Terminal, wireless communication method, base station and system

Abstract

To properly set up RRM measurement.SOLUTION: A terminal according to one aspect of the present invention includes: a receiving unit that receives a SIB (System Information Block) indicating parameters used for transmitting a reference signal; and a control unit that controls measurement of a specific reference signal based on the SIB in an idle mode.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a terminal and a wireless communication method in a next-generation mobile communication system. [Background technology]

[0002] In the Universal Mobile Telecommunications System (UMTS) network, Long Term Evolution (LTE) has been specified with the aim of achieving higher data rates, lower latency, and the like (Non-Patent Document 1). Furthermore, with the aim of achieving wider bandwidth and higher speeds than LTE (also referred to as LTE Rel. 8 or 9), LTE-A (LTE Advanced, also referred to as LTE Rel. 10, 11, or 12) has been specified, and successor systems to LTE (for example, also referred to as FRA (Future Radio Access), 5G (5th generation mobile communication system), NR (New Radio), NX (New radio access), FX (Future generation radio access), LTE Rel. 13, 14, 15, or later) are also being considered.

[0003] LTE Rel.10 / 11 introduces Carrier Aggregation (CA), which aggregates multiple Component Carriers (CCs) to achieve wider bandwidth. Each CC is configured using the LTE Rel.8 system bandwidth as a unit. In CA, multiple CCs of the same base station (e.g., called an evolved Node B (eNB) or Base Station (BS)) are configured in a user equipment (UE).

[0004] Meanwhile, LTE Rel. 12 also introduces Dual Connectivity (DC), in which multiple cell groups (CGs) from different radio base stations are configured in a UE. Each cell group consists of at least one cell (CC). Because DC integrates multiple CCs from different radio base stations, DC is also known as Inter-eNB CA.

[0005] In addition, LTE Rel. 8-12 introduces Frequency Division Duplex (FDD), which performs downlink (DL) transmission and uplink (UL) transmission using different frequency bands, and Time Division Duplex (TDD), which performs downlink transmission and uplink transmission using the same frequency band by switching over time. [Prior art documents] [Non-patent literature]

[0006] [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 [Problem to be solved by the invention]

[0007] Future wireless communication systems (e.g., 5G, NR) are expected to realize various wireless communication services that meet different requirements (e.g., ultra-high speed, large capacity, ultra-low latency, etc.).

[0008] For example, in 5G / NR, wireless communication services called eMBB (enhanced Mobile Broadband), mMTC (massive Machine Type Communication), URLLC (Ultra Reliable and Low Latency Communications), etc. are being considered.

[0009] In NR, the use of Radio Resource Management (RRM) measurements for mobility control is being considered. However, how to configure RRM measurements has not yet been determined. If RRM measurements are not performed appropriately, communication throughput may be degraded.

[0010] The present invention has been made in view of the above points, and one of its objects is to provide a terminal and a wireless communication method that can appropriately configure RRM measurements. [Means for solving the problem]

[0011] A terminal according to one embodiment of the present invention is characterized by having a receiving unit that receives a System Information Block (SIB) indicating parameters used for transmitting a reference signal, and a control unit that controls measurement of a specific reference signal based on the SIB in idle mode. [Effects of the Invention]

[0012] According to the present invention, RRM measurements can be appropriately configured. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 10 illustrates an example of a common resource set. [Figure 2] FIG. 10 is a diagram illustrating an example of a CSI-RS resource configuration. [Figure 3] 3A-3C are diagrams illustrating an example of RRM measurements of a serving cell. [Figure 4]4A-4C are diagrams showing an example of option A-1a. [Figure 5] 5A to 5C are diagrams showing an example of RRM measurements of neighboring cells. [Figure 6] A figure showing another example of the contents of the SIB for option A-4. [Figure 7] FIG. 10 is a diagram illustrating an example of a scenario for option C-2. [Figure 8] 1 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment of the present invention. [Figure 9] 1 is a diagram illustrating an example of the overall configuration of a radio base station according to an embodiment of the present invention. [Figure 10] FIG. 2 is a diagram illustrating an example of a functional configuration of a radio base station according to an embodiment of the present invention. [Figure 11] FIG. 2 is a diagram illustrating an example of the overall configuration of a user terminal according to an embodiment of the present invention. [Figure 12] FIG. 2 is a diagram illustrating an example of a functional configuration of a user terminal according to an embodiment of the present invention. [Figure 13] FIG. 2 is a diagram illustrating an example of the hardware configuration of a radio base station and a user terminal according to one embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0014] First, we will explain an example of mobility control in LTE. LTE Rel. 11 specifies the Coordinated Multi-Point transmission / reception (CoMP) technology, which enables a UE to measure and report on multiple transmission and reception points (TRPs) based on a Channel State Information-Reference Signal (CSI-RS), enabling dynamic point selection (DPS) that dynamically switches the TRP with which it communicates.

[0015] Note that the TRP is, for example, a base station, and may simply be called a transmission point (TP) or a reception point (RP).

[0016] In one example of the DPS procedure, first, the UE detects a cell based on a synchronization signal (PSS (Primary Synchronization Signal) / SSS (Secondary Synchronization Signal)) and a cell-specific reference signal (CRS), and then performs a radio resource management (RRM) measurement report.

[0017] In the RRM measurement report, the UE may measure, for example, received power (e.g., Reference Signal Received Power (RSRP)) and report information about the received power. Note that in this specification, "measurement report" may be used interchangeably with "measurement and / or report."

[0018] The UE is configured with multiple CSI processes (up to four) for measuring the CSI of each TRP from the serving cell. The UE measures and reports the CSI-RS transmitted from each TRP based on the CSI process configuration, and the network dynamically switches the TRP used for transmission and reception with the UE based on the report results (DPS).

[0019] In the CSI measurement report, the UE may report CSI related to at least one of a Channel Quality Indicator (CQI), a Precoding Matrix Indicator (PMI), a Precoding Type Indicator (PTI), a Rank Indicator (RI), etc.

[0020] Based on the measurement results reported by the UE, the network may determine the TRP with the highest signal reception quality at the UE and use that TRP for transmission and reception with the UE.

[0021] In this way, by using multiple CSI processes, even if the UE moves within the same cell, it can continue communication with the network by switching the TRP of the UE's communication destination without switching cells or reconfiguring RRC (Radio Resource Control) information. Management (maintenance) of communication during movement without being recognized by higher layers is also called Layer 1 / Layer 2 (L1 / L2) mobility.

[0022] In addition, when movement across cells (for example, handover across cells) occurs, L1 / L2 mobility cannot be maintained, and the connecting cell must be switched and RRC information must be reconfigured. The management (maintenance) of communication during movement recognized by higher layers is also called Layer 3 mobility (L3 mobility).

[0023] In NR DL, support for IDLE RS-based RRM measurement, which uses an IDLE RS that is always ON in both IDLE mode and CONNECTED mode, is being considered as a mobility measurement.

[0024] This idle RS may be, for example, NR-SSS, or may be NR-SSS and a DMRS (Demodulation Reference Signal) for a PBCH (Physical Broadcast Channel).

[0025] Also, support for CSI-RS based RRM measurement using CSI-RS is being considered as a mobility measurement only in connected mode. Instead of CSI-RS, other reference signals such as MRS (Mobility Reference Signal), DMRS, etc. may be used.

[0026] In CSI-RS-based RRM measurements, the presence of neighboring cells and cell IDs are detected based on NR-SS (Synchronization Signal). For a connected mode User Equipment (UE), higher layer signaling from a network (NW, e.g., a radio base station) configures idle RS-based RRM measurements and / or CSI-RS-based RRM measurements.

[0027] The following use cases are being considered for CSI-RS-based RRM measurements: · Improve measurement accuracy of cell edge UEs using CSI-RS. Similar to CoMP scenario 4, the UE identifies beams and / or TRPs (Transmission Reception Points) with common PSS / SSS using CSI-RS. · When the NR-SS beamwidth is very wide and the beam granularity is not sufficient for subsequent beam-level RSRP (Reference Signal Received Power) measurements for L1 / L2 mobility, CSI-RS is used. - Use NR-SS with wide beams for high mobility UEs and CSI-RS with narrower beams for low mobility UEs. · Use CSI-RS to measure carriers that do not use initial access (e.g., non-standalone carriers).

[0028] In LTE, RSRP measurement using CSI-RS has been supported since Rel. 12. This RSRP measurement requires explicit configuration information for each CSI-RS resource (up to 96 CSI-RS resources). For example, for each CSI-RS resource, in addition to the periodicity and time offset (DMTC: Discovery Measurement Timing Configuration), the cell ID (PCID: Physical Cell Identifier), scrambling ID, CSI-RS configuration index indicating the CSI-RS resource, subframe offset, and CSI-RS individual offset must be indicated. If explicit configuration signaling like that in LTE is applied to CSI-RS-based RRM measurement, the configuration information becomes very large.

[0029] In NR, it is considered that CSI-RS configuration will support measurements on multiple beams, reducing configuration overhead, measurement reporting overhead, and UE load, and that at least dedicated RRC signaling will be supported for CSI-RS configuration.

[0030] If only dedicated RRC signaling is supported, all CSI-RS configurations to be measured from the serving cell and neighboring cells are signaled to the UE individually, which results in a large overhead in signaling the CSI-RS configurations.

[0031] Therefore, the present inventors have investigated a method for realizing CSI-RS-based RRM measurement while minimizing the overhead of configuration and / or reporting.

[0032] Specifically, NR supports common resource configuration information that indicates a common configuration for multiple CSI-RSs for CSI-RS-based RRM measurements. The common resource configuration information includes information on a common resource set (e.g., a time / frequency resource pool), which is a set of resources available for RRM measurements, and at least one parameter: the periodicity of the common resource set, the time offset of the common resource set, and the assumed antenna port. The time / frequency resource pool indicates multiple time and frequency resources for CSI-RSs. The time / frequency resource pool may also be referred to as a pattern of time and frequency resources. Antenna ports may be associated with orthogonal codes for code division multiplexing (CDM).

[0033] The common resource set may include a CSI-RS resource configuration indicating CSI-RS resources in units of a predetermined time length and a predetermined bandwidth. For example, as shown in FIG. 1, the common resource set may have a configuration in which a CSI-RS resource configuration in units of one slot and one PRB is repeated across multiple slots and / or multiple PRBs. In this case, the information on the common resource set may indicate the number of slots and / or the number of PRBs over which the CSI-RS resource configuration is repeated. In this way, by using repeated CSI-RS resource configuration, it is possible to improve measurement accuracy while reducing configuration overhead.

[0034] Furthermore, the common resource set is arranged according to a periodicity and a time offset, and the periodicity and the time offset are commonly configured for the CSI-RSs in the common resource set, thereby reducing the configuration overhead compared to configuring them for each CSI-RS.

[0035] The CSI-RS resource configuration indicates CSI-RS resources in units of a predetermined time length and a predetermined bandwidth. For example, as shown in Fig. 2, the CSI-RS resource configuration indicates multiple CSI-RS resources in units of one slot and one PRB. Each CSI-RS resource may include information on time / frequency resources and antenna ports.

[0036] In this example, the CSI-RS resource configuration includes information on 36 time / frequency resources and two antenna ports. In this example, each CSI-RS time / frequency resource is composed of two symbols and one subcarrier. In each time / frequency resource, two CSI-RSs transmitted using two antenna ports are code division multiplexed using an orthogonal code (e.g., OCC (Orthogonal Cover Code)) spanning two symbols (sequence length 2).

[0037] The CSI-RS resource configuration may include the time domain location and frequency domain location of each CSI-RS time / frequency resource. The time domain location and frequency domain location may be represented by a symbol index and a subcarrier index, respectively. The CSI-RS resource configuration may include a CSI-RS configuration index (#0-#35) for identifying the time / frequency resource of each CSI-RS.

[0038] The CSI-RS resource configuration may include an antenna port index (X, X+1) to identify the antenna port for each CSI-RS.

[0039] In addition to the common resource configuration information, resource configuration information for each beam may be configured in the UE. For example, the resource configuration information may include at least one of information indicating a combination of indexes of resources in the common resource set and their identifiers (CSI-RS-IDs), a scrambling ID, and an antenna port index.

[0040] The common resource configuration information may be common to a frequency band (e.g., carrier) unit, a cell unit, or a beam / TRP group unit. A beam / TRP group may be a group of some beams and / or TRPs in a cell, or a group of multiple beams and / or TRPs across cells.

[0041] The UE reports the top N measurement results (e.g., RSRP) of the detected CSI-RS resources and information associated with those CSI-RS resources (e.g., at least one of the CSI-RS resource configuration index, cell ID (scrambling ID), and antenna port index).

[0042] In this way, by sharing some of the information required for CSI-RS-based RRM measurements across multiple UEs, the amount of information required for configuration can be reduced.

[0043] However, details of signaling of common resource configuration information (common signaling, for example, SIB (System Information Block)) have not been determined, and common signaling for serving cells and neighboring cells has not been determined.

[0044] Therefore, the inventors came up with the idea that a network (e.g., a radio base station) transmits an SIB indicating common resource configuration information common to multiple CSI-RS beams used to transmit CSI-RS, and that a UE controls measurement of the CSI-RS transmitted using one of the multiple CSI-RS beams based on the SIB.

[0045] Multiple CSI-RS beams may be switched (swept). The multiple CSI-RS beams are associated with multiple CSI-RS configurations, respectively. The CSI-RS of each CSI-RS configuration is transmitted using the corresponding CSI-RS beam.

[0046] Specifically, common signaling for reporting common resource configuration information is defined. The following options are considered for the serving cell and neighboring cells:

[0047] Option A: For the serving cell and neighboring cells, separate common signaling (eg, different SIBs) is used to convey the CSI-RS configuration.

[0048] Option B: One common signaling (eg, one SIB) is used to convey the CSI-RS configuration to the serving cell and neighboring cells.

[0049] Option C: One common signaling (e.g., one SIB) is used to convey the CSI-RS configuration for the serving cell, and the CSI-RS configuration for neighboring cells is notified using UE-dedicated RRC signaling.

[0050] Instead of the SIB, UE-common higher layer signaling such as other broadcast information may be used, and instead of the RRC signaling, other UE-specific higher layer signaling may be used.

[0051] Additionally, the following options are considered for common signaling in a multi-beam scenario:

[0052] Option 1: UE common signaling: For example, the contents of the SIB on different transmission beams during beam sweeping are common. The SIB conveys the CSI-RS configuration and the association between each CSI-RS configuration and SS block (index). Note that Option 1 corresponds to Options A-1, A-1a, A-3, and A-3a described below.

[0053] An SS block is a resource (or resource set) that includes at least one of NR-PSS, NR-SSS, and PBCH. For example, a UE may assume that the NR-PSS, NR-SSS, and PBCH received in an SS block corresponding to the same SS block index (time index corresponding to the SS block) are transmitted in the same transmit beam. The UE can detect the SS block index from the signal in the SS block.

[0054] The SS block is transmitted using a corresponding transmit beam. The SIB is transmitted using each of multiple transmit beams. The width of the transmit beam may be wider than the width of the CSI-RS beam. For example, the area covered by a transmit beam may overlap with the areas covered by multiple CSI-RS beams. The transmit beam may be referred to as a synchronization spatial resource.

[0055] Option 2: UE group common (beam-specific) signaling: For example, the content of the SIB on different transmission beams during beam sweeping is different. The SIB conveys the CSI-RS configuration associated with the transmission beam used for the SIB transmission. Note that Option 2 corresponds to Options A-2 and A-4 described below.

[0056] In this way, by transmitting an SIB indicating common resource configuration information common to multiple CSI-RS beams used for CSI-RS transmission, the signaling overhead of the CSI-RS configuration can be reduced. Also, by controlling measurement of the CSI-RS transmitted using one of the multiple CSI-RS beams based on the SIB, the UE can measure the appropriate CSI-RS, thereby reducing the load on the UE.

[0057] Note that "beam" may be interpreted as "resource," "spatial resource," "antenna port," or the like.

[0058] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Wireless communication methods according to the respective embodiments may be applied independently or in combination.

[0059] (Wireless communication method) First Embodiment In a first embodiment of the present invention, separate common signaling (eg, different SIBs) is used to convey the CSI-RS configuration to the serving cell and neighboring cells (Option A).

[0060] Common signaling for serving cell CSI-RS configuration For common signaling (e.g., SIB) for CSI-RS configuration of the serving cell, the following options A-1, A-1a, and A-2 are considered.

[0061] Option A-1: ​​Each SIB on a different transmission beam carries all CSI-RS configurations for the serving cell and the association between each CSI-RS configuration and an SS block (index). That is, the content of the SIBs transmitted using all transmission beams in the serving cell is common. The UE can obtain all CSI-RS configurations for the serving cell by reading one SIB. The UE then selects the CSI-RS associated with the detected SS block index and measures the selected CSI-RS.

[0062] According to Option A-1, a UE can select a CSI-RS configuration that it may receive from one SIB, thereby avoiding the need to notify each UE of the CSI-RS configuration individually and reducing the overhead of notifying the CSI-RS configuration.

[0063] Option A-1a: Each SIB on a different transmit beam carries multiple CSI-RS configurations for the serving cell and an association between each CSI-RS configuration and an SS block (index). Here, multiple CSI-RS configurations are associated with a certain unit (e.g., an SS burst). By reading one SIB, the UE can obtain the corresponding CSI-RS configuration for the SS burst of the serving cell. The UE then selects the CSI-RS associated with the SS block index detected in the SS burst and measures the selected CSI-RS.

[0064] According to Option A-1a, the amount of information in the SIB can be reduced compared to Option A-1 by transmitting CSI-RS configurations associated with groups of transmission beams (SS bursts).

[0065] An SS burst is a unit of time resource that includes multiple SS blocks, and may be a slot or a subframe. One SS block is associated with one transmission beam, and one SS burst is associated with a set of multiple transmission beams. Therefore, the contents of the SIB within each set are common. When a UE moves from a position within one set to a position within another set, it rereads the SIB.

[0066] Option A-2: Each SIB on a different transmit beam carries a corresponding CSI-RS configuration for the serving cell. That is, the content of the SIB is different for each corresponding transmit beam. The UE can obtain the corresponding CSI-RS configuration for the serving cell by reading one SIB. The UE may also read multiple SIBs to obtain more CSI-RS configurations (associated with different transmit beams for SS blocks and / or SIBs).

[0067] According to option A-2, by transmitting the CSI-RS configuration of the CSI-RS beam associated with the transmission beam, the amount of information in the SIB can be reduced compared to options A-1 and A-1a.

[0068] The UE may also be triggered to read multiple SIBs based on configured events (e.g., A2-A6) or individual signaling (based on UE measurement reports), allowing the NW to control when to configure the contents of the SIBs to the UE.

[0069] Next, a specific example of RRM measurement of a serving cell will be described.

[0070] FIG. 3A illustrates an example of a scenario for CSI-RS measurement in a serving cell. Within a serving cell, wide transmit beams (#0, #1, #2, #3) are swept for transmitting SS blocks and SIBs. In this example, there are four transmit beams. Narrower CSI-RS beams (#0a, #0b, #0c, ..., #3a, #3b, #3c) are swept for transmitting CSI-RS. In this example, there are twelve CSI-RS beams. Each transmit beam (e.g., #0) is associated with three CSI-RS beams (e.g., #0a, #0b, #0c). For example, a CSI-RS beam receivable in a certain area is associated with a transmit beam receivable in that area. In this example, the area capable of receiving any of CSI-RS beams #0a, #0b, and #0c overlaps with the area capable of receiving transmit beam #0.

[0071] 3B shows an example of the contents of the SIB in Option A-1. In Option A-1, the same SIB is transmitted for all transmit beams. This SIB includes the CSI-RS configuration that uses each CSI-RS beam and the index of the SS block that uses the transmit beam associated with that CSI-RS beam.

[0072] 3C is a diagram showing an example of the contents of the SIB in Option A-2. In Option A-2, different SIBs are transmitted in different transmit beams. Each SIB contains a CSI-RS configuration using the corresponding CSI-RS beam.

[0073] In option A-1a, multiple SS blocks within an SS burst are transmitted using multiple transmit beams, respectively.

[0074] 4A is a diagram showing an example of an SS burst. The SS burst in this diagram is one slot, i.e., one slot includes multiple SS blocks.

[0075] FIG. 4B is a diagram showing another example of an SS burst. The SS burst in this diagram is one subframe containing multiple slots. In other words, one subframe contains multiple SS blocks. This diagram shows an example in which the first slot of a subframe contains multiple SS blocks, and the other slots do not contain any SS blocks. It is difficult to transmit data through slots containing multiple SS blocks because beam sweeping is performed. Data transmission efficiency can be improved by transmitting data in slots that do not contain any SS blocks. Note that multiple SS blocks may be arranged across multiple slots within one subframe.

[0076] 4C shows the contents of the SIBs in Option A-1a. Here, SS burst X includes SS blocks using transmit beam #0 and SS blocks using transmit beam #1. SS burst Y includes SS blocks using transmit beam #2 and SS blocks using transmit beam #3. The SIBs using transmit beams #0 and #1 corresponding to SS burst X include CSI-RS configurations using the CSI-RS beams associated with transmit beams #0 and #1 and indices of SS blocks using the transmit beams associated with those CSI-RS beams. The SIBs using transmit beams #2 and #3 corresponding to SS burst Y include CSI-RS configurations using the CSI-RS beams associated with transmit beams #2 and #3 and indices of SS blocks using the transmit beams associated with those CSI-RS beams.

[0077] According to the above common signaling for the CSI-RS configuration of the serving cell, a UE receives an SS block transmitted using one of a plurality of transmission beams associated with a plurality of CSI-RS beams, an SIB including common resource configuration information is transmitted using at least one of the plurality of transmission beams, and the UE controls measurement of the CSI-RS transmitted using the CSI-RS beam associated with the transmission beam corresponding to the received SS block, thereby enabling the UE to select and measure the CSI-RS receivable at the UE's location from the common resource configuration.

[0078] Common signaling for CSI-RS configuration in neighboring cells Regarding common signaling (e.g., SIB) for CSI-RS configuration of neighboring cells, the following options A-3, A-3a, and A-4 are considered.

[0079] Option A-3: Each SIB on a different transmission beam of the serving cell conveys all CSI-RS configurations for neighboring cells and the association between each CSI-RS configuration and the SS block (index) of the neighboring cell. The contents of all SIBs using transmission beams in the serving cell are common. For example, a CSI-RS configuration using a CSI-RS beam of a neighboring cell that can be received in a certain area is associated with an SS block using a transmission beam of the neighboring cell that can be received in that area.

[0080] This allows the UE to receive all CSI-RS configurations from neighboring cells and select a CSI-RS configuration that it can receive, thereby avoiding the need to notify each UE of the CSI-RS configuration individually and reducing the overhead of notifying the CSI-RS configuration.

[0081] Instead of the SS block index of the neighboring cell, the SS block index of the serving cell corresponding to the transmission beam used for the SIB may be used. For example, a CSI-RS configuration using a CSI-RS beam of a neighboring cell that can be received in a certain area is associated with an SS block that uses a transmission beam of a serving cell that can be received in that area.

[0082] Furthermore, the cell ID of a neighboring cell may be associated with a CSI-RS configuration that uses the CSI-RS beam of the neighboring cell.

[0083] A UE can obtain all CSI-RS configurations for neighboring cells by reading one SIB. The UE then selects the CSI-RS associated with the detected SS block index and measures the selected CSI-RS. Option A-3 allows the UE to select the CSI-RS configurations it may receive from one SIB. This avoids reporting the CSI-RS configurations to each UE individually, reducing the overhead of reporting the CSI-RS configurations.

[0084] Option A-3a: Each SIB on a different transmission beam conveys multiple CSI-RS configurations for neighboring cells and an association between each CSI-RS configuration and the SS block (index) of the neighboring cell. The contents of different SIBs within a certain unit (e.g., SS burst) are common. Instead of the SS block index of the neighboring cell, the SS block index of the serving cell corresponding to the transmission beam used for the SIB may be used. Also, the cell ID of the neighboring cell may be associated with the CSI-RS configuration using the CSI-RS beam of the neighboring cell.

[0085] The UE can obtain the corresponding CSI-RS configuration for the SS burst of a neighboring cell by reading one SIB, and then selects the CSI-RS associated with the SS block index detected in the SS burst and measures the selected CSI-RS.

[0086] According to Option A-3a, by transmitting CSI-RS configurations associated with groups of transmission beams (SS bursts), the amount of information in one SIB can be reduced compared to Option A-3.

[0087] Option A-4: Each SIB on a different transmission beam carries a corresponding CSI-RS configuration for a neighboring cell. Instead of the SS block index of the neighboring cell, the SS block index of the serving cell corresponding to the transmission beam used for the SIB may be used. Also, the cell ID of the neighboring cell may be associated with the CSI-RS configuration using the CSI-RS beam of the neighboring cell.

[0088] A UE can obtain corresponding CSI-RS configurations for neighboring cells by reading one SIB, and may also read multiple SIBs to obtain more CSI-RS configurations.

[0089] According to option A-4, by transmitting the CSI-RS configuration of the CSI-RS beam associated with the transmission beam, the amount of information in the SIB can be reduced compared to options A-3 and A-3a.

[0090] Next, a specific example of RRM measurement of a neighboring cell will be described.

[0091] FIG. 5A is a diagram showing an example of a scenario for measuring CSI-RS in neighboring cells. As in FIG. 3A, transmit beams #0, #1, #2, and #3 are transmitted within the serving cell, and CSI-RS beams #0a, #0b, #0c, ..., #3a, #3b, and #3c are transmitted. There are also neighboring cells, X, Y, and Z. Cell X sweeps transmit beams X0, X1, X2, ..., and CSI-RS beams X0a, X0b, X0c, .... Cell Y sweeps transmit beams Y0, Y1, Y2, ..., and CSI-RS beams Y0a, Y0b, Y0c, .... Cell Z sweeps transmit beams Z0, Z1, Z2, ..., and CSI-RS beams Z0a, Z0b, Z0c, ....

[0092] 5B is a diagram showing an example of the contents of the SIB in Option A-3. In Option A-3, the same SIB is transmitted for all transmission beams #0-#3. This SIB includes the CSI-RS configurations using each CSI-RS beam of a neighboring cell, the cell IDs of the neighboring cells, and the indexes of the SS blocks in the neighboring cells that use the transmission beams associated with the CSI-RS beams.

[0093] 5C is a diagram showing an example of the contents of the SIB in Option A-4. In Option A-4, different SIBs are transmitted using different transmit beams. Each SIB includes a CSI-RS configuration using a corresponding CSI-RS beam in a neighboring cell, the cell ID of the neighboring cell, and the index of an SS block in the neighboring cell that uses the transmit beam associated with the CSI-RS beam.

[0094] In Option A-3a, the content of the SIB using a transmit beam corresponding to one SS burst of the serving cell for the CSI-RS configuration of a neighboring cell is common. For example, if two SS blocks in an SS burst are transmitted using transmit beams #0 and #1, respectively, the content of the SIB for the CSI-RS configuration of the neighboring cell is common to transmit beams #0 and #1. Even if the number of transmit beams and CSI-RS beams and the sweeping patterns of those beams in the neighboring cell are different from those of the serving cell, the SIB transmitted using transmit beams #0 and #1 can convey the CSI-RS configuration of the neighboring cell being measured and its associated cell ID and SS block index.

[0095] The CSI-RS configuration of a neighboring cell may be mapped to the SIB of the serving cell so that the CSI-RS configuration of the neighboring cell conveyed by the SIB can be observed by UEs within the area of ​​the SIB. This mapping method is also applicable to Options A-3 and A-4.

[0096] In Options A-3, A-3a, and A-4, the SS block index of the serving cell may be associated with the CSI-RS configuration for the neighboring cell instead of the cell ID and SS block index of the neighboring cell. In this case, the UE does not need to read the SS block index from the transmission beam of the neighboring cell. Furthermore, the UE can measure the CSI-RS of the appropriate CSI-RS beam in an area where it can receive the transmission beam.

[0097] That is, in option A-3, each SIB may indicate the association between the CSI-RS configuration of a neighboring cell and the SS block index of the serving cell.

[0098] In addition, in option A-3a, an SIB transmitted using a transmission beam associated with a certain SS burst of a serving cell may indicate an association between a CSI-RS configuration associated with that transmission beam in a neighboring cell and an SS block index transmitted using that transmission beam in the serving cell.

[0099] FIG. 6 is a diagram showing another example of the contents of the SIB of Option A-4. In Option A-4, the SIB transmitted using a certain transmission beam of the serving cell may indicate the CSI-RS configuration associated with that transmission beam among the CSI-RS configurations of neighboring cells. In this case, the SIB does not need to include the SS block index of the serving cell. For example, the SIB transmitted using transmission beam #0 of the serving cell includes the CSI-RS configuration of the CSI-RS beam of neighboring cell X associated with that transmission beam. Furthermore, the SIB transmitted using transmission beam #1 of the serving cell includes the CSI-RS configuration of the CSI-RS beam of neighboring cells X and Y associated with that transmission beam. According to this Option A-4, the amount of information in the SIB can be reduced compared to Options A-3 and A-3a.

[0100] <Second embodiment> In a second embodiment of the present invention, one common signaling (eg, one SIB) is used to convey the CSI-RS configuration to the serving cell and neighboring cells (Option B).

[0101] Regarding common signaling (e.g., SIB) for CSI-RS configuration of the serving cell and neighboring cells, the following options B-1, B-2, B-3, and B-4 are considered.

[0102] The SIB of Option B-1 uses Option A-1 for the CSI-RS configuration of the serving cell and Option A-3 for the CSI-RS configuration of the neighboring cells. The contents of the different SIBs are common.

[0103] The SIB of Option B-2 uses Option A-1 for the CSI-RS configuration of the serving cell and Option A-4 for the CSI-RS configuration of neighboring cells. The content for the CSI-RS configuration of the serving cell is common to different SIBs. The content for the CSI-RS configuration of neighboring cells is different in different SIBs.

[0104] The SIB of Option B-3 uses Option A-2 for the CSI-RS configuration of the serving cell and Option A-3 for the CSI-RS configuration of neighboring cells. The content for the CSI-RS configuration of the serving cell differs in different SIBs. The content for the CSI-RS configuration of neighboring cells is common to the different SIBs.

[0105] The SIB of option B-4 uses option A-2 for the CSI-RS configuration of the serving cell and option A-4 for the CSI-RS configuration of the neighboring cells. The contents of the different SIBs are different.

[0106] In addition, in Options B-1, B-2, B-3, and B-4, Option A-1a may be used for CSI-RS configuration of the serving cell, and Option A-3a may be used for CSI-RS configuration of surrounding cells.

[0107] According to the second embodiment described above, one SIB includes common resource configuration information of the serving cell and common resource information of neighboring cells, thereby avoiding notifying the CSI-RS configuration to each UE individually, thereby reducing the overhead of notifying the CSI-RS configuration.

[0108] <Third embodiment> In a third embodiment of the present invention, one common signaling (e.g., one SIB) is used to convey the CSI-RS configuration for the serving cell, and the CSI-RS configuration for neighboring cells is notified by UE-specific RRC signaling (Option C).

[0109] Regarding common signaling (e.g., SIB) for CSI-RS configuration of the serving cell and neighboring cells, the following options C-1 and C-2 are considered.

[0110] Option C-1 uses the common signaling of Option A-1 for CSI-RS configuration of the serving cell and uses dedicated RRC signaling for CSI-RS configuration of neighboring cells.

[0111] Option C-2 uses the common signaling of Option A-2 for CSI-RS configuration of the serving cell and uses dedicated RRC signaling for CSI-RS configuration of neighboring cells.

[0112] In options C-1 and C-2, dedicated RRC signaling for CSI-RS configuration of neighboring cells may be determined based on UE measurement reports (e.g., detected SS blocks of neighboring cells).

[0113] FIG. 7 shows an example of a scenario for Option C-2. In this example, UEs #0, #1, and #2 are located within the area of ​​transmission beam #1 of the serving cell. UE #0 is located near the boundary between the serving cell and cells X and Y, and therefore reports measurement results for cells X and Y. As a result, UE #0 is configured with the CSI-RS configurations of cells X and Y as neighboring cells using dedicated RRC signaling. UE #1 is located near the center of the serving cell, and therefore does not report measurement results for neighboring cells. As a result, UE #1 is not configured with the CSI-RS configurations of neighboring cells. UE #2 is located near the boundary between the serving cell and cell Y, and therefore reports measurement results for cell Y. As a result, UE #0 is configured with the CSI-RS configuration of cell Y as a neighboring cell using dedicated RRC signaling.

[0114] According to the third embodiment described above, by using common signaling for the CSI-RS configuration of the serving cell, it is possible to reduce the overhead of notifying the CSI-RS configuration. Because the possibility of receiving the CSI-RS beam of a neighboring cell varies depending on the UE's position within the serving cell, the CSI-RS configuration of the neighboring cell can be notified to each UE individually. Furthermore, by determining the CSI-RS configuration based on the UE's measurement report, it is possible to notify the appropriate CSI-RS configuration of the neighboring cell.

[0115] <Example of change> In all the above options, based on the common CSI-RS RRM measurement configuration in the SIB, UE-specific RRC signaling may update some parameters for the CSI-RS resource configuration or restrict the CSI-RS to be measured for the serving cell and / or neighboring cells.

[0116] For options A-2 and A-4 (option 2), UE group-wide (beam-specific) SIB transmission containing CSI-RS configuration for the serving cell and / or neighboring cells may be requested by the UE, i.e., on-demand.

[0117] Which option is applied may be defined in the specifications for each frequency range or frequency band, or may be signaled by the NW.

[0118] The association of the CSI-RS configuration with the SS block and / or the cell ID of the neighboring cell may be information about Quasi-Co-Location (QCL).

[0119] Note that the SIB does not need to include a CSI-RS configuration. The SIB may be replaced with another broadcast channel (e.g., including RMSI (Remaining Minimum System Information)) or a specific channel such as NR-PDSCH that transmits the SIB. That is, the content of the specific channel transmitted using different transmission beams may be the same, or the content of the specific channel transmitted using different transmission beams may be different. Furthermore, when the UE receives an SS block transmitted using a different transmission beam (or a set of transmission beams) depending on its movement, the UE may re-read the content of the specific channel transmitted using the transmission beam.

[0120] (wireless communication system) The configuration of a wireless communication system according to one embodiment of the present invention will be described below. In this wireless communication system, communication is performed using any one of the wireless communication methods according to the above embodiments of the present invention or a combination of these methods.

[0121] 8 is a diagram showing an example of a schematic configuration 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, which aggregates multiple basic frequency blocks (component carriers) with the system bandwidth (e.g., 20 MHz) of the LTE system as one unit.

[0122] The wireless communication system 1 may be referred to as LTE (Long Term Evolution), LTE-A (LTE-Advanced), LTE-B (LTE-Beyond), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system), NR (New Radio), FRA (Future Radio Access), New-RAT (Radio Access Technology), etc., or may be referred to as a system that realizes these.

[0123] The wireless communication system 1 includes a wireless base station 11 that forms a macrocell C1 with a relatively wide coverage, and wireless base stations 12 (12a-12c) that are arranged within the macrocell C1 and form small cells C2 that are smaller than the macrocell C1. User terminals 20 are also arranged in the macrocell C1 and each small cell C2. The arrangement and number of each cell and user terminal 20 are not limited to those shown in the figure.

[0124] The user terminal 20 can be connected to both the radio base station 11 and the radio base station 12. It is assumed that the user terminal 20 uses the macro cell C1 and the small cell C2 simultaneously by CA or DC. Furthermore, the user terminal 20 may apply CA or DC using multiple cells (CCs) (for example, five or fewer CCs, six or more CCs).

[0125] Communication between the user terminal 20 and the radio base station 11 can be performed using a carrier (also called an existing carrier or legacy carrier) with a relatively low frequency band (for example, 2 GHz) and a narrow bandwidth. On the other hand, communication between the user terminal 20 and the radio base station 12 can use a carrier with a relatively high frequency band (for example, 3.5 GHz, 5 GHz, etc.) and a wide bandwidth, or the same carrier as between the user terminal 20 and the radio base station 11 can be used. Note that the configuration of the frequency bands used by each radio base station is not limited to this.

[0126] The connection between the radio base station 11 and the radio base station 12 (or between two radio base stations 12) can be configured as a wired connection (for example, optical fiber conforming to CPRI (Common Public Radio Interface), X2 interface, etc.) or a wireless connection.

[0127] The radio base station 11 and each radio base station 12 are each connected to a higher station device 30, and are connected to a core network 40 via the higher station device 30. The higher 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 to these. Furthermore, each radio base station 12 may be connected to the higher station device 30 via the radio base station 11.

[0128] The radio base station 11 is a radio base station having a relatively wide coverage area, and may be called a macro base station, an aggregation node, an eNodeB (eNB), a transmission / reception point, etc. The radio base station 12 is a radio base station having a local coverage area, and may be called a small base station, a micro base station, a pico base station, a femto base station, a Home eNodeB (HeNB), a Remote Radio Head (RRH), a transmission / reception point, etc. Hereinafter, when there is no need to distinguish between the radio base stations 11 and 12, they will be collectively referred to as the radio base station 10.

[0129] Each user terminal 20 is a terminal compatible with various communication methods such as LTE and LTE-A, and may include not only a mobile communication terminal (mobile station) but also a fixed communication terminal (fixed station).

[0130] In the wireless communication system 1, as a wireless access scheme, Orthogonal Frequency Division Multiple Access (OFDMA) is applied to the downlink, and Single Carrier Frequency Division Multiple Access (SC-FDMA) and / or OFDMA is applied to the uplink.

[0131] OFDMA is a multi-carrier transmission method that divides a 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 one or consecutive resource block bands for each terminal, and multiple terminals use different bands to reduce interference between terminals. Note that the uplink and downlink radio access methods are not limited to the combination of these, and other radio access methods may also be used.

[0132] In the wireless communication system 1, downlink channels used include a downlink shared channel (PDSCH: Physical Downlink Shared Channel) shared by each user terminal 20, a broadcast channel (PBCH: Physical Broadcast Channel), a downlink L1 / L2 control channel, etc. User data, upper layer control information, SIBs (System Information Blocks), etc. are transmitted via the PDSCH. Furthermore, a MIB (Master Information Block) is transmitted via the PBCH.

[0133] The downlink L1 / L2 control channels include a PDCCH (Physical Downlink Control Channel), an EPDCCH (Enhanced Physical Downlink Control Channel), a PCFICH (Physical Control Format Indicator Channel), a PHICH (Physical Hybrid-ARQ Indicator Channel), etc. Downlink control information (DCI) including scheduling information for the PDSCH and / or PUSCH is transmitted by the PDCCH.

[0134] Note that scheduling information may be transmitted by DCI. For example, DCI for scheduling DL data reception may be called DL assignment, and DCI for scheduling UL data transmission may be called UL grant.

[0135] The PCFICH transmits the number of OFDM symbols used for the PDCCH. The PHICH transmits acknowledgement information (e.g., retransmission control information, also referred to as HARQ-ACK or ACK / NACK) of HARQ for the PUSCH. The EPDCCH is frequency-division multiplexed with the PDSCH (downlink shared data channel) and is used to transmit DCI and the like, similar to the PDCCH.

[0136] In the wireless communication system 1, uplink channels used include an uplink shared channel (PUSCH: Physical Uplink Shared Channel) shared by each user terminal 20, an uplink control channel (PUCCH: Physical Uplink Control Channel), and a random access channel (PRACH: Physical Random Access Channel). The PUSCH transmits user data, upper layer control information, and the like. The PUCCH transmits downlink radio quality information (CQI: Channel Quality Indicator), delivery acknowledgement information, scheduling requests (SR), and the like. The PRACH transmits a random access preamble for establishing a connection with a cell.

[0137] In the wireless communication system 1, a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS), a demodulation reference signal (DMRS), a positioning reference signal (PRS), etc. are transmitted as downlink reference signals. In addition, in the wireless communication system 1, a sounding reference signal (SRS), a demodulation reference signal (DMRS), etc. are transmitted as uplink reference signals. Note that the DMRS may be called a user equipment-specific reference signal (UE-specific reference signal). In addition, the reference signals to be transmitted are not limited to these.

[0138] (wireless base station) 9 is a diagram showing an example of the overall configuration of a radio base station according to one embodiment of the present invention. The radio base station 10 includes a plurality of transmitting / receiving antennas 101, an amplifier unit 102, a transmitting / receiving unit 103, a baseband signal processing unit 104, a call processing unit 105, and a transmission path interface 106. Note that the radio base station 10 may be configured to include one or more of each of the transmitting / receiving antennas 101, the amplifier unit 102, and the transmitting / receiving unit 103.

[0139] User data transmitted from the radio base station 10 to the user terminal 20 via a downlink is input from the higher-level station device 30 to the baseband signal processing unit 104 via a transmission path interface 106 .

[0140] The baseband signal processing unit 104 performs transmission processing such as PDCP (Packet Data Convergence Protocol) layer processing, user data division and concatenation, RLC (Radio Link Control) layer transmission processing such as RLC retransmission control, MAC (Medium Access Control) retransmission control (e.g., HARQ transmission processing), scheduling, transmission format selection, channel coding, inverse fast Fourier transform (IFFT) processing, and precoding processing on the user data, and then transfers the data to the transceiver unit 103. In addition, the downlink control signal also undergoes transmission processing such as channel coding and inverse fast Fourier transform, and then transfers the data to the transceiver unit 103.

[0141] The transceiver 103 converts the baseband signal output from the baseband signal processor 104 after precoding for each antenna into a radio frequency band and transmits the converted signal. The radio frequency signal frequency-converted by the transceiver 103 is amplified by the amplifier 102 and transmitted from the transceiver antenna 101. The transceiver 103 may be configured as a transmitter / receiver, a transceiver circuit, or a transceiver device, which are explained based on common understanding in the technical field related to the present invention. Note that the transceiver 103 may be configured as an integrated transceiver, or may be configured as a transmitter and a receiver.

[0142] On the other hand, for uplink signals, radio frequency signals received by the transmitting / receiving antenna 101 are amplified by the amplifier unit 102. The transmitting / receiving unit 103 receives the uplink signals amplified by the amplifier unit 102. The transmitting / receiving unit 103 frequency-converts the received signals to baseband signals and outputs them to the baseband signal processing unit 104.

[0143] The baseband signal processing unit 104 performs Fast Fourier Transform (FFT), Inverse Discrete Fourier Transform (IDFT), error correction decoding, MAC retransmission control reception processing, and RLC layer and PDCP layer reception processing on the user data included in the input uplink signal, and transfers the result to the higher-level station device 30 via the transmission path interface 106. The call processing unit 105 performs call processing (setting up, releasing, etc.) of communication channels, status management of the radio base station 10, management of radio resources, etc.

[0144] The transmission line interface 106 transmits and receives signals to and from the higher-level station device 30 via a predetermined interface. The transmission line interface 106 may also transmit and receive signals (backhaul signaling) to and from other radio base stations 10 via an inter-base station interface (for example, an optical fiber compliant with CPRI (Common Public Radio Interface) or an X2 interface).

[0145] In addition, the transceiver 103 may transmit common information (e.g., SIB) indicating parameters (e.g., common resource configuration information) common to multiple spatial resources (e.g., CSI-RS beams) used to transmit reference signals (e.g., CSI-RS).

[0146] Furthermore, the transceiver 103 may transmit a synchronization signal (e.g., an SS block) that is transmitted using a synchronization spatial resource (e.g., a transmission beam) associated with multiple spatial resources (e.g., CSI-RS beams).

[0147] 10 is a diagram showing an example of the functional configuration of a wireless base station according to an embodiment of the present invention. Note that this example mainly shows functional blocks characteristic of this embodiment, and the wireless base station 10 also has other functional blocks necessary for wireless communication.

[0148] 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 measurement unit 305. Note that these components only need to be included in the radio base station 10, and some or all of the components do not necessarily need to be included in the baseband signal processing unit 104.

[0149] The control unit (scheduler) 301 performs overall control of the radio base station 10. The control unit 301 can be configured from a controller, a control circuit, or a control device that is explained based on common understanding in the technical field related to the present invention.

[0150] The control unit 301 controls, for example, signal generation by the transmission signal generation unit 302 and signal allocation by the mapping unit 303. The control unit 301 also controls signal reception processing by the reception signal processing unit 304 and signal measurement by the measurement unit 305.

[0151] The control unit 301 controls scheduling (e.g., resource allocation) of system information, downlink data signals (e.g., signals transmitted on PDSCH), and downlink control signals (e.g., signals transmitted on PDCCH and / or EPDCCH, such as acknowledgement information). The control unit 301 also controls generation of downlink control signals, downlink data signals, etc., based on the result of determining whether retransmission control is required for uplink data signals. The control unit 301 also controls scheduling of synchronization signals (e.g., PSS (Primary Synchronization Signal) / SSS (Secondary Synchronization Signal)), downlink reference signals (e.g., CRS, CSI-RS, DMRS), etc.

[0152] The control unit 301 controls the scheduling of uplink data signals (e.g., signals transmitted on PUSCH), uplink control signals (e.g., signals transmitted on PUCCH and / or PUSCH, such as delivery acknowledgement information), random access preambles (e.g., signals transmitted on PRACH), uplink reference signals, etc.

[0153] The transmission signal generating unit 302 generates downlink signals (downlink control signals, downlink data signals, downlink reference signals, etc.) based on instructions from the control unit 301, and outputs the signals to the mapping unit 303. The transmission signal generating unit 302 can be configured from a signal generator, a signal generating circuit, or a signal generating device that is explained based on common understanding in the technical field related to the present invention.

[0154] The transmission signal generation unit 302 generates a DL assignment that notifies allocation information of downlink data and / or a UL grant that notifies allocation information of uplink data, for example, based on an instruction from the control unit 301. Both the DL assignment and the UL grant are DCI and comply with the DCI format. Furthermore, the downlink data signal is coded and modulated in accordance with a coding rate, modulation scheme, etc. determined based on channel state information (CSI) from each user terminal 20, etc.

[0155] Based on instructions from the control unit 301, the mapping unit 303 maps the downlink signal generated by the transmission signal generation unit 302 to a predetermined radio resource and outputs the result to the transceiver unit 103. The mapping unit 303 can be configured from a mapper, a mapping circuit, or a mapping device that is described based on common understanding in the technical field related to the present invention.

[0156] The received signal processing unit 304 performs reception processing (e.g., demapping, demodulation, decoding, etc.) on the received signal input from the transceiver unit 103. Here, the received signal is, for example, an uplink signal (e.g., an uplink control signal, an uplink data signal, an uplink reference signal, etc.) transmitted from the user terminal 20. The received signal processing unit 304 can be configured from a signal processor, a signal processing circuit, or a signal processing device that is explained based on common understanding in the technical field related to the present invention.

[0157] The received signal processing unit 304 outputs information decoded by the receiving processing to the control unit 301. For example, when a PUCCH including an HARQ-ACK is received, the HARQ-ACK is output to the control unit 301. The received signal processing unit 304 also outputs the received signal and / or the signal after receiving processing to the measurement unit 305.

[0158] The measurement unit 305 performs measurements on the received signal. The measurement unit 305 can be configured with a measurement instrument, a measurement circuit, or a measurement device that is described based on common understanding in the technical field related to the present invention.

[0159] For example, the measurement unit 305 may perform RRM (Radio Resource Management) measurement, CSI (Channel State Information) measurement, etc. based on the received signal. The measurement unit 305 may measure received power (e.g., RSRP (Reference Signal Received Power)), received quality (e.g., RSRQ (Reference Signal Received Quality) or SINR (Signal to Interference plus Noise Ratio)), signal strength (e.g., RSSI (Received Signal Strength Indicator)), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 301.

[0160] Furthermore, the control unit 301 may determine dedicated signaling (for example, RRC signaling) based on measurement reports from the user terminal 20. For example, the control unit 301 may determine dedicated RRC signaling for the CSI-RS configuration of a neighboring cell based on measurement reports from the user terminal 20.

[0161] (user terminal) 11 is a diagram showing an example of the overall configuration of a user terminal according to one embodiment of the present invention. The user terminal 20 includes multiple transmitting / receiving antennas 201, an amplifier unit 202, a transmitting / receiving unit 203, a baseband signal processing unit 204, and an application unit 205. Note that the user terminal 20 may be configured to include one or more of each of the transmitting / receiving antennas 201, the amplifier unit 202, and the transmitting / receiving unit 203.

[0162] A radio frequency signal received by the transmitting / receiving antenna 201 is amplified by the amplifier unit 202. The transmitting / receiving unit 203 receives the downlink signal amplified by the amplifier unit 202. The transmitting / receiving unit 203 frequency-converts the received signal to a baseband signal and outputs the baseband signal to the baseband signal processing unit 204. The transmitting / receiving unit 203 can be configured from a transmitter / receiver, a transmitting / receiving circuit, or a transmitting / receiving device that is described based on common understanding in the technical field related to the present invention. Note that the transmitting / receiving unit 203 may be configured as an integrated transmitting / receiving unit, or may be configured from a transmitting unit and a receiving unit.

[0163] The baseband signal processing unit 204 performs FFT processing, error correction decoding, retransmission control reception processing, etc. on the input baseband signal. Downlink user data is transferred to the application unit 205. The application unit 205 performs processing related to layers higher than the physical layer and MAC layer, etc. Furthermore, broadcast information from the downlink data may also be transferred to the application unit 205.

[0164] On the other hand, uplink user data is input from the application unit 205 to the baseband signal processing unit 204. The baseband signal processing unit 204 performs transmission processing for retransmission control (for example, transmission processing for HARQ), channel coding, precoding, Discrete Fourier Transform (DFT) processing, IFFT processing, etc., and transfers the data to the transceiver unit 203. The transceiver 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 frequency-converted by the transceiver unit 203 is amplified by the amplifier unit 202 and transmitted from the transceiver antenna 201.

[0165] In addition, the transceiver 203 may receive common information (e.g., SIB) indicating parameters (e.g., common resource configuration information) common to multiple spatial resources (e.g., CSI-RS beams) used to transmit reference signals (e.g., CSI-RS).

[0166] The transceiver 203 may also receive a synchronization signal (e.g., an SS block) transmitted using a synchronization spatial resource (e.g., a transmission beam) associated with multiple spatial resources (e.g., CSI-RS beams).

[0167] Furthermore, the transceiver 203 may receive common information indicating parameters common to a plurality of spatial resources used for transmitting a reference signal of the serving cell, and may receive individual information indicating parameters of reference signals of neighboring cells.

[0168] 12 is a diagram showing an example of the functional configuration of a user terminal according to an embodiment of the present invention. Note that this example mainly shows functional blocks characteristic of this embodiment, and the user terminal 20 also has other functional blocks necessary for wireless communication.

[0169] The baseband signal processing unit 204 included in the user terminal 20 includes at least a control unit 401, a transmission signal generation unit 402, a mapping unit 403, a reception signal processing unit 404, and a measurement unit 405. Note that these components only need to be included in the user terminal 20, and some or all of the components do not necessarily need to be included in the baseband signal processing unit 204.

[0170] The control unit 401 performs overall control of the user terminal 20. The control unit 401 can be configured from a controller, a control circuit, or a control device that is explained based on common understanding in the technical field related to the present invention.

[0171] The control unit 401 controls, for example, signal generation by the transmission signal generation unit 402 and signal allocation by the mapping unit 403. The control unit 401 also controls signal reception processing by the reception signal processing unit 404 and signal measurement by the measurement unit 405.

[0172] The control unit 401 acquires the downlink control signal and downlink data signal transmitted from the radio base station 10 from the received signal processing unit 404. The control unit 401 controls the generation of the uplink control signal and / or uplink data signal based on the result of determining whether or not retransmission control is required for the downlink control signal and / or downlink data signal.

[0173] When the control unit 401 acquires various pieces of information notified by the wireless base station 10 from the received signal processing unit 404, the control unit 401 may update the parameters used for control based on the information.

[0174] The transmission signal generating unit 402 generates uplink signals (uplink control signals, uplink data signals, uplink reference signals, etc.) based on instructions from the control unit 401, and outputs them to the mapping unit 403. The transmission signal generating unit 402 can be configured from a signal generator, a signal generating circuit, or a signal generating device that is explained based on common understanding in the technical field related to the present invention.

[0175] The transmission signal generating unit 402 generates uplink control signals related to acknowledgement information, channel state information (CSI), etc., based on, for example, an instruction from the control unit 401. The transmission signal generating unit 402 also generates uplink data signals based on an instruction from the control unit 401. For example, when a downlink control signal notified from the radio base station 10 includes an UL grant, the transmission signal generating unit 402 is instructed by the control unit 401 to generate an uplink data signal.

[0176] Based on instructions from the control unit 401, the mapping unit 403 maps the uplink signal generated by the transmission signal generation unit 402 to radio resources and outputs the result to the transceiver unit 203. The mapping unit 403 can be configured from a mapper, a mapping circuit, or a mapping device that is described based on common understanding in the technical field related to the present invention.

[0177] The received signal processing unit 404 performs reception processing (e.g., demapping, demodulation, decoding, etc.) on the received signal input from the transceiver unit 203. Here, the received signal is, for example, a downlink signal (e.g., a downlink control signal, a downlink data signal, a downlink reference signal, etc.) transmitted from the radio base station 10. The received signal processing unit 404 can be configured from a signal processor, a signal processing circuit, or a signal processing device that is explained based on common understanding in the technical field related to the present invention. Furthermore, the received signal processing unit 404 can configure a receiving unit related to the present invention.

[0178] The received signal processing unit 404 outputs information decoded by the receiving 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 signal after receiving processing to the measurement unit 405.

[0179] The measurement unit 405 performs measurements on the received signal. The measurement unit 405 can be configured with a measurement instrument, a measurement circuit, or a measurement device that is described based on common understanding in the technical field related to the present invention.

[0180] For example, the measurement unit 405 may perform RRM measurement, CSI measurement, etc. based on the received signal. The measurement unit 405 may measure received power (e.g., RSRP), received quality (e.g., RSRQ, SINR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 401.

[0181] Furthermore, the control unit 401 may control measurement of a reference signal transmitted using any of a plurality of spatial resources based on the common information.

[0182] Furthermore, the common information may be transmitted using the spatial resource for synchronization. The control unit 401 may control measurement of the reference signal transmitted using the spatial resource associated with the spatial resource for synchronization based on the common information.

[0183] Furthermore, the common information may indicate associations between a plurality of synchronization spatial resources and a plurality of spatial resources, and may be transmitted using each of the plurality of synchronization spatial resources (option 1).

[0184] Alternatively, the common information may be one of a plurality of pieces of common information transmitted using a plurality of spatial resources for synchronization, each of which may indicate a parameter common to a plurality of spatial resources associated with the corresponding spatial resource for synchronization (option 2).

[0185] In addition, the common information may indicate associations between multiple groups of synchronization spatial resources (e.g., groups of transmission beams used to transmit SS bursts) and multiple spatial resources, and may be transmitted using each of the multiple groups.

[0186] Furthermore, the common information may indicate parameters common to a plurality of spatial resources used for transmitting reference signals of neighboring cells (Options A and B).

[0187] The first common information may indicate a parameter common to a plurality of spatial resources used for transmitting a reference signal of the serving cell, and the second common information may indicate a parameter common to a plurality of spatial resources used for transmitting a reference signal of the neighboring cell (Option A).The common information may also indicate a parameter common to a plurality of spatial resources used for transmitting a reference signal of the serving cell and a parameter common to a plurality of spatial resources used for transmitting a reference signal of the neighboring cell (Option B).

[0188] Alternatively, the common information may indicate parameters common to a plurality of spatial resources used for transmitting reference signals of the serving cell, and the individual information may indicate parameters of reference signals of neighboring cells (option C).

[0189] Furthermore, the common information may indicate an association between a parameter common to a plurality of spatial resources used for transmitting reference signals of neighboring cells, the cell ID of the neighboring cell, and the synchronization spatial resource of the neighboring cell (Options A-3, A-3a, A-4). Furthermore, the common information may indicate an association between a parameter common to a plurality of spatial resources used for transmitting reference signals of neighboring cells and the synchronization spatial resource of the serving cell (Options A-3, A-3a). Furthermore, the common information may indicate a parameter common to a plurality of spatial resources used for transmitting reference signals of neighboring cells, and may be one of a plurality of pieces of common information transmitted using each of a plurality of synchronization spatial resources of the serving cell (Option A-4).

[0190] (Hardware configuration) The block diagrams used to explain the above embodiments show functional blocks. These functional blocks (components) are realized by any combination of hardware and / or software. Furthermore, the method for realizing each functional block is not particularly limited. That is, each functional block may be realized using one device that is physically and / or logically coupled, or may be realized using two or more devices that are physically and / or logically separated and connected directly and / or indirectly (for example, using wires and / or wirelessly) and these multiple devices.

[0191] For example, a radio base station, a user terminal, etc. according to one embodiment of the present invention may function as a computer that performs processing of the radio communication method of the present invention. Fig. 13 is a diagram showing an example of the hardware configuration of a radio base station and a user terminal according to one embodiment of the present invention. The radio base station 10 and the user terminal 20 described above may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0192] In the following description, the term "apparatus" can be interpreted as a circuit, a device, a unit, etc. The hardware configuration of the radio base station 10 and the user terminal 20 may be configured to include one or more of the apparatuses shown in the drawings, or may be configured to exclude some of the apparatuses.

[0193] For example, although only one processor 1001 is shown, there may be multiple processors. Furthermore, the processes may be performed by one processor, or the processes may be performed by one or more processors simultaneously, serially, or in other ways. Furthermore, the processor 1001 may be implemented by one or more chips.

[0194] Each function in the radio base station 10 and the user terminal 20 is realized, for example, by loading predetermined software (programs) onto hardware such as a processor 1001 and a memory 1002, causing the processor 1001 to perform calculations, control communication via the communication device 1004, and control the reading and / or writing of data in the memory 1002 and the storage 1003.

[0195] The processor 1001 controls the entire computer by running, for example, an operating system. The processor 1001 may be configured by a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, a register, etc. For example, the above-mentioned baseband signal processing unit 104 (204), call processing unit 105, etc. may be realized by the processor 1001.

[0196] The processor 1001 also reads programs (program codes), software modules, data, etc. from the storage 1003 and / or the communication device 1004 into the memory 1002, and executes various processes in accordance with these. The programs used are those that cause a computer to execute at least some of the operations described in the above-described embodiments. For example, the control unit 401 of the user terminal 20 may be implemented by a control program stored in the memory 1002 and running on the processor 1001, and the other functional blocks may be implemented in a similar manner.

[0197] The memory 1002 is a computer-readable recording medium and may be configured, for example, by at least one of a read-only memory (ROM), an erasable programmable read-only memory (EPROM), an electrically EEPROM (EEPROM), a random access memory (RAM), or other suitable storage medium. The memory 1002 may also be referred to as a register, a cache, a main memory, or the like. The memory 1002 may store executable programs (program codes), software modules, and the like for implementing a wireless communication method according to one embodiment of the present invention.

[0198] Storage 1003 is a computer-readable recording medium and may be constituted by at least one of, for example, a flexible disk, a floppy disk, a magneto-optical disk (e.g., a compact disk (CD-ROM, etc.), a digital versatile disk, a Blu-ray disc), a removable disk, a hard disk drive, a smart card, a flash memory device (e.g., a card, stick, key drive), a magnetic stripe, a database, a server, or other suitable storage medium. Storage 1003 may also be referred to as a secondary storage device.

[0199] The communication device 1004 is hardware (transmission / reception device) for communicating between computers via a wired and / or wireless network, and is also referred to as, for example, a network device, a network controller, a network card, or a communication module. The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. to realize, for example, frequency division duplex (FDD) and / or time division duplex (TDD). For example, the above-mentioned transmission / reception antenna 101 (201), amplifier unit 102 (202), transmission / reception unit 103 (203), transmission path interface 106, etc. may be realized by the communication device 1004.

[0200] The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that receives input from the outside. The output device 1006 is an output device (for example, a display, a speaker, an LED (Light Emitting Diode) lamp, etc.) that performs output to the outside. The input device 1005 and the output device 1006 may be integrated into one device (for example, a touch panel).

[0201] Furthermore, each device, such as the processor 1001 and the memory 1002, is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using different buses between each device.

[0202] Furthermore, the radio base station 10 and the user terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), or a field programmable gate array (FPGA), and some or all of the functional blocks may be realized using the hardware. For example, the processor 1001 may be implemented using at least one of these pieces of hardware.

[0203] (Variation) Note that terms explained in this specification and / or terms necessary for understanding this specification may be replaced with terms having the same or similar meanings. For example, a channel and / or a symbol may be a signal (signaling). A signal may also be a message. A reference signal may be abbreviated as RS (Reference Signal) and may also be called a pilot, pilot signal, etc. depending on the applicable standard. A component carrier (CC) may also be called a cell, frequency carrier, carrier frequency, etc.

[0204] Furthermore, a radio frame may be composed of one or more periods (frames) in the time domain. Each of the one or more periods (frames) constituting a radio frame may be called a subframe. Furthermore, a subframe may be composed of one or more slots in the time domain. A subframe may have a fixed time length (e.g., 1 ms) that is independent of numerology.

[0205] Furthermore, a slot may be configured by one or more symbols (such as an Orthogonal Frequency Division Multiplexing (OFDM) symbol or a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol) in the time domain. Also, a slot may be a time unit based on numerology. Also, a slot may include multiple minislots. Each minislot may be configured by one or more symbols in the time domain. Also, a minislot may be called a subslot.

[0206] A radio frame, a subframe, a slot, a minislot, and a symbol all represent time units for transmitting a signal. A radio frame, a subframe, a slot, a minislot, and a symbol may each be referred to by a different name. For example, one subframe may be referred to as a transmission time interval (TTI), multiple consecutive subframes may be referred to as a TTI, or one slot or one minislot may be referred to as a TTI. In other words, a subframe and / or a TTI may be a subframe (1 ms) in the existing LTE, a period shorter than 1 ms (e.g., 1-13 symbols), or a period longer than 1 ms. The unit representing a TTI may be referred to as a slot, a minislot, or the like, instead of a subframe.

[0207] Here, TTI refers to, for example, the smallest time unit for scheduling in wireless communication. For example, in an LTE system, a wireless base station performs scheduling to allocate wireless resources (such as frequency bandwidth and transmission power that can be used by each user terminal) to each user terminal in TTI units. However, the definition of TTI is not limited to this.

[0208] The TTI may be a transmission time unit for a channel-encoded data packet (transport block), a code block, and / or a code word, or may be a processing unit for scheduling, link adaptation, etc. When a TTI is given, the time interval (e.g., the number of symbols) to which the transport block, the code block, and / or the code word are actually mapped may be shorter than the TTI.

[0209] When one slot or one minislot is called a TTI, one or more TTIs (i.e., one or more slots or one or more minislots) may be the minimum time unit for scheduling. Also, the number of slots (minislots) constituting the minimum time unit for scheduling may be controlled.

[0210] A TTI having a time length of 1 ms may be called a normal TTI (TTI in LTE Rel. 8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, a long subframe, etc. A TTI shorter than a normal TTI may be called a shortened TTI, a short TTI, a partial or fractional TTI, a shortened subframe, a short subframe, a minislot, a subslot, etc.

[0211] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length of more than 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be interpreted as a TTI having a TTI length shorter than the TTI length of a long TTI and equal to or greater than 1 ms.

[0212] A resource block (RB) is a resource allocation unit in the time domain and frequency domain, and may include one or more consecutive subcarriers in the frequency domain. Furthermore, an RB may include one or more symbols in the time domain, and may have a length of one slot, one minislot, one subframe, or one TTI. One TTI and one subframe may each be composed of one or more resource blocks. One or more RBs may also be called a physical resource block (PRB), a subcarrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, etc.

[0213] Furthermore, a resource block may be composed of one or more resource elements (REs). For example, one RE may be a radio resource region of one subcarrier and one symbol.

[0214] The above-described structures of radio frames, subframes, slots, minislots, symbols, etc. are merely examples. For example, the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the cyclic prefix (CP) length, etc. may be changed in various ways.

[0215] Furthermore, the information, parameters, etc. described in this specification may be expressed using absolute values, may be expressed using relative values ​​from a predetermined value, or may be expressed using other corresponding information. For example, a radio resource may be indicated by a predetermined index.

[0216] The names used for parameters and the like in this specification are not limiting in any way. For example, the various channels (e.g., PUCCH (Physical Uplink Control Channel), PDCCH (Physical Downlink Control Channel), etc.) and information elements may be identified by any suitable names, and therefore the various names assigned to these various channels and information elements are not limiting in any way.

[0217] The information, signals, etc. described herein may be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0218] Furthermore, information, signals, etc. may be output from a higher layer to a lower layer and / or from a lower layer to a higher layer. Information, signals, etc. may be input / output via multiple network nodes.

[0219] Input and output information, signals, etc. may be stored in a specific location (for example, memory) or may be managed using a management table. Input and output information, signals, etc. may be overwritten, updated, or added. Output information, signals, etc. may be deleted. Input information, signals, etc. may be transmitted to another device.

[0220] The notification of information is not limited to the aspects / embodiments described in this specification, and may be performed using other methods. For example, the notification of information may be performed by physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB), etc.), Medium Access Control (MAC) signaling), other signals, or a combination thereof.

[0221] The physical layer signaling may be called L1 / L2 (Layer 1 / Layer 2) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. The RRC signaling may be called an RRC message, such as an RRC connection setup message or an RRC connection reconfiguration message. The MAC signaling may be transmitted using a MAC control element (MAC CE), for example.

[0222] Furthermore, notification of specified information (e.g., notification that "it is X") is not limited to explicit notification, but may be made implicitly (e.g., by not notifying the specified information or by notifying other information).

[0223] The determination may be made by a value represented by one bit (0 or 1), by a Boolean value represented by true or false, or by a comparison of numerical values ​​(e.g., comparison with a predetermined value).

[0224] Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

[0225] Software, instructions, information, etc. may also be transmitted or received over a transmission medium. For example, if the software is transmitted from a website, server, or other remote source using wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), and / or wireless technologies (such as infrared, microwave), these wired and / or wireless technologies are included within the definition of transmission media.

[0226] As used herein, the terms "system" and "network" are used interchangeably.

[0227] In this specification, the terms "base station (BS)," "radio base station," "eNB," "gNB," "cell," "sector," "cell group," "carrier," and "component carrier" may be used interchangeably. A base station may also be called a fixed station, NodeB, eNodeB (eNB), access point, transmission point, reception point, femtocell, small cell, etc.

[0228] A base station can accommodate one or more (e.g., 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, and each smaller area can be provided with communication service by a base station subsystem (e.g., a small indoor base station (RRH: Remote Radio Head)). The term "cell" or "sector" refers to a part or the entire coverage area of ​​a base station and / or a base station subsystem that provides communication service within this coverage.

[0229] In this specification, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," and "terminal" may be used interchangeably. A base station may also be referred to by terms such as fixed station, NodeB, eNodeB (eNB), access point, transmission point, reception point, femtocell, small cell, etc.

[0230] A mobile station may also be referred to by those skilled in the art as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable terminology.

[0231] Furthermore, the radio base station in this specification may be read as a user terminal. For example, the aspects / embodiments of the present invention may be applied to a configuration in which communication between a radio base station and a user terminal is replaced with communication between multiple user terminals (Device-to-Device: D2D). In this case, the user terminal 20 may be configured to have the functions of the radio base station 10 described above. Furthermore, terms such as "uplink" and "downlink" may be read as "side." For example, an uplink channel may be read as a side channel.

[0232] Similarly, the term "user terminal" in this specification may be read as "radio base station." In this case, the radio base station 10 may be configured to have the functions of the user terminal 20 described above.

[0233] In this specification, an operation that is described as being performed by a base station may be performed by its upper node in some cases. It is clear that in a network including one or more network nodes having a base station, various operations performed for communication with a terminal may be performed by the base station, one or more network nodes other than the base station (such as, but not limited to, a Mobility Management Entity (MME) and a Serving-Gateway (S-GW)), or a combination thereof.

[0234] Each aspect / embodiment described herein may be used alone, in combination, or switched depending on the implementation. Furthermore, the processing procedures, sequences, flowcharts, etc. of each aspect / embodiment described herein may be rearranged unless inconsistent. For example, the methods described herein present elements of various steps in an exemplary order, and are not limited to the particular order presented.

[0235] Each aspect / embodiment described herein may be applied to a system using LTE (Long Term Evolution), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), 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 (Global System for Mobile communications), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, UWB (Ultra-Wideband), Bluetooth (registered trademark), or any other suitable wireless communication method, and / or a next generation system enhanced based on these.

[0236] As used herein, the phrase "based on" does not mean "based only on," unless expressly specified otherwise. In other words, the phrase "based on" means both "based only on" and "based at least on."

[0237] As used herein, any reference to an element using a designation such as "first," "second," etc. does not generally limit the quantity or order of those elements. These designations may be used herein as a convenient method of distinguishing between two or more elements. Thus, a reference to a first and a second element does not imply that only two elements may be employed or that the first element must precede the second element in some way.

[0238] As used herein, the term "determining" may encompass a wide variety of actions. For example, "determining" may be considered to be calculating, computing, processing, deriving, investigating, looking up (e.g., looking up in a table, database, or another data structure), ascertaining, etc. Also, "determining" may be considered to be receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in memory), etc. Also, "determining" may be considered to be resolving, selecting, choosing, establishing, comparing, etc. In other words, a "judgment (decision)" may be considered to be a "judgment (decision)" of some action.

[0239] As used herein, the terms "connected," "coupled," or any variation thereof, refer to any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, "connected" may be read as "access."

[0240] As used herein, when two elements are connected, they may be considered to be "connected" or "coupled" to one another using one or more wires, cables, and / or printed electrical connections, as well as using electromagnetic energy having wavelengths in the radio frequency range, microwave range, and / or optical (both visible and invisible) range, as some non-limiting and non-exhaustive examples.

[0241] As used herein, the term "A and B are different" may mean "A and B are different from each other." Terms such as "separate," "coupled," etc. may be interpreted similarly.

[0242] When used in this specification or the claims, the terms "including," "comprising," and variations thereof are intended to be inclusive, similar to the term "comprising." Furthermore, when used in this specification or the claims, the term "or" is not intended to be an exclusive or.

[0243] Although the present invention has been described in detail above, it is clear to those skilled in the art that the present invention is not limited to the embodiments described herein. The present invention can be implemented in modified and altered forms without departing from the spirit and scope of the present invention as defined by the claims. Therefore, the description in this specification is for illustrative purposes only and does not impose any limiting meaning on the present invention.

Claims

1. a receiving unit that receives a system information block (SIB) indicating parameters used in transmitting a reference signal; A terminal characterized by having a control unit that controls measurement of a specific reference signal based on the SIB in idle mode.

2. the receiving unit receives a synchronization signal transmitted using a synchronization spatial resource; The SIB is transmitted using the synchronization spatial resource; The terminal according to claim 1 , wherein the control unit controls measurement of a reference signal transmitted using a spatial resource associated with the synchronization spatial resource based on the SIB.

3. The terminal according to claim 2 , wherein the SIB indicates associations between a plurality of synchronization spatial resources and a plurality of spatial resources, and is transmitted using each of the plurality of synchronization spatial resources.

4. The SIB is one of a plurality of SIBs transmitted using a plurality of synchronization spatial resources, The terminal of claim 2 , wherein each of the plurality of SIBs indicates parameters associated with a corresponding spatial resource for synchronization.

5. 5. The terminal according to claim 1, wherein the SIB indicates a parameter common to a plurality of spatial resources used for transmitting reference signals of neighboring cells.

6. A wireless communication method for a terminal, comprising: receiving a system information block (SIB) indicating parameters for a reference signal; and controlling measurement of a specific reference signal based on the SIB in an idle mode.

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