WO2018124026A1 - Équipement utilisateur, station de base radio, et procédé de radiocommunication - Google Patents

Équipement utilisateur, station de base radio, et procédé de radiocommunication Download PDF

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Publication number
WO2018124026A1
WO2018124026A1 PCT/JP2017/046557 JP2017046557W WO2018124026A1 WO 2018124026 A1 WO2018124026 A1 WO 2018124026A1 JP 2017046557 W JP2017046557 W JP 2017046557W WO 2018124026 A1 WO2018124026 A1 WO 2018124026A1
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WIPO (PCT)
Prior art keywords
signal
transmission
user terminal
base station
unit
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PCT/JP2017/046557
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English (en)
Japanese (ja)
Inventor
大輔 村山
和晃 武田
聡 永田
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株式会社Ｎｔｔドコモ
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Publication of WO2018124026A1 publication Critical patent/WO2018124026A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/24—Cell structures
    • H04W16/28—Cell structures using beam steering
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices

Definitions

  • the present invention relates to a user terminal, a radio base station, and a radio communication method in a next-generation mobile communication system.
  • LTE Long Term Evolution
  • Non-patent Document 1 LTE successor systems (for example, LTE-A (LTE-Advanced), FRA (Future Radio Access), 4G, 5G, 5G + (plus), NR ( New RAT), LTE Rel.14, 15 ⁇ , etc.) are also being considered.
  • an existing LTE system for example, LTE Rel. 8-13
  • UL synchronization when UL synchronization is established between a radio base station and a user terminal, UL data can be transmitted from the user terminal.
  • the existing LTE system supports a random access procedure (RACH procedure: Random Access Channel Procedure, also referred to as access procedure) for establishing UL synchronization.
  • RACH procedure Random Access Channel Procedure, also referred to as access procedure
  • the user terminal sends information on the UL transmission timing (timing advance (TA)) with a response (random access response) from the radio base station to a randomly selected preamble (random access preamble). Acquire and establish UL synchronization based on the TA.
  • timing advance TA
  • random access response random access response
  • the user terminal After the UL synchronization is established, the user terminal receives downlink control information (DCI: Downlink Control Information) (UL grant) from the radio base station, and then transmits UL data using the UL resource allocated by the UL grant. To do.
  • DCI Downlink Control Information
  • UL grant Downlink Control Information
  • E-UTRA Evolved Universal Terrestrial Radio Access
  • E-UTRAN Evolved Universal Terrestrial Radio Access Network
  • Future wireless communication systems for example, 5G, NR are expected to realize various wireless communication services to meet different requirements (for example, ultra-high speed, large capacity, ultra-low delay, etc.) Yes.
  • a beam can be formed by controlling the amplitude and / or phase of a signal transmitted / received from each element. This processing is also called beam forming (BF) and can reduce radio wave propagation loss.
  • BF beam forming
  • 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, a radio base station, and a radio communication method capable of appropriately performing a random access procedure in communication using beamforming. To do.
  • a user terminal includes a receiving unit that receives a DL signal transmitted from a radio base station, a transmitting unit that transmits a UL signal in a random access procedure, and beam forming applied to the UL signal.
  • a control unit that controls transmission, wherein the control unit controls transmission using at least one beam and / or transmission timing applied to the UL signal based on the DL signal.
  • Random access procedures include collision-type random access (CBRA: Contention-Based Random Access), non-collision-type random access (Non-CBRA, contention-free random access (CFRA), Non- contention-based).
  • CBRA collision-type random access
  • Non-CBRA non-collision-type random access
  • CFRA contention-free random access
  • CBRA collision type random access
  • a user terminal selects a preamble randomly selected from a plurality of preambles (also referred to as a random access preamble, a random access channel (PRACH), a RACH preamble, etc.) defined in each cell.
  • Collision-type random access is a random access procedure led by a user terminal, and can be used, for example, at the time of initial access, at the start or restart of UL transmission, and the like.
  • Non-collision type random access (Non-CBRA, CFRA: Contention-Free Random Access)
  • the radio base station uses a downlink (DL) control channel (PDCCH: Physical Downlink Control Channel, EPDCCH: Enhanced PDCCH, etc.) as a preamble. Is uniquely assigned to the user terminal, and the user terminal transmits the preamble assigned by the radio base station.
  • Non-collision type random access is a network-initiated random access procedure, and can be used, for example, at the time of handover, when DL transmission is started or restarted (when DL retransmission instruction information transmission is started or restarted). .
  • FIG. 1 is a diagram showing an example of collision-type random access.
  • a user terminal uses a random access channel (for example, MIB (Mater Information Block) and / or SIB (System Information Block)) or higher layer signaling (for example, RRC (Radio Resource Control) signaling).
  • Information PRACH configuration information
  • PRACH configuration indicating a PRACH configuration (PRACH configuration, RACH configuration) is received in advance.
  • the PRACH configuration information includes, for example, a plurality of preambles (for example, preamble format) defined for each cell, time resources (for example, system frame number, subframe number) used for PRACH transmission, and frequency resources (for example, 6 resource blocks) (PRB: Physical Resource Block) offset (prach-FrequencyOffset) indicating the start position can be indicated.
  • preamble format for example, preamble format
  • time resources for example, system frame number, subframe number
  • frequency resources for example, 6 resource blocks
  • PRB Physical Resource Block
  • prach-FrequencyOffset Physical Resource Block
  • the radio base station When the radio base station detects the preamble, it transmits a random access response (RAR: Random Access Response) as a response (message 2).
  • RAR Random Access Response
  • the user terminal fails to receive the RAR within a predetermined period (RAR window) after transmitting the preamble, the user terminal increases the transmission power of the PRACH and transmits (retransmits) the preamble again. Note that increasing the transmission power during retransmission is also called power ramping.
  • the user terminal 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 user terminal transmits a control message of a higher layer (L2 / L3: Layer 2 / Layer 3) using a UL resource specified by the UL grant included in the RAR (message 3).
  • the control message includes a user terminal identifier (UE-ID).
  • the identifier of the user terminal may be, for example, C-RNTI (Cell-Radio Network Temporary Identifier) in the RRC connection state, or S-TMSI (System Architecture Evolution-Temporary Mobile in the idle state). It may be a higher-layer UE-ID such as (Subscriber Identity).
  • the radio base station transmits a collision resolution message in response to the upper layer control message (message 4).
  • the collision resolution message is transmitted based on the user terminal identifier included in the control message.
  • the user terminal that has successfully detected the collision resolution message transmits an acknowledgment (ACK: Acknowledge) in HARQ (Hybrid Automatic Repeat reQuest) to the radio base station. Thereby, the user terminal in an idle state transits to the RRC connection state.
  • ACK Acknowledge
  • HARQ Hybrid Automatic Repeat reQuest
  • the user terminal that failed to detect the collision resolution message determines that a collision has occurred, reselects the preamble, and repeats the random access procedure of messages 1 to 4.
  • the radio base station detects that the collision has been resolved by the ACK from the user terminal, the radio base station transmits a UL grant to the user terminal.
  • the user terminal starts UL data using the UL resource allocated by the UL grant.
  • the random access procedure can be started autonomously.
  • UL data is transmitted using UL resources allocated to the user terminal by the UL grant after UL synchronization is established, highly reliable UL transmission is possible.
  • future wireless communication systems for example, 5G, NR
  • 5G Fifth Generation
  • NR New Radio
  • future wireless communication systems are expected to realize various wireless communication services to satisfy different requirements (for example, ultra-high speed, large capacity, ultra-low delay, etc.).
  • requirements for example, ultra-high speed, large capacity, ultra-low delay, etc.
  • BF beam forming
  • 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.
  • parallel processing of inverse fast Fourier transform (IFFT: Inverse Fast Fourier Transform) / digital-analog conversion (DAC: Digital to Analog Converter) / RF (Radio Frequency) is required for the number of antenna ports (RF chains). Become. On the other hand, as many beams as the number of RF chains can be formed at an arbitrary timing.
  • 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. Specifically, in analog BF, only one beam can be formed at a time for each phase shifter.
  • a base station for example, called eNB (evolved Node B), BS (Base Station), etc.
  • a user terminal has only one phase shifter
  • one beam can be formed at a certain time.
  • eNB evolved Node B
  • BS Base Station
  • a hybrid BF configuration in which a digital BF and an analog BF are combined can also be used.
  • future wireless communication systems for example, 5G
  • 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 5G.
  • beam forming is not considered when the user terminal transmits the PRACH.
  • beam forming is considered for user terminals in addition to base stations in a random access procedure.
  • FIG. 2 is a diagram illustrating an example in which the user terminal applies beamforming to the UL signal.
  • the user terminal shown in FIG. 2 is a terminal that supports beamforming by a plurality of precoding.
  • the present invention can be realized by a terminal that supports beamforming by a plurality of precoding.
  • the user terminal shown in FIG. 2 generates four beams # 1 to # 4 when transmitting UL signals.
  • the UL signals transmitted by the beams # 1 to # 4 are expressed by the following equation (1).
  • Tx (k) r (k) * Tx0 (Formula 1)
  • Tx (k): Transmission UL signal (beam k) (K 1, 2,..., N: N is an integer equal to or smaller than the number of antennas)
  • the base station In the random access procedure of the 5G and NR system, it is necessary to consider beam forming on the user terminal side. For this reason, the base station needs to perform a sweep process when receiving the UL signal.
  • the base station does not know the number of transmission beams on the user terminal side, it is necessary to set the UL signal, for example, the PRACH transmission occasion (PRACH transmission timing) for the maximum number of beams of the user terminal.
  • PRACH transmission timing PRACH transmission timing
  • the transmission occasions for PRACH for eight. Therefore, when the maximum number of beams supported by the user terminal increases, the number of occasions increases and the band (radio resource) is compressed.
  • one aspect of the present invention is a user terminal that receives a DL signal transmitted from a radio base station, transmits a UL signal in a random access procedure, and controls transmission by applying beamforming to the UL signal.
  • a random access procedure can be performed in communication using beamforming in a future wireless communication system. To do it properly.
  • PRACH random access preamble
  • PRACH may be read as message 3, may be read as PRACH and message 3, or may be read as other UL signals.
  • the beam may be read as precoding.
  • FIG. 3 is a diagram illustrating an example when the base station applies beamforming to reception of the UL signal.
  • 4 and 5 are diagrams for explaining the PRACH transmission according to the first aspect.
  • a random access procedure (for example, PRACH transmission / reception) is performed between the base station shown in FIG. 3 and the user terminal shown in FIG.
  • the base station shown in FIG. 3 supports a plurality of receive beamformings by a plurality of precoding, and generates four beams # 1 to # 4 when receiving a UL signal.
  • the user terminal shown in FIG. 2 supports a plurality of beamformings (for example, 8 beams) by a plurality of precoding, and uses four beams # 1 to # 4 designated when transmitting a UL signal. Generate. Note that the number of beams of the base station and the number of beams of the user terminal are not limited to these, and can be set as appropriate.
  • the user terminal controls transmission by selecting at least one beam and / or transmission timing to be applied to the UL signal based on the DL signal.
  • the following description a case where two beams are used on the base station side and four beams are used on the user terminal side will be described as an example.
  • the base station transmits broadcast information (PBCH: Physical Broadcast Channel) with each beam (base station side beams # 1 to # 2).
  • PBCH Physical Broadcast Channel
  • the base station notifies the user terminal of information regarding a predetermined beam to be applied to the UL signal, for example, the beam number (in this case, beams # 1 to # 4) used by the user terminal or the weighted sequence vector by PBCH (in FIG. ST11).
  • Information on the predetermined beam applied to the UL signal is used in the user terminal for transmission of the UL signal to which the predetermined beam is applied.
  • the predetermined number of beams to be notified (set) to the user terminal can be one or plural (here, four).
  • information regarding a predetermined beam applied to the UL signal information regarding a plurality of beam candidates applied to the UL signal may be notified (set) to the user terminal.
  • the user terminal may select one or a plurality of beams from the notified beam candidates and apply them to the transmission of the UL signal.
  • the base station side beam and the PRACH transmission occasion can be set in association with each other. Specifically, as shown in FIG. 5, base station side beam # 1 used for PBCH transmission is associated with PRACH transmission occasions # 1 to # 4, and base station side beam # 2 is PRACH transmission occasion #. 5 to # 8.
  • the base station performs PRACH transmission occasions # 1 to ##.
  • the base station side beam # 1 waits for reception at timing 4
  • the base station side beam # 2 waits for reception at the timing of PRACH transmission occasions # 5 to # 8.
  • the PRACH transmission occasion means the transmission timing of the UL signal set corresponding to the DL signal received (or received and selected) by the user terminal.
  • the user terminal receives the PBCH (or PBCH and synchronization signal) transmitted from the base station, and measures the reception quality (reception power and / or SNR (Signal Noise Ratio), etc.) (ST12 in FIG. 4).
  • the user terminal selects a base station side beam based on the reception quality measurement result (ST13 in FIG. 4).
  • the PRACH transmission occasion is determined by selecting the base station side beam.
  • the beam having the highest reception quality (for example, the highest reception quality) may be selected, and a plurality of adjacent beams including the beam having the highest reception quality may be selected. Also good. Further, depending on operation and setting, all base station side beams may be selected without being based on the reception quality measurement result.
  • the user terminal transmits the PRACH in a predetermined time slot (PRACH transmission occasion) using the beams # 1 to # 4 notified by the selected base station side beam (ST14 in FIG. 4).
  • PRACH transmission occasion a predetermined time slot
  • the PRACH transmission occasions # 1 to # 4 are used to transmit the PRACH
  • the base station side beam # 2 is selected, the PRACH transmission occasion is selected.
  • PRACH is transmitted from # 5 to # 8.
  • base station side beam # 1 is selected and UE beams # 1 to # 4 are transmitted in PRACH transmission occasions # 1 to # 4 is shown.
  • FIG. 5 shows a case where the same UE beams # 1 to # 4 are designated for the base station beams # 1 and # 2, respectively, but the present invention is not limited to this. Different UE beams (such as beam number and / or beam index) may be specified between different base station beams.
  • the user terminal shows a case where the designated UE beams # 1 to # 4 are respectively applied to perform PRACH transmission. However, the user terminal selects a part of the designated four UE beams and performs PRACH transmission. May be.
  • the base station that has received the PRACH records the PRACH detection availability and the designated beam numbers (here, beams # 1 to # 4) in each PRACH transmission occasion (ST15 in FIG. 4). Thereby, the base station can acquire information on a base station side beam index suitable for DL transmission (for example, PBCH) and UE beam index that can be suitably used for UL transmission in the user terminal. .
  • a base station side beam index suitable for DL transmission for example, PBCH
  • UE beam index that can be suitably used for UL transmission in the user terminal.
  • the number of occasions can be set without squeezing the bandwidth by designating the beam used for UL transmission on the base station side. Thereby, it is possible to appropriately perform a random access procedure in communication using beamforming.
  • the present invention is not limited to this, and the base station side beams are two.
  • the present invention can be similarly applied to cases where the number of beams on the user terminal side is not four.
  • FIG.6 and FIG.7 is a figure for demonstrating the PRACH transmission of a 2nd aspect.
  • the user terminal controls transmission by selecting at least one beam and / or transmission timing to be applied to the UL signal based on the DL signal.
  • the base station transmits PBCH.
  • the base station notifies the user terminal of information on a predetermined beam applied to the UL signal, for example, a beam number (in this case, beams # 1 to # 4) used by the user terminal or a weighted sequence vector by PBCH (ST21 in FIG. 6). ).
  • Information on the predetermined beam applied to the UL signal is used in the user terminal for transmission of the UL signal to which the predetermined beam is applied.
  • the predetermined number of beams to be notified (set) to the user terminal can be one or plural (here, four).
  • information regarding a predetermined beam applied to the UL signal information regarding a plurality of beam candidates applied to the UL signal may be notified (set) to the user terminal.
  • the user terminal may select one or a plurality of beams from the notified beam candidates and apply them to the transmission of the UL signal.
  • the user terminal receives the PBCH transmitted from the base station. Since the beam number used by the user terminal is included in the PBCH, the user terminal can know the beam used for PRACH transmission.
  • the user terminal transmits the PRACH using beams (beams # 1 to # 4) notified from the base station at a predetermined timing (PRACH transmission occasion) (ST22 in FIG. 6). In this case, as shown in FIG. 7, PRACH is transmitted using PRACH transmission occasions # 1 to # 4.
  • the base station that has received the PRACH records the PRACH detection availability and the designated beam numbers (here, beams # 1 to # 4) (ST23 in FIG. 6). Thereby, the base station can acquire UE beam index information that can be suitably used by the user terminal for UL transmission.
  • the number of occasions can be set without squeezing the bandwidth by designating the beam used for UL transmission on the base station side. Thereby, it is possible to appropriately perform a random access procedure in communication using beamforming.
  • the present invention is not limited to this, and the present invention is similarly applied to cases where there are four user terminal side beams. be able to.
  • the case where the UL signal in the random access procedure is PRACH has been described.
  • the case where the UL signal in the random access procedure is message 3 is also described. The same can be applied.
  • the beam number or weighting sequence vector used by the user terminal can be notified by PBCH and / or message 2.
  • the PRACH described above shows a collision type (contention-based) random access procedure
  • the present embodiment can also be applied to a non-collision type (non-contention base) random access procedure.
  • the user terminal may be notified of the beam number or weighting sequence vector used by the user terminal using the message 0.
  • the case where PRACH transmission is performed using the beams (beams # 1 to # 4) specified on the base station side has been described, but in the present embodiment, it is specified on the base station side.
  • the present invention can also be applied to the case where PRACH transmission is performed using a predetermined beam selected by the user terminal from the beam.
  • the user terminal can select a beam to be applied to PRACH transmission from a plurality of beams designated from the base station side by a method such as random or round robin.
  • the number of occasions can be set without further compressing the bandwidth on the base station side, and the random access procedure can be appropriately performed in communication using beam forming. it can.
  • wireless communication system Wireless communication system
  • the radio communication method according to each of the above aspects is applied.
  • wireless communication method which concerns on each said aspect may be applied independently, respectively, and may be applied in combination.
  • the radio communication system receives a DL signal transmitted from a radio base station, transmits a UL signal in a random access procedure, and applies a beam forming to the UL signal to control transmission.
  • a radio base station that transmits a DL signal to the user terminal and receives a random access preamble transmitted from the user terminal.
  • a radio base station transmits information specifying a beam to be applied to beam forming of a random access preamble by a user terminal in a DL signal, and the user terminal applies the UL signal based on the DL signal. Transmission is controlled with at least one beam and / or transmission timing.
  • the DL signal may include information on a predetermined beam applied to the UL signal, and the transmission of the UL signal may be controlled by applying the predetermined beam.
  • the DL signal includes information on beam candidates to be applied to the UL signal, and one or a plurality of beams may be selected from the beam candidates to control transmission of the UL signal.
  • the user terminal may control transmission by applying one or more beams to the UL signal at a transmission timing corresponding to the received DL signal.
  • FIG. 8 is a diagram illustrating an example of a schematic configuration of the wireless communication system according to the present embodiment.
  • 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.
  • the wireless communication system 1 may be called SUPER 3G, LTE-A (LTE-Advanced), IMT-Advanced, 4G, 5G, FRA (Future Radio Access), NR (New Rat), or the like.
  • the radio communication system 1 shown in FIG. 8 includes a radio base station 11 that forms a macro cell C1, and radio base stations 12a to 12c that are arranged in the macro cell C1 and form a small cell C2 that is narrower than the macro cell C1. .
  • 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 that use different frequencies simultaneously by CA or DC. In addition, the user terminal 20 can apply CA or DC using a plurality of cells (CC) (for example, two or more CCs). Further, the user terminal can use the license band CC and the unlicensed band CC as a plurality of cells. In addition, it can be set as the structure by which the TDD carrier which applies shortening TTI is contained in either of several cells.
  • CC cells
  • Communication between the user terminal 20 and the radio base station 11 can be performed using a carrier having a relatively low frequency band (for example, 2 GHz) and a narrow bandwidth (referred to as an existing carrier or a legacy carrier).
  • a carrier having a wide bandwidth in a relatively high frequency band for example, 3.5 GHz, 5 GHz, 30 to 70 GHz, etc.
  • the same carrier as that between the base station 11 and the base station 11 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 or the like.
  • 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 but also a fixed communication terminal.
  • OFDMA orthogonal frequency division multiple access
  • 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 OFDMA may be used in the UL.
  • DL channels DL data channels (PDSCH: Physical Downlink Shared Channel, also referred to as DL shared channel) shared by each user terminal 20, broadcast channels (PBCH: Physical Broadcast Channel), L1 / L2 A control channel or the like is used.
  • PDSCH Physical Downlink Shared Channel
  • PBCH Physical Broadcast Channel
  • SIB System Information Block
  • MIB Master Information Block
  • L1 / L2 control channels include DL control channels (PDCCH (Physical Downlink Control Channel), EPDCCH (Enhanced Physical Downlink Control Channel)), PCFICH (Physical Control Format Indicator Channel), PHICH (Physical Hybrid-ARQ Indicator Channel), etc. .
  • Downlink control information (DCI: Downlink Control Information) including PDSCH and PUSCH scheduling information is transmitted by the PDCCH.
  • the number of OFDM symbols used for PDCCH is transmitted by PCFICH.
  • the EPDCCH is frequency-division multiplexed with the PDSCH, and is used for transmission of DCI and the like as with the PDCCH.
  • HARQ retransmission indication information (ACK / NACK) for PUSCH can be transmitted by at least one of PHICH, PDCCH, and EPDCCH.
  • a UL data channel (PUSCH: Physical Uplink Shared Channel, also referred to as a UL shared channel) shared by each user terminal 20, a UL control channel (PUCCH: Physical Uplink Control Channel), random An access channel (PRACH: Physical Random Access Channel) or the like is used.
  • PUSCH Physical Uplink Shared Channel
  • PUCCH Physical Uplink Control Channel
  • PRACH Physical Random Access Channel
  • User data and higher layer control information are transmitted by the PUSCH.
  • Uplink control information including at least one of retransmission instruction information (ACK / NACK) and channel state information (CSI) is transmitted by PUSCH or PUCCH.
  • the PRACH can transmit a random access preamble for establishing a connection with a cell.
  • FIG. 9 is a diagram illustrating an example of the overall configuration of the radio base station according to the present embodiment.
  • 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.
  • DL data transmitted from the radio base station 10 to the user terminal 20 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 for example, transmission format selection, channel coding, inverse fast Fourier transform (IFFT) processing, precoding processing, and other transmission processing
  • IFFT inverse fast Fourier transform
  • the DL control signal is also subjected to transmission processing such as channel coding and inverse fast Fourier transform, and 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 UL signal amplified by the amplifier unit 102.
  • the transmission / reception unit 103 converts the frequency of the received signal into a baseband signal and outputs it to the baseband signal processing unit 104.
  • the baseband signal processing unit 104 performs Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing, and error correction on user data included in the input UL signal. Decoding, MAC retransmission control reception processing, RLC layer and PDCP layer reception processing are performed and transferred to the upper station apparatus 30 via the transmission path interface 106.
  • the call processing unit 105 performs call processing such as communication channel setting and release, status management of the radio base station 10, and radio resource management.
  • the transmission path interface 106 transmits and receives signals to and from the higher station apparatus 30 via a predetermined interface.
  • the transmission path interface 106 transmits / receives signals (backhaul signaling) to / from other radio base stations 10 via an interface between base stations (for example, an optical fiber compliant with CPRI (Common Public Radio Interface), X2 interface). May be.
  • CPRI Common Public Radio Interface
  • X2 interface May be.
  • the transmission / reception unit 103 may further include an analog beam forming unit that performs analog beam forming.
  • the analog beam forming unit includes an analog beam forming circuit (for example, phase shifter, phase shift circuit) or an analog beam forming apparatus (for example, phase shifter) described based on common recognition in the technical field according to the present invention. can do.
  • the transmission / reception antenna 101 can be configured by an array antenna, for example.
  • the transmission / reception unit 103 includes a DL signal (eg, DL control signal (DL control channel), DL data signal (DL data channel, DL shared channel), DL reference signal (DM-RS, CSI-RS, etc.), discovery signal, and the like. , Synchronization signals, broadcast signals, etc.) and UL signals (eg, UL control signals (UL control channels), UL data signals (UL data channels, UL shared channels), UL reference signals, etc.) are received.
  • DL signal eg, DL control signal (DL control channel), DL data signal (DL data channel, DL shared channel), DL reference signal (DM-RS, CSI-RS, etc.), discovery signal, and the like.
  • UL signals eg, UL control signals (UL control channels), UL data signals (UL data channels, UL shared channels), UL reference signals, etc.
  • the transmission / reception unit 103 transmits information on the PRACH used by the user terminal.
  • the PRACH information includes, for example, bit information specifying the format of the preamble format, information indicating the subcarrier interval, information indicating the number of repetitions, and the like.
  • the transmission / reception unit 103 transmits message 2, message 4, UL grant, and the like to the user terminal 20 at the time of random access.
  • the transmission / reception unit 103 receives PRACH, message 3, ACK, and the like from the user terminal 20 during random access.
  • the PRACH information may be set semi-statically by higher layer signaling such as RRC (Radio Resource Control) signaling or broadcast information, or dynamically by physical layer control information (L1 / L2 control channel). May be changed. Alternatively, it may be changed by a combination of higher layer signaling and physical layer control information.
  • the transmission / reception unit 103 transmits information related to a predetermined beam applied to the UL signal (for example, a beam number or a weighted sequence vector used by the user terminal) and information related to a beam candidate applied to the UL signal to the user terminal.
  • a predetermined beam applied to the UL signal for example, a beam number or a weighted sequence vector used by the user terminal
  • the transmission unit and the reception unit of the present invention are configured by the transmission / reception unit 103 and / or the transmission path interface 106.
  • FIG. 10 is a diagram illustrating an example of a functional configuration of the radio base station according to the present embodiment. Note that FIG. 10 mainly shows functional blocks of characteristic portions in the present embodiment, and the wireless base station 10 also has other functional blocks necessary for wireless communication. As illustrated in FIG. 10, the baseband signal processing unit 104 includes at least a control unit 301, a transmission signal generation unit 302, a mapping unit 303, a reception signal processing unit 304, and a measurement unit 305.
  • the control unit 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 signal generation by the transmission signal generation unit 302 and signal allocation by the mapping unit 303, for example.
  • the control unit 301 also controls signal reception processing by the reception signal processing unit 304 and signal measurement by the measurement unit 305.
  • the control unit 301 controls scheduling (for example, resource allocation) of DL signals and / or UL signals. Specifically, the control unit 301 generates and transmits a DCI (DL assignment) including scheduling information of the DL data channel and a DCI (UL grant) including scheduling information of the UL data channel. 302, the mapping unit 303, and the transmission / reception unit 103 are controlled.
  • a DCI DL assignment
  • a DCI UL grant
  • the control unit 301 controls the random access procedure. That is, the control unit 301 controls the random access procedure shown in FIG.
  • the control unit 301 detects the PRACH and records the detection availability and the beam number designated for the user terminal.
  • the transmission signal generation unit 302 generates a DL signal (DL reference signal such as DL control channel, DL data channel, DM-RS, etc.) based on an instruction from the control unit 301 and outputs the DL signal 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 mapping unit 303 maps the DL 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 the DL signal 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, a UL signal (UL control channel, UL data channel, UL 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.
  • the reception processing unit 304 outputs at least one of control information and UL data to the control unit 301.
  • the reception signal processing unit 304 outputs the reception signal and the signal after reception processing to the measurement unit 305.
  • the measurement unit 305 performs measurement on the received signal.
  • the measurement part 305 can be comprised from the measuring device, measurement circuit, or measurement apparatus demonstrated based on common recognition in the technical field which concerns on this invention.
  • the measurement unit 305 may measure, for example, the received power (for example, RSRP (Reference Signal Received Power)), reception quality (for example, RSRQ (Reference Signal Received Quality)), channel state, and the like of the received signal.
  • the measurement result may be output to the control unit 301.
  • FIG. 11 is a diagram illustrating an example of the overall configuration of the user terminal according to the present embodiment.
  • 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 DL 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 DL 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. Of the DL data, system information and higher layer control information are also transferred to the application unit 205.
  • UL data is input from the application unit 205 to the baseband signal processing unit 204.
  • the baseband signal processing unit 204 performs transmission / reception by performing retransmission control transmission processing (for example, HARQ transmission processing), channel coding, precoding, discrete Fourier transform (DFT) processing, IFFT processing, and the like. Is transferred to the unit 203.
  • retransmission control transmission processing for example, HARQ transmission processing
  • channel coding for example, channel coding, precoding, discrete Fourier transform (DFT) processing, IFFT processing, and the like.
  • DFT discrete Fourier transform
  • IFFT processing IFFT processing
  • the transmission / reception unit 203 converts the baseband signal output from the baseband signal processing unit 204 into a radio frequency band and transmits it.
  • the radio frequency signal frequency-converted by the transmission / reception unit 203 is amplified by the amplifier unit 202 and transmitted from the transmission / reception antenna 201.
  • the transmission / reception unit 203 may further include an analog beam forming unit that performs analog beam forming.
  • the analog beam forming unit includes an analog beam forming circuit (for example, phase shifter, phase shift circuit) or an analog beam forming apparatus (for example, phase shifter) described based on common recognition in the technical field according to the present invention. can do.
  • the transmission / reception antenna 201 can be configured by, for example, an array antenna.
  • the transmission / reception unit 203 includes a DL signal (eg, DL control signal (DL control channel), DL data signal (DL data channel, DL shared channel), DL reference signal (DM-RS, CSI-RS, etc.), discovery signal, synchronization Signals, broadcast signals, etc.) are received, and UL signals (for example, UL control signals (UL control channels), UL data signals (UL data channels, UL shared channels), UL reference signals, etc.) are transmitted.
  • DL signal eg, DL control signal (DL control channel), DL data signal (DL data channel, DL shared channel), DL reference signal (DM-RS, CSI-RS, etc.), discovery signal, synchronization Signals, broadcast signals, etc.
  • UL signals for example, UL control signals (UL control channels), UL data signals (UL data channels, UL shared channels), UL reference signals, etc.
  • the transmission / reception unit 203 receives PRACH information used by the user terminal.
  • the PRACH information includes, for example, bit information specifying the format of the preamble format, information indicating the subcarrier interval, information indicating the number of repetitions, and the like.
  • the transmission / reception unit 203 receives message 2, message 4, UL grant, and the like from the user terminal 20 at the time of random access.
  • the transmission / reception unit 203 transmits a random access preamble, a message 3, an ACK, and the like to the user terminal 20 at the time of random access. In this case, the transmission / reception unit 203 may repeatedly transmit the random access preamble.
  • the transmission / reception unit 203 receives information on a predetermined beam applied to the UL signal (for example, a beam number or a weighted sequence vector used by the user terminal) and information on a beam candidate applied to the UL signal.
  • a predetermined beam applied to the UL signal for example, a beam number or a weighted sequence vector used by the user terminal
  • FIG. 12 is a diagram illustrating an example of a functional configuration of the user terminal according to the present embodiment. Note that FIG. 12 mainly shows functional blocks of characteristic portions in the present embodiment, and the user terminal 20 also has other functional blocks necessary for wireless communication. As illustrated in FIG. 12, the baseband signal processing unit 204 included in the user terminal 20 includes 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. At least.
  • the control unit 401 controls the entire user terminal 20.
  • the control unit 401 can be composed of a controller, a control circuit, or a control device described based on common recognition in the technical field according to the present invention.
  • the control unit 401 controls, for example, signal generation by the transmission signal generation unit 402 and signal allocation by the mapping unit 403.
  • the control unit 401 controls signal reception processing by the reception signal processing unit 404 and signal measurement by the measurement unit 405.
  • the control unit 401 acquires the DL control channel and the DL data channel transmitted from the radio base station 10 from the received signal processing unit 404. Specifically, the control unit 401 blindly decodes the DL control channel to detect DCI, and controls the transmission / reception unit 203 and the received signal processing unit 404 to receive the DL data channel based on the DCI. Further, the control unit 401 estimates the channel gain based on the DL reference signal, and demodulates the DL data channel based on the estimated channel gain.
  • the control unit 401 controls transmission of retransmission control information (for example, HARQ-ACK, etc.) transmitted on the UL control channel or the UL data channel based on the result of determining whether or not retransmission control is required for the DL data channel. May be. Moreover, the control part 401 may control transmission of the channel state information (CSI: Channel State Information) generated based on the DL reference signal.
  • CSI Channel State Information
  • the control unit 401 uses the beam notified from the radio base station 10 and controls to transmit the PRACH in a predetermined time slot (PRACH transmission occasion).
  • PRACH transmission occasion a predetermined time slot
  • the control unit 401 selects the base station side selected based on the reception quality measurement result of the DL signal measured by the measurement unit 405 Control is performed so as to transmit the PRACH in the PRACH transmission occasion associated with the beam.
  • FIG. 5 when the base station side beam # 1 is selected, the PRACH transmission occasions # 1 to # 4 are transmitted, and when the base station side beam # 2 is selected, the PRACH transmission occasions # 5 to # 4 are selected.
  • the PRACH is transmitted at # 8.
  • the transmission signal generation unit 402 generates a UL signal (UL control channel, UL data channel, UL reference signal, etc.) based on an instruction from the control unit 401, and outputs the UL 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 a UL data channel based on an instruction from the control unit 401. For example, when the UL grant is included in the DL control channel notified from the radio base station 10, the transmission signal generation unit 402 is instructed by the control unit 401 to generate a UL data channel.
  • the mapping unit 403 maps the UL signal generated by the transmission signal generation unit 402 to a radio resource based on an instruction from the control unit 401, and outputs it 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 DL signal (DL control channel, DL data channel, DL 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 received signal processing unit 404 performs blind decoding on the DL control channel that schedules transmission and / or reception of the DL data channel based on an instruction from the control unit 401, and performs DL data channel reception processing based on the DCI.
  • Received signal processing section 404 estimates the channel gain based on DM-RS or CRS, and demodulates the DL data channel based on the estimated channel gain.
  • the reception signal processing unit 404 outputs the information decoded by the reception processing to the control unit 401.
  • the reception signal processing unit 404 outputs broadcast information, system information, RRC signaling, DCI, and the like to the control unit 401, for example.
  • the reception signal processing unit 404 may output the data decoding result to the control unit 401.
  • the reception signal processing unit 404 outputs the reception signal and the signal after reception processing to the measurement unit 405.
  • the measuring unit 405 measures the reception quality (reception power, SNR (Signal Noise Ratio), etc.) of the DL signal (synchronization signal and / or broadcast signal, etc.).
  • the measurement part 405 can be comprised from the measuring device, measurement circuit, or measurement apparatus demonstrated based on common recognition in the technical field which concerns on this invention.
  • the measurement unit 405 may measure, for example, the received power (for example, RSRP), DL reception quality (for example, RSRQ), channel state, and the like of the received signal.
  • the measurement result may be output to the control unit 401.
  • each functional block may be realized by one device physically and / or logically coupled, and two or more devices physically and / or logically separated may be directly and / or indirectly. (For example, wired and / or wireless) and may be realized by these plural devices.
  • the radio base station, user terminal, and the like in the present embodiment may function as a computer that performs processing of the radio communication method of the present invention.
  • FIG. 13 is a diagram illustrating an example of a hardware configuration of the radio base station and the user terminal according to the present embodiment.
  • 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 is performed by, for example, reading predetermined software (program) on hardware such as the processor 1001 and the memory 1002, and the processor 1001 performs computation, and communication by the communication device 1004 is performed. Alternatively, it is realized by controlling data reading and / or writing in the memory 1002 and the storage 1003.
  • the processor 1001 controls the entire computer by operating an operating system, for example.
  • the processor 1001 may be configured by a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, a register, and the like.
  • CPU central processing unit
  • the baseband signal processing unit 104 (204), the call processing unit 105, and the like 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 referred to as 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 external input.
  • the output device 1006 is an output device (for example, a display, a speaker, an LED (Light Emitting Diode) lamp, etc.) that performs output to the outside.
  • the input device 1005 and the output device 1006 may have an integrated configuration (for example, a touch panel).
  • each device such as the processor 1001 and the memory 1002 is connected by a bus 1007 for communicating information.
  • the bus 1007 may be configured with a single bus or may be configured with different buses between apparatuses.
  • the radio base station 10 and the user terminal 20 include a microprocessor, a digital signal processor (DSP), an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), an FPGA (Field Programmable Gate Array), and the like. It may be configured including hardware, and a part or all of each functional block may be realized by the hardware. For example, the processor 1001 may be implemented by at least one of these hardware.
  • DSP digital signal processor
  • ASIC Application Specific Integrated Circuit
  • PLD Programmable Logic Device
  • FPGA Field Programmable Gate Array
  • the channel and / or symbol may be a signal (signaling).
  • the signal may be a message.
  • the reference signal may be abbreviated as RS (Reference Signal), and may be referred to as a pilot, a pilot signal, or the like depending on an applied standard.
  • a component carrier CC: Component Carrier
  • CC Component Carrier
  • the radio frame may be configured with one or a plurality of periods (frames) in the time domain.
  • Each of the one or more periods (frames) constituting the radio frame may be referred to as a subframe.
  • a subframe may be composed of one or more slots in the time domain.
  • the slot may be configured with one or a plurality of symbols (OFDM (Orthogonal Frequency Division Multiplexing) symbol, SC-FDMA (Single Carrier Frequency Division Multiple Access) symbol, etc.) in the time domain).
  • OFDM Orthogonal Frequency Division Multiplexing
  • SC-FDMA Single Carrier Frequency Division Multiple Access
  • the radio frame, subframe, slot, and symbol all represent a time unit when transmitting a signal.
  • Different names may be used for the radio frame, the subframe, the slot, and the symbol.
  • one subframe may be referred to as a transmission time interval (TTI)
  • a plurality of consecutive subframes may be referred to as a TTI
  • one slot may be referred to as a TTI.
  • the subframe or TTI may be a subframe (1 ms) in the existing LTE, a period shorter than 1 ms (for example, 1-13 symbols), or a period longer than 1 ms. Also good.
  • TTI means, for example, a minimum time unit for scheduling in wireless communication.
  • a radio base station performs scheduling to allocate radio resources (frequency bandwidth, transmission power, etc. that can be used in each user terminal) to each user terminal in units of TTI.
  • the definition of TTI is not limited to this.
  • the TTI may be a transmission time unit of a channel-encoded data packet (transport block), or may be a processing unit such as scheduling or link adaptation.
  • a TTI having a time length of 1 ms may be called a normal TTI (TTI in LTE Rel. 8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, a long subframe, or the like.
  • a TTI shorter than a normal TTI may be called a shortened TTI, a short TTI, a shortened subframe, a short subframe, or the like.
  • a resource block is a resource allocation unit in the time domain and the frequency domain, and may include one or a plurality of continuous subcarriers (subcarriers) in the frequency domain. Further, the RB may include one or a plurality of symbols in the time domain, and may have a length of one slot, one subframe, or 1 TTI. One TTI and one subframe may each be composed of one or a plurality of resource blocks.
  • the RB may be called a physical resource block (PRB: Physical RB), a PRB pair, an RB pair, or the like.
  • the resource block may be composed of one or a plurality of resource elements (RE: Resource Element).
  • RE Resource Element
  • 1RE may be a radio resource region of 1 subcarrier and 1 symbol.
  • the structure of the above-described radio frame, subframe, slot, symbol, and the like is merely an example.
  • the configuration such as the cyclic prefix (CP) length can be variously changed.
  • information, parameters, and the like described in this specification may be represented by absolute values, may be represented by relative values from predetermined values, or may be represented by other corresponding information.
  • the radio resource may be indicated by a predetermined index.
  • the mathematical formulas and the like using these parameters may be different from those explicitly disclosed herein.
  • 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, and the like may be stored in a specific location (for example, a memory) or managed by a management table. Input / output information, signals, and the like can be overwritten, updated, or added. The output information, signals, etc. may be deleted. Input information, signals, and the like may be transmitted to other devices.
  • information notification includes physical layer signaling (eg, downlink control information (DCI), uplink control information (UCI)), upper layer signaling (eg, RRC (Radio Resource Control) signaling), It may be implemented by broadcast information (master information block (MIB), system information block (SIB), etc.), MAC (Medium Access Control) signaling), other signals, or a combination thereof.
  • DCI downlink control information
  • UCI uplink control information
  • RRC Radio Resource Control
  • MIB master information block
  • SIB system information block
  • MAC Medium Access Control
  • the physical layer signaling may be referred to as L1 / L2 (Layer 1 / Layer 2) control information (L1 / L2 control signal), L1 control information (L1 control signal), or the like.
  • the RRC signaling may be referred to as an RRC message, and may be, for example, an RRC connection setup (RRCConnectionSetup) message, an RRC connection reconfiguration (RRCConnectionReconfiguration) message, or the like.
  • the MAC signaling may be notified by, for example, a MAC control element (MAC CE (Control Element)).
  • notification of predetermined information is not limited to explicitly performed, but implicitly (for example, by not performing notification of the predetermined information or another (By notification of information).
  • the determination may be performed by a value represented by 1 bit (0 or 1), or may be performed by a boolean value represented by true or false.
  • the comparison may be performed by numerical comparison (for example, comparison with a predetermined value).
  • software, instructions, information, etc. may be transmitted / received via a transmission medium.
  • software can use websites, servers using wired technology (coaxial cable, optical fiber cable, twisted pair, digital subscriber line (DSL), etc.) and / or wireless technology (infrared, microwave, etc.) , Or other remote sources, these wired and / or wireless technologies are included within the definition of transmission media.
  • system and “network” used in this specification are used interchangeably.
  • base station BS
  • radio base station eNB
  • cell e.g., a fixed station
  • eNodeB eNodeB
  • cell group e.g., a cell
  • carrier femtocell
  • component carrier e.g., a fixed station, NodeB, eNodeB (eNB), access point, transmission point, reception point, femtocell, small cell, and the like.
  • 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, small cell, and the like.
  • 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 the operation can be performed by MME (Mobility Management Entity), S-GW (Serving-Gateway), etc., but not limited to these) 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 the present 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 “determine” (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”.
  • “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.
  • the terms “connected”, “coupled”, or any variation thereof refers to any direct or indirect connection between two or more elements or By coupling, it can include the presence of one or more intermediate elements between two elements that are “connected” or “coupled” to each other.
  • the coupling or connection between the elements may be physical, logical, or a combination thereof.
  • the two elements are radio frequency by using one or more wires, cables and / or printed electrical connections, and as some non-limiting and non-inclusive examples
  • electromagnetic energy such as electromagnetic energy having wavelengths in the region, the microwave region and the light (both visible and invisible) region can be considered “connected” or “coupled” to each other.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'objectif de la présente invention est d'effectuer une procédure d'accès aléatoire lors d'une communication à l'aide d'une formation de faisceau appropriée dans un futur système de communication sans fil. L'équipement utilisateur selon l'invention est caractérisé en ce qu'il comprend : une unité de réception qui reçoit un signal DL émis à partir d'une station de base radio; une unité d'émission qui émet un signal UL dans une procédure d'accès aléatoire; et une unité de commande qui commande l'émission en appliquant une formation de faisceau sur le signal UL; l'unité de commande commandant l'émission à l'aide d'au moins un faisceau appliqué sur le signal UL sur la base du signal DL et/ou de la synchronisation de transmission.
PCT/JP2017/046557 2016-12-27 2017-12-26 Équipement utilisateur, station de base radio, et procédé de radiocommunication WO2018124026A1 (fr)

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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020031819A1 (fr) * 2018-08-09 2020-02-13 ソニー株式会社 Dispositif de communication sans fil, procédé de communication sans fil et programme d'ordinateur
CN112586053A (zh) * 2018-08-10 2021-03-30 株式会社Ntt都科摩 用户终端以及无线通信方法
CN112913290A (zh) * 2018-08-17 2021-06-04 株式会社Ntt都科摩 无线通信装置以及无线通信方法
CN112956249A (zh) * 2018-11-01 2021-06-11 株式会社Ntt都科摩 基站、用户装置以及发送方法
CN113243130A (zh) * 2018-12-20 2021-08-10 株式会社Ntt都科摩 无线节点以及无线通信方法
CN113303006A (zh) * 2019-01-18 2021-08-24 株式会社Ntt都科摩 用户设备和基站以及由用户设备、基站执行的方法
CN113366907A (zh) * 2019-02-01 2021-09-07 株式会社Ntt都科摩 用户装置以及基站装置
CN113424567A (zh) * 2018-12-21 2021-09-21 株式会社Ntt都科摩 用户终端以及无线通信方法
CN113455040A (zh) * 2019-02-21 2021-09-28 株式会社Ntt都科摩 用户装置
CN113692772A (zh) * 2019-02-15 2021-11-23 株式会社Ntt都科摩 用户终端
CN113711683A (zh) * 2019-02-15 2021-11-26 株式会社Ntt都科摩 用户终端以及无线通信方法
CN113711683B (zh) * 2019-02-15 2024-05-24 株式会社Ntt都科摩 终端、基站、系统以及无线通信方法

Non-Patent Citations (5)

* Cited by examiner, † Cited by third party
Title
ERICSSON: "Beamforming impact on random access", 3GPP TSG RAN WG2 #92 R2-1704099, 14 May 2017 (2017-05-14), XP051274707, Retrieved from the Internet <URL:http://www.3gpp.org/ftp/Meetings_3GPP_SYNC/RAN2/Docs/> *
LG ELECTRONICS ET AL.: "Discussion on RACH procedure without Tx/RX reciprocity", 3GPP TSG RAN WG1 #87 R1-1611797, 14 November 2016 (2016-11-14), XP051190722, Retrieved from the Internet <URL:http://www.3gpp.org/ftp/tsg_ran/WG1_RL1/TSGR1_87/Docs/> *
LG ELECTRONICS: "Discussion multi-TRP operation considering analog beamforming", 3GPP TSG RAN WG1 #87 R1-1611793, 14 November 2016 (2016-11-14), XP051190718, Retrieved from the Internet <URL:http://www.3gpp.org/ftp/tsg_ran/WG1_RL1/TSGR1_87/Docs/> *
SAMSUNG: "RACH design with and without beam reciprocity", 3GPP TSG-RAN WG1 #86B R1-1609118, 10 October 2016 (2016-10-10), XP051158431, Retrieved from the Internet <URL:© NPL / EPO http://www.3gpp.org/ftp/tsg_ran/WG1_RL1/TSGR1_86b/Docs/> *
SAMSUNG: "RACH resource for MSG1 transmission", 3GPP TSG RAN WG1 #87 R1-1612460, 14 November 2016 (2016-11-14), XP051189345, Retrieved from the Internet <URL:http://www.3gpp.org/ftp/tsg_ran/WG1_RL1/TSGR1_87/Docs/> *

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11917681B2 (en) 2018-08-09 2024-02-27 Sony Corporation Wireless communication device, wireless communication method, and computer program
WO2020031819A1 (fr) * 2018-08-09 2020-02-13 ソニー株式会社 Dispositif de communication sans fil, procédé de communication sans fil et programme d'ordinateur
CN112586053A (zh) * 2018-08-10 2021-03-30 株式会社Ntt都科摩 用户终端以及无线通信方法
CN112913290A (zh) * 2018-08-17 2021-06-04 株式会社Ntt都科摩 无线通信装置以及无线通信方法
CN112913290B (zh) * 2018-08-17 2024-04-02 株式会社Ntt都科摩 无线通信装置以及无线通信方法
CN112956249A (zh) * 2018-11-01 2021-06-11 株式会社Ntt都科摩 基站、用户装置以及发送方法
CN112956249B (zh) * 2018-11-01 2024-04-09 株式会社Ntt都科摩 基站、用户装置以及发送方法
CN113243130A (zh) * 2018-12-20 2021-08-10 株式会社Ntt都科摩 无线节点以及无线通信方法
CN113243130B (zh) * 2018-12-20 2024-04-19 株式会社Ntt都科摩 无线节点以及无线通信方法
CN113424567B (zh) * 2018-12-21 2024-03-12 株式会社Ntt都科摩 终端、无线通信方法以及系统
CN113424567A (zh) * 2018-12-21 2021-09-21 株式会社Ntt都科摩 用户终端以及无线通信方法
CN113303006A (zh) * 2019-01-18 2021-08-24 株式会社Ntt都科摩 用户设备和基站以及由用户设备、基站执行的方法
CN113366907A (zh) * 2019-02-01 2021-09-07 株式会社Ntt都科摩 用户装置以及基站装置
CN113711683A (zh) * 2019-02-15 2021-11-26 株式会社Ntt都科摩 用户终端以及无线通信方法
CN113692772A (zh) * 2019-02-15 2021-11-23 株式会社Ntt都科摩 用户终端
CN113692772B (zh) * 2019-02-15 2024-05-07 株式会社Ntt都科摩 用户终端
CN113711683B (zh) * 2019-02-15 2024-05-24 株式会社Ntt都科摩 终端、基站、系统以及无线通信方法
CN113455040A (zh) * 2019-02-21 2021-09-28 株式会社Ntt都科摩 用户装置
CN113455040B (zh) * 2019-02-21 2024-03-29 株式会社Ntt都科摩 用户装置

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