WO2021014493A1

WO2021014493A1 - Terminal and wireless communication method

Info

Publication number: WO2021014493A1
Application number: PCT/JP2019/028466
Authority: WO
Inventors: 祐輝松村; 佑一柿島; 聡永田
Original assignee: 株式会社Ｎｔｔドコモ
Priority date: 2019-07-19
Filing date: 2019-07-19
Publication date: 2021-01-28
Also published as: CN117880838A; CN114175710A; CN114175710B

Abstract

A terminal according to an aspect of the present disclosure is characterized by comprising: a reception unit that receives relevant information of at least one of digital pre-coded signal and channel; and a control unit that, on the basis of the relevant information, executes a processing of at least one of the signal and channel. According to an aspect of the present disclosure, signal/ channel to which pre-coding has been applied can be appropriately processed.

Description

Terminal and wireless communication method

The present disclosure relates to terminals and wireless communication methods 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-speed data rate, low latency, 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).

A successor system to LTE (for example, 5th generation mobile communication system (5G), 5G + (plus), New Radio (NR), 3GPP Rel.15 or later, etc.) is also being considered.

In future wireless communication systems (for example, NR), a beam management method has been introduced. For example, in NR, it is considered to form (or use) a beam at at least one of a base station and a user terminal (user terminal, User Equipment (UE)).

Beams can be broadly divided into digital beams (digital precoding) that can form multiple beams at the same time and analog beams (analog precoding) that can form up to one beam at the same time.

In future wireless communication systems (for example, NR after Rel-17), even if the frequency is high, the operation of only the digital beam without using the analog beam (which may be called full digital operation) may be used. It is expected that operations that predominantly use digital beams will be used.

If the information held by the UE is insufficient for the signal / channel to which the precoding (beam) is applied, the UE may not be able to process the signal / channel properly. If the UE cannot properly process the signal / channel to which the precoding (beam) is applied, the increase in communication throughput may be suppressed.

Therefore, one of the purposes of the present disclosure is to provide a terminal and a wireless communication method capable of appropriately processing a signal / channel to which precoding is applied.

The terminal according to one aspect of the present disclosure executes processing for at least one of the signal and the channel based on the receiving unit that receives the related information of at least one of the digitally precoded signal and the channel and the related information. It is characterized by having a control unit.

According to one aspect of the present disclosure, signals / channels to which precoding has been applied can be appropriately processed.

1A and 1B are diagrams showing an example of a transmission / reception configuration in which beam management is used. FIG. 2 is a diagram showing a forecast of progress in MIMO technology. 3A and 3B are diagrams showing an example of beam operation. FIG. 4 is a diagram showing an example in which beams interfere with other UEs. FIG. 5 is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment. FIG. 6 is a diagram showing an example of the configuration of the base station according to the embodiment. FIG. 7 is a diagram showing an example of the configuration of the user terminal according to the embodiment. FIG. 8 is a diagram showing an example of the hardware configuration of the base station and the user terminal according to the embodiment.

(Beam management)
In NR, a beam management method has been introduced. For example, in NR, it is considered to form (or utilize) a beam in at least one of a base station and a UE.

By applying beam forming (Beam Forming (BF)), it is expected to reduce the difficulty of ensuring coverage due to the increase in carrier frequency and reduce radio wave propagation loss.

BF is a technique for forming a beam (antenna directivity) by controlling the amplitude / phase of a signal transmitted or received from each element (also called precoding) using, for example, a super multi-element antenna. .. Multiple Input Multiple Output (MIMO) using such a super multi-element antenna is also called large-scale MIMO (massive MIMO).

1A and 1B are diagrams showing an example of a transmission / reception configuration in which beam management is used. In this example, the transmitting (Tx) side can form four beams (transmitting beams # 1- # 4), and the receiving (Rx) side forms two beams (receiving beams # 1- # 2). Imagine a system where it is possible.

In such a system, as shown in FIG. 1A, it is preferable to perform beam sweeping in both transmission and reception, and to control so as to select an appropriate pair from all eight patterns of transmission / reception beam pair candidates shown in FIG. 1B. ..

The pair of the transmitting beam and the receiving beam may be called a beam pair. For example, the transmitting beam # 3 and the receiving beam # 2 as shown in FIG. 1A may be identified as the beam pair candidate index = 6 in FIG. 1B.

Note that, in beam management, instead of using a single beam, multiple levels of beam control such as a thick beam (rough beam) and a thin beam (fine beam) may be performed.

BF can be classified into digital BF and analog BF. Digital BF and analog BF may be referred to as digital precoding and analog precoding, respectively.

Digital BF is, for example, a method of performing precoding signal processing (for a digital signal) on the baseband. In this case, parallel processing such as inverse fast Fourier transform (IFFT), digital-to-analog converter (DAC), and radio frequency (RF) is performed by the antenna port (or RF chain (RF)). Only the number of chain)) is required. On the other hand, as many beams as the number of RF chains can be formed at any timing.

Analog BF is, for example, a method of using a phase shifter on RF. Although the analog BF cannot form a plurality of beams at the same timing, it can be easily configured and inexpensively realized because it only rotates the phase of the RF signal.

A hybrid BF configuration that combines a digital BF and an analog BF is also feasible. In NR, the introduction of large-scale MIMO is being considered, but if a huge number of beams are formed only by digital BF, the circuit configuration becomes expensive, so the use of hybrid BF configuration is also expected.

(TCI, spatial relationship, QCL)
In the NR, at least one of the signal and the channel (may be expressed as a signal / channel. Hereinafter, “A / B” is similarly referred to as “A / B” based on the transmission configuration indication state (TCI state)). Receive processing (eg, at least one of reception, demapping, demodulation, decoding), transmission processing (eg, transmission, mapping, precoding, modulation, coding) of "at least one of A and B") At least one of) is being considered for control.

The TCI state may represent what applies to the downlink signal / channel. The equivalent of the TCI state applied to the uplink signal / channel may be expressed as a spatial relation.

The TCI state is information related to signal / channel pseudo colocation (Quasi-Co-Location (QCL)), and may be called spatial reception parameters, spatial relation information (SRI), or the like. The TCI state may be set in the UE per channel or per signal.

QCL is an index showing the statistical properties of signals / channels. For example, when one signal / channel and another signal / channel have a QCL relationship, a Doppler shift, a Doppler spread, and an average delay are performed between these different signals / channels. ), Delay spread, and spatial parameter (for example, spatial Rx parameter) can be assumed to be the same (QCL for at least one of these). You may.

The spatial reception parameter may correspond to the received beam of the UE (for example, the received analog beam), or the beam may be specified based on the spatial QCL. The QCL (or at least one element of the QCL) in the present disclosure may be read as sQCL (spatial QCL).

A plurality of types (QCL types) may be specified for the QCL. For example, four QCL types AD with different parameters (or parameter sets) that can be assumed to be the same may be provided, and the parameters are shown below:
QCL Type A: Doppler shift, Doppler spread, average delay and delay spread,
・ QCL type B: Doppler shift and Doppler spread,
-QCL type C: Doppler shift and average delay,
-QCL type D: Spatial reception parameter.

Types A to C may correspond to QCL information related to synchronization processing of at least one of time and frequency, and type D may correspond to QCL information related to beam control.

The UE may assume that a given control resource set (Control Resource Set (CORESET)) has a specific QCL (eg, QCL type D) relationship with another CORESET, channel or reference signal. , QCL assumption (QCL assumption) may be called.

The UE may determine at least one of the transmission beam (Tx beam) and the reception beam (Rx beam) of the signal / channel based on the TCI state of the signal / channel or the QCL assumption.

The TCI state is, for example, a target channel (or a reference signal (Reference Signal (RS)) for the channel) and another signal (for example, another downlink reference signal (Downlink Reference Signal (DL-RS))). It may be information about QCL with. The TCI state may be set (instructed) by higher layer signaling, physical layer signaling, or a combination thereof.

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

For MAC signaling, for example, a MAC control element (MAC Control Element (MAC CE)), a MAC Protocol Data Unit (PDU), or the like may be used. The broadcast information includes, for example, a master information block (Master Information Block (MIB)), a system information block (System Information Block (SIB)), a minimum system information (Remaining Minimum System Information (RMSI)), and other system information ( Other System Information (OSI)) may be used.

The physical layer signaling may be, for example, downlink control information (DCI).

The channels for which the TCI state is set (designated) are, for example, a downlink shared channel (Physical Downlink Shared Channel (PDSCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), and an uplink shared channel (Physical Uplink Shared Channel (PUSCH)). )), It may be at least one of the uplink control channel (Physical Uplink Control Channel (PUCCH)).

Further, RS (DL-RS) having a QCL relationship with the channel is, for example, a synchronization signal block (Synchronization Signal Block (SSB)), a channel state information reference signal (Channel State Information Reference Signal (CSI-RS)), and measurement. It may be at least one of the reference signal (Sounding Reference Signal (SRS)). Alternatively, the DL-RS may be a CSI-RS (also referred to as a Tracking Reference Signal (TRS)) used for tracking or a reference signal (also referred to as a QRS) used for QCL detection.

The SSB is a signal block including at least one of a primary synchronization signal (Primary Synchronization Signal (PSS)), a secondary synchronization signal (Secondary Synchronization Signal (SSS)), and a broadcast channel (Physical Broadcast Channel (PBCH)). The SSB may be referred to as an SS / PBCH block.

The information element of the TCI state (“TCI-state IE” of RRC) set by the upper layer signaling may include one or more QCL information (“QCL-Info”). The QCL information may include at least one of information related to DL-RS having a QCL relationship (DL-RS related information) and information indicating a QCL type (QCL type information). The DL-RS related information includes the DL-RS index (for example, SSB index, non-zero power CSI-RS (Non-Zero-Power (NZP) CSI-RS) resource ID (Identifier)), and the index of the cell in which the RS is located. , Information such as the index of Bandwidth Part (BWP) where RS is located may be included.

(Progress in MIMO technology and beam)
By the way, MIMO technology has been used in a frequency band (or frequency band) lower than 6 GHz, but it is being studied to apply it to a frequency band higher than 6 GHz in the future.

A frequency band lower than 6 GHz may be referred to as sub-6, frequency range (FR) 1, or the like. Frequency bands higher than 6 GHz may be referred to as above-6, FR2, millimeter wave (mmW), FR4 and the like.

FIG. 2 is a diagram showing a forecast of progress in MIMO technology. FIG. 2 shows an example of how many MIMO layers can be realized at each frequency for each age group (for example, 2020, 2030, 2040s), with frequency on the horizontal axis and the number of MIMO layers on the vertical axis. ing. The maximum number of MIMO layers is assumed to be limited by antenna size.

For example, looking at the lines of the 2020s, it can be seen that the number of layers is the largest in the frequency band of about sub 6 GHz, and the number of layers is quite small in the high frequency band such as 28 GHz. In addition, there is an application boundary of digital precoding and analog precoding around the middle of these frequency bands. In this age group, it is assumed that sub 6 GHz communication can be realized by using digital precoding, but communication of about 28 GHz cannot be realized. Note that analog precoding may be applicable regardless of the frequency band.

By the 2030s, it is expected that the number of MIMO layers will increase overall by adopting advanced technologies such as non-linear precoding, and that precoding will be applicable even in higher frequency bands. To. Therefore, it is expected that a line obtained by expanding the line of the 2020s toward the upper right of the drawing will be the line of the 2030s.

The line of the 2040s is expected to be a line that is a further expansion of the line of the 2030s toward the upper right of the drawing. In this era, it is expected that sub 6 GHz communication can be realized by using digital precoding even in a frequency band higher than 28 GHz. The boundaries of digital precoding are expected to shift to frequency bands much higher than in the 2020s.

Even with mmW, it is expected that the degree of freedom and diversity of MIMO multiplexing will be improved and the throughput will be improved by using higher-order MIMO and cooperating with a plurality of UEs.

In this way, in future wireless communication systems (for example, NR after Rel-17), even if the frequency is high (for example, FR2), only the digital beam is operated without using the analog beam (called full digital operation). It is assumed that (may) will be used, or operations that predominantly use digital beams will be used.

For example, in the case of full digital operation, improvement of frequency utilization efficiency can be expected by applying orthogonal precoding (or orthogonal beam, digital beam) to a plurality of UEs at the same time. If the digital beam is not applied properly, interference between UEs will increase, leading to deterioration of communication quality (or decrease in cell capacity). The orthogonality of the present disclosure may be read as quasi-orthogonal.

FIGS. 3A and 3B are diagrams showing an example of beam operation. In this example, FR2 is assumed, but the frequency range of the present disclosure is not limited to this. FIG. 3A shows the operation of the analog beam as used in Rel-15, and FIG. 3B shows the operation of the digital beam as used in Rel-17 and later.

In FIG. 3A, a base station (transmission / reception point (TRP), which may be read as a panel, etc.) can transmit only one beam (beam # 2 in FIG. 3A) at a certain time. Therefore, the base station switches the beam to the UE to transmit and receive.

In FIG. 3B, the base station can transmit a plurality of beams (beams # 1 to # 4 in FIG. 3B) at a certain time. Therefore, the base station can transmit and receive to and from a plurality of UEs using different beams at the same time.

Therefore, the present inventors have conceived a method for the UE to appropriately process a signal / channel to which precoding (for example, a digital beam) is applied.

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

In the present disclosure, "precoding" may be read as "digital precoding". Further, "DL channel" may be read as "DL channel / RS", "DL channel / RS corresponding to the DL channel", "DMRS of DL channel" and the like.

(Wireless communication method)
<First Embodiment>
In the first embodiment, the UE receives information regarding the application of precoding to at least one of the precoded signals and channels, and based on that information, performs processing on at least one of the signals and channels. The information may be referred to as precoding-related information or the like. Further, when the UE does not receive the precoding related information, the UE may execute the above processing based on a predetermined assumption.

(Method 1)
The base station performs the same precoding on the CSI-RS as the DL channel, and notifies the UE that the same precoding has been performed. In this case, the CSI-RS and the DL channel may be considered to have a QCL relationship. Further, in this case, the UE assumes that the TCI state (TCI state) set or instructed for the DL channel includes the CSI-RS as an RS (DL-RS) having a QCL relationship with the DL channel. May be good.

When the base station notifies that the same precoding has been performed on the CSI-RS and the DL channel, the UE assumes that the same precoding has been performed on the CSI-RS and the DL channel. In this case, the UE may use the measurement result of CSI-RS for demodulation of DL data. This allows the UE to improve the accuracy of demodulation. In the present disclosure, demodulation of DL data may include channel estimation.

(Method 2)
The base station does not do the same precoding on the CSI-RS and DL channels. In this case, the base station notifies the UE that the same precoding has not been performed on the CSI-RS and the DL channel. Alternatively, the base station does not have to notify the UE whether or not the same precoding has been performed on the CSI-RS and the DL channel.

When the base station notifies that the UE has not performed the same precoding on the CSI-RS and the DL channel, or whether the UE has performed the same precoding on the CSI-RS and the DL channel from the base station. If not notified, it is assumed that the same precoding was not performed on the CSI-RS and the DL channel. In this case, the UE assumes that a predetermined transmission signal sequence is transmitted as CSI-RS, and decides not to use the measurement result of CSI-RS for demodulation of DL data. This allows the UE to prevent the demodulation accuracy from being reduced by using improper CSI-RS measurement results.

When the base station does not perform the same precoding on the CSI-RS and the DL channel, an example in which the CSI-RS is not precoded (method 2-1) and a different precoding on the CSI-RS and the DL channel are applied. An example of this (method 2-2) can be considered. Hereinafter, Method 2-1 and Method 2-2 will be described.

(Method 2-1)
The base station does not precode the CSI-RS. In this case, a predetermined transmission signal sequence is used for the transmission signal of the CSI-RS. Further, in this case, the CSI-RS and the DL channel may be regarded as not having a QCL relationship. Further, in this case, CSI-RS may not be set in the TCIstate of the DL channel.

If the base station does not precode the CSI-RS, it may notify the DL channel that the precoding has been performed. In this case, the UE is a precoder applied to the DL channel based on downlink control information (DCI) from a predetermined set of precoders (candidates) or a set of precoders notified by higher layer signaling. May be identified.

Further, if the base station does not precode the CSI-RS, it does not have to notify the DL channel that the precoding has been performed. In this case, the UE may not expect that the TCI state set or indicated for the DL channel will include a CSI-RS as an RS (DL-RS) that has a QCL relationship with the DL channel.

(Method 2-2)
The base station precodes the CSI-RS differently from the DL channel. The base station may apply, for example, a precoder different from the DL channel to the CSI-RS. In this case, the CSI-RS precoder set and the DL channel precoder set are in at least one of the precoder set (candidate) defined in advance by the specification and the precoder set notified by the upper layer signaling, respectively. It may be applicable.

The UE may identify the precoder applied to the CSI-RS from the above set of CSI-RS precoders based on the first DCI (eg, a predetermined field of the first DCI). .. Also, the UE applies to the DL channel from the set of precoders of the DL channel described above based on a second DCI different from the first DCI (eg, a predetermined field of the second DCI). The precoder to be used may be identified.

The UE may identify the precoder applied to the CSI-RS from the above-mentioned set of CSI-RS precoders based on the first field included in one DCI. In addition, the UE may identify the precoder applied to the DL channel from the above-mentioned set of DL channel precoders based on a field different from the first field included in the one DCI.

The setting or instruction information may include information on which CSI-RS and which channel the same precoding is applied to. The information may include an ID for identifying CSI-RS (CSI-RS ID), information for identifying a channel or a reference signal, and the like.

(CSI measurement)
CSI-RS with precoding applied (for example, it may be called precoded CSI-RS) and CSI-RS without precoding (for example, it may be called non-precoded CSI-RS). If CSI measurement is performed using both, the accuracy of CSI reporting deteriorates. For example, if the CSI measurement result of the former and the CSI-RS measurement result of the latter are averaged and the CSI measurement is performed, an appropriate channel measurement result cannot be obtained. Therefore, the UE may perform CSI measurement on either CSI-RS to which precoding is applied or CSI-RS to which precoding is not applied.

The UE may preferentially perform CSI measurement on CSI-RS to which precoding is applied. For example, when the CSI-RS to which the precoding is applied exists, the UE performs the CSI measurement on the CSI-RS to which the precoding is applied, and when the CSI-RS to which the precoding is applied does not exist, the UE performs the precoding. CSI measurement is performed for CSI-RS that has not been applied.

The UE may preferentially perform CSI measurement on CSI-RS to which precoding is not applied. For example, when the CSI-RS to which the precoding is not applied exists, the UE performs CSI measurement on the CSI-RS to which the precoding is not applied, and the CSI-RS to which the precoding is not applied exists. If not, CSI measurement is performed for CSI-RS to which precoding is applied.

The UE does not assume that both the precoded CSI-RS resource and the precoded CSI-RS resource are set in one CSI-RS resource set or CSI-RS resource unit. In this case, for example, since the presence or absence of precoding of CSI-RS is unified for each CSI-RS resource set, it is possible to easily obtain the CSI measurement result of only CSI-RS to which the precoding is applied.

Whether or not to apply precoding to CSI-RS may be set for each CSI-RS resource, or may be set for at least one unit such as a UE unit, a UE group unit, and a cell unit.

The UE may perform CSI measurement for each of CSI-RS to which precoding is applied and CSI-RS to which precoding is not applied, and report the CSI measurement result of one or both.

(Method 4)
The base station may use upper layer signaling, physical layer signaling, or a combination thereof for notification of whether or not precoding has been performed on CSI-RS (which may be referred to as information on whether or not precoding is applied). The base station may notify the presence or absence of precoding application by including it in the CSI-RS resource setting information, and may notify, for example, information on whether or not precoding is applied to some CSI-RS resources. Further, the base station may add a new bit field regarding whether or not precoding is applied to DCI and notify whether or not precoding is applied by using the bit field. The bit field may be notified, for example, with respect to the aperiodic CSI-RS (Aperiodic CSI-RS (A-CSI-RS)).

The UE may determine whether or not precoding has been applied to a specific CSI-RS based on the above information on whether or not precoding has been applied.

The number of CSI-RS ports can change depending on whether or not precoding is performed. Therefore, the base station may notify the UE of the number of CSI-RS ports. Then, the UE may determine whether the CSI-RS has been precoded based on the number of CSI-RS ports. The base station may use, for example, DCI, a higher layer, or MAC to notify the number of CSI-RS ports. Further, the base station may notify the candidate of the number of ports by using the upper layer or MAC, and the UE may determine the number of any port from the candidates by using DCI.

It will be described that the number of CSI-RS ports changes depending on whether or not precoding is performed. The number of CSI-RS ports is the same as the number of antennas when precoding is not performed, and is equal to or less than the number of antennas when precoding is performed. Assuming that the CSI-RS signal x that has not been precoded is x = Ps, it is expressed by the following equation (1). In equation (1), x = [x ₀ x ₁ x ₂ x ₃ ] ^T (T indicates a transposed matrix; the same applies hereinafter), and x ₀ to x ₃ indicate transmission signals from each antenna. In the example of equation (1), it is assumed that there are four physical antennas. When precoding is not applied, P corresponds to the identity matrix, which is a fourth-order identity matrix in equation (1). s = [s ₀ s ₁ s ₂ s ₃ ] ^T , and s ₀ to s ₃ indicate the CSI-RS signal sequence to be transmitted. That is, CSI-RS is transmitted on 4 ports.

When the signals to be transmitted are separated by orthogonal sequences, the CSI-RS signal sequences to be transmitted are represented as the following sequences 1 to 4. n indicates the number of subcarriers. Focusing on the subcarrier 1, for example, the signals to be transmitted are M1 (1), M2 (1), M3 (1), and M4 (1). In this case, M1 (1), M2 (1), M3 (1), and M4 (1) correspond to s ₀ to s ₃ and are transmitted from each antenna.
Series 1 = [M1 (0), M1 (1) ,. .. .. , M1 (n-1)]
Series 2 = [M2 (0), M2 (1) ,. .. .. , M2 (n-1)]
Series 3 = [M3 (0), M3 (1) ,. .. .. , M3 (n-1)]
Series 4 = [M4 (0), M4 (1) ,. .. .. , M4 (n-1)]

The precoded CSI-RS signal is expressed by the following equation (2). In the formula (2), x ₀ to x ₃ represent transmission signals from each antenna. In the example of the equation (2), it is assumed that there are four physical antennas as in the equation (1). s ₀ and s ₁ indicate the CSI-RS signal sequence to be transmitted. In addition, two beams, Beam1 and Beam2, are applied. It is assumed that p ₀₀ to p ₃₀ are precoders of Beam ₁ and p ₀₁ to p ₃₁ are precoders of Beam 2. P is a matrix of the number of physical antennas × CSI-RS port.

When the signal to be transmitted is separated by the precoder (beam), the signal to be transmitted is represented as the following series 1 and series 2. n indicates the number of subcarriers. Focusing on the subcarrier 1, for example, M1 (1) and M2 (1) correspond to s ₀ and s ₁ . The base station transmits these signals orthogonally by a precoder (beam).
Series 1 = [M1 (0), M1 (1) ,. .. .. , M1 (n-1)]
Series 2 = [M2 (0), M2 (1) ,. .. .. , M2 (n-1)]

The UE may determine the number of antenna ports of a specific CSI-RS based on the information on whether or not the precoding is applied. For example, when the UE receives information indicating that the precoding is applied to the CSI-RS, the UE may assume that the number of ports of the CSI-RS is a predetermined value. The predetermined value may be set in the UE by higher layer signaling or the like, or may be predetermined by specifications.

When the UE receives information indicating that precoding is not applied to CSI-RS, the UE may assume that the number of CSI-RS ports is equal to the number of physical antennas.

<Second embodiment>
In the second embodiment, the UE determines whether each precoding applied to the plurality of signals is equal or each precoding applied to the plurality of channels as information about at least one of the precoded signal and the channel. Receives information about the QCL that indicates whether they are equal or whether each precoding applied to the signal and channel is equal. Information about the QCL is transmitted from the base station to the UE using, for example, RRC signaling. Then, the UE executes processing for at least one of the signal and the channel based on the information.

A QCL type as a QCL indicating that each precoding applied to a plurality of signals is equal, each precoding applied to a plurality of channels is equal, or each precoding applied to a signal and a channel is equal. -E (which may be referred to as QCL-E) may be specified. In QCL type-E, "precoding" may be read as a spatial reception parameter ("Spatial Rx parameter") or a spatial transmission parameter ("Spatial Tx parameter"). This Spatial Rx parameter is 3GPP Rel. In order to distinguish it from the Spatial Rx parameter of QCL-D in 15, for example, Spatial Rx parameter II and Spatial Tx parameter II may be specified.

Even if the base station notifies the UE of the RS corresponding to the QCL type-E (for example, CSI-RS) as the TCI-state of a predetermined channel (for example, at least one of PDCCH, PDSCH, PUCCH and PUSCH). Good. The UE notified of the TCI status indicating the RS corresponding to the QCL type-E may assume that the precoding applied to the predetermined channel and the precoding applied to the RS are equal. For example, the UE may use the measurement result of the RS designated as QCL-E for demodulation of the DL channel (PDSCH, PDCCH, etc.).

If the RS corresponding to the QCL type-E is not notified as the TCI-state of the predetermined channel, the UE assumes that the same precoding was not performed on the RS and the DL channel. In this case, the UE may assume that precoding is not applied to the RS and a predetermined transmission signal sequence is transmitted. Further, in this case, the UE does not have to use the measurement result of the RS for demodulation of the DL channel (PDSCH, PDCCH, etc.).

Note that "equal precoding between RS1 and RS2" may be read as "QCL between RS1 and RS2".

<Third embodiment>
In a third embodiment, the UE is an interference canceller that applies to at least one of the signals and channels to another UE (which may be referred to as an interfering UE) as information about at least one of the precoded signals and channels. Receive the information to be used. Then, the UE executes processing (for example, interference cancellation) for at least one of the signal and the channel based on the information. In addition, "RS" in the third embodiment may be read as "at least one of a signal and a channel". Further, in the third embodiment, the "information used for the interference canceller" transmitted from the base station to the UE may be simply described as "information".

FIG. 4 is a diagram showing an example in which beams for other UEs interfere with each other. In the example shown in FIG. 4, the beam # 2 transmitted to the UE 2 also reaches the UE 1, and the UE # 1 is interfered with by the beam # 2. If the beam is not applied properly (eg, the beam is not perfectly orthogonal), interference between UEs will increase.

The base station transmits to the UE the information necessary for the interference canceller applied to RS to other UEs. The UE uses the information to cancel the RS interference with other UEs. The information used for the interference canceller may be information about RS for other UEs. For example, the information used for the interference canceller may include information indicating the resource of the RS.

The information required for the interference canceller is the transmission signal sequence number, cyclic shift index, time domain OCC index, frequency domain OCC index, etc. for the RS. The information indicating at least one of the information used for specifying the transmission signal sequence may be included. The information used for the interference canceller may include information indicating the number of ports in the transmission signal sequence, the antenna port number, the UE identifier (UE-ID (Identifier)), and RNTI (Radio Network Temporary Identifier).

The UE identifies the transmission signal sequence of another UE by using the above information transmitted from the base station, and cancels (subtracts) the transmission signal of the other UE from the received signal. Then, the UE may measure the RS (which may be called a desired signal) addressed to its own UE after the cancellation. Thereby, the RS measurement accuracy can be improved. The UE may receive information indicating the UE to be canceled from the base station. The UE may identify the UE to be canceled based on the notified information, and cancel the transmission signal for the UE to be canceled from the reception signal.

The base station may transmit the number of DMRS Code Division Multiplexing (CDM) groups (Number of DM-RS CDM groups without data) to the UE as information used for the interference canceller. The UE may cancel the interference based on the number of CDM groups of the DMRS without transmitted data. In addition, Rel. In the 15 specifications, the number of CDM groups for DMRS without data was specified for UL / DL data rate matching (clarification of the number of data bits), determination of DMRS Energy Per Resource Element (EPRE), etc. , The UE may assume that the number of CDM groups of DMRS without data thus identified by DCI is used for interference cancellation.

The UE identifies resources that do not contain data according to the number of CDM groups of DMRS without data. The UE may use a resource that does not contain data to estimate the interference of another UE and cancel the interference. For example, when the resource is a resource containing DMRS (for example, RE), the UE estimates interference by subtracting the DMRS information of its own UE (DMRS signal of its own UE) from the received signal of the resource. You may cancel. Further, for example, when the resource does not contain data (or nothing is sent), the UE may presume that the received signal of the resource is interference and use it for interference cancellation.

The UE may specify the resource containing the data according to the number of CDM groups of the DMRS without data. Then, the UE may estimate the interference of other UEs based on the identified resource and cancel the interference. Specifically, the UE demodulates and decodes the data, performs a cyclic redundancy check (Cyclic Redundancy Check (CRC)) check, and performs error determination / correction. Then, the UE generates a transmission signal replica and generates a transmission signal waveform / series replica. Then, the UE can estimate the interference by subtracting (cancelling) the generated transmission signal waveform / series replica from the received signal.

The UE may cancel the interference by using the DM-RS of another UE. Further, the UE may cancel the interference by using the CSI-RS of another UE. The CSI-RS of the other UE may correspond to the CSI-RS transmitted with the same beam (same QCL) as the DM-RS of the other UE. The UE may receive CSI-RS related information of other UEs by DCI.

Specifically, the UE receives at least one of the DMRS-related information of the other UE and the CSI-RS-related information of the other UE from the base station in the DCI, and cancels the interference using the received information. Do. The DMRS-related information received may include information that identifies resources, sequences, cyclic shifts, combs / FDM indexes (in other words, CDM groups), and the like. Further, the received CSI-RS related information may include, for example, information specifying resources, sequences, cyclic shifts, densities (for example, PRB level comb = {even, odd}) and the like. The UE may receive at least one of the DMRS-related information of the other UE and the CSI-RS-related information of the other UE in the upper layer / MAC CE. The UE receives DMRS-related information of other UEs and at least one of a plurality of candidates of CSI-RS-related information of other UEs in the upper layer / MAC CE, and receives information indicating which candidate is selected. It may be received by DCI.

(DMRS interference cancellation)
The UE may receive the information for identifying the DMRS resource and the transmission signal sequence, and cancel the DMRS based on the information.

The information for identifying the DMRS resource is set, for example, in the DMRS type of other UEs, the presence or absence of additional DMRS, the number of CDM groups of DMRS without data, the CDM group (comb index), the number of DMRS ports, and the upper layer. Parameters corresponding to the cell ID / scramble ID and the like may be included. For DMRS, when two scramble IDs are set, DCI may notify which value to use. The UE may receive the value of the scramble ID by the DCI that scheduled the PDSCH at the time of scheduling the PDSCH of its own UE. In this case, the UE may receive the value of the above-mentioned information identifying the DMRS resource such as the scramble ID by the new DCI field or the combination of the existing DCI fields.

Information for specifying the transmission signal sequence is, for example, DMRS sequence length (number of PDSCH allocated PRBs), sequence index, cyclic shift index, time domain OCC index (time domain OCC index), frequency domain OCC index (frequency domain OCC index). Etc. may be included.

(CSI-RS interference cancellation)
When canceling the interference of CSI-RS of another UE, the UE receives information for identifying the resource and transmission signal sequence of CSI-RS of another UE, and cancels the interference of CSI-RS based on the information. May be done.

The information that identifies the CSI-RS resources of other UEs is, for example, the CSI-RS type of CSI-RS of other UEs (for example, row index of the table such as the number of ports), and all PRBs are only even or odd PRBs. Information indicating whether or not it is, the number of CSI-RS ports, the time domain OCC index (time domain OCC index), the frequency domain OCC index (frequency domain OCC index), and the like.

The information that identifies the transmission signal sequence of another UE may include the CSI-RS sequence length (the number of PRBs allocated to CSI-RS), the parameters corresponding to the cell ID / scramble ID set in the upper layer, and the like. The information for specifying the transmission signal sequence of the other UE may be the information for specifying the value (c _init ) for initializing the data scramble.

The base station may determine the UE to be canceled by interference, and the UE may receive information indicating the determined UE to be canceled by interference. Further, the UE may determine the UE to be subject to interference cancellation. The processing in each case will be described below.

(1) When the base station determines another UE for interference cancellation The UE receives setting information indicating the RS resource to be measured by the other UE from the base station. Then, the UE measures the interference power of the RS resource shown in the setting information. The UE may transmit, for example, each of the interference powers measured for each RS resource to the base station. The UE may transmit, for example, a part of the measured interference power for each RS resource (for example, at least one of the maximum interference power and the minimum interference power) and the resource number of the measured RS resource to the base station. Further, the UE transmits the resource number of the RS resource, the UE index, etc. to the base station where the interference power satisfies a predetermined condition (for example, the interference power has the maximum interference power, the interference power is equal to or higher than a predetermined threshold value, etc.). May be good.

(2) When the UE determines another UE for interference cancellation The UE receives setting information indicating the RS resource to be measured by the other UE from the base station. Then, the UE measures the interference power of the RS resource shown in the setting information. The UE receives information on the correspondence between each RS resource and the information required for the interference canceller of each RS resource from the base station. The UE may cancel the interference based on the interference power measured for the RS resource.

<Fourth Embodiment>
(When receiving information about the precoder)
The UE receives information about a precoder (eg, a precoder for DL data) applied to the CSI-RS / DL channel of another UE. In this case, the UE was applied to the CSI-RS / DL channel of another UE based on DCI from a predetermined set of precoders (candidates) or a set of precoders notified by higher layer signaling. The precoder may be specified. When at least a part of the resources of the CSI-RS / DL channel of another UE overlaps, the UE uses the identified precoder to cancel the interference.

(If you do not receive information about the precoder)
If the UE does not receive information about the precoder applied to the CSI-RS / DL channel of another UE, it may receive configuration information indicating the precoded RS resource for the other UE. Then, the UE can estimate the precoder (precoding) for the CSI-RS / DL channel of another UE by measuring the RS resource indicated in the setting information.

The UE may be notified of the setting information indicating the precoded RS resource using the QCL-E. For example, a UE notified that an RS resource for another UE is a predetermined RS resource and a QCL-E has a precoder applied to the RS for the other UE applied to the predetermined RS resource. It may be assumed that it is the same as the precoder.

When at least a part of the resources of the CSI-RS / DL channel of another UE overlaps, the UE cancels the interference by using the estimated precoder for the other UE.

The UE may receive information on the data schedule of another UE, identify the resource for the CSI-RS / DL channel of the other UE based on the information, and use it for interference cancellation or the like.

The UE may receive data schedule information of other UEs (for example, information regarding resource allocation such as PDSCH and PUSCH) from the base station. For example, a new DCI format may be specified for notification of schedule information to other UEs. Further, the UE may determine whether the schedule information is addressed to the own UE or the schedule information addressed to another UE based on the bit field added to the existing DCI format.

The UE may be notified of the RNTI of another UE in a higher layer. Then, the UE may acquire schedule information to the other UE by blindly detecting (may be read by the monitor) DCI using the RNTI of the other UE that has been notified. When the number of blind detections exceeds a predetermined number, the UE may prioritize blind detection of DCI addressed to its own UE and drop some blind detection of DCI addressed to other UEs. The UE may perform blind detection of DCI on the assumption that the CORESET / search space between the own UE and another UE is equal.

The UE may be notified of the CORESET / search space information of another UE by upper layer signaling. When the CORESET / search space of the own UE and the CORESET / search space of another UE overlap (for example, the time frequency resources overlap), the UE gives priority to the CORESET / search space of the own UE and CORESET of the other UE. / DCI detection in the search space may be ignored / dropped (may not be performed).

According to the above-described embodiment, the UE appropriately processes the precoded signal / channel by executing processing on the signal / channel based on the information about the digitally precoded signal / channel. it can.

<Others>
The RS in the present disclosure includes CSI-RS, Tracking Reference Signal (TRS), Phase Tracking Reference Signal (PTRS), demodulation reference signal (DMRS), cell-specific reference signal (CRS), and synchronization signal. It is read as at least one of a block (Synchronization Signal Block (SSB)), a DMRS applied as an uplink reference signal (UL-RS), and a measurement reference signal (SRS). May be good.

Further, the CSI-RS in the present disclosure may be zero power CSI-RS (Zero-Power (ZP) CSI-RS) or non-zero power CSI-RS (Non-Zero-Power (NZP) CSI-RS). Good.

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

FIG. 5 is a diagram showing an example of a schematic configuration of a wireless communication system according to an 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 Third Generation Partnership Project (3GPP). ..

Further, the wireless communication system 1 may support dual connectivity between a plurality of Radio Access Technology (RAT) (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)), and dual connectivity between NR and LTE (NR-E). -UTRA Dual Connectivity (NE-DC)) may be included.

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

The wireless communication system 1 has dual connectivity between a plurality of base stations in 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.

The wireless communication system 1 includes a base station 11 that forms a macro cell C1 having a relatively wide coverage, and a base station 12 (12a-12c) that is arranged in the macro cell C1 and forms a small cell C2 that is narrower than the macro cell C1. You may prepare. The user terminal 20 may be located in at least one cell. The arrangement, number, and the like of each cell and the user terminal 20 are not limited to the mode shown in the figure. Hereinafter, when the base stations 11 and 12 are not distinguished, they are collectively referred to as the base station 10.

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

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

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

The plurality of base stations 10 may be connected by wire (for example, optical fiber compliant with 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 base stations 11 and 12, the base station 11 corresponding to the higher-level station is the Integrated Access Backhaul (IAB) donor, and the base station 12 corresponding to the relay station (relay) is the IAB. It may be called a node.

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

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

In the wireless communication system 1, a wireless access method based on Orthogonal Frequency Division Multiplexing (OFDM) may be used. For example, at least one of the downlink (Downlink (DL)) and the uplink (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.

The wireless access method may be called a waveform. In the wireless communication system 1, another wireless access system (for example, another single carrier transmission system, another multi-carrier transmission system) may be used as the UL and DL wireless access systems.

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

Further, in the wireless communication system 1, as the uplink channel, the uplink shared channel (Physical Uplink Shared Channel (PUSCH)), the uplink control channel (Physical Uplink Control Channel (PUCCH)), and the random access channel shared by each user terminal 20 are used. (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 PDSCH. User data, upper layer control information, and the like may be transmitted by the PUSCH. In addition, Master Information Block (MIB) may be transmitted by PBCH.

Lower layer control information may be transmitted by PDCCH. The lower layer control information may include, for example, downlink control information (Downlink Control Information (DCI)) including scheduling information of at least one of 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. The PDSCH may be read as DL data, and the PUSCH may be read as UL data.

A control resource set (COntrol REsource SET (CORESET)) and a search space (search space) may be used for detecting PDCCH. CORESET corresponds to a resource that searches for DCI. The search space corresponds to the search area and search method of PDCCH candidates (PDCCH candidates). One CORESET may be associated with one or more search spaces. The UE may monitor the CORESET associated with a search space 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. The "search space", "search space set", "search space setting", "search space set setting", "CORESET", "CORESET setting", etc. of the present disclosure may be read as each other.

Depending on the PUCCH, channel state information (Channel State Information (CSI)), delivery confirmation information (for example, it may be called Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK / NACK, etc.) and scheduling request (Scheduling Request ( Uplink Control Information (UCI) including at least one of SR)) may be transmitted. The PRACH may transmit a random access preamble for establishing a connection with the cell.

In this disclosure, downlinks, uplinks, etc. may be expressed without "links". Further, it may be expressed without adding "Physical" at the beginning of various channels.

In the wireless communication system 1, a synchronization signal (Synchronization Signal (SS)), a downlink reference signal (Downlink Reference Signal (DL-RS)), and the like may be transmitted. In the wireless communication system 1, the DL-RS includes a cell-specific reference signal (Cell-specific Reference Signal (CRS)), a channel state information reference signal (Channel State Information Reference Signal (CSI-RS)), and a demodulation reference signal (DeModulation). Reference Signal (DMRS)), positioning reference signal (Positioning Reference Signal (PRS)), phase tracking reference signal (Phase Tracking Reference Signal (PTRS)), and the like may be transmitted.

The synchronization signal may be, for example, at least one of a primary synchronization signal (Primary Synchronization Signal (PSS)) and a secondary synchronization signal (Secondary Synchronization Signal (SSS)). The signal block including SS (PSS, SSS) and PBCH (and DMRS for PBCH) may be referred to as SS / PBCH block, SS Block (SSB) and the like. In addition, SS, SSB and the like may also be called a reference signal.

Further, in the wireless communication system 1, even if a measurement reference signal (Sounding Reference Signal (SRS)), a demodulation reference signal (DMRS), or the like is transmitted as an uplink reference signal (Uplink Reference Signal (UL-RS)). Good. The DMRS may be called a user terminal specific reference signal (UE-specific Reference Signal).

(base station)
FIG. 6 is a diagram showing an example of the configuration of the base station according to the embodiment. The base station 10 includes a control unit 110, a transmission / reception unit 120, a transmission / reception antenna 130, and a transmission line interface 140. The control unit 110, the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission line interface 140 may each be provided with one or more.

Note that, in this example, the functional blocks of the feature portion in the present embodiment are mainly shown, 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 part described below may be omitted.

The control unit 110 controls the entire base station 10. The control unit 110 can be composed of a controller, a control circuit, and the like described based on the 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, and the like 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, and the like, and transfer the data to the transmission / reception unit 120. The control unit 110 may perform call processing (setting, release, etc.) of the communication channel, state management of the base station 10, management of radio resources, and the like.

The transmission / reception unit 120 may include a baseband unit 121, a Radio Frequency (RF) unit 122, and a measurement unit 123. The baseband unit 121 may include a transmission processing unit 1211 and a reception processing unit 1212. The transmitter / receiver 120 includes a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmitter / receiver circuit, and the like, which are described based on common recognition in the technical fields 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 composed of a transmission unit and a reception unit. The transmission unit may be composed of a transmission processing unit 1211 and an RF unit 122. The receiving unit may be composed of a receiving processing unit 1212, an RF unit 122, and a measuring unit 123.

The transmitting / receiving antenna 130 can be composed of an antenna described based on common recognition in the technical field according to the present disclosure, for example, an array antenna.

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

The transmission / reception unit 120 may form at least one of a transmission beam and a reception beam by using digital beamforming (for example, precoding), analog beamforming (for example, phase rotation), and the like.

The transmission / reception unit 120 (transmission processing unit 1211) processes, for example, Packet Data Convergence Protocol (PDCP) layer processing and Radio Link Control (RLC) layer processing (for example, RLC) for data, control information, etc. acquired from control unit 110. 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 (may include error correction coding), modulation, mapping, filtering, and discrete Fourier transform (Discrete Fourier Transform (DFT)) for the bit string to be transmitted. The base band signal may be output by performing processing (if necessary), inverse fast Fourier transform (IFFT) processing, precoding, digital-analog conversion, and other transmission processing.

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

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

The transmission / reception unit 120 (reception processing unit 1212) performs analog-digital conversion, fast Fourier transform (FFT) processing, and inverse discrete Fourier transform (IDFT) on the acquired baseband signal. )) Processing (if necessary), filtering, demapping, demodulation, decoding (may include error correction decoding), MAC layer processing, RLC layer processing, PDCP layer processing, and other reception processing are applied. User data and the like may be acquired.

The transmission / reception unit 120 (measurement unit 123) may perform measurement on the received signal. For example, the measurement unit 123 may perform Radio Resource Management (RRM) measurement, Channel State Information (CSI) measurement, or the like based on the received signal. The measuring unit 123 has received power (for example, Reference Signal Received Power (RSRP)) and 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)), propagation path information (for example, CSI), and the like may be measured. The measurement result may be output to the control unit 110.

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

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

Note that the transmission / reception unit 120 may transmit information related to at least one of the digitally precoded signal and the channel to the UE. Note that "notification" may be read as "instruction", "setting", and "sending". The relevant information may be information regarding the application of digital precoding to at least one of a signal and a channel. Also, the relevant information is whether each precoding applied to multiple signals is equal, each precoding applied to multiple channels is equal, or each precoding applied to signals and channels is It may include information about the QCL indicating whether they are equal. In addition, the related information may include information used for an interference canceller applied to at least one of a signal and a channel to another UE (a UE other than the UE to which the information is transmitted). The relevant information may also include information about digital precoding applied to at least one of a signal and a channel to another UE (a UE other than the UE to which the information is transmitted).

The control unit 110 may digitally precode at least one of the signal and the channel to generate the above-mentioned related information transmitted by the transmission / reception unit 120 to the UE.

(User terminal)
FIG. 7 is a diagram showing an example of the configuration of the user terminal according to the embodiment. The user terminal 20 includes a control unit 210, a transmission / reception unit 220, and a transmission / reception antenna 230. The control unit 210, the transmission / reception unit 220, and the transmission / reception antenna 230 may each be provided with one or more.

Note that this example mainly shows the functional blocks of the feature portion in 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 part described below may be omitted.

The control unit 210 controls the entire user terminal 20. The control unit 210 can be composed of a controller, a control circuit, and the like described based on the 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, and the like using the transmission / reception unit 220 and the transmission / reception antenna 230. The control unit 210 may generate data to be transmitted as a signal, control information, a sequence, and the like, and transfer the data to the transmission / reception unit 220.

The transmission / reception unit 220 may include a baseband unit 221 and an RF unit 222, and a measurement unit 223. The baseband unit 221 may include a transmission processing unit 2211 and a reception processing unit 2212. The transmitter / receiver 220 can be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmitter / receiver circuit, and the like, which are described based on the 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 composed of a transmission unit and a reception unit. The transmission unit may be composed of a transmission processing unit 2211 and an RF unit 222. The receiving unit may be composed of a receiving processing unit 2212, an RF unit 222, and a measuring unit 223.

The transmitting / receiving antenna 230 can be composed of an antenna described based on common recognition in the technical field according to the present disclosure, for example, an array antenna.

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

The transmission / reception unit 220 may form at least one of a transmission beam and a reception beam by using digital beamforming (for example, precoding), analog beamforming (for example, phase rotation), and the like.

The transmission / reception unit 220 (transmission processing unit 2211) processes, for example, PDCP layer processing, RLC layer processing (for example, RLC retransmission control), and MAC layer processing (for example, for data, control information, etc. acquired from the control unit 210). , HARQ retransmission control), etc., to generate a bit string to be transmitted.

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

Whether or not to apply the DFT process may be based on the transform precoding setting. The transmission / reception unit 220 (transmission processing unit 2211) described above for transmitting a channel (for example, PUSCH) using the DFT-s-OFDM waveform when the transform precoding is enabled. The DFT process may be performed as the transmission process, and if not, the DFT process may not be performed as the transmission process.

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

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

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

The transmission / reception unit 220 (measurement unit 223) may perform measurement on the received signal. For example, the measuring unit 223 may perform RRM measurement, CSI measurement, or the like based on the received signal. The measuring unit 223 may measure received power (for example, RSRP), reception quality (for example, RSRQ, SINR, SNR), signal strength (for example, RSSI), propagation path information (for example, CSI), and the like. The measurement result may be output to the control unit 210.

The transmitter and receiver of the user terminal 20 in the present disclosure may be composed of at least one of the transmitter / receiver 220 and the transmitter / receiver antenna 230.

Note that the transmitter / receiver 220 may receive information related to at least one of the digitally precoded signal and channel. The related information may be information regarding the application of digital precoding to at least one of a signal and a channel. Also, the relevant information is whether each precoding applied to multiple signals is equal, each precoding applied to multiple channels is equal, or each precoding applied to signals and channels is It may include information about the QCL indicating whether they are equal. In addition, the related information may include information used for an interference canceller applied to at least one of a signal and a channel to another UE. The relevant information may also include information about digital precoding applied to at least one of the signals and channels to other UEs.

The control unit 210 may execute processing for at least one of the signal and the channel based on the above-mentioned related information received by the transmission / reception unit 220. The control unit 210 may cancel the interference based on the related information received by the transmission / reception unit 220, for example.

(Hardware configuration)
The block diagram used in the description of the above embodiment shows a block of functional units. These functional blocks (components) are realized by any combination of at least one of hardware and software. Further, the method of realizing each functional block is not particularly limited. That is, each functional block may be realized by using one device that is physically or logically connected, or directly or indirectly (for example, by using two or more physically or logically separated devices). , Wired, wireless, etc.) and may be realized using these plurality of devices. The functional block may be realized by combining the software with the one device or the plurality of devices.

Here, the functions include judgment, decision, judgment, calculation, calculation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, solution, selection, selection, establishment, comparison, assumption, expectation, and deemed. , Broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc. Not limited. For example, a functional block (constituent unit) that functions transmission may be referred to as a transmitting unit (transmitting unit), a transmitter (transmitter), or the like. As described above, the method of realizing each of them is not particularly limited.

For example, the base station, user terminal, and the like in one embodiment of the present disclosure may function as a computer that processes the wireless communication method of the present disclosure. FIG. d is a diagram showing an example of the hardware configuration of the base station and the user terminal according to the embodiment. The base station 10 and the 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 this disclosure, the terms of devices, circuits, devices, sections, units, etc. can be read as each other. The hardware configuration of the base station 10 and the user terminal 20 may be configured to include one or more of the devices shown in the figure, or may be configured not to include some of the devices.

For example, although only one processor 1001 is shown, there may be a plurality of processors. Further, the processing may be executed by one processor, or the processing may be executed simultaneously, sequentially, or by using other methods by two or more processors. The processor 1001 may be mounted by one or more chips.

For each function of the base station 10 and the user terminal 20, for example, by loading predetermined software (program) on hardware such as the processor 1001 and the memory 1002, the processor 1001 performs an operation and communicates via the communication device 1004. It is realized by controlling at least one of reading and writing of data in the memory 1002 and the storage 1003.

The processor 1001 operates, for example, an operating system to control 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 unit, registers, and the like. For example, at least a part of the above-mentioned control unit 110 (210), transmission / reception unit 120 (220), and the like may be realized by the processor 1001.

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

The memory 1002 is a computer-readable recording medium, for example, at least a Read Only Memory (ROM), an Erasable Programmable ROM (EPROM), an Electrically EPROM (EPROM), a Random Access Memory (RAM), or any other suitable storage medium. It may be composed of one. The memory 1002 may be referred to as a register, a cache, a main memory (main storage device), or the like. The memory 1002 can store a program (program code), a software module, or the like that can be executed to implement the wireless communication method according to the embodiment of the present disclosure.

The storage 1003 is a computer-readable recording medium, for example, a flexible disk, a floppy (registered trademark) disk, an optical magnetic disk (for example, a compact disc (Compact Disc ROM (CD-ROM)), a digital versatile disk, etc.). At least one of Blu-ray® disks, removable disks, hard disk drives, smart cards, flash memory devices (eg cards, sticks, key drives), magnetic stripes, databases, servers, and other suitable storage media. It may be composed of. The storage 1003 may be referred to as an auxiliary storage device.

The communication device 1004 is hardware (transmission / reception device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, a communication module, or the like. The communication device 1004 includes, for example, a high frequency switch, a duplexer, a filter, a frequency synthesizer, etc. in order to realize at least one of frequency division duplex (Frequency Division Duplex (FDD)) and time division duplex (Time Division Duplex (TDD)). It may be configured to include. For example, the transmission / reception unit 120 (220), the transmission / reception antenna 130 (230), and the like described above may be realized by the communication device 1004. The transmission / reception unit 120 (220) may be physically or logically separated from the transmission unit 120a (220a) and the reception unit 120b (220b).

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

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

Further, the base station 10 and the user terminal 20 include a microprocessor, a digital signal processor (Digital Signal Processor (DSP)), an Application Specific Integrated Circuit (ASIC), a Programmable Logic Device (PLD), a Field Programmable Gate Array (FPGA), and the like. It may be configured to include hardware, and a part or all of each functional block may be realized by using the hardware. For example, processor 1001 may be implemented using at least one of these hardware.

(Modification example)
The terms described in the present disclosure and the terms necessary for understanding the present disclosure may be replaced with terms having the same or similar meanings. For example, channels, symbols and signals (signals or signaling) may be read interchangeably. Also, the signal may be a message. The reference signal can also be abbreviated as RS, and may be called a pilot, a pilot signal, or the like depending on the applied standard. Further, the component carrier (Component Carrier (CC)) may be referred to as a cell, a frequency carrier, a carrier frequency or the like.

The wireless frame may be composed of one or more periods (frames) in the time domain. Each of the one or more periods (frames) constituting the wireless frame may be referred to as a subframe. Further, the subframe may be composed of one or more slots in the time domain. The subframe may have a fixed time length (eg, 1 ms) that is independent of numerology.

Here, the numerology may be a communication parameter applied to at least one of transmission and reception of a signal or channel. Pneumerology includes, for example, subcarrier spacing (SubCarrier Spacing (SCS)), bandwidth, symbol length, cyclic prefix length, transmission time interval (Transmission Time Interval (TTI)), number of symbols per TTI, and wireless frame configuration. , A specific filtering process performed by the transmitter / receiver in the frequency domain, a specific windowing process performed by the transmitter / receiver in the time domain, and the like may be indicated.

The slot may be composed of one or more symbols in the time domain (Orthogonal Frequency Division Multiple Access (OFDMA) symbol, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol, etc.). Further, the slot may be a time unit based on numerology.

The slot may include a plurality of mini slots. Each minislot may consist of one or more symbols in the time domain. Further, the mini slot may be called a sub slot. A minislot may consist of a smaller number of symbols than the slot. A PDSCH (or PUSCH) transmitted in time units larger than the minislot may be referred to as a PDSCH (PUSCH) mapping type A. The PDSCH (or PUSCH) transmitted using the minislot may be referred to as PDSCH (PUSCH) mapping type B.

The wireless frame, subframe, slot, mini slot and symbol all represent the time unit when transmitting a signal. The radio frame, subframe, slot, minislot and symbol may have different names corresponding to each. The time units such as frames, subframes, slots, mini slots, and symbols in the present disclosure may be read as each other.

For example, one subframe may be called TTI, a plurality of consecutive subframes may be called TTI, and one slot or one minislot may be called 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. It may be. The unit representing TTI may be called a slot, a mini slot, or the like instead of a subframe.

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

The TTI may be a transmission time unit such as a channel-encoded data packet (transport block), a code block, or a code word, or may be a processing unit such as scheduling or link adaptation. When a TTI is given, the time interval (for example, the number of symbols) to which the transport block, code block, code word, etc. are actually mapped may be shorter than the TTI.

When one slot or one mini slot is called TTI, one or more TTIs (that is, one or more slots or one or more mini slots) may be the minimum time unit for scheduling. Further, the number of slots (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 referred to as a normal TTI (TTI in 3GPP Rel. 8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, a long subframe, a slot, or the like. TTIs shorter than normal TTIs may be referred to as shortened TTIs, short TTIs, partial TTIs (partial or fractional TTIs), shortened subframes, short subframes, minislots, subslots, slots, and the like.

The long TTI (for example, normal TTI, subframe, etc.) may be read as a TTI having a time length of more than 1 ms, and the short TTI (for example, shortened TTI, etc.) is less than the TTI length of the long TTI and 1 ms. It may be read as a TTI having the above TTI length.

A resource block (Resource Block (RB)) is a resource allocation unit in the time domain and the frequency domain, and may include one or a plurality of continuous subcarriers in the frequency domain. The number of subcarriers contained in the RB may be the same regardless of the numerology, and may be, for example, 12. The number of subcarriers contained in the RB may be determined based on numerology.

Further, the RB may include one or more symbols in the time domain, and may have a length of 1 slot, 1 mini slot, 1 subframe or 1 TTI. Each 1TTI, 1 subframe, etc. may be composed of one or a plurality of resource blocks.

One or more RBs are a physical resource block (Physical RB (PRB)), a sub-carrier group (Sub-Carrier Group (SCG)), a resource element group (Resource Element Group (REG)), a PRB pair, and an RB. It may be called a pair or the like.

Further, the resource block may be composed of one or a plurality of resource elements (Resource Element (RE)). For example, 1RE may be a radio resource area of 1 subcarrier and 1 symbol.

Bandwidth Part (BWP) (which may also be called partial bandwidth, etc.) represents a subset of consecutive common resource blocks (RBs) for a neurology in a carrier. May be good. Here, the common RB may be specified by the index of the RB with respect to the common reference point of the carrier. PRBs may be defined in a BWP and numbered within that BWP.

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

At least one of the configured BWPs may be active, and the UE may not expect to send or receive a given signal / channel outside the active BWP. In addition, "cell", "carrier" and the like in this disclosure may be read as "BWP".

Note that the above-mentioned structures such as wireless frames, subframes, slots, mini slots, and symbols are merely examples. For example, the number of subframes contained in a wireless frame, the number of slots per subframe or wireless frame, the number of minislots contained within a slot, the number of symbols and RBs contained in a slot or minislot, included in the RB. The number of subcarriers, the number of symbols in the TTI, the symbol length, the cyclic prefix (CP) length, and other configurations can be changed in various ways.

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

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

The information, signals, etc. described in this disclosure may be represented using any of a variety of different techniques. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description are voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any of these. It may be represented by a combination of.

In addition, information, signals, etc. can be output from the upper layer to the lower layer and from the lower layer to at least one of the upper layers. Information, signals, etc. may be input / output via a plurality of network nodes.

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

The notification of information is not limited to the mode / embodiment described in the present disclosure, and may be performed by using another method. For example, the notification of information in the present disclosure includes physical layer signaling (for example, downlink control information (DCI)), uplink control information (Uplink Control Information (UCI))), and higher layer signaling (for example, 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 carried out by.

Note that the physical layer signaling may be referred to as Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signal), L1 control information (L1 control signal), and the like. Further, the RRC signaling may be called an RRC message, and may be, for example, an RRC connection setup (RRC Connection Setup) message, an RRC connection reconfiguration (RRC Connection Reconfiguration) message, or the like. Further, MAC signaling may be notified using, for example, a MAC control element (MAC Control Element (CE)).

In addition, the notification of predetermined information (for example, the notification of "being X") is not limited to the explicit notification, but implicitly (for example, by not notifying the predetermined information or another information). May be done (by notification of).

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

Software is an instruction, instruction set, code, code segment, program code, program, subprogram, software module, whether called software, firmware, middleware, microcode, hardware description language, or another name. , Applications, software applications, software packages, routines, subroutines, objects, executables, execution threads, procedures, features, etc. should be broadly interpreted to mean.

In addition, software, instructions, information, etc. may be transmitted and received via a transmission medium. For example, a website where software uses at least one of wired technology (coaxial cable, fiber optic cable, twist pair, digital subscriber line (DSL), etc.) and wireless technology (infrared, microwave, etc.). When transmitted from a server, or other remote source, at least one of these wired and wireless technologies is included within the definition of transmission medium.

The terms "system" and "network" used in this disclosure may be used interchangeably. "Network" may mean a device (eg, a base station) included in the network.

In the present disclosure, "precoding", "precoder", "weight (precoding weight)", "pseudo-colocation (Quasi-Co-Location (QCL))", "Transmission Configuration Indication state (TCI state)", "space". "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 compatible. Can be used for

In the present disclosure, "base station (BS)", "radio base station", "fixed station", "NodeB", "eNB (eNodeB)", "gNB (gNodeB)", "Access point", "Transmission point (Transmission Point (TP))", "Reception point (Reception Point (RP))", "Transmission / reception point (Transmission / Reception Point (TRP))", "Panel" , "Cell", "sector", "cell group", "carrier", "component carrier" and the like can be used interchangeably. Base stations are sometimes referred to by terms such as macrocells, small cells, femtocells, and picocells.

The base station can accommodate one or more (for example, three) cells. When a base station accommodates multiple cells, the entire coverage area of the base station can be divided into multiple smaller areas, each smaller area being a base station subsystem (eg, a small indoor base station (Remote Radio)). Communication services can also be provided by Head (RRH))). The term "cell" or "sector" refers to part or all of the coverage area of at least one of the base stations and base station subsystems that provide communication services in this coverage.

In this disclosure, terms such as "mobile station (MS)", "user terminal", "user equipment (UE)", and "terminal" are used interchangeably. Can be done.

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. , Handset, user agent, mobile client, 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 the mobile body, the mobile body itself, or the like. The moving body may be a vehicle (eg, car, airplane, etc.), an unmanned moving body (eg, drone, self-driving car, etc.), or a robot (manned or unmanned). ) May be. It should be noted that at least one of the base station and the mobile station includes a device that does not necessarily move during communication operation. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

Further, the base station in the present disclosure may be read by the user terminal. For example, communication between a base station and a user terminal is replaced with communication between a plurality of user terminals (for example, it may be called Device-to-Device (D2D), Vehicle-to-Everything (V2X), etc.). Each aspect / embodiment of the present disclosure may be applied to the configuration. In this case, the user terminal 20 may have the function of the base station 10 described above. In addition, words such as "up" and "down" may be read as words corresponding to communication between terminals (for example, "side"). For example, the uplink, downlink, and the like may be read as side channels.

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

In the present disclosure, the operation performed by the base station may be performed by its upper node (upper node) in some cases. In a network including one or more network nodes having a base station, various operations performed for communication with a terminal are performed by the base station and one or more network nodes other than the base station (for example,). Mobility Management Entity (MME), Serving-Gateway (S-GW), etc. can be considered, but it is not limited to these), or it is clear that it can be performed by a combination thereof.

Each aspect / embodiment described in the present disclosure may be used alone, in combination, or switched with execution. In addition, the order of the processing procedures, sequences, flowcharts, etc. of each aspect / embodiment described in the present disclosure may be changed as long as there is no contradiction. For example, the methods described in the present disclosure present elements of various steps using exemplary order, and are not limited to the particular order presented.

Each aspect / embodiment described in the present 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), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), LTE 802. 20, Ultra-WideBand (UWB), Bluetooth®, other systems that utilize suitable wireless communication methods, next-generation systems extended based on these, and the like. In addition, a plurality of systems may be applied in combination (for example, a combination of LTE or LTE-A and 5G).

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

Any reference to elements using designations such as "first", "second", etc. as used in this disclosure does not generally limit the quantity or order of those elements. These designations can be used in the present disclosure as a convenient way to distinguish between two or more elements. Thus, references to the first and second elements do not mean that only two elements can be adopted or that the first element must somehow precede the second element.

The term "determining" used in this disclosure may include a wide variety of actions. For example, "judgment (decision)" means judgment (judging), calculation (calculating), calculation (computing), processing (processing), derivation (deriving), investigation (investigating), search (looking up, search, inquiry) ( For example, searching in a table, database or another data structure), ascertaining, etc. may be considered to be "judgment".

In addition, "judgment (decision)" means receiving (for example, receiving information), transmitting (for example, transmitting information), input (input), output (output), access (for example). It may be regarded as "judgment (decision)" of "accessing" (for example, accessing data in memory).

In addition, "judgment (decision)" is regarded as "judgment (decision)" of solving, selecting, choosing, establishing, comparing, and the like. May be good. That is, "judgment (decision)" may be regarded as "judgment (decision)" of some action.

In addition, "judgment (decision)" may be read as "assuming", "expecting", "considering", and the like.

The terms "connected", "coupled", or any variation thereof, as used herein, are any direct or indirect connection or connection between two or more elements. Means, and can include the presence of one or more intermediate elements between two elements that are "connected" or "joined" to each other. The connection or connection between the elements may be physical, logical, or a combination thereof. For example, "connection" may be read as "access".

In the present disclosure, when two elements are connected, using one or more wires, cables, printed electrical connections, etc., and as some non-limiting and non-comprehensive examples, the radio frequency domain, microwaves. It can be considered to be "connected" or "coupled" to each other using frequency, electromagnetic energy having wavelengths in the light (both visible and invisible) regions, 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 mean that "A and B are different from C". Terms such as "separate" and "combined" may be interpreted in the same way as "different".

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

In the present disclosure, if articles are added by translation, for example, a, an and the in English, the disclosure may include that the nouns following these articles are in the plural.

Although the invention according to the present disclosure has been described in detail above, it is clear 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 a modified or modified mode 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 purposes of illustration and does not bring any limiting meaning to the invention according to the present disclosure.

Claims

A receiver that receives relevant information on at least one of a digitally precoded signal and channel,
A terminal comprising a control unit that executes processing for at least one of the signal and the channel based on the related information.
The terminal according to claim 1, wherein the related information includes information regarding application of digital precoding to at least one of the signal and the channel.
The relevant information is whether each precoding applied to multiple signals is equal, each precoding applied to multiple channels is equal, or each precoding applied to signals and channels is equal. The terminal according to claim 1 or 2, wherein the terminal includes information on a pseudo collocation (Quasi-Co-Location (QCL)) indicating whether or not.
The terminal according to any one of claims 1 to 3, wherein the related information includes information used for an interference canceller applied to at least one of a signal and a channel to another terminal.
The terminal according to any one of claims 1 to 4, wherein the related information includes information regarding digital precoding applied to at least one of a signal and a channel for another terminal.
The step of receiving the relevant information of at least one of the digitally precoded signals and channels,
A method of wireless communication of a terminal, comprising: a step of performing processing on at least one of the signals and channels based on the relevant information.