JP7111856B2 - Terminal, wireless communication method, base station and system - Google Patents

Description

The present invention relates to a terminal , radio communication method, base station and system in a next-generation mobile communication system.

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 (eg, LTE Rel.8-13), the user terminal (UE: User Equipment) detects a synchronization signal (PSS (Primary Synchronization Signal), SSS (Secondary Synchronization Signal)) by cell search, Synchronization with a network (for example, a base station (eNB (eNode B))) is performed, and a connected cell is identified (for example, identified by a cell ID (Identifier)).

Further, after the cell search, the UE, the master information block (MIB: Master Information Block) transmitted on the broadcast channel (PBCH: Physical Broadcast Channel), the system information transmitted on the shared data channel (PDSCH: Physical Downlink Shared Channel) A block (SIB: System Information Block) or the like is received to acquire setting information (also called broadcast information, system information, or the like) for communication with a network.

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

In future radio communication systems (for example, NR), resource units including synchronization signals and broadcast channels are defined as SS blocks (Synchronization Signal blocks), and initial connections are made based on the SS blocks.

Also, it is being considered to perform measurements based on the SS block for cells other than the serving cell. In this case, it is preferable to specify and report which SS block of the other cell was measured. However, identifying the SS blocks of other cells has the problem of increasing the burden on the UE.

Therefore, one object of the present invention is to provide a terminal , a radio communication method, a base station, and a system that can suppress an increase in the processing load of a UE even when performing communication control based on SS blocks.

A terminal according to an aspect of the present invention includes a receiving unit that receives a synchronization signal block including a synchronization signal and a broadcast channel, and information about whether a neighboring cell is synchronized with a serving cell, the neighboring cell is synchronized with the serving cell. a control unit that derives a synchronization signal block index of a synchronization signal block transmitted by the adjacent cell based on the timing of the serving cell when information indicating that the base station is notified of the .

ADVANTAGE OF THE INVENTION According to this invention, even when performing communication control based on SS block, the increase of the processing load of UE can be suppressed.

FIG. 1 is a conceptual explanatory diagram of the SS block. FIG. 2 is a diagram showing an example of specifying SS blocks in the case of a synchronous NW. FIG. 3 is a diagram showing an example of specifying SS blocks in the second embodiment. FIG. 4 is a diagram showing an example of a schematic configuration of a radio communication system according to one embodiment of the present invention. FIG. 5 is a diagram showing an example of the overall configuration of a radio base station according to one embodiment of the present invention. FIG. 6 is a diagram showing an example of the functional configuration of a radio base station according to one embodiment of the present invention. FIG. 7 is a diagram showing an example of the overall configuration of a user terminal according to one embodiment of the present invention. FIG. 8 is a diagram showing an example of the functional configuration of a user terminal according to one embodiment of the present invention. FIG. 9 is a diagram showing an example of hardware configurations of a radio base station and a user terminal according to one embodiment of the present invention.

In future wireless communication systems (for example, LTE Rel. 14, 15 and later, 5G, NR, etc., hereinafter also referred to as NR), resource units including synchronization signals and broadcast channels are defined as SS blocks (Synchronization Signal blocks). , SS blocks are considered.

The SS block will be described with reference to FIG. FIG. 1 is a conceptual explanatory diagram of the SS block. The SS block shown in FIG. 1 is a PSS for NR (NR-PSS), an SSS for NR (NR-SSS) and a It contains at least PBCH (NR-PBCH). Note that the SS block may include a synchronization signal (TSS: Tertiary SS) different from the PSS and SSS.

A collection of one or more SS blocks may be called an SS burst. In this example, the SS burst is composed of a plurality of temporally continuous SS blocks, but is not limited to this. For example, an SS burst may be composed of SS blocks with continuous frequency and/or time resources, or may be composed of SS blocks with non-continuous frequency and/or time resources.

SS bursts are preferably transmitted at predetermined intervals (which may be referred to as SS burst intervals). Alternatively, the SS bursts may not be transmitted periodically (transmitted aperiodically). The SS burst length and/or SS burst period may be transmitted over a period of one or more subframes, one or more slots, and so on.

One or more SS bursts may also be referred to as an SS burst set (SS burst series). For example, a base station (also called BS (Base Station), transmission/reception point (TRP: Transmission/Reception Point), eNB (eNode B), gNB, etc.) and/or UE are included in one SS burst set. Multiple SS blocks may be beam sweeped and transmitted using one or more SS bursts.

Note that the SS burst set is preferably transmitted periodically. The UE may control the reception process assuming that SS burst sets are transmitted periodically (SS burst set periodicity).

NR-PSS and NR-SSS, or NR-PSS (NR-SSS) and NR-PBCH may be time division multiplexed (TDM: Time Division Multiplexing) or frequency division multiplexed (FDM: Frequency Division Multiplexing) may

In NR, the following initial access procedures using SS blocks are being considered. First, the UE detects NR-PSS (step S101). The UE performs rough time and frequency synchronization based on step S101 and identifies the scrambling ID (which may be called local ID) of the NR-SSS transmitted in the NR cell (the cell supporting NR).

Next, the UE detects NR-SSS (step S102). The relative resource locations of NR-PSS and NR-SSS are specified. After completing step S102, the UE can identify the cell ID.

The UE detects and decodes the NR-PBCH (step S103). The relative resource location of NR-PBCH to NR-SSS (or NR-PSS) is specified. Also, the UE can perform channel estimation for decoding the NR-PBCH based on a predetermined reference signal (eg, a demodulation reference signal (DMRS)).

The NR-SSS and NR-PBCH detected in steps S102 and S103 correspond to the same SS block index as the NR-PSS, respectively.

UE, the minimum system information (eg, RMSI (Remaining Minimum System Information), etc. may be called) downlink control channel (eg, control channel for NR (NR-PDCCH (Physical Downlink Control Channel))) is detected and decoded (step S104). Based on the NR-PDCCH, the UE determines the configuration information of the NR-PDSCH that carries the RMSI.

A UE can monitor a given control resource set to detect the NR-PDCCH. Note that the control resource set is a resource set that is a candidate for transmission of the downlink control channel (NR-PDCCH), and includes a control resource set (CORSET: COntrol Resource SET), a control subband (control subband), a control channel search space , search space set, search space resource set, control region, control subband, NR-PDCCH region, and so on. In the present specification, the control resource set is mainly assumed to be the control resource set required for receiving the RMSI, but is not limited to this.

The UE decodes the NR-PDSCH and acquires the RMSI based on the NR-PDSCH configuration information determined in step S104 (step S105). The UE determines at least a Random Access Channel (RACH) configuration based on the RMSI.

The UE performs a random access procedure based on the RACH configuration (step S106).

In NR, operation of a system using a single beam or multiple beams is under consideration. For example, in the case of multi-beam operation, multiple SS blocks may be beam-swept and the entire SS burst set may be periodically and repeatedly transmitted. Also, NR-PSS, NR-SSS and NR-PBCH corresponding to the same SS block index may be transmitted in the same beam.

By the way, in NR, it is being considered that the UE performs not only cell-level measurements but also SS block-level measurements. SS block level measurements are assumed, for example, SS block RSRP measurements and CSI-RS RSRP measurements in connected mode. SS block RSRP (SS block RSRP) is considered to be measured based on NR-SSS (and DMRS for PBCH demodulation). In the case of CSI-RS measurement, it is necessary to confirm the presence or absence of a cell and secure the timing, and it is being considered to obtain cell timing information from the SS block.

The timing information of the SS block may be called, for example, the time index of the SS block. The SS block time index is represented by, for example, an SS burst set index, an SS burst index (within the SS burst set), an SS block index, a symbol index, a slot index, a system frame number, etc., or a combination thereof. good too.

Note that, for example, the same SS block index may be used between SS bursts within the SS burst set, or different indexes may be used for each SS block within the SS burst set.

Also, in NR, measurement of not only the serving cell but also other cells (for example, neighboring cells) of the serving cell is being considered. As described above, RSRP measurement at the SS block level is required even for other cells.

By the way, when reporting the RSRP measurement result of the SS block from the UE to the network, it is conceivable to include information (for example, SS block index) that can identify the SS block in the report. By specifying the SS block corresponding to the report, the network can determine, for example, which beam has better quality from the UE's point of view, and can control beam switching smoothly.

Also, by associating the SS block index with the information specifying the CSI-RS (for example, CSI-RS ID), effective utilization is possible. For example, the network allocates CSI-RS for every cell. The network designates (limits) the CSI-RS to be measured for each UE based on the SS block RSRP and SS block index reported from the UE. According to this configuration, the UE only has to perform the designated CSI-RS measurements, so the load can be reduced.

Thus, the SS block index conveyed using NR-PBCH turns out to be useful information for the network and UE.

However, when obtaining the SS block index from the NR-PBCH included in the SS block of another cell in the UE, it is necessary to decode the NR-PBCH from each SS block for all other cells, so the process in the UE There is the problem of increased delay and burden.

Therefore, the present inventors have studied a method for suppressing a decrease in communication throughput even when performing communication control based on SS blocks, and have arrived at the present invention.

A user terminal of one aspect of the present invention receives at least one or more synchronization signal blocks (referred to as SS blocks) including a synchronization signal and a broadcast channel (referred to as PBCH) from a serving cell, and based on predetermined information, other It is determined whether or not to decode the PBCH included in the SS block of the cell.

According to one aspect of the present invention, whether or not to decode the PBCH included in the SS block of another cell is determined based on predetermined information, so there are cases where the PBCH of the SS block need not be decoded. . In this way, PBCH decoding can be eliminated according to predetermined information, and an increase in processing load on the UE can be suppressed even when communication control based on SS blocks is performed.

In the above aspect, the predetermined information may be an instruction as to whether or not to decode the PBCH included in the SS blocks of other cells. For example, the network notifies the UE whether or not the SS blocks of other cells need not be read. Alternatively, the specifications may predetermine a condition under which the UE does not have to read the SS blocks of other cells. The notification indicating whether or not the SS blocks of other cells need not be read, and the conditions for not reading the SS blocks of other cells defined in the specifications, can be used as instructions as to whether or not the PBCH is to be decoded.

In the above aspects, the UE can use, as the predetermined information, information regarding whether or not other cells to be measured are synchronized with the serving cell. The information may be information explicitly indicating whether or not neighboring cells of the frequency to be measured are synchronized with the serving cell, or other setting information related to whether or not they are synchronized. good too. If the UE knows that other cells are synchronized with the serving cell, it is necessary to demodulate the PBCH to read the timing information (e.g., time index) of the SS block if the synchronization signal of the SS block of the other cell can be detected. can also know the frame and slot boundaries of other cells.

In the above aspect, the UE can use, as the predetermined information, information regarding whether or not the other cell to be measured applies single-beam operation. The information may be information explicitly indicating whether or not the single beam operation is applied, or may be other setting information tied to whether or not the single beam is used. If it is known that other cells apply single beam operation in the UE, the UE can detect the synchronization signal of the SS block from other cells, since the SS block is the only SS block in the cell, PBCH The index of the SS block in the other cell can be identified from known information (for example, RRC signaling) without reading the SS block index from the cell.

In the above aspect, when the PBCH included in the SS block of the other cell is not decoded, the detection timing of the SS block in the other cell may be specified based on the predetermined timing of the serving cell. For example, if the UE detects the SS block based on the synchronization signal included in the SS block of the other cell (however, the PBCH is not decoded), the detection timing of the SS block of the other cell is a time offset with respect to the predetermined timing of the serving cell. Identify as The UE may signal the time offset to the network as an alternative to SS block timing information (eg, SS block time index) detected in other cells. The network can recognize which SS block the UE has detected from the time offset for the SS block notified from the UE.

In the above aspect, when the UE does not decode the PBCH included in the SS block of the other cell, at least one index for identifying the SS block of the other cell is included in the measurement report using the SS block of the other cell. Do not include the part. The UE may also include an index to identify the SS block of the serving cell in measurement reports using SS blocks only for the serving cell.

In the above aspect, the UE determines whether or not to decode the PBCH included in the SS block of the other cell based on the predetermined information. As a result, when decoding the PBCH included in the SS block of the other cell, An RRM request (Radio Resource Measurement requirement) different from the case of not decoding the PBCH included in the SS block may be applied to the measurement of other cells (including the SS block level measurement).

For example, when decoding a PBCH included in an SS block of another cell, a relaxed RRM requirement can be applied compared to the case of not decoding the PBCH for measurements of other cells. The RRM request can include at least one of a request for measurement delay, a side condition of SINR (Signal to Interference plus Noise Ratio), and the number of cells to be reported. According to this configuration, it is possible to reduce the load on the UE that decodes the PBCH included in the SS blocks of other cells.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings. The wireless communication method according to each embodiment may be applied independently, or may be applied in combination.

In the following embodiments, the "NR-" prefix for signals and channels may be omitted.

(Wireless communication method)
<First Embodiment>
In the first embodiment, the UE determines whether or not to decode the PBCH included in the SS blocks of other cells based on predetermined information. Here, the "predetermined information" used by the UE to determine whether to decode the PBCH included in the SS block of another cell is higher layer signaling (for example, RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling (e.g., MAC control element (MAC CE (Control Element)), broadcast information, etc.), physical layer signaling (e.g., downlink control information (DCI: Downlink Control Information)) or a combination thereof, the UE may be notified (set) to, or may be defined in the specification.

For example, the UE may be explicitly instructed not to decode the PBCH included in the SS block of the other cell using RRC signaling or SIB notified from the network (if it is not instructed to decode the PBCH including). If the UE is instructed not to decode the PBCH included in the SS block of the other cell using RRC signaling or SIB, the SS block based on the synchronization signal (PSS, SSS) included in the SS block of the other cell is detected, the PBCH included in the SS block is not decoded.

Even if the UE does not decode the PBCH included in the SS block of the other cell, if the other cell to be measured is synchronized with the serving cell, the UE can acquire information specifying the SS block of the other cell.

FIG. 2 is a diagram showing an example of specifying SS blocks in the case of a synchronous NW. This example shows the time resources of the SS block when other cells are synchronized with the serving cell. The serving cell and other cells (for example, neighboring cells of the serving cell) #0, #1, and #2 are synchronized, and the beginning of the predetermined SS burst set cycle is the same between the cells.

A serving cell transmits a plurality of SS bursts within an SS burst set period, and one SS burst includes five SS blocks. Other cell #0 has the same SS burst set period as the serving cell, and four SS blocks are included in one SS burst. Other cell #1 has a longer SS burst set period than the serving cell (eg, double), and other cell #2 has a shorter SS burst set period (eg, half) than the serving cell. .

A case where a UE detects an SS block in another cell #0 under the cell synchronization situation shown in FIG. 2 will be described as an example. Assume that the UE detects the synchronization signal of the first SS block (SS#1) among the four SS blocks included in the SS burst in the other cell #0 to detect the first SS block. Decoding the PBCH included in the first SS block (SS#1) reveals the time index of the SS block (SS#1). Specify the timing information (corresponding to the SS block time index).

For example, the UE determines which frame, slot and/or symbol timing in the serving cell the detection timing of the first SS block (SS#1) matches. If it is found that the first SS block (SS #1) in the other cell #0 matches which frame, slot and/or symbol timing in the serving cell, the first SS block (SS #1) is the other cell # 0 to which frame, slot and/or symbol timing.

In this way, the frame, slot and/or symbol timing in other cell #0 is known for the first SS block (SS#1) of other cell #0. Therefore, the UE can know the timing of the detected SS block in the other cell #0 without reading the time index from the PBCH of the first SS block (SS#1) of the other cell #0. frame and slot boundaries can be known.

As shown in FIG. 2, the other cells #1 and #2 are cells with different SS burst set cycles from the serving cell. As with other cell #0, the frame, slot and/or symbol timing in other cells #1 and #2 can be identified for the detected SS block. For example, the UE detects the second SS block (SS#2) by detecting the synchronization signal of the second SS block (SS#2) among the plurality of SS blocks included in the SS burst in the other cell #1. and

The UE identifies to which frame, slot and/or symbol timing in the serving cell the detection timing of the second SS block of interest (SS#2) corresponds. The SS burst set period of other cell #1 is longer than that of the serving cell, but since the UE knows the frame, slot and/or symbol timing of the serving cell, similarly to the above, the timing of the SS block detected in other cell #1 can be identified.

The UE then identifies to which frame, slot and/or symbol timing in the original other cell #1 the frame, slot and/or symbol timing corresponding to the detected SS block in the serving cell corresponds. In this way, it is known which frame, slot and/or symbol timing in the other cell #1 the second SS block (SS#2) that is the object of measurement in the other cell #1 corresponds.

When the UE performs RRM measurements (eg, RSRP measurements) using SS blocks in other cells, in addition to the RRM measurement results, timing information of SS blocks in other cells (timing information based on the serving cell) and / Alternatively, a measurement report including an SS block index (information derived based on the timing of the serving cell) may be transmitted to the network.

The network can identify the SS block from the SS block timing information and/or index information included in the report, determine which beam has better quality in the UE, and appropriately perform beam control (e.g., handover )can.

If the other cell to be measured applies single beam operation (single beam operation), the UE can identify the SS block in the other cell without decoding the PBCH included in the SS block of the other cell. When single-beam operation is applied to another cell, SS blocks having the same SS block index are repeatedly transmitted at the SS burst set period in the other cell. Therefore, if an SS block synchronization signal is detected in another cell, it can be assumed that the detected SS block is an SS block having the same SS block index repeatedly transmitted in the other cell.

UE, in a situation where single beam operation is applied to other cells, if the SS block is detected in other cells, since it is the only SS block in the other cells, without decoding the PBCH, the SS blocks can be identified. For example, treat an SS block with a predetermined SS block index (eg, index #0) as being detected. Alternatively, the SS block index may not be specified for the detected SS blocks.

Note that information on the SS block used in the cell to which single beam operation is applied (eg, SS block index) may be defined in the specification, higher layer signaling (eg, RRC signaling) to the UE by may be notified.

When the UE performs RRM measurements using SS blocks in other cells, in addition to the RRM measurement results, a measurement report including a predetermined SS block index (eg, index #0) may be transmitted to the network. good.

If the UE does not specify the SS block indices of the SS blocks of other cells, the UE may not include the SS block indices in the report. For example, the UE may send a report containing the cell ID and RRM measurements to the network.

The network receives RRM measurement results of SS blocks of other cells from the UE in situations where the other cells to be measured apply single-beam operation. In this case, since the network knows the SS block index used in each cell, it can recognize the SS block and proceed to subsequent processing even for reports that do not contain the SS block index.

<Second embodiment>
In the second embodiment, different RRM requirements are applied when decoding NR-PBCHs included in SS blocks of other cells and when not decoding NR-PBCHs. As RRM requirements (Radio Resource Measurement requirements), for example, at least one of SINR side conditions, measurement time, accuracy, and the number of measurement signals may be defined.

As an additional condition of the SINR, a cell-level SINR lower limit value to be detected may be specified. A maximum delay time with respect to the measurement delay may be specified as the measurement time. As the number of measurement signals, the number of cells of measurement results to be reported to the network, the maximum number of cells, and the like may be specified.

For example, as a result of determining whether the UE decodes the NR-PBCH included in the SS block of another cell based on predetermined information, if the NR-PBCH of the SS block is decoded, the UE is the NR- of the SS block. Apply relaxed RRM requirements compared to not decoding the PBCH.

As an example, assume a case where the UE performs measurement (for example, RRM measurement) on an inactive SCC and reports the measurement result to the network. The network may control the SCC setting state (active state or inactive state) or the like based on the measurement result or the like reported from the UE.

When the UE decodes the NR-PBCH included in the SS blocks of other cells, at least one of the measurement delay requirement, the SINR side condition, and the number of cells to be reported may be relaxed. For example, if the UE decodes the NR-PBCH of the SS blocks of other cells, it may report a smaller number of cell measurements than if it does not decode the NR-PBCH.

According to the second embodiment, when decoding the NR-PBCH of the SS block, the UE can apply a relaxed RRM requirement compared to when not decoding the NR-PBCH of the SS block. It is possible to suppress an increase in the load on the UE when performing communication control based on.

In the above aspect, the UE decodes the PBCH contained in the SS blocks of other cells, reads the time index, and reports the time index to the network. In another aspect, the UE may report the index corresponding to the SS block time index to the network without reading the time index from the PBCH of the SS block.

Specifically, when the UE detects the SS block of the other cell based on the synchronization signal of the SS block of the other cell, the detection timing of the SS block is determined by the serving cell without decoding the PBCH of the SS block. Detects the time offset from the timing of The UE also reports the detected time offset (which may be called a time index) to the network as an index corresponding to the SS block time index.

FIG. 3 is a diagram showing an example of specifying SS blocks in the second embodiment. In this example, the index indicated by the time offset from the predetermined timing of the serving cell is reported as the detection timing of the SS block of the other cell. In FIG. 3, the serving cell and other cell #0 are in an asynchronous state. Note that the serving cell and other cell #0 may be synchronized.

In the serving cell, a plurality of SS burst sets are arranged in an SS burst set period, and five SS blocks are transmitted in one SS burst set. On the other hand, the other cell #0 is asynchronous with respect to the serving cell, and the number of SS blocks forming one SS burst set is different from that of the serving cell. A time index (#0, . . . , #n, .

In the example shown in FIG. 3, the time index is determined based on the start timing of the SS burst set period in the serving cell. Specifically, in other cell #0, the head SS block of a given SS burst set period corresponds to time index #n. Note that the SS blocks in the second half of the SS burst set cycle in other cell #0 correspond to the first half of the SS burst set cycle in the serving cell. Therefore, the time index also switches to a lower number when the beginning of the SS burst set period in the serving cell is reached.

The UE receives the SS block in the SS burst set period in other cell #0 and detects the SS block based on the synchronization signal included in the SS block. For example, the UE measures RSRP in SS block units and reports the RSRP measurement results in SS block units to the network.

When reporting the RSRP measurements of the detected SS blocks to the network, the time index relative to the given timing of the serving cell is used instead of reading the time index from the PBCH of the SS block. For example, when the first SS block of the SS burst set cycle is detected in another cell #0, the time index #n is reported based on the serving cell.

In this way, when each SS block is detected in other cell #0, the time index is reported with reference to the serving cell. Therefore, the network can detect the SS block time index detected from the PBCH and the SS block time index detected from the PBCH without increasing the load on the UE. receive equivalent information.

Note that if multiple SS blocks are detected in other cells, the time indexes for these multiple SS blocks may be reported to the network respectively. In this case, it is preferable that the measurement results of the detected SS blocks are individually reported without being averaged.

<Third Embodiment>
The third embodiment is an example in which the time index is not always read from the PBCH for the SS blocks of other cells regardless of predetermined information. The third embodiment does not require SS block indices to identify individual SS blocks for reports of cell measurements in other cells.

When the UE does not decode the PBCH included in the SS block of the other cell, the measurement report using the SS block of the other cell controls not to include at least part of the index for specifying the SS block of the other cell. conduct. For the serving cell, the UE may also include the SS block index to identify the SS block of the serving cell in the measurement report using the SS block.

For example, the UE assumes that the serving cell requires RSRP measurement results and SS block indices in units of SS blocks, while the RSRP measurement results and SS block indices in units of SS blocks are not required for other cells. good too.

In the UE, when multiple SS blocks of other cells are detected, if the SS blocks have the same cell ID, the cell-level RSRP for that cell ID may be reported. Alternatively, when multiple SS blocks of other cells are detected in the UE, if the SS blocks have the same cell ID, the UE may report the top N SS block level RSRPs among the RSRPs in units of SS blocks.

Combining these two aspects, the UE reports one cell-level RSRP for one cell ID with the cell ID, and the top N SS block-level RSRPs of the SS block-wise RSRPs without the SS block index. You can report.

The third embodiment does not require the SS block index, which can be read from the PBCH of the SS block, but may report information obtained in the process prior to decoding the PBCH of the SS block. For example, when the SS block index is implicitly expressed, it is assumed that some information for identifying the SS block is obtained in the process prior to decoding the PBCH of the SS block.

Also, to identify the SS block by the sequence of the signal (PSS/SSS/PBCH) and/or the predetermined signal (for example, predetermined reference signal) included in the SS block, the time and/or frequency resource, the scramble ID, etc. may be obtained.

For example, if the SS burst index is implicitly used to indicate the time index of the SS block, and if the SS burst index can be obtained without decoding the PBCH, the SS burst index can be passed to the network along with the SS block level RSRP. You can report to

According to the third embodiment described above, for example, the UE assigns the SS block index to the SS block level measurement result for the serving cell and reports it, but does not report the SS block level measurement result for other cells. Or, the upper N SS block-level RSRPs can be reported for one cell ID, thus reducing the burden of decoding other cell's PBCH on the UE.

(wireless communication system)
A configuration of a wireless communication system according to an embodiment of the present invention 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 invention or a combination thereof.

FIG. 4 is a diagram showing an example of a schematic configuration of a radio communication system according to one embodiment of the present invention. 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 radio communication system 1 includes a radio base station 11 forming a macro cell C1 with a relatively wide coverage, and a radio base station 12 (12a-12c) arranged in the macro cell C1 and forming a small cell C2 narrower than the macro cell C1. , is equipped with 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 radio base station 11 and the radio 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 multiple cells (CCs) (eg, 5 or less CCs, 6 or more CCs).

Communication between the user terminal 20 and the radio base station 11 can be performed using a carrier with a relatively low frequency band (eg, 2 GHz) and a narrow bandwidth (also called an existing carrier, legacy carrier, etc.). On the other hand, between the user terminal 20 and the radio 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 as during Note that the configuration of the frequency band used by each radio 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.

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

The radio base station 11 and each radio base station 12 are each connected to a higher station apparatus 30 and connected to a core network 40 via the higher station apparatus 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 radio base station 12 may be connected to the higher station apparatus 30 via the radio base station 11 .

Note that the radio base station 11 is a radio 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 radio base station 12 is a radio 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 Also called a point. Hereinafter, the radio base stations 11 and 12 are collectively referred to as the radio 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.

Scheduling information may be notified by DCI. For example, a DCI that schedules DL data reception may be referred to as a DL assignment, and a DCI that schedules UL data transmission may be referred to as 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.

(radio base station)
FIG. 5 is a diagram showing an example of the overall configuration of a radio base station according to one embodiment of the present invention. The radio 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 line 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 radio 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 .

The transmitting/receiving unit 103 converts the baseband signal output from the baseband signal processing unit 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 section 103 can be composed of a transmitter/receiver, a transmitting/receiving circuit, or a transmitting/receiving device described based on common recognition in the technical field of the present invention. 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 radio 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 radio base stations 10 via an interface between base stations (for example, an optical fiber conforming to CPRI (Common Public Radio Interface), an X2 interface). may

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.

The transmitting/receiving section 103 may transmit a signal using a transmission beam and may receive a signal using a reception beam. Transceiver 103 may transmit and/or receive signals using a predetermined beam determined by controller 301 .

Transceiver 103 transmits one or more synchronization signal blocks (SS blocks) including synchronization signals (eg, NR-PSS, NR-SSS, etc.) and broadcast channels (eg, NR-PBCH). Transceiver 103 may transmit NR-PBCH having the same content and/or structure using different SS blocks.

The transmitting/receiving unit 103 provides an instruction as to whether to decode the PBCH included in the SS block of the other cell, information regarding whether the other cell to be measured is synchronized with the serving cell, and the other cell to be measured for single beam operation. may be transmitted to the user terminal 20.

The transmitting/receiving unit 103 may receive a cell level and/or SS block level measurement report from the user terminal 20 .

FIG. 6 is a diagram showing an example of the functional configuration of a radio base station according to one embodiment of the present invention. Note that this example mainly shows the functional blocks that characterize the present embodiment, and it may be assumed that the wireless 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 the radio base station 10, and some or all of the configurations need not be included in the baseband signal processing section 104. FIG.

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

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. Further, 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.

In addition, the control unit 301 includes an uplink data signal (for example, a signal transmitted by PUSCH), an uplink control signal (for example, a signal transmitted by PUCCH and/or PUSCH, such as acknowledgment information), a random access preamble (for example, It controls the scheduling of the PRACH signal), uplink reference signal, and the like.

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 .

The control unit 301 may use RRC signaling or SIB to explicitly instruct the user terminal 20 not to decode the PBCH included in the SS blocks of other cells.

In addition, the control unit 301 sets SS blocks so that a predetermined SS burst set (see FIG. 1) is realized for each of the serving cell and other cells. Synchronization signals and PBCH are scheduled in each SS block. For example, as shown in FIG. 2, the transmission/reception timing of each cell may be controlled so that the serving cell and other cells #0, #1, and #2 are synchronized.

Also, the control unit 301 may receive reports of measurement results (for example, cell level measurement results, SS block level measurement results) in the serving cell and other cells from the user terminal 20 .

For example, in a situation where the other cell to be measured is synchronized with the serving cell, the control unit 301 uses the RSRP measurement result in the other cell to be measured and the timing information of the SS block in the other cell (timing based on the serving cell information) may be received. In this case, the timing information of the SS block identifies the SS block for the reported RSRP measurements. The control unit 301 may determine which beam has better quality in the user terminal 20 based on the received measurement result, and perform control such as changing the beam.

Also, the control unit 301 may receive the RSRP measurement result of the SS block in the other cell from the user terminal 20 in a situation where the other cell to be measured applies single beam operation. In this case, the control unit 301 can identify the SS block even if the report does not have the SS block index, because it knows that the other cell has a single beam.

Also, the control section 301 may assume different RRM requests for measurements in other cells depending on whether the user terminal 20 decodes the PBCH included in the SS block of the other cell or does not decode the PBCH. For example, when the PBCH included in the SS block of another cell is decoded in the user terminal 20, the control unit 301 relaxes at least one of the SINR side condition, the measurement time, the accuracy, and the number of measurement signals. It can be assumed that

In addition, when the user terminal 20 detects each SS block in another cell and reports the time index based on the serving cell, the control unit 301 detects the user terminal 20 in the other cell based on the time index. SS blocks may be identified.

In addition, when the user terminal 20 reports information obtained in the process before decoding the PBCH of the SS block, the control section 301 identifies the SS block detected in the other cell by the user terminal 20 from the information. good too.

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, which will be described based on common recognition in the technical field of the present invention.

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 corresponding 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 composed of a mapper, a mapping circuit, or a mapping device described based on common understanding in the technical field related to the present invention.

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 composed of a signal processor, a signal processing circuit, or a signal processing device described based on common recognition in the technical field of the present invention.

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 measuring unit 305 can be configured from a measuring instrument, a measuring circuit, or a measuring device described based on common recognition in the technical field of the present invention.

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. 7 is a diagram showing an example of the overall configuration of a user terminal according to one embodiment of the present invention. 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 section 203 can be composed of a transmitter/receiver, a transmitting/receiving circuit, or a transmitting/receiving device described based on common recognition in the technical field of the present invention. 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.

The transmitting/receiving section 203 may transmit a signal using a transmission beam and may receive a signal using a reception beam. Transceiver 203 may transmit and/or receive signals using a predetermined beam determined by controller 401 .

The transceiver 203 receives one or more synchronization signal blocks (SS blocks) including synchronization signals (eg, NR-PSS, NR-SSS, etc.) and broadcast channels (eg, NR-PBCH).

The transmitting/receiving unit 203 provides an instruction as to whether to decode the PBCH included in the SS block of the other cell, information regarding whether the other cell to be measured is synchronized with the serving cell, and the other cell to be measured for single beam operation. may be received from the radio base station 10, such as information on whether or not the

The transmitting/receiving section 203 may transmit a cell level and/or SS block level measurement report to the radio base station 10 .

FIG. 8 is a diagram showing an example of the functional configuration of a user terminal according to one embodiment of the present invention. 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, which will be explained based on common recognition in the technical field of the present invention.

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 radio base station 10 from the received 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 .

The control unit 401 receives one or more SS blocks including a synchronization signal and a broadcast channel (PBCH) from the serving cell and other cells, and based on predetermined information, either decodes the PBCH included in the SS blocks of the other cells. determine whether or not

The predetermined information may be an instruction as to whether or not to decode the PBCH included in the SS blocks of other cells. The control unit 401 can use information regarding whether or not the other cell to be measured is synchronized with the serving cell as the predetermined information. In addition, the control unit 401 can use, as the predetermined information, information regarding whether or not the other cell to be measured applies single beam operation.

Also, when the PBCH included in the SS block of the other cell is not decoded, the control section 401 may specify the detection timing of the SS block in the other cell based on the predetermined timing of the serving cell.

In addition, when the PBCH included in the SS block of the other cell is not decoded, the control unit 401 adds at least part of the index for specifying the SS block of the other cell to the measurement report using the SS block of the other cell. You may perform control which does not include . Control section 401 includes an index for specifying the SS block of the serving cell in the measurement report using the SS block for the serving cell, and specifies the SS block of the other cell in the measurement report using the SS block for the other cell. You may perform control not to include the index of .

Further, based on predetermined information, control section 401 determines whether or not to decode the PBCH included in the SS block of another cell. For cell measurements (including SS block level measurements), different RRM requirements may apply than when not decoding the PBCH contained in the SS block. For example, when decoding a PBCH included in an SS block of another cell, a relaxed RRM requirement is applied compared to the case of not decoding the PBCH with respect to measurements of other cells.

Further, when various information notified from the radio 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, which will be described based on common recognition in the technical field of the present invention.

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, the transmission signal generator 402 is instructed by the controller 401 to generate an uplink data signal when the downlink control signal notified from the radio base station 10 includes the UL grant.

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 composed of a mapper, a mapping circuit, or a mapping device described based on common understanding in the technical field related to the present invention.

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 radio base station 10 . The received signal processing unit 404 can be composed of a signal processor, a signal processing circuit, or a signal processing device, which are explained based on the common recognition in the technical field related to the present invention. Also, the received signal processing section 404 can constitute a receiving section according to the present invention.

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. The measuring unit 405 can be configured from a measuring instrument, a measuring circuit, or a measuring device described based on common recognition in the technical field of the present invention.

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 .

(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 hardware and/or software. Also, the method of realizing each functional block is not particularly limited. That is, each functional block may be implemented using one device physically and/or logically coupled, or may be implemented using two or more physically and/or logically separate devices directly and/or or indirectly connected (eg, using wired and/or wireless) and implemented using these multiple devices.

For example, a radio base station, a user terminal, etc. in one embodiment of the present invention may function as a computer that performs processing of the radio communication method of the present invention. FIG. 9 is a diagram showing an example of hardware configurations of a radio base station and a user terminal according to one embodiment of the present invention. The radio base station 10 and the user terminal 20 described above may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like. good.

Note that in the following description, the term "apparatus" can be read as a circuit, device, unit, or the like. The hardware configuration of the radio 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 one or more processors concurrently, serially, or otherwise. Note that processor 1001 may be implemented by one or more chips.

Each function in the radio base station 10 and the user terminal 20 is performed by the processor 1001 by loading predetermined software (program) onto hardware such as the processor 1001 and the memory 1002, and the processing is performed via the communication device 1004. It is realized by controlling communication and controlling reading and/or writing of data in the memory 1002 and 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 the storage 1003 and/or the communication device 1004 to the memory 1002, and executes various processes according to them. 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 invention.

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 a wired and/or wireless network, and is also called a network device, network controller, network card, communication module, or the like. Communication device 1004 includes high frequency switches, duplexers, filters, frequency synthesizers, etc., for example, to implement Frequency Division Duplex (FDD) and/or Time Division Duplex (TDD). may be configured. 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 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 radio base station 10 and the user terminal 20 are microprocessors, digital signal processors (DSPs), ASICs (Application Specific Integrated Circuits), PLDs (Programmable Logic Devices), FPGAs (Field Programmable Gate Arrays), etc. It may be configured including 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 specification and/or terms necessary for understanding this specification may be replaced with terms having the same or similar meanings. For example, channels and/or symbols may be signals. 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) may also be called a cell, a frequency carrier, a carrier frequency, or the like.

A radio frame may also 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 of a fixed length of time (eg, 1 ms) independent of neumerology.

Furthermore, 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 also include multiple mini-slots. Each minislot may consist of one or more symbols in the time domain. A minislot may also be referred to as a subslot.

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. 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, the subframe and / or TTI may be a subframe (1 ms) in existing LTE, may be a period shorter than 1 ms (eg, 1-13 symbols), or a period longer than 1 ms There 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 radio 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 unit of transmission time for channel-encoded data packets (transport blocks), code blocks, and/or codewords, or may be a unit of processing such as scheduling and link adaptation. Note that when a TTI is given, the actual time interval (eg number of symbols) to which the transport blocks, code blocks and/or codewords are 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 time length of 1 ms may be called a normal TTI (TTI in LTE Rel. 8-12), normal TTI, long TTI, normal subframe, normal subframe, long subframe, or the like. A TTI that is shorter than a normal TTI may also be called a shortened TTI, a short TTI, a partial or fractional TTI, a shortened subframe, a short subframe, a minislot, or a subslot.

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. 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 and one subframe may each consist of one or a plurality of 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.

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 herein 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 as For example, radio resources may be indicated by a predetermined index.

The names used for parameters and the like in this specification are not limiting names in any way. For example, various channels (PUCCH (Physical Uplink Control Channel), PDCCH (Physical Downlink Control Channel), etc.) and information elements can be identified by any suitable name, so that various Names are not exclusive names in any way.

Information, signals, etc. described herein 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 herein 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. The RRC signaling may also be called an RRC message, such as an RRC connection setup (RRCConnectionSetup) message, an RRC connection reconfiguration (RRCConnectionReconfiguration) 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, servers, etc. , or other remote source, these wired and/or wireless technologies are included within the definition of transmission media.

As used herein, the terms "system" and "network" are used interchangeably.

As used herein, "base station (BS)", "radio base station", "eNB", "gNB", "cell", "sector", "cell group", "carrier" and "component The term "carrier" may be used interchangeably. A base station may also be called a fixed station, a NodeB, an eNodeB (eNB), an access point, a transmission point, a reception point, a femtocell, a small cell, and other terms.

A base station may serve one or more (eg, three) cells (also called sectors). 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: The term "cell" or "sector" may refer to part or all of the coverage area of a base station and/or base station subsystem serving communication services in such coverage. Point.

As used herein, the terms “Mobile Station (MS),” “user terminal,” “User Equipment (UE),” and “terminal” may be used interchangeably. . A base station may also be called a fixed station, a NodeB, an eNodeB (eNB), an access point, a transmission point, a reception point, a femtocell, a small cell, and other terms.

A mobile station is defined by those skilled in the art as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless It may also be called a terminal, remote terminal, handset, user agent, mobile client, client or some other suitable term.

Also, the radio base station in this specification may be read as a user terminal. For example, each aspect/embodiment of the present invention may be applied to a configuration in which communication between a radio base station and a user terminal is replaced with communication between a plurality of user terminals (D2D: Device-to-Device). In this case, the user terminal 20 may have the functions of the radio base station 10 described above. Also, words such as "up" and "down" may be read as "side". For example, an uplink channel may be read as a side channel.

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

In this specification, operations performed by a base station may be performed by an upper node of the base station. 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 herein may be used alone, may be used in combination, or may be switched between implementations. Also, the processing procedures, sequences, flowcharts, etc. of each aspect/embodiment described herein may be rearranged as long as there is no contradiction. For example, the methods described herein present elements of the various steps in a sample order, and are not limited to the specific order presented.

Each aspect/embodiment described herein supports Long Term Evolution (LTE), 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) (Global System for Mobile Communications), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (Registered Trademark)), IEEE 802.16 (WiMAX (Registered Trademark)), IEEE 802 .20, Ultra-WideBand (UWB), Bluetooth, or other suitable wireless communication methods, and/or extended next-generation systems based on these.

As used herein, 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 herein does not generally limit the quantity or order of those elements. These designations may be used herein 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 herein may encompass a wide variety of actions. For example, "determining" means calculating, computing, processing, deriving, investigating, looking up (e.g., in a table, database or other data searching in the 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.

The terms "connected", "coupled", or any variation thereof, as used herein, refer to any connection or connection, direct or indirect, between two or more elements. A connection is meant 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".

As used herein, when two elements are connected, using one or more wires, cables and/or printed electrical connections, and as some non-limiting and non-exhaustive examples, the radio frequency domain , electromagnetic energy having wavelengths in the microwave range and/or the optical (both visible and invisible) range, and the like.

As used herein, the term "A and B are different" may mean "A and B are different from each other." Terms such as "separate," "coupled," etc. may be interpreted similarly.

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

Although the present invention has been described in detail above, it should be apparent to those skilled in the art that the present invention is not limited to the embodiments described herein. The present invention can be implemented as modifications and changes without departing from the spirit and scope of the present invention determined based on the description of the claims. Accordingly, the description herein is for illustrative purposes and does not impose any limitation on the present invention.

Claims (8)

a receiver for receiving a synchronization signal block containing a synchronization signal and a broadcast channel;
As information on whether the neighboring cell is synchronized with the serving cell, when information indicating that the neighboring cell is synchronized with the serving cell is notified from the base station, based on the timing of the serving cell, the neighboring cell a controller for deriving a synchronization signal block index for a synchronization signal block transmitted by a terminal. When the control unit is notified of information indicating that the adjacent cell is synchronized with the serving cell as information on whether the adjacent cell is synchronized with the serving cell, the synchronization signal block of the adjacent cell 2. The terminal of claim 1, which does not decode a broadcast channel included in the . The control unit, when not decoding the broadcast channel included in the synchronization signal block of the adjacent cell, is different from the case of decoding the broadcast channel included in the synchronization signal block of the adjacent cell RRM request (Radio Resource Measurement requirement) 3. A terminal according to claim 2, wherein The control unit, when decoding the broadcast channel included in the synchronization signal block of the neighboring cell, applies a relaxed RRM request compared to when not decoding the broadcast channel included in the synchronization signal block of the neighboring cell. A terminal according to claim 3. 5. A terminal according to claim 3 or 4, wherein said RRM request is a request for measurements. receiving a synchronization signal block comprising a synchronization signal and a broadcast channel;
As information on whether the neighboring cell is synchronized with the serving cell, when information indicating that the neighboring cell is synchronized with the serving cell is notified from the base station, based on the timing of the serving cell, the neighboring cell deriving a synchronization signal block index for a synchronization signal block transmitted by a terminal. a transmitter for transmitting a synchronization signal block including a synchronization signal and a broadcast channel to a terminal;
Information on whether the neighboring cell is synchronized with the serving cell is used to allow the terminal to derive a synchronization signal block index of a synchronization signal block transmitted by the neighboring cell based on the timing of the serving cell. and a control unit that performs control for notifying the terminal of information indicating that it is synchronized with the serving cell. A system including a terminal and a base station,
The terminal is
a receiver for receiving a synchronization signal block containing a synchronization signal and a broadcast channel;
As information on whether or not the neighboring cell is synchronized with the serving cell, when information indicating that the neighboring cell is synchronized with the serving cell is notified from the base station, based on the timing of the serving cell, the neighboring cell a controller for deriving a synchronization signal block index for a synchronization signal block transmitted by the cell;
The base station
A system comprising a transmitting unit configured to transmit information indicating that the adjacent cell is synchronized with the serving cell to the terminal as information regarding whether the adjacent cell is synchronized with the serving cell.

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