WO2018084208A1 - Terminal utilisateur et procédé de communication sans fil - Google Patents

Terminal utilisateur et procédé de communication sans fil Download PDF

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Publication number
WO2018084208A1
WO2018084208A1 PCT/JP2017/039623 JP2017039623W WO2018084208A1 WO 2018084208 A1 WO2018084208 A1 WO 2018084208A1 JP 2017039623 W JP2017039623 W JP 2017039623W WO 2018084208 A1 WO2018084208 A1 WO 2018084208A1
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WIPO (PCT)
Prior art keywords
random access
user terminal
transmission
unit
base station
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PCT/JP2017/039623
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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 WO2018084208A1 publication Critical patent/WO2018084208A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J13/00—Code division multiplex systems
    • H04J13/16—Code allocation
    • H04J13/22—Allocation of codes with a zero correlation zone
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA

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
  • 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
  • M2M Machine-to-Machine
  • URLLC Ultra-reliable and Low Latency Communication
  • the neurology is a communication parameter (for example, subcarrier interval, bandwidth, symbol length, CP (Cyclic Prefix) length, TTI length, per TTI) in both the frequency direction and the time direction. The number of symbols, radio frame configuration, filtering process, windowing process, etc.).
  • the present invention has been made in view of such points, and in a future wireless communication system, a user terminal capable of suitably performing a random access procedure (for example, random access preamble transmission) while realizing flexible quality control.
  • a user terminal capable of suitably performing a random access procedure (for example, random access preamble transmission) while realizing flexible quality control.
  • Another object is to provide a wireless communication method.
  • a user terminal is a user terminal that communicates with a cell to which a predetermined neurology is applied, a generation unit that generates a random access preamble, and a transmission that transmits the random access preamble in the cell. And a control unit that controls the generation of the random access preamble by selecting a predetermined sequence length from a plurality of sequence lengths.
  • a random access procedure (for example, random access preamble transmission) can be suitably implemented while realizing flexible quality control in a future wireless communication system.
  • FIG. 1 It is a figure which shows an example of a collision type random access procedure. It is a figure which shows an example of a preamble format. 3A and 3B are diagrams illustrating an example of random access preambles having different sequence lengths. It is a figure which shows an example of the table utilized for transmission of a random access print. It is a figure which shows the other example of the table utilized for transmission of a random access print. It is a figure which shows the multiplexing example of a random access preamble. It is a schematic block diagram of the radio
  • 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.
  • the random access preamble (PRACH) transmitted by the user terminal is composed of a cyclic prefix (CP) section, a preamble section, and a guard time (GT) section. Also, four preamble formats that can be used by the user terminal for transmission of the random access preamble are defined.
  • preamble format 0 has a TTI length of 1 [ms], a CP interval of 102.6 [ ⁇ s], a preamble interval of 800 [ ⁇ s], and a GT interval of 97.4 [ ⁇ s]. And has a coverage of up to 15 [km].
  • Preamble format 1 has a TTI length of 2 [ms] or 3 [ms], has a CP interval of 684 [ ⁇ s], a preamble interval of 800 [ ⁇ s], and a GT interval of 516 [ ⁇ s], and has a TTI length Is 2 [ms], the maximum coverage is 77 [km], and when the TTI length is 3 [ms], the maximum coverage is 100 [km].
  • Preamble format 2 has a TTI length of 2 [ms], has a CP interval of 202.6 [ ⁇ s], a preamble interval of 2 ⁇ 800 [ ⁇ s], and a GT interval of 197.4 [ ⁇ s] It has a coverage of 30 [km].
  • Preamble format 3 has a TTI length of 3 [ms], has a CP interval of 684 [ ⁇ s], a preamble interval of 2 ⁇ 800 [ ⁇ s], and a GT interval of 716 [ ⁇ s], and a maximum of 100 [km] With coverage.
  • the subcarrier interval (SC spacing) of the random access preamble is defined as 1.25 kHz in the preamble format 0-3.
  • the sequence length (839) of the random access preamble is fixedly defined.
  • the neurology refers to a set of communication parameters (radio parameters) in both the frequency direction and / or the time direction.
  • the set of communication parameters includes, for example, at least one of a subcarrier interval, a bandwidth, a symbol length, a CP length, a TTI length, the number of symbols per TTI, a radio frame configuration, a filtering process, a windowing process, and the like. Also good.
  • nuemology is different means that, for example, at least one of subcarrier spacing, bandwidth, symbol length, CP length, TTI length, number of symbols per TTI, radio frame configuration, and the like is different between the nuemologies. Although shown, it is not limited to this.
  • the sequence length of the random access preamble was fixedly defined.
  • the frequency band to be used, the bandwidth, and the number of transmission / reception antennas vary widely. Also, a method for selecting a PRACH subcarrier interval according to the system bandwidth is discussed. In the high frequency band, a method of increasing reception sensitivity by increasing the number of antennas on the radio base station side is being discussed.
  • the present inventors prepare a plurality of PRACH sequence lengths, and determine a predetermined length according to the communication environment, for example, at least one of a frequency band to be used, a system band, a subcarrier interval, the number of transmission antenna ports, and a moving speed. It has been found that a random access procedure (for example, random access preamble transmission) is suitably implemented while realizing flexible quality control by selecting a sequence length and generating a PRACH.
  • a random access procedure for example, random access preamble transmission
  • a future wireless communication system by selecting a predetermined sequence length from a plurality of sequence lengths and controlling generation of a random access preamble, a future wireless communication system
  • the random access procedure (for example, random access preamble transmission) is preferably implemented while realizing flexible quality control.
  • 3A and 3B are diagrams illustrating examples of random access preambles having different preamble sequence lengths.
  • the random access preamble shown in FIG. 3A has a bandwidth of 1.04 MHz. This corresponds to 839 subcarriers having a subcarrier interval of 1.25 kHz. That is, the sequence length of this random access preamble is 839 (for example, the first sequence length: ZC (Zadoff-Chu) sequence), and the preamble length is 800 ⁇ s.
  • the random access preamble shown in FIG. 3B also has a bandwidth of 1.04 MHz. This corresponds to 419 subcarriers having a subcarrier interval of 1.25 kHz. That is, the sequence length of this random access preamble is 419 (for example, the second sequence length: ZC (Zadoff-Chu) sequence), and the preamble length is 800 ⁇ s.
  • the sequence length of the random access preamble shown in FIG. 3B is about 1 ⁇ 2 times the sequence length of the random access preamble shown in FIG. 3A.
  • a plurality of PRACH sequence lengths are prepared, and a user terminal determines a predetermined sequence according to at least one of a communication environment, for example, a frequency band to be used, a system band, a subcarrier interval, the number of transmission antenna ports, and a moving speed.
  • a length to generate a PRACH is not limited to the examples shown in FIGS. 3A and 3B, and can be set as appropriate.
  • 3A and 3B describe the case where two PRACH sequence lengths are prepared, the present invention is not limited to this, and the present invention can also be applied to the case where three or more PRACH sequence lengths are prepared. .
  • Bandwidth affects timing accuracy (timing offset estimation accuracy). Also, the subcarrier spacing and bandwidth affect capacity and collision potential. For example, when the subcarrier interval is wide, it is possible to effectively prevent channel-to-channel interference due to Doppler shift during movement of the user terminal and transmission quality degradation due to phase noise of the user terminal receiver. In particular, in a high frequency band such as several tens of GHz, it is possible to effectively prevent deterioration in transmission quality by widening the subcarrier interval.
  • the preamble length affects the SNR (Signal Noise Ratio) and the cell radius. For example, at a relatively low carrier frequency (for example, 6 GHz band or lower), priority is given to ensuring coverage, and the neurology shown in FIG. 3A having a narrow subcarrier interval similar to existing LTE is suitable.
  • SNR Signal Noise Ratio
  • the CP length is increased even when the ratio of the CP length to the total length of the preamble is constant. be able to. This enables stronger (robust) wireless communication against multipath fading in the communication path.
  • the neurology used by the user terminal may be set semi-statically by higher layer signaling such as RRC (Radio Resource Control) signaling and broadcast information, or physical layer control information (L1 / L2 control channel) May be changed dynamically. Alternatively, it may be changed by a combination of higher layer signaling and physical layer control information.
  • higher layer signaling such as RRC (Radio Resource Control) signaling and broadcast information
  • physical layer control information L1 / L2 control channel
  • a plurality of preamble sequences and sequence lengths may be defined and set in the UE.
  • a random access procedure (for example, PRACH transmission) can be suitably performed in a future wireless communication system.
  • the sequence length of the PRACH is preferably determined based on at least one of a frequency band to be used, a system band, a subcarrier interval, the number of transmission antenna ports, a moving speed, and the like. That is, in the user terminal, the PRACH sequence length is determined based on at least one of a frequency band to be used, a system band, a subcarrier interval, the number of transmission antenna ports, a moving speed, and the like.
  • the frequency band to be used when the frequency band to be used is higher, the frequency offset and the Doppler frequency due to movement may be relatively large, and the spread of the PRACH reception timing may be relatively wide.
  • the timing spread can be suppressed. Therefore, when the frequency band to be used is higher, it is better that the PRACH sequence length is longer.
  • the frequency band to be used is a lower frequency, the timing spread becomes narrower, so that the PRACH sequence length can be further shortened.
  • the system band when the system band is wider, it can be determined that the base station is likely to allow only a narrower range of reception timing spread, so it is better that the PRACH sequence length is longer.
  • the system band when the system band is narrower, it can be determined that there is a high possibility of allowing a wider range of reception timing, and therefore a shorter PRACH sequence length can be selected.
  • the subcarrier interval when the subcarrier interval is narrower, it can be determined that there is a high possibility that the spread of the reception timing is wider, so it is better that the PRACH sequence length is longer. On the other hand, when the subcarrier interval is wider, it can be determined that the spread of reception timing can be suppressed, so that a shorter PRACH sequence length can be selected.
  • the probability of collision between signals is relatively lowered by beam forming, so that a shorter PRACH sequence length can be selected.
  • the probability of collision between signals increases relatively, so that a longer PRACH sequence length is better.
  • the communication environment for example, channel state
  • the communication environment for example, channel state
  • the communication environment for example, Since the channel state is considered to be relatively bad, it is preferable to transmit the PRACH sequence length relatively long.
  • the PRACH sequence length is preferably determined based on the downlink signal measurement result (for example, received power). For example, when the downlink signal power is high, it is considered that the communication environment is good, so a PRACH having a relatively short sequence length is transmitted. On the other hand, when the power of the downlink signal is low, it is considered that the communication environment is bad, so a PRACH having a relatively long sequence length is transmitted.
  • the PRACH transmitted by the user terminal is composed of a cyclic prefix (CP) section, a preamble section, and a guard time (GT) section.
  • the configuration of PRACH is configured by at least the subcarrier interval and the number of preamble symbol repetitions. That is, in the above aspect, PRACH applying a predetermined subcarrier interval may be repeatedly transmitted. As a result, the SNR can be increased.
  • a preamble format is defined for PRACH corresponding to the new melology.
  • a PRACH preamble format corresponding to this neurology is also included in the present invention.
  • PRACH can be generated using a ZC (Zadoff-Chu) sequence having RACH ROOT SEQUENCE.
  • the RACH ROOT SEQUENCE is reported as system information from the radio base station. Or you may produce
  • the PRACH sequence length is preferably determined based on at least one of the frequency band to be used, the system band, the subcarrier interval, the number of transmission antenna ports, the moving speed, and the like.
  • the user terminal uses, for example, a PRACH sequence length using a table in which parameters relating to a communication environment such as a frequency band to be used, a system band, a subcarrier interval, the number of transmission antenna ports, and a moving speed are associated with a PRACH sequence length. Can be selected.
  • the user terminal generates a PRACH by selecting a predetermined combination from a table in which a plurality of combinations of subcarrier intervals and / or the number of repeated transmissions and PRACH sequence lengths are defined.
  • FIG. 4 is a diagram illustrating an example of a table used for PRACH transmission.
  • the parameters of the center frequency band, the subcarrier interval, and the moving speed are associated with the PRACH sequence length.
  • the user terminal preliminarily notifies or defines the table shown in FIG. 4 from the radio base station, and refers to this table to select the PRACH sequence length from the center frequency band, subcarrier interval, and moving speed.
  • the user terminal generates a PRACH with the selected PRACH sequence length.
  • the center frequency band and the subcarrier interval are selected by the user terminal or notified to the user terminal when communication is established, and the moving speed is measured at the user terminal.
  • FIG. 5 is a diagram illustrating another example of a table used for PRACH transmission.
  • the parameters of the center frequency band and the moving speed are associated with a combination of the subcarrier interval, the number of repeated transmissions, and the PRACH sequence length.
  • the table shown in FIG. 5 is notified in advance from the radio base station, and a combination of the subcarrier interval, the number of repeated transmissions, and the PRACH sequence length is selected from the center frequency band and the moving speed with reference to this table.
  • the user terminal generates a PRACH with the selected PRACH sequence length.
  • the center frequency band, the number of repeated transmissions, and the subcarrier interval are selected by the user terminal or notified to the user terminal when communication is established, and the moving speed is measured at the user terminal.
  • the radio base station can determine a predetermined length from a plurality of PRACH sequence lengths.
  • the PRACH sequence length may be selected and notified to the user terminal. 4 and 5 use the center frequency band, the subcarrier interval, the number of repeated transmissions, and the moving speed as parameters. However, the present invention is not limited to this, and other parameters and the PRACH sequence length are used. It may be related.
  • the user terminal selects the combination by associating the parameters of the center frequency band and the moving speed with the combination of the subcarrier interval, the number of repeated transmissions, and the PRACH sequence length. In the present application, selection of this combination means selection of the PRACH sequence length.
  • the present invention can be applied to both a collision type random access operation and a non-collision type random access operation.
  • information such as the PRACH sequence length may be notified from the radio base station to the user terminal.
  • a plurality of PRACHs having different PRACH sequence lengths can be time-multiplexed or frequency-multiplexed.
  • a random access preamble A having a bandwidth of about 0.5 MHz, a subcarrier interval of 1.25 kHz, a repetition number of 4 and a sequence length of 419, a bandwidth of about 0.5 MHz, a subcarrier interval of 1.25 kHz, and a repetition.
  • a random access preamble B having a sequence length of 419 and a random access preamble C having a bandwidth of about 1 MHz, a subcarrier interval of 1.25 kHz, a repetition number of 4, and a sequence length of 839 are shown.
  • random access preamble A and random access preamble B are time multiplexed
  • random access preambles A and B and random access preamble C are time and frequency multiplexed.
  • the multiplexing of the random access preamble is not limited to the example shown in FIG. 6, and can be set as appropriate.
  • a predefined bandwidth (one or more) may be set for the PRACH.
  • the user terminal can transmit suitable PRACH according to request conditions, such as time error estimation.
  • 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.
  • FIG. 7 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. 7 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. 8 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 about the neurology used by the user terminal.
  • the transmitting / receiving unit 103 transmits 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 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 may notify the user terminal 20 of the information in the table shown in FIG. 4 or 5 at the time of random access.
  • the transmission / reception unit 103 receives information on the PRACH sequence length and the PRACH sequence length and other parameters (for example, a frequency band to be used, a system band, a subcarrier interval, the number of transmission antenna ports, and a moving speed) during random access.
  • the combination information may be notified to the user terminal 20.
  • the transmission / reception unit 103 transmits setting information of a plurality of collision type resource areas having different parameters by at least one of system information, higher layer signaling, and DL control channel.
  • the setting information includes the number of time resources, the number of frequency resources, a parameter related to the number of repetitions, a parameter related to transmission processing, a parameter related to frequency hopping, resource group identification information, a parameter related to time and / or frequency position, and neurology. At least one of the parameters related to retransmission control may be included for each collision type resource region.
  • 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. 9 is a diagram illustrating an example of a functional configuration of the radio base station according to the present embodiment. Note that FIG. 9 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. 9, 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 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. 10 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.
  • 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.
  • the transmission / reception unit 203 transmits a random access preamble that applies a predetermined subcarrier interval from a random access preamble that supports a plurality of subcarrier intervals.
  • the transmission / reception unit 203 receives information about the neurology used by the user terminal.
  • 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 may receive the information of the table shown in FIG. 4 or 5 at the time of random access. In addition, the transmission / reception unit 203 performs random access to PRACH sequence length information and PRACH sequence length and other parameters (for example, a frequency band to be used, a system band, a subcarrier interval, the number of transmission antenna ports, and a moving speed). Combination information may be received.
  • the transmission / reception unit 203 receives setting information of a plurality of collision type resource areas having different parameters by at least one of system information, higher layer signaling, and DL control channel.
  • the setting information includes the number of time resources, the number of frequency resources, a parameter related to the number of repetitions, a parameter related to transmission processing, a parameter related to frequency hopping, a parameter related to preamble, a resource group identification information, a parameter related to time and / or frequency position.
  • At least one of the parameters related to the neurology and retransmission control may be included for each collision type resource region.
  • FIG. 11 is a diagram illustrating an example of a functional configuration of the user terminal according to the present embodiment. Note that FIG. 11 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.
  • 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 selects a random access preamble that applies a predetermined subcarrier interval from random access preambles that support a plurality of subcarrier intervals.
  • the control unit 401 generates a PRACH by determining a predetermined sequence length from a plurality of sequence lengths based on at least one of a frequency band to be used, a system band, a subcarrier interval, the number of transmission antenna ports, and a moving speed. To do.
  • the control unit 401 refers to the table shown in FIG. 4 or 5 and selects the PRACH sequence length using information on the parameters constituting the table to generate the PRACH.
  • the control unit 401 determines a predetermined sequence length from a plurality of sequence lengths based on the downlink signal measurement result measured by the measurement unit 405, and generates a PRACH.
  • 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 mapping unit 403 maps the random access preamble to the radio resource as shown in FIG. Specifically, as illustrated in FIG. 6, the mapping unit 403 maps the random access preamble to the radio resource by time multiplexing and / or frequency multiplexing.
  • 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 measurement unit 405 performs measurement on the received signal.
  • the measurement part 405 can be comprised from the measuring device, measurement circuit, or measurement apparatus demonstrated based on common recognition in the technical field which concerns on this invention.
  • the measurement unit 405 may 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. 12 is a diagram illustrating an example of the 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, and the like 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, fiber optic cable, twisted pair, digital subscriber line (DSL), etc.) and / or wireless technology (infrared, microwave, etc.) , Or other remote sources, these wired and / or wireless technologies are included within the definition of transmission media.
  • system and “network” used in this specification are used interchangeably.
  • base station BS
  • radio base station eNB
  • cell 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

La présente invention vise à mettre en oeuvre une procédure d'accès aléatoire (telle qu'une transmission de préambule d'accès aléatoire) d'une manière préférée et d'obtenir en même temps une commande de qualité flexible dans de futurs systèmes de communication sans fil. Le terminal utilisateur de la présente invention communique avec une cellule, dans laquelle des valeurs numériques prédéfinies sont appliquées. Le terminal utilisateur comprend : une unité de génération, qui génère un préambule d'accès aléatoire ; une unité de transmission, qui transmet le préambule d'accès aléatoire dans la cellule ; et une unité de commande, qui commande la génération du préambule d'accès aléatoire en sélectionnant une longueur de série prédéfinie parmi une pluralité de longueurs de série.
PCT/JP2017/039623 2016-11-02 2017-11-01 Terminal utilisateur et procédé de communication sans fil WO2018084208A1 (fr)

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JP2016-215569 2016-11-02

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CN112673689A (zh) * 2018-09-07 2021-04-16 株式会社Ntt都科摩 用户终端以及无线通信方法
CN112770404A (zh) * 2019-11-05 2021-05-07 华为技术有限公司 随机接入方法、装置及设备
CN112840575A (zh) * 2018-08-09 2021-05-25 株式会社Ntt都科摩 用户终端以及无线通信方法
CN113632518A (zh) * 2019-03-28 2021-11-09 株式会社Ntt都科摩 无线节点以及无线通信控制方法

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112602367A (zh) * 2018-06-28 2021-04-02 株式会社Ntt都科摩 用户终端
CN112840575A (zh) * 2018-08-09 2021-05-25 株式会社Ntt都科摩 用户终端以及无线通信方法
CN112840575B (zh) * 2018-08-09 2023-11-21 株式会社Ntt都科摩 用户终端以及无线通信方法
CN112673689A (zh) * 2018-09-07 2021-04-16 株式会社Ntt都科摩 用户终端以及无线通信方法
CN112369108A (zh) * 2018-12-28 2021-02-12 松下电器（美国）知识产权公司 发送装置、接收装置、发送方法及接收方法
CN113632518A (zh) * 2019-03-28 2021-11-09 株式会社Ntt都科摩 无线节点以及无线通信控制方法
CN113632518B (zh) * 2019-03-28 2024-02-02 株式会社Ntt都科摩 无线节点以及无线通信控制方法
CN112770404A (zh) * 2019-11-05 2021-05-07 华为技术有限公司 随机接入方法、装置及设备

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