WO2022085196A1

WO2022085196A1 - Terminal

Info

Publication number: WO2022085196A1
Application number: PCT/JP2020/039974
Authority: WO
Inventors: 朋樹横川; 英和下平
Original assignee: 株式会社Ｎｔｔドコモ
Priority date: 2020-10-23
Filing date: 2020-10-23
Publication date: 2022-04-28

Abstract

This terminal receives a downlink reference signal for channel state measurement, and executes layer 3 measurement using the downlink reference signal. The terminal changes a coefficient applied to the measurement cycle of the layer 3 measurement on the basis of the reception state of the downlink reference signal.

Description

Terminal

The present disclosure relates to a terminal that performs layer 3 measurement using a downlink reference signal.

The 3rd Generation Partnership Project (3GPP) specifies the 5th generation mobile communication system (also called 5G, New Radio (NR) or Next Generation (NG)), and next-generation specifications called Beyond 5G, 5G Evolution or 6G. We are also proceeding with the conversion.

For example, in 3GPP Release 15, a synchronization signal block, specifically, an SSB (SS / PBCH Block) composed of a synchronization signal (SS: Synchronization Signal) and a downlink physical broadcast channel (PBCH: Physical Broadcast CHannel) is used. The layer 3 measurement (L3 measurement) by the terminal (User Equipment, UE) is specified.

In 3GPP Release 16, L3 measurement using a downlink reference signal for channel state measurement, specifically, CSI-RS (Channel State Information RS), is also being studied (Non-Patent Document 1).

For example, the measurement period applied to the CSI-RS-based L3 measurement (Inter-frequency measurement with measurement gaps) in Frequency Range 2 (FR2: 24.25 GHz to 52.6 GHz) has been agreed.

In 3GPP, it is also considered to extend the above-mentioned measurement cycle by using a scaling factor.

However, when the UE performs a CSI-RS-based L3 measurement, it has something in common with the CSI-RS, specifically the Quasi-Colocation (QCL) -Type D (spatial Rx parameter). Since it is not realistic for the network to constantly keep track of the number of SSBs (which may be called associated SSBs) or the number of neighboring cells in a common) relationship, it is desirable to set the scaling factor to a fixed value. ..

On the other hand, from the viewpoint of UE mobility, it is desirable that the measurement cycle (measurement delay) is short.

Therefore, the following disclosure was made in view of such a situation, and the measurement cycle of the appropriate layer 3 measurement according to the reception state of the downlink reference signal such as CSI-RS or the state of the neighboring cell is set. The purpose is to provide a terminal that can be set.

One aspect of the present disclosure is a receiving unit (control signal / reference signal processing unit 220) that receives a downlink reference signal for channel state measurement, and a control unit that executes layer 3 measurement using the downlink reference signal (control signal / reference signal processing unit 220). With a control unit 240), the control unit is a terminal (UE200) that changes a coefficient applied to the measurement cycle of the layer 3 measurement based on the reception state of the downlink reference signal or the state of a neighboring cell. be.

FIG. 1 is an overall schematic configuration diagram of the wireless communication system 10. FIG. 2 is a diagram showing a schematic operation example of quality measurement by UE200. FIG. 3 is a functional block configuration diagram of the UE 200. FIG. 4 is a diagram showing an example of the Measurement period applied to the inter-frequency measurement with measurement gaps of FR2. FIG. 5 is a diagram showing a QCL-Type between signals applied between a source (parent) and a target (child). FIG. 6 is a diagram showing a QCL-Type between signals applied between a source (parent) and a target (child). FIG. 7 is a diagram showing a setting operation flow of the scaling factor N of the UE 200 according to the operation example 1. FIG. 8 is a diagram showing a setting operation flow of the scaling factor N of the UE 200 according to the operation example 2. FIG. 9 is a diagram showing an example of the hardware configuration of gNB100A, gNB100B and UE200.

Hereinafter, embodiments will be described based on the drawings. The same functions and configurations are designated by the same or similar reference numerals, and the description thereof will be omitted as appropriate.

(1) Overall Schematic Configuration of Wireless Communication System FIG. 1 is an overall schematic configuration diagram of the wireless communication system 10 according to the present embodiment. The wireless communication system 10 is a wireless communication system according to 5G New Radio (NR), and includes a Next Generation-Radio Access Network 20 (hereinafter, NG-RAN20, and a user terminal 200 (hereinafter, UE200)). ..

The wireless communication system 10 may be a wireless communication system according to a method called Beyond 5G, 5G Evolution, or 6G.

NG-RAN20 includes a radio base station 100A (hereinafter, gNB100A) and a radio base station 100B (hereinafter, gNB100B). The specific configuration of the wireless communication system 10 including the number of gNBs and UEs is not limited to the example shown in FIG.

NG-RAN20 actually includes multiple NG-RANNodes and is connected to a core network (5GC, not shown) according to 5G. In addition, NG-RAN20 and 5GC may be simply expressed as "network".

GNB100A and gNB100B are radio base stations according to NR (may be simply called base stations), and execute wireless communication according to UE200 and NR. gNB100A, gNB100B and UE200 are Massive MIMO that generates a beam with higher directivity by controlling radio signals transmitted from multiple antenna elements, and carrier aggregation (CA) that uses multiple component carriers (CC) in a bundle. ), And dual connectivity (DC) that communicates between the UE and multiple NG-RAN Nodes at the same time.

The wireless communication system 10 supports a plurality of frequency ranges, specifically, FR1 and FR2. The frequency band of each FR is as follows.

・ FR1: 410 MHz to 7.125 GHz
・ FR2: 24.25 GHz to 52.6 GHz
FR1 uses a Sub-Carrier Spacing (SCS) of 15, 30 or 60 kHz and may use a bandwidth (BW) of 5-100 MHz. FR2 has a higher frequency than FR1, and SCS of 60 or 120 kHz (240 kHz may be included) is used, and a bandwidth (BW) of 50 to 400 MHz may be used.

Further, the wireless communication system 10 may support a higher frequency band than the frequency band of FR2. Specifically, the wireless communication system 10 can support a frequency band exceeding 52.6 GHz and up to 114.25 GHz. In this case, a wider SCS (eg, 480 kHz, 960 kHz) may be used.

The wireless communication system 10 supports measurements at layers 1 and 3. Specifically, the measurement of the reception quality in the layer 1 and the measurement of the reception quality in the layer 3 are supported.

Layer 1 may be interpreted as including a lower layer such as a physical layer. Layer 3 is a layer higher than layer 1. The higher layer may include at least one of a radio link control layer (RLC), a packet data convergence protocol layer (PDCP), a radio resource control layer (RRC), and a medium access control layer (MAC). ) May be positioned between the lower layer and the upper layer.

In addition, the wireless communication system 10 supports layer 3 measurement using a synchronization signal block or a downlink reference signal.

The synchronization signal block may mean an SSB (SS / PBCH Block) composed of a synchronization signal (SS: Synchronization Signal) and a downlink physical broadcast channel (PBCH: Physical Broadcast CHannel).

The SSB is mainly transmitted from the network periodically in order for the UE200 to execute cell ID and reception timing detection at the start of communication. In NR, SSB is also used to measure the reception quality of each cell. As the transmission cycle (periodicity) of SSB, 5, 10, 20, 40, 80, 160 milliseconds and the like may be specified. The initial access UE200 may be assumed to have a transmission cycle of 20 milliseconds.

SS is composed of a primary synchronization signal (PSS: Primary SS) and a secondary synchronization signal (SSS: Secondary SS).

PSS is a known signal that the UE200 first attempts to detect in the cell search procedure. The SSS is a known signal transmitted to detect the physical cell ID in the cell search procedure.

After detecting an SS / PBCH Block, PBCH has a radio frame number (SFN: SystemFrameNumber) and an index for identifying the symbol positions of multiple SS / PBCH Blocks in a half frame (5 milliseconds). Contains the information necessary for the UE200 to establish frame synchronization with the NR cell formed by gNB100A (or gNB100B, the same below).

The PBCH can also include system parameters required to receive system information (SIB). Further, the SSB also includes a reference signal for demodulation of the broadcast channel (DMRS for PBCH). DMRS for PBCH is a known signal transmitted to measure the radio channel state for PBCH demodulation.

The downlink reference signal may mean a reference signal (RS) in the downlink (DL) direction, but in the present embodiment, in particular, a downlink reference signal for measuring the channel state, specifically, CSI-. It may mean RS (Channel State Information RS).

CSI-RS is a reference signal transmitted to measure the state of a radio channel (which may simply be called a channel), and is specifically used to estimate channel state information. The wireless communication system 10 supports L3 measurement using CSI-RS.

The UE200 can compare multiple SS / PBCH blocks and L1-RSRP (Reference Signal Received Power) and / or L3-RSRP of CSI-RS, and select an appropriate transmission beam. The UE200 can notify the gNB100A of the information of the selected transmission beam.

FIG. 2 shows a schematic operation example of quality measurement by UE200. Specifically, FIG. 2 shows an image of quality measurement operation when UE200 uses FR2.

As shown in Fig. 2, in FR2, UE200 executes measurement (sweeping) while switching the received (Rx) beam (# 1, # 2, ... # n). For this reason, in the case of FR2, regulations such as measurement delay are relaxed compared to FR1.

The UE200 measures the reception quality (RSRP, etc.) of a cell (serving cell and neighboring cells may be included) using a measurement target signal (SSB, etc.) within the measurement period.

For example, if the number of measurement samples required to satisfy the measurement error regulation is 3 samples, it is defined as 3 × reception beam.

(2) Functional block configuration of the wireless communication system Next, the functional block configuration of the wireless communication system 10 will be described. Specifically, the functional block configuration of UE200 will be described.

FIG. 3 is a functional block configuration diagram of UE200. As shown in FIG. 3, the UE 200 includes a wireless communication unit 210, a control signal / reference signal processing unit 220, a quality measurement unit 230, and a control unit 240.

The wireless communication unit 210 sends and receives wireless signals according to NR. Specifically, the wireless communication unit 210 transmits an uplink signal (UL signal) according to NR and receives a downlink signal (DL signal) according to NR.

The wireless communication unit 210 supports Massive MIMO, CA that bundles multiple CCs, and DC that communicates between UE and each of the two NG-RAN Nodes at the same time.

The control signal / reference signal processing unit 220 executes processing related to various control signals transmitted / received by the UE 200 and processing related to various reference signals transmitted / received by the UE 200.

Specifically, the control signal / reference signal processing unit 220 receives various control signals transmitted from the gNB 100A via a predetermined control channel, for example, control signals of the radio resource control layer (RRC). Further, the control signal / reference signal processing unit 220 transmits various control signals to the gNB100A via a predetermined control channel.

The control signal / reference signal processing unit 220 executes processing using a reference signal (RS) such as Demodulation Reference Signal (DMRS) and Phase Tracking Reference Signal (PTRS).

DMRS is a reference signal (pilot signal) known between the base station and the terminal of each terminal for estimating the fading channel used for data demodulation. PTRS is a terminal-specific reference signal for the purpose of estimating phase noise, which is a problem in high frequency bands.

In addition to DMRS and PTRS, the reference signal may include ChannelStateInformation-ReferenceSignal (CSI-RS), SoundingReferenceSignal (SRS), PositioningReferenceSignal (PRS) for position information, and the like. ..

In particular, in the present embodiment, the control signal / reference signal processing unit 220 can receive the CSI-RS, that is, the downlink reference signal for channel state measurement, and execute the processing of the downlink reference signal. In the present embodiment, the control signal / reference signal processing unit 220 constitutes a receiving unit that receives the downlink reference signal.

The channel may include a control channel and a data channel. Control channels include PDCCH (Physical Downlink Control Channel), PUCCH (Physical Uplink Control Channel), RACH (Random Access Channel, Random Access Radio Network Temporary Identifier (RA-RNTI), Downlink Control Information (DCI)), and Physical. Broadcast Channel (PBCH) etc. may be included.

The data channels include PDSCH (Physical Downlink Shared Channel) and PUSCH (Physical Uplink Shared Channel). Data may mean data transmitted over a data channel.

NR's CSI-RS may include the following components.

・ CQI (Channel Quality Information)
・ PMI (Precoding Matrix Indicator)
・ CRI (CSI-RS Resource Indicator)
・ SSB RI (SS / PBCH Resource Block Indicator)
・ LI (Layer Indicator)
・ RI (Rank Indicator)
・ L1-RSRP
・ L3-RSRP, RSRQ (Reference Signal Received Quality), SINR (Signal-to-Interference plus Noise power Ratio)
Further, CSI-RS may be periodic or aperiodic.

The quality measuring unit 230 measures the reception quality of the serving cell of the UE 200 and the neighboring cell (neighbor cell) formed in the vicinity of the serving cell.

Specifically, the quality measurement unit 230 can measure the reception quality using SSB, CSI-RS, or the like. As mentioned above, the reception quality may include at least one of RSRP, RSRQ and SINR.

RSRP is the reception level of the reference signal measured in the UE200, and RSRQ is the reception quality of the reference signal measured in the UE200 (the ratio of the power of the cell-specific reference signal to the total power within the receive bandwidth). Can be interpreted).

In the measurement of SSB, a measurement window called SSB based RRM Measurement Timing Configuration (SMTC), which can be set for each carrier (may be called a subcarrier), may be used. Specifically, the SMTC window is available from the network (gNB100A) because when the UE200 performs reception quality measurement using SSB, the UE200 recognizes the measurement start timing, measurement period, and measurement cycle for each cell to be measured. It may be interpreted as a measurement window set on the UE200.

In addition, the quality measurement unit 230 can execute L3 measurement using CSI-RS (downlink reference signal) according to the control by the control unit 240. Specifically, the quality measuring unit 230 may measure RSRP, RSRQ and SINR described above by using the function of layer 3.

The control unit 240 controls each functional block constituting the UE 200. In particular, in this embodiment, the control unit 240 can perform layer 3 measurement using CSI-RS (downlink reference signal). Specifically, the control unit 240 controls the quality measurement unit 230 and executes L3 measurement using CSI-RS.

The control unit 240 may change the coefficient applied to the measurement period of L3 measurement based on the reception state of CSI-RS or the state of neighboring cells.

The coefficient may be any one that can change the measurement period, but it is particularly desirable that the coefficient can be expanded (scaled) from the reference Measurement period (which may be interpreted as the measurement time). The coefficient may be referred to as a scaling factor (N).

For example, the control unit 240 can change the scaling factor N that extends the measurement period in the inter-frequency measurement with measurement gaps of FR2 specified in 3GPP TS38.133 Section 9.

The target to which the scaling factor N (see FIG. 4) is applied may be FR1 instead of FR2. The scaling factor N may be based on the number of measurement samples or other numerical values. A specific application example of the scaling factor N will be described later.

The control unit 240 may set a fixed value or a scaling factor N according to the number of SSBs based on the number of SSBs (synchronous signal blocks) having a commonality between the CSI-RS and the received beam.

Here, the SSB having the commonality of the received beam may be interpreted as the SSB having the relationship between the CSI-RS to be measured and the QCL Type D (Spatial Rx parameter is common). Such an SSB may be called an associated SSB. The relationship between the reference signal and the QCL (Quasi-Colocation) will be described later.

Further, the scaling factor N according to the number of SSBs may be the same number as the associated SSB or may be different, and may be linked to the number of associated SSBs with a certain relationship.

The fixed value (x) is not particularly limited, but a value (for example, x = 8) corresponding to the sweeping rule of the received beam applied to the measurement of SSB may be set. That is, the control unit 240 can set a fixed value corresponding to the sweeping of the received beam applied to the measurement of SSB.

The control unit 240 may set the number of associated SSBs as the scaling factor N when the number of associated SSBs is a fixed value or less. For example, when the fixed value x = 8 and the number of associated SSBs = 4, 4 (Rx beam sweeping) may be set as the scaling factor N.

Further, the control unit 240 may set a fixed value or a scaling factor N according to the number of neighboring cells based on the number of neighboring cells. Specifically, like the associated SSB, the scaling factor N according to the number of neighboring cells may be the same number as the neighboring cells or may be different, and has a certain relationship with the neighboring cells. It suffices if it is linked with the number.

Similarly to the associated SSB, the control unit 240 may set the number of neighboring cells as the scaling factor N when the number of neighboring cells is a fixed value or less.

(3) Operation of wireless communication system Next, the operation of the wireless communication system 10 will be described. Specifically, the operation related to the CSI-RS-based L3 measurement, particularly the operation related to the control of the scaling factor N provided for the L3 measurement will be described.

(3.1) Premise First, as a premise, the basic operation of CSI-RS-based L3 measurement and related contents will be explained.

(3.1.1) CSI-RS-based L3 measurement
As a CSI-RS-based L3 measurement, as described above, RSRP, RSRQ and SINR measurements may be performed as reception quality.

UE200 needs to perform handover and addition of CC at the time of CA while maintaining communication quality. Therefore, the UE200 measures the reception quality of its own cell and other cells (neighboring cells) in advance and reports it to the network. This allows the network to perform better control of the UE200.

In NR (3GPP Release 15), UE200 can be measured using the SSB transmitted in the measurement target cell. As described above, SMTC, a measurement window that can be set for each carrier, is used for SSB measurement.

In addition, in the reception quality measurement of other cells / CCs, the measurement is executed in Measurement Gap. Measurement Gap may be interpreted as a measurement window for stopping data transmission / reception of the own cell and measuring cells / CC of different frequencies.

In addition, 3GPP Release 16 will introduce CSI-RS-based L3 measurement. Compared to SSB, CSI-RS-based L3 measurement can be set more flexibly, so more configurable L3 measurement can be expected.

Possible parameters include, for example, the frequency position, bandwidth, and density of CSI-RS (the number of CSI-RSs arranged per resource block (RB)).

Regarding such CSI-RS-based L3 measurement, for example, the measurement period in the inter-frequency measurement with measurement gaps of FR2 has been agreed. FIG. 4 shows an example of the Measurement period applied to the inter-frequency measurement with measurement gaps of FR2.

It has also been agreed that the parameter M _{meas_period_inter} shown in FIG. 4 shall be as follows.

・ For a UE supporting FR2 power class 1, M _{meas_period_inter} = 8xN samples
・ For a UE supporting FR2 power class 2, M _{meas_period_inter} = 5xN samples
・ For a UE supporting FR2 power class 3, M _{meas_period_inter} = 5xN samples
・ For a UE supporting FR2 power class 4, M _{meas_period_inter} = 5xN samples
CSSF _inter is a carrier-specific scaling factor, and the measurements performed within the Measurement Gap may be determined according to CSSF _{within_gap, i} specified in Section 3GPP TS38.133 9.1.5. The power class (PC) is specified in 3GPP TS38.101-2 and so on.

In the operation example described later, the value of the scaling factor N is controlled according to the number of associated SSBs (or neighboring cells).

(3.1.2) Pseudo-collocation (QCL)
In 3GPP, when the radio parameters can be considered to be the same between two signals, the QCL is specified to show the relationship between the signals.

The two signals in the QCL relationship have a relationship such as source (parent) and target (child).

In NR, the following four types of QCL are supported, and the radio parameters included in each QCL-Type are sometimes called QCL parameters.

・ QCL-Type A: {Doppler shift, Doppler spread, average delay, delay spread}
・ QCL-Type B: {Doppler shift, Doppler spread}
・ QCL-Type C: {Doppler shift, average delay}
・ QCL-Type D: {Spatial Rx parameter}
Type A to C are QCL information related to time / frequency synchronization processing, and Type-D is QCL information related to beam control. In NR, the source signal information is notified to a certain signal. The applicability of QCL-Type between signals is specified in 3GPP TS38.214.

5 and 6 show the QCL-Type between the signals applied between the source (parent) and the target (child).

As shown in FIGS. 5 and 6, for example, the CSI-RS has the same or different types of reference signals, or the relationship between SSB and QCL.

(3.1.3) Problem From the viewpoint of scheduling by the network, it is not realistic to constantly grasp the number of neighboring cells or associated SSB due to the increase in load, so the above-mentioned scaling factor N should be a fixed value. Is desirable.

On the other hand, from the viewpoint of UE mobility, it is desirable that the measurement period (measurement delay) is short because it is desirable to avoid taking time for measurement.

Considering such a situation, it is desirable to dynamically change the scaling factor N according to the reception status of UE200.

(3.2) Operation example The following describes an operation example in which the scaling factor N is dynamically changed. Specifically, an operation example of changing the scaling factor N according to the number of associated SSBs or the number of neighboring cells will be described.

(3.2.1) Operation example 1
In this operation example, the scaling factor N is changed according to the number of associated SSBs. Specifically, the scaling factor N may be changed according to the following rules.

・ Min of (the number of different associatedSSB, x)
Here, min means that the smaller of the number of different associated SSBs and the fixed value (x) is selected.

Specifically, when the number of associatedSSBs is x or more, N = x may be set. That is, by limiting the number of associated SSBs to be detected, it is possible to prevent the measurement delay from being unnecessarily delayed. In addition, since scheduling with a fixed value is possible from the viewpoint of the network, it is possible to avoid complicated scheduling.

On the other hand, if the number of associatedSSBs is x or less, the number of N = associatedSSBs may be set. That is, the UE200 can reduce the measurement delay by performing beam sweeping for the number of associated SSBs required for CSI-RS measurement.

As described above, the value of x may be 8 (a value corresponding to the sweeping rule of the received beam when measuring the current SSB) or may be a different value.

FIG. 7 shows a setting operation flow of the scaling factor N of the UE 200 according to the operation example 1. As shown in FIG. 7, the UE200 acquires an associated SSB, that is, the number of SSBs having a relationship between CSI-RS and QCL-Type D (S10).

UE200 determines whether the number of associated SSBs is a fixed value (x) (S20). It should be noted that the determination may be made by the number of associated SSBs ≥ x, or the determination may be made by the number of associated SSBs> x.

When the number of associatedSSBs is x or more, UE200 sets a fixed value (x) as the scaling factor N (S30).

On the other hand, if the number of associatedSSBs is less than x, UE200 sets the number of associatedSSBs as the scaling factor N (S40).

(3.2.2) Operation example 2
In this operation example, the scaling factor N is changed according to the number of neighboring cells. Hereinafter, the parts different from the operation example 1 will be described.

FIG. 8 shows a setting operation flow of the scaling factor N of the UE 200 according to the operation example 2. As shown in FIG. 8, UE200 acquires the number of neighboring cells of UE200 (S110). The neighboring cell may be interpreted as a cell formed in the vicinity of the serving cell (which may include overlapping cases) and to be measured by the UE 200.

UE200 determines whether the number of neighboring cells is a fixed value (x) (S120). It should be noted that the determination may be made by the number of neighboring cells ≧ x, or the determination may be made by the number of neighboring cells> x. Further, the value of x may be the same as or different from the case of operation example 1 (for example, 8).

When the number of neighboring cells is x or more, UE200 sets a fixed value (x) as the scaling factor N (S130).

On the other hand, if the number of neighboring cells is less than x, UE200 sets the number of neighboring cells as the scaling factor N (S140).

(3.2.3) Modification example The above-mentioned operation example 1 and operation example 2 may be modified as follows. For example, the UE 200 may set the smallest value among the number of associated SSBs, the number of neighboring cells, and the fixed value (x) as the scaling factor N.

If the number of associated SSBs and the number of neighboring cells are the same or similar within a predetermined range, either the number of associated SSBs or the number of neighboring cells may be preferentially set. good.

Further, also in the operation example 1 and the operation example 2, if the number of associated SSBs, the number of neighboring cells, and the fixed value (x) are similar within a predetermined range, either one (the number of associated SSBs) is used. Either one of the fixed values, or the number of neighboring cells and one of the fixed values) may be set preferentially.

(4) Action / Effect According to the above-described embodiment, the following action / effect can be obtained. Specifically, the UE200 can change the scaling factor N applied to the measurement period of L3 measurement based on the reception status of CSI-RS or the status of neighboring cells.

As mentioned above, from the viewpoint of scheduling by the network, it is desirable to set the scaling factor N to a fixed value, and from the viewpoint of UE mobility, it is desirable that the measurement period (measurement delay) is short, but according to UE200, scaling Since factor N can be dynamically changed according to the reception status of UE200, a more appropriate CSI-RS-based L3 measurement measurement period can be set.

In the present embodiment, the UE 200 can set a fixed value or a scaling factor N according to the number of associated SSBs based on the number of associated SSBs having a commonality between the CSI-RS and the received beam. Therefore, it is possible to set a more appropriate measurement period of CSI-RS-based L3 measurement according to the state of UE200.

In this embodiment, when the number of associated SSBs is less than or equal to a fixed value, the number of associated SSBs can be set as the scaling factor N. Therefore, it is possible to set an appropriate CSI-RS-based L3 measurement Measurement period according to the number of associated SSBs.

In this embodiment, the UE 200 can set a fixed value corresponding to the sweeping of the received beam applied to the measurement of SSB. Therefore, it is possible to set a more appropriate measurement period of CSI-RS-based L3 measurement according to the state of UE200.

Further, in the present embodiment, the UE 200 can also set a fixed value or a scaling factor N according to the number of neighboring cells based on the number of neighboring cells. Therefore, it is possible to set a more appropriate measurement period of CSI-RS-based L3 measurement according to the state of UE200.

In the present embodiment, the UE 200 may set the number of neighboring cells as the scaling factor N when the number of neighboring cells is a fixed value or less. Therefore, it is possible to set an appropriate CSI-RS-based L3 measurement Measurement period according to the number of neighboring cells.

(5) Other Embodiments Although the embodiments have been described above, it is obvious to those skilled in the art that various modifications and improvements are possible without limitation to the description of the embodiments.

For example, in the above-described embodiment, an example of setting the measurement period of the CSI-RS-based L3 measurement as the downlink reference signal for channel state measurement has been described, but as long as the downlink reference signal for channel state measurement is used. In, the name of the specific reference signal may be different from that of CSI-RS.

Further, in the above-described embodiment, an example of dynamically changing the scaling factor N applied to the measurement period has been described, but it is applied not to the measurement period but to a period related to other measurements (for example, measurement gap or measurement delay). The Measurement period may be changed directly or indirectly by changing the coefficient to be applied.

Further, the block configuration diagram (FIG. 3) used in the description of the above-described 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 using one physically or logically coupled device, or two or more physically or logically separated devices can be directly or indirectly (eg, for example). , 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.

Functions include judgment, decision, judgment, calculation, calculation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, solution, selection, selection, establishment, comparison, assumption, expectation, and assumption. Broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc., but limited to these I can't. For example, a functional block (configuration unit) that makes transmission function is called a transmitting unit (transmitting unit) or a transmitter (transmitter). In each case, as described above, the realization method is not particularly limited.

Further, the above-mentioned gNB100A, gNB100B and UE200 (the device) may function as a computer for processing the wireless communication method of the present disclosure. FIG. 9 is a diagram showing an example of the hardware configuration of the device. As shown in FIG. 9, the device may be 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 following explanation, the word "device" can be read as a circuit, device, unit, etc. The hardware configuration of the device may be configured to include one or more of each of the devices shown in the figure, or may be configured not to include some of the devices.

Each functional block of the device (see FIG. 3) is realized by any hardware element of the computer device or a combination of the hardware elements.

In addition, each function in the device is such that the processor 1001 performs an operation by loading predetermined software (program) on the hardware such as the processor 1001 and the memory 1002, and controls the communication by the communication device 1004, or the memory. It is realized by controlling at least one of reading and writing of data in 1002 and storage 1003.

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, a register, and the like.

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. Further, the various processes described above may be executed by one processor 1001 or may be executed simultaneously or sequentially by two or more processors 1001. Processor 1001 may be implemented by one or more chips. The program may be transmitted from the network via a telecommunication line.

The memory 1002 is a computer-readable recording medium, and is composed of at least one such as ReadOnlyMemory (ROM), ErasableProgrammableROM (EPROM), Electrically ErasableProgrammableROM (EEPROM), and RandomAccessMemory (RAM). May be done. 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 execute the method according to the embodiment of the present disclosure.

The storage 1003 is a computer-readable recording medium, for example, an optical disk such as Compact Disc ROM (CD-ROM), a hard disk drive, a flexible disk, an optical magnetic disk (for example, a compact disk, a digital versatile disk, or a Blu-ray). It may consist of at least one (registered trademark) disk), smart card, flash memory (eg, card, stick, key drive), floppy (registered trademark) disk, magnetic strip, and the like. Storage 1003 may be referred to as auxiliary storage. The recording medium described above may be, for example, a database, server or other suitable medium containing at least one of the memory 1002 and the storage 1003.

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 (FDD) and time division duplex (TDD). It may be composed of.

The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that accepts an input from the outside. The output device 1006 is an output device (for example, a display, a speaker, an 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).

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

Furthermore, the device includes hardware such as a microprocessor, a digital signal processor (Digital Signal Processor: DSP), an ApplicationSpecific Integrated Circuit (ASIC), a ProgrammableLogicDevice (PLD), and a FieldProgrammableGateArray (FPGA). The hardware may implement some or all of each functional block. For example, processor 1001 may be implemented using at least one of these hardware.

Further, the notification of information is not limited to the embodiment / embodiment described in the present disclosure, and may be performed by using another method. For example, information notification includes physical layer signaling (eg Downlink Control Information (DCI), Uplink Control Information (UCI), higher layer signaling (eg RRC signaling, Medium Access Control (MAC) signaling, Master Information Block). (MIB), System Information Block (SIB)), other signals or combinations thereof. RRC signaling may also be referred to as an RRC message, eg, RRC Connection Setup. ) Message, RRC Connection Reconfiguration message, etc. may be used.

Each aspect / embodiment described in the present disclosure includes LongTermEvolution (LTE), LTE-Advanced (LTE-A), SUPER3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system ( 5G), FutureRadioAccess (FRA), NewRadio (NR), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, UltraMobileBroadband (UMB), IEEE802.11 (Wi-Fi (registered trademark)) , IEEE802.16 (WiMAX®), IEEE802.20, Ultra-WideBand (UWB), Bluetooth®, and other systems that utilize appropriate systems and at least one of the next-generation systems extended based on them. It may be applied to one. In addition, a plurality of systems may be applied in combination (for example, a combination of at least one of LTE and LTE-A and 5G).

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.

In some cases, the specific operation performed by the base station in this disclosure may be performed by its upper node (upper node). In a network consisting of one or more network nodes having a base station, various operations performed for communication with the terminal are the base station and other network nodes other than the base station (eg, MME or). It is clear that it can be done by at least one of (but not limited to, S-GW, etc.). Although the case where there is one network node other than the base station is illustrated above, it may be a combination of a plurality of other network nodes (for example, MME and S-GW).

Information and signals (information, etc.) can be output from the upper layer (or lower layer) to the lower layer (or upper layer). Input / output may be performed via a plurality of network nodes.

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

The determination may be made by a value represented by 1 bit (0 or 1), by a boolean value (Boolean: true or false), or by comparing numerical values (for example, a predetermined value). It may be done by comparison with the value).

Each aspect / embodiment described in the present disclosure may be used alone, in combination, or may be switched and used according to the execution. Further, the notification of predetermined information (for example, the notification of "being X") is not limited to the explicit one, but is performed implicitly (for example, the notification of the predetermined information is not performed). May be good.

Software, whether called software, firmware, middleware, microcode, hardware description language, or other names, instructions, instruction sets, codes, code segments, program codes, programs, subprograms, software modules. , Applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, features, etc. should be broadly interpreted.

Further, software, instructions, information, etc. may be transmitted and received via a transmission medium. For example, a website, where the software uses at least one of wired technology (coaxial cable, fiber optic cable, twisted 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 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.

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, at least one of a channel and a symbol may be a signal (signaling). Also, the signal may be a message. Further, the component carrier (CC) may be referred to as a carrier frequency, a cell, a frequency carrier, or the like.

The terms "system" and "network" used in this disclosure are used interchangeably.

Further, the information, parameters, etc. described in the present disclosure may be expressed using an absolute value, a relative value from a predetermined value, or another corresponding information. It may be represented. For example, the radio resource may be one indicated by an index.

The names used for the above parameters are not limited in any respect. Further, mathematical formulas and the like using these parameters may differ from those expressly disclosed in this disclosure. Since various channels (eg, 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 in any respect limited names. is not.

In this disclosure, "Base Station (BS)", "Wireless Base Station", "Fixed Station", "NodeB", "eNodeB (eNB)", "gNodeB (gNB)", " "Access point", "transmission point", "reception point", "transmission / reception point", "cell", "sector", "cell group", " Terms such as "carrier" and "component carrier" may be used interchangeably. Base stations are sometimes referred to by terms such as macrocells, small cells, femtocells, and picocells.

A base station can accommodate one or more (eg, three) cells (also called sectors). When a base station accommodates multiple cells, the entire base station coverage area can be divided into multiple smaller areas, each smaller area being a base station subsystem (eg, a remote radio for indoor use). Communication services can also be provided by Head: RRH).

The term "cell" or "sector" refers to a base station that provides communication services in this coverage, and part or all of the coverage area of at least one of the base station subsystems.

In the present disclosure, terms such as "Mobile Station (MS)", "user terminal", "user equipment (UE)", and "terminal" may be used interchangeably. ..

Mobile stations can be used by those skilled in the art as 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. It may also be referred to as a terminal, remote terminal, 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 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, a 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 a base station and a 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 as a mobile station (user terminal, the same shall apply hereinafter). For example, communication between a base station and a mobile station has been replaced with communication between a plurality of mobile stations (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 mobile station may have the functions of the base station. Further, words such as "up" and "down" may be read as words corresponding to communication between terminals (for example, "side"). For example, the upstream channel, the downstream channel, and the like may be read as a side channel.

Similarly, the mobile station in the present disclosure may be read as a base station. In this case, the base station may have the functions of the mobile station.
The radio frame may be composed of one or more frames in the time domain. Each one or more frames in the time domain may be referred to as a subframe. Subframes may further be composed of one or more slots in the time domain. The subframe may have a fixed time length (eg, 1 ms) that does not depend on numerology.

The numerology may be a communication parameter that applies to at least one of the transmission and reception of a signal or channel. Numerology includes, for example, SubCarrier Spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (Transmission Time Interval: TTI), number of symbols per TTI, wireless frame configuration, transmission / reception. It may indicate at least one of a specific filtering process performed by the machine in the frequency domain, a specific windowing process performed by the transmitter / receiver in the time domain, and the like.

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

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

Wireless frames, subframes, slots, mini slots and symbols all represent time units when transmitting signals. The radio frame, subframe, slot, minislot and symbol may use different names corresponding to each.

For example, one subframe may be referred to as a transmission time interval (TTI), a plurality of consecutive subframes may be referred to as TTI, and one slot or one minislot may be referred to as TTI. That is, at least one of the subframe and TTI may be a subframe (1ms) in existing LTE, a period shorter than 1ms (eg, 1-13 symbols), or a period longer than 1ms. 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 an LTE system, a base station schedules each user terminal to allocate wireless 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.

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.

TTI with a time length of 1 ms may be called normal TTI (TTI in LTE Rel.8-12), normal TTI, long TTI, normal subframe, normal subframe, long subframe, slot, etc. A TTI shorter than a normal TTI may be referred to as a shortened TTI, a short TTI, a partial TTI (partial or fractional TTI), a shortened subframe, a short subframe, a minislot, a subslot, a slot, 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.) may be read as a TTI less than the TTI length of the long TTI and 1 ms. It may be read as a TTI having the above TTI length.

The 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 RB may be the same regardless of numerology, and may be, for example, 12. The number of subcarriers contained in the RB may be determined based on numerology.

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

One or more RBs are physical resource blocks (Physical RB: PRB), sub-carrier groups (Sub-Carrier Group: SCG), resource element groups (Resource Element Group: REG), PRB pairs, RB pairs, etc. May be called.

Further, the resource block may be composed of one or a plurality of resource elements (ResourceElement: 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) may represent a subset of consecutive common resource blocks for a neurology in a carrier. 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.

BWP may include BWP for UL (UL BWP) and BWP for DL (DL BWP). 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".

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 radio frame, the number of slots per subframe or radioframe, the number of minislots contained within a slot, the number of symbols and RBs contained in a slot or minislot, included in RB. The number of subcarriers, as well as the number of symbols in the TTI, the symbol length, the cyclic prefix (CP) length, and other configurations can be changed in various ways.

The terms "connected", "coupled", or any variation thereof, mean any direct or indirect connection or connection between two or more elements and each other. It can include the presence of one or more intermediate elements between two "connected" or "joined" elements. The connection or connection between the elements may be physical, logical, or a combination thereof. For example, "connection" may be read as "access". As used in the present disclosure, the two elements use at least one of one or more wires, cables and printed electrical connections, and, as some non-limiting and non-comprehensive examples, the radio frequency domain. Can be considered to be "connected" or "coupled" to each other using electromagnetic energy having wavelengths in the microwave and light (both visible and invisible) regions.

The reference signal can also be abbreviated as Reference Signal (RS), and may be called a pilot (Pilot) depending on the applied standard.

The statement "based on" 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".

The "means" in the configuration of each of the above devices may be replaced with a "part", a "circuit", a "device", or the like.

Any reference to elements using designations such as "first" and "second" 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. Therefore, references to the first and second elements do not mean that only two elements can be adopted there, or that the first element must somehow precede the second element.

When "include", "including" and variations thereof are used in the present disclosure, these terms are as inclusive as the term "comprising". Is intended. Moreover, the term "or" used in the present disclosure is intended to be non-exclusive.

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

The terms "determining" and "determining" used in this disclosure may include a wide variety of actions. "Judgment" and "decision" are, for example, judgment (judging), calculation (calculating), calculation (computing), processing (processing), derivation (deriving), investigation (investigating), search (looking up, search, inquiry). It may include (eg, searching in a table, database or another data structure), ascertaining as "judgment" or "decision". Also, "judgment" and "decision" are receiving (for example, receiving information), transmitting (for example, transmitting information), input (input), output (output), and access. It may include (for example, accessing data in memory) to be regarded as "judgment" or "decision". In addition, "judgment" and "decision" are considered to be "judgment" and "decision" when the things such as solving, selecting, choosing, establishing, and comparing are regarded as "judgment" and "decision". Can include. That is, "judgment" and "decision" may include considering some action as "judgment" and "decision". Further, "judgment (decision)" may be read as "assuming", "expecting", "considering" 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".

Although the present disclosure has been described in detail above, it is clear to those skilled in the art that the present disclosure is not limited to the embodiments described in the present disclosure. The present disclosure may be implemented as amendments and modifications without departing from the spirit and scope of the present disclosure as determined by the description of the scope of claims. Therefore, the description of this disclosure is for purposes of illustration and does not have any limiting meaning to this disclosure.

10 Radio communication system 20 NG-RAN
100A, 100B gNB
200 UE
210 Wireless communication unit 220 Control signal / reference signal processing unit 230 Quality measurement unit 240 Control unit 1001 Processor 1002 Memory 1003 Storage 1004 Communication device 1005 Input device 1006 Output device 1007 Bus

Claims

A receiver that receives the downlink reference signal for channel status measurement, and
A control unit that executes layer 3 measurement using the downlink reference signal is provided.
The control unit is a terminal that changes a coefficient applied to the measurement cycle of the layer 3 measurement based on the reception state of the downlink reference signal or the state of a neighboring cell.
The first aspect of the present invention, wherein the control unit sets a fixed value or the coefficient according to the number of the synchronized signal blocks based on the number of synchronized signal blocks having a commonality between the downlink reference signal and the received beam. Terminal.
The terminal according to claim 2, wherein the control unit sets the number of synchronization signal blocks as the coefficient when the number of synchronization signal blocks is equal to or less than the fixed value.
The terminal according to claim 2 or 3, wherein the control unit sets the fixed value corresponding to the sweeping of the received beam applied to the measurement of the synchronization signal block.
The terminal according to claim 1, wherein the control unit sets a fixed value or the coefficient according to the number of neighboring cells based on the number of neighboring cells.
The terminal according to claim 5, wherein the control unit sets the number of neighboring cells as the coefficient when the number of neighboring cells is equal to or less than the fixed value.