WO2020213141A1

WO2020213141A1 - User terminal and wireless communication method

Info

Publication number: WO2020213141A1
Application number: PCT/JP2019/016689
Authority: WO
Inventors: 翔平吉岡; 祐輝松村; 大輔村山; 聡永田
Original assignee: 株式会社Ｎｔｔドコモ
Priority date: 2019-04-18
Filing date: 2019-04-18
Publication date: 2020-10-22
Also published as: CN113728559A

Abstract

A user terminal according to one embodiment of the present disclosure is characterized by having a control unit that derives the distance to a base station or another user terminal, and a transmission unit that transmits information relating to said distance. This embodiment of the present disclosure makes it possible to optimally utilize MIMO even in cases in which complete channel information cannot be obtained.

Description

User terminal and wireless communication method

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

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 NR, it is being considered to support MIMO, which is a further extension of Multi Input Multi Output (MIMO) spatial multiplexing introduced in LTE, and to improve communication throughput.

For the spatial separation of MIMO, it is preferable to obtain complete channel information (ultimately, information on the amplitude and phase of all signals). However, feedback of complete channel information requires more resources, which reduces communication throughput.

Therefore, there is a need for a method that enables full utilization of the spatial area (MIMO) even when the necessary channel information cannot be sufficiently obtained. However, such a method has not yet been studied.

Therefore, one of the purposes of the present disclosure is to provide a user terminal and a wireless communication method that can suitably use MIMO even when complete channel information cannot be obtained.

The user terminal according to one aspect of the present disclosure is characterized by having a control unit for deriving a distance from a base station or another user terminal, and a transmission unit for transmitting information regarding the distance.

According to one aspect of the present disclosure, MIMO can be suitably used even when complete channel information cannot be obtained.

FIG. 1 is a diagram showing an example of a distance report according to the first embodiment. FIG. 2A-2D is a diagram showing an example of the positional relationship of UEs. 3A and 3B are diagrams showing an example of a CSI report or a distance report according to the second embodiment. 4A and 4B are diagrams showing 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 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.

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. Further, 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, etc., and reports the result to the network as channel state information (CSI). The CSI may include, for example, Channel Quality Indicator (CQI), Precoding Matrix Indicator (PMI), Rank Indicator (RI), and the like.

For the spatial separation of MIMO, it is preferable to obtain complete channel information (ultimately, information on the amplitude and phase of all signals). However, the feedback of detailed channel information requires that much resource, which reduces the communication throughput.

Therefore, the present inventors have conceived a method that can improve the performance of MIMO spatial separation even when only limited feedback information can be obtained. According to one aspect of the present disclosure, it is assumed that gNB-UE, UE-UE, etc. are related to channel correlation, and operations related to MIMO are performed based on distance information such as gNB-UE, UE-UE, etc. To control (apply / switch).

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, "distance" is "UE-base station distance" (for example, "own UE-base station distance") and "UE-UE distance" (for example, "own UE-other UE distance"). It may be read as at least one of.

In the following embodiment, the UE determines the distance from at least one of the base station and the other UE based on a predetermined distance measurement signal transmitted from at least one of the base station and the other UE. It is assumed to be measured or estimated, but it is not limited to this. The UE may acquire, derive, or the like the distance by any method. The distance measurement signal of the present disclosure may be read as at least one of a measurement signal, a reference signal, a channel, a synchronization signal, and the like.

(Wireless communication method)
<First Embodiment>
The first embodiment relates to distance reporting.

The UE may transmit information about the distance (which may be called a distance report) to the network (for example, 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 be referred to as periodic distance reports, semi-persistent distance reports and aperiodic distance reports, respectively.

The UE may receive the setting information for distance reporting by upper layer signaling. For example, the setting information includes the timing of distance reporting (for example, whether to use periodic reporting, semi-persistent reporting, or aperiodic reporting), resources for distance reporting (for example, time resources (period, etc.), etc.). It may include information such as frequency resources).

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 UE for which the periodic distance report is set may transmit the distance report in a predetermined cycle (for example, the cycle indicated by the upper layer parameter, the cycle defined by the specification).

Does the UE configured for semi-persistent distance reporting perform distance reporting for a predetermined period (eg, the period indicated by the upper layer parameters, the period specified by the specification) based on the activation signal from the network? You may control whether or not.

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

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 the distance report, the activation signal, the trigger signal, and the like may include information for designating the measurement target. The UE may send a distance report containing the distance for the specified measurement target. For example, as a measurement target, a specific base station, a specific UE, a base station that satisfies a specific condition among all base stations, a UE that satisfies a specific condition among all UEs, and the like may be specified.

The UE that satisfies a specific condition may be a UE that has transmitted a predetermined distance measurement signal.

The UE may transmit the distance report using the channel for distance reporting, an existing channel (for example, an uplink shared channel (Physical Uplink Shared Channel (PUSCH)), an uplink control channel (Physical Uplink Control Channel (PUCCH)). )), Random access channel (Physical Random Access Channel (PRACH), etc.) may be used for transmission.

The distance report may include information about the distance between the own UE and at least one of the base station (eg, gNB) and another UE. The distance may be a measured distance or an index obtained based on the measured distance.

The index may be, for example, a parameter indicating whether or not at least one of the base station and another UE is present within a predetermined distance, and the level of the distance to the measurement target (for example, close, medium). It may be far away). The correspondence between the level and the distance may be set in the UE by higher layer signaling or may be defined by the specifications.

Note that the distance report may include information for identifying (identifying) the own UE (for example, a user identifier (UE Identifier (ID))). The UE ID may be a predetermined wireless network temporary identifier (Radio Network Temporary Identifier (RNTI)), or may be, for example, a cell RNTI (Cell RNTI (C-RNTI)).

A distance report containing information on the distance to another UE may include information for identifying the other UE (eg, UE ID).

The UE may transmit the distance report at the same timing as the uplink control information (UCI), may report it as one of the UCIs (for example, CSI), or may have a timing different from that of the UCI. You may report (independently) at. The UCI of the present disclosure is at least one of delivery confirmation information (for example, Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK)), scheduling request (Scheduling Request (SR)), and channel state information (Channel State Information (CSI)). It may mean one.

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 its own UE and the other UE based on the distance measurement signal (resource) transmitted from another UE (UE with UE ID # A). The UE transmits a distance report including information on the measured distance, the ID of the other UE (UE ID # A), and the like to the base station.

The base station may calculate the positional relationship of the UE based on the reported distance information. For example, the base station may calculate an angle with respect to a plurality of UEs as seen from its own station (an angle consisting of a line connecting the own station and the plurality of UEs).

The base station may determine or correct a MIMO precoder (eg, at least one of a digital beam and an analog beam) based on the calculated UE positional relationship, or apply UE scheduling (eg, MU-MIMO). User pairing and user selection to apply SU-MIMO) may be performed.

FIG. 2A-2D is a diagram showing an example of the positional relationship of UEs.

In FIG. 2A, the distance between the UE and the base station is short, and the distance between the UE and other UEs is also short. When the base station grasps the positional relationship as shown in FIG. 2A based on the distance report from the UE, SU-MIMO may be applied to the UE. This is because the distance between the UEs is short and signal separation between the UEs cannot be preferably performed.

In FIG. 2B, the distance between the UE and the base station is long, and the distance between the UE and other UEs is short. 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 that does not apply MU-MIMO to the UE and the other UE. This is because the distance between the UEs is short and signal separation between the UEs cannot be preferably performed.

In FIG. 2C, the distance between the UE and the base station is short or medium, and the distance between the UE and other UEs is long. When the base station grasps the positional relationship as shown in FIG. 2C based on the distance report from the UE, the base station may apply MU-MIMO to the UE and other UEs. This is because the distance between the UEs is long and the signal separation between the UEs can be preferably performed.

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

According to the first embodiment described above, the distance between UE and UE, the distance between UE and network, and the like can be preferably reported.

<Second embodiment>
A second embodiment relates to distance-based CSI reporting.

The UE modifies (or controls or determines) the reported CSI based on information about the distance between its own UE and at least one of the base station (eg, gNB) and another UE described in the first embodiment. You may.

For example, the UE may transmit a detailed CSI when a predetermined condition is satisfied with respect to the distance. Here, the detailed CSI may be a CSI for deriving, calculating, acquiring, or the like a channel state more detailed than a normal CSI (that is, CQI, PMI, RI, etc.). The detailed CSI may include, for example, one or more (eg, all) of channel amplitude information, phase information and angle information. The detailed CSI may be read as information for correction of digital or analog beams.

The angle information is the orientation of the UE (for example, the orientation of the display, the orientation of the antenna panel, etc.), the orientation of the base station or another UE as seen from the UE, and a predetermined point (for example, the North Pole) as seen from the UE. It may correspond to information about at least one such as orientation.

Note that the UE may send a predetermined notification to the base station when transmitting the detailed CSI. For example, the given notification may include information indicating that MIMO spatial multiplexing is not recommended (or recommended). The UE may send the predetermined notification to the base station instead of sending the detailed CSI. The detailed CSI may include the given notice.

The prescribed conditions may correspond to any of the following or a combination thereof:
-The distance between the UE and the base station is greater than (far) than the first threshold value.
-The distance between one UE and another UE is smaller (closer) than the second threshold.

Note that "large" may be read as "small". "Small" may be read as "large". Further, the first threshold value, the second threshold value, and the like may be given by the upper layer parameter (may be set by the upper layer signaling), or may be determined by the specification.

The UE may send a distance report as described in the first embodiment if the above predetermined conditions are not satisfied.

The trigger, timing, channel, etc. of the CSI report of the second embodiment may be controlled based on the content of the distance report of the first embodiment read in the CSI report, so that the back explanation is not repeated. The CSI report may be triggered (collectively) at the same time as the distance report, or may be transmitted at the same timing.

The above-mentioned FIG. 2A-2D will be described as an example. When the base station grasps the positional relationship as shown in FIG. 2B based on the distance report from the UE, the base station provides the UE with at least one of the setting information, the activation signal, and the trigger signal for requesting the detailed CSI report. You may send it to. This is because the distance between the UEs is short, and it is preferable that detailed channel information is available for signal separation between the 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 provides the UE with setting information, an activation signal, a trigger signal, etc. for requesting a detailed CSI report. It is not necessary to send (that is, a normal CSI report may be set for the UE). This is because the distance between UEs is long and a simple CSI is sufficient.

3A and 3B are diagrams showing an example of a CSI report or a distance report according to the second embodiment. Since these examples assume the same processing flow as in FIG. 1, the same description will not be repeated.

In FIG. 3A, as a result of the distance measurement, the UE recognized that the distance to the other UE was short (for example, smaller than the second threshold value). In this example, the UE may report the detailed CSI to the base station.

In FIG. 3B, as a result of the distance measurement, the UE recognized that the distance from the other UE was long (for example, larger than the second threshold value). In this example, the UE may send a distance report without reporting the detailed CSI to the base station.

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

<Third embodiment>
A third embodiment relates to distance-based UE beam correction.

A UE performs transmit or receive processing (eg, at least one of a digital beam and an analog beam) with respect to MIMO based on information about the distance between its own UE and at least one of a base station (eg, gNB) and another UE. It may be determined or amended. The information regarding the distance may be the same as the information described in the first embodiment.

By measuring the distance while changing the MIMO transmission process or MIMO reception process (for example, the direction of the analog beam), the UE has a positional relationship (for example, an angular relationship) with at least one of the base station and another UE. May be derived.

The UE may determine or correct the transmission or reception process for MIMO based on the positional relationship, instead of or in addition to the information about the distance.

When the UE determines or corrects the transmission or reception processing related to MIMO, the UE may transmit a predetermined notification indicating that the determination or correction has been made to the base station. When the UE determines or corrects the transmission or reception processing relating to MIMO, the UE may transmit information regarding the MIMO transmission processing or MIMO reception processing after the determination or correction to the base station.

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

In FIG. 4A, the UE uses the transmission or reception beam directed to the base station beam # 2, and the other UEs use the transmission or reception beam directed to the base station beam # 3. Here, the UE measures at least one of the distance and the angle between the own 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 control to change the beam (for example, an analog beam) so as to be directed to the beam # 1 of the base station as shown in FIG. 4B.

By such autonomous control of UEs, the quality of transmission / reception signals of each UE when a plurality of UEs exist can be improved.

The UE may determine or correct the transmission / reception processing related to MIMO described above by using a predetermined model. Here, the predetermined model may be a prediction model created by artificial intelligence (AI) or the like. The AI may include at least one such as machine learning, deep learning and the like.

The input parameters of the given model may include at least one of the following:
-Measurement result of distance measurement signal from at least one of the base station and other UE,
-Measurement results (eg, reception intensity) using a transmit or receive beam (eg, analog beam),
· Information about the distance between UEs,
・ Angle information of transmission or reception beam,
・ Particle size information of change of transmission or reception beam,
-Information on how many times the beam was turned from a certain timing.

Here, the particle size information may be information on the minimum angle between the beams that can be formed.

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, or may be derived based on at least one of the following (for example, the measured value is predetermined). Whether or not it is above the threshold value of):
-Signal amplitude-Signal phase-Received power (eg Reference Signal Received Power (RSRP)),
-Reception quality (for example, Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR), Block Error Rate (BLER)), Bit Error Rate (Bit Error) Rate (BER)), Packet Error Rate (PER)),
• Signal strength (eg, Received Signal Strength Indicator (RSSI)).

Information on how many times the beam has been turned from a certain timing may be called the number of beam sweeping.

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

The output parameters of the above-mentioned predetermined model may include, for example, parameters for transmission or reception processing related to MIMO (for example, at least one of a digital beam and an analog beam). The parameter may be, for example, angle information of a digital beam or an analog beam (for example, angle offset, precoder, phase shift amount) and the like.

According to the studies by the present inventors, each of the above-mentioned input parameters has a statistically significant correlation with the above-mentioned output parameters. Therefore, for example, a trained model can be created by using a combination of the measured values of the above-mentioned input parameters and output parameters as teacher data. The model may be created by the UE, a network (for example, a base station) or other device, or a model created by the other device may be stored in the UE.

The UE may perform quality evaluation based on the above input parameters and output the above output parameters when the quality satisfies a predetermined condition. In the quality evaluation, for example, the complex number of the channel, amplitude, phase, received power (RSRP, etc.), reception quality (RSRQ, BLER, BER, PER, etc.), signal strength (RSSI, etc.), reception measurement result is equal to or higher than a predetermined threshold. It may be done based on whether or not.

The UE may perform quality evaluation based on input parameters in a predetermined order. For example, the UE uses the i + k (eg, k = 1) th input parameter when the quality for the i-th input is better than the quality for the ij (eg, j = 1) th input. Quality evaluation may be performed, and if not, parameters may be output based on the ijth input. The UE may decide whether or not to re-evaluate with the next input parameter based on the amount of change obtained by applying a derivative (for example, time derivative) to the quality evaluation amount with respect to the input parameter.

According to the third embodiment described above, the beam can be suitably controlled according to the distance between UE and UE and the distance between UE and network.

<Others>
The "distance" in the present disclosure includes received power (for example, RSRP), reception quality (for example, RSRQ, RSSI, BLER, BER, PER), signal strength (for example, RSSI), number of trials, number of transmissions, and number of retransmissions. , Movement speed, etc. may be read as at least one.

Here, the received power, reception quality, signal strength, number of trials, number of transmissions, number of retransmissions, etc. are written by omitting "a predetermined signal (for example, a distance measurement signal, a certain reference signal)". There may be. The moving speed may mean at least one moving speed of a UE, another UE and a base station, or may mean the relative speed of two of them.

In addition, at least one of "distance", "distance report", "information about distance", and the like in the present disclosure is information that can be used to obtain the distance (for example, position information of a UE, a base station, or another UE (for example,). , Latitude / longitude), angle information).

Further, at least one such as "UE", "another UE", and "another UE" in the present disclosure is, for example, a UE that controls communication between UEs (may be called a head UE). It may be read as.

(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 a dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), and a 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 to detect the 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 transmission / reception unit 120 includes a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmission / reception 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 transformation, fast Fourier transform (FFT) processing, and inverse discrete Fourier transform (IDFT) on the acquired baseband signal. )) Processing (if necessary), filtering, demapping, demodulating, 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 measuring 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 receive information regarding the distance from the base station 10 or another user terminal 20 from the user terminal 20. The transmission / reception unit 120 may receive information (for example, UE ID) for identifying the base station 10 or the other user terminal 20 corresponding to the information regarding the distance.

In the present disclosure, the spatial domain filter for transmission of the base station, the downlink spatial domain transmission filter (downlink spatial domain transmission filter), and the transmission beam of the base station may be read as 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 receive beam of the base station may be read as each other.

(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 transmission / reception unit 220 can be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmission / reception circuit, and the like, which are described based on common recognition in the technical fields 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) performs 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 control unit 210 may acquire the distance from the base station 10 or another user terminal 20. For example, at least one of the control unit 210 and the transmission / reception unit 220 measures, derives, calculates, etc. the distance based on the distance measurement signal transmitted from at least one of the base station 10 and the other user terminal 20. May be good. The transmission / reception unit 220 may transmit information regarding the distance.

The transmission / reception unit 220 may transmit information (for example, UE ID) for identifying the base station 10 or the other user terminal 20 corresponding to the information regarding the distance.

The control unit 210 may determine whether or not to transmit predetermined channel state information (for example, detailed CSI) based on the distance.

The control unit 210 may correct the beam for transmission or reception based on the distance. This beam correction may include, for example, precoder determination, beam angle correction, and the like.

The control unit 210 inputs the beam change particle size information of the user terminal into the estimation model generated based on the measured values of the beam change particle size information and the beam angle information, and outputs the beam angle information. The beam may be corrected based on the above.

In the present disclosure, the spatial domain filter for transmitting the UE, the uplink spatial domain transmission filter (uplink spatial domain transmission filter), and the transmitting beam of the UE may be read as each other. The spatial domain filter for receiving the UE, the downlink spatial domain receive filter (downlink spatial domain receive filter), and the received beam of the UE may be read as each other.

(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 two or more devices that are physically or logically separated). , 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) for functioning 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. 8 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 the present 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 (EEPROM), 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, a magneto-optical 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 may also be abbreviated as RS, and may be referred to as 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. Numerology 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 (Orthogonal Frequency Division Multiple Access (OFDMA) symbol, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol, etc.) in the time domain. In addition, 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, minislot 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.

In addition, 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) 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.

In addition, 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, executable files, execution threads, procedures, functions, 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 has been 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 inter-terminal communication (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)), LTE 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 in this disclosure, are any direct or indirect connections or connections 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 control unit that derives the distance from the base station or other user terminals,
A user terminal comprising a transmission unit for transmitting information regarding the distance.
The user terminal according to claim 1, wherein the transmission unit transmits information for identifying the base station or the other user terminal corresponding to the information regarding the distance.
The user terminal according to claim 1 or 2, wherein the control unit determines whether or not to transmit predetermined channel state information based on the distance.
The user terminal according to any one of claims 1 to 3, wherein the control unit corrects a beam for transmission or reception based on the distance.
The control unit inputs the beam change particle size information of the user terminal into the estimation model generated based on the measured values of the beam change particle size information and the beam angle information, and outputs the beam angle information. The user terminal according to claim 4, wherein the beam is corrected based on the above.
Steps to derive the distance to the base station or other user terminals,
A method of wireless communication of a user terminal, which comprises a step of transmitting information regarding the distance.