WO2018220854A1 - ユーザ端末及び無線通信方法 - Google Patents
ユーザ端末及び無線通信方法 Download PDFInfo
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- WO2018220854A1 WO2018220854A1 PCT/JP2017/020700 JP2017020700W WO2018220854A1 WO 2018220854 A1 WO2018220854 A1 WO 2018220854A1 JP 2017020700 W JP2017020700 W JP 2017020700W WO 2018220854 A1 WO2018220854 A1 WO 2018220854A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
- H04L27/261—Details of reference signals
- H04L27/2613—Structure of the reference signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/02—Channels characterised by the type of signal
- H04L5/06—Channels characterised by the type of signal the signals being represented by different frequencies
- H04L5/10—Channels characterised by the type of signal the signals being represented by different frequencies with dynamo-electric generation of carriers; with mechanical filters or demodulators
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/16—Discovering, processing access restriction or access information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/001—Synchronization between nodes
- H04W56/0015—Synchronization between nodes one node acting as a reference for the others
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
Definitions
- the user terminal which concerns on 1 aspect of this invention is the same as the said alerting
- a control unit that determines time information of the synchronization signal block based on a demodulation reference signal arranged in the time domain, wherein the synchronization signal block includes at least three time domains including a continuous time domain Including broadcast channels arranged respectively.
- 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).
- NR-PSS / SSS and NR-PBCH may be arranged (mapped) in different frequency regions (or frequency bands). For example, NR-PSS / SSS is mapped to a first frequency domain (eg, 127 series (or 127 subcarriers)), and NR-PBCH is mapped to a second frequency domain (eg, 288) wider than the first frequency domain. (Refer to FIG. 1).
- a first frequency domain eg, 127 series (or 127 subcarriers)
- NR-PBCH is mapped to a second frequency domain (eg, 288) wider than the first frequency domain.
- the base station may notify the UE of time information (eg, SS block index) of the SS block using a reference signal (eg, DMRS) arranged in the same symbol as NR-PBCH and / or NR-PBCH. .
- the UE can grasp the time index of the received SS block by receiving the NR-PBCH and the like included in the SS block.
- a set of one or more SS blocks may be referred to as an SS burst.
- 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 (which may be referred to as an SS burst period). Or SS burst does not need to be transmitted for every period (it may transmit in a non-period).
- the SS block index notification method to the user terminal there are an implicit notification method using a signal sequence or the like, and an explicit notification method included in the NR-PBCH or the like. Conceivable.
- the method of notifying implicitly if the number of indexes to be notified increases (for example, 64 types), processing such as signal design and signal sequence determination becomes complicated, which may increase the communication load.
- the SS block configuration includes one NR-PSS, one NR-SSS, and three NR-PBCHs arranged in different time domains (for example, symbols). An example will be described. Further, a configuration is assumed in which a demodulation reference signal (DMRS) is arranged in the time domain in which NR-PBCH is arranged.
- DMRS demodulation reference signal
- PBCH2 is arranged adjacent to SSS and PBCH3. Therefore, when the user terminal performs PBCH2 reception processing, DMRS3 mapped to the same symbol as SSS and / or PBCH3 may be used in addition to DMRS2 mapped to the same symbol as PBCH2. Thereby, it is possible to improve the channel estimation accuracy of PBCH2 and appropriately receive PBCH2.
- the arrangement pattern and / or arrangement density of DMRS1 and DMRS2 are set to be the same, and the arrangement pattern and / or arrangement density of DMRS3 are set to be different from those of DMRS1 and DMRS2.
- the arrangement density of DMRS1 and DMRS2 is made smaller than the arrangement density of DMRS3 (see FIG. 3B).
- PBCH1 may perform channel estimation using DMRS1 and SSS (and / or PSS)
- PBCH2 may perform channel estimation using DMRS2 and SSS (and / or DMRS3).
- the arrangement pattern of DMRS1 and DMRS2 may be different (for example, a configuration shifted in the frequency direction) (see FIG. 3C).
- the user terminal may average DMRS2 and DMRS3 and use them in the channel estimation of PBCH2 (and / or PBCH3).
- the DMRS (and / or synchronization signal) of another symbol may be used for channel estimation. . This is because, when the moving speed of the user terminal is fast, channel estimation accuracy may be deteriorated if DMRS or the like of another symbol is used.
- FIG. 4A shows an example (option 2) of the SS block configuration.
- the synchronization signal and the broadcast channel are arranged in different symbols in the order of PSS / PBCH1 / PBCH2 / SSS / PBCH3.
- the time information of SS block configuration 2 may be included in all of PBCH1, PBCH2 and PBCH3, or included in a part of PBCH (for example, PBCH1 and PBCH2, PBCH2 and PBCH3, only PBCH1, only PBCH2 or only PBCH3). Also good.
- the synchronization signal (for example, PSS) may be used as a phase reference for PBCH.
- PBCH1 is arranged adjacent to PSS and PBCH2. Therefore, when a user terminal performs PBCH1 reception processing (for example, channel estimation), in addition to DMRS1 mapped to the same symbol as PBCH1, DMRS2 mapped to the same symbol as PSS and / or PBCH2 is used. May be. Thereby, it is possible to improve the channel estimation accuracy of PBCH1 and appropriately receive PBCH1 (for example, improve the reception success rate).
- PBCH1 reception processing for example, channel estimation
- DMRS1 mapped to the same symbol as PBCH1, DMRS2 mapped to the same symbol as PBCH2, and DMRS3 mapped to the same symbol as PBCH3 may have the same configuration or different configurations. In the case of a different configuration, the arrangement pattern and / or arrangement density of some DMRSs of DMRS 1 to 3 may be arranged different from other DMRSs.
- the arrangement pattern of DMRS2 and DMRS3 may be different (for example, a configuration shifted in the frequency direction) (see FIG. 4C).
- the user terminal may average and use DMRS1 and DMRS2 in the channel estimation of PBCH2 (and / or PBCH1).
- a DMRS (DMRS 2 and 3 in FIG. 4) is arranged in a symbol adjacent to a synchronization signal (for example, PSS and / or SSS), a frequency region in which the synchronization signal is arranged and a frequency region that does not overlap with the synchronization signal
- a synchronization signal for example, PSS and / or SSS
- Different DMRS patterns and / or DMRS densities may be applied.
- the DMRS density in the frequency domain overlapping with the synchronization signal is selectively made smaller than the DMRS density in the frequency domain not overlapping with the synchronization signal (see FIGS. 4B and 4C). Accordingly, it is possible to suppress degradation of channel estimation accuracy by using the synchronization signal and increase resources used for the broadcast channel.
- PBCH1 is arranged adjacent to PSS. Therefore, when the user terminal performs a PBCH1 reception process (for example, channel estimation), PSS may be used in addition to DMRS1 mapped to the same symbol as PBCH1. Also, the arrangement density of DMRS1 may be set higher than the DMRS arrangement density of other symbols. Thereby, it is possible to improve the channel estimation accuracy of PBCH1 and appropriately receive PBCH1 (for example, improve the reception success rate).
- PBCH3 is arranged adjacent to SSS. Therefore, when the user terminal performs the PBCH3 reception process, SSS may be used in addition to DMRS3 mapped to the same symbol as the PBCH3. Thereby, it is possible to improve the channel estimation accuracy of PBCH3 and appropriately receive PBCH3.
- the arrangement pattern of DMRS2 and DMRS3 may be different (for example, a configuration shifted in the frequency direction) (see FIG. 5C).
- DMRS density may be applied.
- the DMRS density in the frequency domain overlapping with the synchronization signal is selectively made smaller than the DMRS density in the frequency domain not overlapping with the synchronization signal (see FIGS. 5B and 5C). Accordingly, it is possible to suppress degradation of channel estimation accuracy by using the synchronization signal and increase resources used for the broadcast channel.
- the predetermined value is 6 GHz>
- an SS block is composed of four consecutive symbols.
- the maximum number of SS blocks in the SS burst set is set to 4 or 8, for example. For this reason, the number of bits of time information (for example, SS block index) of the SS block notified to the user terminal can be reduced. Therefore, even when notifying time information using PBCH, the capacity of two PBCHs can be sufficiently covered.
- the SS block time information notification method may be different depending on the frequency band. For example, when the frequency band is equal to or lower than a predetermined value (0-3 GHz), an implicit notification is applied as a method of notifying time information of the SS block. When the frequency band is larger than a predetermined value (3-52.6 GHz), only the explicit notification or the combination of the explicit notification and the implicit notification is applied as the SS block time information notification method.
- a predetermined value 3-52.6 GHz
- PBCH resources bits
- the predetermined DMRS arranged in the predetermined symbol may be different from the DMRS arranged in another symbol.
- at least one of a predetermined DMRS sequence, arrangement pattern, and arrangement density used for notification of time information is configured differently from other DMRS.
- the configuration of another DMRS is determined based on a predetermined condition (for example, a cell ID), and is determined based on time information that notifies the configuration of the predetermined DMRS.
- the user terminal controls reception of other DMRSs based on the cell ID or the like, and grasps SS block time information based on the configuration of the predetermined DMRS.
- 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. 8 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
- 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.
- the baseband signal processing unit 104 performs fast Fourier transform (FFT) processing, inverse discrete Fourier transform (IDFT: Inverse Discrete Fourier Transform) processing, and 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 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 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 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 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.
- 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
- the processor 1001 performs computation and communication by the communication device 1004. This is realized by controlling data reading and / or writing in the memory 1002 and the storage 1003.
- 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 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)
- TTI transmission time interval
- a plurality of consecutive subframes may be referred to as a TTI
- one slot may be referred to as a TTI.
- the subframe and / or TTI may be a subframe (1 ms) in the existing LTE, a period shorter than 1 ms (eg, 1-13 symbols), or a period longer than 1 ms. There may be.
- 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 and / or transmission power 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 and / or link adaptation.
- 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 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).
- 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.
- 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.
- 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.
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Abstract
Description
5G/NRでは、同期信号(例えば、NR-PSS及び/又はNR-SSS(以下、NR-PSS/SSSとも記す))と報知チャネル(例えば、NR-PBCH)を少なくとも含むリソースユニットを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。
第1の態様では、連続する所定数の時間領域(例えば、5シンボル)で構成されるSSブロック構成について説明する。なお、以下の説明では、SSブロック構成が、異なる時間領域(例えば、シンボル)に配置される1個のNR-PSSと、1個のNR-SSSと、3個のNR-PBCHを含む場合を例に挙げて説明する。また、NR-PBCHが配置される時間領域には、復調用参照信号(DMRS)が配置される構成を想定する。
図3Aは、SSブロック構成の一例(オプション1)を示している。SSブロック構成1では、同期信号と報知チャネルを、PSS/PBCH1/SSS/PBCH2/PBCH3の順番に異なるシンボルに配置する。SSブロック構成1の時間情報(例えば、SSブロックインデックス)は、PBCH1、PBCH2及びPBCH3の全てに含めてもよいし、一部のPBCH(例えば、PBCH1とPBCH2、PBCH2とPBCH3、PBCH1のみ、PBCH2のみ、又はPBCH3のみ)に含めてもよい。同期信号(例えば、PSS)は、PBCHの位相基準として利用してもよい。
図4Aは、SSブロック構成の一例(オプション2)を示している。SSブロック構成2では、同期信号と報知チャネルを、PSS/PBCH1/PBCH2/SSS/PBCH3の順番に異なるシンボルに配置する。SSブロック構成2の時間情報は、PBCH1、PBCH2及びPBCH3の全てに含めてもよいし、一部のPBCH(例えば、PBCH1とPBCH2、PBCH2とPBCH3、PBCH1のみ、PBCH2のみ又はPBCH3のみ)に含めてもよい。同期信号(例えば、PSS)は、PBCHの位相基準として利用してもよい。
図5Aは、SSブロック構成の一例(オプション3)を示している。SSブロック構成3では、同期信号と報知チャネルを、PBCH1/PSS/PBCH2/SSS/PBCH3の順番に異なるシンボルに配置する。SSブロック構成3の時間情報(例えば、SSブロックインデックス)は、PBCH1、PBCH2及びPBCH3の全てに含めてもよいし、一部のPBCH(例えば、PBCH1のみ、PBCH2のみ、又はPBCH3のみ)に含めてもよい。同期信号(例えば、PSS)は、PBCHの位相基準として利用してもよい。
第2の態様では、周波数帯域(周波数レンジ)毎にSSブロック構成を独立に設定する場合について説明する。以下の説明では、SSブロック構成に含まれるシンボル数(例えば、PBCH数)を周波数レンジに応じて異なる構成とする場合を説明する。
0-6GHzの周波数帯域では、連続する4シンボルでSSブロックを構成する。0-6GHzの周波数帯域では、SSバーストセット内のSSブロックの最大数が、例えば4又は8に設定される。このため、ユーザ端末に通知するSSブロックの時間情報(例えば、SSブロックインデックス)のビット数を少なくすることができる。そのため、PBCHを利用して時間情報を通知する場合であっても、2個のPBCHの容量で十分にカバーすることができる。
0-3GHzの周波数帯域では、連続する4シンボルでSSブロックを構成する。0-3GHzの周波数帯域では、SSバーストセット内のSSブロックの最大数が、例えば4に設定される。このため、ユーザ端末に通知するSSブロックの時間情報のビット数を少なくすることができる。そのため、PBCHを利用して時間情報を通知する場合であっても、2個のPBCHの容量で十分にカバーすることができる。
第3の態様では、SSブロックを配置する位置(候補位置)を設定する場合について説明する。
第4の態様では、SSブロックにおいて、PBCHが配置される複数シンボル(PBCHシンボル)のうち一部のシンボルを利用してSSブロックの時間情報を通知する場合について説明する。
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9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11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)
- 異なる時間領域に配置される複数の同期信号及び複数の報知チャネルを含む同期信号ブロックを受信する受信部と、
前記報知チャネル及び/又は前記報知チャネルと同じ時間領域に配置される復調用参照信号に基づいて前記同期信号ブロックの時間情報を決定する制御部と、を有し、
前記同期信号ブロックは、少なくとも連続する時間領域を含む3個以上の時間領域にそれぞれ配置される報知チャネルを含むことを特徴とするユーザ端末。 - 報知チャネルが連続して配置される時間領域にそれぞれ配置される復調用参照信号の配置パターン及び/又は配置密度が異なる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3個以上の時間領域に配置される報知チャネルを有する同期信号ブロックを所定の周波数帯域以上で受信す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。
- 前記制御部は、前記同期信号ブロックに含まれる複数の報知チャネルのうち特定の時間領域に配置された報知チャネルに基づいて前記同期信号ブロックの時間情報を決定す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。
- 前記制御部は、前記複数の同期信号と同じ周波数領域に配置される報知チャネル及び/又は復調用参照信号に基づいて前記同期信号ブロックの時間情報を取得す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、
異なる時間領域に配置される複数の同期信号及び複数の報知チャネルを含む同期信号ブロックを受信する工程と、
前記報知チャネル及び/又は前記報知チャネルと同じ時間領域に配置される復調用参照信号に基づいて前記同期信号ブロックの時間情報を決定する工程と、を有し、
前記同期信号ブロックは、少なくとも連続する時間領域を含む3個以上の時間領域にそれぞれ配置される報知チャネルを含むことを特徴とする無線通信方法。
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