Terminal, wireless communication method of terminal, base station and system

Abstract

A terminal involved in one embodiment of the present invention comprises: a receiving unit, which receives a synchronization signal block including a synchronization signal and a broadcast channel from a base station; and a control unit, which, when information indicating that the adjacent cell is synchronized with the service cell is notified to the terminal from the base station as information regarding whether the adjacent cell is synchronized with the service cell, derives a synchronization signal block index of the synchronization signal block sent by the adjacent cell based on the timing of the service cell.

Description

[0001] The present invention is a divisional application. The application date of the original application is May 2, 2017. The original application number is 201780090340.X. The name of the original invention is User Terminal and Wireless Communication Method. Technical Field

[0002] The present invention relates to a terminal, a wireless communication method of the terminal, a base station and a system in a next generation mobile communication system. Background Art

[0003] In the UMTS (Universal Mobile Telecommunications System) network, Long Term Evolution (LTE) is standardized for the purpose of further high-speed data rate, low latency, etc. (Non-Patent Document 1). In addition, LTE-A (LTE-Advanced, LTE Rel. 10, 11, 12, 13) is standardized for the purpose of further increasing the capacity and sophistication of LTE (LTE Rel. 8, 9).

[0004] Subsequent systems of LTE (for example, also known as 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 Rel.14 or 15 and later, etc.) are also studied.

[0005] In the existing LTE system (for example, LTE Rel.8-13), the user terminal (user equipment (UE: User Equipment)) detects the synchronization signal (PSS (Primary Synchronization Signal) and SSS (Secondary Synchronization Signal)) through cell search, synchronizes with the network (for example, the base station (eNB (eNode B))), and identifies the connected cell (for example, through the cell ID (Identifier)).

[0006] In addition, after searching the cell, the UE receives the master information block (MIB: Master Information Block) sent through the broadcast channel (Physical Broadcast Channel (PBCH: Physical Broadcast Channel)), the system information block (SIB: System Information Block) sent through the shared data channel (Physical Downlink Shared Channel (PDSCH: Physical Downlink Shared Channel)), etc., and obtains the setting information (also called broadcast information, system information, etc.) used for communication with the network.

[0007] Prior art literature

[0008] Non-patent literature

[0009] Non-patent document 1: 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 Summary of the invention

[0010] Problems to be solved by the invention

[0011] In future wireless communication systems (eg, NR), it is studied to define a resource unit including a synchronization signal and a broadcast channel as an SS block (Synchronization Signal block) and to perform an initial connection based on the SS block.

[0012] In addition, studies have been conducted to measure SS blocks in cells other than the serving cell. In this case, it is preferred to determine which SS block of the other cell is measured and report it. However, there is a problem that the UE burden increases when determining the SS block of the other cell.

[0013] Therefore, one of the objects of the present invention is to provide a user terminal and a wireless communication method that can suppress an increase in the processing burden of a UE even when communication control based on SS blocks is performed.

[0014] Means for solving problems

[0015] A terminal involved in one embodiment of the present invention comprises: a receiving unit, which receives a synchronization signal block including a synchronization signal and a broadcast channel from a base station; and a control unit, which, when information indicating that the adjacent cell is synchronized with the service cell is notified to the terminal from the base station as information regarding whether the adjacent cell is synchronized with the service cell, derives a synchronization signal block index of the synchronization signal block sent by the adjacent cell based on the timing of the service cell.

[0016] Effects of the Invention

[0017] According to the present invention, even when communication control is performed based on SS blocks, it is possible to suppress an increase in the processing burden of UE. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a conceptual diagram of the SS block.

[0019] Figure 2 This is a diagram showing an example of determining the SS block in the case of synchronization with NW.

[0020] Figure 3 This is a diagram showing an example of determining the SS block in the second embodiment.

[0021] Figure 4 This is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment of the present invention.

[0022] Figure 5 This is a diagram showing an example of the overall configuration of a wireless base station according to an embodiment of the present invention.

[0023] Figure 6 This is a diagram showing an example of a functional configuration of a wireless base station according to an embodiment of the present invention.

[0024] Figure 7 This is a diagram showing an example of the overall configuration of a user terminal according to an embodiment of the present invention.

[0025] Figure 8 This is a diagram showing an example of a functional configuration of a user terminal according to an embodiment of the present invention.

[0026] Fig. 9 This is a diagram showing an example of the hardware configuration of a wireless base station and a user terminal according to an embodiment of the present invention. DETAILED DESCRIPTION

[0027] In future wireless communication systems (for example, LTE Rel.14, 15 and later, 5G, NR, etc., hereinafter also referred to as NR), research is being conducted to define resource units containing synchronization signals and broadcast channels as SS blocks (Synchronization Signal blocks) and to perform initial connection based on the SS blocks.

[0028] For SS blocks, refer to Figure 1 Provide explanation. Figure 1 This is a conceptual diagram of the SS block. Figure 1 The SS block shown includes at least PSS for NR (NR-PSS), SSS for NR (NR-SSS) and PBCH for NR (NR-PBCH), which can be used for the same purposes as PSS, SSS and PBCH of the existing LTE system. In addition, a synchronization signal (TSS: Tertiary SS) different from PSS and SSS can also be included in the SS block.

[0029] A collection of one or more SS blocks may also be referred to as an SS burst. In this example, an SS burst is composed of multiple SS blocks that are continuous in time, but is not limited thereto. For example, an SS burst may also be composed of SS blocks whose frequency and / or time resources are continuous, or may be composed of SS blocks whose frequency and / or time resources are non-continuous.

[0030] The SS burst is preferably transmitted at a predetermined period (also referred to as an SS burst period). Alternatively, the SS burst may not be transmitted at each period (sent in an aperiodic manner). The SS burst length and / or the SS burst period may also be transmitted during one or more subframes, one or more time slots, etc.

[0031] In addition, one or more SS bursts may also be referred to as an SS burst set (SS burst series). For example, a base station (also referred to as a BS (Base Station), a transmission / reception point (TRP: Transmission / Reception Point), an eNB (eNode B), a gNB, etc.) and / or a UE may also use one or more SS bursts included in an SS burst set to perform beam sweeping on multiple SS blocks and transmit.

[0032] In addition, the SS burst set is preferably transmitted periodically. The UE may also control the reception process assuming that the SS burst set is transmitted periodically (at the SS burst set period).

[0033] 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).

[0034] In NR, the following initial access process using SS blocks is studied. First, the UE detects the NR-PSS (step S101). Based on step S101, the UE roughly synchronizes the time and frequency, and identifies the scrambling ID (also called local ID) of the NR-SSS sent by the NR cell (cell supporting NR).

[0035] Next, the UE detects the NR-SSS (step S102). The relative resource locations of the NR-PSS and NR-SSS are determined by the specification. After step S102 is completed, the UE can determine the cell ID.

[0036] The UE detects the NR-PBCH and decodes it (step S103). The relative resource position of the NR-PBCH relative to the NR-SSS (or NR-PSS) is determined by the specification. In addition, the UE can perform channel estimation for decoding the NR-PBCH based on a specified reference signal (e.g., a demodulation reference signal (DMRS: DeModulation Reference Signal)).

[0037] The NR-SSS and NR-PBCH detected in steps S102 and S103 correspond to the same SS block index as the NR-PSS, respectively.

[0038] The UE detects and decodes the downlink control channel (e.g., the control channel for NR (NR-PDCCH (Physical Downlink Control Channel))) required to receive the minimum system information (e.g., which may also be called RMSI (Remaining Minimum System Information)) (step S104). Based on the NR-PDCCH, the UE determines the structural information of the NR-PDSCH that transmits the RMSI.

[0039] The UE can monitor the specified control resource set to detect the NR-PDCCH. In addition, the control resource set is a resource set that becomes a transmission candidate for the downlink control channel (NR-PDCCH), and may also be referred to as a control resource set (CORSET: COntrol Resource SET), a control subband, a search space for a control channel, a search space set, a search space resource set, a control region, a control subband, an NR-PDCCH region, etc. In the case of this specification, it is assumed that the control resource set is mainly a control resource set required for receiving RMSI, but is not limited to this.

[0040] The UE decodes the NR-PDSCH based on the NR-PDSCH configuration information determined in step S104, and acquires the RMSI (step S105). The UE determines at least the random access channel configuration (RACH (Random Access Channel) configuration) based on the RMSI.

[0041] The UE performs a random access procedure based on the RACH setting (step S106).

[0042] In addition, NR is studying the operation of a system using a single beam or multiple beams. For example, in the case of multi-beam operation, it is considered to perform beam scanning on multiple SS blocks and periodically and repeatedly send the entire SS burst set. In addition, NR-PSS, NR-SSS, and NR-PBCH corresponding to the same SS block index can also be sent through the same beam.

[0043] However, in NR, it is studied that the UE not only performs cell-level measurements but also performs SS block-level measurements. For example, SS block-level measurements are assumed to measure the RSRP of the SS block and the RSRP of the CSI-RS in the connected mode. It is studied that the RSRP of the SS block (SS block RSRP) is measured based on NR-SSS (and DMRS for PBCH demodulation). In the case of CSI-RS measurement, it is necessary to confirm the existence of the cell and ensure the timing, and it is studied to obtain the timing information of the cell from the SS block.

[0044] The timing information of the SS block may also be referred to as the time index of the SS block, etc. The time index of the SS block may also be represented by, for example, an SS burst set index, an SS burst index (within an SS burst set), an SS block index, a symbol index, a time slot index, a system frame number, etc., or a combination thereof.

[0045] In addition, for example, the SS block index may use the same index between SS bursts in an SS burst set, or may use different indexes for each SS block in the SS burst set.

[0046] In addition, in NR, it is studied to measure not only the serving cell but also other cells other than the serving cell (for example, neighboring cells). As mentioned above, RSRP measurement at the SS block level is also required in other cells.

[0047] However, when the RSRP measurement results of the SS block are reported from the UE to the network, it is considered to include information that can identify the SS block (e.g., the SS block index) in the report. By determining the SS block corresponding to the report, the network can, for example, determine which beam has good quality from the UE's perspective and can smoothly control the switching of the beam.

[0048] In addition, by bundling the SS block index and the information that determines the CSI-RS (e.g., CSI-RS ID), effective utilization can be achieved. For example, the network allocates CSI-RS to all cells. The network specifies (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 structure, the UE only needs to perform the specified CSI-RS measurement, thereby reducing the burden.

[0049] In this way, it can be seen that the SS block index transmitted using NR-PBCH is useful information for the network and UE.

[0050] However, when the UE obtains the SS block index from the NR-PBCH included in the SS block of other cells, it is necessary to decode the NR-PBCH from each SS block of all other cells, which causes processing delay and increased burden in the UE.

[0051] Therefore, the present inventors studied a method that can suppress a decrease in communication throughput even when performing communication control based on SS blocks, and arrived at the present invention.

[0052] A user terminal of one embodiment of the present invention receives at least one synchronization signal block (called SS block) including a synchronization signal and a broadcast channel (called PBCH) from at least a serving cell, and determines whether to decode the PBCH included in the SS block of other cells based on specified information.

[0053] According to one embodiment of the present invention, whether to decode the PBCH included in the SS block of another cell is determined based on the specified information, thereby generating a situation where the PBCH of the SS block does not need to be decoded. In this way, the decoding of the PBCH can be excluded based on the specified information, and when performing communication control based on the SS block, the increase in the processing burden of the UE can also be suppressed.

[0054] In the above method, the specified information may also be an indication of whether to decode the PBCH contained in the SS block of other cells. For example, the network notifies the UE whether it is possible to not read the SS blocks of other cells. Alternatively, the conditions under which the UE may not read the SS blocks of other cells may be determined in advance by the specification. The notification indicating whether it is possible to not read the SS blocks of other cells and the conditions under which the SS blocks of other cells may not be read determined by the specification can be used as an indication of whether to decode the PBCH.

[0055] In the above-mentioned manner, the UE can use information about whether other cells of the measurement object are synchronized with the serving cell as the prescribed information. The information may also be information that explicitly shows whether the surrounding cells of the measurement object frequency are synchronized with the serving cell, or other setting information related to whether they are synchronized. If it is known in the UE that other cells are synchronized with the serving cell, as long as the synchronization signal of the SS block of the other cell can be detected, even if the timing information (e.g., time index) of the SS block is read without demodulating the PBCH, the frame and time slot boundaries of the other cells can be known.

[0056] In the above-mentioned manner, the UE can use information related to whether other cells of the measurement object apply single-beam operation as the prescribed information. The information may also be information that explicitly indicates whether single-beam operation is applied, or other setting information associated with whether it is a single beam. In the case where the UE knows that other cells apply single-beam operation, as long as 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, even if the SS block index is not read from the PBCH, the index of the SS block in the other cell can be determined based on known information (e.g., RRC signaling).

[0057] In the above-mentioned manner, without decoding the PBCH contained in the SS blocks of other cells, the detection timing of the SS blocks in other cells can be determined based on the prescribed timing of the serving cell. For example, if the UE detects the SS block based on the synchronization signal contained in the SS block of other cells (wherein the PBCH is not decoded), the detection timing of the SS block of other cells is determined as a time offset relative to the prescribed timing of the serving cell. The UE may also notify the network of the time offset as information replacing the timing information (e.g., SS block time index) of the SS blocks detected in other cells. The network can identify which SS block the UE has detected based on the time offset relative to the SS block notified from the UE.

[0058] In the above-mentioned method, when the UE does not decode the PBCH included in the SS block of the other cell, the UE performs the following control: in the measurement report using the SS block of the other cell, at least a part of the index for identifying the SS block of the other cell is not included. The UE can also include the index for identifying the SS block of the serving cell in the measurement report using the SS block only with respect to the serving cell.

[0059] In the above method, when the UE determines whether to decode the PBCH included in the SS block of other cells based on the specified information, and the result is that the PBCH included in the SS block of other cells is decoded, it can also apply RRM requirements (Radio Resource Measurement requirement) different from the case where the PBCH included in the SS block is not decoded to the measurement of other cells (including SS block level measurement).

[0060] For example, when decoding the PBCH included in the SS block of other cells, the RRM requirements relaxed compared to the case where the PBCH is not decoded can be applied to the measurement of other cells. The RRM requirements can include at least one of the requirements for measurement delay, the side condition of SINR (Signal to Interference plus Noise Ratio), and the number of cells to be reported. According to this structure, the load of the UE that decodes the PBCH included in the SS block of other cells can be reduced.

[0061] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The wireless communication methods according to the embodiments may be applied individually or in combination.

[0062] In addition, in the following embodiments, the prefix "NR-" related to the signal and the channel may be omitted and marked.

[0063] (Wireless Communication Method)

[0064] <First embodiment>

[0065] In one embodiment, the UE determines whether to decode the PBCH included in the SS block of other cells based on specified information. Here, the "specified information" used by the UE to determine whether to decode the PBCH included in the SS block of other cells can also be notified (set) to the UE using high-layer signaling (e.g., RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling (e.g., MAC control element (MAC CE (ControlElement)), broadcast information, etc.), physical layer signaling (e.g., downlink control information (Downlink Control Information (DCI)))) or a combination thereof, and can also be specified by specifications.

[0066] For example, the UE may be explicitly notified not to decode the PBCH included in the SS block of other cells (including the case where the PBCH is not instructed to decode) using RRC signaling or SIB notified from the network. When the UE is instructed not to decode the PBCH included in the SS block of other cells using RRC signaling or SIB, the UE detects the SS block based on the synchronization signal (PSS, SSS) included in the SS block of other cells, and on the other hand, does not decode the PBCH included in the SS block.

[0067] Even when the UE does not decode the PBCH included in the SS block of the other cell, when the other cell to be measured is synchronized with the serving cell, the UE can obtain information identifying the SS block of the other cell.

[0068] Figure 2 This is a diagram showing an example of determining the SS block in the case of synchronous NW. This example shows the time resources of the SS block in the state where other cells are synchronized with the serving cell. The serving cell is synchronized with other cells (e.g., neighboring cells of the serving cell) #0, #1, and #2, and the beginning of the specified SS burst set period is consistent between the cells.

[0069] The serving cell is sent multiple SS bursts within the SS burst set period, and one SS burst includes five SS blocks. The other cell #0 has the same SS burst set period as the serving cell, and one SS burst includes four SS blocks. The other cell #1 has a longer (e.g., 2 times) SS burst set period than the serving cell, and the other cell #2 has a shorter (e.g., half) SS burst set period than the serving cell.

[0070] In Figure 2In the case of cell synchronization shown in FIG. 1 , the UE detects the SS block in other cell #0 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 other cell #0 and detects the first SS block. If the PBCH included in the first SS block (SS#1) is decoded, the time index of the SS block (SS#1) is determined, but in this example, the timing information (equivalent to the SS block time index) of the SS block (SS#1) is determined without decoding the PBCH.

[0071] For example, the UE determines whether the detection timing of the first SS block (SS#1) is consistent with a certain frame, time slot and / or symbol timing in the serving cell. If it is found out which frame, time slot and / or symbol timing in the serving cell the first SS block (SS#1) in the other cell #0 is consistent with, it is possible to understand which frame, time slot and / or symbol timing in the other cell #0 the first SS block (SS#1) corresponds to.

[0072] In this way, for the first SS block (SS#1) of other cell #0, the frame, time slot and / or symbol timing in other cell #0 is understood. Therefore, the UE can know the timing of the detected SS block in other cell #0 and the frame and time slot boundaries of other cell #0 without reading the time index from the PBCH of the first SS block (SS#1) of other cell #0.

[0073] like Figure 2 As shown, other cells #1 and #2 are cells with different SS burst set periods compared to the serving cell. As with other cell #0, the frame, time slot and / or symbol timing in other cells #1 and #2 can be determined with respect to the detected SS blocks. For example, it is assumed that the UE detects the synchronization signal of the second SS block (SS#2) among the multiple SS blocks included in the SS burst in other cell #1 and detects the second SS block (SS#2).

[0074] The UE determines whether the detection timing of the second SS block (SS#2) that is the object corresponds to a certain frame, time slot and / or symbol timing in the serving cell. The SS burst set period of other cell #1 is longer than that of the serving cell, but since the UE knows the frame, time slot and / or symbol timing of the serving cell, it can determine the timing of the SS block detected in other cell #1 in the same way as above.

[0075] Furthermore, the UE determines whether the frame, time slot and / or symbol timing corresponding to the SS block detected in the serving cell corresponds to a certain frame, time slot and / or symbol timing in the original other cell #1. In this way, it is found out whether the second SS block (SS#2) that becomes the measurement object in the other cell #1 corresponds to a certain frame, time slot and / or symbol timing in the other cell #1.

[0076] When the UE performs RRM measurements (for example, RSRP measurements) using SS blocks in other cells, in addition to the RRM measurement results, a measurement report containing the timing information of the SS blocks in other cells (timing information based on the serving cell) and / or the index of the SS block (information derived based on the timing of the serving cell) can also be sent to the network.

[0077] The network can determine the SS block based on the timing information and / or index information of the SS block contained in the report, can judge which beam has a better quality in the UE, and can appropriately perform beam control (such as switching).

[0078] If the other cell of the measurement object applies single beam operation (single beam operation), the UE can determine the SS block in the other cell without decoding the PBCH contained in the SS block of the other cell. In the case where the single beam operation is applied to the other cell, the SS block with the same SS block index is repeatedly transmitted in the other cell with the SS burst set period. Therefore, if the synchronization signal of the SS block is detected in the other cell, it can be assumed that the detected SS block is the SS block with the same SS block index repeatedly transmitted in the other cell.

[0079] If an SS block is detected in another cell while single beam operation is applied to the other cell, the UE can determine the SS block without decoding the PBCH because it is the only SS block in the other cell. For example, the SS block is treated as a SS block with a predetermined SS block index (e.g., index #0) detected. Alternatively, the SS block index may not be determined for the detected SS block.

[0080] In addition, information related to the SS blocks used in the cell applying single beam operation (for example, SS block index) can also be specified by the specification, and can also be notified to the UE through higher layer signaling (for example, RRC signaling).

[0081] When the UE performs RRM measurements using SS blocks in other cells, it may send a measurement report including a predetermined SS block index (eg, index #0) to the network in addition to the RRM measurement results.

[0082] When the UE is not sure about the SS block index of the SS block of other cells, the UE may not include the SS block index in the report. For example, the UE may also send a report including the cell ID and the RRM measurement result to the network.

[0083] The network receives RRM measurement results of SS blocks of other cells from the UE when single beam operation is applied to other cells of the measurement object. In this case, the network knows the SS block index used in each cell, so even if the report does not contain the SS block index, the SS block can be identified and transferred to subsequent processing.

[0084] <Second embodiment>

[0085] The second embodiment applies different RRM requirements when decoding the NR-PBCH included in the SS block of other cells and when not decoding the NR-PBCH. As an RRM requirement (Radio Resource Measurement requirement), for example, at least one of the side condition of SINR, measurement time, accuracy, and number of measurement signals may also be specified.

[0086] As an additional condition of SINR, the SINR lower limit value of the cell level to be detected may also be specified. As the measurement time, the maximum delay time for measurement delay may also be specified. As the number of measurement signals, the number of cells whose measurement results are reported to the network, the maximum number of cells, etc. may also be specified.

[0087] For example, when the UE determines whether to decode the NR-PBCH contained in the SS block of other cells based on the specified information, and the result is that when the NR-PBCH of the SS block is decoded, the RRM requirements that are relaxed compared to the case where the UE does not decode the NR-PBCH of the SS block are applied.

[0088] As an example, assume that a UE measures an inactive SCC (e.g., RRM measurement) and reports the measurement results to the network. The network may also control the setting state (active state or inactive state) of the SCC based on the measurement results reported from the UE.

[0089] When the UE decodes the NR-PBCH included in the SS block of other cells, at least one of the requirements for measurement delay, the additional conditions of SINR, and the number of cells to be reported may be relaxed. For example, when the UE decodes the NR-PBCH of the SS block of other cells, it may report the measurement results of a smaller number of cells than when the NR-PBCH is not decoded.

[0090] According to the second embodiment, when decoding the NR-PBCH of the SS block, the UE can apply RRM requirements that are relaxed compared to the case where the NR-PBCH of the SS block is not decoded, thereby suppressing the increase in the load in the UE when performing communication control based on the SS block.

[0091] In the above method, the UE decodes the PBCH contained in the SS block of other cells and reads the time index, and reports the time index to the network. In other methods, the UE does not read the time index from the PBCH of the SS block, but can also report the index equivalent to the SS block time index to the network.

[0092] Specifically, when the UE detects the SS block of another cell based on the synchronization signal of the SS block of the other cell, it does not decode the PBCH of the SS block, but detects the time offset from the prescribed timing of the serving cell as the detection timing of the SS block. In addition, the UE reports the detected time offset (also referred to as a time index) to the network as an index equivalent to the SS block time index.

[0093] Figure 3 1 is a diagram showing an example of determining the SS block in the second embodiment. In this example, as the detection timing of the SS block of another cell, an index indicated by a time offset from the prescribed timing of the serving cell is reported. Figure 3 In the example, the serving cell and the other cell #0 are in an asynchronous state. In addition, the serving cell and the other cell #0 may also be synchronized.

[0094] In the serving cell, multiple SS burst sets are configured with an SS burst set period, and five SS blocks are sent in one SS burst set. On the other hand, other cell #0 is asynchronous with respect to the serving cell, and the number of SS blocks constituting one SS burst set is different from that of the serving cell. In addition, time indexes (#0, ..., #n, ...) are specified based on the specified timing of the serving cell.

[0095] exist Figure 3In the example shown, the time index is determined based on the starting timing of the SS burst set cycle in the serving cell. Specifically, in other cell #0, the starting SS block of a certain SS burst set cycle corresponds to the time index #n. In addition, 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 is also switched to a small value when reaching the beginning of the SS burst set cycle in the serving cell.

[0096] 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 the RSRP of the SS block unit and reports the RSRP measurement result to the network in the SS block unit.

[0097] When reporting the RSRP measurement result of the detected SS block to the network, the time index is not read from the PBCH of the SS block, but the time index based on the prescribed timing of the serving cell is used. For example, when the SS block at the beginning of the SS burst set period is detected in other cell #0, the time index #n based on the serving cell is reported.

[0098] In this way, if each SS block is detected in other cell #0, the time index based on the serving cell is reported, so the burden on the UE will not be increased, and the network can obtain information equivalent to the SS block time index detected from the PBCH.

[0099] In addition, when multiple SS blocks are detected in other cells, time indices related to these multiple SS blocks may be reported to the network separately. In this case, it is preferred that the measurement results of each detected SS block are not averaged, etc., but individual measurement values ​​are reported separately.

[0100] <Third Embodiment>

[0101] The third embodiment is an example of not relying on predetermined information and never reading the time index of the SS blocks of other cells from the PBCH. The third embodiment does not require the SS block index for identifying each SS block for reporting the cell measurement results in other cells.

[0102] When the UE does not decode the PBCH included in the SS block of the other cell, the UE performs the following control: in the measurement report using the SS block of the other cell, at least a part of the index for determining the SS block of the other cell is not included. The UE can also include the SS block index for determining the SS block of the serving cell in the measurement report using the SS block.

[0103] For example, the UE may also assume that the UE requests the RSRP measurement results and SS block index in SS block units in the serving cell, but does not request the RSRP measurement results and SS block index in SS block units for other cells.

[0104] In the case where the UE detects SS blocks of multiple other cells, if these SS blocks have the same cell ID, the cell-level RSRP associated with the cell ID may also be reported. Alternatively, in the case where the UE detects SS blocks of multiple other cells, if these SS blocks have the same cell ID, the upper N SS block-level RSRPs among the RSRPs of the SS block units may also be reported.

[0105] The UE may combine these two methods and report one cell-level RSRP together with the cell ID for one cell ID, and report the top N SS-block-level RSRPs among the RSRPs in SS-block units without an SS-block index.

[0106] In the third embodiment, the SS block index read from the PBCH of the SS block is not required, but information obtained in the process before decoding the PBCH of the SS block may be reported. For example, it is assumed that in the case where the SS block index is implicitly expressed, information for determining a part of the SS block is obtained in the process before decoding the PBCH of the SS block.

[0107] In addition, information used to identify a part of the SS block can also be obtained through the sequence of signals (PSS / SSS / PBCH) and / or specified signals (for example, specified reference signals) contained in the SS block, time and / or frequency resources, scrambling ID, etc.

[0108] For example, when the SS burst index is implicitly used to show the time index of the SS block, if the SS burst index can be obtained even without decoding the PBCH, the SS burst index can also be reported to the network together with the RSRP at the SS block level.

[0109] According to the third embodiment described above, for example, the UE assigns an SS block index to the SS block level measurement result for the serving cell and reports it. On the other hand, it is possible not to report the SS block level measurement result for other cells, or to report the upper N SS block level RSRPs for one cell ID, thereby reducing the burden of decoding the PBCH of other cells in the UE.

[0110] (Wireless Communication System)

[0111] Hereinafter, a configuration of a wireless communication system according to an embodiment of the present invention will be described. In this wireless communication system, communication is performed using one or a combination of the wireless communication methods according to the above-described embodiments of the present invention.

[0112] Figure 4 This is a diagram showing an example of a schematic structure of a wireless communication system according to an embodiment of the present invention. In the wireless communication system 1, carrier aggregation (CA) and / or dual connectivity (DC) can be applied to integrate multiple basic frequency blocks (component carriers) with a system bandwidth (e.g., 20 MHz) of an LTE system as one unit.

[0113] In addition, the wireless communication system 1 may also be referred to as LTE (Long Term Evolution), LTE-A (LTE-Advanced), LTE-B (LTE-Beyond), SUPER3G, 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., and may also be referred to as a system that implements them.

[0114] The wireless communication system 1 includes a wireless base station 11 that forms a macro cell C1 with a relatively wide coverage, and wireless base stations 12 (12a-12c) that are arranged in the macro cell C1 and form small cells C2 that are narrower than the macro cell C1. In addition, user terminals 20 are arranged in the macro cell C1 and each small cell C2. The arrangement and number of each cell and user terminal 20 are not limited to the illustrated form.

[0115] The user terminal 20 can connect to both the radio base station 11 and the radio base station 12. It is assumed that the user terminal 20 uses both the macro cell C1 and the small cell C2 using CA or DC. In addition, the user terminal 20 may also use multiple cells (CCs) (e.g., 5 or less CCs, 6 or more CCs) to apply CA or DC.

[0116] The user terminal 20 and the wireless base station 11 can communicate with each other using a carrier with a narrow bandwidth (also called an existing carrier, a legacy carrier, etc.) at a relatively low frequency band (for example, 2 GHz). On the other hand, the user terminal 20 and the wireless base station 12 can also use a carrier with a wide bandwidth at a relatively high frequency band (for example, 3.5 GHz, 5 GHz, etc.), or can use the same carrier as that between the user terminal 20 and the wireless base station 11. In addition, the structure of the frequency band used by each wireless base station is not limited to this.

[0117] In addition, the user terminal 20 can communicate in each cell using time division duplex (TDD) and / or frequency division duplex (FDD). In addition, a single parameter set (Numerology) or a plurality of different parameter sets may be applied to each cell (carrier).

[0118] The wireless base station 11 and the wireless base station 12 (or two wireless base stations 12) may be connected via wire (eg, optical fiber conforming to CPRI (Common Public Radio Interface), X2 interface, etc.) or wirelessly.

[0119] The wireless base station 11 and each wireless base station 12 are connected to the upper station device 30, and are connected to the core network 40 via the upper station device 30. In addition, the upper station device 30 includes, for example, an access gateway device, a radio network controller (RNC), a mobility management entity (MME), etc., but is not limited thereto. In addition, each wireless base station 12 can also be connected to the upper station device 30 via the wireless base station 11.

[0120] In addition, the wireless base station 11 is a wireless base station with a relatively wide coverage range, and may also be referred to as a macro base station, a convergence node, an eNB (eNodeB), a transmission and reception point, etc. In addition, the wireless base station 12 is a wireless base station with a local coverage range, and may also be referred to as 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 and reception point, etc. Hereinafter, when the wireless base stations 11 and 12 are not distinguished, they are collectively referred to as wireless base stations 10.

[0121] Each user terminal 20 is a terminal that supports various communication methods such as LTE and LTE-A, and includes not only mobile communication terminals (mobile stations) but also fixed communication terminals (fixed stations).

[0122] In the wireless communication system 1 , as radio access schemes, Orthogonal Frequency Division Multiple Access (OFDMA) is applied to downlink, and Single Carrier Frequency Division Multiple Access (SC-FDMA) and / or OFDMA is applied to uplink.

[0123] OFDMA is a multi-carrier transmission method that divides the frequency band into multiple narrow frequency bands (subcarriers) and maps data to each subcarrier for communication. SC-FDMA is a single-carrier transmission method that divides the system bandwidth into bands consisting of one or continuous resource blocks for each terminal, and multiple terminals use different bands to reduce interference between terminals. In addition, the uplink and downlink wireless access methods are not limited to their combination, and other wireless access methods can also be used.

[0124] In the wireless communication system 1, as downlink channels, a downlink shared channel (physical downlink shared channel (PDSCH: Physical Downlink Shared Channel)), a broadcast channel (physical broadcast channel (PBCH: Physical Broadcast Channel)), a downlink L1 / L2 control channel, etc., which are shared by each user terminal 20, are used. User data, high-layer control information, SIB (System Information Block), etc. are transmitted through PDSCH. In addition, MIB (Master Information Block) is transmitted through PBCH.

[0125] Downlink L1 / L2 control channels include PDCCH (Physical Downlink Control Channel), EPDCCH (Enhanced Physical Downlink Control Channel), PCFICH (Physical Control Format Indicator Channel), PHICH (Physical Hybrid-ARQ Indicator Channel), etc. Downlink control information (downlink control information (DCI: Downlink Control Information)) including scheduling information of PDSCH and / or PUSCH is transmitted through PDCCH.

[0126] In addition, scheduling information may be notified through DCI. For example, DCI that schedules DL data reception may be referred to as DL assignment, and DCI that schedules UL data transmission may be referred to as UL grant.

[0127] The number of OFDM symbols used for PDCCH is transmitted through PCFICH. The delivery confirmation information (e.g., also called retransmission control information, HARQ-ACK, ACK / NACK, etc.) for HARQ (Hybrid Automatic Repeat reQuest) of PUSCH is transmitted through PHICH. EPDCCH is frequency-division multiplexed with PDSCH (Downlink Shared Data Channel) and is used for the transmission of DCI, etc., similar to PDCCH.

[0128] In the wireless communication system 1, as uplink channels, an uplink shared channel (physical uplink shared channel (PUSCH: Physical Uplink Shared Channel)), an uplink control channel (physical uplink control channel (PUCCH: Physical Uplink Control Channel)), a random access channel (physical random access channel (PRACH: Physical Random Access Channel)), etc., which are shared by each user terminal 20, are used. User data, high-layer control information, etc. are transmitted through PUSCH. In addition, downlink wireless quality information (channel quality indicator (CQI: Channel Quality Indicator)), delivery confirmation information, scheduling request (SR: Scheduling Request), etc. are transmitted through PUCCH. A random access preamble code for establishing a connection with a cell is transmitted through PRACH.

[0129] In the wireless communication system 1, as downlink reference signals, a cell-specific reference signal (CRS: Cell-specific Reference Signal), a channel state information reference signal (CSI-RS: Channel State Information-Reference Signal), a demodulation reference signal (DMRS: DeModulation Reference Signal), a positioning reference signal (PRS: Positioning Reference Signal), etc. are transmitted. In addition, in the wireless communication system 1, as uplink reference signals, a measurement reference signal (sounding reference signal (SRS: Sounding Reference Signal)), a demodulation reference signal (DMRS), etc. are transmitted. In addition, DMRS can also be called a user terminal specific reference signal (UE-specific Reference Signal). In addition, the reference signals transmitted are not limited to this.

[0130] (Wireless Base Station)

[0131] Figure 5 1 is a diagram showing an example of the overall configuration of a wireless base station according to an embodiment of the present invention. The wireless base station 10 includes a plurality of transmitting and receiving antennas 101, an amplifier unit 102, a transmitting and receiving unit 103, a baseband signal processing unit 104, a call processing unit 105, and a transmission path interface 106. In addition, each of the transmitting and receiving antennas 101, the amplifier unit 102, and the transmitting and receiving unit 103 may be configured to include one or more.

[0132] User data transmitted from the radio base station 10 to the user terminal 20 via the downlink is input from the upper station apparatus 30 to the baseband signal processing unit 104 via the transmission path interface 106 .

[0133] In the baseband signal processing unit 104, for user data, transmission processing such as PDCP (Packet Data Convergence Protocol) layer processing, user data segmentation and combination, RLC (Radio Link Control) retransmission control and other RLC layer transmission processing, MAC (Medium Access Control) retransmission control (for example, HARQ transmission processing), scheduling, transmission format selection, channel coding, inverse fast Fourier transform (IFFT: Inverse Fast Fourier Transform) processing, precoding processing, etc. are performed and forwarded to the transmission and reception unit 103. In addition, for downlink control signals, transmission processing such as channel coding and inverse fast Fourier transform are also performed and forwarded to the transmission and reception unit 103.

[0134] The transmitting and receiving unit 103 converts the baseband signal outputted by the baseband signal processing unit 104 after precoding for each antenna into a radio frequency band and transmits it. The radio frequency signal after the frequency conversion by the transmitting and receiving unit 103 is amplified by the amplifier unit 102 and transmitted from the transmitting and receiving antenna 101. The transmitting and receiving unit 103 can be composed of a transmitter / receiver, a transmitting and receiving circuit, or a transmitting and receiving device described based on the common knowledge in the technical field involved in the present invention. In addition, the transmitting and receiving unit 103 can also be composed of an integrated transmitting and receiving unit, or a transmitting unit and a receiving unit.

[0135] On the other hand, regarding the uplink signal, the radio frequency signal received by the transmitting / receiving antenna 101 is amplified by the amplifier unit 102. The transmitting / receiving unit 103 receives the uplink signal amplified by the amplifier unit 102. The transmitting / receiving unit 103 performs frequency conversion on the received signal to obtain a baseband signal, and outputs it to the baseband signal processing unit 104.

[0136] In the baseband signal processing unit 104, the user data included in the input uplink signal is subjected to fast Fourier transform (FFT: Fast Fourier Transform) processing, inverse discrete Fourier transform (IDFT: Inverse Discrete Fourier Transform) processing, error correction decoding, MAC retransmission control reception processing, RLC layer and PDCP layer reception processing, and is forwarded to the upper station device 30 via the transmission path interface 106. The call processing unit 105 performs call processing (setting, release, etc.) of the communication channel, state management of the wireless base station 10, management of wireless resources, etc.

[0137] The transmission path interface 106 transmits and receives signals with the upper station device 30 via a predetermined interface. In addition, the transmission path interface 106 may transmit and receive signals (backhaul signaling) with other wireless base stations 10 via an inter-base station interface (e.g., an optical fiber or an X2 interface in accordance with CPRI (Common Public Radio Interface)).

[0138] In addition, the transmitting and receiving unit 103 may also include an analog beamforming unit for performing analog beamforming. The analog beamforming unit may also be composed of an analog beamforming circuit (e.g., a phase shifter, a phase shifting circuit) or an analog beamforming device (e.g., a phase shifting device) described based on common knowledge in the technical field involved in the present invention. In addition, the transmitting and receiving antenna 101 may also be composed of an array antenna, for example.

[0139] The transmission and reception unit 103 may transmit a signal using a transmission beam, and may receive a signal using a reception beam. The transmission and reception unit 103 may transmit and / or receive a signal using a predetermined beam determined by the control unit 301 .

[0140] The transmitting and receiving unit 103 transmits one or more synchronization signal blocks (SS blocks) including synchronization signals (e.g., NR-PSS, NR-SSS, etc.) and broadcast channels (e.g., NR-PBCH). The transmitting and receiving unit 103 may also use different multiple SS blocks to transmit NR-PBCH having the same content and / or structure.

[0141] The sending and receiving unit 103 can also send to the user terminal 20 an indication of whether to decode the PBCH contained in the SS block of other cells, information about whether the other cells of the measurement object are synchronized with the service cell, information related to whether the other cells of the measurement object apply single beam operation, etc.

[0142] The transmitting and receiving unit 103 may also receive a cell-level and / or SS-block-level measurement report from the user terminal 20 .

[0143] Figure 6 This is a diagram showing an example of a functional configuration of a wireless base station according to an embodiment of the present invention. In this example, the functional blocks of the characteristic parts of this embodiment are mainly shown, and it is also assumed that the wireless base station 10 also has other functional blocks required for wireless communication.

[0144] The baseband signal processing unit 104 includes at least a control unit (scheduler) 301, a transmission signal generating unit 302, a mapping unit 303, a reception signal processing unit 304, and a measuring unit 305. In addition, these structures may be included in the wireless base station 10, and some or all of the structures may not be included in the baseband signal processing unit 104.

[0145] The control unit (scheduler) 301 controls the entire wireless base station 10. The control unit 301 can be configured by a controller, a control circuit, or a control device described based on common knowledge in the technical field to which the present invention relates.

[0146] The control unit 301 controls, for example, signal generation in the transmission signal generating unit 302 and signal allocation in the mapping unit 303. The control unit 301 also controls signal reception processing in the reception signal processing unit 304 and signal measurement in the measuring unit 305.

[0147] The control unit 301 controls the scheduling (e.g., resource allocation) of system information, downlink data signals (e.g., signals sent via PDSCH), and downlink control signals (e.g., signals sent via PDCCH and / or EPDCCH. Delivery confirmation information, etc.). In addition, the control unit 301 controls the generation of downlink control signals, downlink data signals, etc. based on the result of determining whether retransmission control of uplink data signals is necessary, etc. In addition, the control unit 301 controls the scheduling of synchronization signals (e.g., PSS (Primary Synchronization Signal) / SSS (Secondary Synchronization Signal)), downlink reference signals (e.g., CRS, CSI-RS, DMRS), etc.

[0148] In addition, the control unit 301 controls the scheduling of uplink data signals (for example, signals sent via PUSCH), uplink control signals (for example, signals sent via PUCCH and / or PUSCH. Delivery confirmation information, etc.), random access preamble codes (for example, signals sent via PRACH), uplink reference signals, etc.

[0149] The control unit 301 may also perform the following control: using the digital BF (e.g., precoding) in the baseband signal processing unit 104 and / or the analog BF (e.g., phase rotation) in the transmitting and receiving unit 103 to form a transmission beam and / or a reception beam. The control unit 301 may also perform the following control: forming a beam based on downlink propagation path information, uplink propagation path information, etc. Such propagation path information may also be obtained from the receiving signal processing unit 304 and / or the measuring unit 305.

[0150] The control unit 301 may also 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.

[0151] In addition, the control unit 301 sets the SS blocks so that a predetermined SS burst set is implemented for each of the serving cell and the other cells (see Figure 1 ). In each SS block, the synchronization signal and PBCH are scheduled. For example, the sending and receiving timing of each cell can also be controlled so that Figure 2 As shown, the serving cell is synchronized with other cells #0, #1, and #2.

[0152] In addition, the control unit 301 may also receive reports of measurement results (eg, cell-level measurement results, SS block-level measurement results) in the serving cell and other cells from the user terminal 20 .

[0153] For example, the control unit 301 may also receive the RSRP measurement results in other cells of the measurement object and the timing information of the SS blocks in the other cells (timing information based on the serving cell) when the other cells of the measurement object are synchronized with the serving cell. In this case, the SS block of the reported RSRP measurement result is determined according to the timing information of the SS block. The control unit 301 may also perform the following control, etc.: based on the received measurement results, determine which beam has good quality in the user terminal 20 and change the beam.

[0154] In addition, the control unit 301 may also receive RSRP measurement results of SS blocks in other cells from the user terminal 20 when other cells of the measurement object apply single beam operation. In this case, even in a report without an SS block index, the control unit 301 knows that the other cells are single beam, and thus can determine the SS block.

[0155] In addition, the control unit 301 may also assume different RRM requirements for measurements in other cells when the user terminal 20 decodes the PBCH included in the SS block of other cells and when the PBCH is not decoded. For example, when the PBCH included in the SS block of other cells is decoded in the user terminal 20, the control unit 301 may also assume that at least one of the side conditions of SINR, measurement time, accuracy, and number of measurement signals is relaxed.

[0156] In addition, when the user terminal 20 detects each SS block in other cells and reports a time index based on the serving cell, the control unit 301 can also determine the SS block detected by the user terminal 20 in other cells based on the time index.

[0157] Furthermore, when the user terminal 20 reports information obtained in a process before decoding the PBCH of the SS block, the control unit 301 may determine the SS block detected by the user terminal 20 in other cells based on the information.

[0158] The transmission signal generating unit 302 generates a downlink signal (downlink control signal, downlink data signal, downlink reference signal, etc.) based on the instruction from the control unit 301, and outputs it to the mapping unit 303. The transmission signal generating unit 302 can be composed of a signal generator, a signal generating circuit, or a signal generating device explained based on the common knowledge in the technical field involved in the present invention.

[0159] The transmission signal generating unit 302 generates, for example, a DL allocation for notifying allocation information of downlink data and / or a UL grant for notifying allocation information of uplink data based on an instruction from the control unit 301. Both the DL allocation and the UL grant are DCIs, and follow the corresponding DCI format. In addition, in the downlink data signal, coding processing and modulation processing are performed according to the coding rate and modulation method determined based on the channel state information (CSI: Channel State Information) from each user terminal 20.

[0160] Based on the instruction from the control unit 301, the mapping unit 303 maps the downlink signal generated by the transmission signal generation unit 302 to a predetermined wireless resource and outputs it to the transmission and reception unit 103. The mapping unit 303 can be composed of a mapper, a mapping circuit or a mapping device described based on the common knowledge in the technical field involved in the present invention.

[0161] The received signal processing unit 304 performs reception processing (e.g., demapping, demodulation, decoding, etc.) on the received signal input from the transmitting and receiving unit 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 explained based on the common knowledge in the technical field involved in the present invention.

[0162] The reception signal processing unit 304 outputs the information decoded by the reception processing to the control unit 301. For example, when a PUCCH including HARQ-ACK is received, the HARQ-ACK is output to the control unit 301. In addition, the reception signal processing unit 304 outputs the reception signal and / or the signal after reception processing to the measurement unit 305.

[0163] The measurement unit 305 performs measurement related to the received signal. The measurement unit 305 can be composed of a measurement device, a measurement circuit, or a measurement apparatus described based on the common knowledge in the technical field to which the present invention relates.

[0164] For example, the measuring unit 305 may also perform RRM (Radio Resource Management) measurement, CSI (Channel State Information) measurement, etc. based on the received signal. The measuring unit 305 may also measure received power (e.g., RSRP (Reference Signal Received Power)), received quality (e.g., RSRQ (Reference Signal Received Quality), SINR (Signal to Interference plus Noise Ratio), SNR (Signal to Noise Ratio)), signal strength (e.g., RSSI (Received Signal Strength Indicator)), propagation path information (e.g., CSI), etc. The measurement result may also be output to the control unit 301.

[0165] (User Terminal)

[0166] Figure 7 1 is a diagram showing an example of the overall structure of a user terminal according to an embodiment of the present invention. The user terminal 20 includes a plurality of transmit / receive antennas 201, an amplifier unit 202, a transmit / receive unit 203, a baseband signal processing unit 204, and an application unit 205. In addition, each of the transmit / receive antennas 201, the amplifier unit 202, and the transmit / receive unit 203 may be configured to include one or more.

[0167] The radio frequency signal received by the transmitting and receiving antenna 201 is amplified by the amplifier unit 202. The transmitting and receiving unit 203 receives the downlink signal amplified by the amplifier unit 202. The transmitting and receiving unit 203 performs frequency conversion on the received signal to become a baseband signal, and outputs it to the baseband signal processing unit 204. The transmitting and receiving unit 203 can be composed of a transmitter / receiver, a transmitting and receiving circuit, or a transmitting and receiving device described based on the common understanding in the technical field involved in the present invention. In addition, the transmitting and receiving unit 203 can also be composed of an integrated transmitting and receiving unit, or a transmitting unit and a receiving unit.

[0168] The baseband signal processing unit 204 performs FFT processing, error correction decoding, reception processing of retransmission control, etc. on the input baseband signal. The downlink user data is forwarded to the application unit 205. The application unit 205 performs processing related to the layer higher than the physical layer and the MAC layer, etc. In addition, broadcast information among the downlink data can also be forwarded to the application unit 205.

[0169] On the other hand, user data for uplink is input from the application unit 205 to the baseband signal processing unit 204. In the baseband signal processing unit 204, transmission processing of retransmission control (for example, transmission processing of HARQ), channel coding, precoding, discrete Fourier transform (DFT: Discrete Fourier Transform) processing, IFFT processing, etc. are performed and forwarded to the transmission and reception unit 203. The transmission and reception unit 203 converts the baseband signal output from the baseband signal processing unit 204 into a radio frequency band and transmits it. The radio frequency signal after the frequency conversion by the transmission and reception unit 203 is amplified by the amplifier unit 202 and transmitted from the transmission and reception antenna 201.

[0170] In addition, the transmitting and receiving unit 203 may also include an analog beamforming unit for performing analog beamforming. The analog beamforming unit may also be composed of an analog beamforming circuit (e.g., a phase shifter, a phase shifting circuit) or an analog beamforming device (e.g., a phase shifting device) described based on common knowledge in the technical field involved in the present invention. In addition, the transmitting and receiving antenna 201 may also be composed of an array antenna, for example.

[0171] The transmission and reception unit 203 may transmit a signal using a transmission beam, and may receive a signal using a reception beam. The transmission and reception unit 203 may transmit and / or receive a signal using a predetermined beam determined by the control unit 401 .

[0172] The transmitting and receiving unit 203 receives one or more synchronization signal blocks (SS blocks) including a synchronization signal (e.g., NR-PSS, NR-SSS, etc.) and a broadcast channel (e.g., NR-PBCH).

[0173] The sending and receiving unit 203 can also receive from the wireless base station 10 an indication of whether to decode the PBCH contained in the SS block of other cells, information related to whether the other cells of the measurement object are synchronized with the service cell, information related to whether the other cells of the measurement object apply single beam operation, etc.

[0174] The transmitting and receiving unit 203 may also transmit a cell-level and / or SS-block-level measurement report to the radio base station 10 .

[0175] Figure 8 1 is a diagram showing an example of a functional configuration of a user terminal according to an embodiment of the present invention. In this example, the functional blocks of the characteristic parts of this embodiment are mainly shown, and it is also assumed that the user terminal 20 also has other functional blocks required for wireless communication.

[0176] The baseband signal processing unit 204 included in the user terminal 20 includes at least a control unit 401, a transmission signal generating unit 402, a mapping unit 403, a reception signal processing unit 404, and a measuring unit 405. In addition, these structures may be included in the user terminal 20, and some or all of the structures may not be included in the baseband signal processing unit 204.

[0177] The control unit 401 controls the entire user terminal 20. The control unit 401 can be configured by a controller, a control circuit, or a control device described based on common knowledge in the technical field to which the present invention relates.

[0178] The control unit 401 controls, for example, signal generation in the transmission signal generating unit 402 and signal allocation in the mapping unit 403. The control unit 401 also controls signal reception processing in the reception signal processing unit 404 and signal measurement in the measuring unit 405.

[0179] The control unit 401 obtains the downlink control signal and the downlink data signal transmitted from the wireless base station 10 from the reception signal processing unit 404. The control unit 401 controls the generation of the uplink control signal and / or the uplink data signal based on the downlink control signal and / or the result of determining the necessity of retransmission control for the downlink data signal.

[0180] The control unit 401 may also perform the following control: using the digital BF (e.g., precoding) in the baseband signal processing unit 204 and / or the analog BF (e.g., phase rotation) in the transmitting and receiving unit 203 to form a transmission beam and / or a reception beam. The control unit 401 may also perform the following control: forming a beam based on downlink propagation path information, uplink propagation path information, etc. Such propagation path information may also be obtained from the receiving signal processing unit 404 and / or the measuring unit 405.

[0181] 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 determines whether to decode the PBCH included in the SS blocks of other cells based on predetermined information.

[0182] The prescribed information may also be an indication of whether to decode the PBCH included in the SS block of the other cell. The control unit 401 can use information related to whether the other cell of the measurement object is synchronized with the serving cell as the prescribed information. In addition, the control unit 401 can use information related to whether the other cell of the measurement object applies single beam operation as the prescribed information.

[0183] Furthermore, the control unit 401 may determine the detection timing of the SS blocks in other cells based on the prescribed timing of the serving cell without decoding the PBCH included in the SS blocks of other cells.

[0184] In addition, the control unit 401 may also perform the following control: when the PBCH included in the SS block of the other cell is not decoded, at least a part of the index for identifying the SS block of the other cell is not included in the measurement report using the SS block of the other cell. The control unit 401 may also perform the following control: the index for identifying the SS block of the serving cell is included in the measurement report using the SS block related to the serving cell, and the index for identifying the SS block of the other cell is not included in the measurement report using the SS block related to the other cell.

[0185] Furthermore, the control unit 401 may determine whether to decode the PBCH included in the SS block of the other cell based on the prescribed information, and if the PBCH included in the SS block of the other cell is decoded, apply a different RRM requirement to the measurement of the other cell (including the measurement at the SS block level) than to the case where the PBCH included in the SS block is not decoded. For example, if the PBCH included in the SS block of the other cell is decoded, a relaxed RRM requirement is applied to the measurement of the other cell compared to the case where the PBCH is not decoded.

[0186] Furthermore, when the control unit 401 acquires various information notified from the radio base station 10 from the reception signal processing unit 404 , the control unit 401 may update the parameters used for control based on the information.

[0187] The transmission signal generating unit 402 generates an uplink signal (uplink control signal, uplink data signal, uplink reference signal, etc.) based on the instruction from the control unit 401, and outputs it to the mapping unit 403. The transmission signal generating unit 402 can be composed of a signal generator, a signal generating circuit, or a signal generating device explained based on the common knowledge in the technical field involved in the present invention.

[0188] The transmission signal generating unit 402 generates, for example, an uplink control signal related to the delivery confirmation information, the channel state information (CSI), etc. based on the instruction from the control unit 401. In addition, the transmission signal generating unit 402 generates an uplink data signal based on the instruction from the control unit 401. For example, when the downlink control signal notified from the radio base station 10 includes a UL grant, the transmission signal generating unit 402 is instructed by the control unit 401 to generate an uplink data signal.

[0189] Based on the instruction from the control unit 401, the mapping unit 403 maps the uplink signal generated by the transmission signal generating unit 402 to the radio resource and outputs it to the transmission and reception unit 203. The mapping unit 403 can be composed of a mapper, a mapping circuit or a mapping device described based on the common knowledge in the technical field involved in the present invention.

[0190] The received signal processing unit 404 performs reception processing (e.g., demapping, demodulation, decoding, etc.) on the received signal input from the transmitting and receiving unit 203. Here, the received signal is, for example, a downlink signal (downlink control signal, downlink data signal, downlink reference signal, etc.) transmitted from the wireless 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 described based on the common knowledge in the technical field involved in the present invention. In addition, the received signal processing unit 404 can constitute the receiving unit involved in the present invention.

[0191] The received signal processing unit 404 outputs the information decoded by the reception processing to the control unit 401. The received signal processing unit 404 outputs, for example, broadcast information, system information, RRC signaling, DCI, etc. to the control unit 401. In addition, the received signal processing unit 404 outputs the received signal and / or the received processed signal to the measurement unit 405.

[0192] The measurement unit 405 performs measurement related to the received signal. The measurement unit 405 can be composed of a measurement device, a measurement circuit, or a measurement apparatus described based on the common knowledge in the technical field to which the present invention relates.

[0193] For example, the measuring unit 405 may also perform RRM measurement, CSI measurement, etc. based on the received signal. The measuring unit 405 may also measure received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc. The measurement result may also be output to the control unit 401.

[0194] (Hardware Structure)

[0195] In addition, the block diagram used for the description of the above-mentioned embodiment shows the block of the functional unit. These functional blocks (structural units) are implemented by any combination of hardware and / or software. In addition, the implementation method of each functional block is not particularly limited. That is, each functional block can also be implemented using a device that is physically and / or logically combined, or two or more devices that are physically and / or logically separated can be directly and / or indirectly (for example, using wired and / or wireless) connected and implemented using these multiple devices.

[0196] For example, a wireless base station, a user terminal, etc. in one embodiment of the present invention may also function as a computer that performs processing of the wireless communication method of the present invention. Fig. 91001, memory 1002, storage 1003, communication device 1004, input device 1005, output device 1006, bus 1007, etc.

[0197] In the following description, the word "device" can be interpreted as a circuit, device, unit, etc. The hardware configuration of the radio base station 10 and the user terminal 20 may include one or more of the devices shown in the figure, or may exclude some of the devices.

[0198] For example, only one processor 1001 is shown in the figure, but it may be a plurality of processors. In addition, the processing may be performed by one processor, or the processing may be performed by more than one processor simultaneously, sequentially, or using other methods. In addition, the processor 1001 may be implemented by more than one chip.

[0199] The various functions in the wireless base station 10 and the user terminal 20 are realized by, for example, reading the specified software (program) into hardware such as the processor 1001 and the memory 1002, and the processor 1001 performing calculations to control the communication via the communication device 1004, or controlling the reading and / or writing of data in the memory 1002 and the storage 1003.

[0200] The processor 1001 controls the entire computer by, for example, operating an operating system. The processor 1001 may also be composed of a central processing unit (CPU) including an interface with peripheral devices, a control device, a computing device, registers, etc. For example, the above-mentioned baseband signal processing unit 104 (204), call processing unit 105, etc. may also be implemented by the processor 1001.

[0201] In addition, the processor 1001 reads the program (program code), software module, data, etc. from the storage 1003 and / or the communication device 1004 to the memory 1002, and performs various processes according to them. As a program, a program that enables a computer to perform at least a part of the operations described in the above-mentioned embodiments is used. For example, the control unit 401 of the user terminal 20 can also be implemented by a control program that is stored in the memory 1002 and operates in the processor 1001, and other functional blocks can also be implemented in the same way.

[0202] The memory 1002 is a computer-readable recording medium, and may be composed of at least one of a ROM (Read Only Memory), an EPROM (Erasable Programmable ROM), an EEPROM (Electrically EPROM), a RAM (Random Access Memory), or other appropriate storage media. The memory 1002 may also be referred to as a register, a cache, a main memory (main storage device), etc. The memory 1002 can store executable programs (program codes), software modules, etc. for implementing the wireless communication method involved in one embodiment of the present invention.

[0203] The storage 1003 is a computer-readable recording medium, and may be composed of at least one of a floppy disk, a floppy (registered trademark) disk, an optical disk (e.g., a compact disk (CD-ROM (Compact Disc ROM)), a digital versatile disk, a Blu-ray (registered trademark) disk), a removable disk, a hard disk drive, a smart card, a flash memory device (e.g., a card, a stick, a key drive), a magnetic stripe, a database, a server, and other appropriate storage media. The storage 1003 may also be referred to as an auxiliary storage device.

[0204] The communication device 1004 is hardware (transmitting and receiving device) for communicating between computers via a wired and / or wireless network, and is also called a network device, a network controller, a network card, a communication module, etc. The communication device 1004 may also be configured to implement frequency division duplex (FDD: Frequency Division Duplex) and / or time division duplex (TDD: Time Division Duplex), including a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. For example, the above-mentioned transmitting and receiving antenna 101 (201), amplifier unit 102 (202), transmitting and receiving unit 103 (203), transmission path interface 106, etc. may also be implemented by the communication device 1004.

[0205] The input device 1005 is an input device that receives input from the outside (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.). The output device 1006 is an output device that implements output to the outside (e.g., a display, a speaker, an LED (Light Emitting Diode) lamp, etc.). In addition, the input device 1005 and the output device 1006 may also be an integrated structure (e.g., a touch panel).

[0206] In addition, the processor 1001, the memory 1002 and other devices are connected via a bus 1007 for communicating information. The bus 1007 may be configured using a single bus or may be configured using different buses for each device.

[0207] In addition, the wireless base station 10 and the user terminal 20 may also include hardware such as a microprocessor, a digital signal processor (DSP), an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), and an FPGA (Field Programmable Gate Array), and the like, and may also use the hardware to implement a part or all of each functional block. For example, the processor 1001 may also be installed using at least one of these hardware.

[0208] (Variation Example)

[0209] In addition, the terms described in this specification and / or the terms required for understanding this specification may also be replaced with terms having the same or similar meanings. For example, a channel and / or a code element may also be a signal (signaling). In addition, a signal may also be a message. A reference signal may also be referred to as RS (Reference Signal), or may be referred to as a pilot (Pilot), a pilot signal, etc. depending on the applied standard. In addition, a component carrier (CC) may also be referred to as a cell, a frequency carrier, a carrier frequency, etc.

[0210] In addition, a wireless frame may also be composed of one or more periods (frames) in the time domain. The one or more periods (frames) constituting a wireless frame may also be referred to as a subframe. Furthermore, a subframe may also be composed of one or more time slots in the time domain. A subframe may also be a fixed time length (e.g., 1 ms) that is not dependent on a parameter set.

[0211] Furthermore, a time slot may also be composed of one or more symbols (OFDM (Orthogonal Frequency Division Multiplexing)) symbols, SC-FDMA (Single Carrier Frequency Division Multiple Access)) symbols, etc.) in the time domain. In addition, a time slot may also be a time unit based on a parameter set. In addition, a time slot may also include multiple mini-time slots. Each mini-time slot may also be composed of one or more symbols in the time domain. In addition, a mini-time slot may also be called a sub-time slot.

[0212] Radio frames, subframes, time slots, mini-slots, and symbols all represent time units for signal transmission. Radio frames, subframes, time slots, mini-slots, and symbols may also use other names corresponding to them. For example, 1 subframe may also be called a transmission time interval (TTI), multiple consecutive subframes may also be called TTI, and 1 time slot or 1 mini-slot may also be called TTI. In other words, a subframe and / or TTI may also be a subframe (1ms) in an existing LTE, or a period shorter than 1ms (for example, 1-13 symbols), or a period longer than 1ms. In addition, the unit representing TTI may also be called a time slot, a mini-slot, etc. instead of a subframe.

[0213] Here, TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in the LTE system, a wireless base station schedules each user terminal to allocate wireless resources (frequency bandwidth, transmission power, etc. that can be used in each user terminal) in TTI units. In addition, the definition of TTI is not limited to this.

[0214] TTI may also be a transmission time unit for data packets (transport blocks), code blocks, and / or code words after channel coding, and may also be a processing unit for scheduling, link adaptation, etc. In addition, when a TTI is given, the time interval (e.g., the number of symbols) to which a transport block, code block, and / or code word is actually mapped may also be shorter than the TTI.

[0215] In addition, when 1 time slot or 1 mini time slot is called TTI, more than 1 TTI (i.e., more than 1 time slot or more than 1 mini time slot) can also be the minimum time unit of scheduling. In addition, the number of time slots (mini time slots) constituting the minimum time unit of scheduling can also be controlled.

[0216] A TTI having a time length of 1 ms may also be referred to as a normal TTI (TTI in LTE Rel.8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, or a long subframe, etc. A TTI shorter than a normal TTI may also be referred to as a shortened TTI, a short TTI, a partial TTI (partial or fractional TTI), a shortened subframe, a short subframe, a mini slot, or a subslot, etc.

[0217] In addition, a long TTI (e.g., normal TTI, subframe, etc.) can also be interpreted as a TTI with a time length exceeding 1 ms, and a short TTI (e.g., shortened TTI, etc.) can also be interpreted as a TTI with a TTI length shorter than that of a long TTI and longer than 1 ms.

[0218] Resource Block (RB) is a resource allocation unit in the time domain and frequency domain, and may also include one or more continuous sub-carriers (subcarriers) in the frequency domain. In addition, RB may also include one or more symbols in the time domain, and may be 1 time slot, 1 mini-time slot, 1 subframe or 1TTI in length. 1TTI and 1 subframe may also be composed of one or more resource blocks, respectively. In addition, one or more RBs may also be referred to as physical resource blocks (PRBs), sub-carrier groups (SCGs), resource element groups (REGs), PRB pairs, RB pairs, etc.

[0219] In addition, a resource block may be composed of one or more resource elements (REs). For example, 1 RE may be a radio resource region of 1 subcarrier and 1 symbol.

[0220] In addition, the structures of the above-mentioned radio frames, subframes, time slots, mini-time slots, and symbols are merely examples. For example, the number of subframes included in a radio frame, the number of time slots per subframe or radio frame, the number of mini-time slots included in a time slot, the number of symbols and RBs included in a time slot or mini-time slot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the cyclic prefix (CP: Cyclic Prefix) length, and the like can be variously changed.

[0221] In addition, the information, parameters, etc. described in this specification may be expressed using absolute values, relative values ​​from a specified value, or other corresponding information. For example, wireless resources may be indicated by a specified index.

[0222] The names used for parameters, etc. in this specification are not restrictive names at all. For example, various channels (PUCCH (Physical Uplink Control Channel), PDCCH (Physical Downlink Control Channel), etc.) and information elements can be identified by any suitable names, so the various names assigned to these various channels and information elements are not restrictive names at all.

[0223] The information, signals, etc. described in this specification may also be represented using one of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be mentioned across the entirety of the above description may also be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any combination thereof.

[0224] In addition, information, signals, etc. can be output from a high layer to a low layer, and / or from a low layer to a high layer. Information, signals, etc. can also be input and output via multiple network nodes.

[0225] The input and output information, signals, etc. may also be stored in a specific location (e.g., a memory), or may be managed using a management table. The input and output information, signals, etc. may be overwritten, updated, or appended. The output information, signals, etc. may also be deleted. The input information, signals, etc. may also be sent to other devices.

[0226] The notification of information is not limited to the methods / implementations described in this specification, and other methods may also be used. For example, the notification of information may also be implemented through physical layer signaling (e.g., downlink control information (DCI: Downlink Control Information), uplink control information (UCI: Uplink Control Information)), high-layer signaling (e.g., RRC (Radio Resource Control) signaling, broadcast information (Master Information Block (MIB: Master Information Block), System Information Block (SIB: System Information Block), etc.), MAC (Medium Access Control) signaling), other signals or a combination thereof.

[0227] In addition, physical layer signaling may also be referred to as L1 / L2 (Layer 1 / Layer 2) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. In addition, RRC signaling may also be referred to as RRC message, for example, RRC connection setup (RRCConnectionSetup) message, RRC connection reconstruction (RRCConnectionReconfiguration) message, etc. In addition, MAC signaling may also be notified using, for example, a MAC control element (MAC CE (Control Element)).

[0228] Furthermore, notification of prescribed information (for example, notification of "it is X") is not limited to explicit notification, but may be performed implicitly (for example, by not notifying the prescribed information or by notifying other information).

[0229] The determination may be made using a value represented by 1 bit (0 or 1), a true or false value (Boolean value) represented by true or false, or by comparison of numerical values ​​(for example, comparison with a specified value).

[0230] Whether software is referred to as software, firmware, middleware, microcode, hardware description language, or by other names, it should be interpreted broadly to mean instructions, instruction sets, codes, code segments, program code, programs, subroutines, software modules, applications, software applications, software packages, routines, subroutines, objects, executables, execution threads, procedures, functions, etc.

[0231] In addition, software, instructions, information, etc. may also be sent and received via transmission media. For example, when software is sent from a website, server, or other remote source using wired technology (coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), etc.) and / or wireless technology (infrared, microwave, etc.), these wired technologies and / or wireless technologies are included in the definition of transmission media.

[0232] The terms "system" and "network" used in this specification are used interchangeably.

[0233] In this specification, the terms "base station (BS)", "radio base station", "eNB", "gNB", "cell", "sector", "cell group", "carrier" and "component carrier" are used interchangeably. The base station is also referred to as a fixed station, NodeB, eNodeB (eNB), access point, transmission point, reception point, femtocell, small cell, etc.

[0234] A base station can accommodate one or more (for example, three) cells (also called sectors). When a base station accommodates multiple cells, the overall coverage area of ​​the base station can be divided into multiple smaller areas, each of which can also provide communication services through a base station subsystem (for example, a small base station for indoor use (Remote Radio Head (RRH))). Terms such as "cell" or "sector" refer to a part or the entire coverage area of ​​a base station and / or a base station subsystem that provides communication services within its coverage area.

[0235] In this specification, the terms "mobile station (MS), "user terminal", "user device (UE), and "terminal" are used interchangeably. Base stations are also referred to as fixed stations, NodeBs, eNodeBs (eNBs), access points, transmission points, reception points, femtocells, and small cells.

[0236] A mobile station may also be referred to by those skilled in the art as a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communication device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a handset, a user agent, a mobile client, a client, or several other appropriate terms.

[0237] In addition, the wireless base station in this specification can also be interpreted as a user terminal. For example, the various methods / implementations of the present invention can also be applied to a structure in which the communication between a wireless base station and a user terminal is replaced by a communication between multiple user terminals (device-to-device (D2D: Device-to-Device)). In this case, it is also possible to set the user terminal 20 to have a structure with the functions of the above-mentioned wireless base station 10. In addition, the language such as "uplink" and "downlink" can also be interpreted as "side". For example, an uplink channel can also be interpreted as a side channel.

[0238] Likewise, the user terminal in this specification can also be interpreted as a wireless base station. In this case, the wireless base station 10 can also be configured to have the functions of the user terminal 20 described above.

[0239] In this specification, operations performed by a base station may also be performed by its upper node depending on the situation. In a network including one or more network nodes having a base station, various operations performed for communication with a terminal can obviously be performed by a base station, one or more network nodes other than the base station (for example, consider MME (Mobility Management Entity), S-GW (Serving-Gateway), etc., but not limited to this), or a combination thereof.

[0240] Each method / implementation method described in this specification may be used alone, in combination, or switched during execution. In addition, the processing procedures, timings, flow charts, etc. of each method / implementation method described in this specification may be swapped in order as long as there is no contradiction. For example, with respect to the method described in this specification, the elements of various steps are presented in an illustrative order, but are not limited to the specific order presented.

[0241] Each mode / implementation described in this specification can also be applied to LTE (Long Term Evolution), LTE-A (LTE-Advanced), LTE-B (LTE-Beyond), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system), FRA (Future Radio Access), New-RAT (Radio Access Technology), NR (New Radio), NX (New radio access), FX (Future generation radio access), GSM (registered trademark) (Global System for Mobile communications), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE802.16 (WiMAX (registered trademark)), IEEE 802.20, UWB (Ultra-WideBand), Bluetooth (registered trademark), systems using other appropriate wireless communication methods, and / or next-generation systems expanded based on them.

[0242] The phrase “based on” used in this specification does not mean “based only on” unless otherwise specified. In other words, the phrase “based on” means both “based only on” and “based at least on”.

[0243] Any reference to an element using the designations "first", "second", etc., as used in this specification, does not generally limit the amount or order of these elements. These designations can be used in this specification as a convenient method of distinguishing between two or more elements. Thus, a reference to a first and a second element does not mean that only two elements can be used or that the first element must precede the second element in some form.

[0244] The term "determining" used in this specification sometimes includes a variety of operations. For example, with respect to "determining", calculating, computing, processing, deriving, investigating, looking up (for example, searching in a table, database or other data structure), ascertaining, etc. may also be regarded as "determining". In addition, with respect to "determining", receiving (for example, receiving information), transmitting (for example, transmitting information), input, output, accessing (for example, accessing to data in a memory), etc. may also be regarded as "determining". In addition, with respect to "determining", resolving, selecting, choosing, establishing, comparing, etc. may also be regarded as "determining". That is to say, with respect to "determining", certain operations may also be regarded as "determining".

[0245] The terms "connected" and "coupled" or any variation thereof used in this specification mean any direct or indirect connection or combination between two or more elements, and may include the case where there is one or more intermediate elements between the two elements that are "connected" or "coupled" to each other. The combination or connection between elements may also be physical, logical, or a combination thereof. For example, "connect" may also be interpreted as "access".

[0246] In this specification, when two elements are connected, it can be considered that they are "connected" or "combined" to each other using one or more wires, cables and / or printed electrical connections, and as several non-limiting and non-inclusive examples, using electromagnetic energy with a wavelength in the wireless frequency domain, microwave region and / or light (both visible and invisible) region.

[0247] In the present specification, the term "A and B are different" may also mean "A and B are different from each other." The terms "separated from" and "bound to" may also be analyzed in the same manner.

[0248] In the present specification or claims, when the terms "including", "comprising", and their variations are used, these terms, like the term "having", mean inclusiveness. Furthermore, the term "or" used in the present specification or claims does not mean exclusive or.

[0249] The present invention has been described in detail above, but it is obvious to those skilled in the art that the present invention is not limited to the embodiments described in this specification. The present invention can be implemented as a modification and variation without departing from the purpose and scope of the present invention determined based on the description of the claims. Therefore, the description of this specification is for the purpose of illustration and does not have any restrictive meaning on the present invention.

Claims

1. A terminal, characterized in that: have: A receiving unit, receiving a synchronization signal block including a synchronization signal and a broadcast channel from a base station; as well as A control unit, which, when information indicating whether a neighboring cell is synchronized with a serving cell is notified from the base station to the terminal, derives a synchronization signal block index of a synchronization signal block sent by the neighboring cell based on the timing of the serving cell.

2. The terminal according to claim 1, characterized in that The control unit does not decode a broadcast channel included in a synchronization signal block of the neighboring cell when information indicating that the neighboring cell is synchronized with the serving cell is notified as information on whether the neighboring cell is synchronized with the serving cell.

3. The terminal according to claim 2, characterized in that The control unit applies, when not decoding the broadcast channel included in the synchronization signal block of the neighboring cell, a radio resource measurement request that is different from the case where the broadcast channel included in the synchronization signal block of the neighboring cell is decoded.

4. The terminal according to claim 3, characterized in that The control unit applies, when decoding a broadcast channel included in a synchronization signal block of the neighboring cell, a more relaxed RRM request than when not decoding the broadcast channel included in the synchronization signal block of the neighboring cell.

5. The terminal according to claim 3 or claim 4, characterized in that: The RRM request is a request for measurement.

6. A wireless communication method for a terminal, characterized in that: have: The step of receiving a synchronization signal block including a synchronization signal and a broadcast channel from a base station; and When information indicating whether a neighboring cell is synchronized with a serving cell is notified from the base station to the terminal as information on whether the neighboring cell is synchronized with the serving cell, a step is performed to derive a synchronization signal block index of a synchronization signal block sent by the neighboring cell based on the timing of the serving cell.

7. A base station, characterized in that: have: A sending unit, sending a synchronization signal block including a synchronization signal and a broadcast channel to a terminal; as well as A control unit performs the following control: in order to enable the terminal to derive a synchronization signal block index of a synchronization signal block sent by a neighboring cell based on the timing of the serving cell, as information on whether the neighboring cell is synchronized with the serving cell, information indicating that the neighboring cell is synchronized with the serving cell is notified to the terminal.

8. A system comprising a terminal and a base station, characterized in that: The terminal has: A receiving unit, receiving a synchronization signal block including a synchronization signal and a broadcast channel from the base station; as well as a control unit that, when information indicating that the neighboring cell is synchronized with the serving cell is notified from the base station to the terminal as information on whether the neighboring cell is synchronized with the serving cell, derives a synchronization signal block index of a synchronization signal block transmitted by the neighboring cell based on the timing of the serving cell, The base station has: The sending unit sends, as information on whether the neighboring cell is synchronized with the serving cell, information indicating that the neighboring cell is synchronized with the serving cell to the terminal.

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