WO2018062455A1 - 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 or 12
- LTE has been specified for the purpose of further widening and speeding up from LTE (also referred to as LTE Rel. 8 or 9), and LTE.
- Successor systems for example, FRA (Future Radio Access), 5G (5th generation mobile communication system), NR (New Radio), NX (New radio access), FX (Future generation radio access), LTE Rel. 13, 14 or Also referred to as after 15).
- CA Carrier Aggregation
- CC Component Carrier
- UE User Equipment
- DC dual connectivity
- CG Cell Group
- CC cell
- Inter-eNB CA inter-base station CA
- LTE Rel. frequency division duplex (FDD) in which downlink (DL) transmission and uplink (UL: Uplink) transmission are performed in different frequency bands, and downlink transmission and uplink transmission are in the same frequency band.
- Time Division Duplex (TDD) which is performed by switching over time, is introduced.
- Future wireless communication systems for example, 5G, NR will realize various wireless communication services to meet different requirements (for example, ultra-high speed, large capacity, high reliability, ultra-low delay, etc.) Is expected.
- NR is considering the provision of wireless communication services called eMBB (enhanced Mobile Broad Band), mMTC (massive Machine Type Communication), URLLC (Ultra Reliable and Low Latency Communications), and the like.
- eMBB enhanced Mobile Broad Band
- mMTC massive Machine Type Communication
- URLLC Ultra Reliable and Low Latency Communications
- a common search space (CSS: Common Search Space) made up of certain predetermined radio resources is used to transmit common information to UEs.
- CSS Common Search Space
- if fixed resources are used for CSS there is a possibility that appropriate communication cannot be performed. In this case, problems such as a decrease in communication throughput and an increase in power consumption of the UE occur.
- the present invention has been made in view of the above points, and an object of the present invention is to provide a user terminal and a wireless communication method capable of communicating using an appropriate CSS in a future wireless communication system.
- a user terminal includes: a control unit that determines a resource of a predetermined common search space based on information on a resource amount of the common search space; and at least a part of the resource of the predetermined common search space And a receiving unit that monitors the downlink control channel.
- communication can be performed using an appropriate CSS even in a future wireless communication system.
- 1A and 1B are diagrams illustrating an example of BF operation assumed in NR.
- 2A and 2B are diagrams illustrating an example of a problem that occurs in relation to the CSS resource amount.
- 3A and 3B are diagrams illustrating an example of setting a CSS resource amount according to the first embodiment. It is a figure which shows an example of the setting of the restriction
- BF beam forming
- Precoding is a method for performing an appropriate phase and / or amplitude adjustment on a transmission signal.
- the transmission side can improve reception quality by applying an appropriate weight (precoding weight) to the transmission signal based on the propagation path information notified from the reception side.
- BF is a technique for forming a beam (antenna directivity) by controlling the amplitude and / or phase of a signal transmitted / received from each element using, for example, a super multi-element antenna.
- MIMO Multiple Input Multiple Output
- large-scale MIMO Massive MIMO
- Digital BF can be classified into digital BF and analog BF.
- Digital BF is a method of performing precoding signal processing (for a digital signal) on baseband.
- IFFT Inverse Fast Fourier Transform
- DAC Digital to Analog Converter
- RF Radio Frequency
- IFFT Inverse Fast Fourier Transform
- DAC Digital to Analog Converter
- RF Radio Frequency
- Analog BF is a method using a phase shifter on RF. In this case, since only the phase of the RF signal is rotated, the configuration is easy and can be realized at low cost, but a plurality of beams cannot be formed at the same timing.
- a hybrid BF configuration combining a digital BF and an analog BF can also be realized.
- future wireless communication systems for example, NR
- introduction of large-scale MIMO is being studied.
- the circuit configuration becomes expensive. For this reason, it is assumed that a hybrid BF configuration is used in NR.
- FIG. 1 is a diagram illustrating an example of BF operation assumed in NR.
- three UEs receive random access (RA: Random Access) signals (for example, RA preamble, RACH (RA Channel) preamble, PRACH) as uplink signals to the base station.
- RA Random Access
- RACH RA Channel
- PRACH Physical Random Access
- An example of transmitting (Physical RACH) preamble, also called simply preamble) is shown.
- gNB next generation core network
- FIG. 1A shows an example of single BF (single BF) operation in which a base station uses one beam.
- Single BF operation is an operation method similar to existing LTE.
- the base station can receive a signal transmitted toward a reception range (an elliptical area indicated by a solid line) by one beam.
- the elliptical region may be assumed to correspond to one cell (CC).
- FIG. 1B shows an example of multiple BF operation in which the base station uses a plurality of beams.
- BF can be used to suppress signal collision.
- the base station sweeps (shifts and switches with time) the received beam (the elliptical area indicated by the solid line).
- three receive beams with different directions are swept.
- the UEs # 1 to # 3 transmit the same preamble using different time resources, and the base station can distinguish the received preamble from each UE.
- the flow of initial access in NR is assumed to be as follows, for example.
- the UE searches for a synchronization signal (PSS (Primary Synchronization Signal), SSS (Secondary Synchronization Signal), etc.) on a predetermined synchronization signal raster.
- PSS Primary Synchronization Signal
- SSS Secondary Synchronization Signal
- the synchronization signal raster indicates, for example, a frequency resource set so that the synchronization signal can be mapped at a predetermined frequency interval, and may be defined in the specification.
- the UE After detecting one or a plurality of synchronization signals, the UE reads a broadcast channel (PBCH: Physical Broadcast Channel) and recognizes a cell.
- PBCH Physical Broadcast Channel
- the UE receives system information (SIB: System Information Block) and acquires information necessary for cell communication.
- SIB System Information Block
- the resource used for SIB transmission may be notified by PBCH, or may be dynamically scheduled by downlink control information (for example, DCI (Downlink Control Information)).
- DCI Downlink Control Information
- the UE starts the RA procedure, for example, selects one of a plurality of RA preambles specified by the PRACH configuration information randomly or according to a predetermined rule, and transmits the selected RA preamble using the PRACH (message 1).
- the base station may set the RA preamble resource for the UE by broadcast information (MIB (Master Information Block), SIB, etc.).
- MIB Master Information Block
- SIB Service Information Block
- RA Random access response
- messages are transmitted and received multiple times between the base station and the UE. For example, when detecting the RA preamble, the base station transmits a random access response (RAR) as a response (message 2).
- RAR random access response
- the UE that has received the RAR adjusts the UL transmission timing based on the timing advance (TA) included in the RAR, and establishes UL synchronization.
- the UE transmits a control message of a higher layer (L2 / L3: Layer 2 / Layer 3) using UL resources specified by the UL grant included in the RAR (message 3).
- the control message includes a UE identifier (UE-ID).
- the UE identifier may be, for example, C-RNTI (Cell-Radio Network Temporary Identifier) in the RRC connection state, or S-TMSI (System Architecture Evolution-Temporary Mobile Subscriber Identity) in the idle state. It may be an upper layer UE-ID.
- the base station transmits a collision resolution message (contention resolution) according to the control message of the higher layer (message 4).
- the collision resolution message is transmitted based on the UE identifier included in the control message.
- the UE that has successfully detected the collision resolution message transmits an acknowledgment (ACK: Acknowledge) in HARQ (Hybrid Automatic Repeat reQuest) to the radio base station.
- ACK Acknowledge
- HARQ Hybrid Automatic Repeat reQuest
- the RA procedure may be performed when the RRC connection state is established but UL synchronization is not established (for example, when UL transmission is started or resumed).
- the UE monitors a common search space (CSS: Common Search Space) of a predetermined downlink control channel and receives downlink control information (for example, DCI).
- CCS Common Search Space
- monitoring refers to, for example, trying to decode each downlink control channel for a target DCI format with a set of a predetermined number of downlink control channel candidates.
- decoding is also called blind decoding (BD) and blind detection.
- Downlink control channel candidates are also called BD candidates, PDCCH (Physical Downlink Control Channel) candidates, EPDCCH (Enhanced PDCCH) candidates, and the like.
- Search space indicates a set of downlink control channel candidates to be monitored.
- a plurality of aggregation levels may be defined in the SS.
- AL corresponds to the number of control channel elements (CCE: Control Channel Element) / enhanced control channel elements (ECCE: Enhanced CCE) constituting DCI.
- CCE Control Channel Element
- ECCE enhanced CCE
- the SS may be configured to have a plurality of downlink control channel candidates for a certain AL.
- the CSS may be a cell-specific (common to all UEs in the cell) search space, or may be a search space common to a plurality of specific UEs (for example, a predetermined UE group).
- the predetermined downlink control channel may be at least one of, for example, PDCCH, EPDCCH, MPDCCH (MTC PDCCH), NB-PDCCH (Narrow Band PDCCH), or a control channel newly defined for NR It may be.
- the UE may receive the downlink control information for scheduling at least one of message 2 (RAR), retransmission of message 3, and message 4 by CSS.
- RAR message 2
- message 4 message 4 by CSS.
- the UE may receive downlink control information for a paging message (paging information), system information, an uplink transmission power control (TPC: Transmit Power Control) command, and the like by CSS.
- paging information paging information
- system information system information
- TPC Transmit Power Control
- Information regarding the location of CSS resources (hereinafter also simply referred to as CSS resources, CSS resources, etc.) is preferably notified (set) to the UE by broadcasting.
- the information regarding the CSS resource position may be transmitted by SIB or may be transmitted by MIB (PBCH).
- FIG. 2 is a diagram illustrating an example of a problem that occurs in relation to the CSS resource amount.
- FIG. 2 shows CSS resources occupying a predetermined time and frequency resource.
- the CSS time resource may be one or more subframes, one or more symbols, and the like.
- the CSS frequency resource may be one or more resource blocks, one or more subbands, one or more subcarriers, and the like.
- FIG. 2A shows an example where the amount of CSS resources is small.
- the amount of information that can be transmitted by the CSS is small, there is a risk that the CSS will run out of capacity.
- the base station cannot transmit information to be transmitted by CSS at a certain timing, there is a possibility that communication throughput and frequency use efficiency may be decreased.
- FIG. 2B shows an example where the amount of CSS resources is large.
- the CSS resource amount is large, the UE processing amount necessary for blind decoding of downlink control information increases. As a result, the power consumption of the UE may increase.
- the present inventors have found that in NR, it is preferable to define a flexible CSS in consideration of the traffic volume, pneumatics, etc. of the base station and / or UE.
- Numerology means frequency domain and / or time domain communication parameters (eg, subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix (CP) length, transmission time).
- Interval Transmission Time Interval
- number of symbols per TTI radio frame configuration, filtering process, windowing process, etc.
- the present inventors have conceived to variably set the CSS resource amount by broadcast information.
- the base station can change the CSS resource amount in accordance with the traffic amount.
- the CSS resource amount is variably set using broadcast. Specifically, the time and / or frequency resource amount for the downlink control channel using CSS is made variable.
- information regarding the CSS resource amount may be included in broadcast information (for example, MIB and / or SIB) and notified to the UE.
- the UE determines the CSS resource amount to be monitored based on the notified CSS resource amount information.
- the UE may determine (specify) a CSS resource (PDCCH set, CCE index, etc.) based on the CSS resource amount and the CSS resource position.
- the base station may control the increase or decrease of the CSS resource amount according to the traffic volume of the cell (for example, it may be determined by the number of UEs connected to the base station).
- the base station may determine the CSS resource amount in consideration of the traffic amount, channel state, moving speed, location, applied neurology, and the like of each UE.
- the CSS resource amount information may be at least one of the number of RBs, the number of subcarriers, the ratio of CSS frequency resources in the system bandwidth, and the like. Further, the CSS resource amount information may be information indicating a difference from the current resource amount of CSS, or information indicating changes in the resource amount (for example, “increase”, “maintain”, “decrease”). There may be.
- FIG. 3 is a diagram illustrating an example of setting a CSS resource amount according to the first embodiment.
- the CSS resource amount is changed between time t 1 and t 2 and the changed resource amount is set using broadcast, but the setting method is not limited to this example.
- FIG. 3A shows an example in which the CSS resource amount increases.
- UE is during the period from the time t 1 to t 2, 1 consecutive frequency resources is set to be a resource of CSS.
- the base station may set a plurality of downlink control channels using the same CSS.
- a plurality of downlink control channels (for example, PDCCH sets) using the same CSS may be configured with the same time resource and different frequency resources (may be frequency division multiplexing (FDM)) It may be configured with the same frequency resource and different time resources (time division multiplexing (TDM) may be performed), or both frequency and time resources may be configured differently (FDM and TDM). May be).
- FDM frequency division multiplexing
- TDM time division multiplexing
- FIG. 3B shows another example in which the CSS resource amount increases.
- the UE is configured that a plurality (two) of non-continuous frequency resources are CSS resources between time t 1 and t 2 .
- a plurality of resources constituting a single CSS may be resources that are continuous in the time and / or frequency direction, or may be non-continuous resources. Further, some or all of the plurality of CSS resources may overlap in the time and / or frequency direction.
- a plurality of resources constituting a single CSS may have the same size (for example, the time resource size and the frequency resource size are the same), or different sizes (for example, the size of one resource may be the other). It may be an integer multiple of the resource size).
- the same resource mapping method may be applied to a plurality of CSS resources, or different resource mapping methods may be applied. For example, a distributed resource mapping for obtaining frequency diversity gain is set in one CSS resource, and a local resource mapping capable of obtaining a beamforming gain is set for the group UE in the other CSS resource. May be.
- the same transmission mode may be applied to a plurality of CSS resources, or different transmission modes may be applied.
- transmission diversity may be set in one CSS resource
- MIMO transmission that enables beam forming and / or spatial separation may be set in the other CSS resource.
- the same DCI format may be used for a plurality of CSS resources, or different DCI formats may be used.
- one CSS resource may be set in association with RA-RNTI so that only DCI scrambled with a random access identifier (eg, RA-RNTI) can be transmitted. It may be set in association with SI-RNTI so that only DCI scrambled with an information identifier (eg, SI-RNTI) can be transmitted.
- RA-RNTI random access identifier
- SI-RNTI information identifier
- the CSS resource amount information may include information on a plurality of resource amounts.
- the CSS resource amount information may include information for specifying a plurality of time resources, information for specifying a plurality of frequency resources (for example, a plurality of offset information), and the like.
- the default CSS resource amount may be determined by the specification, or may be set in the UE by MIB and / or SIB.
- the CSS resource amount information may be information indicating a difference from the default CSS resource amount.
- the UE may perform CSS reception processing based on the default CSS resource amount. Further, when the CSS resource amount information is notified, the UE may perform a CSS reception process based on the notified CSS resource amount instead of the default CSS resource amount. Further, the UE may perform the CSS reception process based on the default CSS resource amount after a predetermined period has elapsed since the CSS resource amount information was last notified.
- an appropriate CSS resource is considered in consideration of fluctuations (changes) in the traffic amount, pneumatics, etc. of the UE.
- Control can be performed.
- the UE can appropriately acquire downlink control information, paging, etc. during the RA procedure (for example, RAR and messages after RAR) by monitoring the CSS set by the broadcast information.
- the second embodiment of the present invention relates to a method for suppressing an increase in the number of CSS blind detections.
- the UE restricts an area to be monitored (at least one of a time resource, a frequency resource, and a search space). That is, the UE may monitor a part of all configured resources even when a predetermined CSS resource amount is set.
- the region to be monitored may be associated with information on RACH resources (time resource, frequency resource, code resource (eg, orthogonal code, sequence, etc.), format, coverage extension level, number of repeated transmissions, presence / absence of hopping, etc.) Good.
- RACH resources time resource, frequency resource, code resource (eg, orthogonal code, sequence, etc.), format, coverage extension level, number of repeated transmissions, presence / absence of hopping, etc.
- the UE may determine (specify) CSS resources (PDCCH set, CCE index, etc.) based on RACH (RA preamble) resources.
- the UE may determine the region to be monitored by CSS based on the RACH resource, cell identifier (for example, physical cell ID (Identifier), virtual cell ID), UE identifier, other information, or a combination thereof. .
- the UE determines a CSS resource to be monitored based on the selected or set RACH resource.
- the base station determines a CSS for DCI transmission based on the RACH resource that has received the RA preamble from the UE, and transmits the DCI using the determined CSS resource.
- the UE blindly detects the CSS resource to be monitored and tries to acquire DCI.
- FIG. 4 is a diagram illustrating an example of the setting of the restriction on the CSS to be monitored according to the second embodiment.
- FIG. 4 shows an example in which a plurality (two) non-contiguous frequency resources are set as CSS resources between time t 1 and t 2 , as in FIG. 3B. .
- CSS resources at time t 2 are classified into two monitored areas. One is a CSS resource associated with RA preambles # 0 to # N-1 (N is a natural number), and the other is a CSS resource associated with RA preambles #N to # 2N. The UE monitors any of these areas based on the transmitted RA preamble sequence.
- FIG. 4 shows an example in which a CSS is configured from a plurality of non-continuous frequency resources in the same period
- the region to be monitored may be a part or all of continuous frequency resources in the same period, or may be a part or all of continuous or non-continuous frequency resources in a plurality of different periods.
- the number of monitor target areas included (settable) within a single CSS is not limited to two, and may be one or three or more.
- the number of monitoring target areas included in a single CSS may be zero. In this case, the UE may perform control without monitoring the CSS.
- the number of blind decoding for CSS can be suppressed, and the processing load on the UE can be reduced.
- the CSS settings (configuration, resource amount, association between RA preamble and CSS resource (correspondence), monitored area, resource mapping method, transmission mode, DCI format used, identifier used for DCI scrambling, etc.) , RAR (message 2), retransmission of message 3, message 4, paging, system information, and uplink transmission power control may be different, or at least two of them may be common.
- the UE can use different CSS settings based on predetermined CSS resources. CSS resources may be determined. The UE may be notified of the offset information from a predetermined CSS resource, etc. as broadcast information or the like as information related to CSS settings. For example, the UE may determine that the CSS resource for message 4 is a resource obtained by shifting the CSS frequency resource for retransmission of message 3 by a predetermined RB based on the offset information.
- retransmission of message 3 and CSS setting after the retransmission may be specified by RAR (UL grant of message 3).
- RAR UL grant of message 3
- the CSS after establishing the RRC connection is set by upper layer signaling (for example, RRC signaling, broadcast information, MAC (Medium Access Control) signaling), physical layer signaling (for example, DCI), other signals, or a combination thereof ( Notification).
- the setting of the predetermined CSS may be set (notified) to the UE by broadcast information (MIB, SIB, etc.), may be determined in advance by specifications, or based on information transmitted by another CSS. May be set (notified) in the UE.
- the UE may determine the setting of the CSS for retransmission of the message 3 based on downlink control information transmitted by the CSS for RAR.
- All downlink control channels included in the same CSS may be transmitted using the same beam (the same BF may be applied), or may be transmitted using a plurality of different beams.
- a CSS resource downlink control channel
- different CSS resources may be transmitted using the same or different beams.
- wireless communication system Wireless communication system
- communication is performed using any one or a combination of the wireless communication methods according to the above embodiments of the present invention.
- FIG. 5 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), NR (New Radio), FRA (Future Radio Access), New-RAT (Radio Access Technology), etc., or a system that realizes these.
- 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 (also referred to as an existing carrier or a legacy carrier).
- a carrier having a relatively high frequency band for example, 3.5 GHz, 5 GHz, etc.
- the same carrier may be used.
- the configuration of the frequency band used by each radio base station is not limited to this.
- a wired connection for example, an optical fiber compliant with CPRI (Common Public Radio Interface), an X2 interface, etc.
- a wireless connection It can be set as the structure to do.
- the radio base station 11 and each radio base station 12 are connected to the higher station apparatus 30 and connected to the core network 40 via the higher station apparatus 30.
- the upper station device 30 includes, for example, an access gateway device, a radio network controller (RNC), a mobility management entity (MME), and the like, but is not limited thereto.
- RNC radio network controller
- MME mobility management entity
- Each radio base station 12 may be connected to the higher station apparatus 30 via the radio base station 11.
- the radio base station 11 is a radio base station having a relatively wide coverage, and may be called a macro base station, an aggregation node, an eNB (eNodeB), a transmission / reception point, or the like.
- the radio base station 12 is a radio base station having local coverage, and includes a small base station, a micro base station, a pico base station, a femto base station, a HeNB (Home eNodeB), an RRH (Remote Radio Head), and transmission / reception. It may be called a point.
- the radio base stations 11 and 12 are not distinguished, they are collectively referred to as a radio base station 10.
- Each user terminal 20 is a terminal that supports various communication schemes such as LTE and LTE-A, and may include not only a mobile communication terminal (mobile station) but also a fixed communication terminal (fixed station).
- orthogonal frequency division multiple access (OFDMA) is applied to the downlink, and single carrier-frequency division multiple access (SC-FDMA) is used for the uplink.
- SC-FDMA single carrier-frequency division multiple access
- OFDMA is a multi-carrier transmission scheme that performs communication by dividing a frequency band into a plurality of narrow frequency bands (subcarriers) and mapping data to each subcarrier.
- SC-FDMA is a single-carrier transmission scheme that reduces interference between terminals by dividing the system bandwidth into bands consisting of one or continuous resource blocks for each terminal and using a plurality of terminals with mutually different bands. is there.
- the uplink and downlink radio access schemes are not limited to these combinations, and other radio access schemes may be used.
- downlink channels include a downlink shared channel (PDSCH) shared by each user terminal 20, a broadcast channel (PBCH: Physical Broadcast Channel), a downlink L1 / L2 control channel, and the like. Used. User data, higher layer control information, SIB (System Information Block), etc. are transmitted by PDSCH. Also, MIB (Master Information Block) is transmitted by PBCH.
- PDSCH downlink shared channel
- PBCH Physical Broadcast Channel
- SIB System Information Block
- MIB Master Information Block
- Downlink L1 / L2 control channels include PDCCH (Physical Downlink Control Channel), EPDCCH (Enhanced Physical Downlink Control Channel), PCFICH (Physical Control Format Indicator Channel), PHICH (Physical Hybrid-ARQ Indicator Channel), and the like.
- Downlink control information (DCI: Downlink Control Information) including scheduling information of PDSCH and PUSCH is transmitted by PDCCH.
- the number of OFDM symbols used for PDCCH is transmitted by PCFICH.
- the PHICH transmits HARQ (Hybrid Automatic Repeat reQuest) acknowledgment information (for example, retransmission control information, HARQ-ACK, ACK / NACK, etc.) to the PUSCH.
- HARQ Hybrid Automatic Repeat reQuest
- EPDCCH is frequency-division multiplexed with PDSCH (downlink shared data channel), and is used for transmission of DCI and the like in the same manner as PDCCH.
- an uplink shared channel (PUSCH) shared by each user terminal 20
- an uplink control channel (PUCCH: Physical Uplink Control Channel)
- a random access channel (PRACH: Physical Random Access Channel)
- User data, higher layer control information, etc. are transmitted by PUSCH.
- downlink radio quality information (CQI: Channel Quality Indicator), delivery confirmation information, and the like are transmitted by PUCCH.
- CQI Channel Quality Indicator
- delivery confirmation information and the like are transmitted by PUCCH.
- a random access preamble for establishing connection with a cell is transmitted by the PRACH.
- a cell-specific reference signal CRS
- CSI-RS channel state information reference signal
- DMRS demodulation reference signal
- PRS Positioning Reference Signal
- a measurement reference signal SRS: Sounding Reference Signal
- a demodulation reference signal DMRS
- the DMRS may be referred to as a user terminal specific reference signal (UE-specific Reference Signal). Further, the transmitted reference signal is not limited to these.
- FIG. 6 is a diagram illustrating an example of the overall configuration of a radio base station according to an embodiment of the present invention.
- the radio base station 10 includes a plurality of transmission / reception antennas 101, an amplifier unit 102, a transmission / reception unit 103, a baseband signal processing unit 104, a call processing unit 105, and a transmission path interface 106.
- the transmission / reception antenna 101, the amplifier unit 102, and the transmission / reception unit 103 may each be configured to include one or more.
- User data transmitted from the radio base station 10 to the user terminal 20 via the downlink is input from the higher station apparatus 30 to the baseband signal processing unit 104 via the transmission path interface 106.
- PDCP Packet Data Convergence Protocol
- RLC Radio Link Control
- MAC Medium Access
- Retransmission control for example, HARQ transmission processing
- scheduling transmission format selection, channel coding, Inverse Fast Fourier Transform (IFFT) processing, precoding processing, and other transmission processing
- IFFT Inverse Fast Fourier Transform
- precoding processing precoding processing, and other transmission processing
- the downlink control signal is also subjected to transmission processing such as channel coding and inverse fast Fourier transform, and is transferred to the transmission / reception unit 103.
- the transmission / reception unit 103 converts the baseband signal output by precoding for each antenna from the baseband signal processing unit 104 to a radio frequency band and transmits the converted signal.
- the radio frequency signal frequency-converted by the transmission / reception unit 103 is amplified by the amplifier unit 102 and transmitted from the transmission / reception antenna 101.
- the transmission / reception unit 103 can be configured by a transmitter / receiver, a transmission / reception circuit, or a transmission / reception device, which is described based on common recognition in the technical field according to the present invention.
- the transmission / reception part 103 may be comprised as an integral transmission / reception part, and may be comprised from a transmission part and a receiving part.
- the radio frequency signal received by the transmission / reception antenna 101 is amplified by the amplifier unit 102.
- the transmission / reception unit 103 receives the uplink signal amplified by the amplifier unit 102.
- the transmission / reception unit 103 converts the frequency of the received signal into a baseband signal and outputs it to the baseband signal processing unit 104.
- the baseband signal processing unit 104 performs fast Fourier transform (FFT) processing, inverse discrete Fourier transform (IDFT: 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 processor 105 performs communication channel call processing (setting, release, etc.), status management of the radio base station 10, radio resource management, and the like.
- the transmission path interface 106 transmits and receives signals to and from the higher station apparatus 30 via a predetermined interface.
- the transmission path interface 106 transmits / receives signals (backhaul signaling) to / from other radio base stations 10 via an interface between base stations (for example, an optical fiber compliant with CPRI (Common Public Radio Interface), X2 interface). May be.
- CPRI Common Public Radio Interface
- X2 interface May be.
- the transmission / reception unit 103 may further include an analog beam forming unit that performs analog beam forming.
- the analog beam forming unit includes an analog beam forming circuit (for example, phase shifter, phase shift circuit) or an analog beam forming apparatus (for example, phase shifter) described based on common recognition in the technical field according to the present invention. May be.
- the transmission / reception antenna 101 may be constituted by an array antenna, for example.
- the transmission / reception unit 103 transmits downlink control information (DCI) using a downlink control channel (such as PDCCH) in at least a part of the predetermined CSS resource determined by the control unit 301. Further, the transmission / reception unit 103 may transmit at least one of broadcast information including information on the resource amount of the common search space (CSS) (CSS resource amount information) and a random access response.
- DCI downlink control information
- a downlink control channel such as PDCCH
- the transmission / reception unit 103 sets the CSS (the CSS configuration, the CSS resource position, the CSS resource amount, the association (correspondence relationship) between the RA preamble and the CSS resource, the monitoring target area, and the offset information for the user terminal 20. Etc.) may be transmitted. Further, the transmission / reception unit 103 may receive the RA preamble.
- FIG. 7 is a diagram illustrating an example of a functional configuration of a radio base station according to an embodiment of the present invention.
- the functional block of the characteristic part in this embodiment is mainly shown, and the wireless base station 10 shall also have another functional block required for radio
- the baseband signal processing unit 104 includes at least a control unit (scheduler) 301, a transmission signal generation unit 302, a mapping unit 303, a reception signal processing unit 304, and a measurement unit 305. These configurations may be included in the radio base station 10, and a part or all of the configurations may not be included in the baseband signal processing unit 104.
- the control unit (scheduler) 301 controls the entire radio base station 10.
- the control part 301 can be comprised from the controller, the control circuit, or control apparatus demonstrated based on the common recognition in the technical field which concerns on this invention.
- the control unit 301 controls, for example, signal generation by the transmission signal generation unit 302, signal allocation by the mapping unit 303, and the like.
- the control unit 301 also controls signal reception processing by the reception signal processing unit 304, signal measurement by the measurement unit 305, and the like.
- the control unit 301 controls scheduling (for example, resource allocation) of system information, a downlink data signal transmitted on the PDSCH, and a downlink control signal transmitted on the PDCCH and / or EPDCCH. Further, the control unit 301 controls generation of a downlink control signal (for example, delivery confirmation information), a downlink data signal, and the like based on a result of determining whether or not retransmission control is required for the uplink data signal. Further, the control unit 301 controls scheduling of synchronization signals (for example, PSS (Primary Synchronization Signal) / SSS (Secondary Synchronization Signal)), downlink reference signals (for example, CRS, CSI-RS, DMRS) and the like.
- PSS Primary Synchronization Signal
- SSS Secondary Synchronization Signal
- control unit 301 includes an uplink data signal transmitted on the PUSCH, an uplink control signal transmitted on the PUCCH and / or PUSCH (for example, delivery confirmation information), a random access preamble transmitted on the PRACH, an uplink reference signal, etc. Control scheduling.
- the control unit 301 determines the CSS resource amount, the resource location, the number, etc. in consideration of at least one of the traffic amount, channel state, moving speed, location, applied neurology, etc. regarding the cell and / or UE. May be.
- the control unit 301 may configure a plurality of downlink control channels (for example, PDCCH sets) by FDM and / or TDM for a single CSS.
- the control unit 301 may perform control to transmit CSS resource amount information indicating the determined CSS resource amount.
- the control unit 301 When acquiring the RA preamble from the received signal processing unit 304, the control unit 301 maps (transmits) downlink control information within a predetermined CSS based on information (for example, RACH resource) used for transmission of the RA preamble.
- the resource to be used may be determined.
- the control unit 301 may perform control for notifying the user terminal 20 of a plurality of CSS resource amount information during the RA procedure of the predetermined user terminal 20. For example, the control unit 301 transmits the first CSS resource amount information for the user terminal 20 to determine the resource of the first CSS (for example, the CSS of the message 2), and the second CSS (for example, the message 4). The second CSS resource amount information for the user terminal 20 to determine the resource of the CSS may be transmitted.
- the control unit 301 uses the digital BF (for example, precoding) by the baseband signal processing unit 104 and / or the analog BF (for example, phase rotation) by the transmission / reception unit 103 to form a transmission beam and / or a reception beam. To control.
- the control unit 301 may perform control so as to form a beam based on downlink propagation path information, uplink propagation path information, and the like. Such propagation path information may be acquired from the reception signal processing unit 304 and / or the measurement unit 305.
- the transmission signal generation unit 302 generates a downlink signal (downlink control signal, downlink data signal, downlink reference signal, etc.) based on an instruction from the control unit 301, and outputs it to the mapping unit 303.
- the transmission signal generation unit 302 can be configured by a signal generator, a signal generation circuit, or a signal generation device described based on common recognition in the technical field according to the present invention.
- the transmission signal generation unit 302 generates, for example, a DL assignment that notifies downlink signal allocation information and a UL grant that notifies uplink signal allocation information based on an instruction from the control unit 301.
- the downlink data signal is subjected to coding processing and modulation processing according to a coding rate, a modulation scheme, and the like determined based on channel state information (CSI: Channel State Information) from each user terminal 20.
- CSI Channel State Information
- the mapping unit 303 maps the downlink signal generated by the transmission signal generation unit 302 to a predetermined radio resource based on an instruction from the control unit 301, and outputs it to the transmission / reception unit 103.
- the mapping unit 303 can be configured by a mapper, a mapping circuit, or a mapping device described based on common recognition in the technical field according to the present invention.
- the reception signal processing unit 304 performs reception processing (for example, demapping, demodulation, decoding, etc.) on the reception signal input from the transmission / reception unit 103.
- the received signal is, for example, an uplink signal (uplink control signal, uplink data signal, uplink reference signal, etc.) transmitted from the user terminal 20.
- the reception signal processing unit 304 can be configured by a signal processor, a signal processing circuit, or a signal processing device described based on common recognition in the technical field according to the present invention.
- the reception signal processing unit 304 outputs the information decoded by the reception processing to the control unit 301. For example, when receiving PUCCH including HARQ-ACK, HARQ-ACK is output to control section 301.
- the reception signal processing unit 304 outputs the reception signal and / or the signal after reception processing to the measurement unit 305.
- the measurement unit 305 performs measurement on the received signal.
- the measurement part 305 can be comprised from the measuring device, measurement circuit, or measurement apparatus demonstrated based on common recognition in the technical field which concerns on this invention.
- the measurement unit 305 may, for example, receive power of a received signal (for example, RSRP (Reference Signal Received Power)), reception quality (for example, RSRQ (Reference Signal Received Quality), SINR (Signal to Interference plus Noise Ratio)), downlink You may measure about propagation path information (for example, CSI), uplink propagation path information, round-trip propagation path information, etc.
- RSRP Reference Signal Received Power
- reception quality for example, RSRQ (Reference Signal Received Quality)
- SINR Signal to Interference plus Noise Ratio
- the measurement result may be output to the control unit 301.
- FIG. 8 is a diagram illustrating an example of the overall configuration of a user terminal according to an embodiment of the present invention.
- the user terminal 20 includes a plurality of transmission / reception antennas 201, an amplifier unit 202, a transmission / reception unit 203, a baseband signal processing unit 204, and an application unit 205.
- the transmission / reception antenna 201, the amplifier unit 202, and the transmission / reception unit 203 may each be configured to include one or more.
- the radio frequency signal received by the transmission / reception antenna 201 is amplified by the amplifier unit 202.
- the transmission / reception unit 203 receives the downlink signal amplified by the amplifier unit 202.
- the transmission / reception unit 203 converts the frequency of the received signal into a baseband signal and outputs it to the baseband signal processing unit 204.
- the transmission / reception unit 203 can be configured by a transmitter / receiver, a transmission / reception circuit, or a transmission / reception device described based on common recognition in the technical field according to the present invention.
- the transmission / reception unit 203 may be configured as an integral transmission / reception unit, or may be configured from a transmission unit and a reception unit.
- the baseband signal processing unit 204 performs FFT processing, error correction decoding, retransmission control reception processing, and the like on the input baseband signal.
- the downlink user data is transferred to the application unit 205.
- the application unit 205 performs processing related to layers higher than the physical layer and the MAC layer. Also, broadcast information of downlink data may be transferred to the application unit 205.
- uplink user data is input from the application unit 205 to the baseband signal processing unit 204.
- the baseband signal processing unit 204 performs transmission / reception units for retransmission control (for example, HARQ transmission processing), channel coding, precoding, discrete Fourier transform (DFT) processing, IFFT processing, and the like.
- the transmission / reception unit 203 converts the baseband signal output from the baseband signal processing unit 204 into a radio frequency band and transmits it.
- the radio frequency signal frequency-converted by the transmission / reception unit 203 is amplified by the amplifier unit 202 and transmitted from the transmission / reception antenna 201.
- the transmission / reception unit 203 may further include an analog beam forming unit that performs analog beam forming.
- the analog beam forming unit includes an analog beam forming circuit (for example, phase shifter, phase shift circuit) or an analog beam forming apparatus (for example, phase shifter) described based on common recognition in the technical field according to the present invention. May be.
- the transmission / reception antenna 201 may be constituted by an array antenna, for example.
- the transmission / reception unit 203 monitors a downlink control channel (such as PDCCH) in at least a part of predetermined CSS resources determined by the control unit 401. Further, the transmission / reception unit 203 may receive at least one of broadcast information (such as MIB and SIB) including CSS resource amount information and a random access response.
- a downlink control channel such as PDCCH
- the transmission / reception unit 203 may receive at least one of broadcast information (such as MIB and SIB) including CSS resource amount information and a random access response.
- the transmission / reception unit 203 receives the CSS setting (CSS configuration, CSS resource position, CSS resource amount, association (correspondence relationship) between RA preamble and CSS resource, monitoring target region, offset information, etc. from the radio base station 10 ) May be received. Further, the transmission / reception unit 203 may transmit the RA preamble.
- CSS setting CSS configuration, CSS resource position, CSS resource amount, association (correspondence relationship) between RA preamble and CSS resource, monitoring target region, offset information, etc.
- FIG. 9 is a diagram illustrating an example of a functional configuration of a user terminal according to an embodiment of the present invention.
- the functional blocks of the characteristic part in the present embodiment are mainly shown, and the user terminal 20 also has other functional blocks necessary for wireless communication.
- the baseband signal processing unit 204 included in the user terminal 20 includes at least a control unit 401, a transmission signal generation unit 402, a mapping unit 403, a reception signal processing unit 404, and a measurement unit 405. Note that these configurations may be included in the user terminal 20, and some or all of the configurations may not be included in the baseband signal processing unit 204.
- the control unit 401 controls the entire user terminal 20.
- the control unit 401 can be composed of a controller, a control circuit, or a control device described based on common recognition in the technical field according to the present invention.
- the control unit 401 controls, for example, signal generation by the transmission signal generation unit 402, signal allocation by the mapping unit 403, and the like.
- the control unit 401 also controls signal reception processing by the reception signal processing unit 404, signal measurement by the measurement unit 405, and the like.
- the control unit 401 obtains, from the received signal processing unit 404, a downlink control signal (a signal transmitted by PDCCH / EPDCCH) and a downlink data signal (a signal transmitted by PDSCH) transmitted from the radio base station 10.
- the control unit 401 controls generation of an uplink control signal (eg, delivery confirmation information) and / or an uplink data signal based on a result of determining whether or not retransmission control is required for the downlink control signal and / or downlink data signal. To do.
- the control unit 401 determines a resource of a predetermined CSS based on information (CSS resource amount information) regarding the resource amount of the common search space (CSS).
- the CSS resource information may be acquired from the received signal processing unit 404.
- the control unit 401 may determine that a predetermined CSS resource is composed of a continuous resource or a plurality of discontinuous resources based on the CSS resource amount information.
- the control unit 401 may control the transmission of the RA preamble based on information on the RACH resource (may be referred to as PRACH resource information, RA preamble information, etc.). Further, the control unit 401 may determine a predetermined CSS resource to be monitored (monitored) based on information (for example, information on the RACH resource) used for transmission of the RA preamble.
- information on the RACH resource may be referred to as PRACH resource information, RA preamble information, etc.
- the control unit 401 may determine a predetermined CSS resource to be monitored (monitored) based on information (for example, information on the RACH resource) used for transmission of the RA preamble.
- the control unit 401 may determine different CSS resources based on a plurality of pieces of CSS resource amount information during the RA procedure. For example, the control unit 401 determines the resource of the first CSS (for example, the CSS of the message 2) based on the first CSS resource amount information, and determines the second CSS (based on the second CSS resource amount information). For example, the CSS resource of message 4 may be determined.
- the control unit 401 uses the digital BF (for example, precoding) by the baseband signal processing unit 204 and / or the analog BF (for example, phase rotation) by the transmission / reception unit 203 to form a transmission beam and / or a reception beam. You may control to.
- the control unit 401 may perform control so as to form a beam based on downlink propagation path information, uplink propagation path information, and the like. Such propagation path information may be acquired from the reception signal processing unit 404 and / or the measurement unit 405.
- control unit 401 may update parameters used for control based on the information.
- the transmission signal generation unit 402 generates an uplink signal (uplink control signal, uplink data signal, uplink reference signal, etc.) based on an instruction from the control unit 401 and outputs the uplink signal to the mapping unit 403.
- the transmission signal generation unit 402 can be configured by a signal generator, a signal generation circuit, or a signal generation device described based on common recognition in the technical field according to the present invention.
- the transmission signal generation unit 402 generates an uplink control signal related to delivery confirmation information, channel state information (CSI), and the like based on an instruction from the control unit 401, for example. In addition, the transmission signal generation unit 402 generates an uplink data signal based on an instruction from the control unit 401. For example, the transmission signal generation unit 402 is instructed by the control unit 401 to generate an uplink data signal when the UL grant is included in the downlink control signal notified from the radio base station 10.
- CSI channel state information
- the mapping unit 403 maps the uplink signal generated by the transmission signal generation unit 402 to a radio resource based on an instruction from the control unit 401, and outputs the radio signal to the transmission / reception unit 203.
- the mapping unit 403 can be configured by a mapper, a mapping circuit, or a mapping device described based on common recognition in the technical field according to the present invention.
- the reception signal processing unit 404 performs reception processing (for example, demapping, demodulation, decoding, etc.) on the reception signal input from the transmission / reception unit 203.
- the received signal is, for example, a downlink signal (downlink control signal, downlink data signal, downlink reference signal, etc.) transmitted from the radio base station 10.
- the reception signal processing unit 404 can be configured by a signal processor, a signal processing circuit, or a signal processing device described based on common recognition in the technical field according to the present invention. Further, the reception signal processing unit 404 can constitute a reception unit according to the present invention.
- the reception signal processing unit 404 outputs the information decoded by the reception processing to the control unit 401.
- the reception signal processing unit 404 outputs, for example, broadcast information, system information, RRC signaling, DCI, and the like to the control unit 401.
- the reception signal processing unit 404 outputs the reception signal and / or the signal after reception processing to the measurement unit 405.
- the measurement unit 405 performs measurement on the received signal.
- the measurement unit 405 performs measurement using the downlink reference signal 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 includes, for example, received power (for example, RSRP) of received signals, reception quality (for example, RSRQ, received SINR), downlink channel information (for example, CSI), uplink channel information, round-trip channel information, and the like. May be measured.
- 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. 10 is a diagram illustrating an example of a hardware configuration of a radio base station and a user terminal according to an embodiment of the present invention.
- the wireless base station 10 and the user terminal 20 described above may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like. Good.
- the term “apparatus” can be read as a circuit, a device, a unit, or the like.
- the hardware configurations of the radio base station 10 and the user terminal 20 may be configured to include one or a plurality of each device illustrated in the figure, or may be configured not to include some devices.
- processor 1001 may be implemented by one or more chips.
- each function in the radio base station 10 and the user terminal 20 reads predetermined software (program) on hardware such as the processor 1001 and the memory 1002, so that the processor 1001 performs computation and communication by the communication device 1004. It is realized by controlling the reading and / or writing of data in the memory 1002 and the storage 1003.
- the processor 1001 controls the entire computer by operating an operating system, for example.
- the processor 1001 may be configured by a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, a register, and the like.
- CPU central processing unit
- the baseband signal processing unit 104 (204) and the call processing unit 105 described above may be realized by the processor 1001.
- the processor 1001 reads programs (program codes), software modules, data, and the like from the storage 1003 and / or the communication device 1004 to the memory 1002, and executes various processes according to these.
- programs program codes
- software modules software modules
- data data
- the like data
- the control unit 401 of the user terminal 20 may be realized by a control program stored in the memory 1002 and operated by the processor 1001, and may be realized similarly for other functional blocks.
- the memory 1002 is a computer-readable recording medium such as a ROM (Read Only Memory), an EPROM (Erasable Programmable ROM), an EEPROM (Electrically EPROM), a RAM (Random Access Memory), or any other suitable storage medium. It may be configured by one.
- the memory 1002 may be called a register, a cache, a main memory (main storage device), or the like.
- the memory 1002 can store programs (program codes), software modules, and the like that can be executed to implement the wireless communication method according to an embodiment of the present invention.
- the storage 1003 is a computer-readable recording medium such as a flexible disk, a floppy (registered trademark) disk, a magneto-optical disk (for example, a compact disk (CD-ROM (Compact Disc ROM)), a digital versatile disk, Blu-ray® disk), removable disk, hard disk drive, smart card, flash memory device (eg, card, stick, key drive), magnetic stripe, database, server, or other suitable storage medium It may be constituted by.
- the storage 1003 may be referred to as an auxiliary storage device.
- the communication device 1004 is hardware (transmission / reception device) for performing communication between computers via a wired and / or wireless network, and is also referred to as a network device, a network controller, a network card, a communication module, or the like.
- the communication device 1004 includes, for example, a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc., in order to realize frequency division duplex (FDD) and / or time division duplex (TDD). It may be configured.
- FDD frequency division duplex
- TDD time division duplex
- the transmission / reception antenna 101 (201), the amplifier unit 102 (202), the transmission / reception unit 103 (203), the transmission path interface 106, and the like described above may be realized by the communication device 1004.
- the input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that accepts an input from the outside.
- the output device 1006 is an output device (for example, a display, a speaker, an LED (Light Emitting Diode) lamp, etc.) that performs output to the outside.
- the input device 1005 and the output device 1006 may have an integrated configuration (for example, a touch panel).
- each device such as the processor 1001 and the memory 1002 is connected by a bus 1007 for communicating information.
- the bus 1007 may be configured with a single bus or may be configured with different buses between apparatuses.
- the radio base station 10 and the user terminal 20 include a microprocessor, a digital signal processor (DSP), an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), an FPGA (Field Programmable Gate Array), and the like. It may be configured including hardware, and a part or all of each functional block may be realized by the hardware. For example, the processor 1001 may be implemented by at least one of these hardware.
- DSP digital signal processor
- ASIC Application Specific Integrated Circuit
- PLD Programmable Logic Device
- FPGA Field Programmable Gate Array
- the channel and / or symbol may be a signal (signaling).
- the signal may be a message.
- the reference signal may be abbreviated as RS (Reference Signal), and may be referred to as a pilot, a pilot signal, or the like depending on an applied standard.
- a component carrier CC: Component Carrier
- CC Component Carrier
- the radio frame may be configured with one or a plurality of periods (frames) in the time domain.
- Each of the one or more periods (frames) constituting the radio frame may be referred to as a subframe.
- a subframe may be composed of one or more slots in the time domain.
- the 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)
- 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.
- a unit representing TTI may be called a slot, a minislot, or the like instead of a subframe.
- TTI means, for example, a minimum time unit for scheduling in wireless communication.
- a radio base station performs scheduling for assigning radio resources (frequency bandwidth, transmission power, etc. that can be used in each user terminal) to each user terminal in units of TTI.
- the definition of TTI is not limited to this.
- the TTI may be a transmission time unit of a channel-encoded data packet (transport block), 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 long TTI (eg, normal TTI, subframe, etc.) may be read as a TTI having a time length exceeding 1 ms, and a short TTI (eg, shortened TTI) is less than the TTI length of the long TTI and 1 ms. It may be replaced with a TTI having the above TTI length.
- a resource block is a resource allocation unit in the time domain and the frequency domain, and may include one or a plurality of continuous subcarriers (subcarriers) in the frequency domain. Further, the RB may include one or a plurality of symbols in the time domain, and may have a length of 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 changed in various ways.
- information, parameters, and the like described in this specification may be represented by absolute values, may be represented by relative values from a predetermined value, or may be represented by other corresponding information.
- the radio resource may be indicated by a predetermined index.
- mathematical formulas and the like using these parameters may differ from those explicitly disclosed herein.
- PUCCH Physical Uplink Control Channel
- PDCCH Physical Downlink Control Channel
- information elements can be identified by any suitable name, so the various channels and information elements assigned to them.
- the name is not limiting in any way.
- information, signals, etc. can be output from the upper layer to the lower layer and / or from the lower layer to the upper layer.
- Information, signals, and the like may be input / output via a plurality of network nodes.
- the input / output information, signals, etc. may be stored in a specific location (for example, a memory), or may be managed by a management table. Input / output information, signals, and the like can be overwritten, updated, or added. The output information, signals, etc. may be deleted. Input information, signals, and the like may be transmitted to other devices.
- information notification includes physical layer signaling (eg, downlink control information (DCI), uplink control information (UCI)), upper layer signaling (eg, RRC (Radio Resource Control) signaling), It may be implemented by broadcast information (Master Information Block (MIB), System Information Block (SIB), etc.), MAC (Medium Access Control) signaling), other signals, or a combination thereof.
- DCI downlink control information
- UCI uplink control information
- RRC Radio Resource Control
- MIB Master Information Block
- SIB System Information Block
- MAC Medium Access Control
- the physical layer signaling may be referred to as L1 / L2 (Layer 1 / Layer 2) control information (L1 / L2 control signal), L1 control information (L1 control signal), or the like.
- the RRC signaling may be referred to as an RRC message, and may be, for example, an RRC connection setup (RRCConnectionSetup) message, an RRC connection reconfiguration (RRCConnectionReconfiguration) message, or the like.
- the MAC signaling may be notified by, for example, a MAC control element (MAC CE (Control Element)).
- notification of predetermined information is not limited to explicitly performed, but implicitly (for example, by not performing notification of the predetermined information or another (By notification of information).
- the determination may be performed by a value represented by 1 bit (0 or 1), or may be performed by a boolean value represented by true or false.
- the comparison may be performed by numerical comparison (for example, comparison with a predetermined value).
- software, instructions, information, etc. may be 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
- gNB gNodeB
- cell gNodeB
- 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, NodeB, eNodeB (eNB), access point, transmission point, reception point, femtocell, and 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
- MS mobile station
- UE user equipment
- terminal may be used interchangeably.
- a base station may also be called in terms such as a fixed station, NodeB, eNodeB (eNB), access point, transmission point, reception point, femtocell, and small cell.
- NodeB NodeB
- eNodeB eNodeB
- access point transmission point
- reception point femtocell
- small cell small cell
- a mobile station is defined by those skilled in the art as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless It may also be called terminal, remote terminal, handset, user agent, mobile client, client or some other suitable terminology.
- the radio base station in this specification may be read by the user terminal.
- each aspect / embodiment of the present invention may be applied to a configuration in which communication between a radio base station and a user terminal is replaced with communication between a plurality of user terminals (D2D: Device-to-Device).
- the user terminal 20 may have a function that the wireless base station 10 has.
- words such as “up” and “down” may be read as “side”.
- the uplink channel may be read as a side channel.
- a user terminal in this specification may be read by a radio base station.
- the wireless base station 10 may have a function that the user terminal 20 has.
- the specific operation assumed to be performed by the base station may be performed by the upper node in some cases.
- various operations performed for communication with a terminal may be performed by one or more network nodes other than the base station and the base station (for example, It is obvious that this can be done by MME (Mobility Management Entity), S-GW (Serving-Gateway), etc., but not limited thereto) or a combination thereof.
- MME Mobility Management Entity
- S-GW Serving-Gateway
- each aspect / embodiment described in this specification may be used alone, in combination, or may be switched according to execution.
- the order of the processing procedures, sequences, flowcharts, and the like of each aspect / embodiment described in this specification may be changed as long as there is no contradiction.
- the methods described herein present the elements of the various steps in an exemplary order and are not limited to the specific order presented.
- Each aspect / embodiment described herein includes LTE (Long Term Evolution), LTE-A (LTE-Advanced), LTE-B (LTE-Beyond), SUPER 3G, IMT-Advanced, 4G (4th generation mobile). communication system), 5G (5th generation mobile communication system), FRA (Future Radio Access), New-RAT (Radio Access Technology), NR (New Radio), NX (New radio access), FX (Future generation radio access), GSM (registered trademark) (Global System for Mobile communications), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802 .20, UWB (Ultra-WideBand), Bluetooth (registered trademark), The present invention may be applied to a system using other appropriate wireless communication methods and / or a next generation system extended based on these.
- the phrase “based on” does not mean “based only on”, unless expressly specified otherwise. In other words, the phrase “based on” means both “based only on” and “based at least on.”
- any reference to elements using designations such as “first”, “second”, etc. as used herein does not generally limit the amount or order of those elements. These designations can be used herein as a convenient way to distinguish between two or more elements. Thus, reference to the first and second elements does not mean that only two elements can be employed or that the first element must precede the second element in some way.
- determining may encompass a wide variety of actions. For example, “determination” means calculating, computing, processing, deriving, investigating, looking up (eg, table, database or other data). It may be considered to “judge” (search in structure), ascertaining, etc.
- “determination (decision)” includes receiving (for example, receiving information), transmitting (for example, transmitting information), input (input), output (output), access ( accessing) (e.g., accessing data in memory), etc. may be considered to be “determining”. Also, “determination” is considered to be “determination (resolving)”, “selecting”, “choosing”, “establishing”, “comparing”, etc. Also good. That is, “determination (determination)” may be regarded as “determination (determination)” of some operation.
- connection refers to any direct or indirect connection between two or more elements or By coupling, it can include the presence of one or more intermediate elements between two elements that are “connected” or “coupled” to each other.
- the coupling or connection between the elements may be physical, logical, or a combination thereof.
- connection may be read as “access”.
- the two elements are radio frequency by using one or more wires, cables and / or printed electrical connections, and as some non-limiting and non-inclusive examples It can be considered to be “connected” or “coupled” to each other, such as by using electromagnetic energy having wavelengths in the region, microwave region, and / or light (both visible and invisible) region.
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- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Databases & Information Systems (AREA)
- Computer Security & Cryptography (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
Description
<第1の実施形態>
本発明の第1の実施形態においては、CSSのリソース量がブロードキャストを用いて可変に設定される。具体的には、CSSを用いる下り制御チャネル用の時間及び/又は周波数リソース量を可変とする。
本発明の第2の実施形態は、CSSのブラインド検出数の増大を抑えるための方法に関する。第2の実施形態において、UEは、モニタする領域(時間リソース、周波数リソース、サーチスペースの少なくとも1つ)を制限する。つまり、UEは、所定のCSSリソース量が設定される場合であっても、設定される全リソースの一部をモニタしてもよい。
なお、CSSの設定(構成、リソース量、RAプリアンブルとCSSリソースとの関連付け(対応関係)、モニタ対象の領域、リソースマッピング方法、送信モード、用いられるDCIフォーマット、DCIのスクランブルに用いる識別子など)は、RAR(メッセージ2)、メッセージ3の再送、メッセージ4、ページング、システム情報及び上りの送信電力制御それぞれについて異なってもよいし、これらのうち少なくとも2つは共通であってもよい。
以下、本発明の一実施形態に係る無線通信システムの構成について説明する。この無線通信システムでは、本発明の上記各実施形態に係る無線通信方法のいずれか又はこれらの組み合わせを用いて通信が行われる。
図6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8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)
- 共通サーチスペースのリソース量に関する情報に基づいて、所定の共通サーチスペースのリソースを判断する制御部と、
前記所定の共通サーチスペースのリソースの少なくとも一部において、下り制御チャネルをモニタする受信部と、を有することを特徴とするユーザ端末。 - 前記受信部は、ブロードキャスト情報及びランダムアクセスレスポンスの少なくとも1つに含まれる前記リソース量に関する情報を受信することを特徴とする請求項1に記載のユーザ端末。
- 前記制御部は、前記リソース量に関する情報に基づいて、前記所定の共通サーチスペースのリソースが複数の非連続なリソースで構成されると判断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。
- ランダムアクセスプリアンブルを送信する送信部を有し、
前記制御部は、前記ランダムアクセスプリアンブルの送信に用いた情報に基づいて、モニタする前記所定の共通サーチスペースのリソースを判断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、ランダムアクセス手順中に、複数の前記リソース量に関する情報に基づいて、それぞれ別の共通サーチスペースのリソースを判断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、
共通サーチスペースのリソース量に関する情報に基づいて、所定の共通サーチスペースのリソースを判断する工程と、
前記所定の共通サーチスペースのリソースの少なくとも一部において、下り制御チャネルをモニタする工程と、を有することを特徴とする無線通信方法。
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EP17856404.3A EP3515144A4 (en) | 2016-09-29 | 2017-09-29 | USER DEVICE AND WIRELESS COMMUNICATION PROCESS |
JP2018542901A JPWO2018062455A1 (ja) | 2016-09-29 | 2017-09-29 | ユーザ端末及び無線通信方法 |
CN201780071474.7A CN109983816A (zh) | 2016-09-29 | 2017-09-29 | 用户终端和无线通信方法 |
US16/337,551 US20190281539A1 (en) | 2016-09-29 | 2017-09-29 | User terminal and radio communication method |
BR112019006067A BR112019006067A2 (pt) | 2016-09-29 | 2017-09-29 | terminal de usuário e método de radiocomunicação |
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EP (1) | EP3515144A4 (ja) |
JP (1) | JPWO2018062455A1 (ja) |
CN (1) | CN109983816A (ja) |
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JP2021518089A (ja) * | 2018-04-13 | 2021-07-29 | 維沃移動通信有限公司Vivo Mobile Communication Co., Ltd. | 制御方法及び端末 |
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CN117042160A (zh) * | 2017-10-24 | 2023-11-10 | Lg电子株式会社 | 基站和由基站执行的方法 |
JP7343958B2 (ja) * | 2019-10-11 | 2023-09-13 | 株式会社Nttドコモ | 端末、無線通信方法、基地局及びシステム |
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US20190281539A1 (en) | 2019-09-12 |
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