WO2018143399A1 - ユーザ端末及び無線通信方法 - Google Patents
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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, 12 or 13
- 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.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
- a synchronization signal (PSS, SSS), a broadcast channel (PBCH), and the like that are used by the user terminal for the initial access operation are fixedly defined in advance. Assigned.
- the user terminal can synchronize with the network and identify a cell (for example, cell ID) to which the user terminal is connected.
- system information can be acquired by receiving broadcast channels (PBCH, SIB) after cell search.
- E-UTRA Evolved Universalterrestrial Radio Access
- E-UTRAN Evolved Universalterrestrial 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.
- 5G / NR eMBB (enhanced Mobile Broad Band), IoT (Internet of Things), mMTC (massive Machine Type Communication), M2M (Machine To Machine), URLLC (Ultra Reliable and Low Latency Communications), etc. Provision of communication services is being considered.
- 5G / NR is required to support the use of flexible neurology and frequency and realize a dynamic frame configuration.
- Numerology refers to, for example, communication parameters applied to transmission / reception of a certain signal (for example, subcarrier interval, bandwidth, etc.).
- This invention is made in view of this point, and provides the user terminal and radio
- the user terminal which concerns on 1 aspect of this invention has a receiving part which receives the alerting
- the broadcast channel corresponding to each frequency band is characterized in that at least one of size, resource amount, and notification content is set independently.
- FIGS. 2A and 2B are diagrams illustrating an example of an arrangement of PSS / SSS / PBCH for each frequency band.
- 3A and 3B are diagrams for explaining the number of bits used for SFN notification.
- 4A and 4B are diagrams illustrating an example of an SS block set in an SS burst set. It is a figure which shows an example of the design of NR-PBCH corresponding to a some band group. It is a figure which shows an example of schematic structure of the radio
- the user terminal can detect at least time frequency synchronization and a cell identifier (cell ID) by detecting a synchronization signal.
- the user terminal receives a broadcast channel (for example, PBCH) including system information after acquiring the cell ID in synchronization with the network.
- PBCH broadcast channel
- SIB System Information Block
- PRACH Physical Random Access Channel
- the user terminal receives system information (broadcast information) necessary for downlink communication through an MIB (Master Information Block) transmitted through the broadcast channel (PBCH) or the like.
- the broadcast channel (LTE-PBCH) of the existing LTE system is transmitted by Subframe # 0 in each radio frame at a cycle of 10 msec in a center band of 1.4 MHz (center 6 RBs).
- SIB System Information Block
- PDSCH downlink shared data channel
- the allocation position of the broadcast channel (LTE-PBCH) in the existing LTE system is fixed in the time resource and the frequency resource. In this way, since the LTE-PBCH is transmitted from the radio base station with a fixed resource, it can be received without special notification to the user terminal.
- LTE-PBCH broadcast channel
- a user terminal receives system information (MIB and / or SIB) in initial access processing or the like in order to perform communication using a newly introduced carrier (also referred to as an NR carrier (cell)). It will be necessary.
- SIB system information
- NR carrier cell
- option 1 to option 3 are being studied as a method of transmitting and receiving SIB (remaining minimum system information).
- Option 1 is a method of transmitting SIB by PDSCH as in the existing LTE system. Specifically, after receiving the synchronization signal and the broadcast channel, the user terminal receives PDSCH (SIB) scheduled on the downlink control channel (common search space) (option 1-1). Thereafter, the user terminal controls the random access procedure based on the received system information and the like.
- SIB PDSCH
- the downlink control channel common search space
- the user terminal may specify the PDSCH resource for transmitting the SIB on the PBCH instead of scheduling the PDSCH (SIB) on the downlink control channel (common search space) (option 1-2).
- Option 2 is a method of transmitting the SIB using the newly defined PBCH. Specifically, after receiving the synchronization signal and the broadcast channel, the user terminal receives the SIB through the newly defined broadcast channel (second broadcast channel). Thereafter, the user terminal controls the random access procedure based on the received system information and the like.
- Option 3 is a method in which the PBCH sets initial UL transmission and transmits PDSCH (SIB) as a response to the UL transmission.
- SIB PDSCH
- SS block a signal group including at least a synchronization signal (PSS / SSS) and a broadcast channel (PBCH) is defined as an SS block (SS block), and communication using the SS block is considered. Yes. For example, during multibeam operation, it is assumed that the entire SS burst set composed of a plurality of SS blocks is periodically and repeatedly transmitted.
- PSS / SSS synchronization signal
- PBCH broadcast channel
- the SS (synchronization signal) block will be described with reference to FIG.
- FIG. 1 is a conceptual explanatory diagram of an SS block.
- the SS block refers to a resource (or resource set) including at least PSS (NR-PSS), SSS (NR-SSS), and PBCH (NR-PBCH).
- NR-PSS PSS
- SSS SSS
- PBCH PBCH
- 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).
- PSS and SSS, or PSS (SSS) and PBCH may be time division multiplexed (TDM: Time Division Multiplexing) or frequency division multiplexed (FDM: Frequency Division Multiplexing).
- TDM Time Division Multiplexing
- FDM Frequency Division Multiplexing
- the SS block candidate position may be defined in the specifications for each frequency band, and the SS block index may be recognized by the user terminal from the signal in the SS block.
- the base station may include the SS block index in the NR-PBCH and transmit it to the user terminal. Thereby, UE can grasp
- the user terminal can determine the symbol index and / or the slot index if the SS block index is known.
- the number of bits necessary for SS block index notification can be suppressed.
- PSS / SSS / PBCH corresponding to the same SS block index can be transmitted using the same beam.
- the contents of the system information may be different between different neurology.
- the configuration of the broadcast channel (NR-PBCH) transmitted at 5G / NR (which information is included, etc.) has not been determined. Further, how the user terminal obtains system information (for example, SIB) and accesses the NR cell after detecting the NR-PBCH is not determined.
- a user terminal that has detected a synchronization signal (NR-PSS / NR-SSS) and a broadcast channel (NR-PBCH) may use a downlink control channel that schedules system information (minimum SI). Need to know the resources (search space). In this case, it is conceivable to include information on the region where the downlink control channel is set in the NR-PBCH. It is also conceivable that the SS block index information is included in the NR-PBCH so that the user terminal knows the SS block index.
- the size of the NR-PBCH may become very large.
- the number of bits for notifying the SS block index increases.
- control resource sets that are candidates for downlink control information allocation are widely formed, so that the number of bits for notifying the control resource set increases.
- the present inventors when a plurality of pneumatics are set, at least one of the minimum carrier bandwidth, the maximum carrier bandwidth, and the maximum number of beams is different for each frequency band to be applied (for example, a predetermined band).
- a predetermined band for example, a predetermined band.
- the inventors of the present invention have conceived to set the NR-PBCH configuration (or NR-PBCH design, NR-PBCH parameter) independently (or differently) for each predetermined frequency band.
- At least one of a size (payload size), a resource amount, and a notification content (content) is independently set for a broadcast channel set corresponding to each different frequency band.
- the resource amount corresponds to a resource to which NR-PBCH is allocated, and can be defined by the number of symbols and / or bandwidth.
- At least one of the following information (1) to (6) is transmitted to the user terminal using NR-PBCH. Furthermore, the number of bits of each information may be set to be different for each frequency band.
- the NR-PBCH can be notified to the user terminal including part or all of each information.
- NR-PBCH design NR-PBCH design parameters
- at least one of payload size, resource amount (number of symbols and / or bandwidth), and notification content (content) is set independently (differently) for each frequency band.
- the usable bandwidth becomes wide, but it is also necessary to use a large number of beams by applying multi-beam operation or the like. Therefore, the information included in the NR-PBCH increases relatively. Therefore, in the NR-PBCH corresponding to the high frequency band (for example, NR-PBCH transmitted in the high frequency band), the payload size and / or the resource amount may be set large.
- the available bandwidth may be limited.
- the resource amount may be limited in the NR-PBCH corresponding to the low frequency band (for example, NR-PBCH transmitted in the low frequency band).
- the payload size of NR-PBCH may be set to be small.
- FIG. 2A shows an example of an arrangement method of PSS / SSS / PBCH in frequency band A (for example, low frequency band).
- frequency band A for example, low frequency band
- PSS, SSS, and PBCH are arranged with the same bandwidth
- FIG. 2B shows an example of an arrangement method of PSS / SSS / PBCH in frequency band B (for example, high frequency band).
- frequency band B is located in a higher frequency region than frequency band A.
- the frequency band B compared with the frequency band A, the case where the bandwidth is linearly scaled by setting the subcarrier interval (SCS) wider for the PSS and SSS is shown.
- the subcarrier interval is set wider than that of PSS / SSS, and the number of RBs is increased to expand the resource amount. Thereby, the payload size of PBCH can also be enlarged.
- the second aspect a case will be described in which at least part of information on the system frame number (SFN and / or H-SFN (Hyper-SFN)) is included in the NR-PBCH.
- the number of bits used for notification of information related to the system frame number may be set independently for NR-PBCHs corresponding to different frequencies.
- the SFN value may be repeated 2n times. Thereby, a part of the SFN information can be expressed (notified) implicitly by resetting the scrambling applied to the NR-PBCH transmission data at the head of the repetition.
- an SS burst set period may be set independently for each frequency band.
- the SS burst set period is set to 10 ms (repeated four times) (see FIG. 3A).
- the SS burst set cycle is set to 80 ms (repeated twice) (see FIG. 3B).
- the SS burst set period and the number of repetitions are not limited to this.
- 3A shows a case where 1 beam (one SS block) transmission is performed
- FIG. 3B shows a case where 16 beams (16 SS blocks) transmission is performed.
- the user terminal since the user terminal can determine the detected SFN by grasping the timing at which the 10 ms period and the repetition are switched, the user terminal may notify the SFN using 8 bits instead of 10 bits ( 2 bits are determined implicitly).
- the SFN included in the NR-PBCH for example, # 0- # 3
- the SFN included in the NR-PBCH can be defined by the same 8-bit information. That is, NR-PBCH corresponding to frequency band A (transmitted in frequency band A) can use 8 bits for SFN notification.
- the user terminal since the user terminal can determine the detected SFN by grasping the timing of switching between the cycle of 80 ms and the repetition, the user terminal may notify the SFN using 6 bits instead of 10 bits ( 4 bits are determined implicitly).
- the SFN included in the NR-PBCH repeated twice (for example, the range of # 0 to # 11) can be defined by the same 6-bit information. That is, NR-PBCH corresponding to frequency band B (transmitted in frequency band B) can have 6 bits used for SFN notification.
- the bit information for SFN notification included in the NR-PBCH can be set independently for each frequency band.
- the increase in the overhead of NR-PBCH is suppressed, and communication is appropriately performed using the PBCH suitable for each frequency band. Can be done.
- the third aspect a case will be described in which at least part of the information regarding the SS block index is included in the NR-PBCH.
- the number of bits used for notification of information regarding the SS block index may be set independently for NR-PBCHs corresponding to different frequencies.
- the number of beams to be applied may differ depending on the frequency band. For example, it is assumed that communication is performed with a higher number of beams set in the high frequency band than in the low frequency band.
- the number of SS block indexes varies depending on the number of beams to be applied. That is, when the radio base station notifies the user terminal of information on the SS block index included in the NR-PBCH, the number of SS block indexes to be notified changes for each frequency band.
- the number of bits required for expressing the SS block index is different for each frequency band. Therefore, the number of bits of the SS block index included in the NR-PBCH may be controlled for each frequency band.
- FIG. 4A shows a case where the maximum number of SS blocks in the SS burst set is 4 in frequency band A (for example, low frequency band).
- the number of bits used for notification of the SS block index can be two.
- FIG. 4B shows a case where the maximum number of SS blocks in the SS burst set is 64 in frequency band B (for example, high frequency band).
- the number of bits used for notification of the SS block index can be six.
- the number of bits used for SS block index notification is set to 8. be able to.
- the bit information for SS block index notification included in the NR-PBCH can be set independently.
- an increase in the overhead of the NR-PBCH can be suppressed, and communication can be appropriately performed using the PBCH suitable for each frequency band.
- the fourth aspect a case will be described in which at least part of the information regarding the control resource set is included in the NR-PBCH.
- the number of bits used for reporting information on the control resource set may be set independently for NR-PBCHs corresponding to different frequencies.
- downlink control information for a certain UE is not necessarily assigned to the entire system band and transmitted, but a predetermined frequency region is set to control transmission of the downlink control information.
- the predetermined frequency region set in the UE is a control resource set (CORSET: control resource set), a control resource set, a control subband (control subband), a search space set, a search space resource set, a control region, a control subband, Alternatively, it is also called an NR-PDCCH region or the like.
- the control resource set is configured in units of predetermined resources and can be set to be equal to or less than the system bandwidth (carrier bandwidth).
- the control resource set can be configured with one or a plurality of RBs (PRB and / or VRB) in the frequency direction.
- RB means a frequency resource block unit composed of, for example, 12 subcarriers.
- the UE can control reception by monitoring downlink control information within the range of the control resource set. This eliminates the need for the UE to constantly monitor the entire system bandwidth in the downlink control information reception process, thereby reducing power consumption.
- the bandwidth information and / or frequency position information of the control resource set may be included as information on the control resource set.
- the frequency position information may be an offset from the SS block frequency position.
- the time domain information of the control resource set may be specified in the specification for each frequency band, or a part of the information may be notified using the NR-PBCH bits. For example, it is possible to notify only a part of the candidate time positions of the control resource set defined in the specification.
- control resource set is changed and set according to the applicable frequency band (maximum carrier bandwidth).
- maximum carrier bandwidth the number of candidate frequency positions for arranging the control resource set increases as the broadband carrier increases, so the number of bits required to notify the frequency position may increase. . Therefore, the number of bits of the control resource set included in the NR-PBCH may be controlled for each frequency band.
- a frequency band A for example, a low frequency band in which the maximum carrier bandwidth is set to 100 MHz and an SS bandwidth is set to 10 MHz
- a frequency band B in which the maximum carrier bandwidth is set to 1 GHz and the SS bandwidth is set to 40 MHz.
- a high frequency band is assumed.
- the SS bandwidth corresponds to the bandwidth in which the SS block is arranged.
- the control resource set since the control resource set is considered to be set narrower than the frequency band B in the frequency band A, the number of bits for notifying the bandwidth information of the control resource set can be reduced. Also, the number of bits for notifying the frequency offset information of the control resource set can be reduced.
- the frequency bandwidth B since the control resource set is considered to be set wider than the frequency band A, the number of bits for notifying the bandwidth information of the control resource set can be increased. Also, the number of bits for notifying the frequency offset information of the control resource set can be increased.
- the bit information for control resource set notification included in the NR-PBCH can be set independently.
- an increase in the overhead of the NR-PBCH can be suppressed, and communication can be appropriately performed using the PBCH suitable for each frequency band.
- the fifth aspect a case will be described in which at least one of information on subcarrier spacing, information on cyclic prefix (CP) overhead, and information on the number of antenna ports is included in the NR-PBCH.
- the number of bits used for at least one notification of information on subcarrier spacing, information on CP overhead, and information on the number of antenna ports may be set independently.
- the number of bits used for notification of the user terminal may vary for each frequency band. Therefore, in consideration of the number of bits required for each frequency band, information on the number of subcarrier interval candidates, the number of CP overhead candidates, and the number of antenna port candidates is included in the NR-PBCH and transmitted to the user terminal.
- the user terminal receives at least system information (receives PDSCH scheduled on PDCCH) using subcarrier interval information, CP overhead information, and antenna port number information acquired from NR-PBCH in a predetermined frequency band.
- the newly received instruction is received from the NR-PBCH instruction. You may apply with priority. Thereby, different subcarrier intervals, CP overhead, the number of antenna ports, and the like can be applied for transmission / reception of system information and data communication.
- the information specified by NR-PBCH is applied to some channels / signals such as paging and idle mode measurement.
- the operation may be controlled. Thereby, it is possible to apply different subcarrier intervals, CP overhead, the number of antenna ports, and the like between a signal for paging and measurement for idle mode and a signal during communication.
- a reserved bit for future use may be set in the NR-PBCH.
- the number of reserved bits may be set independently for each frequency band (for example, different values are defined).
- a different value for each frequency band may be set for the number of CRC bits.
- the “frequency band” may be a band corresponding to a predetermined frequency set in advance.
- a band (band number) set in a future wireless communication system may be used, or a band group (band group number) including a plurality of bands may be used.
- at least one of the size, resource, and content of the PBCH corresponding (transmitted) to each band (or band group) is set independently.
- FIG. 5 shows an example of an NR-PBCH design that corresponds (applies) to band group A, band group B, and band group C, respectively.
- band group A corresponds to a frequency band of less than 3.5 GHz
- band group B corresponds to a frequency band of 3.5 GHz or more and less than ⁇ 6 GHz
- band group C corresponds to a frequency band of 6 GHz or more. Shows when to do.
- the number of band groups and the classification method are not limited to this.
- the bit value of each parameter is an example, and is not limited thereto.
- band group A the number of beams when applying beamforming may be smaller than that in band groups B and C, so the number of bits used for SS block index notification can be reduced. Moreover, since it is assumed that the maximum carrier bandwidth is set narrower in the band group A than in the band groups B and C, the number of bits used for notification of the control resource set can be reduced. On the other hand, in the band group C, the number of bits used for SS block index notification and / or the number of bits used for control resource set notification can be defined more than other band groups.
- reserved bits set for future use may be different values between band groups. For example, in the high frequency band (band group C in FIG. 5), since there is a possibility of expansion in the future, more reserved bits may be secured than in other frequency bands.
- different band numbers may be defined for the same frequency band (for example, frequency band A), and the different band numbers may belong to different band groups.
- a user terminal that supports both band numbers may perform PBCH blind detection assuming the PBCH configuration defined for each band group at the time of initial access.
- Wireless communication system Hereinafter, the configuration of a wireless communication system according to an embodiment of the present invention will be described. In this wireless communication system, communication is performed using any one of the above aspects of the present invention or a combination thereof.
- FIG. 6 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
- 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 (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.
- the common control channel that reports the presence or absence of the paging channel is mapped to the downlink L1 / L2 control channel (for example, PDCCH), and the data of the paging channel (PCH) is mapped to the PDSCH.
- a downlink reference signal, an uplink reference signal, and a physical downlink synchronization signal are separately arranged.
- 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) including PDSCH and 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) delivery confirmation 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) is used.
- PUSCH uplink shared channel
- PUCCH Physical Uplink Control Channel
- PRACH Physical Random Access Channel
- User data and higher layer control information are transmitted by PUSCH.
- downlink radio quality information 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 downlink reference signal As a downlink reference signal, a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS), a demodulation reference signal (DMRS) Signal), a positioning reference signal (PRS), etc. are transmitted.
- a measurement reference signal SRS: Sounding Reference Signal
- a demodulation reference signal DMRS
- PRS positioning reference signal
- a measurement reference signal SRS: Sounding Reference Signal
- DMRS demodulation reference signal
- the DMRS may be referred to as a user terminal specific reference signal (UE-specific Reference Signal).
- the transmitted reference signal is not limited to these.
- FIG. 7 is a diagram illustrating an example of an 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: Fast Fourier Transform) processing, inverse discrete Fourier transform (IDFT: INveRSe Discrete Fourier Transform) processing, error correction on user data included in the input upstream signal.
- FFT Fast Fourier Transform
- IDFT inverse discrete Fourier transform
- 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 processing unit 105 performs call processing such as communication channel setting and release, state management of the radio base station 10, and radio resource management.
- 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 is configured to be able to apply both a multi-beam approach and a single beam approach, and includes an analog beam forming unit that provides analog beam forming.
- beam sweeping is applied in which one beam or a plurality of consecutive symbols is used as a unit.
- the beam forming unit may be composed of a beam forming circuit (for example, phase shifter, phase shift circuit) or a beam forming apparatus (for example, phase shifter) described based on common recognition in the technical field according to the present invention. it can.
- the transmission / reception antenna 101 can be configured by an array antenna, for example.
- the transmission / reception unit 103 transmits a synchronization signal (NR-PSS / SSS), a broadcast channel (NR-PBCH), system information (SIB), and the like.
- a synchronization signal NR-PSS / SSS
- NR-PBCH broadcast channel
- SIB system information
- the number of bits used for notification of information related to the system frame number may be independently set for broadcast channels corresponding to (or set and / or transmitted) respectively corresponding to different frequency bands.
- the number of bits used for reporting information related to the synchronization signal block index may be set independently for broadcast channels corresponding to different frequency bands.
- the number of bits used for notification of information related to control resource sets that are transmission candidates for downlink control channels may be set independently for broadcast channels corresponding to different frequency bands.
- the broadcast channels corresponding to the different frequency bands are independently set with the number of bits used to notify at least one of the subcarrier interval, the cyclic prefix (CP) overhead, and the number of antenna ports. Also good.
- FIG. 8 is a diagram illustrating an example of a functional configuration of the radio base station according to the 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 baseband signal processing unit 104 has a digital beamforming function that provides digital beamforming.
- 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, generation of signals (including signals corresponding to synchronization signals, MIBs, paging channels, broadcast channels) by the transmission signal generation unit 302 and signal allocation by the mapping unit 303.
- the control unit 301 performs scheduling (for example, resource allocation) of system information (SIB, MIB, etc.), downlink data signals transmitted on the PDSCH (including PCH of paging messages), downlink control signals transmitted on the PDCCH and / or EPDCCH. , A shared control channel that notifies the presence or absence of a paging message, a signal that notifies a multi-beam approach or a single beam approach).
- 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 transmission signal generation unit 302 Based on an instruction from the control unit 301, the transmission signal generation unit 302 generates a signal for notifying the multi-beam approach or the single beam approach in a common control channel including system information corresponding to MIB or MIB.
- 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 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, for example, receive power (for example, RSRP (Reference Signal Received Power)), reception quality (for example, RSRQ (Reference Signal Received Quality), SINR (Signal to Interference plus Noise Ratio)) or channel of the received signal. You may measure about a state etc.
- the measurement result may be output to the control unit 301.
- FIG. 9 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.
- broadcast information in the downlink data is also 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 by performing retransmission control transmission processing (for example, HARQ transmission processing), channel coding, precoding, discrete Fourier transform (DFT) processing, IFFT processing, and the like. Is transferred to the unit 203.
- 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. can do.
- the transmission / reception antenna 201 can be configured by, for example, an array antenna.
- the transmission / reception unit 203 receives a synchronization signal (NR-PSS / SSS), a broadcast channel (NR-PBCH), system information (SIB), and the like.
- a synchronization signal NR-PSS / SSS
- NR-PBCH broadcast channel
- SIB system information
- FIG. 10 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 and signal allocation by the mapping unit 403.
- the control unit 401 controls signal reception processing by the reception signal processing unit 404 and signal measurement by the measurement unit 405.
- the control unit 401 controls reception of the broadcast channel in each frequency band. For broadcast channels corresponding to different frequency bands, at least one of size, resource amount, and notification content is set independently.
- the number of bits used for notification of information related to the system frame number may be independently set for broadcast channels respectively corresponding to (and set and / or received in) different frequency bands.
- the number of bits used for reporting information related to the synchronization signal block index may be set independently for broadcast channels corresponding to different frequency bands.
- the number of bits used for notification of information related to control resource sets that are transmission candidates for downlink control channels may be set independently for broadcast channels corresponding to different frequency bands.
- the broadcast channels corresponding to the different frequency bands are independently set with the number of bits used to notify at least one of the subcarrier interval, the cyclic prefix (CP) overhead, and the number of antenna ports. Also good.
- the number of bits used for notification of at least one piece of information described here is set (notified) independently from the radio base station 10 to the user terminal 20 for each broadcast channel corresponding to each different frequency band. Also good.
- 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 generator 402 generates an uplink control signal related to delivery confirmation information and channel state information (CSI) based on an instruction from the controller 401, for example.
- the transmission signal generation unit 402 generates an uplink data signal based on an instruction from the control unit 401.
- 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.
- 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 receives a synchronization signal and a broadcast channel transmitted by the radio base station by applying beamforming based on an instruction from the control unit 401.
- a synchronization signal and a broadcast channel assigned to at least one of a plurality of time regions (for example, symbols) constituting a predetermined transmission time interval (for example, subframe or slot) are received.
- 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 broadcast information, system information, RRC signaling, DCI, and the like to the control unit 401, for example.
- the reception signal processing unit 404 outputs the reception signal and the signal after reception processing to the measurement unit 405.
- the measurement unit 405 performs measurement on the received signal.
- the measurement unit 405 performs measurement using the beam forming RS transmitted from the radio base station 10.
- 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 measure, for example, the received power (for example, RSRP), reception quality (for example, RSRQ, received SINR), channel state, and the like of the received signal.
- the measurement result may be output to the control unit 401.
- 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. 11 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.
- predetermined software program
- it is realized by controlling data reading and / or writing 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. to realize frequency division duplex (FDD: Frequency DivisioN Duplex) 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 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).
- OFDM Orthogonal Frequency Division Multiplexing
- SC-FDMA Single Carrier Frequency Division Multiple Access
- the radio frame, subframe, slot, and symbol all represent a time unit when transmitting a signal.
- Different names may be used for the radio frame, the subframe, the slot, and the symbol.
- one subframe may be referred to as a transmission time interval (TTI)
- a plurality of consecutive subframes may be referred to as a TTI
- one slot may be referred to as a TTI.
- the subframe or TTI may be a subframe (1 ms) in the existing LTE, a period shorter than 1 ms (for example, 1-13 symbols), or a period longer than 1 ms. Also good.
- TTI means, for example, a minimum time unit for scheduling in wireless communication.
- a radio base station performs scheduling to allocate 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), or may be a processing unit such as scheduling or link adaptation.
- 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.
- TTI shorter than a normal TTI may be called a shortened TTI, a short TTI, a shortened subframe, a short subframe, or the like.
- 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 one slot, one subframe, or 1 TTI. One TTI and one subframe may each be composed of one or a plurality of resource blocks.
- the RB may be called a physical resource block (PRB: Physical RB), a PRB pair, an RB pair, or the like.
- 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, symbol, and the like is merely an example.
- the configuration such as the cyclic prefix (CP) length 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
- L1 / L2 Layer 1 / Layer 2 control information
- L1 control information L1 control signal
- the RRC signaling may be referred to as an RRC message, and may be, for example, an RRC connection setup message, an RRC connection reconfiguration 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 truth value (Boolean) represented by true or false (false).
- the comparison may be performed by numerical comparison (for example, comparison with a predetermined value).
- software, instructions, information, etc. may be sent and 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
- cell a base station
- cell group a base station
- carrier a base station
- component carrier a base station
- a base station may also be called in terms such as a fixed station, a NodeB, an eNodeB (eNB), an access point, a transmission point, a reception point, a femto cell, and a small cell.
- 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
- a base station may also be called in terms such as a fixed station, a NodeB, an eNodeB (eNB), an access point, a transmission point, a reception point, a femto cell, and a small cell.
- eNB eNodeB
- 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 performed by the base station may be performed by the upper node in some cases.
- various operations performed for communication with a terminal are 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 in this specification 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 trader)
- the present invention may be applied to systems using other appropriate wireless communication methods and / or next-generation systems extended based on these methods.
- 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, “determining” means calculating, computing, processing, deriving, investigating, looking up (eg, table, database or other data) It may be considered to “determine” (search in structure), confirm (Ascertaining), etc.
- “determination (decision)” includes reception (for example, receiving information), transmission (for example, transmitting information), input (Input), output (output), and access (output). Accessing) (e.g., accessing data in memory) or the like may be considered to be “determining”. Also, “determination” is considered to be “determination (resolving)”, “resolving”, “selecting”, “choosing”, “establishing”, “comparing”, etc. Also good. That is, “determination (determination)” may be regarded as “determination (determination)” of some operation.
- the terms “Connected”, “coupled”, or any variation thereof 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.
- 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
- electromagnetic energy such as electromagnetic energy having a wavelength in the region, microwave region, and light (both visible and invisible) region, it can be considered to be “connected” or “coupled” to each other.
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Abstract
Description
オプション1では、既存のLTEシステムと同様にSIBをPDSCHで送信する方法である。具体的には、ユーザ端末は、同期信号、報知チャネルを受信した後、下り制御チャネル(共通サーチスペース)でスケジューリングされるPDSCH(SIB)を受信する(オプション1-1)。その後、ユーザ端末は、受信したシステム情報等に基づいてランダムアクセス手順を制御する。
オプション2では、SIBを新たに定義したPBCHで送信する方法である。具体的には、ユーザ端末は、同期信号、報知チャネルを受信した後、新たに定義された報知チャネル(第2の報知チャネル)でSIBを受信する。その後、ユーザ端末は、受信したシステム情報等に基づいてランダムアクセス手順を制御する。
オプション3では、PBCHが初期のUL送信を設定し、当該UL送信に対する応答(response)でPDSCH(SIB)を送信する方法である。
また、5G/NRでは、同期信号(PSS/SSS)及び報知チャネル(PBCH)を少なくとも含む信号群をSSブロック(SS block)と定義し、SSブロックを利用して通信を行うことが検討されている。例えば、マルチビーム運用時等は、複数のSSブロックから構成されるSSバーストセット全体を周期的に繰り返し送信することが想定されている。
(1)システムフレーム番号(SFN及び/又はH-SFN)に関する情報
(2)SSブロックインデックスに関する情報
(3)コントロールリソースセットに関する情報(少なくとも周波数リソース位置情報)
(4)サブキャリア間隔(Subcarrier spacing)に関する情報
(5)サイクリックプレフィックス(CP)オーバヘッドに関する情報
(6)アンテナポート数に関する情報
第1の態様では、周波数帯毎に異なるNR-PBCHデザインパラメータ(NR-PBCHデザイン)を規定する場合を説明する。例えば、周波数帯毎に、ペイロードサイズ、リソース量(シンボル数及び/又は帯域幅)、通知内容(コンテンツ)の少なくとも一つを独立して(異なって)設定する。
第2の態様では、NR-PBCHにシステムフレーム番号(SFN及び/又はH-SFN(Hyper-SFN))に関する情報の少なくとも一部を含める場合を説明する。また、異なる周波数に対応するNR-PBCHに対して、システムフレーム番号に関する情報の通知に利用するビット数をそれぞれ独立に設定してもよい。
第3の態様では、NR-PBCHにSSブロックインデックスに関する情報の少なくとも一部を含める場合を説明する。また、異なる周波数に対応するNR-PBCHに対して、SSブロックインデックスに関する情報の通知に利用するビット数をそれぞれ独立に設定してもよい。
第4の態様では、NR-PBCHにコントロールリソースセットに関する情報の少なくとも一部を含める場合を説明する。また、異なる周波数に対応するNR-PBCHに対して、コントロールリソースセットに関する情報の通知に利用するビット数をそれぞれ独立に設定してもよい。
第5の態様では、サブキャリア間隔に関する情報、サイクリックプレフィックス(CP)オーバヘッドに関する情報、アンテナポート数に関する情報の少なくともいずれかをNR-PBCHに含める場合を説明する。また、異なる周波数に対応するNR-PBCHに対して、サブキャリア間隔に関する情報、CPオーバヘッドに関する情報、アンテナポート数に関する情報の少なくとも一つの通知に利用するビット数をそれぞれ独立に設定してもよい。
なお、上記説明において「周波数帯域」は、あらかじめ設定された所定の周波数に対応する帯域であればよい。例えば、将来の無線通信システムにおいて設定されるバンド(バンド番号)でもよいし、複数のバンドを含むバンドグループ(バンドグループ番号)でもよい。例えば、各バンド(又はバンドグループ)にそれぞれ対応する(送信される)PBCHのサイズ、リソース及び内容の少なくとも一つを独立に設定する。
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、本発明の上記各態様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7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9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)
- 所定の周波数帯域毎に設定される報知チャネルを受信する受信部と、
各周波数帯域における前記報知チャネルの受信を制御する制御部と、を有し、
異なる周波数帯域にそれぞれ対応する報知チャネルは、サイズ、リソース量、及び通知内容の少なくとも一つが独立に設定されることを特徴とするユーザ端末。 - 前記異なる周波数帯域にそれぞれ対応する報知チャネルは、システムフレーム番号に関する情報の通知に利用するビット数が独立に設定されることを特徴とする請求項1に記載のユーザ端末。
- 前記異なる周波数帯域にそれぞれ対応する報知チャネルは、同期信号ブロックインデックスに関する情報の通知に利用するビット数が独立に設定されることを特徴とする請求項1又は請求項2に記載のユーザ端末。
- 前記異なる周波数帯域にそれぞれ対応する報知チャネルは、下り制御チャネルの送信候補となるコントロールリソースセットに関する情報の通知に利用するビット数が独立に設定されることを特徴とする請求項1から請求項3のいずれかに記載のユーザ端末。
- 前記異なる周波数帯域にそれぞれ対応する報知チャネルは、サブキャリア間隔、サイクリックプレフィクス(CP)のオーバヘッド、及びアンテナポート数の少なくとも一つに関する情報の通知に利用するビット数が独立に設定されることを特徴とする請求項1から請求項4のいずれかに記載のユーザ端末。
- ユーザ端末の無線通信方法であって、
所定の周波数帯域毎に設定される報知チャネルを受信する工程と、
各周波数帯域における前記報知チャネルの受信を制御する工程と、を有し、
異なる周波数帯域にそれぞれ対応する報知チャネルは、サイズ、リソース量、及び通知内容の少なくとも一つが独立に設定されることを特徴とする無線通信方法。
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"Discussion on broadcast signal/channel design for NR", 3GPP TSG RAN WG1 ADHOC_NR_AH_1701 RL-1700611, 20 January 2017 (2017-01-20), XP051208138 * |
"Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall Description; Stage 2", 3GPP TS 36.300 |
NOKIA ET AL.: "On minimum system information", 3GPP TSG RAN WG2 ADHOC_2017_01_NR R2-1700506, 19 January 2017 (2017-01-19), XP051211078 * |
SAMSUNG: "System information delivery", 3GPP TSG RAN WG1 ADHOC_NR_AH_1701 RL-1700888, 20 January 2017 (2017-01-20), XP051208404 * |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2020519119A (ja) * | 2017-05-04 | 2020-06-25 | クゥアルコム・インコーポレイテッドQualcomm Incorporated | 異なるモードでのdmrs/pbchを通じたタイミングインジケーション |
JP7094985B2 (ja) | 2017-05-04 | 2022-07-04 | クゥアルコム・インコーポレイテッド | 異なるモードでのdmrs/pbchを通じたタイミングインジケーション |
JPWO2020065885A1 (ja) * | 2018-09-27 | 2021-08-30 | 株式会社Nttドコモ | 端末、無線通信方法及び無線通信システム |
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US20220078749A1 (en) | 2022-03-10 |
US11832278B2 (en) | 2023-11-28 |
US11304179B2 (en) | 2022-04-12 |
JP6802296B2 (ja) | 2020-12-16 |
CA3052401A1 (en) | 2018-08-09 |
JPWO2018143399A1 (ja) | 2019-12-26 |
EP3579636A4 (en) | 2021-04-07 |
JP2021048610A (ja) | 2021-03-25 |
CN110249680B (zh) | 2023-09-26 |
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CN110249680A (zh) | 2019-09-17 |
BR112019015970A2 (pt) | 2020-03-24 |
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