WO2017135345A1 - Terminal d'utilisateur, station de base sans fil et procédé de communication sans fil - Google Patents

Terminal d'utilisateur, station de base sans fil et procédé de communication sans fil Download PDF

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Publication number
WO2017135345A1
WO2017135345A1 PCT/JP2017/003704 JP2017003704W WO2017135345A1 WO 2017135345 A1 WO2017135345 A1 WO 2017135345A1 JP 2017003704 W JP2017003704 W JP 2017003704W WO 2017135345 A1 WO2017135345 A1 WO 2017135345A1
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Prior art keywords
transmission
message
user terminal
unit
random access
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PCT/JP2017/003704
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English (en)
Japanese (ja)
Inventor
和晃 武田
聡 永田
高橋　秀明
ウリ アンダルマワンティ ハプサリ
徹 内野
チン ムー
Original Assignee
株式会社Ｎｔｔドコモ
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Application filed by 株式会社Ｎｔｔドコモ filed Critical 株式会社Ｎｔｔドコモ
Priority to CN201780009809.2A priority Critical patent/CN108605331A/zh
Publication of WO2017135345A1 publication Critical patent/WO2017135345A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • 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, 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-Advanced
  • FRA Full Radio Access
  • 4G, 5G, LTE Rel. 13, 14, 15 ⁇ LTE successor systems
  • inter-device communication M2M: Machine-to-Machine
  • MTC Machine Type Communication
  • 3GPP Third Generation Partnership Project
  • MTC user terminals MTC UE (User Equipment)
  • MTC UE User Equipment
  • 3GPP TS 36.300 “Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2”
  • 3GPP TR 36.888 “Study on provision of low-cost Machine-Type Communications (MTC) User Equipments (UEs) based on LTE (Release 12)”
  • MTC Machine-Type Communications
  • UEs User Equipments
  • LC-MTC Low-Cost -MTC terminal
  • LC-MTC UE LTE communication in a very narrow band
  • NB-IoT Near Band Internet of Things
  • NB-LTE Narrow Band LTE
  • NB cellular IoT Narrow Band cellular Internet of Things
  • NB-IoT described in this specification includes the above-mentioned NB-LTE, NB cellular IoT, clean slate, and the like.
  • NB-IoT terminals The bandwidth used by user terminals that support NB-IoT (hereinafter referred to as NB-IoT terminals) is narrower than the minimum system bandwidth (1.4 MHz) of existing LTE systems (for example, LTE systems prior to Rel.12). It is also assumed that the bandwidth is limited to, for example, 180 kHz, 1 resource block (RB: Resource Block, PRB: Physical Resource Block, etc.).
  • RB Resource Block
  • PRB Physical Resource Block
  • PRB which is a resource allocation unit in the LTE system It is assumed that resource allocation in smaller frequency units (for example, subcarrier units) is required.
  • the present invention has been made in view of the above point, and appropriately performs communication even when allocation is controlled in a frequency unit (for example, subcarrier unit) smaller than a resource allocation unit in an existing LTE system.
  • Another object is to provide a user terminal, a radio base station, and a radio communication method that can be used.
  • a user terminal includes a transmission unit that transmits a random access preamble (message 1) and a message 3 in a random access operation, a transmission parameter that is used for transmission of the message 1, and transmission of the message 3. And a controller that controls transmission of the message 1 and the message 3 in association with the number of subcarriers and / or subcarrier intervals to be used.
  • a transmission unit that transmits a random access preamble (message 1) and a message 3 in a random access operation, a transmission parameter that is used for transmission of the message 1, and transmission of the message 3.
  • a controller that controls transmission of the message 1 and the message 3 in association with the number of subcarriers and / or subcarrier intervals to be used.
  • communication can be appropriately performed even when the allocation is controlled in a frequency unit (for example, subcarrier unit) smaller than the resource allocation unit in the existing LTE system.
  • a frequency unit for example, subcarrier unit
  • NB-IoT terminals In NB-IoT terminals, it has been studied to allow a reduction in processing capability and simplify the hardware configuration. For example, in NB-IoT terminals, compared to existing user terminals (for example, LTE terminals before Rel.12), the peak rate is reduced, the transport block size (TBS) is limited, and the resource block (RB) : Resource Block, PRB (Physical Resource Block, etc.) restrictions, and RF (Radio Frequency) restrictions are being considered.
  • TSS transport block size
  • RB resource block
  • PRB Physical Resource Block, etc.
  • RF Radio Frequency
  • the upper limit of the use band of the NB-IoT terminal is a predetermined narrow band (NB: Narrow Band, For example, it is limited to 180 kHz and 1.4 MHz.
  • the predetermined narrow band is the same as the minimum system band (for example, 1.4 MHz, 6 PRB) of an existing LTE system (LTE system before Rel.12, hereinafter, also simply referred to as LTE system), or A part of the band (for example, 180 kHz, 1 PRB) may be used.
  • the NB-IoT terminal transmits and / or receives (hereinafter, referred to as a terminal having a narrower upper limit of the use band than the existing LTE terminal and a band narrower than the existing LTE terminal (for example, a band narrower than 1.4 MHz). It can also be said that the terminal is capable of transmitting and receiving).
  • this NB-IoT terminal is considered to operate within the system band of the LTE system.
  • frequency multiplexing may be supported between an NB-IoT terminal whose band is limited and an existing LTE terminal whose band is not limited.
  • NB-IoT may be operated using a guard band or a dedicated frequency between carriers adjacent to the LTE system band as well as within the LTE system band.
  • FIG. 1 is a diagram showing an arrangement example of a narrow band that is a use band of an NB-IoT terminal.
  • the use band of the NB-IoT terminal is set to a part of the system band (for example, 20 MHz) of the LTE system.
  • the use band of the NB-IoT terminal is set to 180 kHz, but the present invention is not limited to this.
  • the use band of the NB-IoT terminal may be narrower than the system band (for example, 20 MHz) of the LTE system.
  • the bandwidth may be equal to or less than 13 LC-MTC terminals (for example, 1.4 MHz).
  • the narrow band frequency position used as the use band of the NB-IoT terminal can be changed within the system band.
  • the NB-IoT terminal preferably communicates using different frequency resources for each predetermined period (for example, subframe).
  • the NB-IoT terminal preferably has an RF retuning function in consideration of application of frequency hopping and frequency scheduling.
  • the NB-IoT terminal may use different bands for downlink and uplink, or may use the same band.
  • a band used for downlink transmission / reception may be called a downlink narrow band (DL NB).
  • a band used for uplink transmission / reception may be called an uplink narrow band (UL NB).
  • the NB-IoT terminal receives downlink control information (DCI: Downlink Control Information) using a downlink control channel allocated in a narrow band.
  • DCI Downlink Control Information
  • the downlink control channel may be called PDCCH (Physical Downlink Control Channel), EPDCCH (Enhanced Physical Downlink Control Channel), M-PDCCH (MTC PDCCH), NB-PDCCH, etc. May be called.
  • the NB-IoT terminal receives downlink data using a downlink shared channel arranged in a narrow band.
  • the downlink shared channel may be called PDSCH (Physical Downlink Shared Channel), M-PDSCH (MTC PDSCH), NB-PDSCH, or the like.
  • the NB-IoT terminal uses an uplink control channel arranged in a narrow band, and transmits uplink control information (HARQ-ACK: Hybrid Automatic Repeat reQuest-ACKnowledge), channel state information (CSI: Channel State Information), etc.
  • Control information (UCI: Uplink Control Information) is transmitted.
  • the uplink control channel may be referred to as PUCCH (Physical Uplink Control Channel), or may be referred to as M-PUCCH (MTC PUCCH), NB-PUCCH, or the like.
  • the NB-IoT terminal receives UCI and / or uplink data using an uplink shared channel arranged in a narrow band.
  • the uplink shared channel may be called PUSCH (Physical Uplink Shared Channel), or may be called M-PUSCH (MTC PUSCH), NB-PUSCH, or the like.
  • the present invention is not limited to the above channels, and a conventional channel used for the same application may be represented by adding “M” indicating MTC, “N” indicating NB-IoT, or “NB”.
  • M MTC
  • N indicating NB-IoT
  • NB NB-IoT
  • the downlink control channel, downlink shared channel, uplink shared channel, and uplink shared channel used in the narrow band are referred to as PDCCH, PDSCH, PUCCH, and PUSCH, respectively, but as described above, the names are not limited to these. .
  • the same downlink signal eg, PDCCH, PDSCH, etc.
  • / or uplink signal eg, PUCCH, PUSCH, etc.
  • Transmission / reception may be performed.
  • the number of subframes in which the same downlink signal and / or uplink signal is transmitted / received is also referred to as a repetition number. Further, the number of repetitions may be indicated by a repetition level.
  • the repetition level may be referred to as a coverage enhancement (CE) level.
  • CE coverage enhancement
  • a tone is synonymous with a subcarrier and means each band obtained by dividing a use band (for example, 180 kHz, one resource block).
  • single tone transmission it has been studied to support the same subcarrier interval (that is, 15 kHz) as that of the existing LTE system and a subcarrier interval (for example, 3.75 kHz) that is narrower than that of the LTE system.
  • a subcarrier interval for example, 3.75 kHz
  • multi-tone transmission it is considered to support the same subcarrier interval (that is, 15 kHz) as the LTE system.
  • the subcarrier interval is 15 kHz
  • 1 PRB 180 kHz
  • 1 PRB is configured by 48 subcarriers.
  • the subcarrier interval applicable in the present embodiment is not limited to these.
  • the NB-IoT terminal performs uplink transmission (for example, PUSCH or / and PUCCH transmission) with the number of tones (subcarriers) notified from the radio base station. For example, ⁇ 1, 3, 6, 12 ⁇ can be considered as a combination of the numbers of tones. In this way, the number of tones selected from a predetermined combination is configured by higher layer signaling (for example, RRC (Radio Resource Control) signaling or broadcast information), and the NB-IoT terminal is configured. Uplink transmission may be performed with the set number of tones.
  • FIG. 2 is a diagram illustrating an example of a resource unit in NB-IoT.
  • ⁇ 1, 3, 6, 12 ⁇ is used as the combination of the number of tones (subcarriers)
  • the combination of the numbers of tones is not limited to this.
  • a combination of ⁇ 1, 2, 4, 12 ⁇ may be used.
  • the time unit of one resource unit is changed according to the number of tones constituting one resource unit (that is, the number of subcarriers and frequency units). Specifically, the time unit constituting one resource unit becomes longer as the number of tones (subcarriers) constituting one resource and / or the subcarrier interval decreases.
  • the time unit of one resource unit is 1 ms, respectively. 2 ms, 4 ms, and 8 ms.
  • the time unit of one resource unit is 32 ms.
  • one transport block (TB) which is a data storage unit may be mapped to one resource unit or may be mapped to a plurality of resource units. Further, the resource unit as described above can be applied not only to uplink transmission but also to downlink transmission.
  • a random access operation for the user terminal to perform initial connection, synchronization establishment, communication resumption, and the like is supported.
  • the user terminal specifies an operation for transmitting a physical random access channel (PRACH) and receiving a random access response (also referred to as an RA response, random access response, or RAR) for the PRACH.
  • PRACH physical random access channel
  • RAR random access response
  • Random access can be divided into two types: contention-based random access (CBRA) and non-collision random access (Non-CBRA). Note that the non-collision type RA may be called a contention-free RA (CFRA: Contention-Free Random Access).
  • CBRA contention-based random access
  • Non-CBRA non-collision random access
  • RA contention-free RA
  • a user terminal transmits a preamble selected randomly from a plurality of random access preambles (contention preambles) prepared in a cell by PRACH.
  • the user terminal transmits a UE-specific random access preamble (dedicated preamble) allocated from the network in advance using the PRACH.
  • the non-collision type random access since different random access preambles are allocated between user terminals, the occurrence of collision can be suppressed.
  • Collision-type random access is performed at the time of initial connection, uplink communication start, or restart.
  • Non-collision type random access is performed at the time of handover, downlink communication start or restart, and the like.
  • FIG. 3 shows an overview of random access. Collision type random access is composed of Step 1 to Step 4, and non-collision type random access is composed of Step 0 to Step 2.
  • the user terminal transmits a random access preamble (PRACH) using the PRACH resource set in the cell (message (Msg: Message) 1).
  • PRACH random access preamble
  • Msg message
  • RAR random access response
  • the user terminal attempts to receive the message 2 for a predetermined interval after transmitting the random access preamble. If reception of message 2 fails, message 1 is transmitted (retransmitted) again by increasing the transmission power of PRACH. Note that increasing the transmission power during signal retransmission is also referred to as power ramping.
  • the user terminal that has received the random access response transmits a data signal on the uplink shared channel (PUSCH) designated by the uplink grant included in the random access response (message 3).
  • the radio base station that has received the message 3 transmits a contention resolution message to the user terminal (message 4).
  • the user terminal secures synchronization by the messages 1 to 4 and identifies the radio base station, the user terminal completes the collision type random access process and establishes a connection.
  • the radio base station transmits a physical downlink control channel (PDCCH-order) that instructs the user terminal to transmit PRACH (message 0).
  • the user terminal transmits a random access preamble (PRACH) at a timing indicated by the PDCCH (message 1).
  • PRACH random access preamble
  • RAR random access response
  • the user terminal completes the non-collision type random access processing upon reception of the message 2. Note that, similarly to the collision type random access, when reception of the message 2 fails, the transmission power of the PRACH is increased and the message 1 is transmitted again.
  • transmission of a random access preamble (message 1) using PRACH is also referred to as PRACH transmission
  • reception of a random access response (message 2) using PRACH is also referred to as PRACH reception.
  • Random access preamble (message 1) takes into account that multiple user terminals select and transmit randomly (collision type), and that all NB-IoT terminals may not support multi-tone transmission Then, it is possible to transmit with a single tone (single subcarrier).
  • FIG. 4 shows an example when PRACH transmission is performed with a single tone.
  • the first UL transmission after PRACH transmission is message 3 in the random access operation.
  • the user terminal can support multi-tone transmission from the message 3 if possible.
  • the UL resource or the like transmitted by the user terminal with the message 3 can be designated by the radio base station with the random access response (message 2).
  • the radio base station sets (triggers) multitone transmission for a user terminal that supports multitone transmission, and controls the transmission method of message 3 in the user terminal.
  • the radio base station cannot determine whether or not the user terminal has UE capability (UE capability) for multi-tone transmission before RRC connection (before completion of the random access operation). Therefore, it is difficult to set (trigger) multitone transmission from the radio base station to the user terminal in a random access operation (for example, collision type).
  • the user terminal may control UL transmission after message 3 in accordance with the number of tones used for PRACH transmission (for example, with the same number of tones as PRACH transmission).
  • the question is how to apply multi-tone transmission for subsequent UL transmissions (eg, message 3).
  • the present inventors pay attention to the fact that the user terminal selects a predetermined transmission parameter when transmitting the message 1, and associates the transmission parameter used for transmitting the message 1 with the transmission method of the message 3 in the message 1 And the idea of controlling the transmission of message 3.
  • the transmission method of the message 3 can be the number of subcarriers (tones) and / or the subcarrier interval. Further, the number of subcarriers may be the number of subcarriers actually applied to transmission, or may be a single carrier (single tone) or a plurality of carriers (multitone).
  • a user terminal having a UE capability of multitone transmission can perform communication using multitone from an early stage of communication. Further, the radio base station can determine the transmission method of the message 3 based on the transmission parameter used by the user terminal for transmitting the message 1. Thereby, the radio base station can appropriately set the UL resource of message 3 in message 2.
  • the inventors of the present invention have conceived, as another aspect of the present invention, that the user terminal determines a transmission method of the message 3 and performs transmission regardless of transmission parameters used for transmission of the message 1. did.
  • the radio base station performs reception processing assuming a plurality of candidates (such as the number of tones) from the user terminal.
  • the present inventors also transmit the message 3 with a single tone, and after the RRC connection is established (after completion of the random access operation), the radio base station performs predetermined transmission according to the UE capability.
  • the idea was to set up multi-tone transmission for user terminals.
  • the use band of the NB-IoT terminal is limited to 180 kHz (1 PRB), which is a narrower band than the minimum system band (1.4 MHz) of the existing LTE system. I can't.
  • the band used by the NB-IoT terminal is narrower than the system band of the existing LTE system, such as 1.4 MHz equal to the minimum system band of the existing LTE system or a band narrower than 180 kHz. Any bandwidth can be used.
  • the subcarrier interval is 15 kHz and 180 kHz is composed of 12 subcarriers is illustrated, but the present invention is not limited thereto. This embodiment can be applied as appropriate, for example, when the subcarrier interval is 3.75 kHz and 180 kHz is configured with 48 subcarriers. As described with reference to FIG. 2, the time length of one resource unit may be changed according to the subcarrier interval.
  • the resource allocation unit is described as “subcarrier (tone)”.
  • the resource allocation unit in the present embodiment is not limited to this, and the frequency is lower than the resource allocation unit (PRB) in the existing LTE system. It may be a unit.
  • PRACH transmission parameters include PRACH preamble (number), PRACH resources (time, frequency and / or code resources), repetition number, CE level, and the like.
  • PRACH preamble number
  • PRACH resources time, frequency and / or code resources
  • repetition number repetition number
  • CE level repetition number
  • at least one of the PRACH preamble, the resource, the number of repetitions, and the CE level is associated with the message 3 transmission method.
  • the transmission method of the message 3 can be the number of subcarriers (tones) and / or the subcarrier interval. Further, the number of subcarriers may be the number of subcarriers actually applied to transmission, or may be a single carrier (single tone) or a plurality of carriers (multitone).
  • the subcarrier interval can be set to a predetermined value (for example, 15 kHz, 3.75 kHz).
  • the first transmission parameter of PRACH is associated with multi-tone transmission of message 3
  • the second transmission parameter of PRACH is associated with single-tone transmission of message 3 (see FIG. 5A).
  • the radio base station assumes that the message 3 is a multi-tone transmission and transmits the message 2 (resource allocation of the message 3) and the reception of the message 3. Control etc.
  • the transmission parameter of the received PRACH is the second transmission parameter
  • the radio base station assumes that the message 3 is single tone transmission and controls the transmission of the message 2 and the reception of the message 3.
  • the user terminal can select the message 1 transmission parameter in consideration of the message 3 transmission method (single tone or multitone).
  • the PRACH repetition number (or CE level) may be associated with the message 3 transmission method.
  • the case where the number of PRACH repetitions is equal to or smaller than a predetermined value is set as the first transmission parameter, and the case where it is equal to or larger than the predetermined value is set as the second transmission parameter.
  • the user terminal when performing single tone transmission with the message 3, the user terminal performs PRACH transmission with a repetition number equal to or greater than a predetermined value.
  • the user terminal when performing multitone transmission with message 3, the user terminal performs PRACH transmission with a repetition number less than a predetermined value.
  • a transmission parameter may be set by combining a plurality of transmission parameters (for example, resource and repetition number, PRACH preamble number and repetition number, etc.).
  • the first transmission parameter of PRACH is associated with the first transmission method of message 3 (for example, multitone transmission + subcarrier interval 15 kHz), and the second transmission parameter of PRACH and the second transmission method of message 3 (Single tone transmission + subcarrier interval 15 kHz) may be associated, and the third transmission parameter of PRACH may be associated with the third transmission method of message 3 (single tone transmission + subcarrier interval 3.75 kHz) (FIG. 5B).
  • the radio base station When the received transmission parameter of the PRACH is the first transmission parameter, the radio base station assumes that the message 3 is a multitone transmission with a subcarrier interval of 15 kHz, and controls the transmission of the message 2, the reception of the message 3, and the like. To do.
  • the transmission parameter of the received PRACH is the second transmission parameter, the radio base station assumes that the message 3 is single tone transmission with a subcarrier interval of 15 kHz, and transmits the message 2 and the reception of the message 3, etc. To control.
  • the received transmission parameter of the PRACH is the third transmission parameter, the radio base station assumes that the message 3 is a single tone transmission with a subcarrier interval of 3.75 kHz, and transmits the message 2 and the message 3 Control reception etc.
  • the user terminal may determine the subcarrier interval to be applied to UL transmission after message 3 based on broadcast information or the like. For example, when receiving broadcast information including the first information from the radio base station, the user terminal uses 15 kHz as the subcarrier interval, and when receiving broadcast information including the second information, the user terminal is 3 as the subcarrier interval. .75 kHz is used.
  • the first information can be information that notifies application of in-band operation (may include GB operation).
  • In-band operation refers to an operation mode within an existing LTE system band
  • GB operation refers to an operation mode at a frequency adjacent to an LTE system outside the existing LTE system band.
  • the CRS exists for the existing LTE system regardless of the position of the PRB, but in the GB operation, the CRS does not exist.
  • the second information may be information for notifying in-band operation non-application (or application of GB or stand-alone operation).
  • the user terminal can control the message 3 transmission method (or PRACH transmission parameter) based on the UE capability information, received power, coverage, and the like of the user terminal.
  • the operation method of the user terminal will be described below.
  • the user terminal When the user terminal supports only single tone transmission (non-multitone transmission is not supported), the user terminal performs PRACH transmission using a transmission parameter (for example, the second transmission parameter) associated with the single tone (see FIG. 6).
  • the user terminal acquires the PRACH configuration (PRACH resource) that can be used for PRACH transmission from system information (for example, SIB) transmitted before the random access operation. Then, the user terminal selects a PRACH resource corresponding to a predetermined transmission parameter (here, the second transmission parameter) from the received PRACH resources and performs PRACH transmission.
  • a transmission parameter for example, the second transmission parameter
  • the range (border) of each transmission parameter may be defined in advance in the specification.
  • the user terminal selects a condition corresponding to the second transmission parameter defined in advance from the PRACH resources received by the SIB.
  • the range of each transmission parameter may be notified from the radio base station to the user terminal by broadcast information (MIB, SIB, etc.).
  • the radio base station can notify the user terminal of an index that is a boundary (boundary) between the transmission parameters.
  • the radio base station sets the last index among indexes indicating the first transmission parameter (for example, repetition number, CE level, preamble number, etc.) in the broadcast information, or the index indicating the second transmission parameter.
  • the first (most youngest) index can be included in the broadcast information and transmitted.
  • the user terminal selects a condition corresponding to the second transmission parameter based on the PRACH resource received by the SIB and information on the transmission parameter range.
  • the radio base station that has received the PRACH transmitted with the second transmission parameter from the user terminal determines that the user terminal transmits the message 3 with a single tone, and then determines the message 2 (UL resource allocation for the message 3). Send. After receiving the message 2, the user terminal transmits the message 3 with a single tone.
  • the user terminal can perform PRACH transmission by applying a transmission parameter associated with each subcarrier interval (see FIG. 5B).
  • the user terminal selects a subcarrier interval to be applied in the message 3 based on information (for example, presence / absence of in-band operation) included in broadcast information (MIB, SIB, etc.) received before the random access operation. Can do.
  • the user terminal that supports only single-tone transmission transmits the PRACH with a predetermined transmission parameter, it is possible to appropriately transmit the message 2 and receive the message 3 on the radio base station side.
  • the user terminal can perform PRACH transmission using a transmission parameter (for example, the first transmission parameter) associated with the multitone (see FIG. 7).
  • the user terminal acquires the PRACH configuration (PRACH resource) that can be used for PRACH transmission from system information (for example, SIB) transmitted before the random access operation.
  • the user terminal selects a PRACH resource corresponding to a predetermined transmission parameter (here, the first transmission parameter) from the received PRACH resources, and performs PRACH transmission.
  • the range (border) of each transmission parameter may be defined in advance in the specification.
  • the user terminal selects a condition corresponding to the first transmission parameter defined in advance from the PRACH resources received by the SIB.
  • the range of each transmission parameter may be notified from the radio base station to the user terminal by broadcast information (MIB, SIB, etc.).
  • the radio base station can notify the user terminal of an index that is a boundary (boundary) between the transmission parameters.
  • the radio base station sets the last index among indexes indicating the first transmission parameter (for example, repetition number, CE level, preamble number, etc.) in the broadcast information, or the index indicating the second transmission parameter.
  • the first (most youngest) index can be included in the broadcast information and transmitted.
  • the user terminal selects a condition corresponding to the first transmission parameter based on the PRACH resource received by the SIB and information on the transmission parameter range.
  • the radio base station that has received the PRACH transmitted with the first transmission parameter from the user terminal determines that the user terminal transmits message 3 in multitone, and transmits message 2. After receiving the message 2, the user terminal transmits the message 3 in multitone.
  • a user terminal that supports single tone transmission and multitone transmission selects either the PRACH transmission parameter associated with the multitone or the transmission parameter associated with the single tone and controls the PRACH transmission. May be.
  • the user terminal controls PRACH transmission by selecting a predetermined transmission parameter in consideration of received power (for example, RSRP: Reference Signal Received Power) and / or coverage.
  • the user terminal controls the transmission method (single tone or multitone) of message 3 according to the transmission parameter selected at the time of PRACH transmission.
  • the user terminal that supports multitone transmission appropriately performs PRACH transmission by selecting the PRACH transmission parameter in consideration of the communication environment, and also performs single tone transmission with message 3 based on the PRACH transmission parameter.
  • multitone transmission can be performed.
  • the user terminal may determine a transmission method of the message 3 regardless of transmission parameters used for transmission of the PRACH.
  • the radio base station performs reception processing assuming a plurality of candidates (such as the number of tones) from the user terminal. That is, the radio base station performs the reception process assuming that the message 3 transmitted from the user terminal is a single tone and a multitone.
  • the radio base station may set the resource for single tone transmission (for example, PRB or tone position) of message 3 and the resource for multitone transmission separately.
  • Information about the resource can be notified to the user terminal by message 2.
  • the user terminal can control transmission of the message 3 using the resource set for single tone or the resource set for multitone.
  • the radio base station may notify the user terminal in advance of information on whether or not the radio base station supports multi-tone reception of the message 3 using broadcast information (for example, MIB or SIB). Good.
  • a user terminal having UE capability to perform multitone transmission selects a transmission method of message 3 based on broadcast information transmitted from the radio base station. For example, when wireless base station multitone transmission is supported, the user terminal transmits message 3 in multitone.
  • the user terminal may be configured to always transmit the message 3 with a single tone.
  • the UL signal (message 1 and message 3) in the random access operation is transmitted with a single tone, and the UL transmission method after establishing the RRC connection (after completion of the random access operation) is configured to be set by the radio base station. it can.
  • the user terminal when a user terminal performs a random access operation and establishes an RRC connection, the user terminal notifies the radio base station of UE capability information of the user terminal (for example, whether multi-tone transmission is supported).
  • the radio base station can set multitone transmission for each user terminal based on the UE capability information received from the user terminal. Thereby, after the radio base station grasps the capability information of each user terminal, it is possible to control communication by setting multitone transmission for each user terminal.
  • wireless communication system a configuration of a wireless communication system according to an embodiment of the present invention will be described.
  • the wireless communication method according to each aspect described above is applied.
  • wireless communication method which concerns on each aspect may be used independently, and may be combined.
  • an NB-IoT terminal is exemplified as a user terminal whose use band is limited to a narrow band, but the present invention is not limited to this.
  • FIG. 8 is a schematic configuration diagram of a radio communication system according to an embodiment of the present invention.
  • the wireless communication system 1 illustrated in FIG. 8 is an example in which an LTE system is employed in a network domain of a machine communication system.
  • carrier aggregation (CA) and / or dual connectivity (DC) in which a plurality of basic frequency blocks (component carriers) having the system bandwidth of the LTE system as one unit can be applied.
  • CA carrier aggregation
  • DC dual connectivity
  • the LTE system is set to a system band from a minimum of 1.4 MHz to a maximum of 20 MHz for both downlink and uplink, the present invention is not limited to this configuration.
  • the wireless communication system 1 includes SUPER 3G, LTE-A (LTE-Advanced), IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system), FRA (Future Radio Access), etc. May be called.
  • the wireless communication system 1 includes a wireless base station 10 and a plurality of user terminals 20A, 20B, and 20C that are wirelessly connected to the wireless base station 10.
  • the radio base station 10 is connected to the higher station apparatus 30 and is 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.
  • a plurality of user terminals 20 (20A-20C) can communicate with the radio base station 10 in the cell 50.
  • the user terminal 20A is a user terminal that supports LTE (up to Rel-10) or LTE-Advanced (including Rel-10 and later) (hereinafter, LTE terminal (LTE UE: LTE User Equipment)), and other terminals.
  • LTE terminal LTE UE: LTE User Equipment
  • the user terminals 20B and 20C are NB-IoT terminals (NB-IoT UE (NB-IoT User Equipment)) serving as communication devices in the machine communication system.
  • NB-IoT UE NB-IoT User Equipment
  • the user terminals 20 ⁇ / b> A, 20 ⁇ / b> B, and 20 ⁇ / b> C are simply referred to as the user terminal 20 when it is not necessary to distinguish between them.
  • the user terminal 20 may be called a UE (User Equipment) or the like.
  • the NB-IoT terminals 20B and 20C are user terminals whose use band is limited to a narrower band than the minimum system bandwidth supported by the existing LTE system.
  • the NB-IoT terminals 20B and 20C may be terminals compatible with various communication methods such as LTE and LTE-A, and are not limited to fixed communication terminals such as electric meters, gas meters, and vending machines, but also vehicles and the like.
  • the mobile communication terminal may be used.
  • the user terminal 20 may communicate directly with another user terminal 20 or may communicate via the radio base station 10.
  • orthogonal frequency division multiple access (OFDMA) is applied to the downlink, and single carrier-frequency division multiple access (SC-FDMA) is used for the uplink.
  • Carrier Frequency Division Multiple Access is applied.
  • 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 methods are not limited to these combinations.
  • downlink channels include a downlink shared channel (PDSCH) shared by each user terminal 20, a broadcast channel (PBCH: Physical Broadcast Channel), a downlink L1 / L2 control channel, and the like. Used. User data, higher layer control information, and predetermined SIB (System Information Block) are transmitted by PDSCH. Also, MIB (Master Information Block) is transmitted by PBCH.
  • PDSCH downlink shared channel
  • PBCH Physical Broadcast Channel
  • SIB System Information Block
  • Downlink L1 / L2 control channels include PDCCH (Physical Downlink Control Channel), EPDCCH (Enhanced Physical Downlink Control Channel), PCFICH (Physical Control Format Indicator Channel), PHICH (Physical Hybrid-ARQ Indicator Channel), and the like.
  • Downlink control information (DCI: Downlink Control Information) including scheduling information of PDSCH and PUSCH is transmitted by PDCCH.
  • the number of OFDM symbols used for PDCCH is transmitted by PCFICH.
  • the retransmission control information (HARQ-ACK) of PUSCH is transmitted by PHICH.
  • the EPDCCH is frequency-division multiplexed with the PDSCH, and is used for transmission of DCI and the like as with the PDCCH.
  • an uplink shared channel (PUSCH: Physical Uplink Shared Channel) shared by each user terminal 20, an uplink L1 / L2 control channel (PUCCH: Physical Uplink Control Channel), a random access channel (PRACH: Physical Random Access Channel) is used.
  • PUSCH may be referred to as an uplink data channel.
  • User data and higher layer control information are transmitted by PUSCH.
  • downlink radio quality information (CQI: Channel Quality Indicator), retransmission control information (HARQ-ACK), and the like are transmitted by PUCCH.
  • CQI Channel Quality Indicator
  • HARQ-ACK retransmission control information
  • a random access preamble for establishing connection with a cell is transmitted by the PRACH.
  • the channel for the MTC terminal / NB-IoT terminal may be represented with “M” indicating MTC or “NB” indicating NB-IoT, and may be represented by PDCCH / for MTC terminal / NB-IoT terminal.
  • EPDCCH, PDSCH, PUCCH, PUSCH may be referred to as M (NB) -PDCCH, M (NB) -PDSCH, M (NB) -PUCCH, M (NB) -PUSCH, etc., respectively.
  • PDCCH, PDSCH, PUCCH, and PUSCH are simply referred to as PDCCH, PDSCH, PUCCH, and PUSCH.
  • a cell-specific reference signal CRS
  • CSI-RS channel state information reference signal
  • DMRS demodulation reference signal
  • PRS Positioning Reference Signal
  • a measurement reference signal SRS: Sounding Reference Signal
  • a demodulation reference signal DMRS
  • the DMRS may be referred to as a user terminal specific reference signal (UE-specific Reference Signal). Further, the transmitted reference signal is not limited to these.
  • FIG. 9 is a diagram illustrating an example of the overall configuration of the radio base station according to the embodiment of the present invention.
  • the radio base station 10 includes at least 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.
  • User data transmitted from the radio base station 10 to the user terminal 20 via the downlink is input from the higher station apparatus 30 to the baseband signal processing unit 104 via the transmission path interface 106.
  • PDCP Packet Data Convergence Protocol
  • RLC Radio Link Control
  • MAC Medium Access
  • Retransmission control for example, HARQ (Hybrid Automatic Repeat reQuest) transmission processing
  • HARQ Hybrid Automatic Repeat reQuest
  • the downlink control signal is also subjected to transmission processing such as channel coding and inverse fast Fourier transform, and transferred to each transmitting / receiving unit 103.
  • Each transmission / reception unit 103 converts the baseband signal output by precoding from the baseband signal processing unit 104 for each antenna to a radio frequency band and transmits the converted signal.
  • 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 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 transmit and receive various signals with a narrow bandwidth (for example, 180 kHz) limited by the system bandwidth (for example, one component carrier).
  • the radio frequency signal received by each transmitting / receiving antenna 101 is amplified by the amplifier unit 102.
  • Each transmitting / receiving unit 103 receives the upstream signal amplified by the amplifier unit 102.
  • the transmission / reception unit 103 converts the frequency of the received signal into a baseband signal and outputs it to the baseband signal processing unit 104.
  • the baseband signal processing unit 104 performs fast Fourier transform (FFT) processing, inverse discrete Fourier transform (IDFT: Inverse Discrete Fourier Transform) processing, and error correction on user data included in the input upstream signal.
  • FFT fast Fourier transform
  • IDFT inverse discrete Fourier transform
  • Decoding, MAC retransmission control reception processing, RLC layer, and PDCP layer reception processing are performed and transferred to the upper station apparatus 30 via the transmission path interface 106.
  • the call processing unit 105 performs call processing such as communication channel setting and release, state management of the radio base station 10, and radio resource management.
  • the transmission path interface 106 transmits and receives signals to and from the higher station apparatus 30 via a predetermined interface.
  • the transmission path interface 106 transmits / receives signals (backhaul signaling) to / from other radio base stations 10 via an interface between base stations (for example, an optical fiber compliant with CPRI (Common Public Radio Interface), X2 interface). May be.
  • CPRI Common Public Radio Interface
  • X2 interface May be.
  • the transmission / reception unit (transmission unit) 103 transmits a synchronization signal, a reference signal, a control signal, a data signal, and the like to the user terminal 20 in a narrow band. Further, the transmission / reception unit (reception unit) 103 receives a reference signal, a control signal, a data signal, and the like from the user terminal 20 in a narrow band. Specifically, the transmission / reception unit (transmission unit) 103 transmits message 2 and message 4 in the random access operation. Further, the transmission / reception unit (reception unit) 103 receives the message 1 and the message 3 transmitted from the user terminal in the random access operation. Further, the transmission / reception unit (transmission unit) 103 can transmit broadcast information indicating whether or not an in-band operation is applied.
  • FIG. 10 is a diagram illustrating an example of a functional configuration of the radio base station according to the embodiment of the present invention. 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 (generation unit) 302, a mapping unit 303, a reception signal processing unit 304, and a measurement unit 305. I have.
  • 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 also controls system information, PDSCH, and PUSCH resource allocation (scheduling). It also controls resource allocation for downlink signals such as synchronization signals (for example, PSS (Primary Synchronization Signal) / SSS (Secondary Synchronization Signal), NB-SS) and CRS, CSI-RS, DM-RS.
  • control unit 301 controls the transmission signal generation unit 302 and the mapping unit 303 so that various signals are allocated to a narrow band and transmitted to the user terminal 20.
  • the control unit 301 controls, for example, downlink broadcast information (MIB, SIB (MTC-SIB)), PDCCH (also referred to as M-PDCCH, NB-PDCCH, etc.), PDSCH, and the like in a narrow band.
  • the narrow band (NB) is a band (for example, 180 kHz) narrower than the system band of the existing LTE system.
  • control unit 301 determines the number of subcarriers and / or the subcarrier interval used for transmission of the message 3 based on the transmission parameter used for transmission of the message 1 to transmit the message 2 or the message 3. Reception can be controlled.
  • control unit 301 receives the PUSCH with the determined PUSCH resource in cooperation with the transmission / reception unit 103, the reception signal processing unit 302, and the measurement unit 305. Further, the control unit 301 cooperates with the transmission signal generation unit 302, the mapping unit 303, and the transmission / reception unit 103 to transmit the PDSCH using the determined PDSCH resource.
  • the transmission signal generation unit (generation unit) 302 generates a downlink signal (PDCCH, PDSCH, downlink reference signal, etc.) based on an instruction from the control unit 301 and outputs it to the mapping unit 303.
  • the transmission signal generation unit 302 can be configured by a signal generator, a signal generation circuit, or a signal generation device described based on common recognition in the technical field according to the present invention.
  • the transmission signal generation unit 302 generates, for example, DCI (also referred to as DL assignment, UL grant, etc.) that allocates the PUSCH and / or PDSCH to the user terminal 20 based on an instruction from the control unit 301.
  • DCI also referred to as DL assignment, UL grant, etc.
  • the PDSCH is subjected to coding processing and modulation processing according to a coding rate, a modulation scheme, and the like determined based on channel state information (CSI) from each user terminal 20.
  • CSI channel state information
  • the mapping unit 303 Based on an instruction from the control unit 301, the mapping unit 303 maps the downlink signal generated by the transmission signal generation unit 302 to a predetermined narrowband radio resource (for example, a maximum of one resource block), and transmits and receives To 103.
  • the mapping unit 303 can be configured by a mapper, a mapping circuit, or a mapping device described based on common recognition in the technical field according to the present invention.
  • the reception signal processing unit 304 performs reception processing (for example, demapping, demodulation, decoding, etc.) on the reception signal input from the transmission / reception unit 103.
  • the received signal is, for example, an uplink signal (PUCCH, PUSCH, uplink reference signal, etc.) transmitted from the user terminal 20.
  • the reception signal processing unit 304 can be configured by a signal processor, a signal processing circuit, or a signal processing device described based on common recognition in the technical field according to the present invention.
  • the reception signal processing unit 304 outputs the information decoded by the reception processing to the control unit 301.
  • 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 signal reception power (for example, RSRP (Reference Signal Received Power)), reception quality (for example, RSRQ (Reference Signal Received Quality)), channel state, and the like.
  • the measurement result may be output to the control unit 301.
  • FIG. 11 is a diagram illustrating an example of an overall configuration of a user terminal according to an embodiment of the present invention. Although a detailed description is omitted here, a normal LTE terminal may behave as an NB-IoT terminal.
  • the user terminal 20 includes at least a transmission / reception antenna 201, an amplifier unit 202, a transmission / reception unit 203, a baseband signal processing unit 204, and an application unit 205.
  • the user terminal 20 may include a plurality of transmission / reception antennas 201, an amplifier unit 202, a transmission / reception unit 203, and the like.
  • the radio frequency signal received by the transmission / reception antenna 201 is amplified by the amplifier unit 202.
  • the transmission / reception unit 203 receives the downlink signal amplified by the amplifier unit 202.
  • the transmission / reception unit 203 converts the frequency of the received signal into a baseband signal and outputs it to the baseband signal processing unit 204.
  • the transmission / reception unit 203 can be configured by a transmitter / receiver, a transmission / reception circuit, or a transmission / reception device described based on common recognition in the technical field according to the present invention.
  • the transmission / reception unit 203 may be configured as an integral transmission / reception unit, or may be configured from a transmission unit and a reception unit.
  • the baseband signal processing unit 204 performs FFT processing, error correction decoding, retransmission control reception processing, and the like on the input baseband signal.
  • the downlink user data is transferred to the application unit 205.
  • the application unit 205 performs processing related to layers higher than the physical layer and the MAC layer.
  • broadcast information in the downlink data is also transferred to the application unit 205.
  • uplink user data is input from the application unit 205 to the baseband signal processing unit 204.
  • retransmission control information HARQ-ACK
  • channel coding channel coding
  • precoding precoding
  • 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 (reception unit) 203 receives a synchronization signal, a reference signal, a control signal, a data signal, and the like from the radio base station 10 in a narrow band. Further, the transmission / reception unit (transmission unit) 203 transmits a reference signal, a control signal, a data signal, and the like to the radio base station 10 in a narrow band. Specifically, the transmission / reception unit (transmission unit) 203 transmits the message 1 and the message 3 in the random access operation. The transmission / reception unit (reception unit) 203 receives the message 2 and the message 4 in the random access operation. Further, the transmission / reception unit (reception unit) 203 can receive broadcast information indicating whether or not to apply an inter-band operation.
  • FIG. 12 is a diagram illustrating an example of a functional configuration of the user terminal according to the embodiment of the present invention. 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 (generation unit) 402, a mapping unit 403, a reception signal processing unit 404, and a measurement unit. 405.
  • 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 downlink signal (PDCCH, PDSCH, downlink reference signal) transmitted from the radio base station 10 from the reception signal processing unit 404.
  • the control unit 401 controls generation of uplink control information (UCI) such as retransmission control information (HARQ-ACK) and channel state information (CSI) and uplink data based on the downlink signal.
  • UCI uplink control information
  • HARQ-ACK retransmission control information
  • CSI channel state information
  • control unit 401 associates the transmission parameters used for the transmission of the message 1 with the transmission method of the message 3 (for example, the number of subcarriers and / or the subcarrier interval) and transmits the message 1 and the message 3.
  • Control For example, the control unit 401 can determine the transmission parameter of the message 1 according to the number of subcarriers used for transmission of the message 3 and / or the subcarrier interval. Specifically, when the number of subcarriers used for transmission of message 3 is one, control unit 401 controls transmission of message 1 using the first transmission parameter and uses it for transmission of message 3. When there are a plurality of subcarriers to be transmitted, the transmission of message 1 is controlled using a second transmission parameter different from the first transmission parameter (see FIG. 5).
  • control unit 401 may determine the number of subcarriers and / or the subcarrier interval used for transmission of the message 3 according to the transmission parameter of the message 1. Specifically, when the message 401 is transmitted using the first transmission parameter, the control unit 401 controls the transmission of the message 3 using one subcarrier, and the first transmission parameter When message 1 is transmitted using different second transmission parameters, transmission of message 3 is controlled using a plurality of subcarriers.
  • the transmission parameter of message 1 associated with the number of subcarriers and / or the subcarrier interval used for transmission of message 3 is at least one of a random access preamble, a random access channel resource, a repetition number, and a cell extension level. (See FIG. 5).
  • control unit 401 can control the transmission of the message 1 using a single subcarrier.
  • control unit may determine the transmission method of message 3 without associating the transmission parameters of PRACH with the transmission method (number of subcarriers and / or subcarrier interval) of message 3 (the second mode described above). ).
  • control unit 401 cooperates with the transmission signal generation unit 402, the mapping unit 403, and the transmission / reception unit 203 to transmit PUSCH using the PUSCH resource.
  • control unit 401 receives the PDSCH using the PDSCH resource in cooperation with the transmission / reception unit 203, the reception signal processing unit 404, and the measurement unit 405.
  • the transmission signal generation unit 402 generates an uplink signal (PUCCH, PUSCH, uplink reference signal, etc.) based on an instruction from the control unit 401 and outputs the uplink signal to the mapping unit 403.
  • the transmission signal generation unit 402 can be configured by a signal generator, a signal generation circuit, or a signal generation device described based on common recognition in the technical field according to the present invention.
  • the transmission signal generation unit 402 generates uplink control information (UCI) and / or uplink data based on an instruction from the control unit 401, for example. Also, the transmission signal generation unit 402 generates a PUSCH that transmits UCI and / or uplink data based on an instruction from the control unit 401. For example, the transmission signal generation unit 402 is instructed by the control unit 401 to generate a PUSCH when DCI that assigns a PUSCH to the user terminal 20 is received. Further, the transmission signal generation unit 402 generates a PUCCH that transmits UCI based on an instruction from the control unit 401.
  • UCI uplink control information
  • PUSCH that transmits UCI and / or uplink data based on an instruction from the control unit 401. For example, the transmission signal generation unit 402 is instructed by the control unit 401 to generate a PUSCH when DCI that assigns a PUSCH to the user terminal 20 is received. Further, the transmission signal generation unit 402 generates a PUCCH that
  • the mapping unit 403 maps the uplink signal generated by the transmission signal generation unit 402 to a resource (for example, a PUSCH resource or a PUCCH resource) based on an instruction from the control unit 401, and outputs the resource to the transmission / reception unit 203.
  • the mapping unit 403 can be configured by a mapper, a mapping circuit, or a mapping device described based on common recognition in the technical field according to the present invention.
  • the reception signal processing unit 404 performs reception processing (for example, demapping, demodulation, decoding, etc.) on the reception signal input from the transmission / reception unit 203.
  • the received signal is, for example, a downlink signal (downlink control signal, downlink data signal, downlink reference signal, etc.) transmitted from the radio base station 10.
  • the reception signal processing unit 404 can be configured by a signal processor, a signal processing circuit, or a signal processing device described based on common recognition in the technical field according to the present invention.
  • the reception signal processing unit 404 outputs the information decoded by the reception processing to the control unit 401.
  • the reception signal processing unit 404 outputs broadcast information, system information, RRC signaling, DCI, and the like to the control unit 401, for example.
  • the reception signal processing unit 404 outputs the reception signal and the signal after reception processing to the measurement unit 405.
  • the measurement unit 405 performs measurement on the received signal.
  • the measurement part 405 can be comprised from the measuring device, measurement circuit, or measurement apparatus demonstrated based on common recognition in the technical field which concerns on this invention.
  • the measurement unit 405 may measure, for example, the received power (for example, RSRP), reception quality (for example, RSRQ), channel state, and the like of the received signal.
  • the measurement result may be output to the control unit 401.
  • each functional block is realized by one physically coupled device, or may be realized by two or more physically separated devices connected by wire or wirelessly and by a plurality of these devices. Good.
  • a wireless base station, a user terminal, etc. in an embodiment of the present invention may function as a computer that performs processing of the wireless communication method of the present invention.
  • FIG. 13 is a diagram illustrating an example of a hardware configuration of a radio base station and a user terminal according to an embodiment of the present invention.
  • the wireless base station 10 and the user terminal 20 described above may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like. Good.
  • the term “apparatus” can be read as a circuit, a device, a unit, or the like.
  • the hardware configurations of the radio base station 10 and the user terminal 20 may be configured to include one or a plurality of each device illustrated in the figure, or may be configured not to include some devices.
  • Each function in the radio base station 10 and the user terminal 20 is obtained by reading predetermined software (program) on hardware such as the processor 1001 and the memory 1002, so that the processor 1001 performs computation, and communication by the communication device 1004, This is realized by controlling reading and / or writing of data in the memory 1002 and the storage 1003.
  • the processor 1001 controls the entire computer by operating an operating system, for example.
  • the processor 1001 may be configured by a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, a register, and the like.
  • CPU central processing unit
  • the baseband signal processing unit 104 (204) and the call processing unit 105 described above may be realized by the processor 1001.
  • the processor 1001 reads programs (program codes), software modules, and data 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 from the storage 1003 and / or the communication device 1004 to the memory 1002, and executes various processes according to these.
  • the program a program that causes a computer to execute at least a part of the operations described in the above embodiments is used.
  • 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, and may be configured by at least one of ROM (Read Only Memory), EPROM (Erasable Programmable ROM), RAM (Random Access Memory), and the like, for example.
  • the memory 1002 may be called a register, a cache, a main memory (main storage device), or the like.
  • the memory 1002 can store a program (program code), a software module, and the like that can be executed to implement the wireless communication method according to the embodiment of the present invention.
  • the storage 1003 is a computer-readable recording medium, and may be composed of at least one of an optical disk such as a CD-ROM (Compact Disc ROM), a hard disk drive, a flexible disk, a magneto-optical disk, and a flash memory, for example. .
  • 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.
  • a network device for example, 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, etc.) that accepts external input.
  • the output device 1006 is an output device (for example, a display, a speaker, 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.
  • a component carrier CC may be called a cell, a frequency carrier, a carrier frequency, or the like.
  • 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.
  • a slot may be composed of one or more symbols (OFDM symbols, SC-FDMA symbols, etc.) in the time domain.
  • 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.
  • a TTI having a time length of 1 ms may be called a normal TTI (TTI in LTE Rel. 8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, or a long subframe.
  • TTI shorter than a normal TTI may be called a shortened TTI, a short TTI, a shortened subframe, a short subframe, or the like.
  • a resource block is a resource allocation unit in the time domain and the frequency domain, and may include one or a plurality of continuous subcarriers (subcarriers) in the frequency domain. Further, the RB may include one or a plurality of symbols in the time domain, and may have a length of one slot, one subframe, or 1 TTI. One TTI and one subframe may each be composed of one or a plurality of resource blocks.
  • the RB may be called a physical resource block (PRB: Physical RB), a PRB pair, an RB pair, or the like.
  • the resource block may be composed of one or a plurality of resource elements (RE: Resource Element).
  • RE Resource Element
  • 1RE may be a radio resource region of 1 subcarrier and 1 symbol.
  • the structure of the above-described radio frame, subframe, slot, symbol, and the like is merely an example.
  • the configuration such as the cyclic prefix (CP) length can be variously changed.
  • information, parameters, and the like described in this specification may be represented by absolute values, may be represented by relative values from a predetermined value, or may be represented by other corresponding information.
  • the radio resource may be indicated by a predetermined index.
  • software, instructions, information, etc. may be transmitted / received via a transmission medium.
  • software may use websites, servers, or other devices using wired technology (coaxial cable, fiber optic cable, twisted pair and digital subscriber line (DSL), etc.) and / or wireless technology (infrared, microwave, etc.) When transmitted from a remote source, these wired and / or wireless technologies are included within the definition of transmission media.
  • 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.
  • notification of predetermined information is not limited to explicitly performed, but is performed implicitly (for example, by not performing notification of the predetermined information). May be.
  • notification of information is not limited to the aspect / embodiment described in this specification, and may be performed by other methods.
  • notification of information includes physical layer signaling (eg, DCI (Downlink Control Information), UCI (Uplink Control Information)), upper layer signaling (eg, RRC (Radio Resource Control) signaling, broadcast information (MIB (Master Information Block)). ), SIB (System Information Block), etc.), MAC (Medium Access Control) signaling), other signals, or a combination thereof.
  • 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)).
  • MAC CE Control Element
  • LTE Long Term Evolution
  • LTE-A Long Term Evolution
  • LTE-B Long Term Evolution-Beyond
  • SUPER 3G IMT-Advanced
  • 4G 4th generation.
  • mobile communication system 5G (5th generation mobile communication system)
  • FRA Full Radio Access
  • New-RAT Radio Access Technology
  • CDMA2000 Code Division Multiple Access 2000
  • UMB User Mobile Broadband
  • IEEE 802.11 Wi-Fi (registered trademark)
  • IEEE 802.16 WiMAX (registered trademark)
  • IEEE 802.20 UWB (Ultra-WideBand
  • Bluetooth registered trademark

Landscapes

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

Abstract

L'invention vise à réaliser une communication de manière appropriée, même lorsqu'une attribution est commandée en des unités de fréquence (par exemple des unités de sous-porteuses) qui sont plus petites que des unités d'attribution de ressources dans les systèmes LTE existants. L'invention comprend : une unité d'émission qui émet un préambule d'accès aléatoire (message 1) et un message (3) dans une opération d'accès aléatoire ; et une unité de commande qui commande l'émission dudit message (1) et dudit message (3) en associant un paramètre d'émission utilisé pour l'émission dudit message (1) au nombre de sous-porteuses et/ou l'intervalle entre les sous-porteuses qui est/sont utilisé(es) pour l'émission dudit message (3).
PCT/JP2017/003704 2016-02-04 2017-02-02 Terminal d'utilisateur, station de base sans fil et procédé de communication sans fil WO2017135345A1 (fr)

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CN111247848B (zh) * 2017-09-15 2023-08-29 株式会社Ntt都科摩 终端、基站、系统以及无线通信方法
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