阅读说明：本技术 用户终端以及无线通信方法 (User terminal and wireless communication method ) 是由 吉冈翔平 松村祐辉 村山大辅 永田聪 于 2019-04-18 设计创作，主要内容包括：本公开的一方式所涉及的用户终端的特征在于,具有：控制单元,导出与基站或其他用户终端的距离；以及发送单元,发送和所述距离相关的信息。根据本公开的个方式,即使在得不到完整的信道信息的情况下,也能够适当地利用MIMO。(A user terminal according to an aspect of the present disclosure includes: a control unit for deriving the distance to the base station or other user terminals; and a transmitting unit that transmits information related to the distance. According to the aspects of the present disclosure, MIMO can be appropriately utilized even when complete channel information is not obtained.)

1. A user terminal, comprising:

a control unit for deriving the distance to the base station or other user terminals; and

and a transmitting unit that transmits information related to the distance.

2. The user terminal of claim 1,

the transmitting unit transmits information for identifying the base station or the other user terminal corresponding to the information related to the distance.

3. The user terminal of claim 1 or claim 2,

the control unit determines whether to transmit specific channel state information based on the distance.

4. The user terminal according to any of claims 1 to 3,

the control unit performs correction of a beam used for transmission or reception based on the distance.

5. The user terminal of claim 4,

the control unit corrects the beam based on beam angle information that is output by inputting the granularity information of the beam change of the user terminal to an estimation model generated based on the granularity information of the beam change and an actual measurement value of the beam angle information.

6. A wireless communication method of a user terminal, comprising:

deriving a distance to a base station or other user terminal; and

and transmitting information related to the distance.

Technical Field

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

Background

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

Successor systems to LTE (e.g., also referred to as a 5th generation mobile communication system (5G)), 5G + (plus), New Radio (NR), 3GPP rel.15 and beyond) are also being studied.

Documents of the prior art

Non-patent document

Non-patent document 1: 3GPP TS 36.300V8.12.0 "Evolved Universal Radio Access (E-UTRA) and Evolved Universal Radio Access Network (E-UTRAN); (ii) an Overall description; stage 2(Release 8) ", 4 months 2010

Disclosure of Invention

Problems to be solved by the invention

In NR, MIMO in which spatial multiplexing of Multiple Input Multiple Output (MIMO) introduced in LTE is further expanded is studied to improve communication throughput.

For spatial separation of MIMO, it is preferable to obtain information of the complete channel (eventually, information of amplitude and phase of all signals). However, in order to feed back information of the complete channel, resources are required accordingly, and thus communication throughput is reduced.

Therefore, a method is being sought that enables a sufficient and efficient use of the spatial domain (MIMO) even when the required channel information is not sufficiently obtained. However, such methods have not been studied.

Therefore, an object of the present disclosure is to provide a user terminal and a wireless communication method capable of appropriately using MIMO even when complete channel information is not obtained.

Means for solving the problems

A user terminal according to an aspect of the present disclosure includes: a control unit for deriving the distance to the base station or other user terminals; and a transmitting unit that transmits information related to the distance.

Effects of the invention

According to an aspect of the present disclosure, MIMO can be appropriately utilized even in a case where complete channel information is not obtained.

Drawings

Fig. 1 is a diagram showing an example of a distance report according to the first embodiment.

Fig. 2A to 2D are diagrams showing an example of the positional relationship of the UE.

Fig. 3A and 3B are diagrams illustrating an example of CSI reports or distance reports according to the second embodiment.

Fig. 4A and 4B are diagrams illustrating an example of beam correction of the UE according to the third embodiment.

Fig. 5 is a diagram showing an example of a schematic configuration of a radio communication system according to an embodiment.

Fig. 6 is a diagram showing an example of the configuration of a base station according to an embodiment.

Fig. 7 is a diagram showing an example of a configuration of a user terminal according to an embodiment.

Fig. 8 is a diagram showing an example of hardware configurations of a base station and a user terminal according to an embodiment.

Detailed Description

In NR, MIMO in which spatial multiplexing of Multiple Input Multiple Output (MIMO) introduced in LTE is further expanded is studied to improve communication throughput.

MIMO is greatly affected by spatial correlation. For example, in Single User (SU) -MIMO, if the channel correlation between antennas in one UE is high, signal separation cannot be performed. In addition, in Multi-User (MU) -MIMO, if the channel correlation between a plurality of UEs is high, signal separation cannot be performed.

The UE performs Channel measurement, interference measurement, and the like, and reports the result to the network as Channel State Information (CSI). The CSI may include, for example, a Channel Quality Indicator (CQI), a Precoding Matrix Indicator (PMI), a Rank Indicator (RI), and the like.

For spatial separation of MIMO, it is preferable to obtain information of the complete channel (eventually, information of amplitude and phase of all signals). However, in order to feed back detailed channel information, resources are required accordingly, and thus communication throughput is reduced.

Therefore, a method is being sought that can sufficiently utilize the spatial region (MIMO) even when necessary channel information is not sufficiently obtained. However, such methods have not been studied.

Therefore, the present inventors have conceived a method that can improve the performance of MIMO spatial separation even when limited feedback information is obtained. According to an aspect of the present disclosure, it is assumed that inter-gbb-UE, inter-UE, and the like are related to a channel, and an operation associated with MIMO is controlled (applied/switched) based on distance information between the gbb-UE, inter-UE, and the like.

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

In the present disclosure, "distance" may also be replaced with at least one of "UE-to-base station distance" (e.g., "own UE-to-base station distance") and "UE-to-UE distance" (e.g., "own UE-to-other UE distance").

In the following embodiments, it is assumed that the UE measures or estimates the distance to at least one of the base station and the other UEs based on the specific distance measurement signal transmitted from the base station and the other UEs, but the present invention is not limited to this. The UE may acquire and derive the distance by any method. In addition, the distance measurement signal of the present disclosure may be replaced with at least one of a measurement signal, a reference signal, a channel, a synchronization signal, and the like.

(Wireless communication method)

< first embodiment >

A first embodiment relates to reporting of distance.

The UE may also send information related to distance (also referred to as a distance report) to the network (e.g., a base station). The report may be a periodic report (periodic report), a semi-persistent report (semi-persistent report), or an aperiodic report (aperiodic report). These reports may also be referred to as periodic distance reports, semi-continuous distance reports, and aperiodic distance reports, respectively.

The UE may also receive setting information for distance reporting through higher layer signaling. For example, the setting information may include information such as timing of distance reporting (for example, which of periodic reporting, semi-persistent reporting, and aperiodic reporting is used), and resources for distance reporting (for example, time resources (such as a period) and frequency resources).

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

For example, a MAC Control Element (MAC CE), a MAC Protocol Data Unit (PDU), or the like may be used for the MAC signaling. The broadcast Information may be, for example, a Master Information Block (MIB), a System Information Block (SIB), Minimum System Information (Remaining Minimum System Information (RMSI)), Other System Information (OSI)), or the like.

The UE to which the periodic distance report is set may transmit the distance report at a specific period (e.g., a period indicated by a higher layer parameter, a period specified by a specification).

The UE to which the semi-persistent distance report is set may control whether to perform the distance report of a specific period (e.g., a period represented by a higher layer parameter, a period specified by a specification) based on an activation (activation) signal from the network.

The UE to which the aperiodic distance report is set may transmit the distance report when a trigger signal (request signal) from the network is triggered.

Here, the activation signal, the trigger signal, and the like may be MAC CE, Downlink Control Information (DCI)), or a combination thereof.

The setting information for distance reporting, the activation signal, the trigger signal, and the like may include information for specifying a measurement target. The UE may also transmit a distance report including the distance associated with the specified measurement object. For example, as the measurement target, a specific base station, a specific UE, a base station satisfying a specific condition among all base stations, a UE satisfying a specific condition among all UEs, or the like can be specified.

The UE satisfying the specific condition may be a UE that has transmitted a specific distance measurement signal.

The UE may transmit the distance report using a Channel for distance reporting, or may transmit the distance report using an existing Channel (e.g., an Uplink Shared Channel (Physical Uplink Shared Channel (PUSCH))), an Uplink Control Channel (Physical Uplink Control Channel (PUCCH))), a Random Access Channel (Physical Random Access Channel (PRACH))), or the like).

The range report may also include information related to the range of the UE from at least one of a base station (e.g., a gNB) and another UE. The distance may be a measured distance or an indicator obtained based on the measured distance.

The indicator may be, for example, a parameter indicating whether or not at least one of a base station and another UE is present within a specific distance, or may be a level of distance (e.g., near, medium, and far) from the measurement object. The correspondence between the rank and the distance may be set to the UE by higher layer signaling or may be specified by a specification.

In addition, the distance report may also contain information (e.g., a user Identifier (UE Identifier (ID)))) for determining (identifying) the own UE. The UE ID may be a specific Radio Network Temporary Identifier (RNTI), or may be, for example, a Cell RNTI (C-RNTI)).

A distance report containing information relating to the distance to another UE may also contain information (e.g., a UE ID) for determining the other UE.

The UE may transmit the distance report at the same timing as Uplink Control Information (UCI), may report as one of the UCIs (e.g., CSI), or may report at a timing different from (independently of) the UCI. The UCI of the present disclosure may mean at least one of transmission ACKnowledgement Information (e.g., Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK)), a Scheduling ReQuest (SR), and Channel State Information (CSI)).

Fig. 1 is a diagram showing an example of a distance report according to the first embodiment. In this example, the UE measures the distance between the UE and another UE (UE of UE ID # a) based on (the resource of) the distance measurement signal transmitted from the another UE. The UE transmits a distance report including information on the measured distance and the ID (UE ID # a) of the other UE to the base station.

The base station may also calculate the location relationship of the UE based on the reported range information. The base station may calculate an angle (an angle formed by line segments connecting the base station and the plurality of UEs) with respect to the plurality of UEs as viewed from the base station, for example.

The base station may decide or correct a MIMO precoder (e.g., at least one of a digital beam and an analog beam) and may also perform scheduling of the UE (e.g., pairing of users to which MU-MIMO is applied, selection of users to which SU-MIMO is applied) based on the calculated positional relationship of the UE.

Fig. 2A to 2D are diagrams showing an example of the positional relationship of the UE.

In fig. 2A, the distance between the UE and the base station is short, and the distance between the UE and another UE is also short. The base station may apply SU-MIMO to the UE when grasping the positional relationship as shown in fig. 2A based on the distance report from the UE. This is because the distance between UEs is short, and signal separation between UEs cannot be performed appropriately.

In fig. 2B, the distance between the UE and the base station is far, and the distance between the UE and other UEs is close. When the base station grasps the positional relationship as shown in fig. 2B based on the distance report from the UE, the base station may perform control not to apply MU-MIMO to the UE and the other UEs. This is because the distance between UEs is short, and signal separation between UEs cannot be performed appropriately.

In fig. 2C, the UE is close or medium to the base station, and the UE is far from other UEs. The base station may apply MU-MIMO to the UE and the other UEs when grasping the positional relationship as shown in fig. 2C based on the distance report from the UE. This is because the distance between UEs is long, and signal separation between UEs can be performed appropriately.

In fig. 2D, the distance between the UE and the base station is long, and the distance between the UE and other UEs is also long.

The base station may apply MU-MIMO to the UE and the other UEs when grasping the positional relationship as shown in fig. 2D based on the distance report from the UE. This is because the distance between UEs is long, and signal separation between UEs can be performed appropriately.

According to the first embodiment described above, it is possible to appropriately report the UE-UE distance, the UE-network distance, and the like.

< second embodiment >

A second embodiment relates to distance-based CSI reporting.

The UE may change (or control or determine) CSI to be reported based on the information on the distance between the UE and at least one of the base station (e.g., the gNB) and another UE described in the first embodiment.

For example, the UE may transmit detailed CSI when a specific condition is satisfied with respect to the distance. Here, the detailed CSI may be CSI for deriving, calculating, acquiring, and the like, a detailed channel state with respect to normal CSI (that is, CQI, PMI, RI, and the like). The detailed CSI may also include, for example, one or more (e.g., all) of amplitude information, phase information, and angle information of the channel. The detailed CSI may also be replaced with information for correcting digital or analog beams.

The angle information may correspond to information related to at least one of an orientation of the UE (e.g., an orientation of a display, an orientation of an antenna panel, and the like), an orientation of the base station or another UE viewed from the UE, an orientation of a specific location (e.g., north pole) viewed from the UE, and the like.

In addition, the UE may transmit a specific notification to the base station when transmitting detailed CSI. For example, the specific notification may contain information indicating that MIMO spatial multiplexing is not recommended (or recommended). The UE may also send the specific notification to the base station instead of sending the detailed CSI. The detailed CSI may also contain the specific notification.

The specific condition may correspond to any one of or a combination of the following:

the distance between the UE and the base station is greater (farther) than the first threshold value,

The distance between the UE and another UE is smaller (closer) than the second threshold.

In addition, "large" may be replaced with "small". "Small" may also be replaced with "Large". The first threshold, the second threshold, and the like may be assigned by higher layer parameters (may be set by higher layer signaling), or may be defined by specifications.

The UE may transmit the distance report as described in the first embodiment when the specific condition is not satisfied.

The triggering, timing, channel, and the like of the CSI report in the second embodiment may be controlled based on the content of the CSI report instead of the distance report in the first embodiment, and therefore, the description thereof will not be repeated. In addition, the CSI report may be triggered at the same time (at the same time) as the distance report, or may be transmitted at the same timing.

The above-described description will be made by taking fig. 2A to 2D as an example. The base station may transmit at least one of setting information, an activation signal, and a trigger signal for requesting a detailed CSI report to the UE when grasping the positional relationship as shown in fig. 2B based on the distance report from the UE. This is because the distance between UEs is short, and it is preferable that detailed channel information be available for signal separation between UEs.

When the base station grasps the positional relationship as shown in fig. 2C or 2D based on the distance report from the UE, the base station may not transmit the setting information, the activation signal, the trigger signal, and the like for requesting the detailed CSI report to the UE (that is, the base station may set the normal CSI report to the UE). This is because the distance between UEs is long and simple CSI is sufficient.

Fig. 3A and 3B are diagrams illustrating an example of CSI reports or distance reports according to the second embodiment. It is assumed that these examples are the same process flow as fig. 1, and therefore the same description will not be repeated.

In fig. 3A, the cognitive distance measurement results in the UE being close to other UEs (e.g., less than the second threshold). In this example, the UE may also report detailed CSI to the base station.

In fig. 3B, the cognitive distance measurement results in the UE being far away from other UEs (e.g., greater than the second threshold). In this example, the UE may transmit the distance report without reporting detailed CSI to the base station.

According to the second embodiment described above, CSI reporting, distance reporting, and the like can be appropriately controlled according to the UE-UE distance and the UE-network distance.

< third embodiment >

A third embodiment relates to beam correction for a distance-based UE.

The UE may also determine or correct MIMO-related transmit or receive processing (e.g., at least one of digital beams and analog beams) based on information related to the distance of the UE from at least one of a base station (e.g., a gNB) and another UE. The information related to the distance may be the same as that described in the first embodiment.

The UE may measure the distance while changing the MIMO transmission process or the MIMO reception process (for example, simulating the direction of a beam), thereby deriving the positional relationship (for example, angular relationship) between the base station and at least one of the other UEs.

The UE may determine or correct MIMO-related transmission or reception processing based on the positional relationship, instead of or in addition to the distance-related information.

Further, when the MIMO-related transmission or reception process is determined or corrected, the UE may transmit a specific notification indicating that the determination or correction is performed to the base station. When determining or correcting MIMO-related transmission or reception processing, the UE may transmit information related to the determined or corrected MIMO transmission processing or MIMO reception processing to the base station.

Fig. 4A and 4B are diagrams illustrating an example of beam correction of the UE according to the third embodiment. In this example, it is contemplated that the base station can communicate with the UE and other UEs using at least one of beams #1- # 4.

In fig. 4A, a UE uses a transmission or reception beam of beam #2 directed to the base station, and other UEs use a transmission or reception beam of beam #3 directed to the base station. Here, the UE measures at least one of the distance and the angle between the UE and the other UE based on (the resource of) the distance measurement signal transmitted from the other UE. As a result, the UE may perform control such that the beam (e.g., analog beam) is changed to beam #1 directed to the base station as shown in fig. 4B.

By such autonomous control of the UE, it is possible to improve the quality of transmission/reception signals of each UE when a plurality of UEs are present.

The UE may determine or correct the MIMO-related transmission/reception process using a specific model. Here, the specific model may be a prediction model created by Artificial Intelligence (AI). The AI may also include at least one of machine learning, deep learning, and the like.

The input parameters of the specific model may include at least one of:

measurement results of signals for distance measurement from at least one of the base station and other UEs,

Measurements (e.g., received strength) using a transmit or receive beam (e.g., an analog beam),

Information on the distance between UEs,

Angle information of the transmission or reception beam,

Granularity information of the change of the transmission or reception beam,

Information of how many times the beam is rotated from a certain timing.

Here, the granularity information may be information of a minimum angle between beams that can be formed, or the like.

The measurement result of the distance measurement signal, the measurement result using the beam, and the like may include at least one of the following, and may be derived based on at least one of the following (for example, whether or not the measurement value is equal to or greater than a specific threshold value, and the like):

amplitude of the signal

The phase of the signal

Received Power (e.g., Reference Signal Received Power (RSRP))) (e.g., a Received Signal Power (RSRP) of a Received Signal,

Reception Quality (e.g., Reference Signal Received Quality (RSRQ)), Signal to Interference plus Noise Ratio (SINR)), Signal to Noise Ratio (SNR)), Block Error Rate (BLER), Bit Error Rate (BER)), Packet Error Rate (PER))), and reception Quality (e.g., Reference Signal Received Quality (RSRQ)), Signal to Interference plus Noise Ratio (SINR)), Signal to Noise Ratio (SNR)), Block Error Rate (BLER), Bit Error Rate (BER)), and Packet Error Rate (PER)))

Signal Strength (e.g., Received Signal Strength Indicator (RSSI)).

The information on how many times the beam has been rotated from a certain timing may be referred to as the number of beam scanning (beam sweeping).

The input parameters may be acquired by, for example, the UE receiving (measuring) a distance measurement signal while changing the analog beam.

The output parameters of the particular model may also include, for example, parameters for MIMO-related transmit or receive processing (e.g., at least one of digital beams and analog beams). The parameter may be, for example, angle information (e.g., an angle offset, a precoder, a phase offset) of a digital beam or an analog beam.

According to the studies of the present inventors, there is a statistically significant correlation between each of the above-mentioned input parameters and the above-mentioned output parameters. Therefore, for example, a learned model can be generated using a combination of the above-described actually measured values of the input parameters and the output parameters as training data (training data). The model may be generated by the UE, the network (e.g., base station), or another device, or the model generated by another device may be stored in the UE.

The UE may perform quality evaluation based on the input parameter and output the output parameter when the quality satisfies a specific condition. The quality evaluation may be performed based on, for example, the complex number, amplitude, phase, received power (RSRP, etc.), received quality (RSRQ, BLER, BER, PER, etc.), signal strength (RSSI, etc.), whether the reception measurement result is equal to or higher than a specific threshold value, or lower.

The UE may also perform quality evaluation based on a particular sequence of input parameters. For example, the UE may perform quality evaluation using the i + k (e.g., k ═ 1) th input parameter when the quality for the ith input is better than the quality for the ith-j (e.g., j ═ 1) th input, or may output the parameter based on the ith-j input if this is not the case. The UE may determine whether to reevaluate the next input parameter based on a change amount obtained by applying a differential (e.g., time differential) to the quality evaluation amount for the input parameter.

According to the third embodiment described above, beams can be appropriately controlled according to the UE-UE distance and the UE-network distance.

< others >

In addition, "distance" in the present disclosure may also be replaced with at least one of received power (e.g., RSRP), received quality (e.g., RSRQ, RSSI, BLER, BER, PER), signal strength (e.g., RSSI), number of attempts, number of transmissions, number of retransmissions, moving speed, and the like.

Here, the reception power, the reception quality, the signal strength, the number of attempts, the number of transmissions, the number of retransmissions, and the like may be written with "a specific signal (for example, a signal for distance measurement or a certain reference signal) omitted. The moving speed may mean a moving speed of at least one of the UE, the other UE, and the base station, and may also mean a relative speed of two of them.

In addition, at least one of the "distance", "distance report", and "information on distance" in the present disclosure may be replaced with information (for example, position information (for example, latitude and longitude) and angle information of the UE, the base station, or another UE) that can be used for obtaining the distance.

In addition, at least one of "UE", "other UE", and the like in the present disclosure may be replaced with, for example, a UE (may also be referred to as a head UE) that collectively performs UE-UE communication.

(Wireless communication System)

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

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

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

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

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

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

The user terminal 20 may also be connected to at least one of the plurality of base stations 10. The user terminal 20 may use at least one of Carrier Aggregation (CA) and Dual Connectivity (DC) using a plurality of Component Carriers (CCs)).

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

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

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

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

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

The radio communication system 1 may use a radio access scheme based on Orthogonal Frequency Division Multiplexing (OFDM). For example, in at least one of the downlink (dl)) and the uplink (ul)), Cyclic Prefix OFDM (CP-OFDM), Discrete Fourier Transform Spread OFDM (DFT-s-OFDM), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier Frequency Division Multiple Access (SC-FDMA), or the like may be used.

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

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

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

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

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

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

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

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

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

In addition, in the present disclosure, a downlink, an uplink, and the like may also be expressed without "link". Further, it can be said that "Physical (Physical)" is not attached to the head of each channel.

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

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

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

(base station)

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Further, the transmission/reception unit 120 may receive information on the distance to the base station 10 or another user terminal 20 from the user terminal 20. The transceiver unit 120 may also receive information (e.g., UE ID) for identifying the base station 10 or the other user terminal 20 corresponding to the information related to the distance.

In the present disclosure, the spatial domain filter used for transmission by the base station, the downlink spatial domain transmission filter (downlink spatial domain transmission filter), and the transmission beam of the base station may be replaced with each other. The spatial domain filter for reception of the base station, the uplink spatial domain receive filter (uplink spatial domain receive filter), and the reception beam of the base station may be replaced with each other.

(user terminal)

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

The transmitting unit and the receiving unit of the user terminal 20 in the present disclosure may be configured by at least one of the transmitting/receiving unit 220 and the transmitting/receiving antenna 230.

Further, control section 210 may acquire a distance to base station 10 or other user terminal 20. For example, at least one of the control unit 210 and the transmission/reception unit 220 may measure, derive, calculate, or the like the distance based on the distance measurement signal transmitted from at least one of the base station 10 and the other user terminals 20. The transmitting and receiving unit 220 may also transmit information related to the distance.

The transceiver unit 220 may also transmit information (for example, UE ID) for identifying the base station 10 or the other user terminal 20 corresponding to the information related to the distance.

Control unit 210 may also determine whether to transmit specific channel state information (e.g., detailed CSI) based on the distance.

The control unit 210 may also perform correction of beams used for transmission or reception based on the distance. The beam correction may include, for example, determination of a precoder, correction of an angle of a beam, and the like.

Control section 210 may correct the beam based on beam angle information outputted by inputting the granularity information of the change of the beam of the user terminal to an estimation model generated based on the granularity information of the change of the beam and the measured value of the beam angle information.

In the present disclosure, the spatial domain filter used for transmission of the UE, the uplink spatial domain transmission filter (uplink spatial domain transmission filter), and the transmission beam of the UE may be replaced with each other. The spatial domain filter for UE reception, the downlink spatial domain receive filter (downlink spatial domain receive filter), and the UE reception beam may be replaced with each other.

(hardware construction)

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

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

For example, the base station, the user terminal, and the like in one embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 8 is a diagram showing an example of hardware configurations of a base station and a user terminal according to an embodiment. The base station 10 and the user terminal 20 may be physically configured as a computer device including a processor 1001, a memory (memory)1002, a storage (storage)1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like.

In addition, in the present disclosure, terms of devices, circuits, apparatuses, sections (sections), units, and the like can be interchanged with one another. The hardware configuration of the base station 10 and the user terminal 20 may include one or more of the respective devices shown in the drawings, or may not include some of the devices.

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

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

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

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

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

The memory 1003 is a computer-readable recording medium, and may be configured by at least one of a flexible disk (flexible Disc), a Floppy (registered trademark) disk, an optical disk (e.g., a Compact Disc read only memory (CD-ROM)) or the like), a digital versatile Disc (dvd), a Blu-ray (registered trademark) disk), a removable disk (removable Disc), a hard disk drive, a smart card (smart card), a flash memory device (e.g., a card (card), a stick (stick), a key drive), a magnetic stripe (stripe), a database, a server, or another suitable storage medium. The storage 1003 may also be referred to as a secondary storage device.

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

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

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

The base station 10 and the user terminal 20 may be configured to include hardware such as a microprocessor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Programmable Logic Device (PLD), a Field Programmable Gate Array (FPGA), or the like, and a part or all of the functional blocks may be implemented by the hardware. For example, the processor 1001 may also be installed with at least one of these hardware.

(modification example)

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

The BWP may include UL BWP (UL BWP) and DL BWP (DL BWP). For the UE, one or more BWPs may also be set within one carrier.

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

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

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

In the present disclosure, the names used for the parameters and the like are not limitative names in all aspects. Further, the mathematical expressions and the like using these parameters may also be different from those explicitly disclosed in the present disclosure. Since various channels (PUCCH, PDCCH, etc.) and information elements can be identified by any suitable names, the names assigned to these various channels and information elements are not limitative names in all aspects.

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

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

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

The information notification is not limited to the embodiment and embodiment described in the present disclosure, and may be performed by other methods. For example, the Information notification in the present disclosure may be implemented by physical layer signaling (e.g., Downlink Control Information (DCI)), Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC)) signaling, broadcast Information (Master Information Block (MIB)), System Information Block (SIB)), or the like), Medium Access Control (MAC) signaling), other signals, or a combination thereof.

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

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

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

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

Software, instructions, information, and the like may also be transmitted or received via a transmission medium. For example, where the software is transmitted from a website, server, or other remote source (remote source) using at least one of wired technology (coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), etc.) and wireless technology (infrared, microwave, etc.), at least one of these wired and wireless technologies is included within the definition of transmission medium.

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

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

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

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

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

There are also instances when a mobile station is referred to as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset (hand set), user agent, mobile client, or several other appropriate terms.

At least one of the base station and the mobile station may also be referred to as a transmitting apparatus, a receiving apparatus, a wireless communication apparatus, and the like. At least one of the base station and the mobile station may be a device mounted on a mobile body, a mobile body main body, or the like. The mobile body may be a vehicle (e.g., a vehicle, an airplane, etc.), may be a mobile body that moves in an unmanned manner (e.g., a drone (a drone), an autonomous vehicle, etc.), or may be a robot (manned or unmanned). At least one of the base station and the mobile station includes a device that does not necessarily move when performing a communication operation. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

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

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

In the present disclosure, the operation performed by the base station is sometimes performed by an upper node (upper node) of the base station, depending on the case. In a network including one or more network nodes (network nodes) having a base station, it is obvious that various operations performed for communication with a terminal may be performed by the base station, one or more network nodes other than the base station (for example, a Mobility Management Entity (MME), a Serving-Gateway (S-GW), and the like are considered, but not limited thereto), or a combination thereof.

The embodiments and modes described in the present disclosure may be used alone, may be used in combination, or may be switched depending on execution. Note that, in the embodiments and the embodiments described in the present disclosure, the order of the processes, sequences, flowcharts, and the like may be changed as long as they are not contradictory. For example, elements of various steps are presented in an exemplary order for a method described in the present disclosure, but the present invention is not limited to the specific order presented.

The aspects/embodiments described in the present disclosure may also be applied to Long Term Evolution (LTE), LTE-Advanced (LTE-a), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, fourth generation Mobile communication System (4 generation communication System (4G)), fifth generation Mobile communication System (5G)), Future Radio Access (FRA), New Radio Access Technology (RAT)), New Radio (New Radio trademark (NR)), New Radio Access (NX)), New Radio Access (Future Radio Access), FX), Global Broadband communication System (Global System for Mobile communication (GSM)), and Mobile Broadband communication System (CDMA) (2000 Mobile communication System)), (CDMA, etc.) IEEE 802.11(Wi-Fi (registered trademark)), IEEE 802.16(WiMAX (registered trademark)), IEEE 802.20, Ultra-wideband (uwb), Bluetooth (registered trademark), a system using another appropriate wireless communication method, a next generation system expanded based on these, and the like. Furthermore, multiple systems may also be applied in combination (e.g., LTE or LTE-a, combination with 5G, etc.).

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

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

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

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

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

The "determination (decision)" may be replaced with "assumption", "expectation", "consideration", and the like.

The terms "connected", "coupled" or all variations thereof as used in this disclosure mean all connections or couplings, direct or indirect, between two or more elements, and can include a case where one or more intermediate elements exist between two elements that are "connected" or "coupled" to each other. The combination or connection between the elements may be physical, logical, or a combination thereof. For example, "connect" may also be replaced with "access".

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

In the present disclosure, the term "a is different from B" may mean "a and B are different from each other". In addition, the term may also mean "a and B are different from C, respectively". Terms such as "separated," combined, "and the like may likewise be construed as" different.

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

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

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