WO2023135801A1

WO2023135801A1 - Terminal, wireless communication method, and base station

Info

Publication number: WO2023135801A1
Application number: PCT/JP2022/001378
Authority: WO
Inventors: 春陽越後; 浩樹原田; チーピンピ; ジンワン; ランチン
Original assignee: 株式会社Ｎｔｔドコモ
Priority date: 2022-01-17
Filing date: 2022-01-17
Publication date: 2023-07-20

Abstract

A terminal according to one embodiment of the present disclosure includes: a reception unit for receiving information pertaining to the frequency domain density of a channel-state information reference signal; and a control unit that, if the frequency domain density is smaller than 1, controls the reception of the channel-state information reference signal for which supported is mapping of at least one of a different port and a different CDM group to a plurality of resource blocks.

Description

Terminal, wireless communication method and base station

The present disclosure relates to terminals, wireless communication methods, and base stations in next-generation mobile communication systems.

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

LTE successor systems (for example, 5th generation mobile communication system (5G), 5G+ (plus), 6th generation mobile communication system (6G), New Radio (NR), 3GPP Rel. 15 and later) are also being considered. .

Regarding future wireless communication technology, the use of artificial intelligence (AI) technology such as machine learning (ML) is being considered for network/device control and management. For example, AI/ML interpolation is being used to reduce resources for reference signals (RS).

However, the specific content of the RS resource reduction has not yet progressed. If these are not defined appropriately, highly efficient resource utilization cannot be achieved, and there is a risk that improvements in communication throughput or communication quality will be suppressed.

Therefore, one of the objects of the present disclosure is to provide a terminal, a wireless communication method, and a base station that can realize suitable use of RS resources.

A terminal according to an aspect of the present disclosure includes a receiver that receives information about the frequency domain density of a channel state information reference signal, and when the frequency domain density is less than 1, different ports and different CDM and a control unit for controlling reception of the channel state information reference signals for which at least one mapping of groups is supported.

According to one aspect of the present disclosure, suitable use of RS resources can be realized.

FIG. 1 is a diagram showing an example of a CSI-RS resource mapping pattern. FIG. 2 is a diagram illustrating an example of higher layer parameters related to CSI-RS resource mapping information. FIG. 3 is a diagram showing an example of CSI-RS positions in slots and RBs. 4A and 4B are diagrams illustrating an example of CSI-RS resource mapping for a specific CSI-RS location configuration (eg, row). FIG. 5 is a diagram illustrating another example of CSI-RS resource mapping for a specific CSI-RS location configuration (eg, row). 6A to 6C are diagrams showing examples of CSI-RS resource mapping according to aspect 2-1 of the second embodiment. FIG. 7 is a diagram showing an example of a method for indicating RB positions of CSI-RS resources according to aspect 2-1 of the second embodiment. 8A to 8C are diagrams showing examples of CSI-RS resource mapping according to aspect 2-2 of the second embodiment. 9A and 9B are diagrams showing other examples of CSI-RS resource mapping according to aspect 2-2 of the second embodiment. 10A and 10B are diagrams showing other examples of CSI-RS resource mapping according to aspect 2-2 of the second embodiment. 11A and 11B are diagrams showing other examples of CSI-RS resource mapping according to aspect 2-2 of the second embodiment. FIG. 12 is a diagram showing a specific CSI-RS position configuration (eg, row) according to aspect 2-2 of the second embodiment. FIG. 13 is a diagram showing another example of CSI-RS resource mapping according to aspect 2-2 of the second embodiment. 14A and 14B are diagrams showing an example of CSI-RS resource mapping according to a combination of aspects 2-1 and 2-2 of the second embodiment. 15A and 15B are diagrams showing other examples of CSI-RS resource mapping according to the combination of aspects 2-1 and 2-2 of the second embodiment. 16A and 16B are diagrams showing an example of CSI-RS resource mapping according to aspect 2-3 of the second embodiment. FIG. 17 is a diagram showing an example of upper layer parameters related to CSI-RS resource mapping information according to aspect 2-3 of the second embodiment. 18A to 18D are diagrams showing other examples of CSI-RS resource mapping according to aspect 2-3 of the second embodiment. 19A and 19B are diagrams showing other examples of CSI-RS resource mapping according to aspect 2-3 of the second embodiment. 20A and 20B are diagrams showing an example of CSI-RS resource mapping according to a combination of aspects 2-2 and 2-3 of the second embodiment. 21A and 21B are diagrams showing an example of CSI-RS resource mapping according to a combination of aspects 2-1, 2-2, and 2-3 of the second embodiment. FIG. 22 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment; FIG. 23 is a diagram illustrating an example of the configuration of a base station according to one embodiment. FIG. 24 is a diagram illustrating an example of the configuration of a user terminal according to an embodiment; FIG. 25 is a diagram illustrating an example of hardware configurations of a base station and a user terminal according to an embodiment. FIG. 26 is a diagram illustrating an example of a vehicle according to one embodiment;

(CSI-RS)
Rel. For at least one of channel state information (CSI) acquisition, beam management (BM), beam failure recovery (BFR), time and frequency fine tracking in 15/16 NR CSI-RS, for example, is used as the DL RS of.

　Rel. In 15/16 NR, multiple-port CSI-RS uses at least one of frequency division multiplexing (FDM), time division multiplexing (TDM), code division multiplexing (CDM (frequency domain OCC, time domain OCC)). are multiplexed. CSI-RS supports up to 32 ports.

　Multi-port CSI-RS is used, for example, for orthogonalization of multi-input multi-output (MIMO) layers. For example, for single-user MIMO, different DMRS ports are configured for each layer. For multi-user MIMO, a different DMRS port is set for each layer in one UE and for each UE.

　Rel. In 15/16 NR, CSI-RS supports up to 32 ports with at least one of time domain OCC and frequency domain OCC (up to 4 in time direction and up to 2 in frequency direction), FDM, TDM. CSI-RS supports periodic, semi-persistent and aperiodic transmission. The CSI-RS frequency density is configurable to adjust the overhead and CSI estimation accuracy.

<CSI-RS time domain>
Periodic/semi-persistent CSI-RS is set with a predetermined periodicity (for example, Periodicity). Rel. 16 NR, the predetermined periodicity is set in slot units, specifically any of 4/5/8/10/16/20/32/40/64/80/160/320/640 slots. is set. For aperiodic CSI-RS, all aperiodic CSI-RS resources within the same resource set are transmitted in the same slot.

<CSI-RS resource mapping pattern>
Rel. In 15/16 NR, CSI-RS supports 1, 2, 4, 8, 12, 16, 24, 32 ports (antenna ports, CSI-RS ports). Also, CSI-RS supports 3, 1, and 0.5 as frequency domain density (eg, frequency domain density).

　Supports a non-CDM (for example, no CDM) type and a CDM type as CSI-RS CDM types. Supported CDM types include fd-CDM2, cdm4-FD2-TD2, and cdm8-FD2-TD4 (see FIG. 1). fd-CDM2 multiplexes 2-port CSI-RS in the same time and frequency by multiplying a frequency domain (FD)-orthogonal cover code (OCC) of length 2 in RE units (FD2 ). cdm4 multiplexes 4-port CSI-RS in the same time and frequency by multiplying the FD-OCC of length 2 by the time domain (TD)-OCC of length 2 on a RE-by-symbol basis (cdm4- FD2-TD2). cdm8 multiplexes 8-port CSI-RS in the same time and frequency by multiplying FD-OCC of length 2 and TD-OCC of length 4 in RE unit symbol units (cdm8-FD2-TD4). .

CSI-RS supports 1 or 2 starting symbols in one slot for OFDM symbol allocation (eg, OFDM symbol allocation), and supports allocation from each starting symbol to 1/2/4 adjacent symbols.

　CSI-RS frequency domain allocation may be indicated by a bitmap (eg, bitmap indication). For example, the frequency domain location of CSI-RS (eg, frequency-domain location) is based on a bitmap provided by a higher layer parameter (eg, frequencyDomainAllocation) for CSI-RS resources and a predetermined value (eg, ki). may be determined by frequencyDomainAllocation may be included in higher layer parameters related to CSI-RS resource mapping (eg, CSI-RS-ResourceMapping IE (see FIG. 2) or CSI-RS-ResourceConfigMobility IE).

The predetermined value (eg, ki) for the frequency position of the CSI-RS (eg, CDM group) within the slot may be a value defined in the table for CSI-RS position (see FIG. 3).

FIG. 3 is a diagram showing an example of CSI-RS locations within a slot. Each row of the table has row number, port number, frequency domain density, CDM type, time and frequency (time/frequency) location (component resource (CDM group) location (k bar, l bar)), CDM group index. , denote each resource position ((RE, symbol), (k′, l′)) in the component resource. Here, the time/frequency position is the position of time and frequency resources (component resources) of the CSI-RS corresponding to one port. The k-bar is a notation with an overline on the "k". The k bar indicates the starting resource element (RE) index of the component resource, and the l bar indicates the starting symbol (OFDM symbol) index of the component resource.

In each row of the CSI-RS location table shown in FIG. 3, the following relationships may be defined.
Row 1 (row#1): [b3...b0], k _i-1 =f(i)
Row #2: [b11...b0], k _i-1 =f(i)
Row #4: [b2...b0], k _i-1 =4f(i)
Other rows (cases other than row #1/#2/#4): [b5...b0], k _i-1 =2f(i)
f(i) indicates the number of the i-th bit of the bitmap (eg, frequencyDomainAllocation) set to 1, and the ceiling function of 1/ρ among the resource blocks configured for CSI-RS reception by the UE (eg, ceil(1/ρ)).

For example, FIG. 4A shows an example of CSI-RS positions corresponding to row #1. Here, the number of ports is 1, the density is 3, and there is no CDM.

FIG. 4B shows an example of CSI-RS positions corresponding to row #4. Here, the number of ports is 4, the density is 1, and the case is fd-CDM2. In the frequency domain and time domain of 1 PRB x 1 slot, component resources of 2 subcarriers x 1 symbol are double-multiplexed (FDM) in the frequency domain and single-multiplexed in the time domain, resulting in 2 x 1 Component resources are mapped. Furthermore, two CSI-RSs are multiplexed (CDM) by multiplying the CSI-RS in each component resource by the FD-OCC of length 2 subcarriers. CSI-RS includes two CDM groups, for example, a first CDM group (CDM group #0) includes two ports (eg, port 3000, port 3001), and a second CDM group (CDM group #0) includes #1) includes two ports (eg, port 3002 and port 3003).

FIG. 5 shows an example of CSI-RS positions corresponding to row #17. Here, the number of ports is 32, the density is 1 (or 0.5), and the case is cdm4-FD2-TD2. In the frequency domain and time domain of 1 PRB x 1 slot, component resources of 2 subcarriers x 2 symbols are 4-multiplexed (FDM) in the frequency domain and 2-multiplexed (TDM) in the time domain, resulting in 4 x Two component resources are mapped. Furthermore, CSI-RS in each component resource is multiplied by FD-OCC of length 2 subcarriers and TD-OCC of length 2 symbols, so that 4 CSI-RS are multiplexed (CDM) be done. CSI-RS includes 8 CDM groups, and each CDM group includes 4 ports.

(Application of artificial intelligence (AI) technology to wireless communication)
As for future wireless communication technology, utilization of AI technology for control and management of networks/devices is under consideration.

For example, for future wireless communication technologies, especially in beam-based communication, it is desired to improve the accuracy of channel estimation (also referred to as channel measurement) for beam management, decoding of received signals, and the like. .

For channel estimation, for example, channel state information reference signal (CSI-RS), synchronization signal (SS), synchronization signal/broadcast channel (Synchronization Signal/Physical Broadcast Channel (SS/PBCH)) block, reference for demodulation It may be performed using at least one of a signal (DeModulation Reference Signal (DMRS)), a measurement reference signal (Sounding Reference Signal (SRS)), and the like.

Regarding future wireless communication technology, the use of artificial intelligence (AI) technology such as machine learning (ML) is being considered for network/device control and management.

For example, AI/ML complementation is being used to reduce resources for reference signals (RS) while maintaining channel estimation accuracy.

For example, when learning using AI / ML is not performed (not finished) at the terminal (also referred to as user terminal, User Equipment (UE), etc.) / base station, RS reception measurement capable of high channel estimation accuracy, Alternatively, in order to achieve accurate RS reception measurements used for learning, the following requirements may be required:
- Transmitting and receiving RS in a wide band (contributes to the improvement of reception quality),
- Repeated transmission of RSs to combine received channels/signals (combined reception) on the receiving side (contributes to improved reception quality);
• High time/frequency density of RS resources (contributes to obtaining good time/frequency correlation).

Based on these, it is thought that the appropriate RS allocation will differ depending on whether AI/ML has been sufficiently trained or not. Therefore, it is desirable to introduce a methodology framework to dynamically allocate appropriate RS resources.

However, the specific content of the framework has not yet been considered. If these are not defined appropriately, highly efficient resource utilization cannot be achieved, and there is a risk that improvements in communication throughput or communication quality will be suppressed.

In addition, in the existing specifications (before Rel.16), the setting of the mapping of the reference signal (eg, CSI-RS) is specified to be controlled based on predetermined periodicity and predetermined resource mapping. ing.

In order to achieve highly efficient resource utilization as described above, the overhead of reference signals (eg, CSI-RS/CSI-RS resources) can be reduced by configuring more flexible and dynamic reference signal mapping. is desirable.

Therefore, the present inventors studied a suitable RS resource allocation/utilization method and conceived the present embodiment.

Note that each embodiment of the present disclosure may be applied when AI/ML/prediction is not used. In this case, it is possible to reduce the delay/overhead and change the configuration of the RS without RRC reconfiguration.

In one embodiment of the present disclosure, the UE/BS trains the ML model in training mode and implements the ML model in test mode (also called test mode, testing mode, etc.). In the test mode, validation of the accuracy of the ML model trained in the training mode may be performed.

In the present disclosure, the UE/BS inputs channel state information, reference signal measurements, etc. to the ML model to obtain highly accurate channel state information/measurements/beam selection/position, future channel state information / Radio link quality etc. may be output.

It should be noted that in the present disclosure, AI may be read as an object (also called object, object, data, function, program, etc.) having (implementing) at least one of the following characteristics:
Estimates based on observed or collected information;
- Choices based on information observed or collected;
• Predictions based on observed or collected information.

In the present disclosure, the object may be, for example, a terminal, a device such as a base station, or a device. Also, the object may correspond to a program included in the device.

Also, in this disclosure, an ML model may be read as an object that has (enforces) at least one of the following characteristics:
Generating an estimate by feeding,
Informed to predict estimates;
・Discover characteristics by giving information,
• Selecting actions by giving information.

Also, in the present disclosure, the ML model may be read as at least one of AI model, predictive analytics, predictive analysis model, and the like. Also, the ML model may be derived using at least one of regression analysis (e.g., linear regression analysis, multiple regression analysis, logistic regression analysis), support vector machines, random forests, neural networks, deep learning, and the like. In this disclosure, model may be translated as at least one of encoder, decoder, tool, and the like.

　The ML model outputs at least one information such as estimated value, predicted value, selected action, classification, etc., based on the input information.

Hereinafter, embodiments according to the present disclosure will be described in detail with reference to the drawings. The wireless communication method according to each embodiment may be applied independently, or may be applied in combination.

In the following embodiments, the UE and the BS are the relevant subjects in order to explain the ML model for communication between the UE and the BS, but the application of each embodiment of the present disclosure is not limited to this. For example, for communication between different subjects (eg, UE-UE communication), the UE and BS in the following embodiments may be read as the first UE and the second UE. In other words, any UE, BS, etc. in this disclosure may be read as any UE/BS.

In the present disclosure, "A/B" and "at least one of A and B" may be read interchangeably, and "A/B/C" and "at least one of A, B and C" may be interchanged. may be

In the present disclosure, activate, deactivate, indicate (or indicate), select, configure, update, determine, etc. may be read interchangeably. In the present disclosure, supporting, controlling, controllable, operating, and capable of operating may be read interchangeably.

In the present disclosure, Radio Resource Control (RRC), RRC parameters, RRC messages, higher layer parameters, information elements (IEs), and settings may be read interchangeably. In the present disclosure, Medium Access Control Control Element (MAC Control Element (CE)), update command, and activation/deactivation command may be read interchangeably.

In the present disclosure, Panel, UE Panel, Panel Group, Beam, Beam Group, Precoder, Uplink (UL) transmitting entity, TRP, Spatial Relationship Information (SRI), Spatial Relationship, SRS Resource Indicator (SRI), SRS resource, control resource set (control resource set (CORESET)), physical downlink shared channel (PDSCH), codeword, base station, reference signal, predetermined antenna port (for example, demodulation reference signal (DMRS) ) port), a predetermined antenna port group (e.g., DMRS port group), a predetermined group (e.g., Code Division Multiplexing (CDM) group, a predetermined reference signal group, a CORESET group), a predetermined resource ( predetermined reference signal resource), predetermined resource set (e.g., predetermined reference signal resource set), CORESET pool, PUCCH group (PUCCH resource group), spatial relationship group, downlink Transmission Configuration Indication state (TCI state) (DL TCI state), uplink TCI state (UL TCI state), unified TCI state, common TCI state, Quasi-Co-Location (QCL), QCL assumptions and the like may be read interchangeably.

In the present disclosure, indexes, IDs, indicators, and resource IDs may be read interchangeably. In the present disclosure, sequences, lists, sets, groups, groups, clusters, subsets, etc. may be read interchangeably.

In the present disclosure, a beam report may be read interchangeably as a beam measurement report, a CSI report, a CSI measurement report, a predicted beam report, a predicted CSI report, and the like.

In the present disclosure, CSI-RS refers to Non Zero Power (NZP) CSI-RS, Zero Power (ZP) CSI-RS and CSI Interference Measurement (CSI-IM)). At least one may be read interchangeably.

In the present disclosure, measured/reported RS may mean RS measured/reported for beam reporting.

In addition, in the present disclosure, timing, time, time, slot, subslot, symbol, subframe, etc. may be read interchangeably.

In the present disclosure, directions, axes, dimensions, polarizations, polarization components, etc. may be read interchangeably.

In the present disclosure, estimation, prediction, and inference may be read interchangeably. Also, in the present disclosure, estimate, predict, and infer may be read interchangeably.

In addition, in the present disclosure, the RS may be, for example, CSI-RS, SS/PBCH block (SS block (SSB)), and the like. Also, the RS index may be a CSI-RS resource indicator (CRI), an SS/PBCH block resource indicator (SS/PBCH block indicator (SSBRI)), or the like.

In the present disclosure, CSI feedback, CSI feedback information, CSI report, CSI report, CSI transmission, CSI information, CSI, etc. may be read interchangeably.

Also, in the present disclosure, a subband may be interchanged with a physical resource block (PRB), a subcarrier, an arbitrary frequency resource unit, or the like.

(Wireless communication method)
As a (specific) reference signal described in each embodiment of the present disclosure, the channel state information reference signal (CSI-RS) is taken as an example, but it is not limited to this, and may be applied to any reference signal.

In the present disclosure, assigning reference signals, mapping, transmitting, and receiving may be read interchangeably.

<First Embodiment>
In the first embodiment, time domain configuration of CSI-RS resources will be described.

Setting/applying a value larger than the maximum periodicity in existing systems (eg, before Rel. 16) as the CSI-RS resource period/periodicity may be supported. For example, setting/applying a predetermined periodicity value greater than 640 slots as the CSI-RS resource periodicity/periodicity may be supported. The predetermined periodicity value may be, for example, 1280 slots, 2560 slots, and so on.

In this way, it is possible to reduce the overhead of CSI-RS resources by supporting the setting/application of values larger than existing systems as the periodicity of CSI-RS resources.

Also, a new CSI-RS resource offset value (for example, time offset value) may be set for a predetermined periodicity value. For example, a setting of 0 to (X-1) slots may be supported as an offset corresponding to periodic X slots.

The predetermined periodicity value may be set in a granularity/unit other than the slot. For example, using a unit having a granularity larger than a slot (eg, subframe/frame/ms/s/minis/hours), the periodicity of CSI-RS resources (eg, a predetermined periodicity value) can be set. may be supported. In this case, the periodicity offset value may be set with the granularity of the slot, or may be set with a new granularity (for example, a unit having a granularity larger than that of the slot).

For example, an offset corresponding to subframes/frames/ms/s/minis/hours of periodicity X may be set from 0 to (X-1) slots. Alternatively, offsets corresponding to subframes/frames/ms/s/minis/hours of periodicity X may be set from 0 to (X−1) subframes/frames/ms/s/minis/hours. The granularity/unit of periodicity and the granularity/unit of offset may be commonly set/applied.

By supporting granularity larger than the slot as the periodicity value/offset value of CSI-RS, even if the periodicity value/offset value increases, the increase in overhead of higher layer signaling is suppressed. It becomes possible to

<Second embodiment>
In the second embodiment, frequency domain configuration of CSI-RS resources will be described. Note that the configuration shown in the second embodiment may be applied in combination with the content shown in the first embodiment as appropriate.

<<Aspect 2-1>>
Setting/applying values different from existing system values (eg, 3, 1, 0.5) as values of the frequency domain density (eg, frequency domain density) of CSI-RS resources may be supported. The newly set/applied frequency domain density value may be applied to each row of the CSI-RS resource positions shown in FIG. 3, or may be selectively applied to some rows. .

Alternatively, the newly set/applied frequency domain density value is applied to a new row different from the row (eg, row #1 to row #18) indicating the CSI-RS resource position shown in FIG. good. In the present disclosure, row may be read as a configuration of CSI-RS locations (eg, CSI-RS locations within a slot) or CSI-RS location candidates.

As a new frequency domain density (eg, ρ_new) different from the frequency domain density of the existing system (eg, 3, 1, 0.5), at least one of the following options 2-1-1 to 2-1-2 may be applied.

[Option 2-1-1]
A new frequency domain density (eg, ρ_new) may be defined as 1/N. N may be a predetermined integer value. Alternatively, N may be a multiple of 2/4/8/12 . . . For example, the new frequency domain density value 1/N may be less than 0.5.

If the new frequency domain density (eg, ρ_new) is 1/N, the CSI-RS resource mapping pattern (eg, row) is N (=1/ρ_new) resource blocks (eg, RB) only once It can mean repeated.

FIG. 6A shows an example of CSI-RS resource mapping patterns (or parameters) corresponding to row #2, and FIG. 6B shows an example of CSI-RS positions corresponding to row #2. Here, the number of ports is 1, the density is 1/4 (N=4, ρ_new=1/4), and no CDM is shown. That is, the CSI-RS resource mapping pattern (here, row #2) is repeated once every four resource blocks (eg, RBs).

The N for frequency domain density may be notified to the UE through higher layer signaling.

[Option 2-1-2]
A new frequency domain density (eg, ρ_new) may be defined in M/N. M may be a predetermined integer value and N may be a predetermined integer value or a multiple of 2/4/8/12 . M and N may be set separately, and may be defined by M<N (or M>N). For example, the new frequency domain density value M/N may be less than or greater than 0.5. Also, 1/ρ may be an integer value or may not be an integer value.

The M/N for frequency domain density may be notified to the UE by higher layer signaling. Note that the values of M and N may be notified to the UE, respectively. In this case, by controlling the values of M and N, it is possible to flexibly set the frequency domain density.

If the new frequency domain density value (eg, ρ_new) is M/N, the CSI-RS resource mapping pattern is N (=1/ρ_new) resource blocks (eg, RB) with M RBs every It can mean repeated. The M RBs may be contiguous RBs or non-contiguous RBs.

FIG. 6C shows an example of CSI-RS positions corresponding to row #2. Here, the number of ports is 1, the density is 2/5 (M=2, N=5, ρ_new=2/5), and no CDM is shown. That is, the CSI-RS resource mapping pattern is repeated by 2 RBs every 5 resource blocks (eg, RBs). Here, a case is shown in which two RBs that are repeated every five RBs are non-consecutive, but the present invention is not limited to this.

If the new frequency domain densities indicated in Option 2-1-1/Option 2-1-2 are supported, the RB positions occupied by CSI-RS (eg, occupied RB position(s)) are defined in the specification. may be specified, or may be directed to the UE from the network. The RB position occupied by CSI-RS may be read as RB position where CSI-RS is allocated/RB position mapped/RB position allocated.

《Alt 2-1-1》
A starting RB position within the N RBs may be defined/indicated. For example, the starting RB position offset for the lowest (or highest) RB index among the N RBs may be defined/indicated.

In Option 2-1-1, the indicated starting RB position may mean the RB position occupied by CSI-RS.

In Option 2-1-2, M RBs occupied by CSI-RS may be frequency-allocated by providing a fixed offset (eg, Y RB offsets) between RBs occupied by CSI-RS. . In this case, Y may be set by higher layer signaling or defined in the specification. Y defined by the specification (eg, Y=0) may mean that consecutive RBs among the N RBs are allocated to the CSI-RS.

If the start RB position is not indicated/set, a default start position may be applied. The default starting position may be, for example, the lowest (or highest) RB index among N RBs.

The starting RB position among N RBs may be included in a table used for CSI-RS resource mapping positions, or may be included in higher layer parameters for CSI-RS resource mapping.

《Alt 2-1-2》
In order to indicate the RBs occupied by CSI-RS for every N RBs, a bitmap indicating RB positions (eg, RB positions) for the new frequency domain density values may be set (Fig. 7).

For example, in Option 2-1-1, only one bit may be set to 1 among a plurality of bits indicating RBs occupied by CSI-RS. Option 2-1-2 may be set such that the sum of the number of bits set to 1 among the plurality of bits is equal to M.

For example, '0001' may mean that the CSI-RS pattern is mapped to the first (or last) RB every four RBs. '00010101' may mean that the CSI-RS pattern is mapped to the {i, i+2, i+4}th RB or the {i+3, i+5, i+7}th RB every 8 RBs.

If the start RB position is not indicated/set, a default start position may be applied. The default starting position may be, for example, a configuration in which M consecutive RBs with the lowest (or highest) RB index among N RBs are occupied by CSI-RS.

The bitmap may be included in a table used for CSI-RS resource mapping positions, or may be included in higher layer parameters related to CSI-RS resource mapping.

<<Aspect 2-2>>
Mapping/assignment of CSI-RS resources (eg, different ports/CDM groups) to multiple RBs (or different RBs) if the frequency domain density (eg, frequency domain density) of the CSI-RS resources is less than 1 may be supported.

For example, if the frequency domain density is less than 1, the configuration of CSI-RS locations within a slot (eg, CSI-RS locations within a slot) may be applied across multiple RBs (or different RBs). The configuration of CSI-RS positions within a slot may be, for example, at least one of row #1 to row #18 (or a newly defined/set row) included in the table shown in FIG.

FIG. 8A shows an example of CSI-RS resource mapping patterns (or parameters) corresponding to row #14, and FIG. 8B shows an example of CSI-RS positions in the existing system corresponding to row #14. . Here, the number of ports is 24, the density is 0.5, and the case is cdm4-FD2-TD2. That is, the CSI-RS resource mapping pattern (or row 14) is repeated only once every two RBs. Also, FIG. 8B shows a case where the CSI-RS is mapped to one of two RBs and the CSI-RS is not mapped to the other.

In FIG. 8B, in the frequency domain and time domain of 1 PRB x 1 slot, component resources of 2 subcarriers x 2 symbols are triple-multiplexed (FDM) in the frequency domain and double-multiplexed (TDM) in the time domain. maps 3×2 component resources. Furthermore, CSI-RS in each component resource is multiplied by FD-OCC of length 2 subcarriers and TD-OCC of length 2 symbols, so that 4 CSI-RS are multiplexed (CDM) be done. CSI-RS includes 6 CDM groups, and each CDM group includes 4 ports.

FIG. 8C shows an example of CSI-RS positions corresponding to row #14 when the second aspect is applied. Here, the number of ports is 24, the density is 0.5, and the case is cdm4-FD2-TD2. That is, the CSI-RS resource mapping pattern is repeated only once every two resource blocks (eg, RBs). Also, here the CSI-RS is mapped on both (or across) the two RBs. For example, different ports/CDM groups are mapped to two RBs.

In FIG. 8C, in the frequency domain and time domain of 2 PRBs x 1 slot, component resources of 2 subcarriers x 2 symbols are triple-multiplexed (FDM) in the frequency domain and double-multiplexed (TDM) in the time domain. maps 3×2 component resources. Furthermore, CSI-RS in each component resource is multiplied by FD-OCC of length 2 subcarriers and TD-OCC of length 2 symbols, so that 4 CSI-RS are multiplexed (CDM) be done. CSI-RS includes 6 CDM groups, and each CDM group includes 4 ports. Here, a case is shown where

CDM groups

0, 1, 3 and 4 are mapped to the first RB and

CDM groups

2 and 5 are mapped to the second RB.

Thus, by mapping different ports/different CDM groups corresponding to CSI-RS (eg, CSI-RS location corresponding to a given row) to multiple RBs, CSI-RS mapping flexibility is achieved. Together, it is possible to obtain frequency domain diversity. Also, it is possible to reduce the density of the frequency domain in one slot. Furthermore, by applying it in combination with aspect 2-1, it becomes possible to effectively reduce the density of the frequency domain.

In the case of mapping different ports/different CDM groups to multiple RBs when the frequency domain density is less than 1, the value of kbar/ki in the CSI-RS location configuration (eg, CSI-RS resource mapping table) The range may be extended/changed. In this case, the bitmap length (or size) set/notified by higher layer parameters (eg, FrequencyDomainAllocation) related to frequency domain allocation may be extended. The higher layer parameter (eg frequencyDomainAllocation) may indicate frequency domain resource occupation (eg frequency domain resource occupation) in multiple RBs.

The bitmap length set/notified by the upper layer parameter may be changeable (or variable) based on predetermined conditions (eg, frequency domain density of CSI-RS). For example, if the frequency domain density is 0.5, the bitmap length (or size) may be extended by a factor of two. Also, the range of values of kbar/ki may be expanded (eg, [0,22] (for FD2), [0,23] (for fd-CDM2)).

Also, bitmap length extension may be supported only for a specific CSI-RS location configuration (eg, a specific row), may be supported only for all rows, or may be supported only for a new of rows. A specific row may be, for example, a row other than row #1, row #2, and row #4. A new row may be a row that is introduced for the purpose of mapping different CDM groups/ports to different RBs.

If the bitmap lengths of other rows except row #1, row #2, row #4 are extended, the following relationships may be defined for each row of the table for CSI-RS locations.
Row 1 (row#1): [b3...b0], k _i-1 =f(i)
Row #2: [b11...b0], k _i-1 =f(i)
Row #4: [b2...b0], k _i-1 =4f(i)
Other rows (cases other than row #1/#2/#4): [b11……b0], k _i-1 =2f(i)
f(i) denotes the number of the i-th bit of the bitmap that is set to 1 and is repeated for every two consecutive RBs (eg, if the frequency domain density is 0.5).

Also, higher layer parameters (eg, {evenPRBs, oddPRBs}) for RBs indicated for frequency domain density 0.5 may indicate RBs to which a specific CDM group (eg, CDM group 0) is mapped. good.

FIG. 9A shows an example of a CSI-RS resource mapping pattern corresponding to row #14. The network (eg, base station) may indicate the size-extended bitmap to the UE as a higher layer parameter (eg, frequencyDomainAllocation) for frequency domain allocation of CSI-RS. Here, a case is shown in which "100000001010" is designated as the bitmap corresponding to row #14.

The UE selects a row corresponding to the CSI-RS (here, row #14) based on higher layer parameters including a bitmap notified from the base station, and then determines the frequency domain location of the CSI-RS. . The UE may determine the row based on the port/density/CDM type indicated by the higher layer parameters, or the UE may be notified of information designating the row by the higher layer parameters.

If the density in the frequency domain is 0.5 for row #14, the UE uses [b11...b0], k _i-1 =2f(i) and the bitmap (100000001010) to perform The frequency domain positions of RS (each component resource) are determined to be k0=2, k1=6, and k2=22 (see FIG. 9B).

FIG. 9B shows a case where CSI-RSs (different CDM groups/ports) corresponding to row #14 are mapped in two RBs. The frequency domain positions of CSI-RSs corresponding to

CDM groups

0 and 3 are determined based on k0 (=2), and the frequency domain positions of CSI-RSs corresponding to

CDM groups

1 and 4 are k1 (=6). , and the frequency domain positions of the CSI-RSs corresponding to

CDM groups

2 and 5 are determined based on k2 (=22). Note that the reference point of ki in the frequency direction may be one RB (for example, subcarrier 0 of an RB with a small index) among a plurality of (here, two) RBs.

Although FIG. 9A shows the case of using the rows included in the CSI-RS position table in the existing system, it is not limited to this. New CSI-RS location configurations (eg, new rows) may be supported when mapping different CDM groups/ports to different RBs (see FIG. 10A).

FIG. 10A shows an example of a CSI-RS resource mapping pattern corresponding to the new row#x. Here, the number of ports is 48, the density is 0.5, and the case is cdm4-FD2-TD2. Moreover, the case where the frequency domain is indicated by k0, k1, k2, k3, k4, and k5 is shown.

The network (eg, base station) may indicate to the UE the size-extended bitmap as a higher layer parameter (eg, frequencyDomainAllocation) for frequency domain allocation of CSI-RS. Here, a case is shown in which "101010101010" is specified as the bitmap corresponding to row#x.

The UE selects a row (here, row #x) corresponding to the CSI-RS based on higher layer parameters including a bitmap notified from the base station, and then determines the frequency domain location of the CSI-RS. . The UE may determine the row based on the port/density/CDM type indicated by the higher layer parameters, or the UE may be notified of information designating the row by the higher layer parameters.

For row #x, the UE determines the frequency domain location of CSI-RS (each component resource) based on [b11...b0], k _i-1 =2f(i) and the bitmap (101010101010) , k0=2, k1=6, k2=10, k3=14, k4=18, k5=22 (see FIG. 10B).

FIG. 10B shows an example of CSI-RS positions corresponding to row#x. CSI-RS resources are mapped to both (or across) two RBs. For example, different ports/CDM groups are mapped to two RBs. Here,

CDM groups

0, 1, 2, 6, 7 and 8 are mapped to the first RB and

CDM groups

3, 4, 5, 9, 10 and 11 are mapped to the second RB. ing.

The CSI-RS frequency domain positions corresponding to

CDM groups

0 and 6 are determined based on k0 (=2). Similarly, the frequency domain positions of CSI-RSs corresponding to

CDM groups

1 and 7 are determined based on k1 (=6), and the frequency domain positions of CSI-RSs corresponding to

CDM groups

2 and 8 are k2 ( = 10), the position of the frequency domain of the CSI-RS corresponding to the

CDM groups

3 and 9 is determined based on k3 (= 14), the frequency of the CSI-RS corresponding to the

CDM groups

4 and 10 The position of the domain is determined based on k4 (=18), and the position of the frequency domain of CSI-RSs corresponding to

CDM groups

5 and 11 is determined based on k5 (=22). Note that the reference point of ki in the frequency direction may be one RB (for example, subcarrier 0 of an RB with a small index) among a plurality of (here, two) RBs.

9A and 10A show the case of extending the bitmap length, but without extending the bitmap length, the k bar (eg, ki ) with an offset added (or the range of k bar expanded).

In this case, a new row may be introduced in the table for CSI-RS locations, and the range of kbar/ki in the new row may be defined differently than the existing rows. For example, 0≦k bar≦12/ρ−1 and 0≦ki≦11. The indicated resource mapping allocation (k-bar, l-bar) may be repeated at RBs of 1/ρ. A higher layer parameter for frequency domain allocation (eg, frequencyDomainAllocation) may indicate the resource allocation position of the frequency domain in one RB.

FIG. 11A shows an example of a CSI-RS resource mapping pattern corresponding to the new row#x. Here, the number of ports is 24, the density is 0.5, and the case is cdm4-FD2-TD2. Moreover, the case where the frequency domain is indicated by k0, k1+12, and k2 is shown. That is, an offset (here, +12) is added in the frequency direction to the CDM groups (here, CDM groups 1 and 4) corresponding to k1.

The network (eg, base station) may indicate to the UE a bitmap whose size is not expanded as a higher layer parameter (eg, frequencyDomainAllocation) for frequency domain allocation of CSI-RS. Here, a case is shown in which "101010" is designated as the bitmap corresponding to row#x.

For row #x, the UE determines k0=2, k1=6, k2=10 based on [b5...b0], k _i-1 =2f(i) and bitmap (101010) and determine the frequency domain position of the CSI-RS (each component resource) (see FIG. 11B).

FIG. 11B shows an example of CSI-RS positions corresponding to row#x. CSI-RS resources are mapped to both (or across) two RBs. For example, different ports/CDM groups are mapped to two RBs. Here,

CDM groups

0, 2, 3 and 5 are mapped to the first RB, and

CDM groups

1 and 4 are mapped to the second RB.

The CSI-RS frequency domain positions corresponding to

CDM groups

0 and 3 are determined based on k0 (=2). The frequency domain positions of the CSI-RSs corresponding to

CDM groups

1 and 4 are determined based on k1 (=6)+12. The frequency domain positions of CSI-RSs corresponding to

CDM groups

2 and 5 are determined based on k2 (=10).

Note that the reference point of ki in the frequency direction may be one RB (for example, subcarrier 0 of the RB with the smallest index) among a plurality of (here, two) RBs. Alternatively, the reference point of ki to which a predetermined offset (here, 12) is added may be the other RB (eg, subcarrier 0 of the RB with the higher index).

12 and 13 show another example of mapping different CDM groups to different RBs by extending k bar (or adding an offset to ki).

FIG. 12 shows an example of CSI-RS resource mapping patterns (or parameters) respectively corresponding to row#x and row#y. Here, the number of ports is 48, the density is 0.5, and the case is cdm4-FD2-TD2. In addition, cases where the frequency domain is indicated by k0, k1, k2, k0+12, k1+12, and k2+12 are shown. Here, in row #x and row #y, the values of (k bar, l bar) corresponding to each CDM group are defined differently (or the order is changed).

The network (eg, base station) may indicate to the UE a bitmap whose size is not expanded as a higher layer parameter (eg, frequencyDomainAllocation) for frequency domain allocation of CSI-RS. Here, a case is shown in which "101010" is designated as the bitmap corresponding to row#x/row#y.

UE selects a row corresponding to CSI-RS (here, row #x or row #y) based on higher layer parameters including a bitmap notified from the base station, and then the frequency domain of CSI-RS Determine location. The UE may determine the row based on the port/density/CDM type indicated by the higher layer parameters, or the UE may be notified of information designating the row by the higher layer parameters.

For row#x/row#y, the UE sets k0=2, k1=6, k2 based on [b5...b0], k _i-1 =2f(i) and bitmap (101010) = 10, and determine the frequency domain position of the CSI-RS (each component resource) (see FIG. 13).

FIG. 13 shows an example of CSI-RS positions respectively corresponding to row#x and row#y. CSI-RS resources are mapped to both (or across) two RBs. For example, different ports/CDM groups are mapped to two RBs.

Here, for row #x,

CDM groups

0, 1, 2, 6, 7, 8 are mapped to the first RB and

CDM groups

3, 4, 5, 9, 10, 11 are mapped to the second RB. indicates when The frequency domain positions of CSI-RSs corresponding to

CDM groups

0 and 6 are determined based on k0 (=2), and the frequency domain positions of CSI-RSs corresponding to

CDM groups

1 and 7 are k1 (=6). , and the frequency domain positions of the CSI-RSs corresponding to

CDM groups

2 and 8 are determined based on k2 (=10). The CSI-RS frequency domain positions corresponding to

CDM groups

3 and 9 are determined based on k0 (=2)+12, and the CSI-RS frequency domain positions corresponding to

CDM groups

4 and 10 are k1 (=6 )+12, and the frequency domain positions of the CSI-RSs corresponding to

CDM groups

5 and 11 are determined based on k2(=10)+12.

On the other hand, for row#y,

CDM groups

0, 1, 2, 3, 4, 5 are mapped to the first RB and

CDM groups

6, 7, 8, 9, 10, 11 are mapped to the second RB. indicates when The frequency domain positions of CSI-RSs corresponding to

CDM groups

1 and 4 are k1 (=6). and the frequency domain positions of the CSI-RSs corresponding to

CDM groups

2 and 5 are determined based on k2 (=10). The CSI-RS frequency domain positions corresponding to

CDM groups

6 and 9 are determined based on k0 (=2)+12, and the CSI-RS frequency domain positions corresponding to

CDM groups

7 and 10 are k1 (=6 )+12, and the frequency domain positions of the CSI-RSs corresponding to

CDM groups

8 and 11 are determined based on k2(=10)+12.

In this way, by adding an offset to ki corresponding to each CDM group, when the frequency domain density of CSI-RS is less than 1, it is possible to flexibly control the RB mapping the CDM group. Become.

In the above description, the frequency domain density is 0.5 as a case where the frequency domain density is less than 1, but the applicable frequency domain density is not limited to 0.5. Aspect 2-2 may be applied to frequency domain densities other than 0.5 (for example, aspect 2-1 and aspect 2-2 may be applied in combination).

FIG. 14A shows an example of a CSI-RS resource mapping pattern corresponding to row #14. Here, the case where 1/4 (N=4) as frequency domain density is supported is shown.

The network (eg, base station) may indicate to the UE the size-extended bitmap as a higher layer parameter (eg, frequencyDomainAllocation) for frequency domain allocation of CSI-RS.

The bitmap length set/notified by the upper layer parameter may be changeable (or variable) based on a predetermined condition (eg frequency domain density of CSI-RS). For example, for density ρ_new=1/N or ρ_new=M/N, the bitmap length (or size) signaled in higher layer parameters (eg frequencyDomainAllocation) may be extended by N times. Also, the range of values of k bar/ki may be extended (eg, [0, N×12−2]).

Also, bitmap length extension may be supported only for a specific CSI-RS location configuration (eg, a specific row), may be supported only for all rows, or may be supported only for a new of rows. A specific row may be, for example, a row other than row #1, row #2, and row #4.

If the bitmap length is extended, the following relationships may be defined for a given row of the table for CSI-RS locations.
[b6*N-1,b6*N-2……b0],k _i-1 =2f(i)
f(i) denotes the number of the i-th bit of the bitmap set to 1 and is repeated for every N consecutive RBs.

The occupied RB position (eg, occupied RB position(s)) indicated/defined in aspect 2-1 may indicate the RB position of a specific CDM group index (eg, CDM group index 0). The occupied RB position may be indicated by higher layer signaling or may be defined in use for each row.

Here, a case is shown where "000000, 100000, 001000, 000010" is indicated as the bitmap corresponding to row #x.

For row #14, the UE matches [b6*N-1,b6*N-2...b0], k _i-1 =2f(i) with the bitmap (000000, 100000, 001000, 000010) Based on this, the frequency domain positions of CSI-RS (each component resource) are determined to be k0=2, k1=18, and k2=32 (see FIG. 14B).

FIG. 14B shows an example of CSI-RS positions corresponding to row #14. CSI-RS resources may be mapped across 4 RBs (here mapped to 3 RBs). For example, different ports/CDM groups are allowed to be mapped to 4 RBs. Here,

CDM groups

0, 3 are mapped to the first RB,

CDM groups

1, 4 are mapped to the second RB,

CDM groups

2, 5 are mapped to the third RB, and

CDM groups

2, 5 are mapped to the fourth RB. indicates the case where no CSI group is mapped.

The CSI-RS frequency domain positions corresponding to

CDM groups

0 and 3 are determined based on k0 (=2). Similarly, the CSI-RS frequency domain positions corresponding to

CDM groups

1 and 4 are determined based on k1 (=18), and the CSI-RS frequency domain positions corresponding to

CDM groups

2 and 5 are k2 ( = 32). Note that the reference point of ki in the frequency direction may be a specific RB (for example, subcarrier 0 of the RB with the smallest index) among a plurality of (here, four) RBs.

FIG. 14A shows the case of extending the bitmap length, but without extending the bitmap length, offset to k bars (eg, ki) defined/set in the CSI-RS location configuration (eg, row). (or the range of k bar is expanded) (see FIG. 15A).

FIG. 15A shows an example of a CSI-RS resource mapping pattern corresponding to the new row#x. Here, the number of ports is 24, the density is 1/4, and the case is cdm4-FD2-TD2. Moreover, the cases where the frequency domain is indicated by k0, k1+12, and k2+24 are shown. That is, the CDM group corresponding to k1 (here, CDM groups 1 and 4) and the CDM group corresponding to k2 (here, CDM groups 2 and 5) are offset in the frequency direction.

The offset may be a multiple of a predetermined value (eg, 12). The offset value may be determined based on predetermined parameters. For example, the offset value may be determined based on at least one of CDM type, number of ports, frequency domain density, and RRC configured parameters.

The network (eg, base station) may indicate to the UE a bitmap whose size is not expanded as a higher layer parameter (eg, frequencyDomainAllocation) for frequency domain allocation of CSI-RS. For example, add a table of CSI-RS locations within a slot that includes more than 12 frequency offsets as shown above with a predetermined rule, and decide whether to use the existing table or the added table based on the upper layer parameters. You can decide. Alternatively, new rows may be added to existing columns to determine which rows to reference based on upper layer parameters. Here, a case is shown in which "101010" is designated as the bitmap corresponding to row#x.

For row #x, the UE determines k0=2, k1=6, k2=10 based on [b5...b0], k _i-1 =2f(i) and bitmap (101010) and determine the frequency domain position of the CSI-RS (each component resource) (see FIG. 15B).

FIG. 15B shows an example of CSI-RS positions corresponding to row#x. CSI-RS resources may be mapped across 4 RBs (here mapped to 3 RBs). For example, different ports/CDM groups are allowed to be mapped to 4 RBs. Here,

CDM groups

0, 3 are mapped to the first RB,

CDM groups

1, 4 are mapped to the second RB,

CDM groups

2, 5 are mapped to the third RB, and

CDM groups

The CSI-RS frequency domain positions corresponding to

CDM groups

1 and 4 are determined based on k1 (=6)+12. The frequency domain positions of the CSI-RSs corresponding to

CDM groups

2 and 5 are determined based on k2 (=10)+24.

Note that the reference point of ki in the frequency direction may be one RB (for example, subcarrier 0 of the RB with the smallest index) among a plurality of (here, four) RBs.

In the above description, the offset (eg, 12/24) is based on the subcarrier, but it is not limited to this. For example, the offset unit may be RB in the present disclosure. For example, the offset added to k1 may be 1 (RB) and the offset added to k2 may be 2 (RB).

Thus, by applying aspects 2-1 and 2-2 in combination, the mapping of CSI-RS resources in the frequency domain is flexibly controlled, and the overhead of CSI-RS resources mapped to the frequency domain is reduced. can do.

<<Aspect 2-3>>
Setting/applying different frequency domain resource allocations for different starting symbols may be supported if multiple (eg, two) starting symbols are configured in one slot.

Note that aspect 2-3 is a configuration of CSI-RS positions in which multiple start symbols are set in one slot (for example, rows #11, #13, #14, #17 of a table relating to CSI-RS positions, or new row).

If multiple starting symbols are configured within one slot, it may be supported to configure the frequency domain resource allocation of the CSI-RS resources separately (eg, differently) for each starting symbol.

FIG. 16A shows a case where multiple start symbols are set in one slot, and CSI-RS frequency domain resource allocation is commonly set for multiple start symbols (eg, l0, l1). ing. In FIG. 16A, the frequency domain resource allocations of CDM groups 0-2 mapped to the first start symbol and the frequency domain resource allocations of CDM groups 3-5 mapped to the second start symbol are the same. set. Specifically, CDM group 0 mapped to the first start symbol and CDM group 3 mapped to the second start symbol are assigned to common frequency domain resources.

On the other hand, FIG. 16B shows a case where the frequency domain resource allocation of CSI-RS is set separately (eg, differently) for each start symbol when multiple start symbols are set in one slot. there is For example, in FIG. 16B, the frequency-domain resource allocations for CDM groups 0-2 mapped to the first starting symbol and the frequency-domain resource allocations for CDM groups 3-5 mapped to the second starting symbol are set separately. Specifically, CDM group 0 mapped to the first start symbol and CDM group 3 mapped to the second start symbol are assigned to different frequency domain resources.

In this way, by separately performing frequency domain resource allocation for different start symbols, it is possible to flexibly control subcarrier allocation for different ports. In addition to the number of ports supported in existing systems (eg, 1/2/4/8/12/16/24/32 ports), other port numbers/port numbers (eg, 20 ports/28 ports) ) can be supported. This makes it possible to set the number of CDM groups corresponding to the first start symbol and the number of CDM groups corresponding to the second start symbol differently.

Bitmaps corresponding to multiple (eg, two) frequency domains may be set/indicated/applied to multiple (eg, two) start symbols in one slot. Bitmaps corresponding to multiple frequency domains may be set by higher layer parameters (see FIG. 17).

FIG. 17 shows an example of higher layer parameters (for example, CSI-RS-ResourceMapping) related to CSI-RS resource mapping. The network (eg, base station) may use higher layer parameters for CSI-RS resource mapping to inform the UE of two frequency domain bitmaps (eg, frequencyDomainAllocation and frequencyDomainAllocation2).

The UE may apply multiple (eg, two) signaled frequency-domain bitmaps to different starting symbols. Note that FIG. 17 shows a case where the size (or bitmap length) of the second bitmap is 6, but this is not restrictive and other values may be supported.

The second bitmap (eg frequencyDomainAllocation2) may be an additional bitmap that is added in addition to the first bitmap (eg frequencyDomainAllocation). The second bitmap (eg frequencyDomainAllocation2) may only be present if a specific CSI-RS location configuration (eg row) is set/indicated. A specific row may be a row (for example, row #13/#14/#16/#17) in which a plurality of start symbols are set within one slot. If the second bitmap is not included when a specific row is set, the UE applies the same rule as the CSI-RS resource mapping pattern of the existing system (Rel.15/16) good.

FIG. 18A shows an example of a CSI-RS resource mapping pattern corresponding to row #14. Here, the numbers of ports are 24, 20 and 28, the densities are 1 and 0.5, and cdm4-FD2-TD2 are shown. It also shows the case where the frequency domains corresponding to the first start symbol (eg, l0) and the second start symbol (eg, l1) are denoted by k0, k1, and k2. Note that the number of ports to be set may be specified by higher layer signaling.

The network (eg, base station) uses a first frequency domain resource allocation (eg, frequencyDomainAllocation/first bitmap) and a second frequency domain resource allocation ( For example, frequencyDomainAllocation2/second bitmap) may be notified to the UE.

The UE determines the frequency of the CSI-RS (each component resource) in each starting symbol based on [b5...b0], k _i-1 =2f(i) and the first bitmap and the second bitmap. Determine the position of the domain (k0, k1, k2) (see Figures 18B-D). FIG. 18B corresponds to CSI-RS resources with 24 ports, FIG. 18C corresponds to CSI-RS resources with 20 ports, and FIG. 18D corresponds to CSI-RS resources with 28 ports. ing.

FIG. 18B shows a case where "101010" is notified as the first bitmap and "010101" is notified as the second bitmap when the number of ports is 24 (six CDM groups). . In this case, the UE determines that the frequency domain location of the CSI-RS (each component resource) in the first start symbol is k0=2, k1=6, k2=10. On the other hand, the UE determines that the frequency domain location of the CSI-RS (each component resource) in the second start symbol is k0=0, k1=4, k2=8.

FIG. 18C shows a case where "101010" is notified as the first bitmap and "000101" is notified as the second bitmap when the number of ports is 20 (five CDM groups). . In this case, the UE determines that the frequency domain location of the CSI-RS (each component resource) in the first start symbol is k0=2, k1=6, k2=10. On the other hand, the UE determines that the frequency domain location of the CSI-RS (each component resource) in the second starting symbol is k0=0, k1=4.

FIG. 18D shows a case where "101010" is notified as the first bitmap and "101101" is notified as the second bitmap when the number of ports is 28 (seven CDM groups). . In this case, the UE determines that the frequency domain location of the CSI-RS (each component resource) in the first start symbol is k0=2, k1=6, k2=10. On the other hand, the UE determines that the frequency domain location of the CSI-RS (each component resource) in the second start symbol is k0=0, k1=4, k2=6, k3=10.

Although FIGS. 18A to 18D show the case of notifying the UE of multiple bitmaps, the present invention is not limited to this. The second bitmap (eg, frequencyDomainAllocation2) may not be signaled and the k bars (eg, ki) corresponding to different start symbols may be separately defined/configured.

In this case, a new row may be introduced in the table for CSI-RS locations, and the definition of k bar/ki in the new row may be defined differently from the existing rows. For example, a configuration of ki corresponding to the first starting symbol plus a predetermined offset may be applied to the second starting symbol. A modulo operation may be applied to the predetermined offset, for example.

FIG. 19A shows an example of a CSI-RS resource mapping pattern corresponding to the new row#x. Here, the case is shown where the number of ports is 24, the density is 1, 0.5, and cdm4-FD2-TD2. Also, the frequency domain corresponding to the first start symbol is defined by k0, k1, k2, and the frequency domain corresponding to the second start symbol is defined by (k0+2) mod2, (k1+2) mod2, (k2+2) mod2. It shows the case where

The network (eg, base station) may indicate the bitmap to the UE as a higher layer parameter (eg, frequencyDomainAllocation) for frequency domain allocation of CSI-RS. Here, a case is shown in which "101010" is designated as the bitmap corresponding to row#x.

For row #x, the UE determines k0=2, k1=6, k2=10 based on [b5...b0], k _i-1 =2f(i) and bitmap (101010) and determine the position of the frequency domain resource of the CSI-RS (each component resource) (see FIG. 19B). Here, the positions of the frequency domain resources corresponding to the first start symbol (the frequency domain resources corresponding to

CDM groups

0, 1, and 2, respectively) are k0=2, k1=6, and k2=10, and the second The positions of the frequency domain resources corresponding to the start symbol (frequency domain resources corresponding to

CDM groups

3, 4, and 5, respectively) are (k0+2) mod12=4, (k1+2) mod12=8, and (k2+2) mod12=0.

Aspect 2-3 may be applied in combination with at least one of Aspects 2-1 and 2-2.

<<Aspect 2-2 + Aspect 2-3>>
If the frequency domain density value of the CSI-RS resource is less than 1 and multiple (eg, two) start symbols are configured in one slot, different ports for multiple RBs (or different RBs) /CDM group mapping may be supported, and different frequency domain resource allocations for different starting symbols may be supported.

FIG. 20A shows an example of a CSI-RS resource mapping pattern corresponding to row #14. Here, the case is shown where the number of ports is 24, the density is 1, 0.5, and cdm4-FD2-TD2. It also shows the case where the frequency domains corresponding to the first start symbol (eg, l0) and the second start symbol (eg, l1) are denoted by k0, k1, and k2. Note that the frequency domain density and the like to be set may be specified by higher layer signaling.

If the frequency-domain density is 0.5, the UE, based on [b11...b0], k _i-1 =2f(i) and the first bitmap and the second bitmap, Determine the frequency domain location (k0, k1, k2) of the CSI-RS (each component resource) (see FIG. 20B).

FIG. 20B shows a case where "000000101010" is notified as the first bitmap and "010101000000" is notified as the second bitmap when the number of ports is 24 (six CDM groups). . In this case, the UE determines that the frequency domain location of the CSI-RS (each component resource) in the first start symbol is k0=2, k1=6, k2=10. On the other hand, the UE determines that the frequency domain location of the CSI-RS (each component resource) in the second starting symbol is k0=12, k1=16, k2=20.

Here,

CDM groups

0, 1, 2 corresponding to the first starting symbol are mapped to the first RB, and

CDM groups

3, 4, 5 corresponding to the second starting symbol are mapped to the second RB. It shows the case where

Thus, for different starting symbols, bitmap indications of different frequency domain allocations are supported, and if the frequency domain density is less than 1, multiple ports with different allocations of frequency domain resources can be assigned to different RBs. Mapping is possible.

Although FIGS. 20A and 20B show the case of notifying the UE of multiple bitmaps, the present invention is not limited to this. The second bitmap (eg, frequencyDomainAllocation2) may not be signaled and the k bars (eg, ki) corresponding to different start symbols may be separately defined/configured.

<<Aspect 2-1 + Aspect 2-2 + Aspect 2-3>>
A new frequency domain density (eg, ρ_new = 1/N or M / N) different from the existing system is applied as the value of the frequency domain density of the CSI-RS resource, and multiple (eg, two) starts within one slot If the symbols are configured, different port/CDM group mappings for multiple RBs (or different RBs) may be supported, and different frequency domain resource allocations for different starting symbols may be supported.

FIG. 21A shows an example of a CSI-RS resource mapping pattern corresponding to row #14. Here, the case is shown where the number of ports is 24, the density is 1, 0.5, 1/4, and cdm4-FD2-TD2. It also shows the case where the frequency domains corresponding to the first start symbol (eg, l0) and the second start symbol (eg, l1) are denoted by k0, k1, and k2. Note that the frequency domain density and the like to be set may be specified by higher layer signaling.

If the frequency domain density is 1/4, the UE has [b6*N-1,b6*N-2...b0], k _i-1 =2f(i) and the first bitmap and the second bit map, determine the frequency domain location (k0, k1, k2) of the CSI-RS (each component resource) in each starting symbol (see FIG. 21B).

In FIG. 21B, when the number of ports is 24 (6 CDM groups), "000000, 100000, 001000, 000010" is notified as the first bitmap, and "100000, 000001, 000000" is notified as the second bitmap. , 100000'' are notified. In this case, the UE determines that the frequency domain location of the CSI-RS (each component resource) in the first start symbol is k0=2, k1=18, k2=34. On the other hand, the UE determines that the frequency domain location of the CSI-RS (each component resource) in the second starting symbol is k0=10, k1=24, k2=46.

Here,

CDM groups

0, 1 and 2 corresponding to the first starting symbol are mapped to different RBs, and

CDM groups

3, 4 and 5 corresponding to the second starting symbol are mapped to different RBs. Furthermore, the frequency domain resources of

CDM groups

0, 1 and 2 corresponding to the first starting symbol and the frequency domain resources of

CDM groups

3, 4 and 5 corresponding to the second starting symbol are configured separately. .

Thus, for different starting symbols (or for each starting symbol), different frequency domain resource allocations are supported, if the frequency domain density is less than 1 (eg ρ_new=1/N or M/N). , it is possible to map multiple ports with different allocations of frequency domain resources to different RBs.

Although FIGS. 21A and 21B show the case of notifying the UE of multiple bitmaps, the present invention is not limited to this. The second bitmap (eg, frequencyDomainAllocation2) may not be signaled and the k bars (eg, ki) corresponding to different start symbols may be separately defined/configured.

Which of aspects 2-1 to 2-3 is applied may be set in the UE by a higher layer parameter, may be reported by the UE as UE capability information, or may be defined by the specification. good too. Alternatively, which of aspects 2-1 to 2-3 is applied may be determined in consideration of UE capability information reported from the UE and higher layer parameters set in the UE. .

(UE capability information)
In the above first embodiment to second embodiment, the following UE capabilities may be set. Note that the UE capabilities below may be read as parameters (eg, higher layer parameters) set in the UE from the network (eg, base station).

The operation of each embodiment may be applied only when the corresponding UE capabilities are reported.

UE capability information may be defined as to whether to support a value greater than a predetermined value for the time domain periodicity of CSI-RS.

UE capability information regarding whether to support a predetermined value (eg, a new value not supported by existing systems) for the frequency domain density of CSI-RS may be defined.

UE capability information may be defined as to whether the UE supports mapping different ports/CDM groups to different RBs.

The above first and second embodiments may be configured to be applied to a UE that supports/reports at least one of the UE capabilities described above. Alternatively, the above embodiment may be configured to be applied to a UE set by a network.

(wireless communication system)
A configuration of a wireless communication system according to an embodiment of the present disclosure will be described below. In this radio communication system, communication is performed using any one of the radio communication methods according to the above embodiments of the present disclosure or a combination thereof.

FIG. 22 is a diagram showing an example of a schematic configuration of a wireless communication system according to one embodiment. The wireless communication system 1 may be a system that realizes communication using Long Term Evolution (LTE), 5th generation mobile communication system New Radio (5G NR), etc. specified by the Third Generation Partnership Project (3GPP). .

The wireless communication system 1 may also support dual connectivity between multiple Radio Access Technologies (RATs) (Multi-RAT Dual Connectivity (MR-DC)). MR-DC is dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity between NR and LTE (NR-E -UTRA Dual Connectivity (NE-DC)), etc. may be included.

In EN-DC, the LTE (E-UTRA) base station (eNB) is the master node (MN), and the NR base station (gNB) is the secondary node (SN). In NE-DC, the NR base station (gNB) is the MN, and the LTE (E-UTRA) base station (eNB) is the SN.

The wireless communication system 1 has dual connectivity between multiple base stations within the same RAT (for example, dual connectivity (NR-NR Dual Connectivity (NN-DC) in which both MN and SN are NR base stations (gNB) )) may be supported.

A wireless communication system 1 includes a base station 11 forming a macrocell C1 with a relatively wide coverage, and base stations 12 (12a-12c) arranged in the macrocell C1 and forming a small cell C2 narrower than the macrocell C1. You may prepare. A user terminal 20 may be located within at least one cell. The arrangement, number, etc. of each cell and user terminals 20 are not limited to the embodiment shown in the figure. Hereinafter, the

base stations

11 and 12 are collectively referred to as the base station 10 when not distinguished.

The user terminal 20 may connect to at least one of the multiple base stations 10 . The user terminal 20 may utilize at least one of carrier aggregation (CA) using a plurality of component carriers (CC) and dual connectivity (DC).

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 (FR2)). Macrocell C1 may be included in FR1, and small cell C2 may be included in FR2. For example, FR1 may be a frequency band below 6 GHz (sub-6 GHz), and FR2 may be a frequency band above 24 GHz (above-24 GHz). Note that the frequency bands and definitions of FR1 and FR2 are not limited to these, and for example, FR1 may correspond to a higher frequency band than FR2.

Also, the user terminal 20 may communicate using at least one of Time Division Duplex (TDD) and Frequency Division Duplex (FDD) in each CC.

A plurality of base stations 10 may be connected by wire (for example, an optical fiber conforming to Common Public Radio Interface (CPRI), X2 interface, etc.) or wirelessly (for example, NR communication). For example, when NR communication is used as a backhaul between the

base stations

11 and 12, the base station 11 corresponding to the upper station is an Integrated Access Backhaul (IAB) donor, and the base station 12 corresponding to the relay station (relay) is an IAB Also called a node.

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

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

In the radio communication system 1, a radio access scheme based on orthogonal frequency division multiplexing (OFDM) may be used. For example, in at least one of Downlink (DL) and Uplink (UL), Cyclic Prefix OFDM (CP-OFDM), Discrete Fourier Transform Spread OFDM (DFT-s-OFDM), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier Frequency Division Multiple Access (SC-FDMA), etc. may be used.

A radio access method may be called a waveform. Note that 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 used as the UL and DL radio access schemes.

In the radio 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)) or the like may be used.

In the radio communication system 1, as uplink channels, an uplink shared channel (PUSCH) shared by each user terminal 20, an uplink control channel (PUCCH), a random access channel (Physical Random Access Channel (PRACH)) or the like may be used.

User data, upper layer control information, System Information Block (SIB), etc. are transmitted by the PDSCH. User data, higher layer control information, and the like may be transmitted by PUSCH. Also, a Master Information Block (MIB) may be transmitted by the PBCH.

Lower layer control information may be transmitted by the PDCCH. The lower layer control information may include, for example, downlink control information (DCI) including scheduling information for at least one of PDSCH and PUSCH.

The DCI that schedules PDSCH may be called DL assignment, DL DCI, etc., and the DCI that schedules PUSCH may be called UL grant, UL DCI, etc. PDSCH may be replaced with DL data, and PUSCH may be replaced with UL data.

A control resource set (CControl Resource SET (CORESET)) and a search space (search space) may be used for PDCCH detection. CORESET corresponds to a resource searching for DCI. The search space corresponds to the search area and search method of PDCCH candidates. A CORESET may be associated with one or more search spaces. The UE may monitor CORESETs associated with certain search spaces based on the search space settings.

One search space may correspond to PDCCH candidates corresponding to one or more aggregation levels. One or more search spaces may be referred to as a search space set. Note that "search space", "search space set", "search space setting", "search space set setting", "CORESET", "CORESET setting", etc. in the present disclosure may be read interchangeably.

By PUCCH, channel state information (CSI), acknowledgment information (for example, Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK/NACK, etc.) and scheduling request (Scheduling Request ( SR)) may be transmitted. A random access preamble for connection establishment with a cell may be transmitted by the PRACH.

In addition, in the present disclosure, downlink, uplink, etc. may be expressed without adding "link". Also, various channels may be expressed without adding "Physical" to the head.

In the wireless communication system 1, synchronization signals (SS), downlink reference signals (DL-RS), etc. may be transmitted. In the radio communication system 1, the DL-RS includes a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS), a demodulation reference signal (DeModulation Reference Signal (DMRS)), Positioning Reference Signal (PRS)), Phase Tracking Reference Signal (PTRS)), etc. may be transmitted.

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 be called SS/PBCH block, SS Block (SSB), and so on. Note that SS, SSB, etc. may also be referred to as reference signals.

Also, in the radio communication system 1, even if measurement reference signals (SRS), demodulation reference signals (DMRS), etc. are transmitted as uplink reference signals (UL-RS), good. Note that DMRS may also be called a user terminal-specific reference signal (UE-specific reference signal).

(base station)
FIG. 23 is a diagram illustrating an example of the configuration of a base station according to one embodiment. The base station 10 comprises a control section 110 , a transmission/reception section 120 , a transmission/reception antenna 130 and a transmission line interface 140 . One or more of each of the control unit 110, the transmitting/receiving unit 120, the transmitting/receiving antenna 130, and the transmission path interface 140 may be provided.

It should be noted that this example mainly shows the functional blocks of the features of the present embodiment, and it may be assumed that the base station 10 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 110 controls the base station 10 as a whole. The control unit 110 can be configured from a controller, a control circuit, and the like, which are explained based on common recognition in the technical field according to the present disclosure.

The control unit 110 may control signal generation, scheduling (for example, resource allocation, mapping), and the like. The control unit 110 may control transmission/reception, measurement, etc. using the transmission/reception unit 120 , the transmission/reception antenna 130 and the transmission line interface 140 . The control unit 110 may generate data to be transmitted as a signal, control information, a sequence, etc., and transfer them to the transmission/reception unit 120 . The control unit 110 may perform call processing (setup, release, etc.) of communication channels, state management of the base station 10, management of radio resources, and the like.

The transmitting/receiving section 120 may include a baseband section 121 , a radio frequency (RF) section 122 and a measuring section 123 . The baseband section 121 may include a transmission processing section 1211 and a reception processing section 1212 . The transmitting/receiving unit 120 is configured from a transmitter/receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmitting/receiving circuit, etc., which are explained based on common recognition in the technical field according to the present disclosure. be able to.

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

The transmitting/receiving antenna 130 can be configured from an antenna described based on common recognition in the technical field related to the present disclosure, such as an array antenna.

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

The transmitting/receiving unit 120 may form at least one of the transmission beam and the reception beam using digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), or the like.

The transmission/reception unit 120 (transmission processing unit 1211) performs 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. may be performed to generate a bit string to be transmitted.

The transmission/reception unit 120 (transmission processing unit 1211) performs channel coding (which may include error correction coding), modulation, mapping, filtering, and discrete Fourier transform (DFT) on the bit string to be transmitted. Processing (if necessary), Inverse Fast Fourier Transform (IFFT) processing, precoding, transmission processing such as digital-to-analog conversion may be performed, and the baseband signal may be output.

The transmitting/receiving unit 120 (RF unit 122) may perform modulation to a radio frequency band, filter processing, amplification, and the like on the baseband signal, and may transmit the radio frequency band signal via the transmitting/receiving antenna 130. .

On the other hand, the transmitting/receiving unit 120 (RF unit 122) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transmitting/receiving antenna 130.

The transmission/reception unit 120 (reception processing unit 1212) performs analog-to-digital conversion, Fast Fourier transform (FFT) processing, and Inverse Discrete Fourier transform (IDFT) processing on the acquired baseband signal. )) processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing and PDCP layer processing. User data and the like may be acquired.

The transmitting/receiving unit 120 (measuring unit 123) may measure the received signal. For example, the measurement unit 123 may perform Radio Resource Management (RRM) measurement, Channel State Information (CSI) measurement, etc. based on the received signal. The measurement unit 123 measures received power (for example, Reference Signal Received Power (RSRP)), reception quality (for example, Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR)) , signal strength (for example, Received Signal Strength Indicator (RSSI)), channel information (for example, CSI), and the like may be measured. The measurement result may be output to control section 110 .

The transmission path interface 140 transmits and receives signals (backhaul signaling) to and from devices included in the core network 30, other base stations 10, etc., and user data (user plane data) for the user terminal 20, control plane data, and the like. Data and the like may be obtained, transmitted, and the like.

The transmitting unit and 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 line interface 140.

Transmitting/receiving section 120 provides information on time-domain resources indicated in units of time longer than a slot and information on frequency-domain resources supporting at least a frequency-domain density of less than 0.5 with respect to the channel state information reference signal. You may send at least one. The control unit 110 may control mapping of channel state information reference signals corresponding to at least one of information on time domain resources and information on frequency domain resources.

Alternatively, the transmitting/receiving section 120 may transmit information about the frequency domain density of the channel state information reference signal. The control unit 110 may control transmission of channel state information reference signals in which mapping of at least one of different ports and different CDM groups to multiple resource blocks is supported when the frequency domain density is less than one.

Alternatively, the transmitting/receiving section 120 may transmit information about the start symbol of the channel state information reference signal. When multiple start symbols are included in a slot, control section 110 may control transmission of channel state information reference signals in which frequency domain resources are configured separately for each start symbol.

(user terminal)
FIG. 24 is a diagram illustrating an example of the configuration of a user terminal according to an embodiment; The user terminal 20 includes a control section 210 , a transmission/reception section 220 and a transmission/reception antenna 230 . One or more of each of the control unit 210, the transmitting/receiving unit 220, and the transmitting/receiving antenna 230 may be provided.

It should be noted that this example mainly shows the functional blocks of the features of the present embodiment, and it may be assumed 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 controls the user terminal 20 as a whole. The control unit 210 can be configured from a controller, a control circuit, and the like, which are explained based on common recognition in the technical field according to the present disclosure.

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

The transmitting/receiving section 220 may include a baseband section 221 , an RF section 222 and a measurement section 223 . The baseband section 221 may include a transmission processing section 2211 and a reception processing section 2212 . The transmitting/receiving unit 220 can be configured from a transmitter/receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measuring circuit, a transmitting/receiving circuit, etc., which are explained based on common recognition in the technical field according to the present disclosure.

The transmission/reception unit 220 may be configured as an integrated transmission/reception unit, or may be configured from a transmission unit and a reception unit. The transmission section may be composed of a transmission processing section 2211 and an RF section 222 . The receiving section may include a reception processing section 2212 , an RF section 222 and a measurement section 223 .

The transmitting/receiving antenna 230 can be configured from an antenna described based on common recognition in the technical field related to the present disclosure, such as an array antenna.

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

The transmitter/receiver 220 may form at least one of the transmission beam and the reception beam using digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), or the like.

The transmitting/receiving unit 220 (transmission processing unit 2211) performs PDCP layer processing, RLC layer processing (eg, RLC retransmission control), MAC layer processing (eg, , HARQ retransmission control) and the like may be performed to generate a bit string to be transmitted.

The transmission/reception unit 220 (transmission processing unit 2211) performs channel coding (which may include error correction coding), modulation, mapping, filtering, DFT processing (if necessary), and IFFT processing on a bit string to be transmitted. , precoding, digital-analog conversion, and other transmission processing may be performed, and the baseband signal may be output.

Whether or not to apply DFT processing may be based on transform precoding settings. Transmitting/receiving unit 220 (transmission processing unit 2211), for a certain channel (for example, PUSCH), if transform precoding is enabled, the above to transmit the channel using the DFT-s-OFDM waveform The DFT process may be performed as the transmission process, or otherwise the DFT process may not be performed as the transmission process.

The transmitting/receiving unit 220 (RF unit 222) may perform modulation to a radio frequency band, filter processing, amplification, and the like on the baseband signal, and may transmit the radio frequency band signal via the transmitting/receiving antenna 230. .

On the other hand, the transmitting/receiving section 220 (RF section 222) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transmitting/receiving antenna 230.

The transmission/reception unit 220 (reception processing unit 2212) performs analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering, demapping, demodulation, decoding (error correction) on the acquired baseband signal. decoding), MAC layer processing, RLC layer processing, PDCP layer processing, and other reception processing may be applied to acquire user data and the like.

The transmitting/receiving section 220 (measuring section 223) may measure the received signal. For example, the measurement unit 223 may perform RRM measurement, CSI measurement, etc. based on the received signal. The measuring unit 223 may measure received power (eg, RSRP), received quality (eg, RSRQ, SINR, SNR), signal strength (eg, RSSI), channel information (eg, CSI), and the like. The measurement result may be output to control section 210 .

Note that the transmitter and receiver of the user terminal 20 in the present disclosure may be configured by at least one of the transmitter/receiver 220 and the transmitter/receiver antenna 230 .

The transmitting/receiving unit 220 provides information on time-domain resources indicated in units of time longer than a slot and information on frequency-domain resources supporting at least a frequency-domain density of less than 0.5 with respect to the channel state information reference signal. At least one may be received. The control unit 210 may control reception of the channel state information reference signal based on at least one of information on time domain resources and information on frequency domain resources (aspects of the first embodiment/second embodiment 2-1).

Information about time-domain resources may include information about offsets indicated in time units longer than slots. Information about frequency domain resources may include information about one or more resource blocks to which the channel state information reference signal is allocated in a plurality of resource blocks. Information about one or more resource blocks to which channel state information reference signals are assigned may be indicated in bitmap form.

Alternatively, the transmitting/receiving unit 220 may receive information about the frequency domain density of the channel state information reference signal. The control unit 210 may control the reception of channel state information reference signals supporting at least one mapping of different ports and different CDM groups to multiple resource blocks when the frequency domain density is less than 1 ( Aspect 2-2) of the second embodiment.

The transmitting/receiving unit 220 may receive frequency domain allocation information of channel state reference signals including bitmaps indicating subcarriers in multiple resource blocks. The bitmap size may vary depending on the frequency domain density. The transmitting/receiving unit 220 receives the frequency domain allocation information of the channel state reference signal, and the control unit 210 controls the reception of the channel state information reference signal by applying a predetermined offset to the frequency domain allocation information of the channel state reference signal. may

Alternatively, the transmitting/receiving unit 220 may receive information about the start symbol of the channel state information reference signal. When multiple start symbols are included in a slot, the control unit 210 may control reception of channel state information reference signals in which frequency domain resources are configured separately for each start symbol (aspect of the second embodiment 2-3).

The transmitting/receiving unit 220 may receive multiple bitmaps indicating the frequency domain allocation of channel state information corresponding to each starting symbol. If a slot includes a first start symbol and a second start symbol, the frequency domain position of the channel state reference signal corresponding to the second start symbol is the channel state reference corresponding to the first start symbol. A predetermined offset may be applied to the frequency domain location of the signal. The number of CDM groups mapped to each starting symbol may be set differently.

(Hardware configuration)
It should be noted that the block diagrams used in the description of the above embodiments show blocks in units of functions. These functional blocks (components) are implemented by any combination of at least one of hardware and software. Also, the method of realizing each functional block is not particularly limited. That is, each functional block may be implemented using one device physically or logically coupled, or directly or indirectly using two or more physically or logically separated devices (e.g. , wired, wireless, etc.) and may be implemented using these multiple devices. A functional block may be implemented by combining software in the one device or the plurality of devices.

where function includes judgment, decision, determination, calculation, calculation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, deem , broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc. Not limited. For example, a functional block (component) that performs transmission may be called a transmitting unit, a transmitter, or the like. In either case, as described above, the implementation method is not particularly limited.

For example, a base station, a user terminal, etc. in an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. FIG. 25 is a diagram illustrating an example of hardware configurations of a base station and a user terminal according to an embodiment. The base station 10 and user terminal 20 described above 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 the present disclosure, terms such as apparatus, circuit, device, section, and unit can be read interchangeably. The hardware configuration of the base station 10 and the user terminal 20 may be configured to include one or more of each device shown in the figure, or may be configured without some devices.

For example, although only one processor 1001 is illustrated, there may be multiple processors. Also, processing may be performed by one processor, or processing may be performed by two or more processors concurrently, serially, or otherwise. Note that processor 1001 may be implemented by one or more chips.

Each function in the base station 10 and the user terminal 20, for example, by loading predetermined software (program) on hardware such as a processor 1001 and a memory 1002, the processor 1001 performs calculations, communication via the communication device 1004 and at least one of reading and writing data in the memory 1002 and the storage 1003 .

The processor 1001, for example, operates an operating system and controls the entire computer. The processor 1001 may be configured by a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, registers, and the like. For example, at least part of the above-described control unit 110 (210), transmission/reception unit 120 (220), etc. may be realized by the processor 1001. FIG.

Also, the processor 1001 reads programs (program codes), software modules, data, etc. 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 part of the operations described in the above embodiments is used. For example, the control unit 110 (210) may be implemented by a control program stored in the memory 1002 and running on the processor 1001, and other functional blocks may be similarly implemented.

The memory 1002 is a computer-readable recording medium, such as Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically EPROM (EEPROM), Random Access Memory (RAM), or at least any other suitable storage medium. may be configured by one. The memory 1002 may also be called a register, cache, main memory (main storage device), or the like. The memory 1002 can store executable programs (program code), software modules, etc. for implementing a wireless communication method according to an embodiment of the present disclosure.

The storage 1003 is a computer-readable recording medium, for example, a flexible disk, a floppy (registered trademark) disk, a magneto-optical disk (for example, a compact disk (Compact Disc ROM (CD-ROM), etc.), a digital versatile disk, Blu-ray disc), removable disc, hard disk drive, smart card, flash memory device (e.g., card, stick, key drive), magnetic stripe, database, server, or other suitable storage medium may be configured by Storage 1003 may also be called an auxiliary storage device.

The communication device 1004 is hardware (transmitting/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, or the like. The communication device 1004 includes a high-frequency switch, duplexer, filter, frequency synthesizer, etc. in order to realize at least one of frequency division duplex (FDD) and time division duplex (TDD), for example. may be configured to include For example, the transmitting/receiving unit 120 (220), the transmitting/receiving antenna 130 (230), and the like described above may be realized by the communication device 1004. FIG. The transmitter/receiver 120 (220) may be physically or logically separated into a transmitter 120a (220a) and a receiver 120b (220b).

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

Each device such as the processor 1001 and the memory 1002 is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using different buses between devices.

In addition, the base station 10 and the user terminal 20 include a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), a field programmable gate array (FPGA), etc. It may be configured including hardware, and a part or all of each functional block may be realized using the hardware. For example, processor 1001 may be implemented using at least one of these pieces of hardware.

(Modification)
The terms explained in this disclosure and the terms necessary for understanding the present disclosure may be replaced with terms having the same or similar meanings. For example, channel, symbol and signal (signal or signaling) may be interchanged. A signal may also be a message. A reference signal may be abbreviated as RS, and may also be called a pilot, a pilot signal, etc., depending on the applicable standard. A component carrier (CC) may also be called a cell, a frequency carrier, a carrier frequency, or the like.

A radio frame may consist of one or more periods (frames) in the time domain. Each of the one or more periods (frames) that make up a radio frame may be called a subframe. Furthermore, a subframe may consist of one or more slots in the time domain. A subframe may be a fixed time length (eg, 1 ms) independent of numerology.

Here, a numerology may be a communication parameter applied to at least one of transmission and reception of a certain signal or channel. Numerology, for example, subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame configuration , a particular filtering process performed by the transceiver in the frequency domain, a particular windowing process performed by the transceiver in the time domain, and/or the like.

A slot may consist of one or more symbols (Orthogonal Frequency Division Multiplexing (OFDM) symbol, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol, etc.) in the time domain. A slot may also be a unit of time based on numerology.

A slot may contain multiple mini-slots. Each minislot may consist of one or more symbols in the time domain. A minislot may also be referred to as a subslot. A minislot may consist of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in time units larger than a minislot may be referred to as PDSCH (PUSCH) Mapping Type A. PDSCH (or PUSCH) transmitted using minislots may be referred to as PDSCH (PUSCH) mapping type B.

Radio frames, subframes, slots, minislots and symbols all represent time units when transmitting signals. Radio frames, subframes, slots, minislots and symbols may be referred to by other corresponding designations. Note that time units such as frames, subframes, slots, minislots, and symbols in the present disclosure may be read interchangeably.

For example, one subframe may be called a TTI, a plurality of consecutive subframes may be called a TTI, and one slot or one minislot may be called a TTI. That is, at least one of the subframe and TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (eg, 1-13 symbols), or a period longer than 1 ms may be Note that the unit representing the TTI may be called a slot, mini-slot, or the like instead of a subframe.

Here, TTI refers to, for example, the minimum scheduling time unit in wireless communication. For example, in the LTE system, a base station performs scheduling to allocate radio resources (frequency bandwidth, transmission power, etc. that can be used by each user terminal) to each user terminal on a TTI basis. Note that the definition of TTI is not limited to this.

A TTI may be a transmission time unit such as a channel-encoded data packet (transport block), code block, or codeword, or may be a processing unit such as scheduling and link adaptation. Note that when a TTI is given, the time interval (for example, the number of symbols) in which transport blocks, code blocks, codewords, etc. are actually mapped may be shorter than the TTI.

When one slot or one minislot is called a TTI, one or more TTIs (that is, one or more slots or one or more minislots) may be the minimum scheduling time unit. Also, the number of slots (the number of mini-slots) constituting the minimum time unit of the scheduling may be controlled.

A TTI having a time length of 1 ms may be called a normal TTI (TTI in 3GPP Rel. 8-12), normal TTI, long TTI, normal subframe, normal subframe, long subframe, slot, or the like. A TTI that is shorter than a normal TTI may be called a shortened TTI, a short TTI, a partial or fractional TTI, a shortened subframe, a short subframe, a minislot, a subslot, a slot, and the like.

Note that the long TTI (e.g., normal TTI, subframe, etc.) may be replaced with a TTI having a time length exceeding 1 ms, and the short TTI (e.g., shortened TTI, etc.) is less than the TTI length of the long TTI and 1 ms A TTI having the above TTI length may be read instead.

A resource block (RB) is a resource allocation unit in the time domain and frequency domain, and may include one or more consecutive subcarriers (subcarriers) in the frequency domain. The number of subcarriers included in the RB may be the same regardless of the neumerology, eg twelve. The number of subcarriers included in an RB may be determined based on neumerology.

Also, an RB may contain one or more symbols in the time domain and may be 1 slot, 1 minislot, 1 subframe or 1 TTI long. One TTI, one subframe, etc. may each be configured with one or more resource blocks.

One or more RBs are Physical Resource Block (PRB), Sub-Carrier Group (SCG), Resource Element Group (REG), PRB pair, RB Also called a pair.

Also, a resource block may be composed of one or more resource elements (Resource Element (RE)). For example, 1 RE may be a radio resource region of 1 subcarrier and 1 symbol.

A Bandwidth Part (BWP) (which may also be called a bandwidth part) represents a subset of contiguous common resource blocks (RBs) for a numerology on a carrier. good too. Here, the common RB may be identified by an RB index based on the common reference point of the carrier. PRBs may be defined in a BWP and numbered within that BWP.

BWP may include UL BWP (BWP for UL) and DL BWP (BWP for DL). One or multiple BWPs may be configured for a UE within one carrier.

At least one of the configured BWPs may be active, and the UE may not expect to transmit or receive a given signal/channel outside the active BWP. Note that "cell", "carrier", etc. in the present disclosure may be read as "BWP".

It should be noted that the structures of radio frames, subframes, slots, minislots, symbols, etc. described above are merely examples. For example, the number of subframes contained in a radio frame, the number of slots per subframe or radio frame, the number of minislots contained within a slot, the number of symbols and RBs contained in a slot or minislot, the number of Configurations such as the number of subcarriers and the number of symbols in a TTI, symbol length, cyclic prefix (CP) length, etc. can be varied.

In addition, the information, parameters, etc. described in the present disclosure may be expressed using absolute values, may be expressed using relative values from a predetermined value, or may be expressed using other corresponding information. may be represented. For example, radio resources may be indicated by a predetermined index.

The names used for parameters and the like in this disclosure are not restrictive names in any respect. Further, the formulas and the like using these parameters may differ from those expressly disclosed in this disclosure. Since the various channels (PUCCH, PDCCH, etc.) and information elements can be identified by any suitable names, the various names assigned to these various channels and information elements are not limiting names in any way. .

The information, signals, etc. 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, etc. that may be referred to throughout the above description may refer to voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any of these. may be represented by a combination of

Also, information, signals, etc. can be output from a higher layer to a lower layer and/or from a lower layer to a higher layer. Information, signals, etc. may be input and output through multiple network nodes.

Input/output information, signals, etc. may be stored in a specific location (for example, memory), or may be managed using a management table. Input and output information, signals, etc. may be overwritten, updated or appended. Output information, signals, etc. may be deleted. Input information, signals, etc. may be transmitted to other devices.

Notification of information is not limited to the aspects/embodiments described in the present disclosure, and may be performed using other methods. For example, the notification of information in the present disclosure includes physical layer signaling (e.g., Downlink Control Information (DCI)), Uplink Control Information (UCI)), upper layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB), etc.), Medium Access Control (MAC) signaling), other signals, or combinations thereof may be performed by

The physical layer signaling may also be called Layer 1/Layer 2 (L1/L2) control information (L1/L2 control signal), L1 control information (L1 control signal), and the like. RRC signaling may also be called an RRC message, and may be, for example, an RRC connection setup message, an RRC connection reconfiguration message, or the like. Also, MAC signaling may be notified using, for example, a MAC Control Element (CE).

In addition, notification of predetermined information (for example, notification of “being X”) is not limited to explicit notification, but implicit notification (for example, by not notifying the predetermined information or by providing another information by notice of

The determination may be made by a value (0 or 1) represented by 1 bit, or by a boolean value represented by true or false. , may be performed by numerical comparison (eg, comparison with a predetermined value).

Software, whether referred to as software, firmware, middleware, microcode, hardware description language or otherwise, includes instructions, instruction sets, code, code segments, program code, programs, subprograms, and software modules. , applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, and the like.

In addition, software, instructions, information, etc. may be transmitted and received via a transmission medium. For example, the software uses wired technology (coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and/or wireless technology (infrared, microwave, etc.) , a server, or other remote source, these wired and/or wireless technologies are included within the definition of transmission media.

The terms "system" and "network" used in this disclosure may be used interchangeably. A “network” may refer to devices (eg, base stations) included in a network.

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

In the present disclosure, "base station (BS)", "radio base station", "fixed station", "NodeB", "eNB (eNodeB)", "gNB (gNodeB)", "Access point", "Transmission Point (TP)", "Reception Point (RP)", "Transmission/Reception Point (TRP)", "Panel" , “cell,” “sector,” “cell group,” “carrier,” “component carrier,” etc. may be used interchangeably. A base station may also be referred to by terms such as macrocell, small cell, femtocell, picocell, and the like.

A base station can accommodate one or more (eg, three) cells. When a base station accommodates multiple cells, the overall coverage area of the base station can be partitioned into multiple smaller areas, and each smaller area is assigned to a base station subsystem (e.g., a small indoor base station (Remote Radio)). Head (RRH))) may also provide communication services. The terms "cell" or "sector" refer to part or all of the coverage area of at least one of the base stations and base station subsystems that serve communication within such coverage.

In this disclosure, terms such as "Mobile Station (MS)", "user terminal", "User Equipment (UE)", and "terminal" are used interchangeably. can be

Mobile stations include subscriber stations, mobile units, subscriber units, wireless units, remote units, mobile devices, wireless devices, wireless communication devices, remote devices, mobile subscriber stations, access terminals, mobile terminals, wireless terminals, remote terminals. , a handset, a user agent, a mobile client, a client, or some other suitable term.

At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a wireless communication device, or the like. At least one of the base station and the mobile station may be a device mounted on a moving object, the mobile itself, or the like.

The moving body refers to a movable object, the speed of movement is arbitrary, and it naturally includes cases where the moving body is stationary. Examples of such moving bodies include vehicles, transportation vehicles, automobiles, motorcycles, bicycles, connected cars, excavators, bulldozers, wheel loaders, dump trucks, forklifts, trains, buses, carts, rickshaws, and ships (ships and other watercraft). , airplanes, rockets, satellites, drones, multi-copters, quad-copters, balloons and objects mounted on them. Further, the mobile body may be a mobile body that autonomously travels based on an operation command.

The mobile object may be a vehicle (e.g., car, airplane, etc.), an unmanned mobile object (e.g., drone, self-driving car, etc.), or a robot (manned or unmanned ). Note that at least one of the base station and the mobile station includes devices that do not necessarily move during communication operations. For example, at least one of the base station and mobile station may be an Internet of Things (IoT) device such as a sensor.

FIG. 26 is a diagram showing an example of a vehicle according to one embodiment. The vehicle 40 includes a drive unit 41, a steering unit 42, an accelerator pedal 43, a brake pedal 44, a shift lever 45, left and right front wheels 46, left and right rear wheels 47, an axle 48, an electronic control unit 49, various sensors (current sensor 50, revolution sensor 51, air pressure sensor 52, vehicle speed sensor 53, acceleration sensor 54, accelerator pedal sensor 55, brake pedal sensor 56, shift lever sensor 57, and object detection sensor 58), information service unit 59 and communication module 60. Prepare.

The driving unit 41 is composed of, for example, at least one of an engine, a motor, and a hybrid of an engine and a motor. The steering unit 42 includes at least a steering wheel (also referred to as a steering wheel), and is configured to steer at least one of the front wheels 46 and the rear wheels 47 based on the operation of the steering wheel operated by the user.

The electronic control unit 49 is composed of a microprocessor 61 , a memory (ROM, RAM) 62 , and a communication port (eg, input/output (IO) port) 63 . Signals from various sensors 50 to 58 provided in the vehicle are input to the electronic control unit 49 . The electronic control unit 49 may be called an Electronic Control Unit (ECU).

The signals from the various sensors 50 to 58 include a current signal from the current sensor 50 that senses the current of the motor, a rotation speed signal of the front wheels 46/rear wheels 47 obtained by the rotation speed sensor 51, and an air pressure sensor 52. air pressure signal of front wheels 46/rear wheels 47, vehicle speed signal obtained by vehicle speed sensor 53, acceleration signal obtained by acceleration sensor 54, depression amount signal of accelerator pedal 43 obtained by accelerator pedal sensor 55, brake pedal sensor The brake pedal 44 depression amount signal obtained by 56, the operation signal of the shift lever 45 obtained by the shift lever sensor 57, and the detection for detecting obstacles, vehicles, pedestrians, etc. obtained by the object detection sensor 58. There are signals.

The information service unit 59 includes various devices such as car navigation systems, audio systems, speakers, displays, televisions, and radios for providing (outputting) various information such as driving information, traffic information, and entertainment information, and these devices. and one or more ECUs that control The information service unit 59 provides various information/services (for example, multimedia information/multimedia services) to the occupants of the vehicle 40 using information acquired from an external device via the communication module 60 or the like.

The information service unit 59 may include an input device (e.g., keyboard, mouse, microphone, switch, button, sensor, touch panel, etc.) that receives input from the outside, and an output device that outputs to the outside (e.g., display, speaker, LED lamp, touch panel, etc.).

The driving support system unit 64 includes a millimeter wave radar, Light Detection and Ranging (LiDAR), a camera, a positioning locator (e.g., Global Navigation Satellite System (GNSS), etc.), map information (e.g., High Definition (HD)) maps, autonomous vehicle (AV) maps, etc.), gyro systems (e.g., inertial measurement units (IMU), inertial navigation systems (INS), etc.), artificial intelligence ( Artificial intelligence (AI) chips, AI processors, and other devices that provide functions to prevent accidents and reduce the driver's driving load, and one or more devices that control these devices ECU. In addition, the driving support system unit 64 transmits and receives various information via the communication module 60, and realizes a driving support function or an automatic driving function.

The communication module 60 can communicate with the microprocessor 61 and components of the vehicle 40 via the communication port 63 . For example, the communication module 60 communicates with the vehicle 40 through a communication port 63 such as a driving unit 41, a steering unit 42, an accelerator pedal 43, a brake pedal 44, a shift lever 45, left and right front wheels 46, left and right rear wheels 47, Data (information) is transmitted and received between the axle 48, the microprocessor 61 and memory (ROM, RAM) 62 in the electronic control unit 49, and various sensors 50-58.

The communication module 60 is a communication device that can be controlled by the microprocessor 61 of the electronic control unit 49 and can communicate with an external device. For example, it transmits and receives various information to and from an external device via wireless communication. Communication module 60 may be internal or external to electronic control 49 . The external device may be, for example, the above-described base station 10, user terminal 20, or the like. Also, the communication module 60 may be, for example, at least one of the base station 10 and the user terminal 20 described above (and may function as at least one of the base station 10 and the user terminal 20).

The communication module 60 receives signals from the various sensors 50 to 58 described above input to the electronic control unit 49, information obtained based on the signals, and input from the outside (user) obtained via the information service unit 59. may be transmitted to the external device via wireless communication. The electronic control unit 49, the various sensors 50-58, the information service unit 59, etc. may be called an input unit that receives input. For example, the PUSCH transmitted by communication module 60 may include information based on the above inputs.

The communication module 60 receives various information (traffic information, signal information, inter-vehicle information, etc.) transmitted from an external device and displays it on the information service unit 59 provided in the vehicle. The information service unit 59 is an output unit that outputs information (for example, outputs information to devices such as displays and speakers based on the PDSCH received by the communication module 60 (or data/information decoded from the PDSCH)). may be called

Also, the communication module 60 stores various information received from an external device in a memory 62 that can be used by the microprocessor 61 . Based on the information stored in the memory 62, the microprocessor 61 controls the drive unit 41, the steering unit 42, the accelerator pedal 43, the brake pedal 44, the shift lever 45, the left and right front wheels 46, and the left and right rear wheels provided in the vehicle 40. 47, axle 48, and various sensors 50-58 may be controlled.

Also, the base station in the present disclosure may be read as a user terminal. For example, communication between a base station and a user terminal is replaced with communication between multiple user terminals (for example, Device-to-Device (D2D), Vehicle-to-Everything (V2X), etc.) Regarding the configuration, each aspect/embodiment of the present disclosure may be applied. In this case, the user terminal 20 may have the functions of the base station 10 described above. In addition, words such as "uplink" and "downlink" may be replaced with words corresponding to communication between terminals (for example, "sidelink"). For example, uplink channels, downlink channels, etc. may be read as sidelink channels.

Similarly, user terminals in the present disclosure may be read as base stations. In this case, the base station 10 may have the functions of the user terminal 20 described above.

In the present disclosure, operations that are assumed to be performed by the base station may be performed by its upper node in some cases. In a network that includes one or more network nodes with a base station, various operations performed for communication with a terminal may involve the base station, one or more network nodes other than the base station (e.g., Clearly, this can be done by a Mobility Management Entity (MME), Serving-Gateway (S-GW), etc. (but not limited to these) or a combination thereof.

Each aspect/embodiment described in the present disclosure may be used alone, may be used in combination, or may be used by switching along with execution. Also, the processing procedures, sequences, flowcharts, etc. of each aspect/embodiment described in the present disclosure may be rearranged as long as there is no contradiction. For example, the methods described in this disclosure present elements of the various steps using a sample order, and are not limited to the specific order presented.

Each aspect/embodiment described in this disclosure includes Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system ( 4G), 5th generation mobile communication system (5G), 6th generation mobile communication system (6G), xth generation mobile communication system (xG (x is, for example, an integer or a decimal number)), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802 .11 (Wi-Fi®), IEEE 802.16 (WiMAX®), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth®, or any other suitable wireless communication method. It may be applied to a system to be used, a next-generation system extended, modified, created or defined based on these. Also, multiple systems may be applied in combination (for example, a combination of LTE or LTE-A and 5G).

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

Any reference to elements using the "first," "second," etc. designations used in this disclosure does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, references to first and second elements do not imply that only two elements may be employed or that the first element must precede the second element in any way.

The term "determining" as used in this disclosure may encompass a wide variety of actions. For example, "determination" includes judging, calculating, computing, processing, deriving, investigating, looking up, searching, inquiry ( For example, looking up in a table, database, or another data structure), ascertaining, etc. may be considered to be "determining."

Also, "determining (deciding)" includes receiving (e.g., receiving information), transmitting (e.g., transmitting information), input, output, access ( accessing (e.g., accessing data in memory), etc.

Also, "determining" is considered to be "determining" resolving, selecting, choosing, establishing, comparing, etc. good too. That is, "determining (determining)" may be regarded as "determining (determining)" some action.

Also, "judgment (decision)" may be read as "assuming", "expecting", or "considering".

The terms “connected”, “coupled”, or any variation thereof, as used in this disclosure, refer to any connection or coupling, direct or indirect, between two or more elements. and can include the presence of one or more intermediate elements between two elements that are "connected" or "coupled" to each other. Couplings or connections between elements may be physical, logical, or a combination thereof. For example, "connection" may be read as "access".

In this disclosure, when two elements are connected, using one or more wires, cables, printed electrical connections, etc., and as some non-limiting and non-exhaustive examples, radio frequency domain, microwave They can be considered to be “connected” or “coupled” together using the domain, electromagnetic energy having wavelengths in the optical (both visible and invisible) domain, and the like.

In the present disclosure, the term "A and B are different" may mean "A and B are different from each other." The term may also mean that "A and B are different from C". Terms such as "separate," "coupled," etc. may also be interpreted in the same manner as "different."

Where "include," "including," and variations thereof are used in this disclosure, these terms are inclusive, as is the term "comprising." is intended. Furthermore, the term "or" as used in this disclosure is not intended to be an exclusive OR.

In this disclosure, when articles are added by translation, such as a, an, and the in English, the disclosure may include that 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 changes without departing from the spirit and scope of the invention determined based on the description of the claims. Therefore, the description of the present disclosure is for illustrative purposes and does not impose any limitation on the invention according to the present disclosure.

Claims

a receiver that receives information about the frequency domain density of the channel state information reference signal;
a control unit that controls reception of the channel state information reference signal supporting at least one mapping of different ports and different CDM groups to a plurality of resource blocks when the frequency domain density is less than 1. .
The terminal according to claim 1, wherein the receiving unit receives frequency domain allocation information of channel state reference signals including bitmaps indicating subcarriers in the plurality of resource blocks.
The terminal according to claim 2, wherein the size of said bitmap is variable according to said frequency domain density.
The receiving unit receives frequency domain allocation information of a channel state reference signal, and the control unit performs reception of the channel state information reference signal by applying a predetermined offset to the frequency domain allocation information of the channel state reference signal. A terminal according to claim 1 for controlling.
receiving information about the frequency domain density of channel state information reference signals;
and controlling reception of the channel state information reference signal supporting at least one mapping of different ports and different CDM groups to multiple resource blocks when the frequency domain density is less than 1. wireless communication method.
a receiving unit for transmitting information about the frequency domain density of channel state information reference signals;
a control unit that controls transmission of the channel state information reference signal supporting at least one mapping of different ports and different CDM groups to a plurality of resource blocks when the frequency domain density is less than 1. station.