ordering), and the like, but are not limited to these. For example, a function block (a configuration unit) that realizes a transmission function may also be referred to as a transmission unit (transmitting unit), a transmitter (transmitter), or the like. Any of these methods is not particularly limited, as described above.

For example, the base station, the user terminal, and the like in one embodiment of the present disclosure may also function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 11 is a diagram showing an example of hardware configurations of a base station and a user terminal according to an embodiment. The base station 10 and the user terminal 20 may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like.

In addition, in the present disclosure, terms such as device, circuit, apparatus, section (section), unit, and the like can be substituted for each other. The hardware configurations of the base station 10 and the user terminal 20 may include one or more of the respective devices shown in the drawings, or may not include some of the devices.

For example, only one processor 1001 is shown, but there may be multiple processors. The processing may be executed by one processor, or may be executed by two or more processors simultaneously, sequentially, or by another method. Further, the processor 1001 may be implemented by one or more chips.

Each function of the base station 10 and the user terminal 20 is realized by, for example, reading specific software (program) into hardware such as the processor 1001 and the memory 1002, performing an operation by the processor 1001 to control communication via the communication device 1004, or controlling at least one of reading and writing of data in the memory 1002 and the storage 1003.

The processor 1001 controls the entire computer by operating an operating system, for example. The processor 1001 may be configured by a Central Processing Unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, a register, and the like. For example, at least a part of the control unit 110(210), the transmitting and receiving unit 120(220), and the like may be implemented by the processor 1001.

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

The Memory 1002 may be a computer-readable recording medium, and may be formed of at least one of a Read Only Memory (ROM), an Erasable Programmable ROM (EPROM), an Electrically Erasable Programmable ROM (EEPROM)), a Random Access Memory (RAM), or another suitable storage medium. The memory 1002 may also be referred to as a register, cache, main memory (primary storage), etc. The memory 1002 can store a program (program code), a software module, and the like that are executable to implement the wireless communication method according to one embodiment of the present disclosure.

The storage 1003 may be a computer-readable recording medium, and may be, for example, at least one of a flexible disk (flexible Disc), a Floppy (registered trademark) disk, an optical disk (e.g., a Compact Disc read only memory (CD-ROM)), a digital versatile Disc, a Blu-ray (registered trademark) disk, a removable disk (removable Disc), a hard disk drive, a smart card (smart card), a flash memory device (e.g., a card (card), a stick (stick), a key drive), a magnetic stripe (stripe), a database, a server, or other suitable storage media.

The communication device 1004 is hardware (transmission/reception device) for performing communication between computers via at least one of a wired network and a wireless network, and is also referred to as a network device, a network controller, a network card, a communication module, or the like. Communication apparatus 1004 may be configured to include a high-Frequency switch, a duplexer, a filter, a Frequency synthesizer, and the like, in order to realize at least one of Frequency Division Duplexing (FDD) and Time Division Duplexing (TDD), for example. For example, the transmitting/receiving unit 120(220), the transmitting/receiving antenna 130(230), and the like described above may be implemented by the communication device 1004. The transmitting and receiving unit 120(220) may be physically or logically separated from the transmitting unit 120a (220a) and the receiving unit 120b (220 b).

The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, and the like) that receives an input from the outside. The output device 1006 is an output device (for example, a display, a speaker, a Light Emitting Diode (LED) lamp, or the like) that outputs to the outside. The input device 1005 and the output device 1006 may be integrated (for example, a touch panel).

Further, the processor 1001, the memory 1002, and other devices are connected by a bus 1007 for communicating information. The bus 1007 may be formed by a single bus, or may be formed by different buses between the respective devices.

The base station 10 and the user terminal 20 may 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), or the like, and a part or all of the functional blocks may be implemented by the hardware. For example, the processor 1001 may also be implemented with at least one of these hardware.

(modification example)

In addition, terms described in the present disclosure and terms required for understanding the present disclosure may be replaced with terms having the same or similar meanings. For example, channels, symbols, and signals (signals or signaling) may be substituted for one another. Further, the signal may also be a message. The Reference Signal (Reference Signal) may also be referred to as RS for short, and may also be referred to as Pilot (Pilot), Pilot Signal, etc. depending on the applied standard. Further, Component Carriers (CCs) may also be referred to as cells, frequency carriers, Carrier frequencies, and the like.

A radio frame may also be made up of one or more periods (frames) in the time domain. Each of the one or more periods (frames) constituting the radio frame may also be referred to as a subframe. Further, a subframe may also be composed of one or more slots in the time domain. The subframe may also be a fixed time length (e.g., 1ms) independent of a parameter set (numerology).

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

The time slot may be formed of one or more symbols (Orthogonal Frequency Division Multiplexing (OFDM)) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, or the like) in the time domain. Further, the time slot may also be a time unit based on a parameter set.

A slot may also contain multiple mini-slots. Each mini-slot may also be made up 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 made up of a fewer number of symbols than a slot. PDSCH (or PUSCH) transmitted in a time unit larger than a mini slot may also be referred to as PDSCH (PUSCH) mapping type a. PDSCH (or PUSCH) transmitted using mini-slots may also be referred to as PDSCH (PUSCH) mapping type B.

The radio frame, subframe, slot, mini-slot, and symbol all represent a unit of time when a signal is transmitted. The radio frame, subframe, slot, mini-slot and symbol may also use other names corresponding to each. In addition, time units such as frames, subframes, slots, mini-slots, symbols, etc. in the present disclosure may be replaced with one another.

For example, one subframe may also be referred to as TTI, a plurality of consecutive subframes may also be referred to as TTI, and one slot or one mini-slot may also be referred to as TTI. That is, at least one of the subframe and TTI may be a subframe (1ms) in the conventional LTE, may be a period shorter than 1ms (for example, 1 to 13 symbols), or may be a period longer than 1 ms. The unit indicating TTI may be referred to as a slot, a mini slot, or the like, instead of a subframe.

Here, the TTI refers to, for example, the minimum time unit of scheduling in wireless communication. For example, in the LTE system, the base station performs scheduling for allocating radio resources (such as a frequency bandwidth and transmission power usable by each user terminal) to each user terminal in TTI units. In addition, the definition of TTI is not limited thereto.

The TTI may be a transmission time unit of a channel-coded data packet (transport block), code block, code word, or the like, or may be a processing unit of scheduling, link adaptation, or the like. In addition, when a TTI is given, a time interval (e.g., the number of symbols) to which a transport block, a code block, a codeword, or the like is actually mapped may be shorter than the TTI.

When one slot or one mini-slot is referred to as a TTI, one or more TTIs (i.e., one or more slots or one or more mini-slots) may be the minimum time unit for scheduling. The number of slots (the number of mini-slots) constituting the minimum time unit of the schedule may be controlled.

The TTI having a time length of 1ms 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 slot, etc. A TTI shorter than a normal TTI may also be referred to as a shortened TTI, a short TTI, a partial TTI, a shortened subframe, a short subframe, a mini-slot, a sub-slot, a slot, etc.

In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length exceeding 1ms, and a short TTI (e.g., a shortened TTI, etc.) may be interpreted as a TTI having a TTI length smaller than the long TTI and equal to or longer than 1 ms.

A Resource Block (RB) is a Resource allocation unit in the time domain and the frequency domain, and may include one or a plurality of consecutive subcarriers (subcarriers) in the frequency domain. The number of subcarriers included in an RB may be the same regardless of the parameter set, and may be 12, for example. The number of subcarriers included in the RB may also be decided based on the parameter set.

In addition, the RB may include one or more symbols in the time domain, and may have a length of one slot, one mini-slot, one subframe, or one TTI. One TTI, one subframe, and the like may be formed of one or more resource blocks.

In addition, one or more RBs may also be referred to as a Physical Resource Block (PRB), a subcarrier Group (SCG), a Resource Element Group (REG), a PRB pair, an RB pair, and the like.

Further, a Resource block may be composed of one or more Resource Elements (REs). For example, one RE may also be a radio resource region of one subcarrier and one symbol.

The Bandwidth Part (BWP) (which may be referred to as a partial Bandwidth) may also indicate a subset of consecutive common RBs (common resource blocks) for a certain parameter set in a certain carrier. Here, the common RB may also be determined by an index of an RB with reference to a common reference point of the carrier. PRBs may also be defined in a certain BWP and are numbered additionally within the BWP.

The BWP may include UL BWP (UL BWP) and DL BWP (DL BWP). One or more BWPs may also be set for the UE within 1 carrier.

At least one of the set BWPs may be active, and the UE may not expect to transmit and receive a specific signal/channel other than the active BWP. In addition, "cell", "carrier", and the like in the present disclosure may also be interpreted as "BWP".

The above-described configurations of radio frames, subframes, slots, mini slots, symbols, and the like are merely examples. For example, the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of mini-slots included in a slot, the number of symbols and RBs included in a slot or mini-slot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the Cyclic Prefix (CP) length, and other configurations can be variously changed.

In addition, information, parameters, and the like described in the present disclosure may be expressed by absolute values, relative values to specific values, or other corresponding information. For example, the radio resource may also be indicated by a specific index.

In the present disclosure, the names used for the parameters and the like are not limitative names in all aspects. Further, the mathematical expressions and the like 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 names in all respects.

Information, signals, and the like described in this disclosure may be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, and the like that may be referenced throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or photons, or any combination thereof.

Information, signals, and the like can be output to at least one of a higher layer (upper layer) to a lower layer (lower layer) and a lower layer to a higher layer. Information, signals, and the like may be input and output via a plurality of network nodes.

The input/output information, signals, and the like may be stored in a specific location (for example, a memory) or may be managed by a management table. The input/output information, signals, and the like may be overwritten, updated, or appended. The outputted information, signals, etc. may also be deleted. The input information, signals, etc. may also be transmitted to other devices.

The information notification is not limited to the embodiment and embodiment described in the present disclosure, and may be performed by other methods. For example, the Information notification in the present disclosure may be implemented by physical layer signaling (e.g., Downlink Control Information (DCI)), Uplink Control Information (UCI)), higher 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.

In addition, the physical Layer signaling may also be referred to as Layer 1/Layer 2(L1/L2)) control information (L1/L2 control signal), L1 control information (L1 control signal), and the like. The RRC signaling may be referred to as an RRC message, and may be, for example, an RRC Connection Setup (RRC Connection Setup) message, an RRC Connection Reconfiguration (RRC Connection Reconfiguration) message, or the like. The MAC signaling may be notified using a MAC Control Element (CE), for example.

Note that the notification of the specific information (for example, the notification of "X") is not limited to an explicit notification, and may be performed implicitly (for example, by not performing the notification of the specific information or by performing the notification of other information).

The decision may be made by a value (0 or 1) represented by one bit, by a true-false value (boolean) represented by true (true) or false (false), or by a comparison of values (e.g., with a specific value).

Software, whether referred to as software (software), firmware (firmware), middleware-ware (middle-ware), microcode (micro-code), hardware description language, or by other names, should be broadly construed to mean instructions, instruction sets, code (code), code segments (code segments), program code (program code), programs (program), subroutines (sub-program), software modules (software module), applications (application), software applications (software application), software packages (software packages), routines (subroutine), subroutines (sub-routine), objects (object), executables, threads of execution, processes, functions, or the like.

Software, instructions, information, and the like may also be transmitted or received via a transmission medium. For example, where the software is transmitted from a website, server, or other remote source (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 and wireless technologies is included within the definition of transmission medium.

The terms "system" and "network" as used in this disclosure can be used interchangeably. "network" may also mean a device (e.g., a base station) included in a network.

In the present disclosure, terms such as "precoding", "precoder", "weight", "Quasi-Co-location (qcl))", "Transmission Configuration Indication state (TCI state)", "spatial relationship", "spatial filter", "Transmission power", "phase rotation", "antenna port group", "layer", "rank", "resource set", "resource group", "beam width", "beam angle", "antenna element", "panel", and the like can be used interchangeably.

In the present disclosure, terms such as "Base Station (BS)", "wireless Base Station", "fixed Station (fixed Station)", "NodeB", "enb (enodeb)", "gnb (gtnodeb)", "access point (access point)", "Transmission Point (TP)", "Reception Point (RP)", "Transmission Reception Point (TRP)", "panel", "cell", "sector", "cell group", "carrier", "component carrier" can be used interchangeably. There are also cases where a base station is referred to by terms such as macrocell, smallcell, femtocell, picocell, and the like.

The base station can accommodate one or more (e.g., three) cells. When a base station accommodates a plurality of cells, the entire coverage area of the base station can be divided into a plurality of smaller areas, and each smaller area can also provide communication services through a base station subsystem (e.g., an indoor small base station (Remote Radio Head (RRH))). The term "cell" or "sector" refers to a portion or the entirety of the coverage area of at least one of the base stations and base station subsystems that is in communication service within the coverage area.

In the present disclosure, terms such as "Mobile Station (MS)", "User terminal (User terminal)", "User Equipment (UE))", "terminal" and the like are used interchangeably.

In some cases, a mobile station is also referred to as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless communications device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset (hand set), user agent, mobile client, or some other suitable terminology.

At least one of the base station and the mobile station may also be referred to as a transmitting apparatus, a receiving apparatus, a wireless communication apparatus, and the like. At least one of the base station and the mobile station may be a device mounted on a mobile body, a mobile body main body, or the like. The mobile body may be a vehicle (e.g., a vehicle, an airplane, etc.), may be a mobile body that moves in an unmanned manner (e.g., a drone (a drone), an autonomous vehicle, etc.), or may be a robot (manned or unmanned). At least one of the base station and the mobile station 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 be an Internet of Things (IoT) device such as a sensor.

In addition, the base station in the present disclosure may also be interpreted as a user terminal. For example, the embodiments/implementation manners of the present disclosure may also be applied to a structure in which communication between a base station and a user terminal is replaced with communication between a plurality of user terminals (for example, may also be referred to as Device-to-Device (D2D)), Vehicle networking (V2X), and the like). In this case, the user terminal 20 may have the functions of the base station 10 described above. The expressions such as "uplink" and "downlink" can also be interpreted as expressions (for example, "side") corresponding to communication between terminals. For example, an uplink channel, a downlink channel, and the like may also be interpreted as a side channel.

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

In the present disclosure, the operation performed by the base station is assumed to be performed by an upper node (upper node) in some cases. Obviously, in a network including one or more network nodes (network nodes) having a base station, various actions 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, considering a Mobility Management Entity (MME), a Serving-Gateway (S-GW), and the like, but not limited thereto), or a combination thereof.

The embodiments and embodiments described in the present disclosure may be used alone, may be used in combination, or may be switched to use with execution. In addition, the processing procedures, sequences, flowcharts, and the like of the respective embodiments and embodiments described in the present disclosure may be reversed in order as long as they are not inconsistent. For example, elements of various steps are presented in the order illustrated for the method described in the present disclosure, but the method is not limited to the specific order presented.

The embodiments/embodiments described in the present disclosure may also be applied to Long Term Evolution (LTE), LTE-Advanced (LTE-a), LTE-Beyond (LTE-B), SUPER3G, IMT-Advanced, fourth generation mobile communication system (4th generation mobile communication system (4G)), fifth generation mobile communication system (5th generation mobile communication system (5G)), sixth generation mobile communication system (6th generation mobile communication system (6G)), xth generation mobile communication system (xG) (xG (x is, for example, an integer number of decimal)), Future Radio Access (Future Access (FRA)), New Radio Access Technology (New-Radio Access Technology (RAT)), New Radio Access (New RAT (NR))), and so on, New generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11(Wi-Fi (registered trademark)), IEEE802.16(WiMAX (registered trademark)), IEEE 802.20, Ultra wideband (uwb), Bluetooth (registered trademark), systems using other appropriate wireless communication methods, next generation systems expanded based on these methods, and the like. Further, multiple systems may also be applied in combination (e.g., LTE or LTE-a, combination with 5G, etc.).

The term "based on" used in the present disclosure does not mean "based only" unless otherwise specified. In other words, the expression "based on" means both "based only on" and "based at least on".

Any reference to the use of the terms "first," "second," etc. in this disclosure does not fully define the amount or order of such elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, reference to first and second elements does not imply that only two elements may be used or that the first element must somehow override the second element.

The term "determining" as used in this disclosure encompasses a wide variety of actions in some cases. For example, "determination (decision)" may be regarded as a case where "determination (decision)" is performed on determination (rounding), calculation (calculating), processing (processing), derivation (deriving), investigation (investigating), search (looking up), search, inquiry (query)) (for example, search in a table, a database, or another data structure), confirmation (authenticating), and the like.

The "determination (decision)" may be regarded as a case of "determining (deciding)" on reception (e.g., reception information), transmission (e.g., transmission information), input (input), output (output), access (e.g., access to data in a memory), and the like.

The "determination (decision)" may be also regarded as a case of performing "determination (decision)" on solution (resolving), selection (selecting), selection (breathing), establishment (evaluating), comparison (comparing), and the like. That is, "judgment (decision)" may also be regarded as a case where "judgment (decision)" is performed on some actions.

The term "determination (decision)" may be interpreted as "assumption", "expectation", "consideration", and the like.

The "maximum transmission power" in the present disclosure may mean "the maximum value of transmission power", a nominal maximum transmission power (the nominal UE maximum transmit power), or a nominal maximum transmission power (the rated UE maximum transmit power).

The terms "connected" and "coupled" or any variation thereof used in the present disclosure mean all connections or couplings between two or more elements directly or indirectly, and can include a case where one or more intermediate elements exist between two elements "connected" or "coupled" to each other. The combination or connection between the elements may be physical, logical, or a combination of these. For example, "connection" may also be interpreted as "access".

In the present disclosure, where two elements are connected, it can be considered to be "connected" or "joined" to each other using more than one wire, cable, printed electrical connection, or the like, and as several non-limiting and non-inclusive examples, using electromagnetic energy having a wavelength in the radio frequency domain, the microwave region, the optical (both visible and invisible) region, or the like.

In the present disclosure, the term "a is different from B" may 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", "associated", and the like are also to be construed as "different" in the same way.

In the present disclosure, when the terms "including", and variations thereof are used, these terms are meant to have inclusive meanings, as with the term "comprising". Further, the term "or" as used in this disclosure does not mean exclusive or.

In the present disclosure, for example, in the case where articles are added by translation as in a, an, and the in english, the present disclosure may also include a case where nouns following these articles are plural.

Although the invention according to the present disclosure has been described in detail above, it is obvious to those skilled in the art that the invention according to the present disclosure is not limited to the embodiments described in the present disclosure. The invention according to the present disclosure can be implemented as modifications and variations without departing from the spirit and scope of the invention defined by the claims. Therefore, the description of the present disclosure is for illustrative purposes and does not have any limiting meaning to the invention to which the present disclosure relates.

Claims (6)

1. A terminal, having:

a reception unit configured to receive setting information for using different CSI-RS sequences, which are CSI-reference signal sequences, among a plurality of resources, which are each any one of a CSI-RS port, a Code Division Multiplexing (CDM) group, and a cell; and

a control unit which performs measurement using a plurality of CSI-RS sequences based on the setting information.

2. The terminal of claim 1, wherein,

the setting information contains scrambling IDs different for the plurality of resources,

the plurality of CSI-RS sequences is based on the different scrambling IDs.

3. The terminal of claim 1, wherein,

the setting information includes specific parameters for the CSI-RS resource,

the control unit decides a scramble ID different for the plurality of resources based on the specific parameter,

the plurality of CSI-RS sequences is based on the different scrambling IDs.

4. The terminal of claim 1, wherein,

the setting information includes a plurality of scramble IDs,

the control unit decides 1 scramble ID from the plurality of scramble IDs based on downlink control information,

the plurality of CSI-RS sequences is based on the 1 scrambling ID.

5. A wireless communication method of a terminal, comprising:

receiving setting information for using different channel state information-reference signal sequences, i.e., CSI-RS sequences, among a plurality of resources, each of which is any one of a CSI-RS port, a Code Division Multiplexing (CDM) group, and a cell; and

a step of performing measurement using a plurality of CSI-RS sequences based on the setting information.

6. A base station having:

a transmitting unit configured to transmit setting information for using different CSI-RS sequences, which are channel state information-reference signal sequences, among a plurality of resources, which are each any one of a CSI-RS port, a CDM group, which is a code division multiplexing group, and a cell; and

and a control unit which generates a plurality of CSI-RS sequences based on the setting information.

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