WO2018128187A1 - ユーザ端末及び無線通信方法 - Google Patents
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- H04W36/0005—Control or signalling for completing the hand-off
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- H04W36/0055—Transmission or use of information for re-establishing the radio link
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Definitions
- the present invention relates to a user terminal and a wireless communication method in a next generation mobile communication system.
- LTE Long Term Evolution
- LTE-A also referred to as LTE Advanced, LTE Rel. 10, 11 or 12
- LTE has been specified for the purpose of further widening and speeding up from LTE (also referred to as LTE Rel. 8 or 9), and LTE.
- Successor systems for example, 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 or Also referred to as after 15).
- CA Carrier Aggregation
- CC Component Carrier
- UE User Equipment
- DC dual connectivity
- CG Cell Group
- CC cell
- Inter-eNB CA inter-base station CA
- LTE Rel. frequency division duplex (FDD) in which downlink (DL) transmission and uplink (UL: Uplink) transmission are performed in different frequency bands, and downlink transmission and uplink transmission are in the same frequency band.
- Time Division Duplex (TDD) which is performed by switching over time, is introduced.
- E-UTRA Evolved Universal Terrestrial Radio Access
- E-UTRAN Evolved Universal Terrestrial Radio Access Network
- Future wireless communication systems for example, 5G, NR are expected to realize various wireless communication services to meet different requirements (for example, ultra-high speed, large capacity, ultra-low delay, etc.) Yes.
- eMBB enhanced Mobile Broad Band
- mMTC massive Machine Type Communication
- URLLC Ultra Reliable and Low Latency Communications
- the present invention has been made in view of the above points, and provides a user terminal and a wireless communication method capable of suppressing a decrease in communication throughput even when a large number of beams and / or transmission / reception points are used.
- a user terminal distinguishes different beams using a correspondence unit between a receiving unit that receives a predetermined signal and the predetermined signal and the beam, and performs beam level measurement based on the predetermined signal. And a measuring unit for performing the measurement.
- the present invention it is possible to suppress a decrease in communication throughput even when a large number of beams and / or transmission / reception points are used.
- FIGS. 1A and 1B are diagrams illustrating an example of a scenario considered by NR.
- FIG. 2 is a conceptual explanatory diagram of the SS block.
- FIG. 3 is a diagram illustrating an example of performing TDM on PSS / SSS / PBCH with different TTIs.
- FIG. 4 is a diagram illustrating an example when TDM is performed on PSS / SSS / PBCH with adjacent symbols.
- FIG. 5 is a diagram illustrating an example when FDM is performed on PSS / SSS / PBCH with the same symbol.
- 6A and 6B are diagrams illustrating an example of the MRS resource pool specified by the MRS configuration information in the second embodiment.
- 7A and 7B are diagrams illustrating an example of the MRS resource pattern.
- FIG. 8A and 8B are diagrams illustrating an example of MRS resource mapping according to the third embodiment.
- FIG. 9 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment of the present invention.
- FIG. 10 is a diagram illustrating an example of the overall configuration of a radio base station according to an embodiment of the present invention.
- FIG. 11 is a diagram illustrating an example of a functional configuration of a radio base station according to an embodiment of the present invention.
- FIG. 12 is a diagram illustrating an example of the overall configuration of a user terminal according to an embodiment of the present invention.
- FIG. 13 is a diagram illustrating an example of a functional configuration of a user terminal according to an embodiment of the present invention.
- FIG. 14 is a diagram illustrating an example of a hardware configuration of a radio base station and a user terminal according to an embodiment of the present invention.
- LTE Rel. 11 coordinated multi-point transmission / reception (CoMP: Coordinated Multi-Point transmission / reception) technology has been specified.
- Dynamic Point Selection (DPS) is possible by performing measurement and reporting based on Information-Reference Signals and switching TRPs for dynamic communication.
- the TRP is a base station, for example, and may be simply referred to as a transmission point (TP) or a reception point (RP).
- TP transmission point
- RP reception point
- 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). , RRM (Radio Resource Management) measurement report.
- PSS Primary Synchronization Signal
- SSS Secondary Synchronization Signal
- CRS cell-specific reference signal
- RRM Radio Resource Management
- the UE may measure received power (for example, RSRP (Reference Signal Received Power)) and report information related to the received power.
- RSRP Reference Signal Received Power
- measurement report may be used interchangeably with “measurement and / or report”.
- the UE is set with a plurality of CSI processes (up to four) for CSI measurement of each TRP from the connected cell.
- the UE measures and reports the CSI-RS transmitted from each TRP based on the setting of the CSI process, and the network dynamically switches the TRP used for transmission / reception with the UE based on the report result (DPS).
- DPS report result
- the UE uses a channel quality indicator (CQI), a precoding matrix indicator (PMI), a precoding type indicator (PTI), a rank indicator (RI: Rank Indicator). ) Etc. may be reported.
- CQI channel quality indicator
- PMI precoding matrix indicator
- PTI precoding type indicator
- RI rank indicator
- Etc. may be reported.
- the network may determine the TRP having the highest signal reception quality in the UE based on the measurement result reported from the UE, and use the TRP for transmission / reception with the UE.
- the TRP of the UE's communication destination can be used without switching the cell or resetting RRC (Radio Resource Control) information. You can continue to communicate with the network while switching. Management (maintenance) of communication when moving within a cell is also referred to as layer 1 / layer 2 mobility (L1 / L2 (Layer 1 / Layer 2) mobility).
- L1 / L2 Layer 1 / Layer 2 mobility
- L1 / L2 mobility cannot be maintained, and switching of connected cells and reconfiguration of RRC information are necessary.
- Management (maintenance) of communication during inter-cell movement is also referred to as layer 3 mobility (L3 mobility).
- FIG. 1 is a diagram illustrating an example of a scenario considered by NR.
- FIG. 1A shows an example in which multiple TRPs are connected to the same baseband unit (BBU)
- FIG. 1B shows an example in which one TRP is connected to a BBU. May be included.
- BBU baseband unit
- transmission / reception of each TRP may be controlled based on the same cell identifier (which may be called a physical cell ID (PCI: Physical Cell Identity), cell ID, etc.).
- the combined area may be treated as the same cell.
- an area obtained by combining the coverage areas of the beams may be handled as the same cell.
- each beam / TRP causes, for example, the following problems: (1) Signaling associated with handover occurs in large quantities (2 ) During the handover process, the terminal goes out of the area to the extent that communication with the connection source cell (source cell) becomes impossible, and the initial connection is redone.
- “beam / TRP” may be used interchangeably with “beam and / or TRP”.
- NR in addition to cell level measurement for switching connected cells, beam / TRP level measurement for recognizing and updating the optimum beam / TRP for the UE is being studied. Specifically, in NR, at least cell level measurement is supported for UE RRC idle mode (RRC_IDLE mode), and at least one of cell level measurement and beam / TRP level measurement is supported for RRC connection mode (RRC_CONNECTED mode). Is being considered.
- RRC_IDLE mode UE RRC idle mode
- RRC_CONNECTED mode RRC connection mode
- the cell level measurement may be read as cell-by-cell measurement, cell-level RRM measurement (measurement that does not distinguish from which beam / TRP the signal is transmitted from the same cell), etc.
- / TRP level measurement may be read as beam / TRP unit measurement, beam / TRP level RRM measurement (measurement that distinguishes measurement results of different beams / TRP), and the like.
- the beam / TRP level measurement is also simply referred to as beam level measurement.
- NR has agreed to support both L3 mobility requiring RRC signaling and L1 / L2 mobility not requiring RRC signaling in the RRC connection mode.
- a beam is transmitted using CSI-RS (RSI for CSI measurement) or mobility reference signal (MRS). It is under consideration to make measurement reports for selection.
- CSI-RS CSI-RS
- MRS mobility reference signal
- the MRS only needs to be a signal that can be used as an RS for RRM measurement, and an existing synchronization signal (for example, PSS / SSS), an existing reference signal (for example, CRS, CSI-RS), or an extension thereof. / It may be a changed signal.
- the MRS may be a PSS for NR (NR-PSS) and / or SSS (NR-SSS), or may be a new reference signal designed for RRM measurement.
- the MRS may be transmitted in one or more beams using one or more antenna ports.
- MRS may also be called a measurement signal, a beam-specific RS, an RS transmitted for each beam, or the like.
- an RS such as MRS
- MRS Mobility Management Entity
- the present inventors have conceived a method for realizing cell level measurement in the idle / connection mode, beam level measurement in the connection mode, and the like with a low signaling load when the UE performs measurement based on the beam.
- a transmission time interval may be read as a predetermined time unit (for example, subframe, slot, minislot, shortened TTI (sTTI: shortened TTI), etc.).
- the TTI may be specified by a predetermined index (for example, a subframe index, a slot index, a minislot index, an sTTI index, etc.).
- the TTI may be called a long TTI or a short TTI.
- FIG. 2 is a conceptual explanatory diagram of the SS block.
- the SS block refers to a resource (or resource set) including at least one of PSS, SSS, and a broadcast channel (PBCH: Physical Broadcast Channel).
- PBCH Physical Broadcast Channel
- PSS, SSS, and PBCH may be read as PSS for NR (NR-PSS), SSS for NR (NR-SSS), and PBCH for NR (NR-PBCH), respectively.
- a set of one or more SS blocks may be referred to as an SS burst.
- the SS burst is composed of L SS blocks (SS block indexes # 0 to # L-1) that are temporally continuous, but is not limited thereto.
- the SS burst may be composed of SS blocks in which frequency and / or time resources are continuous, or may be composed of SS blocks in which frequency and / or time resources are discontinuous.
- the SS burst is preferably transmitted every predetermined period (may be referred to as an SS burst period).
- One or more SS bursts may be referred to as an SS burst set (SS burst series).
- the base station and / or the UE may perform beam sweeping of the PSS / SSS / PBCH using one or more SS bursts included in one SS burst set. Note that the UE may assume that the SS burst set is transmitted periodically (in the SS burst set cycle).
- the base station when a demodulation reference signal (DMRS: DeModulation Reference Signal) for SSS and / or PBCH is used for cell level measurement, the base station transmits an SS block index included in the PBCH.
- the SS block index may be notified to the UE by being included in broadcast information (for example, MIB (Master Information Block)).
- the UE may acquire PCI from PSS / SSS and perform cell level measurement based on one or more SS blocks of the same PCI. Further, the UE may grasp the SS block index from the received PBCH and perform beam level measurement based on SS blocks corresponding to the same PCI and the same SS block index. That is, the UE may perform beam level measurement for each SS block index of each PCI.
- the association (association) between PSS / SSS and PBCH is fixed in the specification.
- PSS / SSS / PBCH corresponding to the same SS block index is transmitted using the same beam.
- the UE may recognize different beams based on the SS block index included in the PBCH, and may perform RRM measurement using the SSS (and DMRS for PBCH) included in the SS block corresponding to the index. .
- the PSS / SSS and the PBCH may be time division multiplexed (TDM) or frequency division multiplexed (FDM).
- TDM time division multiplexed
- FDM frequency division multiplexed
- FIG. 3 is a diagram illustrating an example when TDM is performed on PSS / SSS / PBCH with different TTIs.
- the SS burst set period is, for example, 40 ms, and a plurality of SS bursts are transmitted within the period.
- a plurality of SS blocks respectively corresponding to a plurality of beams are transmitted.
- PSS, SSS, and PBCH are transmitted in this order by beam sweeping for a period of 1 TTI.
- a plurality of signals in each TTI shown in the figure correspond to, for example, SS block indexes # 0 (start) to # 13 (end).
- the UE when the UE recognizes from the information included in the PBCH that it has received the PBCHs of the SS indexes # 0, # 1, and # 2, it receives the PSS and / or SSS with each SS index resource, A beam level measurement result may be acquired. Moreover, when the PCI acquired by these SS indexes is the same, the UE may acquire the cell level measurement result based on the measurement results of the SS indexes # 0, # 1, and # 2.
- the reference signal for PBCH demodulation (DMB for PBCH) is FDMed with PBCH. Since the PBCH resource is temporally separated from the PSS / SSS, the demodulation accuracy of the PBCH can be improved by using another signal for PBCH demodulation.
- FIG. 4 is a diagram illustrating an example when TDM is performed on PSS / SSS / PBCH with adjacent symbols.
- beam sweeping is performed in units of SS blocks composed of 3 symbols. That is, PSS, SSS, and PBCH that constitute the same SS block are transmitted continuously in time.
- the plurality of SS blocks in the illustrated SS burst correspond to, for example, SS block indexes # 0 to # 13, respectively.
- FIG. 5 is a diagram illustrating an example when FDM is performed on PSS / SSS / PBCH with the same symbol.
- the beam is swept and transmitted in units of SS blocks consisting of one symbol within the SS burst. That is, PSS, SSS, and PBCH configuring the same SS block are transmitted at the same time.
- the plurality of SS blocks in the illustrated SS burst correspond to, for example, SS block indexes # 0 to # 13, respectively.
- the measurement of one SS block can be completed in a shorter time than in FIG.
- the UE When reporting the beam level measurement result to the base station, the UE may report the SS block index used for the measurement together with the measurement result or separately from the measurement result. In this case, the network can grasp the beam ID of the beam used by the UE for measurement based on the reported SS block index.
- the UE can use the DMSS for SSS and / or PBCH to perform the cell level measurement in the idle / connection mode and / or the connection mode. Beam level measurements can be made with low signaling load.
- the UE when the UE uses MRS for cell level measurement and / or beam level measurement, the UE is referred to as information on the configuration of the MRS to be searched (measurement target) (referred to as MRS configuration information or the like) And / or the search target ID information.
- These information notifications include upper layer signaling (for example, RRC signaling, MAC (Medium Access Control) signaling, broadcast information (MIB (Master Information Block), SIB (System Information Block), etc.)), physical layer signaling (for example, You may perform using downlink control information (DCI: Downlink Control Information) or these combination.
- upper layer signaling for example, RRC signaling, MAC (Medium Access Control) signaling, broadcast information (MIB (Master Information Block), SIB (System Information Block), etc.
- MIB Master Information Block
- SIB System Information Block
- DCI Downlink Control Information
- the MRS configuration information may be MRS resource information (for example, time and / or frequency resource range (timing, bandwidth, etc.), period, offset, number of antenna ports) or MRS configuration index. .
- MRS resource information for example, time and / or frequency resource range (timing, bandwidth, etc.), period, offset, number of antenna ports
- MRS configuration index for example, time and / or frequency resource range (timing, bandwidth, etc.), period, offset, number of antenna ports) or MRS configuration index.
- the time and / or frequency resources at which the MRS can be transmitted may be referred to as an MRS resource pool.
- the UE can identify and monitor (measure) MRS resources to be measured based on the MRS configuration information.
- the ID information is information that can specify the cell (TRP) and / or beam that transmits the MRS to be RRM-measured.
- the ID information may be information regarding one or more PCI and / or beam IDs, and may be, for example, a PCI (and / or beam ID) range, list, set, or the like.
- the MRS may be a sequence scrambled based on the PCI and / or beam ID. In this case, the UE can perform a measurement process on the MRS that can be descrambled based on the ID information.
- the MRS configuration information and / or ID information is preferably used in common in the serving cell and the neighboring cells (neighboring cells). In this case, since it is not necessary to transmit these pieces of information to the UE for each cell, the signaling overhead and the MRS search burden on the UE can be reduced.
- the base station transmits MRS configuration information for idle mode as broadcast information (for example, SIB), and parameters (period, bandwidth) changed from the MRS configuration information for idle mode for UEs in connected mode. Only the width etc.) may be reported as a difference using higher layer signaling (eg, RRC signaling). Moreover, you may notify the value different from the value notified by SIB about the parameter of part or all of MRS resource structure information with respect to UE of a connection mode by RRC signaling.
- SIB broadcast information
- parameters period, bandwidth
- 6A and 6B are diagrams illustrating an example of the MRS resource pool specified by the MRS configuration information in the second embodiment.
- the UE determines the bandwidth, period (for example, the number of symbols) and period of the MRS resource pool to be searched based on the received SIB, and measures the MRS.
- the MRS resource pool may be configured to include or not include SS / PBCH resources transmitted in the SS burst set cycle.
- the MRS may be multiplexed on the SS block or may be multiplexed outside the SS block.
- the UE determines the MRS resource pool to be searched based on the received SIB, and measures the MRS. Further, as shown in this example, after RRC connection, the UE may be configured with an MRS resource pool having a wider bandwidth and a shorter cycle than the resource pool specified by the SIB by RRC signaling. As a result, UEs in RRC connection can report MRS measurements in a short time, while idle UEs can suppress power consumption by low-frequency MRS measurement processing.
- MRS basic configuration information may be referred to as MRS beam configuration information.
- the MRS basic configuration information includes, for example, information on MRS resource patterns (MRS division resource patterns, multiple resource patterns) in a predetermined time and / or frequency resource (for example, in a resource block (RB) or RB pool) ( For example, it may be an index).
- MRS basic configuration information may include a correspondence relationship between an MRS resource pattern (for example, an MRS resource index) and a beam (for example, a beam ID).
- the MRS basic configuration information may be defined in the specification, or may be notified to the UE by higher layer signaling (for example, RRC signaling, SIB, etc.).
- the UE may perform beam level measurement using MRS by distinguishing different beams based on the MRS basic configuration information. For example, the UE may monitor (measure) the MRS with a resource corresponding to the MRS resource index specified by the MRS basic configuration information. Note that the UE may measure the MRS based on the MRS basic configuration information even when the MRS configuration information and / or ID information is not notified.
- FIGS. 7A and 7B are diagrams illustrating an example of the MRS resource pattern.
- the MRS resource pattern of the region for one RB pair is shown, but the present invention is not limited to this.
- the minimum resource unit (which may be referred to as a minimum MRS resource, an MRS resource, etc.) allocated to the MRS is described as two resource elements (RE), the present invention is not limited to this.
- the MRS When the MRS is transmitted using a certain beam, it may be transmitted by at least one of the plurality of MRS resources.
- a grouping unit of resources associated with a single beam is indicated by a broken line.
- the grouping unit is a plurality of MRS resources that are continuous in the time and frequency directions in FIG. 7A, and a plurality of MRS resources that are discretely arranged in the frequency direction in FIG. 7B.
- the group may be composed of one or more MRS resources, and each MRS resource may be associated with a different beam.
- the UE may assume that MRSs transmitted using MRS resources # 0, # 1, # 12, and # 13 are transmitted using the same beam.
- the UE may assume that MRSs transmitted using MRS resources # 0, # 4, and # 8 are transmitted using the same beam.
- the UE may be notified of the MRS basic configuration information such as the correspondence between the MRS resource index and the group (grouping configuration), information on the MRS resource index that is actually used (or not used), and the like. For example, in FIG. 7B, since the MRS resource # 2 is not used for MRS transmission, the base station may notify the UE of the index # 2 as information on the MRS resource that is not used.
- the UE When reporting the beam level measurement result to the base station, the UE may report the MRS resource index (measured MRS resource index) in the RB or the RB pool together with the measurement result or separately from the measurement result. .
- the network can grasp the beam ID of the beam used by the UE for the measurement based on the reported MRS resource index, it is not necessary to transmit information on the beam ID by MRS.
- the UE can perform cell level measurement and / or beam level measurement by recognizing the MRS resource configuration of the serving cell and neighboring cells with a low signaling load.
- the MRS includes a first part that transmits a sequence based on PCI and a second part that transmits a beam ID. Thereby, it is possible to appropriately perform the beam level measurement by distinguishing different beams using MRS.
- the sequence generation method based on PCI may be the same as PSS and / or SSS (the same sequence as PSS and / or SSS may be used).
- a sequence scrambled with PCI may be transmitted.
- the beam ID is transmitted together with the PCI in the same MRS, and even if the MRSs have the same beam ID, they can be distinguished if the PCI is different. For this reason, it is preferable that the beam IDs do not overlap in the cell.
- the beam ID may be transmitted implicitly by a sequence generated based on the beam ID, or may be explicitly transmitted as a message (modulated data).
- a sequence scrambled with the beam ID may be transmitted in the second part.
- the UE may use the first part of the MRS as a reference signal for demodulating the second part.
- the first part and the second part may be multiplexed using any one of TDM, FDM, Code Division Multiplexing (CDM), or a combination thereof.
- 8A and 8B are diagrams illustrating an example of MRS resource mapping according to the third embodiment.
- the first and second parts of the MRS are mapped using TDM in FIG. 8A and mapped using FDM in FIG. 8B.
- the resource size, number, position, and the like of each part mapped in the frequency and / or time domain are not limited to the example in FIG.
- PCI is transmitted in the first part, but other information may be transmitted as long as information that can identify a cell (TRP) is transmitted.
- the beam ID is transmitted in the second part.
- other information may be transmitted as long as information that can identify the beam is transmitted.
- the beam ID in the third embodiment may be replaced with the SS block index.
- the MRS is composed of two parts.
- the MRS may consist of a single sequence scrambled with both PCI and beam ID, and the UE may identify the PCI and beam ID by demodulating the received MRS sequence.
- the UE can perform the beam level measurement by recognizing the correspondence between the MRS and the beam with a low signaling load.
- the wireless communication method according to each embodiment may be used by appropriately switching (combining).
- the UE performs cell level measurement based on SSS according to the first embodiment in idle mode, and performs cell level / beam level measurement based on MRS according to the second and / or third embodiment in connected mode. May be.
- beams are distinguished by at least one of the following (1) to (9) (difference between a plurality of beams is determined), but is not limited to this.
- (1) resources for example, time and / or frequency resources
- (3) antenna port for example, (4) precoding (for example, presence / absence of precoding, precoding weight) , (5) transmission power, (6) phase rotation, (7) beam width, (8) beam angle (eg, tilt angle), and (9) number of layers.
- beam used herein may be used interchangeably with at least one of the above (1) to (9).
- beam is “resource”, “antenna port” Or the like.
- wireless communication system Wireless communication system
- communication is performed using any one or a combination of the wireless communication methods according to the above embodiments of the present invention.
- FIG. 9 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment of the present invention.
- carrier aggregation (CA) and / or dual connectivity (DC) in which a plurality of basic frequency blocks (component carriers) each having a system bandwidth (for example, 20 MHz) of the LTE system as one unit are applied. can do.
- DC dual connectivity
- the wireless communication system 1 includes LTE (Long Term Evolution), LTE-A (LTE-Advanced), LTE-B (LTE-Beyond), SUPER 3G, IMT-Advanced 4G (4th generation mobile communication system), 5G. (5th generation mobile communication system), FRA (Future Radio Access), New-RAT (Radio Access Technology), etc., or a system that realizes these.
- LTE Long Term Evolution
- LTE-A Long Term Evolution-Advanced
- LTE-B LTE-Beyond
- SUPER 3G IMT-Advanced 4G (4th generation mobile communication system)
- 5G. 5th generation mobile communication system
- FRA Full Radio Access
- New-RAT Radio Access Technology
- the radio communication system 1 includes a radio base station 11 that forms a macro cell C1 having a relatively wide coverage, and a radio base station 12 (12a-12c) that is arranged in the macro cell C1 and forms a small cell C2 that is narrower than the macro cell C1. It is equipped with. Moreover, the user terminal 20 is arrange
- TRP Transmission Reception Points
- 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. Moreover, the user terminal 20 may apply CA or DC using a plurality of cells (CC) (for example, 5 or less CCs, 6 or more CCs).
- CC cells
- Communication between the user terminal 20 and the radio base station 11 can be performed using a carrier having a relatively low frequency band (for example, 2 GHz) and a narrow bandwidth (also referred to as an existing carrier or a legacy carrier).
- a carrier having a relatively high frequency band for example, 3.5 GHz, 5 GHz, etc.
- the same carrier may be used.
- the configuration of the frequency band used by each radio base station is not limited to this.
- a wired connection for example, an optical fiber compliant with CPRI (Common Public Radio Interface), an X2 interface, etc.
- a wireless connection It can be set as the structure to do.
- the radio base station 11 and each radio base station 12 are connected to the higher station apparatus 30 and connected to the core network 40 via the higher station apparatus 30.
- the upper station device 30 includes, for example, an access gateway device, a radio network controller (RNC), a mobility management entity (MME), and the like, but is not limited thereto.
- RNC radio network controller
- MME mobility management entity
- Each radio base station 12 may be connected to the higher station apparatus 30 via the radio base station 11.
- the radio base station 11 is a radio base station having a relatively wide coverage, and may be called a macro base station, an aggregation node, an eNB (eNodeB), a transmission / reception point, or the like.
- the radio base station 12 is a radio base station having local coverage, and includes a small base station, a micro base station, a pico base station, a femto base station, a HeNB (Home eNodeB), an RRH (Remote Radio Head), and transmission / reception. It may be called a point.
- the radio base stations 11 and 12 are not distinguished, they are collectively referred to as a radio base station 10.
- Each user terminal 20 is a terminal that supports various communication schemes 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).
- orthogonal frequency division multiple access (OFDMA) is applied to the downlink, and single carrier-frequency division multiple access (SC-FDMA) is used for the uplink.
- SC-FDMA single carrier-frequency division multiple access
- OFDMA is a multi-carrier transmission scheme that performs communication by dividing a frequency band into a plurality of narrow frequency bands (subcarriers) and mapping data to each subcarrier.
- SC-FDMA is a single-carrier transmission scheme that reduces interference between terminals by dividing the system bandwidth into bands consisting of one or continuous resource blocks for each terminal and using a plurality of terminals with mutually different bands. is there.
- the uplink and downlink radio access schemes are not limited to these combinations, and other radio access schemes may be used.
- downlink channels include a downlink shared channel (PDSCH) shared by each user terminal 20, a broadcast channel (PBCH: Physical Broadcast Channel), a downlink L1 / L2 control channel, and the like. Used. User data, higher layer control information, SIB (System Information Block), etc. are transmitted by PDSCH. Also, MIB (Master Information Block) is transmitted by PBCH.
- PDSCH downlink shared channel
- PBCH Physical Broadcast Channel
- SIB System Information Block
- MIB Master Information Block
- Downlink L1 / L2 control channels include PDCCH (Physical Downlink Control Channel), EPDCCH (Enhanced Physical Downlink Control Channel), PCFICH (Physical Control Format Indicator Channel), PHICH (Physical Hybrid-ARQ Indicator Channel), and the like.
- Downlink control information (DCI: Downlink Control Information) (for example, including PDSCH and / or PUSCH scheduling information) is transmitted by the PDCCH.
- the number of OFDM symbols used for PDCCH is transmitted by PCFICH.
- the PHICH transmits HARQ (Hybrid Automatic Repeat reQuest) acknowledgment information (for example, retransmission control information, HARQ-ACK, ACK / NACK, etc.) to the PUSCH.
- HARQ Hybrid Automatic Repeat reQuest
- EPDCCH is frequency-division multiplexed with PDSCH (downlink shared data channel), and is used for transmission of DCI and the like in the same manner as PDCCH.
- an uplink shared channel (PUSCH) shared by each user terminal 20
- an uplink control channel (PUCCH: Physical Uplink Control Channel)
- a random access channel (PRACH: Physical Random Access Channel)
- User data, higher layer control information, etc. are transmitted by PUSCH.
- downlink radio quality information (CQI: Channel Quality Indicator), delivery confirmation information, and the like are transmitted by PUCCH.
- CQI Channel Quality Indicator
- delivery confirmation information and the like are transmitted by PUCCH.
- a random access preamble for establishing connection with a cell is transmitted by the PRACH.
- a cell-specific reference signal CRS
- CSI-RS channel state information reference signal
- DMRS demodulation reference signal
- PRS Positioning Reference Signal
- a measurement reference signal SRS: Sounding Reference Signal
- a demodulation reference signal DMRS
- the DMRS may be referred to as a user terminal specific reference signal (UE-specific Reference Signal). Further, the transmitted reference signal is not limited to these.
- FIG. 10 is a diagram illustrating an example of the overall configuration of a radio base station according to an embodiment of the present invention.
- the radio base station 10 includes a plurality of transmission / reception antennas 101, an amplifier unit 102, a transmission / reception unit 103, a baseband signal processing unit 104, a call processing unit 105, and a transmission path interface 106.
- the transmission / reception antenna 101, the amplifier unit 102, and the transmission / reception unit 103 may each be configured to include one or more.
- User data transmitted from the radio base station 10 to the user terminal 20 via the downlink is input from the higher station apparatus 30 to the baseband signal processing unit 104 via the transmission path interface 106.
- PDCP Packet Data Convergence Protocol
- RLC Radio Link Control
- MAC Medium Access
- Retransmission control for example, HARQ transmission processing
- scheduling transmission format selection, channel coding, Inverse Fast Fourier Transform (IFFT) processing, precoding processing, and other transmission processing
- IFFT Inverse Fast Fourier Transform
- precoding processing precoding processing, and other transmission processing
- the downlink control signal is also subjected to transmission processing such as channel coding and inverse fast Fourier transform, and is transferred to the transmission / reception unit 103.
- the transmission / reception unit 103 converts the baseband signal output by precoding for each antenna from the baseband signal processing unit 104 to a radio frequency band and transmits the converted signal.
- the radio frequency signal frequency-converted by the transmission / reception unit 103 is amplified by the amplifier unit 102 and transmitted from the transmission / reception antenna 101.
- the transmission / reception unit 103 can be configured by a transmitter / receiver, a transmission / reception circuit, or a transmission / reception device, which is described based on common recognition in the technical field according to the present invention.
- the transmission / reception part 103 may be comprised as an integral transmission / reception part, and may be comprised from a transmission part and a receiving part.
- the radio frequency signal received by the transmission / reception antenna 101 is amplified by the amplifier unit 102.
- the transmission / reception unit 103 receives the uplink signal amplified by the amplifier unit 102.
- the transmission / reception unit 103 converts the frequency of the received signal into a baseband signal and outputs it to the baseband signal processing unit 104.
- the baseband signal processing unit 104 performs Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing, and error correction on user data included in the input upstream signal. Decoding, MAC retransmission control reception processing, RLC layer and PDCP layer reception processing are performed and transferred to the upper station apparatus 30 via the transmission path interface 106.
- the call processor 105 performs communication channel call processing (setting, release, etc.), status management of the radio base station 10, radio resource management, and the like.
- the transmission path interface 106 transmits and receives signals to and from the higher station apparatus 30 via a predetermined interface.
- the transmission path interface 106 transmits / receives signals (backhaul signaling) to / from other radio base stations 10 via an interface between base stations (for example, an optical fiber compliant with CPRI (Common Public Radio Interface), X2 interface). May be.
- CPRI Common Public Radio Interface
- X2 interface May be.
- the transmission / reception unit 103 may further include an analog beam forming unit that performs analog beam forming.
- the analog beam forming unit includes an analog beam forming circuit (for example, phase shifter, phase shift circuit) or an analog beam forming apparatus (for example, phase shifter) described based on common recognition in the technical field according to the present invention. May be.
- the transmission / reception antenna 101 may be constituted by an array antenna, for example.
- the transmission / reception unit 103 transmits a predetermined signal (for example, MRS, SSS, DMRS, etc.) to the user terminal 20. Further, the transmission / reception unit 103 may receive a measurement result (for example, an RRM measurement result, a CSI measurement result) from the user terminal 20.
- a predetermined signal for example, MRS, SSS, DMRS, etc.
- the transmission / reception unit 103 may receive a measurement result (for example, an RRM measurement result, a CSI measurement result) from the user terminal 20.
- the transmission / reception unit 103 may transmit MRS configuration information, ID information, MRS basic configuration information, and the like.
- the transmission / reception unit 103 may transmit the SS block index using a broadcast channel (for example, PBCH).
- the transmission / reception unit 103 may receive the resource index, SS block index, and the like of the measured predetermined signal.
- FIG. 11 is a diagram illustrating an example of a functional configuration of a radio base station according to an embodiment of the present invention.
- the functional block of the characteristic part in this embodiment is mainly shown, and the wireless base station 10 shall also have another functional block required for radio
- the baseband signal processing unit 104 includes at least a control unit (scheduler) 301, a transmission signal generation unit 302, a mapping unit 303, a reception signal processing unit 304, and a measurement unit 305. These configurations may be included in the radio base station 10, and a part or all of the configurations may not be included in the baseband signal processing unit 104.
- the control unit (scheduler) 301 controls the entire radio base station 10.
- the control part 301 can be comprised from the controller, the control circuit, or control apparatus demonstrated based on the common recognition in the technical field which concerns on this invention.
- the control unit 301 controls, for example, signal generation by the transmission signal generation unit 302, signal allocation by the mapping unit 303, and the like.
- the control unit 301 also controls signal reception processing by the reception signal processing unit 304, signal measurement by the measurement unit 305, and the like.
- the control unit 301 schedules system information, downlink data signals (for example, signals transmitted by PDSCH), downlink control signals (for example, signals transmitted by PDCCH and / or EPDCCH, delivery confirmation information, etc.) (for example, resource Control).
- the control unit 301 controls generation of a downlink control signal, a downlink data signal, and the like based on a result of determining whether or not retransmission control is necessary for the uplink data signal.
- the control unit 301 controls scheduling of synchronization signals (for example, PSS (Primary Synchronization Signal) / SSS (Secondary Synchronization Signal)), downlink reference signals (for example, CRS, CSI-RS, DMRS) and the like.
- control unit 301 includes an uplink data signal (for example, a signal transmitted on PUSCH), an uplink control signal (for example, a signal transmitted on PUCCH and / or PUSCH, delivery confirmation information, etc.), a random access preamble (for example, Scheduling of the uplink reference signal and the like.
- uplink data signal for example, a signal transmitted on PUSCH
- uplink control signal for example, a signal transmitted on PUCCH and / or PUSCH, delivery confirmation information, etc.
- a random access preamble for example, Scheduling of the uplink reference signal and the like.
- the control unit 301 uses the digital BF (for example, precoding) by the baseband signal processing unit 104 and / or the analog BF (for example, phase rotation) by the transmission / reception unit 103 to form a transmission beam and / or a reception beam. To control.
- the control unit 301 may perform control so as to form a beam based on downlink propagation path information, uplink propagation path information, and the like. Such propagation path information may be acquired from the reception signal processing unit 304 and / or the measurement unit 305. Note that transmission using a transmission beam may be paraphrased as transmission of a signal to which predetermined precoding is applied.
- the control unit 301 performs control to transmit one or a plurality of predetermined signals (for example, MRS, SSS, DMRS, etc., which may be called measurement signals).
- the control unit 301 controls the user terminal 20 to transmit information related to the correspondence between the predetermined signal and the beam (for example, MRS basic configuration information) so that the user terminal 20 distinguishes different beams. May be.
- the control unit 301 may perform control to transmit SS blocks corresponding to the same SS block index with the same beam.
- the control unit 301 uses the predetermined signal as a first part based on information (for example, PCI) that can specify a cell, a second part based on information (for example, beam ID) that can specify a beam, You may comprise.
- information for example, PCI
- beam ID information that can specify a beam
- the transmission signal generation unit 302 generates a downlink signal (downlink control signal, downlink data signal, downlink reference signal, etc.) based on an instruction from the control unit 301, and outputs it to the mapping unit 303.
- the transmission signal generation unit 302 can be configured by a signal generator, a signal generation circuit, or a signal generation device described based on common recognition in the technical field according to the present invention.
- the transmission signal generation unit 302 generates, for example, a DL assignment that notifies downlink signal allocation information and a UL grant that notifies uplink signal allocation information based on an instruction from the control unit 301.
- the downlink data signal is subjected to coding processing and modulation processing according to a coding rate, a modulation scheme, and the like determined based on channel state information (CSI: Channel State Information) from each user terminal 20.
- CSI Channel State Information
- the mapping unit 303 maps the downlink signal generated by the transmission signal generation unit 302 to a predetermined radio resource based on an instruction from the control unit 301, and outputs it to the transmission / reception unit 103.
- the mapping unit 303 can be configured by a mapper, a mapping circuit, or a mapping device described based on common recognition in the technical field according to the present invention.
- the reception signal processing unit 304 performs reception processing (for example, demapping, demodulation, decoding, etc.) on the reception signal input from the transmission / reception unit 103.
- the received signal is, for example, an uplink signal (uplink control signal, uplink data signal, uplink reference signal, etc.) transmitted from the user terminal 20.
- the reception signal processing unit 304 can be configured by a signal processor, a signal processing circuit, or a signal processing device described based on common recognition in the technical field according to the present invention.
- the reception signal processing unit 304 outputs the information decoded by the reception processing to the control unit 301. For example, when receiving PUCCH including HARQ-ACK, HARQ-ACK is output to control section 301.
- the reception signal processing unit 304 outputs the reception signal and / or the signal after reception processing to the measurement unit 305.
- the measurement unit 305 performs measurement on the received signal.
- the measurement part 305 can be comprised from the measuring device, measurement circuit, or measurement apparatus demonstrated based on common recognition in the technical field which concerns on this invention.
- the measurement unit 305 may perform RRM (Radio Resource Management) measurement, CSI (Channel State Information) measurement, and the like based on the received signal.
- the measurement unit 305 receives received power (for example, RSRP (Reference Signal Received Power)), received quality (for example, RSRQ (Reference Signal Received Quality), SINR (Signal to Interference plus Noise Ratio)), signal strength (for example, RSSI ( Received Signal Strength Indicator)), propagation path information (for example, CSI), etc. may be measured.
- the measurement result may be output to the control unit 301.
- FIG. 12 is a diagram illustrating an example of the overall configuration of a user terminal according to an embodiment of the present invention.
- the user terminal 20 includes a plurality of transmission / reception antennas 201, an amplifier unit 202, a transmission / reception unit 203, a baseband signal processing unit 204, and an application unit 205.
- the transmission / reception antenna 201, the amplifier unit 202, and the transmission / reception unit 203 may each be configured to include one or more.
- the radio frequency signal received by the transmission / reception antenna 201 is amplified by the amplifier unit 202.
- the transmission / reception unit 203 receives the downlink signal amplified by the amplifier unit 202.
- the transmission / reception unit 203 converts the frequency of the received signal into a baseband signal and outputs it to the baseband signal processing unit 204.
- the transmission / reception unit 203 can be configured by a transmitter / receiver, a transmission / reception circuit, or a transmission / reception device described based on common recognition in the technical field according to the present invention.
- the transmission / reception unit 203 may be configured as an integral transmission / reception unit, or may be configured from a transmission unit and a reception unit.
- the baseband signal processing unit 204 performs FFT processing, error correction decoding, retransmission control reception processing, and the like on the input baseband signal.
- the downlink user data is transferred to the application unit 205.
- the application unit 205 performs processing related to layers higher than the physical layer and the MAC layer. Also, broadcast information of downlink data may be transferred to the application unit 205.
- 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 / reception units for retransmission control (for example, HARQ transmission processing), channel coding, precoding, discrete Fourier transform (DFT) processing, IFFT processing, and the like.
- the transmission / reception unit 203 converts the baseband signal output from the baseband signal processing unit 204 into a radio frequency band and transmits it.
- the radio frequency signal frequency-converted by the transmission / reception unit 203 is amplified by the amplifier unit 202 and transmitted from the transmission / reception antenna 201.
- the transmission / reception unit 203 may further include an analog beam forming unit that performs analog beam forming.
- the analog beam forming unit includes an analog beam forming circuit (for example, phase shifter, phase shift circuit) or an analog beam forming apparatus (for example, phase shifter) described based on common recognition in the technical field according to the present invention. May be.
- the transmission / reception antenna 201 may be constituted by an array antenna, for example.
- the transmission / reception unit 203 receives a predetermined signal (for example, MRS, SSS, DMRS, etc.) from the radio base station 10. Further, the transmission / reception unit 203 may report (transmit) the measurement results (for example, the RRM measurement result and the CSI measurement result) output from the measurement unit 405 to the radio base station 10.
- a predetermined signal for example, MRS, SSS, DMRS, etc.
- the transmission / reception unit 203 may report (transmit) the measurement results (for example, the RRM measurement result and the CSI measurement result) output from the measurement unit 405 to the radio base station 10.
- the transmission / reception unit 203 may receive an SS block index, MRS configuration information, ID information, MRS basic configuration information, and the like.
- the transmission / reception unit 203 may transmit the resource index, SS block index, etc. of the measured predetermined signal.
- FIG. 13 is a diagram illustrating an example of a functional configuration of a user terminal according to an embodiment of the present invention.
- the functional blocks of the characteristic part in the present embodiment are mainly shown, and the user terminal 20 also has other functional blocks necessary for wireless communication.
- 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 configurations may be included in the user terminal 20, and some or all of the configurations may not be included in the baseband signal processing unit 204.
- the control unit 401 controls the entire user terminal 20.
- the control unit 401 can be composed of a controller, a control circuit, or a control device described based on common recognition in the technical field according to the present invention.
- the control unit 401 controls, for example, signal generation by the transmission signal generation unit 402, signal allocation by the mapping unit 403, and the like.
- the control unit 401 also controls signal reception processing by the reception signal processing unit 404, signal measurement by the measurement unit 405, and the like.
- the control unit 401 acquires the downlink control signal and the downlink data signal transmitted from the radio base station 10 from the reception signal processing unit 404.
- the control unit 401 controls the generation of the uplink control signal and / or the uplink data signal based on the result of determining the necessity of retransmission control for the downlink control signal and / or the downlink data signal.
- the control unit 401 uses the digital BF (for example, precoding) by the baseband signal processing unit 204 and / or the analog BF (for example, phase rotation) by the transmission / reception unit 203 to form a transmission beam and / or a reception beam. You may control to.
- the control unit 401 may perform control so as to form a beam based on downlink propagation path information, uplink propagation path information, and the like. Such propagation path information may be acquired from the reception signal processing unit 404 and / or the measurement unit 405.
- the control unit 401 may control the measurement of the measurement unit 405 based on a predetermined signal (for example, MRS, SSS, DMRS, etc.).
- a predetermined signal for example, MRS, SSS, DMRS, etc.
- control unit 401 may update parameters used for control based on the information.
- the transmission signal generation unit 402 generates an uplink signal (uplink control signal, uplink data signal, uplink reference signal, etc.) based on an instruction from the control unit 401 and outputs the uplink signal to the mapping unit 403.
- the transmission signal generation unit 402 can be configured by a signal generator, a signal generation circuit, or a signal generation device described based on common recognition in the technical field according to the present invention.
- the transmission signal generation unit 402 generates an uplink control signal related to delivery confirmation information, channel state information (CSI), and the like based on an instruction from the control unit 401, for example. In addition, the transmission signal generation unit 402 generates an uplink data signal based on an instruction from the control unit 401. For example, the transmission signal generation unit 402 is instructed by the control unit 401 to generate an uplink data signal when the UL grant is included in the downlink control signal notified from the radio base station 10.
- CSI channel state information
- the mapping unit 403 maps the uplink signal generated by the transmission signal generation unit 402 to a radio resource based on an instruction from the control unit 401, and outputs the radio signal to the transmission / reception unit 203.
- the mapping unit 403 can be configured by a mapper, a mapping circuit, or a mapping device described based on common recognition in the technical field according to the present invention.
- the reception signal processing unit 404 performs reception processing (for example, demapping, demodulation, decoding, etc.) on the reception signal input from the transmission / reception unit 203.
- the received signal is, for example, a downlink signal (downlink control signal, downlink data signal, downlink reference signal, etc.) transmitted from the radio base station 10.
- the reception signal processing unit 404 can be configured by a signal processor, a signal processing circuit, or a signal processing device described based on common recognition in the technical field according to the present invention. Further, the reception signal processing unit 404 can constitute a reception unit according to the present invention.
- the reception signal processing unit 404 outputs the information decoded by the reception processing to the control unit 401.
- the reception signal processing unit 404 outputs, for example, broadcast information, system information, RRC signaling, DCI, and the like to the control unit 401.
- the reception signal processing unit 404 outputs the reception signal and / or the signal after reception processing to the measurement unit 405.
- the measurement unit 405 performs measurement on the received signal.
- the measurement part 405 can be comprised from the measuring device, measurement circuit, or measurement apparatus demonstrated based on common recognition in the technical field which concerns on this invention.
- the measurement unit 405 may perform RRM measurement, CSI measurement, and the like based on the received signal.
- the measurement unit 405 may measure received power (for example, RSRP), reception quality (for example, RSRQ, SINR), signal strength (for example, RSSI), propagation path information (for example, CSI), and the like.
- the measurement result may be output to the control unit 401.
- the measurement unit 405 may perform cell level measurement based on a predetermined signal (for example, MRS, SSS, DMRS, etc.). In addition, the measurement unit 405 distinguishes different beams using a correspondence relationship between predetermined signals (for example, MRS, SSS, DMRS, etc.) and beams (distinguishes the predetermined signals transmitted by different beams), and Beam level measurement based on the predetermined signal may be performed.
- a predetermined signal for example, MRS, SSS, DMRS, etc.
- Beam level measurement based on the predetermined signal may be performed.
- the cell level measurement and / or the beam level measurement may be RRM measurement or other measurement.
- the measurement unit 405 may determine that SS blocks corresponding to the SS block index acquired from the received signal processing unit 404 (for example, received by the broadcast channel (PBCH)) are transmitted using the same beam. In this case, the measurement unit 405 may perform beam level measurement based on the predetermined signal included in the SS block corresponding to the same SS block index.
- PBCH broadcast channel
- the measurement unit 405 may derive a cell level measurement result regarding a cell of the predetermined PCI using a measurement result of an SS block corresponding to the predetermined PCI among the measurement results regarding one or a plurality of SS blocks. .
- the measurement unit 405 uses the measurement results of SS blocks corresponding to the same PCI and the same SS block index among the measurement results of one or a plurality of SS blocks, and relates to a predetermined beam of the cell of the predetermined PCI.
- the beam level measurement result may be derived.
- the measurement unit 405 uses at least one of configuration information (for example, MRS configuration information) regarding the predetermined signal and ID information (for example, information regarding one or more PCIs and / or beam IDs), and Cell level measurement and / or beam level measurement based on a predetermined signal may be performed.
- configuration information for example, MRS configuration information
- ID information for example, information regarding one or more PCIs and / or beam IDs
- Cell level measurement and / or beam level measurement based on a predetermined signal may be performed.
- the measurement unit 405 may perform beam level measurement based on the predetermined signal by distinguishing different beams based on information on the correspondence relationship between the resource index of the predetermined signal and the beam.
- the measurement unit 405 includes a first part that is generated based on information that can specify a cell (for example, PCI) and a second part that is generated based on information that can specify a beam (for example, a beam ID). May be used to measure the beam level based on the predetermined signal. In this case, the measurement unit 405 may distinguish different beams based on the second part.
- a cell for example, PCI
- a beam ID for example, a beam ID
- each functional block may be realized by one device physically and / or logically coupled, and two or more devices physically and / or logically separated may be directly and / or indirectly. (For example, wired and / or wireless) and may be realized by these plural devices.
- a radio base station, a user terminal, etc. in an embodiment of the present invention may function as a computer that performs processing of the radio communication method of the present invention.
- FIG. 14 is a diagram illustrating an example of a hardware configuration of a radio base station and a user terminal according to an embodiment of the present invention.
- the wireless base station 10 and the user terminal 20 described above may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like. Good.
- the term “apparatus” can be read as a circuit, a device, a unit, or the like.
- the hardware configurations of the radio base station 10 and the user terminal 20 may be configured to include one or a plurality of each device illustrated in the figure, or may be configured not to include some devices.
- processor 1001 may be implemented by one or more chips.
- each function in the radio base station 10 and the user terminal 20 reads predetermined software (program) on hardware such as the processor 1001 and the memory 1002, so that the processor 1001 performs computation and communication by the communication device 1004. It is realized by controlling the reading and / or writing of data in the memory 1002 and the storage 1003.
- the processor 1001 controls the entire computer by operating an operating system, for example.
- the processor 1001 may be configured by a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, a register, and the like.
- CPU central processing unit
- the baseband signal processing unit 104 (204) and the call processing unit 105 described above may be realized by the processor 1001.
- the processor 1001 reads programs (program codes), software modules, data, and the like from the storage 1003 and / or the communication device 1004 to the memory 1002, and executes various processes according to these.
- programs program codes
- software modules software modules
- data data
- the like data
- the control unit 401 of the user terminal 20 may be realized by a control program stored in the memory 1002 and operated by the processor 1001, and may be realized similarly for other functional blocks.
- the memory 1002 is a computer-readable recording medium such as a ROM (Read Only Memory), an EPROM (Erasable Programmable ROM), an EEPROM (Electrically EPROM), a RAM (Random Access Memory), or any other suitable storage medium. It may be configured by one.
- the memory 1002 may be called a register, a cache, a main memory (main storage device), or the like.
- the memory 1002 can store programs (program codes), software modules, and the like that can be executed to implement the wireless communication method according to an embodiment of the present invention.
- the storage 1003 is a computer-readable recording medium such as a flexible disk, a floppy (registered trademark) disk, a magneto-optical disk (for example, a compact disk (CD-ROM (Compact Disc ROM)), a digital versatile disk, Blu-ray® disk), removable disk, hard disk drive, smart card, flash memory device (eg, card, stick, key drive), magnetic stripe, database, server, or other suitable storage medium It may be constituted by.
- the storage 1003 may be referred to as an auxiliary storage device.
- the communication device 1004 is hardware (transmission / reception device) for performing communication between computers via a wired and / or wireless network, and is also referred to as a network device, a network controller, a network card, a communication module, or the like.
- the communication device 1004 includes, for example, a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc., in order to realize frequency division duplex (FDD) and / or time division duplex (TDD). It may be configured.
- FDD frequency division duplex
- TDD time division duplex
- the transmission / reception antenna 101 (201), the amplifier unit 102 (202), the transmission / reception unit 103 (203), the transmission path interface 106, and the like described above may be realized by the communication device 1004.
- the input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that accepts an input from the outside.
- the output device 1006 is an output device (for example, a display, a speaker, an LED (Light Emitting Diode) lamp, etc.) that performs output to the outside.
- the input device 1005 and the output device 1006 may have an integrated configuration (for example, a touch panel).
- 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 with a single bus or may be configured with different buses between apparatuses.
- the radio base station 10 and the user terminal 20 include a microprocessor, a digital signal processor (DSP), an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), an FPGA (Field Programmable Gate Array), and the like. It may be configured including hardware, and a part or all of each functional block may be realized by the hardware. For example, the processor 1001 may be implemented by at least one of these hardware.
- DSP digital signal processor
- ASIC Application Specific Integrated Circuit
- PLD Programmable Logic Device
- FPGA Field Programmable Gate Array
- the channel and / or symbol may be a signal (signaling).
- the signal may be a message.
- the reference signal may be abbreviated as RS (Reference Signal), and may be referred to as a pilot, a pilot signal, or the like depending on an applied standard.
- a component carrier CC: Component Carrier
- CC Component Carrier
- the radio frame may be configured with one or a plurality of periods (frames) in the time domain.
- Each of the one or more periods (frames) constituting the radio frame may be referred to as a subframe.
- a subframe may be composed of one or more slots in the time domain.
- the subframe may have a fixed time length (eg, 1 ms) that does not depend on the neurology.
- the slot may be configured with one or a plurality of symbols (OFDM (Orthogonal Frequency Division Multiplexing) symbol, SC-FDMA (Single Carrier Frequency Division Multiple Access) symbol, etc.) in the time domain). Further, the slot may be a time unit based on the numerology.
- the slot may include a plurality of mini slots. Each minislot may be composed of one or more symbols in the time domain. The minislot may also be called a subslot.
- Radio frame, subframe, slot, minislot, and symbol all represent time units when transmitting signals. Different names may be used for the radio frame, subframe, slot, minislot, and symbol.
- one subframe may be called a transmission time interval (TTI)
- TTI transmission time interval
- a plurality of consecutive subframes may be called a TTI
- TTI slot or one minislot
- a unit representing TTI may be called a slot, a minislot, or the like instead of a subframe.
- TTI means, for example, a minimum time unit for scheduling in wireless communication.
- a radio base station performs scheduling for assigning radio resources (frequency bandwidth, transmission power, etc. that can be used in each user terminal) to each user terminal in units of TTI.
- the definition of TTI is not limited to this.
- the TTI may be a transmission time unit of a channel-encoded data packet (transport block), a code block, and / or a code word, or may be a processing unit such as scheduling or link adaptation.
- a time interval for example, the number of symbols
- a transport block, a code block, and / or a code word is actually mapped may be shorter than the TTI.
- one or more TTIs may be the minimum scheduling unit. Further, the number of slots (the number of mini-slots) constituting the minimum time unit of the scheduling may be controlled.
- a TTI having a time length of 1 ms may be called a normal TTI (TTI in LTE Rel. 8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, or a long subframe.
- a TTI shorter than a normal TTI may be called a shortened TTI, a short TTI, a partial TTI (partial or fractional TTI), a shortened subframe, a short subframe, a minislot, or a subslot.
- a long TTI (eg, normal TTI, subframe, etc.) may be read as a TTI having a time length exceeding 1 ms, and a short TTI (eg, shortened TTI) is less than the TTI length of the long TTI and 1 ms. It may be replaced with a TTI having the above TTI length.
- a resource block is a resource allocation unit in the time domain and the frequency domain, and may include one or a plurality of continuous subcarriers (subcarriers) in the frequency domain. Further, the RB may include one or a plurality of symbols in the time domain, and may have a length of 1 slot, 1 mini slot, 1 subframe, or 1 TTI. One TTI and one subframe may each be composed of one or a plurality of resource blocks.
- One or more RBs include physical resource blocks (PRB), sub-carrier groups (SCG), resource element groups (REG), PRB pairs, RB pairs, etc. May be called.
- the resource block may be composed of one or a plurality of resource elements (RE: Resource Element).
- RE Resource Element
- 1RE may be a radio resource region of 1 subcarrier and 1 symbol.
- the structure of the above-described radio frame, subframe, slot, minislot, symbol, etc. is merely an 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 the slot, the number of symbols and RBs included in the slot or minislot, and the RB The number of subcarriers, the number of symbols in the TTI, the symbol length, the cyclic prefix (CP) length, and the like can be variously changed.
- information, parameters, and the like described in this specification may be represented by absolute values, may be represented by relative values from a predetermined value, or may be represented by other corresponding information.
- the radio resource may be indicated by a predetermined index.
- mathematical formulas and the like using these parameters may differ from those explicitly disclosed herein.
- PUCCH Physical Uplink Control Channel
- PDCCH Physical Downlink Control Channel
- information elements can be identified by any suitable name, so the various channels and information elements assigned to them.
- the name is not limiting in any way.
- information, signals, etc. can be output from the upper layer to the lower layer and / or from the lower layer to the upper layer.
- Information, signals, and the like may be input / output via a plurality of network nodes.
- the input / output information, signals, etc. may be stored in a specific location (for example, a memory), or may be managed by a management table. Input / output information, signals, and the like can be overwritten, updated, or added. The output information, signals, etc. may be deleted. Input information, signals, and the like may be transmitted to other devices.
- information notification includes physical layer signaling (eg, downlink control information (DCI), uplink control information (UCI)), upper layer signaling (eg, RRC (Radio Resource Control) signaling), It may be implemented by broadcast information (Master Information Block (MIB), System Information Block (SIB), etc.), MAC (Medium Access Control) signaling), other signals, or a combination thereof.
- DCI downlink control information
- UCI uplink control information
- RRC Radio Resource Control
- MIB Master Information Block
- SIB System Information Block
- MAC Medium Access Control
- the physical layer signaling may be referred to as L1 / L2 (Layer 1 / Layer 2) control information (L1 / L2 control signal), L1 control information (L1 control signal), or the like.
- the RRC signaling may be referred to as an RRC message, and may be, for example, an RRC connection setup (RRCConnectionSetup) message, an RRC connection reconfiguration (RRCConnectionReconfiguration) message, or the like.
- the MAC signaling may be notified by, for example, a MAC control element (MAC CE (Control Element)).
- notification of predetermined information is not limited to explicitly performed, but implicitly (for example, by not performing notification of the predetermined information or another (By notification of information).
- the determination may be performed by a value represented by 1 bit (0 or 1), or may be performed by a boolean value represented by true or false.
- the comparison may be performed by numerical comparison (for example, comparison with a predetermined value).
- software, instructions, information, etc. may be transmitted / received via a transmission medium.
- software can use websites, servers using wired technology (coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), etc.) and / or wireless technology (infrared, microwave, etc.) , Or other remote sources, these wired and / or wireless technologies are included within the definition of transmission media.
- system and “network” used in this specification are used interchangeably.
- base station BS
- radio base station eNB
- gNB gNodeB
- cell cell
- cell group cell group
- carrier carrier
- component carrier carrier
- a base station is a term such as fixed station, NodeB, eNodeB (eNB), access point, access point (TRP: Transmission Reception Point), transmission point, reception point, femto cell, small cell, etc. Sometimes called.
- the base station can accommodate one or a plurality of (for example, three) cells (also called sectors). If the base station accommodates multiple cells, the entire coverage area of the base station can be partitioned into multiple smaller areas, each smaller area being a base station subsystem (eg, an indoor small base station (RRH: The term “cell” or “sector” refers to part or all of the coverage area of a base station and / or base station subsystem that provides communication service in this coverage. Point to.
- RRH indoor small base station
- MS mobile station
- UE user equipment
- terminal may be used interchangeably.
- a base station may also be called in terms such as a fixed station, NodeB, eNodeB (eNB), access point, transmission point, reception point, femtocell, and small cell.
- NodeB NodeB
- eNodeB eNodeB
- access point transmission point
- reception point femtocell
- small cell small cell
- a mobile station is defined by those skilled in the art as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless It may also be called terminal, remote terminal, handset, user agent, mobile client, client or some other suitable terminology.
- the radio base station in this specification may be read by the user terminal.
- each aspect / embodiment of the present invention may be applied to a configuration in which communication between a radio base station and a user terminal is replaced with communication between a plurality of user terminals (D2D: Device-to-Device).
- the user terminal 20 may have a function that the wireless base station 10 has.
- words such as “up” and “down” may be read as “side”.
- the uplink channel may be read as a side channel.
- a user terminal in this specification may be read by a radio base station.
- the wireless base station 10 may have a function that the user terminal 20 has.
- the specific operation assumed to be performed by the base station may be performed by the upper node in some cases.
- various operations performed for communication with a terminal may be performed by one or more network nodes other than the base station and the base station (for example, It is obvious that this can be done by MME (Mobility Management Entity), S-GW (Serving-Gateway), etc., but not limited thereto) or a combination thereof.
- MME Mobility Management Entity
- S-GW Serving-Gateway
- each aspect / embodiment described in this specification may be used alone, in combination, or may be switched according to execution.
- the order of the processing procedures, sequences, flowcharts, and the like of each aspect / embodiment described in this specification may be changed as long as there is no contradiction.
- the methods described herein present the elements of the various steps in an exemplary order and are not limited to the specific order presented.
- Each aspect / embodiment described herein includes LTE (Long Term Evolution), LTE-A (LTE-Advanced), LTE-B (LTE-Beyond), SUPER 3G, IMT-Advanced, 4G (4th generation mobile). communication system), 5G (5th generation mobile communication system), FRA (Future Radio Access), New-RAT (Radio Access Technology), NR (New Radio), NX (New radio access), FX (Future generation radio access), GSM (registered trademark) (Global System for Mobile communications), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802 .20, UWB (Ultra-WideBand), Bluetooth (registered trademark), The present invention may be applied to a system using other appropriate wireless communication methods and / or a next generation system extended based on these.
- the phrase “based on” does not mean “based only on”, unless expressly specified otherwise. In other words, the phrase “based on” means both “based only on” and “based at least on.”
- any reference to elements using designations such as “first”, “second”, etc. as used herein does not generally limit the amount or order of those elements. These designations can be used herein as a convenient way to distinguish between two or more elements. Thus, reference to the first and second elements does not mean that only two elements can be employed or that the first element must precede the second element in some way.
- determining may encompass a wide variety of actions. For example, “determination” means calculating, computing, processing, deriving, investigating, looking up (eg, table, database or other data). It may be considered to “judge” (search in structure), ascertaining, etc.
- “determination (decision)” includes receiving (for example, receiving information), transmitting (for example, transmitting information), input (input), output (output), access ( accessing) (e.g., accessing data in memory), etc. may be considered to be “determining”. Also, “determination” is considered to be “determination (resolving)”, “selecting”, “choosing”, “establishing”, “comparing”, etc. Also good. That is, “determination (determination)” may be regarded as “determination (determination)” of some operation.
- connection refers to any direct or indirect connection between two or more elements or By coupling, it can 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 the elements may be physical, logical, or a combination thereof.
- connection may be read as “access”.
- the two elements are radio frequency by using one or more wires, cables and / or printed electrical connections, and as some non-limiting and non-inclusive examples It can be considered to be “connected” or “coupled” to each other, such as by using electromagnetic energy having wavelengths in the region, microwave region, and / or light (both visible and invisible) region.
- a and B are different may represent that A and B are different from each other.
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Abstract
Description
<第1の実施形態>
本発明の第1の実施形態について説明する前に、まずSS(同期信号)ブロックについて説明する。図2は、SSブロックの概念説明図である。SSブロックは、PSS、SSS及びブロードキャストチャネル(PBCH:Physical Broadcast Channel)の少なくとも1つを含むリソース(又はリソースセット)のことをいう。
本発明の第2の実施形態では、UEがMRSをセルレベル測定及び/又はビームレベル測定に用いる場合、UEは、サーチ対象(測定対象)のMRSの構成に関する情報(MRS構成情報などと呼ばれてもよい)及び/又はサーチ対象のID情報を通知される。
本発明の第3の実施形態では、MRSを、PCIに基づく系列を送信する第1の部分と、ビームIDを伝送する第2の部分と、から構成する。これにより、MRSを用いて、異なるビームを区別して好適にビームレベル測定を実施できる。
なお、各実施形態に係る無線通信方法は、適宜切り替えて(組み合わせて)用いられてもよい。例えば、UEは、アイドルモードでは第1の実施形態に従ってSSSに基づくセルレベル測定を実施し、接続モードでは第2及び/又は第3の実施形態に従ってMRSに基づくセルレベル/ビームレベル測定を実施してもよい。
以下、本発明の一実施形態に係る無線通信システムの構成について説明する。この無線通信システムでは、本発明の上記各実施形態に係る無線通信方法のいずれか又はこれらの組み合わせを用いて通信が行われる。
図10は、本発明の一実施形態に係る無線基地局の全体構成の一例を示す図である。無線基地局10は、複数の送受信アンテナ101と、アンプ部102と、送受信部103と、ベースバンド信号処理部104と、呼処理部105と、伝送路インターフェース106と、を備えている。なお、送受信アンテナ101、アンプ部102、送受信部103は、それぞれ1つ以上を含むように構成されればよい。
図12は、本発明の一実施形態に係るユーザ端末の全体構成の一例を示す図である。ユーザ端末20は、複数の送受信アンテナ201と、アンプ部202と、送受信部203と、ベースバンド信号処理部204と、アプリケーション部205と、を備えている。なお、送受信アンテナ201、アンプ部202、送受信部203は、それぞれ1つ以上を含むように構成されればよい。
なお、上記実施形態の説明に用いたブロック図は、機能単位のブロックを示している。これらの機能ブロック(構成部)は、ハードウェア及び/又はソフトウェアの任意の組み合わせによって実現される。また、各機能ブロックの実現手段は特に限定されない。すなわち、各機能ブロックは、物理的及び/又は論理的に結合した1つの装置により実現されてもよいし、物理的及び/又は論理的に分離した2つ以上の装置を直接的及び/又は間接的に(例えば、有線及び/又は無線)で接続し、これら複数の装置により実現されてもよい。
なお、本明細書で説明した用語及び/又は本明細書の理解に必要な用語については、同一の又は類似する意味を有する用語と置き換えてもよい。例えば、チャネル及び/又はシンボルは信号(シグナリング)であってもよい。また、信号はメッセージであってもよい。参照信号は、RS(Reference Signal)と略称することもでき、適用される標準によってパイロット(Pilot)、パイロット信号などと呼ばれてもよい。また、コンポーネントキャリア(CC:Component Carrier)は、セル、周波数キャリア、キャリア周波数などと呼ばれてもよい。
Claims (6)
- 所定の信号を受信する受信部と、
前記所定の信号とビームとの対応関係を用いて異なるビームを区別して、前記所定の信号に基づくビームレベル測定を行う測定部と、を有することを特徴とするユーザ端末。 - 前記受信部は、同期信号ブロックインデックスを受信し、
前記測定部は、前記同期信号ブロックインデックスに対応する同期信号ブロックが同一のビームで送信されると判断して、当該同期信号ブロックに含まれる前記所定の信号に基づくビームレベル測定を行うことを特徴とする請求項1に記載のユーザ端末。 - 前記受信部は、前記所定の信号の構成情報と、測定すべき前記所定の信号を送信するセル及び/又はビームを特定可能なID情報と、の少なくとも1つを受信し、
前記測定部は、前記構成情報及び前記ID情報の少なくとも1つを用いて、前記所定の信号に基づくセルレベル測定及び/又はビームレベル測定を行うことを特徴とする請求項1に記載のユーザ端末。 - 前記測定部は、前記所定の信号のリソースインデックスとビームとの対応関係の情報に基づいて異なるビームを区別して、前記所定の信号に基づくビームレベル測定を行うことを特徴とする請求項3に記載のユーザ端末。
- 前記所定の信号は、セルを特定可能な情報に基づいて生成される第1の部分と、ビームを特定可能な情報に基づいて生成される第2の部分と、から構成され、
前記測定部は、前記第2の部分に基づいて異なるビームを区別して、前記所定の信号に基づくビームレベル測定を行うことを特徴とする請求項1に記載のユーザ端末。 - 所定の信号を受信する工程と、
前記所定の信号とビームとの対応関係を用いて異なるビームを区別して、前記所定の信号に基づくビームレベル測定を行う工程と、を有することを特徴とする無線通信方法。
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CN201880016195.5A CN110383884B (zh) | 2017-01-06 | 2018-01-05 | 用户终端及无线通信方法 |
JP2018560407A JP7074687B2 (ja) | 2017-01-06 | 2018-01-05 | 端末、無線通信方法、基地局及びシステム |
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US16/476,197 US11678206B2 (en) | 2017-01-06 | 2018-01-05 | Terminal, base station and radio communication method using a plurality of synchronization signal blocks |
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- 2018-01-05 JP JP2018560407A patent/JP7074687B2/ja active Active
- 2018-01-05 CN CN201880016195.5A patent/CN110383884B/zh active Active
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US11968013B2 (en) | 2017-04-04 | 2024-04-23 | Qualcomm Incorporated | Beam management using synchronization signals through channel feedback framework |
JP7460691B2 (ja) | 2017-04-04 | 2024-04-02 | クアルコム,インコーポレイテッド | チャネルフィードバックフレームワークを介する同期信号を使用するビーム管理 |
JP2022128479A (ja) * | 2017-04-04 | 2022-09-01 | クアルコム,インコーポレイテッド | チャネルフィードバックフレームワークを介する同期信号を使用するビーム管理 |
CN112385279A (zh) * | 2018-07-18 | 2021-02-19 | 株式会社Ntt都科摩 | 用户装置及基站装置 |
CN112385279B (zh) * | 2018-07-18 | 2024-04-02 | 株式会社Ntt都科摩 | 用户装置及基站装置 |
WO2020016975A1 (ja) * | 2018-07-18 | 2020-01-23 | 株式会社Nttドコモ | ユーザ装置及び基地局装置 |
JP7342970B2 (ja) | 2019-04-30 | 2023-09-12 | 富士通株式会社 | Ssbに基づく測定方法及び装置 |
JP2022531078A (ja) * | 2019-04-30 | 2022-07-06 | 富士通株式会社 | Ssbに基づく測定方法及び装置 |
CN112235837B (zh) * | 2019-07-15 | 2022-07-12 | 华为技术有限公司 | 一种切换方法以及通信装置 |
CN112235837A (zh) * | 2019-07-15 | 2021-01-15 | 华为技术有限公司 | 一种切换方法以及通信装置 |
JP2023513416A (ja) * | 2020-02-19 | 2023-03-31 | 中興通訊股▲ふん▼有限公司 | ダウンリンク-アップリンクタイミング関係のシステムおよび方法 |
JP7021273B2 (ja) | 2020-03-04 | 2022-02-16 | アンリツ株式会社 | 信号処理装置とそのインデックス情報推測方法 |
JP2021141414A (ja) * | 2020-03-04 | 2021-09-16 | アンリツ株式会社 | 信号処理装置とそのインデックス情報推測方法 |
Also Published As
Publication number | Publication date |
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US20200029229A1 (en) | 2020-01-23 |
CN110383884A (zh) | 2019-10-25 |
CN110383884B (zh) | 2021-12-21 |
CA3049318A1 (en) | 2018-07-12 |
JP7074687B2 (ja) | 2022-05-24 |
EP3567918B1 (en) | 2022-03-23 |
JPWO2018128187A1 (ja) | 2019-11-07 |
EP3567918A4 (en) | 2020-08-12 |
US11678206B2 (en) | 2023-06-13 |
EP3567918A1 (en) | 2019-11-13 |
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