JP7144520B2 - User terminal and wireless communication method - Google Patents

Description

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

In the UMTS (Universal Mobile Telecommunications System) network, long term evolution (LTE: Long Term Evolution) has been specified for the purpose of further high data rate, low delay, etc. (Non-Patent Document 1). In addition, LTE-A (LTE Advanced, LTE Rel. 10, 11, 12, 13) was specified for the purpose of further increasing the capacity and sophistication of LTE (LTE Rel. 8, 9).

LTE successor systems (for example, FRA (Future Radio Access), 5G (5th generation mobile communication system), 5G + (plus), NR (New Radio), NX (New radio access), FX (Future generation radio access), LTE Also referred to as Rel.14 or 15 or later) is also under consideration.

In the existing LTE system (e.g., LTE Rel.8-13), the user terminal (UE: User Equipment) detects a synchronization signal (SS: Synchronization Signal), the network (e.g., base station (eNB: eNode B) ) and identifies the cell to be connected (for example, identified by a cell ID (Identifier)). Such processing is also called a cell search. Synchronization signals include, for example, PSS (Primary Synchronization Signal) and/or SSS (Secondary Synchronization Signal).

In addition, the UE receives broadcast information (eg, master information block (MIB: Master Information Block), system information block (SIB: System Information Block), etc.), setting information for communication with the network (system information etc.).

The MIB may be transmitted on a physical broadcast channel (PBCH), and the SIB may be transmitted on a physical downlink shared channel (PDSCH).

3GPP TS 36.300 V8.12.0 "Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 (Release 8)", April 2010

Future wireless communication systems (for example, 3GPP Rel. 15 and later, also called NR, 5G, 5G+, etc.) will utilize measurements using synchronization signal blocks (SSBs).

In measurements using SSB, for example, based on the received power of the synchronization signal (eg, SS-RSRP: Synchronization signal reference signal received power) and the received signal strength (eg, RSSI: Received Signal Strength Indicator), the synchronization signal It is assumed to determine the reception quality (eg SS-RSRQ: Synchronization signal reference signal received quality).

Also, support for a carrier that does not transmit SSB (for example, Component Carrier: CC) is under consideration. However, if reception quality is not properly obtained in a carrier on which no measurement signal is transmitted, system performance may be degraded.

Accordingly, one object of the present disclosure is to provide a user terminal and a wireless communication method that appropriately acquire reception quality in carriers on which measurement signals are not transmitted.

A user terminal according to one aspect of the present disclosure is configured to measure the reception power of the measurement signal in the first CC, and a receiving unit that receives the measurement signal in the first component carrier (CC) in one band, and a control unit that is set to measure at least one of reception strength and reception quality on the second CC when the measurement signal is not transmitted on the second CC in the band, and the control unit is configured to measure The band for measuring the received signal strength is determined based on at least one of the data subcarrier interval, the measurement signal subcarrier interval, and the active downlink partial band .

According to one aspect of the present disclosure, it is possible to appropriately acquire at least one of reception strength and reception quality in a carrier on which no measurement signal is transmitted.

FIG. 1 is a diagram illustrating an example of intra-band CA using CCs on which SSB is transmitted and CCs on which SSB is not transmitted. FIG. 2 is a diagram illustrating an example of RSRQ measurement in a CC on which SSB is transmitted and a CC on which SSB is not transmitted. FIG. 3 is a diagram illustrating an example of a schematic configuration of a radio communication system according to an embodiment. FIG. 4 is a diagram illustrating an example of the overall configuration of a base station according to one embodiment. FIG. 5 is a diagram illustrating an example of a functional configuration of a base station according to an embodiment; FIG. 6 is a diagram illustrating an example of the overall configuration of a user terminal according to one embodiment. FIG. 7 is a diagram illustrating an example of a functional configuration of a user terminal according to one embodiment; FIG. 8 is a diagram illustrating an example of hardware configurations of a base station and a user terminal according to one embodiment.

<Measurement>
In future wireless communication systems (for example, 3GPP Rel.15 and later, also called NR, 5G, 5G+, etc.), the following measurements are being considered:
(1) Measurement Gap (MG) unnecessary intra-frequency measurement (Intra-frequency measurement without MG),
(2) MG required intra-frequency measurement (Intra-frequency measurement with MG),
(3) Inter-frequency measurement.

The MG-free intra-frequency measurement of (1) above is also called same-frequency measurement that does not require RF retuning. The MG-required intra-frequency measurement of (2) above is also called the same-frequency measurement that requires RF retuning. For example, if the signal to be measured is not included in the band of the active BWP (BandWidth Part), RF retuning is required even for same-frequency measurement, so the above measurement (2) is performed.

In the measurement gap (MG: Measurement Gap), the user terminal switches (retunes) the used frequency (RF: Radio Frequency) from the serving carrier to the non-serving carrier, measures using a reference signal, etc., and then changes the used frequency. Switching from a non-serving carrier to a serving carrier.

Here, BWP corresponds to one or more partial frequency bands within a component carrier (CC: Component Carrier, carrier, cell, NR carrier) set to NR. A BWP may also be referred to as a partial frequency band, partial band, or the like. The BWP may include at least one of a downstream BWP (DL BWP) and an upstream BWP (UL BWP).

The inter-frequency measurement of (3) above is also called inter-frequency measurement. It is assumed that the different frequency measurement uses MG. However, the UE is a base station (for example, BS (Base Station), transmission / reception point (TRP: Transmission / Reception Point), eNB (eNodeB), gNB (NR Node B), etc.), inter-frequency measurements without MG are possible.

In NR, while same-frequency carriers or different-frequency carriers are being measured using MG, RF is switched, so transmission and reception in the serving cell cannot be performed.

In LTE, NR, etc., for at least one of same-frequency measurement and inter-frequency measurement, reference signal received power (RSRP: Reference Signal Received Power) of non-serving carrier, received signal strength indicator (RSSI: Received Signal Strength Indicator) and reference signal At least one of received quality (RSRQ: Reference Signal Received Quality) and SINR (Signal to Interference plus Noise Ratio) may be measured.

Here, RSRP is the received power of the desired signal, for example, at least cell-specific reference signal (CRS: Cell-specific Reference Signal), channel state information reference signal (CSI-RS: Channel State Information-Reference Signal), etc. Measured using one. RSSI is the total received power including the received power of the desired signal and the interference and noise power. RSRQ is the ratio of RSRP to RSSI.

The desired signal may be a signal included in a synchronization signal block (SSB). An SSB is a signal block that includes a synchronization signal (SS) and a broadcast channel (also called a broadcast signal, PBCH, NR-PBCH, etc.), and may be called an SS/PBCH block or the like.

SS may include PSS (Primary Synchronization Signal), SSS (Secondary Synchronization Signal), NR-PSS, NR-SSS, and the like. The SSB is composed of one or more symbols (eg, OFDM symbols). Within the SSB, the PSS, SSS and PBCH may each be placed in one or more different symbols. For example, the SSB may consist of a total of 4 or 5 symbols, including 1 symbol of PSS, 1 symbol of SSS, and 2 or 3 symbols of PBCH.

Note that measurements performed using SS (or SSB) may be referred to as SS (or SSB) measurements. As SS (or SSB) measurements, for example, SS-RSRP, SS-RSSI, SS-RSRQ, SS-SINR measurements, etc. may be performed.

By the way, the user terminal, based on the received power of the synchronization signal (eg, SS-RSRP: Synchronization signal reference signal received power) and the received signal strength in the NR carrier (eg, RSSI: Received Signal Strength Indicator, NR carrier RSSI), It is assumed to determine the received quality of the synchronization signal (eg SS-RSRQ: Synchronization signal reference signal received quality).

For example, SS-SRRQ may be defined as follows.
SS-RSRQ = N x SS-RSRP/NR carrier RSSI
Here, N may be the number of resource blocks included in the maximum allowed bandwidth for NR carrier RSSI measurement (maximum allowed bandwidth or measurement bandwidth).

SS-RSRP is defined by a linear average over the power contributions of resource elements carrying a synchronization signal (SS). Time resources for SS-RSRP measurements may be defined within the SMTC window period. SS-RSRP may be measured only between reference signals corresponding to SS/PBCH blocks within the same SS/PBCH block index and the same physical-layer cell identity. If higher layers indicate the SS/PBCH block on which to measure SS-RSRP, SS-RSRP may be measured on the indicated SS/PBCH block. Note that SS-RSRP may be measured using at least one of PSS, SSS and other signals (eg, CSI-RS).

The NR carrier RSSI constitutes a linear average of the total received power over an OFDM symbol with time resources for measurement and the bandwidth for measurement. The measurement bandwidth may consist of N resource blocks. The NR carrier RSSI may include interference and thermal noise from all sources including co-channel serving and non-serving cells. The time resource for measurement of NR carrier RSSI may be defined within the SMTC window period.

Similar to SS-RSRP, NR carrier RSSI is being considered to be measured in the SS/PBCH block. That is, the maximum permissible bandwidth for NR carrier RSSI measurement is considered to be the SS/PBCH block bandwidth (eg, 20 PRB), similar to the SS-RSRP measurement bandwidth.

<RSRQ setting>
UE, for RSRQ (SS-RSRQ) measurement using SSB, RSRQ (CSI-RSRQ) using CSI-RS, etc., information element (Information Element: IE) indicating the measurement object (MeasObjectNR) by higher layer signaling may be set.

The measurement target includes at least one of SSB frequency (ssbFrequency), SSB subcarrier spacing (ssbSubcarrierSpacing), SSB measurement timing configuration (SSB-MTC or SMTC), and reference signal configuration (referenceSignalConfig). It's okay. ssbFrequency indicates the center frequency of SSB. ssbSubcarrierSpacing indicates the SSB subcarrier spacing. SMTC indicates SSB measurement timing (cycle, offset, time length, etc.).

The referenceSignalConfig may include at least one of SSB configuration for mobility (ssb-ConfigMobility) and CSI-RS resource configuration for mobility (csi-rs-ResourceConfigMobility). The UE can be configured by referenceSignalConfig whether to use SSB or CSI-RS as the reference signal for measurements.

ssb-ConfigMobility may include at least one of SSB for measurement (ssb-ToMeasure), serving cell timing for synchronization (useServingCellTimingForSync), and SS-RSSI measurement (SS-RSSI-Measurement). ssb-ToMeasure indicates the set of SSBs measured within the SMTC measurement period. ssb-ToMeasure indicates the SSB to be measured by a bitmap corresponding to the SSB index. useServingCellTimingForSync indicates whether serving cell timing is used to derive the index of SSBs transmitted by neighboring cells for same-frequency measurements (whether neighboring cells and serving cells are synchronized). SS-RSSI-Measurement configures RSSI measurement based on the synchronization reference signal (synchronization signal in SSB). SS-RSSI-Measurement may indicate at least one of a slot and a symbol (time resource) in which SS-RSSI measurement is performed.

The aforementioned CSI-RS resource configuration for mobility (csi-rs-ResourceConfigMobility) may include at least one of subcarrier spacing (subcarrierSpacing) and CSI-RS cell list for mobility (csi-RS-CellList-Mobility). . csi-RS-CellList-Mobility is a list of CSI-RS cells for mobility (CSI-RS-CellMobility).

CSI-RS-CellMobility is cell ID (cellId), CSI-RS measurement bandwidth (csi-rs-MeasurementBW), density (density), CSI-RS resource list for mobility (csi-rs-ResourceList-Mobility), At least one may be included. csi-rs-MeasurementBW may include the number of PRBs in the measurement band (nrofPRBs) and the start PRB in the measurement band (startPRB). density may indicate the frequency domain density of 1-port CSI-RS for L3 mobility. csi-rs-ResourceList-Mobility is a list of CSI-RS resources for mobility (CSI-RS-Resource-Mobility).

CSI-RS-Resource-Mobility includes CSI-RS index (csi-RS-Index), slot configuration (slotConfig), associated SSB (associatedSSB), frequency domain allocation (frequencyDomainAllocation), first OFDM symbol in time domain (firstOFDMSymbolInTimeDomain), sequence generation configuration (sequenceGenerationConfig). The associatedSSB indicates the SSB associated with the CSI-RS resource, and may include an SSB index and presence or absence of QCL (Quasi-Co-Located).

<When using a CC that does not transmit SSB>
In some CCs of intra-band CA (Carrier Aggregation), support for operation without transmitting SSB is under consideration. The problem is how the UE performs RRM (Radio Resource Management) measurements on CCs on which SSB is not transmitted.

The following scenarios 1 and 2 are assumed as scenarios using CCs that do not have SSB (no SSB is transmitted).

<Scenario 1>
As shown in FIG. 1, there is a CC with SSB (to which SSB is transmitted) in the same band as a CC without SSB, and a CC without SSB and a CC with SSB are connected to the same base station. Operated co-located.

Synchronization, RSRP, etc. are almost the same among multiple CCs in the same band operated at the same base station location. By the UE performing at least one of synchronization and RSRP measurement for CCs with SSB, cell activation/deactivation of other CCs can be flexibly performed, and RSRPs of other CCs can be performed flexibly. does not need to be measured. In addition, the overhead of SSB transmission can be reduced by the base station not performing SSB transmission on some of multiple CCs. Also, since the UE does not need to measure RSRP on each CC, the measurement load can be reduced.

<Scenario 2>
UE performs RRM measurements using CSI-RS instead of SSB.

In this case, even if multiple CCs are not operated at the same base station location (even if they are operated at different base station locations), the CSI-RS is transmitted on each CC, so that the UE can see the quality of each CC. (RSRP, RSRQ, etc.) can be measured. A base station can manage the quality of each CC and assign an appropriate CC (cell) to each UE.

In Scenario 1, it can be assumed that RSRP is approximately the same among multiple CCs in a band. On the other hand, there are cases where the amount of traffic-dependent interference differs from CC to CC. This case is, for example, when the base station distributes multiple UEs to multiple CCs. For example, in FIG. 1, CC#0 may have much traffic (congested) and CC#1 may have little traffic (empty).

It is conceivable that the base station distributes traffic by deciding which CC to connect the UE to based on measurement results including the amount of interference, such as RSRQ and SINR. However, in Scenario 1 and Scenario 2, if measurement signals (SSB, CSI-RS) are transmitted on each CC in order to obtain measurement results including the amount of interference for each CC, the overhead of transmission of measurement signals increases.

Therefore, the present inventors have studied a method for suppressing the overhead for measuring at least one of the reception strength and reception quality in carriers on which measurement signals are not transmitted, and have arrived at the present invention.

Hereinafter, embodiments according to the present disclosure will be described in detail with reference to the drawings.

Also, hereinafter, higher layer signaling may be, for example, RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling, broadcast information, or the like, or a combination thereof.

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

In the present disclosure, cell, serving cell, carrier and CC may be interchanged. In the present disclosure, measurement signal, reference signal, synchronization signal, SSB, and CSI-RS may be read interchangeably.

(embodiment)
If the UE is set to RSRP measurement using a measurement signal (reference signal) in at least one CC (1st CC) in one band, the UE in the CC (2nd CC) in which the measurement signal in the band is not transmitted RSRQ measurements may be configured. The measurement signal may be at least one of SSB and CSI-RS.

For example, if SS-RSRP measurements are configured on at least one first CC within a band, the UE may be configured for SS-RSRQ measurements on the second CC on which no SSB is transmitted within that band.

The UE may measure RSRP on the first CC, measure RSSI on the second CC, and calculate the RSRQ of the second CC based on the RSRP of the first CC and the RSSI of the second CC.

If the UE is configured with SS-RSRQ on the 2nd CC, it may use the SS-RSRP measured on the 1st CC in the SS-RSRQ calculation. In other words, the UE may regard the SS-RSRP of the first CC as the SS-RSRP of the second CC when SS-RSRQ on the second CC is configured.

When the UE is configured with SS-RSRQ in the second CC, it uses the SS-RSSI measured in the specific band in the second CC in calculating the SS-RSRQ.

The specific band may be all or part of the band of the active DL BWP in the second CC. A specific band may be a band centered at an indicated frequency (eg, ssbFrequency) and having a predetermined bandwidth (eg, 20 PRB). The predetermined bandwidth may be the same bandwidth as the bandwidth of the measurement signal (SSB or CSI-RS). A specific band may be a band having at least one of a center frequency and a bandwidth indicated for RSSI measurement.

For example, as shown in FIG. 2, assume that a UE performs intra-band CA using CC #0 to #5 in one band, and SSB is transmitted only on CC #2 (first CC). The UE measures SS-RSRP using the SSB of CC#2. The UE measures SS-RSSI in each of CC#0-#5. The UE calculates SS-RSRQ on CC#2 based on SS-RSRP on CC#2 and SS-RSSI on CC#2. Furthermore, the UE regards SS-RSRP in CC#2 as SS-RSRP in other CCs (CC#0, #1, #3, #4, and #5). That is, the UE calculates SS-RSRQ for each CC based on SS-RSRP for CC#2 and SS-RSSI for each CC.

According to this embodiment, when multiple CCs in one band are operated at the same base station location, the measurement signal transmission is reduced by not transmitting the measurement signal (SSB or CSI-RS) in some CCs. overhead can be reduced, and the RSRP measurement load in the UE can be reduced.

The UE can report received quality (RSRQ) even on CCs on which measurement signals are not transmitted. As a result, even if measurement signals are not transmitted on some of the CCs, the base station can distribute the traffic by allocating CCs to the UEs based on the traffic-dependent reception quality. can.

Detailed contents of the embodiment will be described below. Each of the contents below may be applied independently, or may be applied in combination.

<Method of instructing RSRQ measurement in CCs on which SSB is not transmitted>
The UE may be instructed to measure RSRQ on a CC on which no SSB is transmitted (second CC) according to one of the following RSRQ measurement indication methods 1-3.

<<RSRQ measurement instruction method 1>>
The UE may be explicitly instructed to perform SS-RSRQ measurement without SSB (SSB less SS-RSRQ measurement). For example, the higher layer signaling (MeasObjectNR) may contain a 1-bit field indicating SS-RSRQ measurement without SSB.

The UE may not be informed of ssbFrequency and ssbSubcarrierSpacing if explicitly indicated for SS-RSRQ measurements without SSB. In this case, MeasObjectNR may not include ssbFrequency and ssbSubcarrierSpacing.

The UE may be notified of the RSSI measurement band (center frequency, bandwidth) by another higher layer signaling, may use a fixed RSSI measurement band defined in the specification, or using a predetermined rule The RSSI measurement band may be determined from certain parameters.

<<RSRQ measurement instruction method 2>>
The UE may be implicitly instructed to measure SS-RSRQ without SSB by not including ssbSubcarrierSpacing in the signaled MeasObjectNR.

Furthermore, the UE may be indicated the center frequency of the RSSI measurement band by ssbFrequency included in MeasObjectNR. In other words, if MeasObjectNR does not include ssbSubcarrierSpacing, the UE may interpret ssbFrequency included in MeasObjectNR to indicate the center frequency of the RSSI measurement band.

The UE may be notified of the bandwidth of the RSSI measurement band by another higher layer signaling, may use a fixed bandwidth defined in the specification, or may determine the band from specific parameters using a predetermined rule. width may be determined.

The bandwidth of the RSSI measurement band may be a fixed bandwidth defined in specifications. The fixed bandwidth may be 20 PRBs (eg, the number of PRBs of SSB) at SubCarrier Spacing (SCS) of data (PDSCH) of the serving cell (second CC).

The bandwidth of the RSSI measurement band may be set by another higher layer signaling. As another higher layer signaling, an IE for RSSI measurement bandwidth may be added.

<<RSRQ measurement instruction method 3>>
The UE may be implicitly instructed to measure SS-RSRQ without SSB by being informed of all 0s (no SSB to be measured) as ssb-ToMeasure (bitmap). good.

Additionally, the UE may be indicated the center frequency of the RSSI measurement band by ssbFrequency. Additionally, the UE may be instructed by ssbSubcarrierSpacing the SCS to determine the bandwidth of the RSSI measurement band. In other words, if ssb-ToMeasure is all 0, the UE may interpret ssbFrequency to indicate the center frequency of the RSSI measurement band, or ssbSubcarrierSpacing to indicate the SCS for determining the bandwidth of the RSSI measurement band. may be interpreted.

The UE may be informed of the bandwidth of the RSSI measurement band by another higher layer signaling, or may use a fixed bandwidth defined in the specification, or derived from specific parameters using predetermined rules. bandwidth may be used.

The bandwidth of the RSSI measurement band may be a fixed bandwidth defined in specifications.

A fixed number of PRBs in the RSSI measurement band may be specified in the specification. For example, the UE may determine the bandwidth from the SSB SCS specified by ssbSubcarrierSpacing and a fixed number of PRBs (eg, 20 PRBs, the number of PRBs in SSB), and the SCS of the serving cell (second CC) data. , a fixed number of PRBs (for example, 20 PRBs, the number of PRBs in SSB) may be determined as the bandwidth.

The bandwidth of the RSSI measurement band may be set by another information element. Higher layer signaling (MeasObjectNR) may contain an information element regarding the bandwidth of the RSSI measurement band.

According to the RSRQ measurement instruction method described above, the UE can recognize that the RSRQ measurement is to be performed in a CC on which no SSB is transmitted, and can appropriately configure the RSRQ measurement.

<RSSI measurement method for CCs on which SSB is not transmitted>
The UE may measure RSSI on the second CC according to one of the following RSSI measurement methods 1-3.

<<RSSI measurement method 1>>
The UE may be explicitly informed of the center frequency and bandwidth of the RSSI measurement band. Higher layer signaling may include an information element indicating the center frequency and bandwidth of the RSSI measurement band.

The bandwidth may be signaled by an absolute value (eg, in MHz). Multiple combinations of SCS and number of PRBs may be specified and the UE may be informed of the index of one combination and determine the bandwidth based on that combination. Multiple candidates for at least one of the SCS and PRB numbers may be specified, and the UE may be informed of the index of one candidate and determine the bandwidth based on that candidate. The value of one of the SCS and PRB numbers is defined in the specification, the UE is notified of the other value, and the bandwidth may be determined from the notified value and the value defined in the specification.

<<RSSI measurement method 2>>
The UE may be indicated the center frequency of the RSSI measurement band by ssbFrequency. Furthermore, the UE may use a fixed bandwidth defined in the specification for the RSSI measurement band, or may use a bandwidth derived from specific parameters using predetermined rules.

The bandwidth of the RSSI measurement band may be a fixed bandwidth defined in specifications.

A fixed number of PRBs for the RSSI measurement band (eg, 20 PRBs, the number of PRBs for SSB) may be defined in the specification. For example, the UE may determine the bandwidth from the SSB SCS specified by ssbSubcarrierSpacing and a fixed number of PRBs.

MeasObjectNR may not include ssbSubcarrierSpacing. The UE may determine a fixed number of PRBs of bandwidth for the SCS of data in the serving cell (second CC). The UE may determine a fixed number of PRBs bandwidth for the SCS of the active DL BWP. The UE may determine a fixed number of PRBs of bandwidth for the SSB SCS of the first CC.

When the UE performs RSSI measurement (inter-frequency measurement) of CCs other than the serving cell in the same band, the UE may determine the bandwidth of a fixed number of PRBs for the SSB SCS of the first CC. . That is, the UE can determine the bandwidth even with RSSI measurements of CCs that are not notified of the serving cell configuration (SCS of data).

<<RSSI measurement method 3>>
In intra-frequency measurement, the UE may measure RSSI in the RSSI measurement band within the active DL BWP of the CC whose RSSI is to be measured. Measurements within an active DL BWP eliminate the need for RF retuning.

The RSSI measurement band may be UE implementation dependent or may be a fixed band defined in the specification. For example, the fixed band may be the center 20 PRBs (eg, SSB bandwidth) of the active DL BWP.

According to the above RSSI measurement method, the UE can appropriately set the RSSI measurement band, and appropriately perform RSSI measurement even in CCs on which SSB is not transmitted, inter-frequency measurements (CCs other than serving cells), and same-frequency measurements. can be done.

<RSSI measurement time resource>
The UE may be configured with time resources (at least one of slots and symbols) for RSSI measurement by SS-RSSI-Measurement included in ssb-ConfigMobility.

If the UE is not configured with SS-RSSI-Measurement, the UE may, by default, use all symbols within the SMTC period (window) for RSSI measurement.

<Receive beamforming>
The UE may use receive beamforming (BF) for RSRP and RSSI measurements. Even when performing RSRP measurement and RSSI measurement in one CC, the UE may perform RSSI measurement using the same reception BF as the reception BF used for RSRP measurement. The UE may perform RSSI measurement using the same received BF used for RSRP measurement even if the CC for RSRP measurement and the CC for RSSI measurement are different. This allows the UE to make RSSI measurements using the appropriate beam.

<Report content>
The UE may use the RSRP of the first CC and the RSSI of the second CC to calculate the RSRQ of the second CC and report the RSRQ. The UE may report the RSRP of the 1st CC as the RSRP of the 2nd CC, or may report the RSRP of the 1st CC and not report the RSRP of the 2nd CC. The UE may report the RSSI of the second CC.

<Measurement using CSI-RS>
When configured for CSI-RSRP measurements on at least one first CC within a band, the UE may be configured for CSI-RSRQ measurements on the second CC on which no CSI-RS is transmitted within that band.

When the UE measures RSRP using CSI-RS (CSI-RSRP) in at least one CC in one band, the UE may use the CSI-RSRP for RSRQ measurement of other CCs.

SSB in the above-described measurements using SSB (SS-RSRP, SS-RSSI, SS-RSRQ) may be read as CSI-RS. The UE may be instructed to measure RSRQ on a CC on which CSI-RS is not transmitted (second CC) in a manner similar to one of RSRQ measurement indication methods 1-3 described above. The UE may measure the RSSI on the second CC in a manner similar to one of RSSI measurement methods 1-3 above.

For example, the UE may be explicitly instructed to perform CSI-RSRQ measurement without CSI-RS (CSI-RS less CSI-RSRQ measurement) in the same manner as in RSRQ measurement instruction method 1 described above. For example, higher layer signaling (MeasObjectNR) may include a 1-bit field indicating CSI-RSRQ measurement without CSI-RS.

The UE may be instructed to measure CSI-RSRQ without CSI-RS by configuring only a CSI-RS resource (CSI-RS-Resource-Mobility) containing a CSI-RS index of a specific value. good.

According to the above measurement using CSI-RS, the UE measures CSI-RSRP in the first CC where CSI-RS is transmitted, measures CSI-RSSI in each CC, measures CSI-RSRP in the first CC, It can be viewed as CSI-RSRP on each CC. Also, the UE can calculate the CSI-RSRQ on the second CC where no CSI-RS is transmitted.

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

FIG. 3 is a diagram illustrating an example of a schematic configuration of a radio communication system according to an embodiment. In the radio communication system 1, carrier aggregation (CA) and / or dual connectivity (DC) that integrates a plurality of basic frequency blocks (component carriers) with the system bandwidth of the LTE system (e.g., 20 MHz) as one unit is applied. can do.

The wireless communication system 1 includes LTE (Long Term Evolution), LTE-A (LTE-Advanced), LTE-B (LTE-Beyond), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system), NR (New Radio), FRA (Future Radio Access), New-RAT (Radio Access Technology), etc., or a system that implements these.

A wireless communication system 1 includes a base station 11 forming a macrocell C1 with a relatively wide coverage, and base stations 12 (12a-12c) arranged in the macrocell C1 and forming a small cell C2 narrower than the macrocell C1. I have. User terminals 20 are arranged in the macro cell C1 and each small cell C2. The arrangement, number, etc. of each cell and user terminals 20 are not limited to the embodiment shown in the figure.

A user terminal 20 can be connected to both the base station 11 and the base station 12 . The user terminal 20 is assumed to use the macrocell C1 and the small cell C2 simultaneously using CA or DC. Also, the user terminal 20 may apply CA or DC using a plurality of cells (CCs).

Communication can be performed between the user terminal 20 and the base station 11 using a relatively low frequency band (for example, 2 GHz) and a narrow band carrier (also called an existing carrier, legacy carrier, etc.). On the other hand, between the user terminal 20 and the base station 12, a carrier with a relatively high frequency band (for example, 3.5 GHz, 5 GHz, etc.) and a wide bandwidth may be used. The same carrier may be used. Note that the configuration of the frequency band used by each base station is not limited to this.

Also, the user terminal 20 can perform communication using time division duplex (TDD) and/or frequency division duplex (FDD) in each cell. Also, in each cell (carrier), a single neumerology may be applied, or a plurality of different neumerologies may be applied.

A numerology may be a communication parameter that applies to the transmission and/or reception of a certain signal and/or channel, e.g. subcarrier spacing, bandwidth, symbol length, cyclic prefix length, subframe length , TTI length, number of symbols per TTI, radio frame structure, certain filtering operations performed by the transceiver in the frequency domain, certain windowing operations performed by the transceiver in the time domain, and/or the like. For example, if a physical channel has different subcarrier spacing and/or different numbers of OFDM symbols, it may be said to have different numerologies.

The base station 11 and the base station 12 (or between two base stations 12) may be connected by wire (for example, an optical fiber conforming to CPRI (Common Public Radio Interface), X2 interface, etc.) or wirelessly. good.

The base station 11 and each base station 12 are each connected to a higher station device 30 and connected to a core network 40 via the higher station device 30 . Note that the upper station apparatus 30 includes, for example, an access gateway apparatus, a radio network controller (RNC), a mobility management entity (MME), etc., but is not limited thereto. Also, each base station 12 may be connected to the higher station apparatus 30 via the base station 11 .

Note that the base station 11 is a base station having relatively wide coverage, and may be called a macro base station, an aggregation node, an eNB (eNodeB), a transmission/reception point, or the like. Also, the base station 12 is a base station having local coverage, and includes a small base station, a micro base station, a pico base station, a femto base station, a HeNB (Home eNodeB), an RRH (Remote Radio Head), a transmission/reception point, and the like. may be called Hereinafter, the base stations 11 and 12 are collectively referred to as the base station 10 when not distinguished.

Each user terminal 20 is a terminal compatible with various communication systems such as LTE and LTE-A, and may include not only mobile communication terminals (mobile stations) but also fixed communication terminals (fixed stations).

In the radio communication system 1, as a radio access scheme, orthogonal frequency division multiple access (OFDMA) is applied to the downlink, and single carrier frequency division multiple access (SC-FDMA) is applied to the uplink. Frequency Division Multiple Access) and/or OFDMA are applied.

OFDMA is a multi-carrier transmission scheme in which a frequency band is divided into a plurality of narrow frequency bands (subcarriers) and data is mapped to each subcarrier for communication. SC-FDMA divides the system bandwidth into bands composed of one or continuous resource blocks for each terminal, and multiple terminals use different bands to reduce interference between terminals Single carrier transmission method. Note that the uplink and downlink radio access schemes are not limited to these combinations, and other radio access schemes may be used.

In the radio communication system 1, downlink channels include a downlink shared channel (PDSCH: Physical Downlink Shared Channel) shared by each user terminal 20, a broadcast channel (PBCH: Physical Broadcast Channel), a downlink L1/L2 control channel, and the like. Used. User data, higher layer control information, SIB (System Information Block), etc. are transmitted by the PDSCH. Moreover, MIB (Master Information Block) is transmitted by PBCH.

The downlink L1/L2 control channel includes PDCCH (Physical Downlink Control Channel), EPDCCH (Enhanced Physical Downlink Control Channel), PCFICH (Physical Control Format Indicator Channel), PHICH (Physical Hybrid-ARQ Indicator Channel), and the like. Downlink control information (DCI: Downlink Control Information) including PDSCH and/or PUSCH scheduling information and the like are transmitted by the PDCCH.

Note that a DCI that schedules DL data reception may be called a DL assignment, and a DCI that schedules UL data transmission may be called a UL grant.

PCFICH carries the number of OFDM symbols used for PDCCH. The PHICH transmits HARQ (Hybrid Automatic Repeat reQuest) acknowledgment information (for example, retransmission control information, HARQ-ACK, ACK/NACK, etc.) for PUSCH. EPDCCH is frequency-division multiplexed with PDSCH (downlink shared data channel), and is used for transmission of DCI and the like like PDCCH.

In the radio communication system 1, as uplink channels, an uplink shared channel (PUSCH: Physical Uplink Shared Channel) shared by each user terminal 20, an uplink control channel (PUCCH: Physical Uplink Control Channel), a random access channel (PRACH: Physical Random Access Channel) is used. User data, higher layer control information, etc. are transmitted by PUSCH. Also, the PUCCH transmits downlink radio quality information (CQI: Channel Quality Indicator), acknowledgment information, scheduling request (SR: Scheduling Request), and the like. A random access preamble for connection establishment with a cell is transmitted by PRACH.

In the radio communication system 1, as downlink reference signals, cell-specific reference signals (CRS), channel state information-reference signals (CSI-RS), demodulation reference signals (DMRS: DeModulation Reference Signal), Positioning Reference Signal (PRS), etc. are transmitted. In addition, in the radio communication system 1, measurement reference signals (SRS: Sounding Reference Signals), demodulation reference signals (DMRS), etc. are transmitted as uplink reference signals. Note that DMRS may also be called a user terminal-specific reference signal (UE-specific reference signal). Also, the reference signals to be transmitted are not limited to these.

<Base station>
FIG. 4 is a diagram illustrating an example of the overall configuration of a base station according to one embodiment. The base station 10 includes a plurality of transmitting/receiving antennas 101 , an amplifier section 102 , a transmitting/receiving section 103 , a baseband signal processing section 104 , a call processing section 105 and a transmission path interface 106 . Note that the transmitting/receiving antenna 101, the amplifier section 102, and the transmitting/receiving section 103 may be configured to include one or more.

User data transmitted from the base station 10 to the user terminal 20 on the downlink is input from the higher station apparatus 30 to the baseband signal processing section 104 via the transmission line interface 106 .

In the baseband signal processing unit 104, regarding user data, PDCP (Packet Data Convergence Protocol) layer processing, user data division / combination, RLC (Radio Link Control) RLC layer transmission processing such as retransmission control, MAC (Medium Access Control) transmission processing such as retransmission control (e.g., HARQ transmission processing), scheduling, transmission format selection, channel coding, inverse fast Fourier transform (IFFT) processing, precoding processing, etc. 103. Further, the downlink control signal is also subjected to transmission processing such as channel coding and inverse fast Fourier transform, and transferred to the transmitting/receiving section 103 .

Transmitting/receiving section 103 converts the baseband signal output from baseband signal processing section 104 after precoding for each antenna into a radio frequency band and transmits the converted signal. The radio frequency signal frequency-converted by the transmitting/receiving section 103 is amplified by the amplifier section 102 and transmitted from the transmitting/receiving antenna 101 . The transmitting/receiving unit 103 can be configured from a transmitter/receiver, a transmitting/receiving circuit, or a transmitting/receiving device described based on common recognition in the technical field according to the present disclosure. The transmitting/receiving section 103 may be configured as an integrated transmitting/receiving section, or may be configured from a transmitting section and a receiving section.

On the other hand, as for the uplink signal, the radio frequency signal received by the transmitting/receiving antenna 101 is amplified by the amplifier section 102 . The transmitting/receiving section 103 receives the upstream signal amplified by the amplifier section 102 . Transmitting/receiving section 103 frequency-converts the received signal into a baseband signal and outputs the baseband signal to baseband signal processing section 104 .

The baseband signal processing unit 104 performs Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing, and error correction on the user data contained in the input uplink signal. Decoding, reception processing for MAC retransmission control, and reception processing for the RLC layer and PDCP layer are performed, and transferred to the upper station apparatus 30 via the transmission line interface 106 . The call processing unit 105 performs call processing (setup, release, etc.) of communication channels, state management of the base station 10, management of radio resources, and the like.

The transmission line interface 106 transmits and receives signals to and from the higher station apparatus 30 via a predetermined interface. In addition, the transmission line interface 106 transmits and receives signals (backhaul signaling) to and from other base stations 10 via an interface between base stations (for example, an optical fiber conforming to CPRI (Common Public Radio Interface), an X2 interface). good too.

Note that the transmitting/receiving unit 103 may further include an analog beamforming unit that performs analog beamforming. The analog beamforming unit consists of an analog beamforming circuit (e.g., phase shifter, phase shift circuit) or an analog beamforming device (e.g., phase shifter) described based on common recognition in the technical field of the present invention. You may Also, the transmitting/receiving antenna 101 may be configured by an array antenna, for example.

FIG. 5 is a diagram illustrating an example of a functional configuration of a base station according to an embodiment of the present disclosure; Note that this example mainly shows the functional blocks that are characteristic of the present embodiment, and it may be assumed that the base station 10 also has other functional blocks necessary for wireless communication.

The baseband signal processing section 104 includes at least a control section (scheduler) 301 , a transmission signal generation section 302 , a mapping section 303 , a reception signal processing section 304 and a measurement section 305 . Note that these configurations need only be included in base station 10 , and some or all of the configurations need not be included in baseband signal processing section 104 .

A control unit (scheduler) 301 controls the entire base station 10 . The control unit 301 can be configured from a controller, a control circuit, or a control device that will be described based on common recognition in the technical field related to the present disclosure.

The control section 301 controls, for example, signal generation in the transmission signal generation section 302 and signal allocation in the mapping section 303 . Further, the control section 301 controls signal reception processing in the reception signal processing section 304, signal measurement in the measurement section 305, and the like.

Control section 301, system information, downlink data signals (eg, signals transmitted by PDSCH), downlink control signals (eg, signals transmitted by PDCCH and / or EPDCCH, acknowledgment information, etc.) scheduling (eg, resources allocation). Also, the control section 301 controls the generation of the downlink control signal, the downlink data signal, etc., based on the result of determining whether or not retransmission control is required for the uplink data signal.

The control section 301 controls scheduling of synchronization signals (for example, PSS (Primary Synchronization Signal)/SSS (Secondary Synchronization Signal)), downlink reference signals (for example, CRS, CSI-RS, DMRS), and the like.

The control unit 301 includes uplink data signals (eg, signals transmitted by PUSCH), uplink control signals (eg, signals transmitted by PUCCH and/or PUSCH, acknowledgment information, etc.), random access preambles (eg, PRACH signals to be transmitted), uplink reference signals, and so on.

The control unit 301 uses digital BF (e.g., precoding) in the baseband signal processing unit 104 and/or analog BF (e.g., phase rotation) in the transmission/reception unit 103 to form a transmission beam and/or a reception beam. may be performed. The control unit 301 may control beam formation based on downlink channel information, uplink channel information, and the like. These channel information may be acquired from the received signal processing section 304 and/or the measuring section 305 .

Transmission signal generation section 302 generates a downlink signal (downlink control signal, downlink data signal, downlink reference signal, etc.) based on an instruction from control section 301 and outputs it to mapping section 303 . The transmission signal generation unit 302 can be configured from a signal generator, a signal generation circuit, or a signal generation device described based on common recognition in the technical field according to the present disclosure.

The transmission signal generating section 302 generates, for example, based on an instruction from the control section 301, a DL assignment that notifies downlink data allocation information and/or a UL grant that notifies uplink data allocation information. Both DL assignments and UL grants are DCI and follow the DCI format. Also, the downlink data signal is subjected to coding processing and modulation processing according to the coding rate, modulation scheme, etc. determined based on channel state information (CSI) from each user terminal 20 and the like.

Based on an instruction from control section 301 , mapping section 303 maps the downlink signal generated by transmission signal generation section 302 to a predetermined radio resource, and outputs the result to transmission/reception section 103 . The mapping unit 303 can be configured from a mapper, a mapping circuit, or a mapping device described based on common understanding in the technical field related to the present disclosure.

Received signal processing section 304 performs reception processing (for example, demapping, demodulation, decoding, etc.) on the received signal input from transmitting/receiving section 103 . Here, the received signal is, for example, an uplink signal (uplink control signal, uplink data signal, uplink reference signal, etc.) transmitted from the user terminal 20 . The received signal processing unit 304 can be configured from a signal processor, a signal processing circuit, or a signal processing device described based on common recognition in the technical field according to the present disclosure.

Received signal processing section 304 outputs the information decoded by the reception processing to control section 301 . For example, when receiving PUCCH including HARQ-ACK, it outputs HARQ-ACK to control section 301 . In addition, received signal processing section 304 outputs the received signal and/or the signal after receiving processing to measuring section 305 .

A measurement unit 305 performs measurements on the received signal. The measurement unit 305 can be configured from a measuring instrument, a measuring circuit, or a measuring device described based on common understanding in the technical field related to the present disclosure.

For example, the measurement unit 305 may perform RRM (Radio Resource Management) measurement, CSI (Channel State Information) measurement, etc. based on the received signal. Measurement section 305 measures received power (eg, RSRP (Reference Signal Received Power)), received quality (eg, RSRQ (Reference Signal Received Quality), SINR (Signal to Interference plus Noise Ratio), SNR (Signal to Noise Ratio)) , signal strength (for example, Received Signal Strength Indicator (RSSI)), channel information (for example, CSI), and the like may be measured. A measurement result may be output to the control unit 301 .

<User terminal>
FIG. 6 is a diagram illustrating an example of the overall configuration of a user terminal according to one embodiment. The user terminal 20 includes a plurality of transmitting/receiving antennas 201 , an amplifier section 202 , a transmitting/receiving section 203 , a baseband signal processing section 204 and an application section 205 . Note that the transmission/reception antenna 201, the amplifier section 202, and the transmission/reception section 203 may be configured to include one or more.

A radio frequency signal received by the transmitting/receiving antenna 201 is amplified by the amplifier section 202 . The transmitting/receiving section 203 receives the downstream signal amplified by the amplifier section 202 . Transmitting/receiving section 203 frequency-converts the received signal into a baseband signal and outputs the baseband signal to baseband signal processing section 204 . The transmitting/receiving unit 203 can be configured from a transmitter/receiver, a transmitting/receiving circuit, or a transmitting/receiving device described based on common recognition in the technical field according to the present disclosure. The transmitting/receiving section 203 may be configured as an integrated transmitting/receiving section, or may be configured from a transmitting section and a receiving section.

The baseband signal processing section 204 performs FFT processing, error correction decoding, reception processing for retransmission control, and the like on the input baseband signal. Downlink user data is transferred to the application unit 205 . The application unit 205 performs processing related to layers higher than the physical layer and the MAC layer. In addition, among downlink data, broadcast information may also be transferred to the application unit 205 .

On the other hand, uplink user data is input from the application section 205 to the baseband signal processing section 204 . In the baseband signal processing unit 204, transmission processing for retransmission control (for example, HARQ transmission processing), channel coding, precoding, discrete Fourier transform (DFT) processing, IFFT processing, etc. are performed. 203.

The transmitting/receiving unit 203 converts the baseband signal output from the baseband signal processing unit 204 into a radio frequency band and transmits the radio frequency band signal. The radio frequency signal frequency-converted by the transmitting/receiving section 203 is amplified by the amplifier section 202 and transmitted from the transmitting/receiving antenna 201 .

Note that the transmitting/receiving unit 203 may further include an analog beamforming unit that performs analog beamforming. The analog beamforming unit consists of an analog beamforming circuit (e.g., phase shifter, phase shift circuit) or an analog beamforming device (e.g., phase shifter) described based on common recognition in the technical field of the present invention. You may Also, the transmitting/receiving antenna 201 may be configured by, for example, an array antenna.

Transmitting/receiving section 203 transmits and/or receives data in a cell included in a carrier in which SMTC is set. The transmitting/receiving unit 203 may receive information regarding same-frequency measurement and/or different-frequency measurement from the base station 10 .

FIG. 7 is a diagram illustrating an example of a functional configuration of a user terminal according to one embodiment; Note that this example mainly shows the functional blocks of the characteristic portions of the present embodiment, and it may be assumed that the user terminal 20 also has other functional blocks necessary for wireless communication.

The baseband signal processing section 204 of the user terminal 20 includes at least a control section 401 , a transmission signal generation section 402 , a mapping section 403 , a reception signal processing section 404 and a measurement section 405 . Note that these configurations need only be included in the user terminal 20 , and some or all of the configurations may not be included in the baseband signal processing section 204 .

The control unit 401 controls the user terminal 20 as a whole. The control unit 401 can be configured from a controller, a control circuit, or a control device that will be described based on common understanding in the technical field related to the present disclosure.

The control section 401 controls, for example, signal generation in the transmission signal generation section 402 and signal allocation in the mapping section 403 . Further, the control section 401 controls signal reception processing in the reception signal processing section 404, signal measurement in the measurement section 405, and the like.

The control section 401 acquires the downlink control signal and the downlink data signal transmitted from the base station 10 from the reception signal processing section 404 . The control section 401 controls the generation of the uplink control signal and/or the uplink data signal based on the result of determining whether retransmission control is necessary for the downlink control signal and/or the downlink data signal.

The control unit 401 uses digital BF (e.g., precoding) in the baseband signal processing unit 204 and/or analog BF (e.g., phase rotation) in the transmission/reception unit 203 to form a transmission beam and/or a reception beam. may be performed. The control unit 401 may control beam formation based on downlink channel information, uplink channel information, and the like. These channel information may be obtained from the received signal processing section 404 and/or the measuring section 405 .

Further, when various information notified from the base station 10 is acquired from the reception signal processing unit 404, the control unit 401 may update the parameters used for control based on the information.

Transmission signal generation section 402 generates an uplink signal (uplink control signal, uplink data signal, uplink reference signal, etc.) based on an instruction from control section 401 and outputs it to mapping section 403 . The transmission signal generation unit 402 can be configured from a signal generator, a signal generation circuit, or a signal generation device described based on common recognition in the technical field according to the present disclosure.

The transmission signal generating section 402 generates an uplink control signal related to acknowledgment information, channel state information (CSI), etc. based on an instruction from the control section 401, for example. Also, transmission signal generation section 402 generates an uplink data signal based on an instruction from control section 401 . For example, when the downlink control signal notified from the base station 10 includes the UL grant, the transmission signal generator 402 is instructed by the controller 401 to generate an uplink data signal.

Mapping section 403 maps the uplink signal generated by transmission signal generation section 402 to radio resources based on an instruction from control section 401 , and outputs the result to transmission/reception section 203 . The mapping unit 403 can be configured from a mapper, a mapping circuit, or a mapping device described based on common understanding in the technical field related to the present disclosure.

Received signal processing section 404 performs reception processing (for example, demapping, demodulation, decoding, etc.) on the received signal input from transmitting/receiving section 203 . Here, the received signal is, for example, a downlink signal (downlink control signal, downlink data signal, downlink reference signal, etc.) transmitted from the base station 10 . The received signal processing unit 404 can be configured from a signal processor, a signal processing circuit, or a signal processing device described based on common recognition in the technical field according to the present disclosure. Also, the received signal processing unit 404 can configure a receiving unit according to the present disclosure.

Received signal processing section 404 outputs the information decoded by the reception processing to control section 401 . Received signal processing section 404 outputs, for example, broadcast information, system information, RRC signaling, DCI, etc. to control section 401 . In addition, received signal processing section 404 outputs the received signal and/or the signal after receiving processing to measuring section 405 .

A measurement unit 405 performs measurements on the received signal. For example, the measuring section 405 may perform same-frequency measurement and/or different-frequency measurement using SSB for one or both of the first carrier and the second carrier. The measuring unit 405 can be configured from a measuring instrument, a measuring circuit, or a measuring device described based on common understanding in the technical field related to the present disclosure.

For example, measurement section 405 may perform RRM measurement, CSI measurement, etc. based on the received signal. Measurement section 405 may measure received power (eg, RSRP), received quality (eg, RSRQ, SINR, SNR), signal strength (eg, RSSI), channel information (eg, CSI), and the like. A measurement result may be output to the control unit 401 .

Transceiver 203 may receive measurement signals (eg, SSB, CSI-RS, etc.) on a first component carrier (CC) within one band.

When the control unit 401 is configured to measure the received power (for example, RSRP) of the measurement signal on the first CC and the measurement signal is not transmitted on the second CC in the band, the control unit 401 measures the received power on the second CC (for example, , RSSI) may be configured.

The control unit 401 may report the reception quality (for example, RSRQ) based on the received power measured on the first CC and the received power measured on the second CC.

The control unit 401 may determine whether the measurement signal is transmitted on the second CC based on higher layer signaling (eg MeasObjectNR).

The control unit 401 controls at least one of higher layer signaling, the subcarrier interval of data in the second CC, the subcarrier interval of the measurement signal, and an active downlink partial band (for example, active DL BWP). Based on this, the band for measuring the reception strength may be determined.

The measurement signal may be a synchronization signal block (eg, SSB, SS/PBCH block).

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

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

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

In the present disclosure, terms such as apparatus, circuit, device, section, and unit can be read interchangeably. The hardware configuration of the base station 10 and the user terminal 20 may be configured to include one or more of each device shown in the figure, or may be configured without some devices.

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

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

The processor 1001, for example, operates an operating system 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 device, registers, and the like. For example, the above-described baseband signal processing unit 104 (204), call processing unit 105, and the like may be realized by the processor 1001. FIG.

The processor 1001 also reads programs (program codes), software modules, data, etc. from at least one of the storage 1003 and the communication device 1004 to the memory 1002, and executes various processes according to these. As the program, a program that causes a computer to execute at least part of the operations described in the above embodiments is used. For example, the control unit 401 of the user terminal 20 may be implemented by a control program stored in the memory 1002 and running on the processor 1001, and other functional blocks may be implemented similarly.

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

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

The communication device 1004 is hardware (transmitting/receiving device) for communicating between computers via at least one of a wired network and a wireless network, and is also called a network device, a network controller, a network card, a communication module, or the like. The communication device 1004 includes a high-frequency switch, a duplexer, a filter, a frequency synthesizer, and the like, for example, in order to realize at least one of frequency division duplex (FDD) and time division duplex (TDD). may consist of For example, the transmitting/receiving antenna 101 (201), the amplifier section 102 (202), the transmitting/receiving section 103 (203), the transmission line interface 106, and the like described above may be realized by the communication device 1004. The transmission/reception unit 103 (203) may be physically or logically separated into a transmission unit 103a (203a) and a reception unit 103b (203b).

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

Devices such as the processor 1001 and the memory 1002 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 devices.

In addition, the base station 10 and the user terminal 20 include hardware such as microprocessors, digital signal processors (DSPs), ASICs (Application Specific Integrated Circuits), PLDs (Programmable Logic Devices), and FPGAs (Field Programmable Gate Arrays). hardware, and a part or all of each functional block may be realized using the hardware. For example, processor 1001 may be implemented using at least one of these pieces of hardware.

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

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

Here, a numerology may be a communication parameter that applies to the transmission and/or reception of a signal or channel. Numerology, for example, subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame structure, transmission and reception specific filtering operations performed by the receiver in the frequency domain, specific windowing operations performed by the transceiver in the time domain, and/or the like.

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

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

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

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

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

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

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

A TTI having a duration of 1 ms may also be called a normal TTI (TTI in LTE Rel. 8-12), normal TTI, long TTI, normal subframe, normal subframe, long subframe, slot, and so on. A TTI that is shorter than a regular TTI may also be called a shortened TTI, a short TTI, a partial or fractional TTI, a shortened subframe, a short subframe, a minislot, a subslot, a slot, and so on.

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

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

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

Note that one or more RBs are physical resource blocks (PRBs), sub-carrier groups (SCGs), resource element groups (REGs), PRB pairs, RB pairs, and the like. may be called.

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

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

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

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

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

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

The names used for parameters and the like in this disclosure are not limiting names in any way. Further, the formulas and the like using these parameters may differ from those expressly disclosed in this disclosure. Since the various channels (PUCCH (Physical Uplink Control Channel), PDCCH (Physical Downlink Control Channel), etc.) and information elements can be identified by any suitable name, the various names assigned to these various channels and information elements is not a definitive designation in any way.

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

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

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

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

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

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

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

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

Software, instructions, information, etc. may also be sent and received over a transmission medium. For example, the software uses wired technology (coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and/or wireless technology (infrared, microwave, etc.) to create websites, Wired and/or wireless technologies are included within the definition of transmission medium when sent from a server or other remote source.

As used in this disclosure, the terms "system" and "network" may be used interchangeably.

In the present disclosure, "precoding", "precoder", "weight (precoding weight)", "quasi-co-location (QCL: Quasi-Co-Location)", "TCI state (Transmission Configuration Indication state)", "spatial relationship (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 used interchangeably. can be used for

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

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

In this disclosure, terms such as “Mobile Station (MS),” “user terminal,” “User Equipment (UE),” “terminal,” etc. may be used interchangeably. .

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

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

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

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

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

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

Each aspect/embodiment described in the present disclosure is LTE (Long Term Evolution), LTE-A (LTE-Advanced), LTE-B (LTE-Beyond), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system), FRA (Future Radio Access), New-RAT (Radio Access Technology), NR (New Radio), NX (New radio access), FX (Future generation radio access), GSM (Registered Trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (Registered Trademark)), IEEE 802.16 (WiMAX (Registered Trademark)), IEEE 802.16 (Registered Trademark). 20, UWB (Ultra-WideBand), Bluetooth (registered trademark), and other appropriate wireless communication methods, and extended next-generation systems based on these. Also, multiple systems may be applied in combination (for example, a combination of LTE or LTE-A and 5G).

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

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

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

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

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

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

“Maximum transmit power” in the context of this disclosure may mean the maximum value of transmit power, may mean the nominal UE maximum transmit power, or may refer to the rated maximum transmit power (the rated UE maximum transmit power).

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

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

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

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

In this disclosure, where articles have been added by translation, such as a, an, and the in English, the disclosure may include the plural nouns following these articles.

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 this disclosure. The invention according to the present disclosure can be implemented as modifications and changes without departing from the spirit and scope of the invention determined based on the description of the claims. Therefore, the description of the present disclosure is for illustrative purposes and does not impose any limitation on the invention according to the present disclosure.

Claims (6)

a receiver for receiving a measurement signal on a first component carrier (CC) within one band;
Configured to measure the received power of the measurement signal on the first CC, and configured to measure at least one of received power and received quality on the second CC if the measurement signal is not transmitted on the second CC in the band. a control unit ;
The control unit determines a band for measurement of the reception strength based on at least one of a data subcarrier interval of the second CC, a subcarrier interval of the measurement signal, and an active downlink partial band. A user terminal characterized by: The user terminal according to claim 1, wherein the control unit reports reception quality based on the reception power measured on the first CC and the reception strength measured on the second CC. The user terminal according to claim 1 or 2, wherein the control unit determines whether the measurement signal is transmitted on the second CC based on higher layer signaling. The control unit measures at least one of the received strength and the received quality in a CC on which the measurement signal is not transmitted, depending on whether a specific field is included in an information element indicating a measurement target configured by higher layer signaling. 4. The user terminal according to claim 1, wherein the user terminal is instructed to The user terminal according to any one of claims 1 to 4, wherein said measurement signal is a synchronization signal block. receiving a measurement signal on a first component carrier (CC) within one band;
Configured to measure the received power of the measurement signal on the first CC, and configured to measure at least one of received power and received quality on the second CC if the measurement signal is not transmitted on the second CC in the band. process and
determining a band for the measurement of the received strength based on at least one of a subcarrier spacing of data in the second CC, a subcarrier spacing of the measurement signal, and an active downlink subband;
A wireless communication method for a user terminal, characterized by comprising:

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