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WO2021161482A1 - Équipement utilisateur et procédé de communication - Google Patents

Équipement utilisateur et procédé de communication Download PDF

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Publication number
WO2021161482A1
WO2021161482A1 PCT/JP2020/005668 JP2020005668W WO2021161482A1 WO 2021161482 A1 WO2021161482 A1 WO 2021161482A1 JP 2020005668 W JP2020005668 W JP 2020005668W WO 2021161482 A1 WO2021161482 A1 WO 2021161482A1
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WO
WIPO (PCT)
Prior art keywords
resource
terminal
transmission
communication
harq
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
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PCT/JP2020/005668
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English (en)
Japanese (ja)
Inventor
翔平 吉岡
聡 永田
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NTT Docomo Inc
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NTT Docomo Inc
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Filing date
Publication date
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Priority to PCT/JP2020/005668 priority Critical patent/WO2021161482A1/fr
Publication of WO2021161482A1 publication Critical patent/WO2021161482A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/04—Error control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/02—Selection of wireless resources by user or terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/16—Interfaces between hierarchically similar devices
    • H04W92/18—Interfaces between hierarchically similar devices between terminal devices

Definitions

  • the present invention relates to a terminal and a communication method in a wireless communication system.
  • LTE Long Term Evolution
  • LTE-A Long Term Evolution Advanced
  • NR New Radio
  • 5G New Radio
  • Non-Patent Document 1 Non-Patent Document 1
  • D2D reduces the traffic between the terminal and the base station, and enables communication between the terminals even if the base station becomes unable to communicate in the event of a disaster or the like.
  • D2D is referred to as "sidelink", but in the present specification, D2D, which is a more general term, is used. However, in the description of the embodiment described later, a side link is also used if necessary.
  • D2D communication includes D2D discovery (also called D2D discovery) for discovering other terminals that can communicate, and D2D communication (D2D direct communication, D2D communication, direct communication between terminals) for direct communication between terminals. It is also roughly divided into communication, etc.).
  • D2D communication, D2D discovery, etc. are not particularly distinguished, they are simply referred to as D2D.
  • a signal transmitted / received in D2D is called a D2D signal.
  • Various use cases of services related to V2X (Vehicle to Everything) in NR are being studied (for example, Non-Patent Document 2).
  • resource allocation mode 2 Resource allocation mode 2
  • HARQ Hybrid automatic repeat request
  • the current resource selection method may not be able to appropriately secure resources for retransmission by HARQ in the side link.
  • the present invention has been made in view of the above points, and an object of the present invention is to secure resources for retransmission by HARQ (Hybrid automatic repeat request) in direct communication between terminals.
  • HARQ Hybrid automatic repeat request
  • a receiving unit that receives resource reservation information transmitted from another terminal in the sensing window, and a control unit that selects a resource to be used for transmission from the resource selection window based on the resource reservation information.
  • the control unit selects the first resource to be used for the first transmission from the first resource selection window, and the second resource for retransmission corresponding to the first transmission from the second resource selection window.
  • a terminal to select is provided.
  • HARQ Hybrid automatic repeat request
  • V2X It is a figure for demonstrating V2X. It is a figure for demonstrating the example (1) of the transmission mode of V2X. It is a figure for demonstrating the example (2) of the transmission mode of V2X. It is a figure for demonstrating the example (3) of the transmission mode of V2X. It is a figure for demonstrating the example (4) of the transmission mode of V2X. It is a figure for demonstrating the example (5) of the transmission mode of V2X. It is a figure for demonstrating the example (1) of the communication type of V2X. It is a figure for demonstrating the example (2) of the communication type of V2X. It is a figure for demonstrating the example (3) of the communication type of V2X. It is a sequence diagram which shows the operation example (1) of V2X.
  • LTE Long Term Evolution
  • NR Universal Terrestrial Radio Access
  • LAN Local Area Network
  • the duplex system may be a TDD (Time Division Duplex) system, an FDD (Frequency Division Duplex) system, or other system (for example, Flexible Duplex, etc.). Method may be used.
  • TDD Time Division Duplex
  • FDD Frequency Division Duplex
  • Method may be used.
  • "configuring" the radio parameter or the like may mean that a predetermined value is set in advance (Pre-configure), or the base station 10 or The radio parameter notified from the terminal 20 may be set.
  • FIG. 1 is a diagram for explaining V2X.
  • V2X Vehicle to Everything
  • eV2X enhanced V2X
  • FIG. 1 V2X is a part of ITS (Intelligent Transport Systems), V2V (Vehicle to Vehicle) which means a communication mode between vehicles, and a roadside installed between a vehicle and a roadside.
  • ITS Intelligent Transport Systems
  • V2V Vehicle to Vehicle
  • V2I Vehicle to Infrastructure
  • V2N Vehicle to Network
  • V2P Vehicle to Pedestrian
  • V2X using LTE or NR cellular communication and terminal-to-terminal communication is being studied.
  • V2X using cellular communication is also referred to as cellular V2X.
  • NR V2X studies are underway to realize large capacity, low delay, high reliability, and Quality of Service (QoS) control.
  • LTE or NR V2X it is expected that studies not limited to 3GPP specifications will be promoted in the future. For example, ensuring interoperability, reducing costs by implementing higher layers, using or switching between multiple RATs (RadioAccess Technology), compliance with regulations in each country, data acquisition, distribution, database management, and LTE or NR V2X platform data acquisition, distribution, and database management. It is expected that the usage method will be examined.
  • RATs RadioAccess Technology
  • the communication device is mounted on the vehicle, but the embodiment of the present invention is not limited to this mode.
  • the communication device may be a terminal held by a person, the communication device may be a device mounted on a drone or an aircraft, and the communication device may be a base station, an RSU, a relay station (relay node), or the like. It may be a terminal or the like having a scheduling ability.
  • SL may be distinguished based on any or combination of UL (Uplink) or DL (Downlink) and the following 1) -4). Further, SL may have another name. 1) Resource allocation in the time domain 2) Resource allocation in the frequency domain 3) Synchronization signal to be referenced (including SLSS (Sidelink Synchronization Signal)) 4) Reference signal used for path loss measurement for transmission power control
  • SL or UL OFDM Orthogonal Frequency Division Multiplexing
  • CP-OFDM Cyclic-Prefix OFDM
  • DFT-S-OFDM Discrete Fourier Transform-Spread-OFDM
  • Transform Precoded OFDM Transferformed Any of the above OFDM may be applied.
  • Mode 3 and Mode 4 are specified regarding the allocation of SL resources to the terminal 20.
  • transmission resources are dynamically allocated by DCI (Downlink Control Information) transmitted from the base station 10 to the terminal 20.
  • DCI Downlink Control Information
  • SPS SemiPersistent Scheduling
  • Mode 4 the terminal 20 autonomously selects a transmission resource from the resource pool.
  • the slot in the embodiment of the present invention may be read as a symbol, a mini slot, a subframe, a wireless frame, and a TTI (Transmission Time Interval).
  • the cell in the embodiment of the present invention may be read as a cell group, a carrier component, a BWP, a resource pool, a resource, a RAT (Radio Access Technology), a system (including a wireless LAN), or the like.
  • FIG. 2 is a diagram for explaining an example (1) of the transmission mode of V2X.
  • the base station 10 transmits the side link scheduling to the terminal 20A.
  • the terminal 20A transmits PSCCH (Physical Sidelink Control Channel) and PSCH (Physical Sidelink Shared Channel) to the terminal 20B based on the received scheduling (step 2).
  • the transmission mode of the side link communication shown in FIG. 2 may be referred to as the side link transmission mode 3 in LTE.
  • LTE sidelink transmission mode 3 Uu-based sidelink scheduling is performed.
  • Uu is a wireless interface between UTRAN (Universal Terrestrial Radio Access Network) and UE (User Equipment).
  • the transmission mode of the side link communication shown in FIG. 2 may be referred to as the side link transmission mode 1 in NR.
  • FIG. 3 is a diagram for explaining an example (2) of the transmission mode of V2X.
  • terminal 20A transmits PSCCH and PSCH to terminal 20B using autonomously selected resources.
  • the transmission mode of the side link communication shown in FIG. 3 may be referred to as the side link transmission mode 4 in LTE.
  • the UE In the side link transmission mode 4 in LTE, the UE itself executes resource selection.
  • FIG. 4 is a diagram for explaining an example (3) of the transmission mode of V2X.
  • terminal 20A transmits PSCCH and PSCH to terminal 20B using autonomously selected resources.
  • terminal 20B uses autonomously selected resources to transmit PSCCH and PSCH to terminal 20A (step 1).
  • the transmission mode of the side link communication shown in FIG. 4 may be referred to as the side link transmission mode 2a in NR.
  • the terminal 20 In the side link transmission mode 2 in NR, the terminal 20 itself executes resource selection.
  • FIG. 5 is a diagram for explaining an example (4) of the transmission mode of V2X.
  • the base station 10 transmits the side link grant to the terminal 20A via the RRC (Radio Resource Control) setting.
  • the terminal 20A transmits the PSCH to the terminal 20B based on the received resource pattern (step 1).
  • the transmission mode of the side link communication shown in FIG. 5 may be referred to as the side link transmission mode 2c in NR.
  • FIG. 6 is a diagram for explaining an example (5) of the transmission mode of V2X.
  • the terminal 20A transmits the side link scheduling to the terminal 20B via the PSCCH. Subsequently, the terminal 20B transmits the PSCH to the terminal 20A based on the received scheduling (step 2).
  • the transmission mode of the side link communication shown in FIG. 6 may be referred to as the side link transmission mode 2d in NR.
  • FIG. 7 is a diagram for explaining an example (1) of the communication type of V2X.
  • the sidelink communication type shown in FIG. 7 is unicast.
  • Terminal 20A transmits PSCCH and PSCH to terminal 20.
  • the terminal 20A unicasts to the terminal 20B and also unicasts to the terminal 20C.
  • FIG. 8 is a diagram for explaining an example (2) of the communication type of V2X.
  • the sidelink communication type shown in FIG. 8 is group cast.
  • Terminal 20A transmits PSCCH and PSCH to the group to which one or more terminals 20 belong.
  • the group includes a terminal 20B and a terminal 20C, and the terminal 20A performs a group cast to the group.
  • FIG. 9 is a diagram for explaining an example (3) of the communication type of V2X.
  • the sidelink communication type shown in FIG. 9 is broadcast.
  • Terminal 20A transmits PSCCH and PSCH to one or more terminals 20.
  • terminal 20A broadcasts to terminal 20B, terminal 20C and terminal 20D.
  • the terminal 20A shown in FIGS. 7 to 9 may be referred to as a header UE.
  • HARQ Hybrid automatic repeat request
  • SFCI Segmentlink Feedback Control Information
  • PSFCH Physical Sidelink Feedback Channel
  • PSFCH is used in the transmission of HARQ-ACK on the side link, but this is an example.
  • PSCCH may be used to transmit HARQ-ACK on the side link
  • PSCH may be used to transmit HARQ-ACK on the side link
  • other channels may be used. It may be used to transmit HARQ-ACK on the side link.
  • HARQ-ACK all the information reported by the terminal 20 in HARQ will be referred to as HARQ-ACK.
  • This HARQ-ACK may be referred to as HARQ-ACK information.
  • a codebook applied to the HARQ-ACK information reported from the terminal 20 to the base station 10 or the like is called a HARQ-ACK codebook.
  • the HARQ-ACK codebook defines a bit string of HARQ-ACK information.
  • NACK is also transmitted by "HARQ-ACK".
  • FIG. 10 is a diagram showing an example (1) of the configuration and operation of the wireless communication system according to the embodiment of the present invention.
  • the wireless communication system according to the embodiment of the present invention has a terminal 20A and a terminal 20B.
  • FIG. 10 shows terminals 20A and terminals 20B as examples.
  • terminal 20 terminal 20
  • terminal 20B terminal 20
  • user device terminal 20
  • FIG. 10 shows a case where both the terminal 20A and the terminal 20B are within the coverage of the cell as an example, the operation in the embodiment of the present invention can be applied even when the terminal 20B is outside the coverage.
  • the terminal 20 is a device mounted on a vehicle such as an automobile, and has a cellular communication function as a UE in LTE or NR and a side link function. There is.
  • the terminal 20 may be a general mobile terminal (smartphone or the like). Further, the terminal 20 may be an RSU.
  • the RSU may be a UE type RSU having a UE function or a gNB type RSU having a base station device function.
  • the terminal 20 does not have to be a device in one housing. For example, even when various sensors are distributed and arranged in the vehicle, the device including the various sensors is the terminal 20.
  • the processing content of the transmission data of the side link of the terminal 20 is basically the same as the processing content of UL transmission in LTE or NR.
  • the terminal 20 scrambles and modulates the code word of the transmission data to generate complex-valued symbols, maps the complex-valued symbols (transmission signal) to one or two layers, and performs precoding. Then, precoded complex-valued symbols are mapped to resource elements to generate a transmission signal (example: complex-valued time-domain SC-FDMA signal), which is transmitted from each antenna port.
  • the base station 10 has a cellular communication function as a base station in LTE or NR, and a function for enabling communication of the terminal 20 in the present embodiment (example: resource pool setting, resource allocation, etc.). have. Further, the base station 10 may be an RSU (gNB type RSU).
  • RSU gNB type RSU
  • the signal waveform used by the terminal 20 for SL or UL may be OFDMA, SC-FDMA, or other signal waveform. It may be.
  • step S101 the terminal 20A autonomously selects the resources to be used for PSCCH and PSCH from the resource selection window having a predetermined period.
  • the resource selection window may be set from the base station 10 to the terminal 20.
  • step S102 and step S103 the terminal 20A transmits SCI (Sidelink Control Information) by PSCCH and SL data by PSCH using the resource autonomously selected in step S101.
  • the terminal 20A may transmit the SCI (PSCCH) using the same time resource as the PSCH time resource and using the frequency resource adjacent to the PSCH frequency resource.
  • the terminal 20B receives the SCI (PSCCH) and SL data (PSSCH) transmitted from the terminal 20A.
  • the SCI received by the PSCCH may include information on the resources of the PSFCH for the terminal 20B to transmit the HARQ-ACK for receiving the data.
  • the terminal 20A may include the information of the resource selected autonomously in the SCI and transmit it.
  • step S104 the terminal 20B transmits HARQ-ACK for the received data to the terminal 20A by using the resource of the PSFCH specified by the received SCI.
  • step S105 the terminal 20A retransmits the PSCCH and PSCH to the terminal 20B when the HARQ-ACK received in step S104 indicates that the retransmission is requested, that is, when it is NACK (negative response).
  • Terminal 20A may resend PSCCH and PSCH using autonomously selected resources.
  • steps S104 and S105 may not be executed.
  • FIG. 11 is a diagram showing an example (2) of the configuration and operation of the wireless communication system according to the embodiment of the present invention. Blind retransmissions without HARQ control may be performed to improve transmission success rate or reach.
  • step S201 the terminal 20A autonomously selects the resources to be used for PSCCH and PSCH from the resource selection window having a predetermined period.
  • the resource selection window may be set from the base station 10 to the terminal 20.
  • the terminal 20A transmits SCI by PSCCH and SL data by PSCH using the resource autonomously selected in step S201.
  • the terminal 20A may transmit the SCI (PSCCH) using the same time resource as the PSCH time resource and using the frequency resource adjacent to the PSCH frequency resource.
  • step S204 the terminal 20A retransmits the SCI by PSCCH and the SL data by PSCH to the terminal 20B by using the resource autonomously selected in step S201.
  • the retransmission in step S204 may be executed a plurality of times.
  • step S204 may not be executed.
  • FIG. 12 is a diagram showing an example (3) of the configuration and operation of the wireless communication system according to the embodiment of the present invention.
  • the base station 10 may perform side link scheduling. That is, the base station 10 may determine the resource of the side link used by the terminal 20 and transmit the information indicating the resource to the terminal 20. Further, when HARQ control is applied, the base station 10 may transmit information indicating PSFCH resources to the terminal 20.
  • step S301 the base station 10 performs SL scheduling by sending DCI (Downlink Control Information) to the terminal 20A by PDCCH.
  • DCI Downlink Control Information
  • the DCI for SL scheduling will be referred to as SL scheduling DCI.
  • step S301 it is assumed that the base station 10 also transmits DCI for DL scheduling (which may be called DL allocation) to the terminal 20A by PDCCH.
  • DCI for DL scheduling (which may be called DL allocation)
  • the DCI for DL scheduling will be referred to as DL scheduling DCI.
  • the terminal 20A that has received the DL scheduling DCI receives the DL data by PDSCH using the resource specified by the DL scheduling DCI.
  • step S302 and step S303 the terminal 20A transmits SCI (Sidelink Control Information) by PSCCH and SL data by PSCH using the resource specified by SL scheduling DCI.
  • SCI Servicelink Control Information
  • SL scheduling DCI only PSCH resources may be specified.
  • the terminal 20A may transmit the SCI (PSCCH) with the same time resource as the PSCH time resource and using the frequency resource adjacent to the PSCH frequency resource.
  • the terminal 20B receives the SCI (PSCCH) and SL data (PSSCH) transmitted from the terminal 20A.
  • the SCI received by the PSCCH includes information on the PSFCH resource for the terminal 20B to transmit the HARQ-ACK for receiving the data.
  • the resource information is included in the DL scheduling DCI or SL scheduling DCI transmitted from the base station 10 in step S301, and the terminal 20A acquires the resource information from the DL scheduling DCI or SL scheduling DCI and SCI. Include in. Alternatively, the DCI transmitted from the base station 10 may not include the information of the resource, and the terminal 20A may autonomously include the information of the resource in the SCI and transmit the information.
  • step S304 the terminal 20B transmits HARQ-ACK for the received data to the terminal 20A using the resource of the PSFCH specified by the received SCI.
  • the terminal 20A has a PUCCH (or the SL scheduling DCI) designated by the DL scheduling DCI (or the SL scheduling DCI) at the timing specified by the DL scheduling DCI (or SL scheduling DCI) (for example, slot unit timing).
  • the HARQ-ACK is transmitted using the resource, and the base station 10 receives the HARQ-ACK.
  • the HARQ-ACK codebook may include HARQ-ACK received from the terminal 20B and HARQ-ACK for DL data. However, HARQ-ACK for DL data is not included when DL data is not assigned.
  • steps S304 and S305 may not be executed.
  • FIG. 13 is a diagram showing an operation example (4) in the embodiment of the present invention.
  • PSFCH Physical Uplink Control Channel
  • the PSFCH format the same format as PUCCH (Physical Uplink Control Channel) format 0 can be used. That is, the PSFCH format may have a PRB (Physical Resource Block) size of 1, and ACK and NACK may be sequence-based formats identified by sequence differences.
  • the format of PSFCH is not limited to this.
  • the resources of PSFCH may be arranged in the symbol at the end of the slot or the plurality of symbols at the end. Further, whether or not the period N is set in the PSFCH resource is specified in advance. The period N may be set or predetermined in slot units.
  • the vertical axis corresponds to the frequency domain and the horizontal axis corresponds to the time domain.
  • the PSCCH may be arranged in one symbol at the beginning of the slot, may be arranged in a plurality of symbols from the beginning, or may be arranged in a plurality of symbols from a symbol other than the beginning.
  • the PSFCH may be arranged in one symbol at the end of the slot, or may be arranged in a plurality of symbols at the end of the slot.
  • three subchannels are set in the resource pool, and two PSFCHs are arranged three slots after the slot in which the PSSCH is arranged.
  • the arrow from PSSCH to PSFCH shows an example of PSFCH associated with PSSCH.
  • step S401 the terminal 20A, which is the transmitting side terminal 20, executes a group cast to the terminal 20B, the terminal 20C, and the terminal 20D, which are the receiving side terminals 20, via SL-SCH.
  • terminal 20B uses PSFCH # B
  • terminal 20C uses PSFCH # C
  • terminal 20D uses PSFCH # D to transmit a HARQ response to terminal 20A.
  • the number of available PSFCH resources is less than the number of receiving terminals 20 belonging to the group, it is necessary to determine how to allocate the PSFCH resources. ..
  • the transmitting side terminal 20 may know the number of receiving side terminals 20 in the group cast.
  • FIG. 14 is a diagram showing an example of a transmission operation.
  • the terminal 20 selects a resource and transmits the resource.
  • the terminal 20 performs sensing in the sensing window.
  • Resource reservation information (resource reservation information) is received by sensing, and available resource candidates in the resource selection window (resource selection window) are determined based on the resource reservation information. Then, a resource is randomly selected from the available resource candidates.
  • the present invention is not limited to the resource allocation mode 2, as long as the terminal selects a resource. For example, it may be a case where the terminal autonomously selects a resource, or a case where the terminal selects a resource without receiving an instruction from a base station.
  • the transmission trigger at the terminal 20 occurs at time n, and the priority of the transmission is pj .
  • Terminal 20 in the sensing window from time n-T 0 to n-T proc, 0, for example, another terminal 20 can be determined to have transmitted the priority p i.
  • resources occupied by other UEs are identified, and resources excluding the resources are available resource candidates.
  • T 0 may be set (in advance) as, for example, 1100 ms or 100 ms
  • T proc, 0 is defined as the time required to receive and decode resource reservation information transmitted from, for example, another terminal. May be good.
  • the resource for HARQ retransmission may mean a resource used for retransmission performed based on HARQ feedback.
  • FIG. 15 is a flowchart for explaining an example (1) of resource selection in the embodiment of the present invention.
  • the terminal 20 performs sensing. Subsequently, the terminal 20 identifies the resource in the resource selection window based on the sensing result (S12). Subsequently, the terminal 20 selects a resource from the resource selection window (S13). In step S13, resources may be randomly selected.
  • step S14 the terminal 20 determines whether or not the resource for HARQ retransmission corresponding to the selected resource is sufficient in the resource selection window.
  • the resource for HARQ retransmission is sufficient (YES in S14)
  • the flow is terminated and the transmission operation is started with the selected resource.
  • the process proceeds to step S15.
  • step S15 the terminal 20 excludes the selected resource from the resource candidates, proceeds to step S13, and selects the resource again from the resource selection window.
  • Insufficient resources for HARQ retransmission may mean that the terminal 20 has not reached the number of resources reserved by the transmission, and the number of resources may include the transmission. .. For example, in the case of selecting three resources including the transmission, if the three resources are not selected, the process may proceed to step S15.
  • resource candidates may be separated for blind retransmission and retransmission by HARQ. Further, for example, resource candidates may be classified into a plurality of groups.
  • FIG. 16 is a diagram showing an example of a transmission operation according to the embodiment of the present invention.
  • the resource selection window for selecting resources for initial transmission and retransmission by HARQ is defined, set, or determined as a specific period. May be good.
  • the transmission trigger occurs at time n.
  • the first resource may be selected.
  • at least one of T 1 and T 2 is, it may be a separate parameter and T 1 and T 2 in FIG. 14, or may be different values.
  • the terminal 20 may execute one or more of the operations shown in 1) -10) below as the operation related to the retransmission by HARQ.
  • the operations of 4) -10) may be repeated, or some of them may be omitted.
  • the terminal 20 may use a plurality of resource selection windows to select a plurality of resources for retransmission by HARQ.
  • the resource selection window for resource selection for initial transmission and retransmission by HARQ may be shorter than the resource selection window for resource selection for initial transmission and blind retransmission.
  • the period of the resource selection window may be determined based on the parameters X and Y.
  • the parameter X and the parameter Y may be a parameter of the RRC layer, a parameter of the MAC layer, or a parameter of the PHY layer.
  • T 3 may be determined based on X.
  • T 3 may be X + ⁇ .
  • ⁇ may be a value based on the resource of PSFCH corresponding to the resource of the first delivery.
  • ⁇ may be the time between PSCCH / PSCH and PSFCH + the time of PSFCH + the time after PSFCH (eg, processing time).
  • ⁇ corresponds to the interval at which the resource selection window and the resource selection window for the next retransmission are arranged.
  • T 5 may be determined based on Y.
  • T 5 may be Y + ⁇ .
  • ⁇ may be a value based on the resource of PSFCH corresponding to the resource of retransmission # 1.
  • ⁇ may be the time between PSCCH / PSCH and PSFCH + the time of PSFCH + the time after PSFCH (eg, processing time).
  • ⁇ corresponds to the interval at which the resource selection window and the resource selection window for the next retransmission are arranged.
  • X may be determined based on at least one of N and PDB.
  • PDB Packet delay budget
  • N may be the number of resources used and reserved in one transmission. That is, N may be the total number of initial transmissions and retransmissions.
  • the PDB is the maximum value of the packet transmission delay.
  • FIG. 17 is a flowchart for explaining an example (2) of resource selection in the embodiment of the present invention. The operation of selecting a resource for retransmission by HARQ when one resource is selected from one resource selection window will be described with reference to FIG.
  • step S21 the terminal 20 performs sensing. Subsequently, the terminal 20 identifies the resource in the resource selection window based on the sensing result (S22). Subsequently, the terminal 20 selects a resource from the resource selection window (S23). In step S23, a resource may be selected from each of a plurality of resource selection windows corresponding to the initial transmission and the subsequent retransmission. Further, in step S23, resources may be randomly selected.
  • step S24 the terminal 20 determines whether or not the resource for HARQ retransmission corresponding to the selected resource is sufficient in the resource selection window. There may be a plurality of resources for HARQ retransmission. When the resource for HARQ retransmission is sufficient (YES in S24), the flow is terminated and the transmission operation is started with the selected resource. On the other hand, if the resources for HARQ retransmission are not sufficient (NO in S24), the process proceeds to step S21. In step S21, the terminal 20 executes sensing again.
  • the terminal 20 can execute the resource selection in consideration of the resource for retransmission by HARQ in the side link.
  • HARQ Hybrid automatic repeat request
  • the base station 10 and the terminal 20 include a function of carrying out the above-described embodiment.
  • the base station 10 and the terminal 20 may each have only a part of the functions in the embodiment.
  • FIG. 18 is a diagram showing an example of the functional configuration of the base station 10.
  • the base station 10 includes a transmission unit 110, a reception unit 120, a setting unit 130, and a control unit 140.
  • the functional configuration shown in FIG. 18 is only an example. Any function classification and name of the functional unit may be used as long as the operation according to the embodiment of the present invention can be executed.
  • the transmission unit 110 includes a function of generating a signal to be transmitted to the terminal 20 side and transmitting the signal wirelessly.
  • the receiving unit 120 includes a function of receiving various signals transmitted from the terminal 20 and acquiring information of, for example, a higher layer from the received signals. Further, the transmission unit 110 has a function of transmitting NR-PSS, NR-SSS, NR-PBCH, DL / UL control signal, DL reference signal and the like to the terminal 20.
  • the setting unit 130 stores preset setting information and various setting information to be transmitted to the terminal 20 in the storage device, and reads the setting information from the storage device as needed.
  • the content of the setting information is, for example, information related to the setting of D2D communication.
  • the control unit 140 performs processing related to the setting for the terminal 20 to perform D2D communication. Further, the control unit 140 transmits the scheduling of the D2D communication and the DL communication to the terminal 20 via the transmission unit 110. Further, the control unit 140 receives information related to the HARQ response of the D2D communication and the DL communication from the terminal 20 via the reception unit 120.
  • the function unit related to signal transmission in the control unit 140 may be included in the transmission unit 110, and the function unit related to signal reception in the control unit 140 may be included in the reception unit 120.
  • FIG. 19 is a diagram showing an example of the functional configuration of the terminal 20.
  • the terminal 20 has a transmitting unit 210, a receiving unit 220, a setting unit 230, and a control unit 240.
  • the functional configuration shown in FIG. 19 is only an example. Any function classification and name of the functional unit may be used as long as the operation according to the embodiment of the present invention can be executed.
  • the transmission unit 210 creates a transmission signal from the transmission data and wirelessly transmits the transmission signal.
  • the receiving unit 220 wirelessly receives various signals and acquires a signal of a higher layer from the received signal of the physical layer. Further, the receiving unit 220 has a function of receiving NR-PSS, NR-SSS, NR-PBCH, DL / UL / SL control signal, reference signal and the like transmitted from the base station 10. Further, for example, the transmission unit 210 connects the other terminal 20 to PSCCH (Physical Sidelink Control Channel), PSCH (Physical Sidelink Shared Channel), PSDCH (Physical Sidelink Discovery Channel), PSBCH (Physical Sidelink Broadcast Channel) as D2D communication. Etc., and the receiving unit 220 receives the PSCCH, PSCH, PSDCH, PSBCH, etc. from the other terminal 20.
  • PSCCH Physical Sidelink Control Channel
  • PSCH Physical Sidelink Shared Channel
  • PSDCH Physical Sidelink Discovery Channel
  • PSBCH Physical Side
  • the setting unit 230 stores various setting information received from the base station 10 or the terminal 20 by the receiving unit 220 in the storage device, and reads it out from the storage device as needed.
  • the setting unit 230 also stores preset setting information.
  • the content of the setting information is, for example, information related to the setting of D2D communication.
  • the control unit 240 controls D2D communication with another terminal 20 as described in the embodiment.
  • the control unit 240 performs processing related to HARQ of D2D communication and DL communication.
  • the control unit 240 transmits information related to the HARQ response of the D2D communication and the DL communication from the base station 10 to the other terminal 20 scheduled to the base station 10.
  • the control unit 240 may schedule D2D communication to another terminal 20.
  • the control unit 240 may autonomously select a resource to be used for D2D communication from the resource selection window.
  • the control unit 240 performs processing related to MCS in transmission / reception of D2D communication.
  • the function unit related to signal transmission in the control unit 240 may be included in the transmission unit 210, and the function unit related to signal reception in the control unit 240 may be included in the reception unit 220.
  • each functional block may be realized by using one device that is physically or logically connected, or directly or indirectly (for example, by two or more devices that are physically or logically separated). , Wired, wireless, etc.) and may be realized using these plurality of devices.
  • the functional block may be realized by combining the software with the one device or the plurality of devices.
  • Functions include judgment, decision, judgment, calculation, calculation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, solution, selection, selection, establishment, comparison, assumption, expectation, and assumption.
  • broadcasting notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc., but only these.
  • a functional block that makes transmission function is called a transmitting unit (transmitting unit) or a transmitter (transmitter).
  • transmitting unit transmitting unit
  • transmitter transmitter
  • the base station 10, the terminal 20, and the like in one embodiment of the present disclosure may function as a computer that processes the wireless communication method of the present disclosure.
  • FIG. 20 is a diagram showing an example of the hardware configuration of the base station 10 and the terminal 20 according to the embodiment of the present disclosure.
  • the above-mentioned base station 10 and terminal 20 are physically configured as a computer device including a processor 1001, a storage device 1002, an auxiliary storage device 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like. May be good.
  • the word “device” can be read as a circuit, device, unit, etc.
  • the hardware configuration of the base station 10 and the terminal 20 may be configured to include one or more of the devices shown in the figure, or may be configured not to include some of the devices.
  • the processor 1001 For each function of the base station 10 and the terminal 20, the processor 1001 performs an operation by loading predetermined software (program) on the hardware such as the processor 1001 and the storage device 1002, and controls the communication by the communication device 1004. It is realized by controlling at least one of reading and writing of data in the storage device 1002 and the auxiliary storage device 1003.
  • Processor 1001 operates, for example, an operating system to control the entire computer.
  • the processor 1001 may be composed of a central processing unit (CPU: Central Processing Unit) including an interface with a peripheral device, a control device, an arithmetic unit, a register, and the like.
  • CPU Central Processing Unit
  • control unit 140, control unit 240, and the like may be realized by the processor 1001.
  • the processor 1001 reads a program (program code), a software module, data, or the like from at least one of the auxiliary storage device 1003 and the communication device 1004 into the storage device 1002, and executes various processes according to these.
  • a program program that causes a computer to execute at least a part of the operations described in the above-described embodiment is used.
  • the control unit 140 of the base station 10 shown in FIG. 18 may be realized by a control program stored in the storage device 1002 and operated by the processor 1001.
  • the control unit 240 of the terminal 20 shown in FIG. 19 may be realized by a control program stored in the storage device 1002 and operated by the processor 1001.
  • Processor 1001 may be implemented by one or more chips.
  • the program may be transmitted from the network via a telecommunication line.
  • the storage device 1002 is a computer-readable recording medium, for example, by at least one of ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electrically Erasable Programmable ROM), RAM (Random Access Memory), and the like. It may be configured.
  • the storage device 1002 may be referred to as a register, a cache, a main memory (main storage device), or the like.
  • the storage device 1002 can store a program (program code), a software module, or the like that can be executed to implement the communication method according to the embodiment of the present disclosure.
  • the auxiliary storage device 1003 is a computer-readable recording medium, and is, for example, an optical disk such as a CD-ROM (Compact Disc ROM), a hard disk drive, a flexible disk, an optical magnetic disk (for example, a compact disk, a digital versatile disk, Blu).
  • -It may be composed of at least one of a ray (registered trademark) disk), a smart card, a flash memory (for example, a card, a stick, a key drive), a floppy (registered trademark) disk, a magnetic strip, and the like.
  • the storage medium described above may be, for example, a database, server or other suitable medium containing at least one of the storage device 1002 and the auxiliary storage device 1003.
  • the communication device 1004 is hardware (transmission / reception device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, 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 in order to realize at least one of frequency division duplex (FDD: Frequency Division Duplex) and time division duplex (TDD: Time Division Duplex). It may be composed of.
  • FDD Frequency Division Duplex
  • TDD Time Division Duplex
  • the transmission / reception unit may be physically or logically separated from each other in the transmission unit and the reception unit.
  • the input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that receives an input from the outside.
  • the output device 1006 is an output device (for example, a display, a speaker, an LED lamp, etc.) that outputs 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 storage device 1002 is connected by a bus 1007 for communicating information.
  • the bus 1007 may be configured by using a single bus, or may be configured by using a different bus for each device.
  • the base station 10 and the terminal 20 are hardware such as a microprocessor, a digital signal processor (DSP: Digital Signal Processor), an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), and an FPGA (Field Programmable Gate Array). It may be configured to include, and a part or all of each functional block may be realized by the hardware. For example, processor 1001 may be implemented using 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 receiving unit that receives the resource reservation information transmitted from another terminal in the sensing window and the resource used for transmission based on the resource reservation information.
  • Has a control unit that selects A terminal is provided that selects a second resource for the corresponding retransmission.
  • the terminal 20 can execute resource selection in consideration of resources for retransmission by HARQ in the side link. That is, it is possible to secure a resource for retransmission by HARQ (Hybrid automatic repeat request) in direct communication between terminals.
  • HARQ Hybrid automatic repeat request
  • the control unit may select a plurality of resources for multiple retransmissions corresponding to the initial transmission, one from each of the plurality of resource selection windows.
  • the terminal 20 can execute resource selection in consideration of resources for retransmission by HARQ in the side link.
  • the interval at which the plurality of resource selection windows are arranged may be set based on the time related to HARQ feedback. With this configuration, the terminal 20 can execute resource selection in consideration of resources for retransmission by HARQ in the side link.
  • the first parameter for determining the start time of the plurality of resource selection windows and the second parameter for determining the end time of the plurality of resource selection windows may be calculated based on PDB (Packet delay budget).
  • PDB Packet delay budget
  • the first parameter and the second parameter may be calculated based on the total number of transmissions of the initial transmission and the plurality of retransmissions.
  • the terminal 20 can execute the selection of the resource for retransmission by HARQ in the side link in consideration of the packet delay time.
  • the receiving procedure for receiving the resource reservation information transmitted from another terminal in the sensing window and the resource to be used for transmission based on the resource reservation information are selected from the resource selection window.
  • the terminal executes the selected control procedure, and the control procedure selects the first resource to be used for the first transmission from the first resource selection window, and retransmits the first resource from the second resource selection window.
  • a communication method is provided that includes a procedure for selecting a second resource for.
  • the terminal 20 can execute resource selection in consideration of resources for retransmission by HARQ in the side link. That is, it is possible to secure a resource for retransmission by HARQ (Hybrid automatic repeat request) in direct communication between terminals.
  • HARQ Hybrid automatic repeat request
  • the boundary of the functional unit or the processing unit in the functional block diagram does not always correspond to the boundary of the physical component.
  • the operation of the plurality of functional units may be physically performed by one component, or the operation of one functional unit may be physically performed by a plurality of components.
  • the processing order may be changed as long as there is no contradiction.
  • the base station 10 and the terminal 20 have been described with reference to functional block diagrams, but such devices may be implemented in hardware, software, or a combination thereof.
  • the software operated by the processor of the base station 10 according to the embodiment of the present invention and the software operated by the processor of the terminal 20 according to the embodiment of the present invention are random access memory (RAM), flash memory, and read-only memory, respectively. It may be stored in (ROM), EPROM, EEPROM, registers, hard disk (HDD), removable disk, CD-ROM, database, server or any other suitable storage medium.
  • information notification includes physical layer signaling (for example, DCI (Downlink Control Information), UCI (Uplink Control Information)), higher layer signaling (for example, RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling, etc. Broadcast information (MIB (Master Information Block), SIB (System Information Block)), other signals, or a combination thereof may be used.
  • RRC signaling may be referred to as an RRC message, for example, RRC. It may be a connection setup (RRCConnectionSetup) message, an RRC connection reconfiguration (RRCConnectionReconfiguration) message, or the like.
  • Each aspect / embodiment described in the present disclosure includes LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), and 5G (5th generation mobile communication).
  • system FRA (Future Radio Access), NR (new Radio), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark)) )), LTE 802.16 (WiMAX®), IEEE 802.20, UWB (Ultra-WideBand), Bluetooth®, and other systems that utilize suitable systems and have been extended based on these. It may be applied to at least one of the next generation systems. Further, a plurality of systems may be applied in combination (for example, a combination of at least one of LTE and LTE-A and 5G).
  • the specific operation performed by the base station 10 in the present specification may be performed by its upper node.
  • various operations performed for communication with the terminal 20 are performed by the base station 10 and other network nodes other than the base station 10 (for example, it is clear that it can be done by at least one of (but not limited to, MME, S-GW, etc.).
  • the other network node may be a combination of a plurality of other network nodes (for example, MME and S-GW). ..
  • the information, signals, etc. described in the present disclosure can be output from the upper layer (or lower layer) to the lower layer (or upper layer). Input / output may be performed via a plurality of network nodes.
  • the input / output information and the like may be stored in a specific location (for example, memory) or may be managed using a management table. Input / output information and the like can be overwritten, updated, or added. The output information and the like may be deleted. The input information or the like may be transmitted to another device.
  • the determination in the present disclosure may be made by a value represented by 1 bit (0 or 1), by a truth value (Boolean: true or false), or by comparing numerical values (for example,). , Comparison with a predetermined value).
  • Software whether referred to as software, firmware, middleware, microcode, hardware description language, or by any other name, is an instruction, instruction set, code, code segment, program code, program, subprogram, software module.
  • Applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, features, etc. should be broadly interpreted.
  • software, instructions, information, etc. may be transmitted and received via a transmission medium.
  • a transmission medium For example, a website where the software uses at least one of wired technology (coaxial cable, fiber optic cable, twist pair, digital subscriber line (DSL: Digital Subscriber Line), etc.) and wireless technology (infrared, microwave, etc.).
  • wired technology coaxial cable, fiber optic cable, twist pair, digital subscriber line (DSL: Digital Subscriber Line), etc.
  • wireless technology infrared, microwave, etc.
  • the information, signals, etc. described in this disclosure may be represented using any of a variety of different techniques.
  • data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description are voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any of these. It may be represented by a combination of.
  • a channel and a symbol may be a signal (signaling).
  • the signal may be a message.
  • the component carrier CC: Component Carrier
  • CC Component Carrier
  • system and “network” used in this disclosure are used interchangeably.
  • the information, parameters, etc. described in the present disclosure may be expressed using absolute values, relative values from predetermined values, or using other corresponding information. It may be represented.
  • the radio resource may be one indicated by an index.
  • base station Base Station
  • wireless base station base station
  • base station fixed station
  • NodeB nodeB
  • eNodeB eNodeB
  • gNodeB gNodeB
  • access point “ transmission point ”,“ reception point ”,“ transmission / reception point ”,“ cell ”,“ sector ”,“ Terms such as “cell group”, “carrier”, and “component carrier” can be used interchangeably.
  • Base stations are sometimes referred to by terms such as macrocells, small cells, femtocells, and picocells.
  • the base station can accommodate one or more (for example, three) cells.
  • a base station accommodates multiple cells, the entire coverage area of the base station can be divided into multiple smaller areas, each smaller area being a base station subsystem (eg, a small indoor base station (RRH:)).
  • Communication services can also be provided by Remote Radio Head).
  • the term "cell” or “sector” refers to part or all of the coverage area of at least one of the base stations and base station subsystems that provide communication services in this coverage. Point to.
  • MS Mobile Station
  • UE User Equipment
  • Mobile stations can be used by those skilled in the art as subscriber stations, mobile units, subscriber units, wireless units, remote units, mobile devices, wireless devices, wireless communication devices, remote devices, mobile subscriber stations, access terminals, mobile terminals, wireless. It may also be referred to as a terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable term.
  • At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a communication device, or the like. At least one of the base station and the mobile station may be a device mounted on the mobile body, the mobile body itself, or the like.
  • the moving body may be a vehicle (for example, a car, an airplane, etc.), an unmanned moving body (for example, a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned type). ) May be.
  • at least one of the base station and the mobile station includes a device that does not necessarily move during communication operation.
  • at least one of the base station and the mobile station may be an IoT (Internet of Things) device such as a sensor.
  • IoT Internet of Things
  • the base station in the present disclosure may be read by the user terminal.
  • the communication between the base station and the user terminal is replaced with the communication between a plurality of terminals 20 (for example, it may be called D2D (Device-to-Device), V2X (Vehicle-to-Everything), etc.).
  • D2D Device-to-Device
  • V2X Vehicle-to-Everything
  • Each aspect / embodiment of the present disclosure may be applied to the configuration.
  • the terminal 20 may have the function of the base station 10 described above.
  • words such as "up” and “down” may be read as words corresponding to communication between terminals (for example, "side”).
  • an uplink channel, a downlink channel, and the like may be read as a side channel.
  • the user terminal in the present disclosure may be read as a base station.
  • the base station may have the functions of the user terminal described above.
  • determining and “determining” used in this disclosure may include a wide variety of actions.
  • “Judgment” and “decision” are, for example, judgment (judging), calculation (calculating), calculation (computing), processing (processing), derivation (deriving), investigation (investigating), search (looking up, search, inquiry). (For example, searching in a table, database or another data structure), ascertaining may be regarded as “judgment” or “decision”.
  • judgment and “decision” are receiving (for example, receiving information), transmitting (for example, transmitting information), input (input), output (output), and access.
  • Accessing (for example, accessing data in memory) may be regarded as "judgment” or “decision”.
  • judgment and “decision” mean that the things such as solving, selecting, choosing, establishing, and comparing are regarded as “judgment” and “decision”. Can include. That is, “judgment” and “decision” may include considering some action as “judgment” and “decision”. Further, “judgment (decision)” may be read as “assuming”, “expecting”, “considering” and the like.
  • connection means any direct or indirect connection or connection between two or more elements, and each other. It can include the presence of one or more intermediate elements between two “connected” or “combined” elements.
  • the connection or connection between the elements may be physical, logical, or a combination thereof.
  • connection may be read as "access”.
  • the two elements use at least one of one or more wires, cables and printed electrical connections, and, as some non-limiting and non-comprehensive examples, the radio frequency domain. Can be considered to be “connected” or “coupled” to each other using electromagnetic energies having wavelengths in the microwave and light (both visible and invisible) regions.
  • the reference signal can also be abbreviated as RS (Reference Signal), and may be called a pilot (Pilot) depending on the applicable standard.
  • RS Reference Signal
  • Pilot Pilot
  • references to elements using designations such as “first” and “second” as used in this disclosure does not generally limit the quantity or order of those elements. These designations can be used in the present disclosure as a convenient way to distinguish between two or more elements. Thus, references to the first and second elements do not mean that only two elements can be adopted, or that the first element must somehow precede the second element.
  • the wireless frame may be composed of one or more frames in the time domain. Each one or more frames in the time domain may be referred to as a subframe. Subframes may further consist of one or more slots in the time domain.
  • the subframe may have a fixed time length (eg, 1 ms) that does not depend on numerology.
  • the numerology may be a communication parameter that applies to at least one of the transmission and reception of a signal or channel.
  • Numerology includes, for example, subcarrier spacing (SCS: SubCarrier Spacing), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI: Transmission Time Interval), number of symbols per TTI, wireless frame configuration, and transceiver.
  • SCS SubCarrier Spacing
  • TTI Transmission Time Interval
  • TTI Transmission Time Interval
  • transceiver At least one of a specific filtering process performed in the frequency domain, a specific windowing process performed by the transceiver in the time domain, and the like may be indicated.
  • the slot may be composed of one or more symbols in the time domain (OFDM (Orthogonal Frequency Division Multiplexing) symbol, SC-FDMA (Single Carrier Frequency Division Multiple Access) symbol, etc.). Slots may be time units based on new melody.
  • OFDM Orthogonal Frequency Division Multiplexing
  • SC-FDMA Single Carrier Frequency Division Multiple Access
  • the slot may include a plurality of mini slots. Each minislot may consist of one or more symbols in the time domain. Further, the mini slot may be referred to as a sub slot. A minislot may consist of a smaller number of symbols than the slot.
  • a PDSCH (or PUSCH) transmitted in a time unit larger than the minislot may be referred to as a PDSCH (or PUSCH) mapping type A.
  • the PDSCH (or PUSCH) transmitted using the minislot may be referred to as the PDSCH (or PUSCH) mapping type B.
  • the wireless frame, subframe, slot, minislot and symbol all represent the time unit when transmitting a signal.
  • the radio frame, subframe, slot, minislot and symbol may have different names corresponding to each.
  • one subframe may be called a transmission time interval (TTI), a plurality of consecutive subframes may be called TTI, and one slot or one minislot may be called TTI.
  • TTI transmission time interval
  • the unit representing TTI may be called a slot, a mini slot, or the like instead of a subframe.
  • TTI refers to, for example, the minimum time unit of scheduling in wireless communication.
  • the base station schedules each terminal 20 to allocate radio resources (frequency bandwidth that can be used in each terminal 20, transmission power, etc.) in TTI units.
  • the definition of TTI is not limited to this.
  • the TTI may be a transmission time unit such as a channel-encoded data packet (transport block), a code block, or a code word, or may be a processing unit such as scheduling or link adaptation.
  • the time interval for example, the number of symbols
  • the transport block, code block, code word, etc. may be shorter than the TTI.
  • one or more TTIs may be the minimum time unit for scheduling. Further, the number of slots (number of mini-slots) constituting the minimum time unit of the scheduling may be controlled.
  • a TTI having a time length of 1 ms may be referred to as a normal TTI (TTI in LTE Rel. 8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, a long subframe, a slot, or the like.
  • TTIs shorter than normal TTIs may be referred to as shortened TTIs, short TTIs, partial TTIs (partial or fractional TTIs), shortened subframes, short subframes, minislots, subslots, slots, and the like.
  • the long TTI (for example, normal TTI, subframe, etc.) may be read as a TTI having a time length of more than 1 ms, and the short TTI (for example, shortened TTI, etc.) is less than the TTI length of the long TTI and 1 ms. It may be read as a TTI having the above TTI length.
  • the resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may include one or a plurality of continuous subcarriers in the frequency domain.
  • the number of subcarriers contained in the RB may be the same regardless of the numerology, and may be, for example, 12.
  • the number of subcarriers contained in the RB may be determined based on numerology.
  • the time domain of the RB may include one or more symbols, and may have a length of 1 slot, 1 mini slot, 1 subframe, or 1 TTI.
  • Each 1TTI, 1 subframe, etc. may be composed of one or a plurality of resource blocks.
  • One or more RBs include a physical resource block (PRB: Physical RB), a sub-carrier group (SCG: Sub-Carrier Group), a resource element group (REG: Resource Element Group), a PRB pair, an RB pair, and the like. May be called.
  • PRB Physical resource block
  • SCG Sub-Carrier Group
  • REG Resource Element Group
  • PRB pair an RB pair, and the like. May be called.
  • 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 area of 1 subcarrier and 1 symbol.
  • Bandwidth part (which may also be called partial bandwidth) may represent a subset of consecutive common resource blocks (RBs) for a certain neurology in a carrier.
  • the common RB may be specified by the index of the RB with respect to the common reference point of the carrier.
  • PRBs may be defined in a BWP and numbered within that BWP.
  • the BWP may include a BWP for UL (UL BWP) and a BWP for DL (DL BWP).
  • UL BWP UL BWP
  • DL BWP DL BWP
  • One or more BWPs may be set in one carrier for the terminal 20.
  • At least one of the set BWPs may be active, and the terminal 20 does not have to assume that a predetermined signal / channel is transmitted / received outside the active BWP.
  • “cell”, “carrier” and the like in this disclosure may be read as “BWP”.
  • the above-mentioned structures such as wireless frames, subframes, slots, minislots and symbols are merely examples.
  • the number of subframes contained in a wireless frame the number of slots per subframe or wireless frame, the number of minislots contained in a slot, the number of symbols and RBs contained in a slot or minislot, and included in the RB.
  • the number of subcarriers, the number of symbols in the TTI, the symbol length, the cyclic prefix (CP) length, and the like can be changed in various ways.
  • the term "A and B are different” may mean “A and B are different from each other”.
  • the term may mean that "A and B are different from C”.
  • Terms such as “separate” and “combined” may be interpreted in the same way as “different”.
  • the notification of predetermined information (for example, the notification of "being X") is not limited to the explicit one, but is performed implicitly (for example, the notification of the predetermined information is not performed). May be good.
  • X in the present disclosure is an example of the first parameter.
  • Y is an example of the second parameter.
  • Base station 110 Transmission unit 120 Reception unit 130 Setting unit 140 Control unit 20 Terminal 210 Transmission unit 220 Reception unit 230 Setting unit 240 Control unit 1001 Processor 1002 Storage device 1003 Auxiliary storage device 1004 Communication device 1005 Input device 1006 Output device

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Abstract

Équipement utilisateur comprenant : une unité de réception destinée à recevoir des informations de réservation de ressource transmises par un autre équipement utilisateur par l'intermédiaire d'une fenêtre de détection ; et une unité de commande destinée à sélectionner, à partir d'une fenêtre de sélection de ressource, une ressource à utiliser pour la transmission, sur la base des informations de réservation de ressource. L'unité de commande sélectionne, à partir d'une première fenêtre de sélection de ressource, une première ressource devant être utilisée pour une transmission initiale, et sélectionne, à partir d'une seconde fenêtre de sélection de ressource, une seconde ressource à utiliser pour une retransmission correspondant à la transmission initiale.
PCT/JP2020/005668 2020-02-13 2020-02-13 Équipement utilisateur et procédé de communication Ceased WO2021161482A1 (fr)

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Cited By (1)

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Publication number Priority date Publication date Assignee Title
WO2023024957A1 (fr) * 2021-08-26 2023-03-02 华为技术有限公司 Procédé et appareil de communication

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