WO2019216745A1 - Procédé de transmission et de réception d'un canal physique partagé de liaison descendante dans un système de communication sans fil et dispositif conçu pour prendre en charge ledit procédé - Google Patents

Procédé de transmission et de réception d'un canal physique partagé de liaison descendante dans un système de communication sans fil et dispositif conçu pour prendre en charge ledit procédé Download PDF

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Publication number
WO2019216745A1
WO2019216745A1 PCT/KR2019/095007 KR2019095007W WO2019216745A1 WO 2019216745 A1 WO2019216745 A1 WO 2019216745A1 KR 2019095007 W KR2019095007 W KR 2019095007W WO 2019216745 A1 WO2019216745 A1 WO 2019216745A1
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pdsch
information
transmission
base station
uplink
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PCT/KR2019/095007
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English (en)
Korean (ko)
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이현호
곽규환
이승민
이윤정
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엘지전자 주식회사
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Publication of WO2019216745A1 publication Critical patent/WO2019216745A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • 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
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling

Definitions

  • the present disclosure relates to a wireless communication system, and more particularly, to a method for transmitting and receiving a physical downlink shared channel (PDSCH) repetition and a device supporting the same.
  • PDSCH physical downlink shared channel
  • Mobile communication systems have been developed to provide voice services while ensuring user activity.
  • the mobile communication system has expanded not only voice but also data service.As a result of the explosive increase in traffic, a shortage of resources and users are demanding higher speed services, a more advanced mobile communication system is required. have.
  • An object of the present specification is to provide a method for improving PDSCH transmission / reception reliability in a PDSCH repetition operation.
  • a method performed by a terminal includes receiving an upper layer signal from a base station, the upper layer signal including first information about a configuration of a PDSCH repetition related operation, and a UL-DL configuration associated with an uplink-downlink configuration.
  • Receiving second information from the base station receiving downlink control information (DCI) from the base station, the downlink control information including the PDSCH repetition number related information based on the first information, and the second information.
  • DCI downlink control information
  • the The method may further include continuously receiving the PDSCH after one or more transmission time units.
  • each of the one or more transmission time units may be a subslot, a slot, a subframe, a special subframe, or an UpPTS.
  • the second information may be included in the higher layer signal or a physical downlink control channel (PDCCH).
  • PDCH physical downlink control channel
  • the terminal for receiving a physical downlink shared channel (PDSCH) in the wireless communication system of the present specification includes a transceiver for transmitting and receiving a radio signal, and a processor functionally connected to the transceiver
  • the processor may receive a higher layer signal from the base station, the upper layer signal including first information about a configuration of a PDSCH repetition related operation, and receive second information related to a UL-DL configuration.
  • DCI Receive Downlink Control Information
  • the base station receives Downlink Control Information (DCI) from the base station and received from the base station, the downlink control information (DCI) including the PDSCH repetition number related information based on the first information, and based on the second information and the DCI Repeatedly receiving the PDSCH from a base station, and one or more for uplink transmission during repeated reception of the PDSCH If the transmission time units are present, it can be controlled so as to determine on the basis of the duration of the one or more transmission time units to continue to receive repeatedly the PDSCH.
  • DCI Receive Downlink Control Information
  • the processor stops the repeated reception of the PDSCH, and the duration of the one or more transmission time units is a specific time. If less than one, it may be controlled to continuously receive the PDSCH after the one or more transmission time units.
  • each of the one or more transmission time units may be a subslot, a slot, a subframe, a special subframe, or an UpPTS.
  • the second information may be included in the higher layer signal or a physical downlink control channel (PDCCH).
  • PDCH physical downlink control channel
  • the base station for transmitting a physical downlink shared channel (PDSCH) in the wireless communication system of the present specification includes a transceiver for transmitting and receiving a radio signal, and a processor functionally connected to the transceiver
  • the processor transmits an upper layer signal including first information about a configuration of a PDSCH repetition related operation to a terminal and transmits second information related to uplink-downlink configuration (UL-DL configuration).
  • Downlink Control Information (DCI) is transmitted to the terminal and includes downlink control information (DCI) including information related to the number of PDSCH repetitions to the terminal, the PDSCH is repeatedly transmitted to the terminal, and the uplink is transmitted during the repeated transmission of the PDSCH. If there are one or more transmission time units for link transmission, the phase is based on the duration of the one or more transmission time units. It can be controlled to determine whether to continue to repeatedly transfer the PDSCH.
  • DCI downlink Control Information
  • the processor stops repetitive transmission of the PDSCH when the duration of the one or more transmission time units is greater than or equal to a specific time, and the duration of the one or more transmission time units is less than a specific time.
  • the PDSCH may be continuously transmitted repeatedly after the one or more transmission time units.
  • each of the one or more transmission time units may be a subslot, a slot, a subframe, a special subframe, or an UpPTS.
  • the second information may be included in the higher layer signal or a physical downlink control channel (PDCCH).
  • PDCH physical downlink control channel
  • FIG. 1 illustrates a structure of a radio frame in a wireless communication system to which the present invention can be applied.
  • FIG. 2 is a diagram illustrating a resource grid for one downlink slot in a wireless communication system to which the present invention can be applied.
  • FIG. 3 shows a structure of a downlink subframe in a wireless communication system to which the present invention can be applied.
  • FIG. 4 shows a structure of an uplink subframe in a wireless communication system to which the present invention can be applied.
  • Figure 5 shows an example of the overall system structure of the NR to which the method proposed in this specification can be applied.
  • FIG. 6 illustrates a relationship between an uplink frame and a downlink frame in a wireless communication system to which the method proposed in the present specification can be applied.
  • FIG. 7 shows an example of a frame structure in an NR system.
  • FIG. 8 shows an example of a resource grid supported by a wireless communication system to which the method proposed in this specification can be applied.
  • FIG. 9 shows examples of an antenna port and a number-specific resource grid to which the method proposed in this specification can be applied.
  • FIG. 10 shows an example of a self-contained structure to which the method proposed in this specification can be applied.
  • FIG. 11 illustrates an example in which physical uplink control channel (PUCCH) formats are mapped to a PUCCH region of an uplink physical resource block in a wireless communication system to which the present invention can be applied.
  • PUCCH physical uplink control channel
  • CQI channel quality indicator
  • CP general cyclic prefix
  • FIG. 13 shows a structure of an ACK / NACK channel in case of a normal CP in a wireless communication system to which the present invention can be applied.
  • FIG. 14 shows an example of transport channel processing of an uplink shared channel (UL-SCH) in a wireless communication system to which the present invention can be applied.
  • UL-SCH uplink shared channel
  • FIG. 15 shows an example of a signal processing procedure of an uplink shared channel which is a transport channel in a wireless communication system to which the present invention can be applied.
  • 16 shows an example of generating and transmitting five SC-FDMA symbols during one slot in a wireless communication system to which the present invention can be applied.
  • FIG. 17 shows an ACK / NACK channel structure for PUCCH format 3 having a general cyclic prefix (CP).
  • CP general cyclic prefix
  • FIG. 18 is a diagram for describing a method of assuming PDSCH transmission to which the same precoder is applied when a terminal misses a physical layer signal indicating a transmission direction.
  • 19 is a flowchart illustrating a method of operating a terminal proposed in the present specification.
  • 20 is a flowchart illustrating a method of operating a base station proposed in the present specification.
  • FIG. 21 illustrates a block diagram of a wireless communication device to which the methods proposed herein can be applied.
  • 22 is a block diagram illustrating a communication device according to one embodiment of the present invention.
  • FIG. 23 is a diagram illustrating an example of an RF module of a wireless communication device to which a method proposed in this specification can be applied.
  • FIG. 24 is a diagram illustrating still another example of an RF module of a wireless communication device to which a method proposed in this specification can be applied.
  • 25 is a diagram illustrating an example of a signal processing module to which the methods proposed in the specification can be applied.
  • FIG. 26 is a diagram illustrating another example of a signal processing module to which the methods proposed herein may be applied.
  • FIG. 26 is a diagram illustrating another example of a signal processing module to which the methods proposed herein may be applied.
  • a base station has a meaning as a terminal node of a network that directly communicates with a terminal.
  • the specific operation described as performed by the base station in this document may be performed by an upper node of the base station in some cases. That is, it is obvious that various operations performed for communication with a terminal in a network composed of a plurality of network nodes including a base station may be performed by the base station or other network nodes other than the base station.
  • a 'base station (BS)' may be replaced by terms such as a fixed station, a Node B, an evolved-NodeB (eNB), a base transceiver system (BTS), an access point (AP), and the like. .
  • a 'terminal' may be fixed or mobile, and may include a user equipment (UE), a mobile station (MS), a user terminal (UT), a mobile subscriber station (MSS), a subscriber station (SS), and an AMS ( Advanced Mobile Station (WT), Wireless Terminal (WT), Machine-Type Communication (MTC) Device, Machine-to-Machine (M2M) Device, Device-to-Device (D2D) Device, etc.
  • UE user equipment
  • MS mobile station
  • UT user terminal
  • MSS mobile subscriber station
  • SS subscriber station
  • AMS Advanced Mobile Station
  • WT Wireless Terminal
  • MTC Machine-Type Communication
  • M2M Machine-to-Machine
  • D2D Device-to-Device
  • downlink means communication from a base station to a terminal
  • uplink means communication from a terminal to a base station.
  • a transmitter may be part of a base station, and a receiver may be part of a terminal.
  • a transmitter may be part of a terminal and a receiver may be part of a base station.
  • CDMA code division multiple access
  • FDMA frequency division multiple access
  • TDMA time division multiple access
  • OFDMA orthogonal frequency division multiple access
  • SC-FDMA single carrier frequency division multiple access
  • GSM global system for mobile communications
  • GPRS general packet radio service
  • EDGE enhanced data rates for GSM evolution
  • OFDMA may be implemented in a wireless technology such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, evolved UTRA (E-UTRA).
  • UTRA is part of a universal mobile telecommunications system (UMTS).
  • 3rd generation partnership project (3GPP) long term evolution (LTE) is a part of evolved UMTS (E-UMTS) using E-UTRA, and employs OFDMA in downlink and SC-FDMA in uplink.
  • LTE-A (advanced) is the evolution of 3GPP LTE.
  • Embodiments of the present invention may be supported by standard documents disclosed in at least one of IEEE 802, 3GPP, and 3GPP2, which are wireless access systems. That is, steps or parts which are not described to clearly reveal the technical spirit of the present invention among the embodiments of the present invention may be supported by the above documents. In addition, all terms disclosed in the present document can be described by the above standard document.
  • FIG. 1 illustrates a structure of a radio frame in a wireless communication system to which the present invention can be applied.
  • 3GPP LTE / LTE-A supports a type 1 radio frame structure applicable to frequency division duplex (FDD) and a type 2 radio frame structure applicable to time division duplex (TDD).
  • FDD frequency division duplex
  • TDD time division duplex
  • Type 1A illustrates the structure of a type 1 radio frame.
  • Type 1 radio frames may be applied to both full duplex and half duplex FDD.
  • a radio frame consists of 10 subframes.
  • One subframe consists of two consecutive slots in the time domain, and subframe i consists of slot 2i and slot 2i + 1.
  • the time taken to transmit one subframe is called a transmission time interval (TTI).
  • TTI transmission time interval
  • one subframe may have a length of 1 ms and one slot may have a length of 0.5 ms.
  • uplink transmission and downlink transmission are distinguished in the frequency domain. While there is no restriction on full-duplex FDD, the terminal cannot simultaneously transmit and receive in half-duplex FDD operation.
  • One slot includes a plurality of orthogonal frequency division multiplexing (OFDM) symbols in the time domain and a plurality of resource blocks (RBs) in the frequency domain. Since 3GPP LTE uses OFDMA in downlink, the OFDM symbol is for representing one symbol period. The OFDM symbol may be referred to as one SC-FDMA symbol or symbol period.
  • a resource block is a resource allocation unit and includes a plurality of consecutive subcarriers in one slot.
  • FIG. 1B illustrates a frame structure type 2.
  • an uplink-downlink configuration is a rule indicating whether uplink and downlink are allocated (or reserved) for all subframes.
  • Table 1 shows an uplink-downlink configuration.
  • 'D' represents a subframe for downlink transmission
  • 'U' represents a subframe for uplink transmission
  • 'S' represents a downlink pilot.
  • a special subframe consisting of three fields: Time Slot, Guard Period (GP), and Uplink Pilot Time Slot (UpPTS).
  • DwPTS indicates initial cell search, synchronization, or channel estimation in a UE. Used for UpPTS is used for channel estimation at the base station and synchronization of uplink transmission of the terminal.
  • GP is a section for removing interference caused in the uplink due to the multipath delay of the downlink signal between the uplink and the downlink.
  • the uplink-downlink configuration can be classified into seven types, and the location and / or number of downlink subframes, special subframes, and uplink subframes are different for each configuration.
  • Switch-point periodicity refers to a period in which an uplink subframe and a downlink subframe are repeatedly switched in the same manner, and both 5ms or 10ms are supported.
  • the special subframe S exists every half-frame, and in case of having a period of 5ms downlink-uplink switching time, it exists only in the first half-frame.
  • subframes 0 and 5 and DwPTS are sections for downlink transmission only.
  • the subframe immediately following the UpPTS and the subframe subframe is always an interval for uplink transmission.
  • the uplink-downlink configuration may be known to both the base station and the terminal as system information.
  • the base station may notify the terminal of the change of the uplink-downlink allocation state of the radio frame by transmitting only an index of the configuration information.
  • the configuration information is a kind of downlink control information, which may be transmitted through a physical downlink control channel (PDCCH) like other scheduling information, and is commonly transmitted to all terminals in a cell through a broadcast channel as broadcast information. May be
  • PDCCH physical downlink control channel
  • Table 2 shows the configuration of the special subframe (length of DwPTS / GP / UpPTS).
  • the structure of a radio frame according to the example of FIG. 1 is just one example, and the number of subcarriers included in the radio frame or the number of slots included in the subframe and the number of OFDM symbols included in the slot may vary. Can be.
  • FIG. 2 is a diagram illustrating a resource grid for one downlink slot in a wireless communication system to which the present invention can be applied.
  • one downlink slot includes a plurality of OFDM symbols in the time domain.
  • one downlink slot includes seven OFDM symbols, and one resource block includes 12 subcarriers in a frequency domain, but is not limited thereto.
  • Each element on the resource grid is a resource element, and one resource block (RB) includes 12 ⁇ 7 resource elements.
  • the number N ⁇ DL of resource blocks included in the downlink slot depends on the downlink transmission bandwidth.
  • the structure of the uplink slot may be the same as the structure of the downlink slot.
  • FIG. 3 shows a structure of a downlink subframe in a wireless communication system to which the present invention can be applied.
  • up to three OFDM symbols in the first slot in a subframe are control regions to which control channels are allocated, and the remaining OFDM symbols are data regions to which PDSCH (Physical Downlink Shared Channel) is allocated. data region).
  • PDSCH Physical Downlink Shared Channel
  • An example of a downlink control channel used in 3GPP LTE includes a physical control format indicator channel (PCFICH), a physical downlink control channel (PDCCH), a physical hybrid-ARQ indicator channel (PHICH), and the like.
  • the PCFICH is transmitted in the first OFDM symbol of a subframe and carries information about the number of OFDM symbols (ie, the size of the control region) used for transmission of control channels within the subframe.
  • the PHICH is a response channel for the uplink and carries an ACK (Acknowledgement) / NACK (Not-Acknowledgement) signal for a hybrid automatic repeat request (HARQ).
  • Control information transmitted through the PDCCH is called downlink control information (DCI).
  • the downlink control information includes uplink resource allocation information, downlink resource allocation information or an uplink transmission (Tx) power control command for a certain terminal group.
  • the PDCCH is a resource allocation and transmission format of DL-SCH (Downlink Shared Channel) (also called a downlink grant), resource allocation information of UL-SCH (Uplink Shared Channel) (also called an uplink grant), and PCH ( Paging information in paging channel, system information in DL-SCH, resource allocation for upper-layer control message such as random access response transmitted in PDSCH, arbitrary terminal It may carry a set of transmission power control commands for the individual terminals in the group, activation of Voice over IP (VoIP), and the like.
  • the plurality of PDCCHs may be transmitted in the control region, and the terminal may monitor the plurality of PDCCHs.
  • the PDCCH consists of a set of one or a plurality of consecutive CCEs.
  • CCE is a logical allocation unit used to provide a PDCCH with a coding rate according to the state of a radio channel.
  • the CCE corresponds to a plurality of resource element groups.
  • the format of the PDCCH and the number of available bits of the PDCCH are determined according to the association between the number of CCEs and the coding rate provided by the CCEs.
  • the base station determines the PDCCH format according to the DCI to be transmitted to the terminal, and attaches a CRC (Cyclic Redundancy Check) to the control information.
  • the CRC is masked with a unique identifier (referred to as RNTI (Radio Network Temporary Identifier)) according to the owner or purpose of the PDCCH.
  • RNTI Radio Network Temporary Identifier
  • a unique identifier of the terminal for example, a C-RNTI (Cell-RNTI) may be masked to the CRC.
  • a paging indication identifier for example, P-RNTI (P-RNTI) may be masked to the CRC.
  • the system information more specifically, the PDCCH for the system information block (SIB), the system information identifier and the system information RNTI (SI-RNTI) may be masked to the CRC.
  • SI-RNTI system information RNTI
  • RA-RNTI random access-RNTI
  • Enhanced PDCCH carries UE-specific signaling.
  • the EPDCCH is located in a physical resource block (PRB) that is UE-specifically configured.
  • PRB physical resource block
  • the PDCCH may be transmitted in up to three OFDM symbols in the first slot in the subframe, but the EPDCCH may be transmitted in a resource region other than the PDCCH.
  • the start time (ie, symbol) of the EPDCCH in the subframe may be configured in the terminal through higher layer signaling (eg, RRC signaling, etc.).
  • EPDCCH is a transport format associated with the DL-SCH, resource allocation and HARQ information, a transport format associated with the UL-SCH, resource allocation and HARQ information, resource allocation associated with Side-link Shared Channel (SL-SCH) and Physical Sidelink Control Channel (PSCCH) Can carry information, etc.
  • Multiple EPDCCHs may be supported and the UE may monitor a set of EPCCHs.
  • the EPDCCH may be transmitted using one or more consecutive enhanced CCEs (ECCEs), and the number of ECCEs per single EPDCCH may be determined for each EPDCCH format.
  • ECCEs enhanced CCEs
  • Each ECCE may be composed of a plurality of enhanced resource element groups (EREGs).
  • EREG is used to define the mapping of ECCE to RE.
  • the terminal may monitor the plurality of EPDCCHs. For example, one or two EPDCCH sets in one PRB pair in which the UE monitors EPDCCH transmission may be configured.
  • the EPCCH may use localized transmission or distributed transmission, so that the mapping of ECCE to the RE in the PRB may be different.
  • FIG. 4 shows a structure of an uplink subframe in a wireless communication system to which the present invention can be applied.
  • an uplink subframe may be divided into a control region and a data region in the frequency domain.
  • a physical uplink control channel (PUCCH) carrying uplink control information is allocated to the control region.
  • the data region is allocated a Physical Uplink Shared Channel (PUSCH) that carries user data.
  • PUCCH Physical Uplink Control Channel
  • PUSCH Physical Uplink Shared Channel
  • a PUCCH for one UE is allocated a resource block (RB) pair in a subframe.
  • RBs belonging to the RB pair occupy different subcarriers in each of the two slots.
  • This RB pair allocated to the PUCCH is said to be frequency hopping at the slot boundary (slot boundary).
  • the invention proposed herein may be applied not only to LTE / LTE-A system (or device) but also to 5G NR system (or device).
  • 5G NR systems define Enhanced Mobile Broadband (eMBB), Massive Machine Type Communications (MMTC), Ultra-Reliable and Low Latency Communications (URLLC), and vehicle-to-everything (V2X) based on usage scenarios (such as service type). do.
  • eMBB Enhanced Mobile Broadband
  • MMTC Massive Machine Type Communications
  • URLLC Ultra-Reliable and Low Latency Communications
  • V2X vehicle-to-everything
  • the 5G NR standard is divided into standalone (SA) and non-standalone (NSA) according to co-existence between the NR system and the LTE system.
  • the 5G NR system supports various subcarrier spacings, and supports CP-OFDM in downlink, CP-OFDM and DFT-s-OFDM in uplink.
  • Embodiments of the present invention may be supported by standard documents disclosed in at least one of IEEE 802, 3GPP, and 3GPP2, which are wireless access systems. That is, steps or parts which are not described to clearly reveal the technical spirit of the present invention among the embodiments of the present invention may be supported by the above documents. In addition, all terms disclosed in the present document can be described by the above standard document.
  • next-generation wireless access technologies can provide faster service to more users than traditional communication systems (or traditional radio access technologies) (e.g., enhanced mobile broadband communication). ) Needs to be considered.
  • a design of a communication system considering a machine type communication (MTC) that provides a service by connecting a plurality of devices and objects has been discussed.
  • a design of a communication system eg, Ultra-Reliable and Low Latency Communication (URLLC)
  • URLLC Ultra-Reliable and Low Latency Communication
  • NR New RAT
  • NR system the radio communication system to which the NR is applied.
  • eLTE eNB An eLTE eNB is an evolution of an eNB that supports connectivity to EPC and NGC.
  • gNB Node that supports NR as well as connection with NGC.
  • New RAN A radio access network that supports NR or E-UTRA or interacts with NGC.
  • Network slice A network slice defined by the operator to provide an optimized solution for specific market scenarios that require specific requirements with end-to-end coverage.
  • Network function is a logical node within a network infrastructure with well-defined external interfaces and well-defined functional behavior.
  • NG-C Control plane interface used for the NG2 reference point between the new RAN and NGC.
  • NG-U User plane interface used for the NG3 reference point between the new RAN and NGC.
  • Non-standalone NR A deployment configuration where a gNB requires an LTE eNB as an anchor for control plane connection to EPC or an eLTE eNB as an anchor for control plane connection to NGC.
  • Non-Standalone E-UTRA Deployment configuration in which the eLTE eNB requires gNB as an anchor for control plane connection to NGC.
  • User plane gateway The endpoint of the NG-U interface.
  • Figure 5 shows an example of the overall system structure of the NR to which the method proposed in this specification can be applied.
  • the NG-RAN consists of gNBs that provide control plane (RRC) protocol termination for the NG-RA user plane (new AS sublayer / PDCP / RLC / MAC / PHY) and user equipment (UE). do.
  • RRC control plane
  • the gNBs are interconnected via an X n interface.
  • the gNB is also connected to the NGC via an NG interface.
  • the gNB is connected to an Access and Mobility Management Function (AMF) through an N2 interface and to a User Plane Function (UPF) through an N3 interface.
  • AMF Access and Mobility Management Function
  • UPF User Plane Function
  • the numerology may be defined by subcarrier spacing and cyclic prefix overhead.
  • multiple subcarrier spacings can be derived by scaling the basic subcarrier spacing to an integer N (or ⁇ ). Further, even if it is assumed that very low subcarrier spacing is not used at very high carrier frequencies, the used numerology may be selected independently of the frequency band.
  • OFDM Orthogonal Frequency Division Multiplexing
  • OFDM numerologies supported in the NR system may be defined as shown in Table 3.
  • the size of the various fields in the time domain Is expressed as a multiple of the time unit. From here, ego, to be.
  • Downlink and uplink transmissions It consists of a radio frame having a section of (radio frame).
  • each radio frame is It consists of 10 subframes having a section of.
  • FIG. 6 shows an uplink frame and a downlink frame in a wireless communication system to which the method proposed in the present specification can be applied. Indicates a relationship between
  • the transmission of an uplink frame number i from a user equipment (UE) is greater than the start of the corresponding downlink frame at the corresponding UE. You must start before.
  • slots within a subframe Numbered in increasing order of within a radio frame They are numbered in increasing order of.
  • Slot in subframe Start of OFDM symbol in the same subframe Is aligned with the beginning of time.
  • Not all terminals can transmit and receive at the same time, which means that not all OFDM symbols of a downlink slot or an uplink slot can be used.
  • Table 4 shows the number of OFDM symbols per slot in a normal CP. ), The number of slots per radio frame ( ), The number of slots per subframe ( Table 5 shows the number of OFDM symbols per slot, the number of slots per radio frame, and the number of slots per subframe in the extended CP.
  • the number of slot (s) present can be defined as shown in Table 2.
  • mini-slot may consist of two, four or seven symbols, and may consist of more or fewer symbols.
  • an antenna port In relation to physical resources in the NR system, an antenna port, a resource grid, a resource element, a resource block, a carrier part, etc. Can be considered.
  • the antenna port is defined so that the channel on which the symbol on the antenna port is carried can be inferred from the channel on which another symbol on the same antenna port is carried. If the large-scale property of the channel on which a symbol on one antenna port is carried can be deduced from the channel on which the symbol on another antenna port is carried, then the two antenna ports are quasi co-located or QC / QCL. quasi co-location relationship.
  • the wide range characteristics include one or more of delay spread, Doppler spread, frequency shift, average received power, and received timing.
  • FIG. 8 shows an example of a resource grid supported by a wireless communication system to which the method proposed in this specification can be applied.
  • the resource grid is in the frequency domain
  • one subframe includes 14 x 2 ⁇ u OFDM symbols, but is not limited thereto.
  • the transmitted signal is One or more resource grids composed of subcarriers, and Is described by the OFDM symbols of. From here, to be. remind Denotes the maximum transmission bandwidth, which may vary between uplink and downlink as well as numerologies.
  • the numerology And one resource grid for each antenna port p.
  • FIG. 9 shows examples of an antenna port and a number-specific resource grid to which the method proposed in this specification can be applied.
  • each element of the resource grid for antenna port p is referred to as a resource element and is an index pair Uniquely identified by From here, Is the index on the frequency domain, Refers to the position of a symbol within a subframe. Index pair when referring to a resource element in a slot This is used. From here, to be.
  • Numerology Resource elements for antenna and antenna port p Is a complex value Corresponds to If there is no risk of confusion, or if no specific antenna port or numerology is specified, the indices p and Can be dropped, so the complex value is or This can be
  • a physical resource block may be located in the frequency domain. It is defined as consecutive subcarriers.
  • Point A serves as a common reference point of the resource block grid and can be obtained as follows.
  • OffsetToPointA for the PCell downlink indicates the frequency offset between the lowest subcarrier of the lowest resource block and point A overlapping with the SS / PBCH block used by the UE for initial cell selection, and a 15 kHz subcarrier spacing for FR1 and Expressed in resource block units assuming a 60 kHz subcarrier spacing for FR2;
  • absoluteFrequencyPointA indicates the frequency-location of point A expressed as in absolute radio-frequency channel number (ARFCN).
  • Common resource blocks set subcarrier spacing It is numbered from zero up in the frequency domain for.
  • the time division duplex (TDD) structure considered in the NR system is a structure that processes both uplink (UL) and downlink (DL) in one slot (or subframe). This is to minimize latency of data transmission in a TDD system, and the structure may be referred to as a self-contained structure or a self-contained slot.
  • 10 shows an example of a self-contained structure to which the method proposed in this specification can be applied. 10 is merely for convenience of description and does not limit the scope of the invention.
  • one transmission unit eg, slot, subframe
  • OFDM Orthogonal Frequency Division Multiplexing
  • region 1002 denotes a downlink control region
  • region 1004 denotes an uplink control region.
  • regions other than the region 1002 and the region 1004 may be used for transmitting downlink data or uplink data.
  • uplink control information and downlink control information may be transmitted in one self-contained slot.
  • uplink data or downlink data may be transmitted in one self-contained slot.
  • downlink transmission and uplink transmission may proceed sequentially, and transmission of downlink data and reception of uplink ACK / NACK may be performed.
  • a process of switching from a transmission mode to a reception mode by a base station (eNodeB, eNB, gNB) and / or a terminal (User Equipment) a time gap for switching from a reception mode to a transmission mode is required.
  • some OFDM symbol (s) may be set to a guard period (GP).
  • PUCCH Physical Uplink Control Channel
  • the uplink control information (UCI) transmitted through the PUCCH may include a scheduling request (SR), HARQ ACK / NACK information, and downlink channel measurement information.
  • SR scheduling request
  • HARQ ACK / NACK information HARQ ACK / NACK information
  • HARQ ACK / NACK information may be generated according to whether the decoding of the downlink data packet on the PDSCH is successful.
  • one bit is transmitted as ACK / NACK information for downlink single codeword transmission, and two bits are transmitted as ACK / NACK information for downlink 2 codeword transmission.
  • Channel measurement information refers to feedback information related to a multiple input multiple output (MIMO) technique, and includes channel quality indicator (CQI), precoding matrix index (PMI), and rank indicator (RI). : Rank Indicator) may be included. These channel measurement information may be collectively expressed as CQI.
  • CQI channel quality indicator
  • PMI precoding matrix index
  • RI rank indicator
  • 20 bits per subframe may be used for transmission of the CQI.
  • PUCCH may be modulated using Binary Phase Shift Keying (BPSK) and Quadrature Phase Shift Keying (QPSK).
  • Control information of a plurality of terminals may be transmitted through a PUCCH, and a constant amplitude zero autocorrelation (CAZAC) sequence having a length of 12 is performed when code division multiplexing (CDM) is performed to distinguish signals of respective terminals.
  • CAZAC sequence has a characteristic of maintaining a constant amplitude in the time domain and the frequency domain, the coverage is reduced by reducing the Peak-to-Average Power Ratio (PAPR) or the Cubic Metric (CM) of the UE. It has a suitable property to increase.
  • PAPR Peak-to-Average Power Ratio
  • CM Cubic Metric
  • ACK / NACK information for downlink data transmission transmitted through the PUCCH is covered using an orthogonal sequence or an orthogonal cover (OC).
  • control information transmitted on the PUCCH may be distinguished using a cyclically shifted sequence having different cyclic shift (CS) values.
  • the cyclically shifted sequence may be generated by cyclically shifting a base sequence by a specific cyclic shift amount.
  • the specific CS amount is indicated by the cyclic shift index (CS index).
  • the number of cyclic shifts available may vary depending on the delay spread of the channel.
  • Various kinds of sequences may be used as the base sequence, and the above-described CAZAC sequence is one example.
  • control information that can be transmitted in one subframe by the UE depends on the number of SC-FDMA symbols available for transmission of the control information (that is, RS transmission for coherent detection of PUCCH). SC-FDMA symbols except for the SC-FDMA symbol used).
  • PUCCH is defined in seven different formats according to transmitted control information, modulation scheme, amount of control information, and the like, and according to uplink control information (UCI) transmitted according to each PUCCH format,
  • UCI uplink control information
  • PUCCH format 1 is used for single transmission of SR. In case of SR-only transmission, an unmodulated waveform is applied, which will be described later in detail.
  • PUCCH format 1a or 1b is used for transmission of HARQ ACK / NACK. When HARQ ACK / NACK is transmitted alone in any subframe, PUCCH format 1a or 1b may be used. Alternatively, HARQ ACK / NACK and SR may be transmitted in the same subframe using PUCCH format 1a or 1b.
  • PUCCH format 2 is used for transmission of CQI
  • PUCCH format 2a or 2b is used for transmission of CQI and HARQ ACK / NACK.
  • PUCCH format 2 may be used for transmission of CQI and HARQ ACK / NACK.
  • FIG. 11 shows an example of a form in which PUCCH formats are mapped to a PUCCH region of an uplink physical resource block in a wireless communication system to which the present invention can be applied.
  • N_RB ⁇ UL denotes the number of resource blocks in uplink
  • 0, 1, ..., N_RB ⁇ UL-1 denotes the number of physical resource blocks.
  • the PUCCH is mapped to both edges of the uplink frequency block.
  • the number of PUCCH RBs (N_RB ⁇ (2)) usable by the PUCCH format 2 / 2a / 2b may be indicated to terminals in a cell by broadcasting signaling.
  • PUCCH format 2 / 2a / 2b is a control channel for transmitting channel measurement feedback (CQI, PMI, RI).
  • the reporting period of the channel measurement feedback (hereinafter, collectively referred to as CQI information) and the frequency unit (or frequency resolution) to be measured may be controlled by the base station.
  • CQI information channel measurement feedback
  • the frequency unit (or frequency resolution) to be measured may be controlled by the base station.
  • Periodic and aperiodic CQI reporting can be supported in the time domain.
  • PUCCH format 2 may be used only for periodic reporting and PUSCH may be used for aperiodic reporting.
  • the base station may instruct the terminal to transmit an individual CQI report on a resource scheduled for uplink data transmission.
  • FIG. 12 shows a structure of a CQI channel in the case of a general CP in a wireless communication system to which the present invention can be applied.
  • SC-FDMA symbols 0 to 6 of one slot SC-FDMA symbols 1 and 5 (second and sixth symbols) are used for demodulation reference signal (DMRS) transmission, and CQI in the remaining SC-FDMA symbols. Information can be transmitted. Meanwhile, in the case of an extended CP, one SC-FDMA symbol (SC-FDMA symbol 3) is used for DMRS transmission.
  • SC-FDMA symbol 3 SC-FDMA symbol 3
  • DMRS Reference signal
  • CQI information is carried on the remaining five SC-FDMA symbols.
  • Two RSs are used in one slot to support a high speed terminal.
  • each terminal is distinguished using a cyclic shift (CS) sequence.
  • the CQI information symbols are modulated and transmitted throughout the SC-FDMA symbol, and the SC-FDMA symbol is composed of one sequence. That is, the terminal modulates and transmits the CQI in each sequence.
  • the number of symbols that can be transmitted in one TTI is 10, and modulation of CQI information is determined up to QPSK.
  • QPSK mapping is used for an SC-FDMA symbol, a 2-bit CQI value may be carried, and thus a 10-bit CQI value may be loaded in one slot. Therefore, a CQI value of up to 20 bits can be loaded in one subframe.
  • a frequency domain spread code is used to spread the CQI information in the frequency domain.
  • a length-12 CAZAC sequence (eg, a ZC sequence) may be used.
  • Each control channel may be distinguished by applying a CAZAC sequence having a different cyclic shift value.
  • IFFT is performed on the frequency domain spread CQI information.
  • 12 different terminals may be orthogonally multiplexed on the same PUCCH RB by means of 12 equally spaced cyclic shifts.
  • the DMRS sequence on SC-FDMA symbol 1 and 5 (on SC-FDMA symbol 3 in extended CP case) in the general CP case is similar to the CQI signal sequence on the frequency domain but no modulation such as CQI information is applied.
  • PUCCH resource index ( ) Is information indicating a PUCCH region used for PUCCH format 2 / 2a / 2b transmission and a cyclic shift (CS) value to be used.
  • the PUCCH formats 1a and 1b will be described.
  • a symbol modulated using a BPSK or QPSK modulation scheme is multiply multiplied by a CAZAC sequence having a length of 12.
  • the y (0), ..., y (N-1) symbols may be referred to as a block of symbols.
  • a Hadamard sequence of length 4 is used for general ACK / NACK information, and a Discrete Fourier Transform (DFT) sequence of length 3 is used for shortened ACK / NACK information and a reference signal.
  • DFT Discrete Fourier Transform
  • a Hadamard sequence of length 2 is used for the reference signal in the case of an extended CP.
  • FIG. 13 shows a structure of an ACK / NACK channel in case of a normal CP in a wireless communication system to which the present invention can be applied.
  • FIG. 13 exemplarily shows a PUCCH channel structure for HARQ ACK / NACK transmission without CQI.
  • a reference signal RS is carried on three consecutive SC-FDMA symbols in the middle of seven SC-FDMA symbols included in one slot, and an ACK / NACK signal is carried on the remaining four SC-FDMA symbols.
  • RS may be carried on two consecutive symbols in the middle.
  • the number and position of symbols used for the RS may vary depending on the control channel, and the number and position of symbols used for the ACK / NACK signal associated therewith may also be changed accordingly.
  • 1 bit and 2 bit acknowledgment information may be represented by one HARQ ACK / NACK modulation symbol using BPSK and QPSK modulation techniques, respectively.
  • the acknowledgment (ACK) may be encoded as '1'
  • the negative acknowledgment (NACK) may be encoded as '0'.
  • two-dimensional spreading is applied to increase the multiplexing capacity. That is, frequency domain spreading and time domain spreading are simultaneously applied to increase the number of terminals or control channels that can be multiplexed.
  • a frequency domain sequence is used as the base sequence.
  • one of the CAZAC sequences may be a Zadoff-Chu (ZC) sequence.
  • ZC Zadoff-Chu
  • CS cyclic shifts
  • k The number of CS resources supported in an SC-FDMA symbol for PUCCH RBs for HARQ ACK / NACK transmission is set by the cell-specific higher-layer signaling parameter (k).
  • the frequency domain spread ACK / NACK signal is spread in the time domain using an orthogonal spreading code.
  • an orthogonal spreading code a Walsh-Hadamard sequence or a DFT sequence may be used.
  • the ACK / NACK signal may be spread using orthogonal sequences w0, w1, w2, and w3 of length 4 for four symbols.
  • RS is also spread through an orthogonal sequence of length 3 or length 2. This is called orthogonal covering (OC).
  • a plurality of terminals may be multiplexed using a code division multiplexing (CDM) scheme using the CS resource in the frequency domain and the OC resource in the time domain as described above. That is, ACK / NACK information and RS of a large number of terminals may be multiplexed on the same PUCCH RB.
  • CDM code division multiplexing
  • the number of spreading codes supported for ACK / NACK information is limited by the number of RS symbols. That is, since the number of RS transmission SC-FDMA symbols is smaller than the number of ACK / NACK information transmission SC-FDMA symbols, the multiplexing capacity of the RS is smaller than that of the ACK / NACK information.
  • ACK / NACK information may be transmitted in four symbols.
  • three orthogonal spreading codes are used instead of four, which means that the number of RS transmission symbols is three. This is because only three orthogonal spreading codes can be used for the RS.
  • HARQ acknowledgments from a total of 18 different terminals can be multiplexed within one PUCCH RB.
  • HARQ acknowledgments from a total of 12 different terminals can be multiplexed within one PUCCH RB.
  • the scheduling request SR is transmitted in such a manner that the terminal requests or does not request to be scheduled.
  • the SR channel reuses the ACK / NACK channel structure in PUCCH formats 1a / 1b and is configured in an OOK (On-Off Keying) scheme based on the ACK / NACK channel design. Reference signals are not transmitted in the SR channel. Therefore, a sequence of length 7 is used for a general CP, and a sequence of length 6 is used for an extended CP. Different cyclic shifts or orthogonal covers may be assigned for SR and ACK / NACK. That is, for positive SR transmission, the UE transmits HARQ ACK / NACK through resources allocated for SR. In order to transmit a negative SR, the UE transmits HARQ ACK / NACK through a resource allocated for ACK / NACK.
  • the e-PUCCH may correspond to PUCCH format 3 of the LTE-A system.
  • Block spreading can be applied to ACK / NACK transmission using PUCCH format 3.
  • FIG. 14 shows an example of transport channel processing of a UL-SCH in a wireless communication system to which the present invention can be applied.
  • Cubic Metric is designed to maintain good single carrier transmission. That is, in the case of PUSCH transmission in the existing LTE system, the single carrier characteristics are maintained through DFT-precoding for data to be transmitted, and in the case of PUCCH transmission, information is transmitted on a sequence having a single carrier characteristic to transmit single carrier characteristics. I can keep it. However, when the DFT-precoding data is discontinuously allocated on the frequency axis or when PUSCH and PUCCH are simultaneously transmitted, this single carrier characteristic is broken.
  • uplink control information (UCI) information to be transmitted to the PUCCH is transmitted together with data through the PUSCH in order to maintain a single carrier characteristic.
  • a method of multiplexing uplink control information (UCI) (CQI / PMI, HARQ-ACK, RI, etc.) in a PUSCH region in a subframe in which a PUSCH is transmitted use.
  • UCI uplink control information
  • UL-SCH data and CQI / PMI are multiplexed before DFT-spreading and control information. You can send data together.
  • UL-SCH data performs rate-matching in consideration of CQI / PMI resources.
  • control information such as HARQ ACK, RI, and the like is multiplexed in the PUSCH region by puncturing UL-SCH data.
  • FIG. 15 shows an example of a signal processing procedure of an uplink shared channel which is a transport channel in a wireless communication system to which the present invention can be applied.
  • UL-SCH uplink shared channel
  • the UL-SCH transmits data to a coding unit in the form of a transport block (TB) once every transmission time interval (TTI).
  • TB transport block
  • TTI transmission time interval
  • CRC parity bits P_0 to P_L-1 are attached to bits a_0 to a_A-1 of the transport block received from the upper layer.
  • A is the size of the transport block
  • L is the number of parity bits.
  • Input bits with a CRC are the same as b_0 ⁇ b_B-1.
  • B represents the number of bits of the transport block including the CRC.
  • b_0 to b_B-1 are segmented into a plurality of code blocks (CBs) according to the TB size, and a CRC is attached to the divided CBs.
  • CBs code blocks
  • a CRC is attached to the divided CBs.
  • bits are equal to c_r0 to c_r (Kr-1).
  • Kr is the number of bits according to code block r.
  • C represents the total number of code blocks.
  • channel coding is performed.
  • the output bits after channel coding are the same as d_r0 ⁇ (i) to d_r (Dr-1) ⁇ (i).
  • i is an encoded stream index and may have a value of 0, 1, or 2.
  • Dr represents the number of bits of the i th coded stream for the code block r.
  • Each code block may be encoded by turbo coding, respectively.
  • Rate Matching is performed.
  • the bits after the rate matching are the same as e_r0 to e_r (Er-1).
  • Er represents the number of rate matched bits of the r th code block.
  • the bits after combining the code blocks are equal to f_0 to f_G-1.
  • G represents the total number of encoded bits for transmission, and when the control information is multiplexed with the UL-SCH transmission, the number of bits used for transmission of the control information is not included.
  • control information when control information is transmitted in the PUSCH, channel coding is independently performed on the control information CQI / PMI, RI, and ACK / NACK. Since different coded symbols are allocated for transmission of each control information, each control information has a different coding rate.
  • the ACK / NACK information bit is composed of 1 bit or 2 bits
  • the ACK / NACK multiplexing is composed of 1 to 4 bits.
  • multiplexing of the coded bits f_0 to f_G-1 of the UL-SCH data and the coded bits q_0 to q_ (N_L * Q_CQI-1) of the CQI / PMI is performed.
  • the multiplexed result of data and CQI / PMI is equal to g_0 ⁇ g_H'-1.
  • N_L represents the number of layers to which UL-SCH transport blocks are mapped
  • H represents the total number of encoded bits allocated for UL-SCH data and CQI / PMI information to N_L transport layers to which transport blocks are mapped.
  • the multiplexed data, CQI / PMI, separately channel-coded RI, and ACK / NACK are channel interleaved to generate an output signal.
  • a plurality of PDCCHs may be transmitted in one subframe. That is, the control region of one subframe includes a plurality of CCEs having indices 0 to N_ (CCE, k) -1.
  • N_ (CCE, k) -1 means the total number of CCEs in the control region of the kth subframe.
  • the UE monitors the plurality of PDCCHs in every subframe. Here, monitoring means that the UE attempts to decode each of the PDCCHs according to the monitored PDCCH format.
  • the base station does not provide information on where the PDCCH corresponding to the UE is.
  • blind decoding refers to a method in which a UE de-masks its UE ID in a CRC portion and then checks the CRC error to determine whether the corresponding PDCCH is its control channel.
  • the UE monitors the PDCCH of every subframe in order to receive data transmitted to the UE.
  • the UE wakes up in the monitoring interval of every DRX cycle and monitors the PDCCH in a subframe corresponding to the monitoring interval.
  • a subframe in which PDCCH monitoring is performed is called a non-DRX subframe.
  • the UE In order to receive the PDCCH transmitted to the UE, the UE must perform blind decoding on all CCEs present in the control region of the non-DRX subframe. Since the UE does not know which PDCCH format is to be transmitted, it is necessary to decode all PDCCHs at the possible CCE aggregation level until blind decoding of the PDCCH is successful in every non-DRX subframe. Since the UE does not know how many CCEs the PDCCH uses for itself, the UE should attempt detection at all possible CCE aggregation levels until the blind decoding of the PDCCH succeeds. That is, the UE performs blind decoding for each CCE aggregation level. That is, the terminal attempts to decode the CCE aggregation level unit as 1 first.
  • the decoding is attempted with a CCE aggregation level unit of 2. After that, the CCE aggregation level unit 4 is decoded and the CCE aggregation level unit 8 is decoded. In addition, the UE attempts blind decoding for all four C-RNTI, P-RNTI, SI-RNTI, and RA-RNTI. In addition, the UE attempts blind decoding for all DCI formats to be monitored.
  • the search space means a PDCCH candidate set for monitoring and may have a different size according to each PDCCH format.
  • the search space may include a common search space (CSS) and a UE-specific / dedicated search space (USS).
  • CCS common search space
  • USS dedicated search space
  • all terminals can know the size of the common search space, but the terminal specific search space can be set individually for each terminal. Accordingly, the UE needs to monitor both the UE-specific search space and the common search space in order to decode the PDCCH, thus performing a maximum of 44 blind decoding (BDs) in one subframe. This does not include blind decoding performed according to different CRC values (eg, C-RNTI, P-RNTI, SI-RNTI, RA-RNTI).
  • CRC values eg, C-RNTI, P-RNTI, SI-RNTI, RA-RNTI
  • the base station may be unable to secure the CCE resources for transmitting the PDCCH to all of the terminals to transmit the PDCCH in a given subframe. This is because resources remaining after the CCE location is allocated may not be included in the search space of a specific UE.
  • a terminal specific hopping sequence may be applied to the starting point of the terminal specific search space to minimize this barrier that may continue to the next subframe.
  • Table 7 shows the sizes of the common search space and the terminal specific search space.
  • the UE does not simultaneously perform searches according to all defined DCI formats.
  • the UE may always search for DCI formats 0 and 1A in the UE-specific search space.
  • the DCI formats 0 and 1A have the same size, but the UE may distinguish the DCI formats by using a flag used for distinguishing the DCI formats 0 and 1A included in the PDCCH.
  • a DCI format other than 0 and 1A may be required for the UE. Examples of DCI formats include 1, 1B, and 2.
  • the UE may search for DCI formats 1A and 1C.
  • the UE may be configured to search for DCI format 3 or 3A, and DCI formats 3 and 3A have the same size as DCI formats 0 and 1A, but the UE is a CRC scrambled by an identifier other than the UE specific identifier. DCI format can be distinguished using.
  • Search space S_k ⁇ (L) is the aggregation level PDCCH candidate set according to the.
  • the CCE according to the PDCCH candidate set m of the search space may be determined by Equation 3 below.
  • the UE monitors both the UE-specific search space and the common search space to decode the PDCCH.
  • the common search space (CSS) supports PDCCHs having an aggregation level of ⁇ 4, 8 ⁇
  • the UE specific search space supports PDCCHs having an aggregation level of ⁇ 1, 2, 4, 8 ⁇ . .
  • Table 8 shows PDCCH candidates monitored by the UE.
  • Y_k is defined as in Equation 4.
  • the PUCCH An ACK / NACK multiplexing method based on resource selection may be considered.
  • the contents of ACK / NACK responses for multiple data units are identified by the combination of the PUCCH resource and the resource of QPSK modulation symbols used for the actual ACK / NACK transmission.
  • the ACK / NACK result may be identified at the eNB as shown in Table 9 below.
  • HARQ-ACK (i) represents the ACK / NACK results for the i-th data unit (data unit).
  • DTX Discontinuous Transmission
  • b (0) and b (1) are two bits transmitted using the selected PUCCH.
  • the terminal transmits two bits (1, 1) using n_ (PUCCH, 1) ⁇ (1).
  • the UE If the UE fails to decode in the first and third data units and decodes in the second and fourth data units, the UE transmits bit (1, 0) using n_ (PUCCH, 1) ⁇ (3).
  • ACK / NACK channel selection if there is at least one ACK, the NACK and the DTX are coupled. This is because a combination of reserved PUCCH resources and QPSK symbols cannot indicate all ACK / NACK states. However, in the absence of an ACK, the DTX decouples from the NACK.
  • the PUCCH resource linked to the data unit corresponding to one explicit NACK may also be reserved for transmitting signals of multiple ACK / NACKs.
  • the LTE-A system considers transmitting a plurality of ACK / NACK information / signals for a plurality of PDSCHs transmitted through a plurality of DL CCs through a specific component carrier (UL CC).
  • UL CC specific component carrier
  • channel coding eg, Reed-Muller code, Tail-biting convolutional code, etc.
  • a plurality of ACK / NACK information It may be considered to transmit a plurality of ACK / NACK information / signals using a PUCCH format 2 or a new PUCCH format (ie, an E-PUCCH format) based on block-spreading.
  • the block spreading scheme modulates control signal transmission using the SC-FDMA scheme.
  • a symbol sequence may be spread and transmitted on a time domain using an orthogonal cover code (OCC).
  • OCC orthogonal cover code
  • control signals of a plurality of terminals may be multiplexed on the same RB.
  • one symbol sequence is transmitted over a time domain and control signals of a plurality of terminals are multiplexed using a cyclic shift (CS) of a CAZAC sequence
  • a block spread based PUCCH format for example, In the case of PUCCH format 3
  • one symbol sequence is transmitted over a frequency domain, and control signals of a plurality of terminals are multiplexed using time-domain spreading using OCC.
  • 16 shows an example of generating and transmitting five SC-FDMA symbols during one slot in a wireless communication system to which the present invention can be applied.
  • two RS symbols may be used for one slot.
  • an RS symbol may be generated from a CAZAC sequence to which a specific cyclic shift value is applied, and may be transmitted in a form in which a predetermined OCC is applied (or multiplied) over a plurality of RS symbols.
  • a predetermined OCC is applied (or multiplied) over a plurality of RS symbols.
  • control information having an extended size can be transmitted as compared to the PUCCH format 1 series and 2 series.
  • a channel coding-based ACK / NACK transmission method using PUCCH format 2 or E-PUCCH format is called a multi-bit ACK / NACK coding transmission method.
  • This method shows a method of transmitting an ACK / NACK coded block generated by channel coding ACK / NACK or discontinuous transmission (DTX) information (which means that a PDCCH cannot be received / detected) for PDSCHs of a plurality of DL CCs.
  • DTX discontinuous transmission
  • a UE operates in a SU-MIMO mode in a certain DL CC and receives two codewords (CW), ACK / ACK, ACK / NACK, NACK / ACK, and NACK / NACK for each CC for each CC.
  • a total of four feedback states may be transmitted or may have up to five feedback states including up to DTX.
  • the UE receives a single CW, it may have up to three states of ACK, NACK, and DTX (if the NACK is processed in the same way as DTX, two states of ACK, NACK / DTX) May have).
  • the UE may have up to 55 transmittable feedback states, and the ACK / NACK payload size for expressing them may be
  • the total number of bits is 12 bits (if the DTX is processed in the same way as NACK, the number of feedback states is 45, and the size of the ACK / NACK payload to express the total is 10 bits).
  • ACK / NACK multiplexing ie, ACK / NACK selection
  • it basically corresponds to a PDCCH scheduling each PDSCH of a corresponding UE to secure PUCCH resources of each UE.
  • an implicit ACK / NACK selection method that uses implicit PUCCH resources (ie, linked with the lowest CCE index).
  • the LTE-A FDD system considers a plurality of ACK / NACK transmissions for a plurality of PDSCHs transmitted through a plurality of DL CCs through one specific UL CC that is basically UE-specific.
  • Implicit PUCCH resources or corresponding implicits that are linked to the PDCCH scheduling certain or some or all DL CCs ie, linked to the lowest CCE index n_CCE, or linked to n_CCE and n_CCE + 1).
  • n_CCE the lowest CCE index
  • n_CCE + 1 the lowest CCE index
  • a situation in which a plurality of CCs are aggregated (that is, CA) may be considered. Accordingly, a plurality of DL subframes and a plurality of PDSCHs transmitted through the plurality of CCs may be considered. It is considered to transmit a plurality of ACK / NACK information / signal for a specific CC (that is, A / N CC) in an UL subframe corresponding to the plurality of DL subframes.
  • a method of transmitting a plurality of ACK / NACKs corresponding to the maximum number of CWs that can be transmitted through all CCs allocated to the UE for all of the plurality of DL subframes that is, SF
  • SF the plurality of DL subframes
  • To reduce the total number of transmitted ACK / NACK by considering full ACK / NACK or by applying ACK / NACK bundling to CW and / or CC and / or SF domains (I.e., bundled ACK / NACK) may be considered (in the case of CW bundling, this means applying ACK / NACK bundling for CW for each DL SF for each DL SF, and for each DL for CC bundling).
  • ACK / NACK bundling for all or some CCs is applied to SF
  • SF bundling means applying ACK / NACK bundling for all or some DL SFs to each CC.
  • all PDSCH or DL received for each CC Bit (grant) for the PDCCH by the total number of ACK indicating the CC (or some ACK number) may consider the ACK- counter (counter) mode).
  • multi-bit ACK / NACK encoding according to the ACK / NACK payload for each UE that is, the size of the ACK / NACK payload for full or bundled ACK / NACK transmission set for each UE ACK / NACK transmission scheme based on multi-bit ACK / NACK coding) or ACK / NACK selection can be configurably applied.
  • the LTE-A system supports transmitting a plurality of ACK / NACK information / signals for a plurality of PDSCHs transmitted through a plurality of DL CCs through a specific UL CC.
  • a plurality of ACK / NACK information can be transmitted through PUCCH format 3.
  • FIG. 17 shows an ACK / NACK channel structure for PUCCH format 3 having a general cyclic prefix (CP).
  • CP general cyclic prefix
  • a symbol sequence is transmitted in a time-domain spread by an orthogonal cover code (OCC), and multiplexing control signals of several UEs in the same RB using the OCC.
  • OCC orthogonal cover code
  • PUCCH format 2 one symbol sequence is transmitted over a time domain and UE multiplexing is performed using a cyclic shift of a CAZAC sequence
  • PUCCH format 3 one symbol sequence is transmitted over a frequency domain and OCC based UE multiplexing is performed using time-domain spreading.
  • Spreading factor 5
  • the RS symbol may be generated from a CAZAC sequence having a specific cyclic shift, and may be transmitted in a form in which a specific OCC is applied (ie, multiplied) to a plurality of RS symbols in the time domain.
  • a specific OCC is applied (ie, multiplied) to a plurality of RS symbols in the time domain.
  • Such a channel coding-based multiple ACK / NACK transmission scheme using PUCCH format 2 or E-PUCCH format is called a “multi-bit ACK / NACK coding” transmission method.
  • This method shows a method of transmitting an ACK / NACK coded block generated by channel coding ACK / NACK or DTX information (meaning that a PDCCH cannot be received / detected) for PDSCHs of a plurality of DL CCs.
  • a UE operates in SU-MIMO mode in a DL CC and receives two codewords (CW)
  • CW codewords
  • a feedback state may be transmitted or may have up to five feedback states including DTX.
  • a UE receives a single CW, it may have a maximum of three states of ACK, NACK, and DTX (if it processes NACK in the same way as DTX, it may have a total of two states of ACK, NACK / DTX).
  • the terminal may have a maximum of 55 transmittable feedback states, and the size of the ACK / NACK payload to represent the total is 12 bits (if For example, if the DTX is processed in the same way as NACK, the number of feedback states is 45, and the total ACK / NACK payload size is 10 bits.
  • ACK / NACK multiplexing (ie ACK / NACK selection) method applied to the existing Rel-8 TDD system basically corresponding to the PDCCH scheduling each PDSCH of the UE to secure the PUCCH resources of each UE (ie lowest)
  • an implicit ACK / NACK selection method using an implicit PUCCH resource (linked with a CCE index).
  • the LTE-A FDD system considers a plurality of ACK / NACK transmissions for a plurality of PDSCHs transmitted through a plurality of DL CCs through one specific UL CC that is basically UE-specific.
  • Each UE linked to an implicit PUCCH resource ie, linked to the lowest CCE index n_CCE, or linked to n_CCE and n_CCE + 1) or a corresponding implicit PUCCH resource and RRC signaling, linked to a PDCCH scheduling some or all DL CCs.
  • an implicit PUCCH resource ie, linked to the lowest CCE index n_CCE, or linked to n_CCE and n_CCE + 1
  • a corresponding implicit PUCCH resource and RRC signaling linked to a PDCCH scheduling some or all DL CCs.
  • a situation in which a plurality of CCs are aggregated may be considered. Accordingly, a plurality of ACK / NACK information / signals for a plurality of DLSCHs and a plurality of PDSCHs transmitted through the plurality of CCs may be considered. In this case, it is considered to transmit a specific CC (ie A / N CC) in a UL subframe corresponding to the plurality of DL subframes.
  • a specific CC ie A / N CC
  • CW bundling it means applying ACK / NACK bundling for CW for each DL SF for each DL SF, and in case of CC bundling, applying ACK / NACK bundling for all or some CC for each DL SF.
  • ACK / NACK bundling for all or some DL SFs is applied to each CC
  • SF bundling method for all PDSCH or DL grant PDCCHs received for each CC Total number of ACKs per CC (or Consider an "ACK-counter" method that informs some number of ACKs).
  • ACK / NACK payload for each UE that is, ACK based on “multi-bit ACK / NACK coding” or “ACK / NACK selection” according to the size of ACK / NACK payload for full or bundled ACK / NACK transmission set for each UE / NACK transmission scheme can be applied configurable.
  • Next-generation wireless communication systems use a wide frequency band and aim to support a variety of services or requirements.
  • 3GPP's New Radio (NR) requirement which is one of the representative scenarios of Ultra Reliable and Low Latency Communications (URLLC), which provides 0.5 ms of user plane latency and X bytes of data within 10 ms. ⁇ -5
  • URLLC Ultra Reliable and Low Latency Communications
  • a low latency, high reliability requirement may need to be transmitted within an error rate.
  • the traffic of URLLC is characterized in that the file size is within tens to hundreds of bytes and occurs sporadically.
  • URLLC requires a short scheduling time unit and a reliable transmission method.
  • a reference time unit assumed and / or used for transmitting and receiving a physical channel may be variously set according to an application or a type of traffic.
  • the reference time may be a basic unit for scheduling a specific physical channel.
  • the reference time unit may vary according to the number of symbols and / or subcarrier spacing that constitutes the scheduling unit.
  • the slot may be, for example, a scheduling basic unit used for general data traffic (eg, eMBB).
  • eMBB general data traffic
  • the mini-slot may have a smaller time interval than the slot in the time domain. It may also be the basic unit of scheduling used in more specific traffic or communication schemes (eg URLLC, unlicensed band or millimeter wave).
  • an operation method (hereinafter, referred to as a first embodiment) and a higher layer signal or SIB in a repetitive transmission operation
  • the operation method (hereinafter, the second embodiment) of the terminal is proposed.
  • the slots, subframes, frames, and the like mentioned in the embodiments described herein may correspond to specific examples of time units used in the wireless communication system. Can be. That is, in applying the methods proposed herein, the time unit may be replaced with other time units applied in another wireless communication system.
  • Time domain repetition may be considered. That is, a transmission time interval (TTI), slot, and / or symbol for the purpose of high reliability and / or short latency of a particular transport block (TB) and / or code block (CB) group. Repetition of units may be applied to the channel.
  • the repetition may be semi-persistent scheduling (SPS) or PDCCH-less channel transmission similar to SPS, may be similar to TTI bundling, and UL to a resource previously configured through a higher layer signal considered in NR. (uplink) may be in the form of grant-free UL channel repetitive transmission for transmitting the channel.
  • SPS semi-persistent scheduling
  • PDCCH-less channel transmission similar to SPS may be similar to TTI bundling
  • uplink may be in the form of grant-free UL channel repetitive transmission for transmitting the channel.
  • the number of consecutive downlink (DL) or uplink (UL) TTIs may be less than the set and / or indicated repetition times. In this case, waiting for the next transmission opportunity in the same direction may increase latency, which may not be desirable when demanding strict latency requirements.
  • the base station eg, eNB
  • the base station may initially adjust the number of repetitions, but in the case of semi-static based repetition, it may be difficult to freely adjust the number of repetitions.
  • rules may be defined, promised and / or set to stop the repetition if there are TTIs in different directions. And / or, in this case, only fewer transmissions may be possible than necessary to meet a particular reliability requirement, so that if the number of consecutive DLs or UL TTIs is less than the set and / or indicated repetitions, Rules may be defined, promised, and / or set such that open-loop power control parameters (eg, P_O, alpha) are applied to repetitive transmissions. And / or, an increase / decrease value for a separate TPC accumulation for a case where the number of consecutive DL or UL TTIs is less than the set and / or indicated number of repetitions may be defined and / or set.
  • open-loop power control parameters eg, P_O, alpha
  • the gap caused by this TTI (s) is caused by DMRS bundling and / or DMRS sharing.
  • Rules may be defined, promised, and / or set up to determine whether to continue or stop repetition by whether or not it is within a coherence time sufficient to apply. For example, if it is determined that performance is degraded when DMRS bundling is caused due to gaps caused by TTIs in different directions, the repetition may be stopped, and the repetition may be continued.
  • the maximum gap which is the basis of the determination, may be previously defined in units of TTIs, slots, and / or symbols, or may be set and / or indicated through higher layer signals or physical layer signals.
  • TTI During the repetition of transmission in a specific direction (DL or UL), when there are TTI (s) in different directions (e.g., UL, special subframe, short TTI in special subframe, part of special subframe during DL repetitive transmission), and / Or uplink pilot time slot (UpPTS)), rules may be defined, promised, and / or set to continue repetition in the TTI in that direction, except for the TTI (s) in that different direction.
  • TTI s
  • UL special subframe
  • short TTI in special subframe part of special subframe during DL repetitive transmission
  • UpPTS uplink pilot time slot
  • DL repetition starts at the first TTI and a total of four DLs are transmitted.
  • the terminal may define, promise, and / or set rules to perform the first three DL transmissions and the sixth DL transmission except for S and / or U.
  • D may mean DL
  • U may be UL
  • S may mean a special subframe or a short TTI in a special subframe.
  • the repetition is stopped according to the time duration length corresponding to the TTI (s) in different directions or It may be determined whether to skip the time duration corresponding to the TTI (s) in different directions and again to repeat the transmission. For example, when the time duration is greater than or equal to a certain time, repetition is stopped. When the time duration is less than or equal to a certain time, the repetitive transmission may be continued while skipping time duration corresponding to TTI (s) in different directions.
  • the repetition may be stopped or depending on the TTI (s) in different directions, depending on the TTI length. It may be determined whether to repeat the corresponding time duration and continue the repeated transmission again. In one example, the repetition stops because the latency may be too long for a TTI length above a certain length (e.g. subframe), and TTI (s) in different directions for a TTI length (e.g. slot) below and / or below a certain length. The time duration corresponding to this may be skipped and repeated transmission may continue.
  • a certain length e.g. subframe
  • a special subframe or a short TTI belonging to the DL is according to the length of a downlink pilot time slot (DwPTS) or an upPTS (or depending on the number of symbols in which the actual DL and / or UL in the TTI are transmitted). Or UL may be assumed. And / or a special subframe or a short TTI belonging to it is always assumed to be a transmission in a direction different from the direction of the repeating channel regardless of the length of the DwPTS or UpPTS, and is ignored or terminated when counting the number of repeating TTIs. And / or can be stopped.
  • DwPTS downlink pilot time slot
  • UpPTS UpPTS
  • slot-TTI when slot-TTI is configured, whether to support PDSCH transmission in a second slot in a subframe is determined according to the length of the DwPTS. Thus, slot-TTI in which PDSCH transmission is not supported (eg, special subframe configuration 1 and 2) is determined. , If 6, or 7 is set, the second slot of the DwPTS) is ignored when counting the number of repetitive TTIs, whereas the slot-TTI supported for PDSCH transmission (eg, when the special subframe configuration 3, 4, or 8 is set, is the second of the DwPTS) slot) A rule may be defined to receive a PDSCH in repetitive transmission, which is included in counting the number of repetitive TTIs.
  • the UE For the repetition of transmission of the DL PDSCH (or UL PUSCH), the UE transmits a TTI indicated by DL by a reference UL / DL configuration (eg, eimta-HARQ-ReferenceConfig-r12) configured through a higher layer signal,
  • a reference UL / DL configuration eg, eimta-HARQ-ReferenceConfig-r12
  • the rule defines, promises, and assumes that a PDSCH corresponding to repetition exists only (or only for a TTI, symbol, and / or time interval indicated by UL) for a symbol and / or time period (or a PUSCH is transmitted). And / or can be set.
  • a TTI in which a direction different from the link direction of repetitive transmission is set by a physical layer signal (e.g., PDCCH scrambling by eIMTA-RNTI) during repetition (e.g., UL is set for PDSCH repetitive transmission).
  • a physical layer signal e.g., PDCCH scrambling by eIMTA-RNTI
  • UL is set for PDSCH repetitive transmission.
  • the UE may define, promise, and / or set a rule to skip PDSCH decoding corresponding to repetition (or skip PUSCH transmission) for a corresponding TTI, symbol, and / or time interval. Can be.
  • the UE may only use TTI, symbol, and / or time interval indicated by DL by UL / DL configuration by SIB1 (or TTI, indicated by UL).
  • the rules may be defined, promised, and / or set up to assume that there is a PDSCH corresponding to repetition (or only for a time interval) and / or that a PUSCH is transmitted.
  • a TTI, a symbol, in which a direction different from the link direction of the repetitive transmission is set by a physical layer signal (for example, PDCCH scrambled by eIMTA-RNTI) (for example, UL is set in the case of PDSCH repetitive transmission)
  • a physical layer signal for example, PDCCH scrambled by eIMTA-RNTI
  • UL is set in the case of PDSCH repetitive transmission
  • / or the PDSCH corresponding to the repetition for the corresponding TTI, symbol, and / or time interval exists even if the time interval is changed in the same link direction (eg, if the UL TTI is changed to the DL TTI when PDSCH is being repeated).
  • Rules may be defined, promised, and / or set to assume no (or no PUSCH is sent).
  • the UE may define, promise, and / or set a rule to skip PDSCH decoding corresponding to repetition (or skip PUSCH transmission) for a corresponding TTI, symbol, and / or time period.
  • a symbol, TTI, and / or time that is UL in a UL / DL configuration set (semi-static) by an upper layer signal or SIB1 is DL
  • a physical layer signal eg, a PDCCH scrambled by an eIMTA-RNTI
  • TTI time
  • a rule may be defined, promised, and / or set to assume that a PDSCH corresponding to repetition exists (or a PUSCH is transmitted).
  • the UE Rules may be defined, promised, and / or set to assume that there is a PDSCH corresponding to repetition (or a PUSCH is transmitted) for the corresponding TTI, symbol, and / or time period.
  • the UE may skip PDSCH decoding for a TTI, a symbol, and / or a time interval in which a direction different from the link direction of repetitive transmission is set (for example, UL is set for PDSCH repetitive transmission) according to the configuration of SIB1 (or Rules may be defined, promised, and / or set up (i.e., may not count as repetition) to skip PUSCH transmissions.
  • a direction different from the link direction of repetitive transmission for example, UL is set for PDSCH repetitive transmission
  • SIB1 or Rules may be defined, promised, and / or set up (i.e., may not count as repetition) to skip PUSCH transmissions.
  • the UE may receive PDSCH (or transmit PUSCH) only as long as excluding the TTI, symbol, and / or time interval from the total number of indicated transmissions. It may be to receive a PDSCH (or transmit a PUSCH) less than the total number of transmissions.
  • DL may be referred to together including a "DwPTS" section (full or only first slot) of a special subframe in addition to "DL".
  • the UL may include the term “UpPTS” of the special subframe in addition to the "UL”.
  • the above methods are applied only when the eIMTA operation is configured for a carrier for which repeated transmission and reception in a specific link direction is configured, indicated, and / or scheduled (for example, when EIMTA-MainConfigServCell-r12 is configured). It may be.
  • the same precoder will be applied to PDSCH transmission in two adjacent special subframes to enable coherent channel estimation. Rules can be defined to make this assumption.
  • the special according to the changed UL / DL configuration setting Whether to apply the same precoder on a subframe basis may be determined and / or set. That is, the UE may assume that the same precoder will be applied to PDSCH transmission in two adjacent special subframes determined according to a physical layer signal (eg, PDCCH scrambled by eIMTA-RNTI).
  • the UE may assume that the same precoder will be applied to PDSCH transmission in two adjacent special subframes based on the special subframe according to the configuration of SIB1.
  • SIB1 Some kind of fallback operation
  • the UE indicates UL indicated by PDCCH as shown in FIG. 18 (a).
  • precoder may be assumed to be applied to DL TTIs based on the / DL configuration
  • the precoder to be applied to the DL TTIs based on the UL / DL configuration set by SIB1 as shown in FIG. 18 (b). Can be assumed.
  • the UE may always determine whether the same precoder is applied based on a special subframe according to configuration of SIB1 (eg, as shown in FIG. 18 (b)). That is, the UE may assume that the same precoder will always be applied to PDSCH transmission in two adjacent special subframes determined according to the configuration of SIB1.
  • the embodiments proposed herein may be implemented independently, but may be implemented in a combination (or merge) form of some embodiments.
  • the information on whether the embodiments are applied (or the information on the rules of the embodiments) is a rule to inform the base station through predefined signaling (eg, physical layer signaling and / or higher layer signaling, etc.) to the terminal. This may be defined and / or set.
  • 19 is a flowchart illustrating a method of operating a terminal proposed in the present specification.
  • a UE may receive an upper layer signal including first information on setting of a PDSCH repetition related operation from a base station (S1901).
  • the PDSCH repetition related operation may be a HARQ-less / blind (or HARQ-less and / or blind) PDSCH repetition operation.
  • the first information may be upper layer parameters blindSlotSubslotPDSCH-Repetitions and / or blindSubframePDSCH-Repetitions.
  • the terminal may receive second information related to uplink-downlink configuration (UL-DL configuration) from the base station (S1902).
  • UL-DL configuration uplink-downlink configuration
  • the terminal may confirm that the radio frame includes TTIs of ⁇ D, D, D, S, U, D, D ⁇ through the second information.
  • U denotes a subframe for uplink (UL) transmission
  • S denotes a special subframe
  • D denotes a subframe for downlink (DL) transmission.
  • the TTI has been described as having a subframe length, but is not limited thereto. The TTI may be set and / or defined in various lengths.
  • the second information may be included in the higher layer signal or a physical downlink control channel (PDCCH).
  • PDCH physical downlink control channel
  • the second information may be uplink-downlink configuration information.
  • the second information may be an upper layer parameter subframeAssignment.
  • the second information when the second information is included in the physical downlink control channel, the second information may be change related information of uplink-downlink configuration.
  • the PDCCH including the second information may be a PDCCH scrambled by CRC by Enhanced Interference Mitigation and Traffic Adaptation (eIMTA) -Radio Network Temporary Identifier (RNTI).
  • the terminal may receive information (eg, higher layer parameter EIMTA-MainConfigServCell-r12) regarding the configuration of the eIMTA operation before receiving the second information. That is, when the terminal is set to the upper layer parameter EIMTA-MainConfigServCell-r12, the terminal may receive (and / or monitor and decode) the PDCCH scrambled by the eIMTA-RNTI including the second information.
  • the UE may receive uplink-downlink configuration information (eg, higher layer parameter subframeAssignment) before receiving the second information included in the PDCCH.
  • uplink-downlink configuration information eg, higher layer parameter subframeAssignment
  • the terminal receiving the uplink-downlink configuration information may then receive the second information and perform PDSCH repetitive reception based on the uplink-downlink configuration changed by the second information.
  • the terminal may receive downlink control information (DCI) including the PDSCH repetition number related information (eg, a repetition number) from the base station based on the first information (S1903).
  • DCI downlink control information
  • the PDSCH repetition number related information eg, a repetition number
  • the PDSCH repetition number related information may exist when the first information is set.
  • the terminal may repeatedly receive the PDSCH from the base station based on the second information and the DCI (S1904).
  • the UE may check the Transmission Time Interval (TTI) for downlink transmission through the second information, and may repeatedly receive the PDSCH by checking the PDSCH repetition number through the DCI.
  • TTI Transmission Time Interval
  • the TTI may be referred to as a transmission time unit.
  • the terminal may determine whether to continuously receive the PDSCH based on a time duration of the one or more TTIs (S1905). ). For example, the UE may determine whether the duration of the one or more TTIs is greater than or equal to a preset specific time and determine whether to continue repeated PDSCH reception after the one or more TTIs.
  • each of the one or more TTIs may be a subslot, a slot, a subframe, a special subframe, or a part (eg, UpPTS) of the special subframe.
  • the UE may assume a special subframe as a subframe for uplink transmission, and calculate a duration by reporting one or more TTIs consisting of a continuous subframe and the special subframe as TTIs for uplink transmission. .
  • the UE may assume that the TTI for uplink transmission according to the length of the UpPTS and / or DwPTS.
  • the UE stops repeatedly receiving the PDSCH, and if the duration of the one or more TTIs is less than a specific time, the terminal continues the PDSCH after the one or more TTIs. Can be received repeatedly. That is, when the duration of the one or more TTIs is less than a specific time, the UE may repeatedly receive the PDSCH in the TTI for the next downlink transmission without expecting the PDSCH repeated reception in one or more TTIs for the uplink transmission. .
  • the specific time may be a preset time to satisfy the latency requirement.
  • the UE receives the PDSCH repetition number related information indicating four repetitions, and includes the TTI starting the repetitive reception through the second information (first TTI) so that seven consecutive TTIs are ⁇ D, D, D , S, U, D, D ⁇ .
  • the UE may repeatedly receive the PDSCH in TTIs for three consecutive downlink transmissions.
  • the terminal may confirm that there is one or more consecutive TTIs (S, U) for uplink transmission, and may verify the duration of the one or more consecutive TTIs (S, U). If the duration of the corresponding TTIs (S, U) is more than a preset specific time (for example, 1ms), the UE may stop the repeated PDSCH reception.
  • a preset specific time for example, 1ms
  • the UE may receive the remaining one PDSCH in the TTI (D) for the next downlink transmission.
  • S is assumed to be a subframe for uplink transmission, it may be assumed as a subframe for downlink transmission by the terminal.
  • the terminal checks the duration of the one or more TTIs, and It may be determined whether to repeatedly receive the PDSCH before the one or more TTIs or continue repeating the reception after the one or more TTIs, and may start to repeat the PDSCH.
  • the UE stops repeating the reception of the PDSCH and continues the PDSCH if it is shorter than the length of the subframe. Can be repeatedly received.
  • the present invention can improve latency performance in PDSCH repetition operation.
  • the present invention has been described based on downlink repetitive reception (PDSCH repetitive reception) in the above-described example, the present invention is not limited to downlink repetitive reception, and may be implemented through a terminal and / or a base station through uplink repetitive reception.
  • PDSCH repetitive reception downlink repetitive reception
  • the above-described operation of the terminal may be specifically implemented by the terminal device 2120 illustrated in FIG. 21 of the present specification.
  • the above-described operation of the terminal may be performed by the processor 2121 and / or the RF unit 2123.
  • the processor 2121 may receive an upper layer signal including a first information on setting of a PDSCH repetition related operation through an RF unit 2123 from a base station (S1901). .
  • the PDSCH repetition related operation may be a HARQ-less / blind (or HARQ-less and / or blind) PDSCH repetition operation.
  • the first information may be upper layer parameters blindSlotSubslotPDSCH-Repetitions and / or blindSubframePDSCH-Repetitions.
  • the processor 2121 may receive second information related to uplink-downlink configuration (UL-DL configuration) from the base station through the RF unit 2123 (S1902).
  • UL-DL configuration uplink-downlink configuration
  • the terminal may confirm that the radio frame includes TTIs of ⁇ D, D, D, S, U, D, D ⁇ through the second information.
  • U denotes a subframe for uplink (UL) transmission
  • S denotes a special subframe
  • D denotes a subframe for downlink (DL) transmission.
  • the TTI has been described as having a subframe length, but is not limited thereto. The TTI may be set and / or defined in various lengths.
  • the second information may be included in the higher layer signal or a physical downlink control channel (PDCCH).
  • PDCH physical downlink control channel
  • the second information may be uplink-downlink configuration information.
  • the second information may be an upper layer parameter subframeAssignment.
  • the second information when the second information is included in the physical downlink control channel, the second information may be change related information of uplink-downlink configuration.
  • the PDCCH including the second information may be a PDCCH scrambled by CRC by Enhanced Interference Mitigation and Traffic Adaptation (eIMTA) -Radio Network Temporary Identifier (RNTI).
  • the terminal may receive information (eg, higher layer parameter EIMTA-MainConfigServCell-r12) regarding the configuration of the eIMTA operation before receiving the second information. That is, when the terminal is set to the upper layer parameter EIMTA-MainConfigServCell-r12, the terminal may receive (and / or monitor and decode) the PDCCH scrambled by the eIMTA-RNTI including the second information.
  • the UE may receive uplink-downlink configuration information (eg, higher layer parameter subframeAssignment) before receiving the second information included in the PDCCH.
  • uplink-downlink configuration information eg, higher layer parameter subframeAssignment
  • the terminal receiving the uplink-downlink configuration information may then receive the second information and perform PDSCH repetitive reception based on the uplink-downlink configuration changed by the second information.
  • the processor 2121 receives downlink control information (DCI) from the base station through the RF unit 2123 based on the first information, the downlink control information including the PDSCH repetition number related information (eg, a repetition number). Can be received (S1903).
  • DCI downlink control information
  • the PDSCH repetition number related information eg, a repetition number
  • the PDSCH repetition number related information may exist when the first information is set.
  • the processor 2121 may repeatedly receive the PDSCH from the base station based on the second information and the DCI through the RF unit 2123 (S1904).
  • the UE may check the TTI for downlink transmission through the second information, check the PDSCH repetition number through the DCI, and repeatedly receive the PDSCH.
  • the processor 2121 may determine a time duration of the one or more TTIs. It may be determined whether the PDSCH is repeatedly received based on the operation (S1905). For example, the UE may determine whether the duration of the one or more TTIs is greater than or equal to a preset specific time and determine whether to continue repeated PDSCH reception after the one or more TTIs.
  • TTIs Transmission Time Intervals
  • each of the one or more TTIs may be a subslot, a slot, a subframe, a special subframe, or a part (eg, UpPTS) of the special subframe.
  • the UE may assume a special subframe as a subframe for uplink transmission, and calculate a duration by reporting one or more TTIs consisting of a continuous subframe and the special subframe as TTIs for uplink transmission. .
  • the UE may assume that the TTI for uplink transmission according to the length of the UpPTS and / or DwPTS.
  • the processor 2121 stops repeat reception of the PDSCH, and if the duration of the one or more TTIs is less than or equal to a specific time, After the TTIs, the PDSCH may be controlled to be repeatedly received.
  • the UE may repeatedly receive the PDSCH in the TTI for the next downlink transmission without expecting the PDSCH repeated reception in one or more TTIs for the uplink transmission.
  • the specific time may be a preset time to satisfy the latency requirement.
  • the UE receives the PDSCH repetition number related information indicating four repetitions, and includes the TTI starting the repetitive reception through the second information (first TTI) so that seven consecutive TTIs are ⁇ D, D, D , S, U, D, D ⁇ .
  • the UE may repeatedly receive the PDSCH in TTIs for three consecutive downlink transmissions.
  • the terminal may confirm that there is one or more consecutive TTIs (S, U) for uplink transmission, and may verify the duration of the one or more consecutive TTIs (S, U). If the duration of the corresponding TTIs (S, U) is more than a preset specific time (for example, 1ms), the UE may stop the repeated PDSCH reception.
  • a preset specific time for example, 1ms
  • the UE may receive the remaining one PDSCH in the TTI (D) for the next downlink transmission.
  • S is assumed to be a subframe for uplink transmission, it may be assumed as a subframe for downlink transmission by the terminal.
  • the terminal checks the duration of the one or more TTIs, and It may be determined whether to repeatedly receive the PDSCH before the one or more TTIs or continue repeating the reception after the one or more TTIs, and may start to repeat the PDSCH.
  • the UE stops repeating the reception of the PDSCH and continues the PDSCH if it is shorter than the length of the subframe. Can be repeatedly received.
  • the present invention can improve latency performance in PDSCH repetition operation.
  • the present invention has been described based on downlink repetitive reception (PDSCH repetitive reception) in the above-described example, the present invention is not limited to downlink repetitive reception, and may be implemented through a terminal and / or a base station through uplink repetitive reception.
  • PDSCH repetitive reception downlink repetitive reception
  • 20 is a flowchart illustrating a method of operating a base station proposed in the present specification.
  • a base station may transmit a higher layer signal including first information on setting of a PDSCH repetition related operation to a terminal (S2001).
  • the PDSCH repetition related operation may be a HARQ-less / blind (or HARQ-less and / or blind) PDSCH repetition operation.
  • the first information may be upper layer parameters blindSlotSubslotPDSCH-Repetitions and / or blindSubframePDSCH-Repetitions.
  • the base station may transmit second information related to uplink-downlink configuration (UL-DL configuration) to the terminal (S2002).
  • UL-DL configuration uplink-downlink configuration
  • the terminal may confirm that the radio frame includes TTIs of ⁇ D, D, D, S, U, D, D ⁇ through the second information.
  • U denotes a subframe for uplink (UL) transmission
  • S denotes a special subframe
  • D denotes a subframe for downlink (DL) transmission.
  • the TTI has been described as having a subframe length, but is not limited thereto. The TTI may be set and / or defined in various lengths.
  • the second information may be included in the higher layer signal or a physical downlink control channel (PDCCH).
  • PDCH physical downlink control channel
  • the second information may be uplink-downlink configuration information.
  • the second information may be an upper layer parameter subframeAssignment.
  • the second information when the second information is included in the physical downlink control channel, the second information may be change related information of uplink-downlink configuration.
  • the PDCCH including the second information may be a PDCCH scrambled by CRC by Enhanced Interference Mitigation and Traffic Adaptation (eIMTA) -Radio Network Temporary Identifier (RNTI).
  • the terminal may receive information (eg, higher layer parameter EIMTA-MainConfigServCell-r12) regarding the configuration of the eIMTA operation before receiving the second information. That is, when the terminal is set to the upper layer parameter EIMTA-MainConfigServCell-r12, the terminal may receive (and / or monitor and decode) the PDCCH scrambled by the eIMTA-RNTI including the second information.
  • the UE may receive uplink-downlink configuration information (eg, higher layer parameter subframeAssignment) before receiving the second information included in the PDCCH.
  • uplink-downlink configuration information eg, higher layer parameter subframeAssignment
  • the terminal receiving the uplink-downlink configuration information may then receive the second information and perform PDSCH repetitive reception based on the uplink-downlink configuration changed by the second information.
  • the base station may transmit downlink control information (DCI) including the PDSCH repetition number related information (eg, a repetition number) to the terminal based on the first information (S2003).
  • DCI downlink control information
  • the PDSCH repetition number related information eg, a repetition number
  • the PDSCH repetition number related information may exist when the first information is set.
  • the base station may repeatedly transmit the PDSCH to the terminal (S2004).
  • the UE may check the TTI for downlink transmission through the second information, check the PDSCH repetition number through the DCI, and repeatedly receive the PDSCH.
  • the base station determines whether to repeatedly transmit the PDSCH based on a time duration of the one or more TTIs. Can be determined (S2005). For example, the base station may determine whether the duration of the one or more TTIs is greater than or equal to a preset specific time and determine whether to continue PDSCH repeated transmission after the one or more TTIs.
  • TTIs transmission time intervals
  • each of the one or more TTIs may be a subslot, a slot, a subframe, a special subframe, or a part (eg, UpPTS) of the special subframe.
  • the base station may assume a special subframe as a subframe for uplink transmission, and calculate a duration by looking at one or more TTIs consisting of a continuous subframe and the special subframe as TTIs for uplink transmission. .
  • the base station may assume the TTI for uplink transmission according to the length of the UpPTS and / or DwPTS.
  • the base station stops repetitive transmission of the PDSCH when the duration of the one or more TTIs is more than a certain time, and continuously repeats transmission of the PDSCH after the one or more TTIs when the duration of the one or more TTIs is less than a specific time. Can be.
  • the specific time may be a preset time to satisfy the latency requirement.
  • the base station may repeatedly transmit the PDSCH four times.
  • the base station may include the TTI starting the repetitive transmission (first TTI) to confirm that seven consecutive TTIs are ⁇ D, D, D, S, U, D, D ⁇ .
  • the base station may repeatedly transmit the PDSCH in TTIs for three consecutive downlink transmissions.
  • the base station can confirm that there are one or more consecutive TTIs (S, U) for uplink transmission and can confirm the duration of the one or more consecutive TTIs (S, U).
  • the base station may stop the PDSCH repetitive transmission when the duration of the corresponding TTIs (S, U) is more than a preset specific time (for example, 1 ms).
  • the base station may transmit the remaining one PDSCH in the TTI (D) for the next downlink transmission.
  • S is assumed to be a subframe for uplink transmission, but may also be assumed to be a subframe for downlink transmission by the base station.
  • the base station verifies the duration of the one or more TTIs, and checks the PDSCH before the one or more TTIs. It may be determined whether to repeatedly transmit or continue repeated transmission after one or more TTIs, and may start PDSCH repeated transmission.
  • the base station stops PDSCH repetitive transmission if the length of the TTI included in one or more TTIs for uplink transmission is equal to or longer than the length of the subframe, and continues the PDSCH if it is shorter than the length of the subframe. Can be repeated.
  • the present invention can improve latency performance in PDSCH repetition operation.
  • uplink repetitive transmission and reception may be implemented by the terminal and / or the base station.
  • the above-described operation of the base station may be specifically implemented by the base station apparatus 2110 shown in FIG. 21 of the present specification.
  • the above-described operation of the base station may be performed by the processor 2111 and / or the RF unit 2113.
  • the processor 2111 may transmit a higher layer signal including first information about a setting of a PDSCH repetition related operation to the terminal through the RF unit 2113 (S2001).
  • the PDSCH repetition related operation may be a HARQ-less / blind (or HARQ-less and / or blind) PDSCH repetition operation.
  • the first information may be upper layer parameters blindSlotSubslotPDSCH-Repetitions and / or blindSubframePDSCH-Repetitions.
  • the processor 2111 may transmit second information related to uplink-downlink configuration (UL-DL configuration) to the terminal through the RF unit 2113 (S2002).
  • UL-DL configuration uplink-downlink configuration
  • the terminal may confirm that the radio frame includes TTIs of ⁇ D, D, D, S, U, D, D ⁇ through the second information.
  • U denotes a subframe for uplink (UL) transmission
  • S denotes a special subframe
  • D denotes a subframe for downlink (DL) transmission.
  • the TTI has been described as having a subframe length, but is not limited thereto. The TTI may be set and / or defined in various lengths.
  • the second information may be included in the higher layer signal or a physical downlink control channel (PDCCH).
  • PDCH physical downlink control channel
  • the second information may be uplink-downlink configuration information.
  • the second information may be an upper layer parameter subframeAssignment.
  • the second information when the second information is included in the physical downlink control channel, the second information may be change related information of uplink-downlink configuration.
  • the PDCCH including the second information may be a PDCCH scrambled by CRC by Enhanced Interference Mitigation and Traffic Adaptation (eIMTA) -Radio Network Temporary Identifier (RNTI).
  • the terminal may receive information (eg, higher layer parameter EIMTA-MainConfigServCell-r12) regarding the configuration of the eIMTA operation before receiving the second information. That is, when the terminal is set to the upper layer parameter EIMTA-MainConfigServCell-r12, the terminal may receive (and / or monitor and decode) the PDCCH scrambled by the eIMTA-RNTI including the second information.
  • the UE may receive uplink-downlink configuration information (eg, higher layer parameter subframeAssignment) before receiving the second information included in the PDCCH.
  • uplink-downlink configuration information eg, higher layer parameter subframeAssignment
  • the terminal receiving the uplink-downlink configuration information may then receive the second information and perform PDSCH repetitive reception based on the uplink-downlink configuration changed by the second information.
  • the processor 2111 transmits downlink control information (DCI) including downlink control information (eg, repetition number) to the terminal through the RF unit 2113 based on the first information. Can be transmitted (S2003).
  • DCI downlink control information
  • S2003 downlink control information
  • the PDSCH repetition number related information may exist when the first information is set.
  • the processor 2111 may repeatedly transmit the PDSCH to the terminal through the RF unit 2113 (S2004).
  • the UE may check the TTI for downlink transmission through the second information, check the PDSCH repetition number through the DCI, and repeatedly receive the PDSCH.
  • the base station determines whether to repeatedly transmit the PDSCH based on a time duration of the one or more TTIs. Can be determined (S2005). For example, the base station may determine whether the duration of the one or more TTIs is greater than or equal to a preset specific time and determine whether to continue PDSCH repeated transmission after the one or more TTIs.
  • TTIs transmission time intervals
  • each of the one or more TTIs may be a subslot, a slot, a subframe, a special subframe, or a part (eg, UpPTS) of the special subframe.
  • the base station may assume a special subframe as a subframe for uplink transmission, and calculate a duration by looking at one or more TTIs consisting of a continuous subframe and the special subframe as TTIs for uplink transmission. .
  • the base station may assume the TTI for uplink transmission according to the length of the UpPTS and / or DwPTS.
  • the processor 2111 stops repetitive transmission of the PDSCH when the duration of the one or more TTIs is greater than or equal to a specific time through the RF unit 2113, and when the duration of the one or more TTIs is less than a specific time, After the TTIs, the PDSCH may be continuously transmitted repeatedly.
  • the specific time may be a preset time to satisfy the latency requirement.
  • the base station may repeatedly transmit the PDSCH four times.
  • the base station may include the TTI starting the repetitive transmission (first TTI) to confirm that seven consecutive TTIs are ⁇ D, D, D, S, U, D, D ⁇ .
  • the base station may repeatedly transmit the PDSCH in TTIs for three consecutive downlink transmissions.
  • the base station can confirm that there are one or more consecutive TTIs (S, U) for uplink transmission and can confirm the duration of the one or more consecutive TTIs (S, U).
  • the base station may stop the PDSCH repetitive transmission when the duration of the corresponding TTIs (S, U) is more than a preset specific time (for example, 1 ms).
  • the base station may transmit the remaining one PDSCH in the TTI (D) for the next downlink transmission.
  • S is assumed to be a subframe for uplink transmission, but may also be assumed to be a subframe for downlink transmission by the base station.
  • the base station verifies the duration of the one or more TTIs, and checks the PDSCH before the one or more TTIs. It may be determined whether to repeatedly transmit or continue repeated transmission after one or more TTIs, and may start PDSCH repeated transmission.
  • the base station stops PDSCH repetitive transmission if the length of the TTI included in one or more TTIs for uplink transmission is equal to or longer than the length of the subframe, and continues the PDSCH if it is shorter than the length of the subframe. Can be repeated.
  • the present invention can improve latency performance in PDSCH repetition operation.
  • uplink repetitive transmission and reception may be implemented by the terminal and / or the base station.
  • FIG. 21 shows an example of an internal block diagram of a wireless communication device to which the present invention can be applied.
  • a wireless communication system includes a base station 2110 and a plurality of terminals 2120 located in an area of a base station 2110.
  • the base station 2110 includes a processor 2111, a memory 2112, and an RF unit 2113.
  • the processor 2111 implements the functions, processes, and / or methods proposed in FIGS. 1 to 20. Layers of the air interface protocol may be implemented by the processor 2111.
  • the memory 2112 is connected to the processor 2111 and stores various information for driving the processor 2111.
  • the RF unit 2113 is connected to the processor 2111 to transmit and / or receive a radio signal.
  • the terminal 2120 includes a processor 2121, a memory 2122, and an RF unit 2123.
  • the processor 2121 implements the functions, processes, and / or methods proposed in FIGS. 1 to 20. Layers of the air interface protocol may be implemented by the processor 2121.
  • the memory 2122 is connected to the processor 2121 and stores various information for driving the processor 2121.
  • the RF unit 2123 is connected to the processor 2121 and transmits and / or receives a radio signal.
  • the memories 2112 and 2122 may be inside or outside the processors 2111 and 2121, and may be connected to the processors 2111 and 2121 by various well-known means.
  • the memories 2112 and 2122 may store a program for processing and controlling the processors 2111 and 2121, and may temporarily store input / output information.
  • the memories 2112 and 2122 may be utilized as buffers.
  • the base station 2110 and / or the terminal 2120 may have a single antenna or multiple antennas.
  • 22 is a block diagram illustrating a communication device according to one embodiment of the present invention.
  • FIG. 22 is a diagram illustrating the terminal of FIG. 21 in more detail.
  • a terminal may include a processor (or a digital signal processor (DSP) 2210, an RF module (or RF unit) 2235, and a power management module 2205). ), Antenna 2240, battery 2255, display 2215, keypad 2220, memory 2230, SIM card Subscriber Identification Module card) 2225 (this configuration is optional), a speaker 2245 and a microphone 2250.
  • the terminal may also include a single antenna or multiple antennas. Can be.
  • the processor 2210 implements the functions, processes, and / or methods proposed in FIGS. 1 to 21.
  • the layer of the air interface protocol may be implemented by the processor 2210.
  • the memory 2230 is connected to the processor 2210 and stores information related to the operation of the processor 2210.
  • the memory 2230 may be inside or outside the processor 2210 and may be connected to the processor 2210 by various well-known means.
  • the user enters command information, such as a telephone number, for example by pressing (or touching) a button on keypad 2220 or by voice activation using microphone 2250.
  • the processor 2210 receives the command information, processes the telephone number, and performs a proper function. Operational data may be extracted from the SIM card 2225 or the memory 2230. In addition, the processor 2210 may display command information or driving information on the display 2215 for the user's knowledge and convenience.
  • the RF module 2235 is connected to the processor 2210 to transmit and / or receive an RF signal.
  • the processor 2210 passes command information to the RF module 2235 to transmit, for example, a radio signal constituting voice communication data to initiate communication.
  • the RF module 2235 is composed of a receiver and a transmitter for receiving and transmitting a radio signal.
  • the antenna 2240 functions to transmit and receive a radio signal.
  • the RF module 2235 may forward the signal and convert the signal to baseband for processing by the processor 2210.
  • the processed signal may be converted into audible or readable information output through the speaker 2245.
  • FIG. 23 is a diagram illustrating an example of an RF module of a wireless communication device to which a method proposed in this specification can be applied.
  • FIG. 23 illustrates an example of an RF module that may be implemented in a frequency division duplex (FDD) system.
  • FDD frequency division duplex
  • the processor described in FIGS. 21 and 22 processes the data to be transmitted and provides an analog output signal to the transmitter 2310.
  • the analog output signal is filtered by a low pass filter (LPF) 2311 to remove images caused by digital-to-analog conversion (ADC), and an upconverter ( Up-converted from baseband to RF by Mixer, 2312, and amplified by Variable Gain Amplifier (VGA) 2313, the amplified signal is filtered by filter 2314 and powered amplifier Further amplified by Amplifier (PA) 2315, routed through duplexer (s) 2350 / antenna switch (s) 2360, and transmitted via antenna 2370.
  • LPF low pass filter
  • ADC analog-to-analog conversion
  • VGA Variable Gain Amplifier
  • the antenna receives signals from the outside and provides the received signals, which are routed through the antenna switch (s) 2360 / duplexers 2350 and provided to the receiver 2320. .
  • the received signals are amplified by a Low Noise Amplifier (LNA) 2323, filtered by a bandpass filter 2324, and received from RF by a down converter (Mixer, 2325). Downconvert to baseband.
  • LNA Low Noise Amplifier
  • the down-converted signal is filtered by low pass filter (LPF) 2326 and amplified by VGA 2327 to obtain an analog input signal, which is provided to the processor described in FIGS. 21 and 22.
  • LPF low pass filter
  • a local oscillator (LO) generator 2340 provides transmit and receive LO signals to the generate and up converter 2312 and down converter 2325, respectively.
  • LO local oscillator
  • Phase Locked Loop (PLL) 2330 also receives control information from the processor to generate transmit and receive LO signals at appropriate frequencies and provides control signals to LO generator 2340.
  • circuits shown in FIG. 23 may be arranged differently from the configuration shown in FIG. 23.
  • FIG. 24 is a diagram illustrating still another example of an RF module of a wireless communication device to which a method proposed in this specification can be applied.
  • FIG. 24 illustrates an example of an RF module that may be implemented in a time division duplex (TDD) system.
  • TDD time division duplex
  • the transmitter 2410 and receiver 2420 of the RF module in the TDD system are identical to the structure of the transmitter and receiver of the RF module in the FDD system.
  • the RF module of the TDD system will be described only for the structure that differs from the RF module of the FDD system, and the description of the same structure will be described with reference to FIG. 23.
  • the signal amplified by the transmitter's power amplifier (PA) 2415 is routed through a band select switch (2450), a band pass filter (BPF) 2460, and antenna switch (s) 2470. And is transmitted through the antenna 2480.
  • PA power amplifier
  • BPF band pass filter
  • s antenna switch
  • the antenna receives signals from the outside and provides the received signals, which are routed through the antenna switch (s) 2470, the band pass filter 2460 and the band select switch 2450. To the receiver 2420.
  • 25 is a diagram illustrating an example of a signal processing module to which the methods proposed in the specification can be applied.
  • 25 illustrates an example of a signal processing module structure in a transmission device.
  • the terminal or the base station of FIG. 21 may be referred to as a transmitting device or a receiving device.
  • signal processing may be performed in a processor of a base station / terminal such as the processors 2111 and 2121 of FIG. 21.
  • a transmission device in a terminal 2120 or a base station 2121 may include a scrambler 2501, a modulator 2502, a layer mapper 2503, an antenna port mapper 2504, a resource block mapper 2505, and a signal.
  • Generator 2506 may be included.
  • the transmitting device may transmit one or more codewords. Coded bits in each codeword are scrambled by the scrambler 2501 and transmitted on the physical channel.
  • the codeword may be referred to as a data string and may be equivalent to a transport block which is a data block provided by the MAC layer.
  • the scrambled bits are modulated into complex-valued modulation symbols by modulator 2502.
  • the modulator 2502 modulates the scrambled bits according to a modulation scheme and arranges the scrambled bits as complex modulation symbols representing positions on a signal constellation.
  • m-PSK m-Phase Shift Keying
  • m-QAM m-Quadrature Amplitude Modulation
  • the modulator may be referred to as a modulation mapper.
  • the complex modulation symbol may be mapped to one or more transport layers by layer mapper 2503. Complex modulation symbols on each layer may be mapped by antenna port mapper 2504 for transmission on the antenna port.
  • the resource block mapper 2505 may map the complex modulation symbol for each antenna port to an appropriate resource element in a virtual resource block allocated for transmission.
  • the resource block mapper may map the virtual resource block to a physical resource block according to an appropriate mapping scheme.
  • the resource block mapper 2505 may allocate a complex modulation symbol for each antenna port to an appropriate subcarrier and multiplex it according to a user.
  • the signal generator 2506 modulates a complex modulation symbol for each antenna port, that is, an antenna specific symbol by a specific modulation scheme, for example, an Orthogonal Frequency Division Multiplexing (OFDM) scheme, thereby complex-valued time domain.
  • An OFDM symbol signal can be generated.
  • the signal generator may perform an inverse fast fourier transform (IFFT) on an antenna specific symbol, and a cyclic prefix (CP) may be inserted into a time domain symbol on which the IFFT is performed.
  • IFFT inverse fast fourier transform
  • CP cyclic prefix
  • the OFDM symbol is transmitted to the receiving apparatus through each transmit antenna through digital-to-analog conversion, frequency upconversion, and the like.
  • the signal generator may include an IFFT module and a CP inserter, a digital-to-analog converter (DAC), a frequency uplink converter, and the like.
  • FIG. 26 is a diagram illustrating another example of a signal processing module to which the methods proposed herein may be applied.
  • FIG. 26 is a diagram illustrating another example of a signal processing module to which the methods proposed herein may be applied.
  • 26 illustrates another example of a signal processing module structure in a base station or a terminal.
  • the signal processing may be performed in a processor of the terminal / base station such as the processors 2111 and 2120 of FIG. 21.
  • a signal processing module for signal transmission includes a scrambler 2601, a modulator 2602, a layer mapper 2603, a precoder 2604, a resource block mapper 2605, and a signal generator 2606. can do.
  • the transmitting device may scramble the coded bits in the codeword by the scrambler 2601 for one codeword and then transmit the same through a physical channel.
  • the scrambled bit is modulated into a complex modulation symbol by modulator 2602.
  • the modulator may be arranged as a complex modulation symbol representing a position on a signal constellation by modulating the scrambled bit according to a predetermined modulation scheme.
  • the modulation scheme is not limited, and pi / 2-Binary Phase Shift Keying (pi / 2-BPSK), m-Phase Shift Keying (m-PSK), or m-Quadrature Amplitude Modulation (m-QAM) It can be used for modulation of the encoded data.
  • the complex modulation symbol may be mapped to one or more transport layers by the layer mapper 2603.
  • Complex modulation symbols on each layer may be precoded by the precoder 2604 for transmission on the antenna port.
  • the precoder may perform precoding after performing transform precoding on the complex modulation symbol.
  • the precoder may perform precoding without performing transform precoding.
  • the precoder 2604 may process the complex modulation symbol in a MIMO scheme according to a multiple transmit antenna to output antenna specific symbols and distribute the antenna specific symbols to the corresponding resource block mapper 2605.
  • the output z of the precoder 2604 can be obtained by multiplying the output y of the layer mapper 2603 by the precoding matrix W of N ⁇ M. Where N is the number of antenna ports and M is the number of layers.
  • the resource block mapper 2605 maps the demodulation modulation symbol for each antenna port to the appropriate resource element in the virtual resource block allocated for transmission.
  • the resource block mapper 2605 may assign a complex modulation symbol to an appropriate subcarrier and multiplex it according to a user.
  • the signal generator 2606 may generate a complex-valued time domain (OFDM) orthogonal frequency division multiplexing (OFDM) symbol signal by modulating the complex modulation symbol in a specific modulation scheme, for example, the OFDM scheme.
  • the signal generator 2606 may perform an inverse fast fourier transform (IFFT) on an antenna specific symbol, and a cyclic prefix (CP) may be inserted into a time domain symbol on which the IFFT is performed.
  • IFFT inverse fast fourier transform
  • CP cyclic prefix
  • the OFDM symbol is transmitted to the receiving apparatus through each transmit antenna through digital-to-analog conversion, frequency upconversion, and the like.
  • the signal generator 2606 may include an IFFT module and a CP inserter, a digital-to-analog converter (DAC), a frequency uplink converter, and the like.
  • the signal processing of the receiver may be configured as the inverse of the signal processing of the transmitter.
  • the processor 2110 or 2120 of the receiving apparatus performs decoding and demodulation on the radio signal received through the antenna port (s) of the RF units 2113 and 2123 from the outside.
  • the receiving device may include a plurality of multiple receiving antennas, and each of the signals received through the receiving antenna is restored to the baseband signal and then restored to the data sequence originally intended to be transmitted by the transmission device through multiplexing and MIMO demodulation. .
  • the receiver may include a signal recoverer for recovering the received signal into a baseband signal, a multiplexer for combining and multiplexing the received processed signals, and a channel demodulator for demodulating the multiplexed signal sequence with a corresponding codeword.
  • the signal reconstructor, multiplexer, and channel demodulator may be configured as one integrated module or each independent module for performing their functions. More specifically, the signal reconstructor is an analog-to-digital converter (ADC) for converting an analog signal into a digital signal, a CP remover for removing a CP from the digital signal, and a fast fourier transform (FFT) to the signal from which the CP is removed.
  • ADC analog-to-digital converter
  • FFT fast fourier transform
  • FFT module for outputting a frequency domain symbol by applying a, and may include a resource element demapper (equalizer) to restore the frequency domain symbol to an antenna-specific symbol (equalizer).
  • the antenna specific symbol is restored to a transmission layer by a multiplexer, and the transmission layer is restored to a codeword intended to be transmitted by a transmitting device by a channel demodulator.
  • the wireless device includes a base station, a network node, a transmitting terminal, a receiving terminal, a wireless device, a wireless communication device, a vehicle, a vehicle equipped with an autonomous driving function, an unmanned aerial vehicle (UAV), an artificial intelligence (AI) module, Robots, Augmented Reality (AR) devices, Virtual Reality (VR) devices, MTC devices, IoT devices, medical devices, fintech devices (or financial devices), security devices, climate / environmental devices, or other areas of the fourth industrial revolution, or It may be a device related to the 5G service.
  • a drone may be a vehicle in which humans fly by radio control signals.
  • the MTC device and the IoT device are devices that do not require human intervention or manipulation, and may be smart meters, bending machines, thermometers, smart bulbs, door locks, various sensors, and the like.
  • a medical device is a device used to examine, replace, or modify a device, structure, or function used for diagnosing, treating, alleviating, treating, or preventing a disease, such as a medical device, a surgical device, ( In vitro) diagnostic devices, hearing aids, surgical devices, and the like.
  • the security device is a device installed to prevent a risk that may occur and maintain safety, and may be a camera, a CCTV, a black box, or the like.
  • the fintech device is a device that can provide financial services such as mobile payment, and may be a payment device or a point of sales (POS).
  • the climate / environmental device may mean a device for monitoring and predicting the climate / environment.
  • the terminal is a mobile phone, a smart phone, a laptop computer, a digital broadcasting terminal, a personal digital assistant (PDA), a portable multimedia player (PMP), navigation, a slate PC, a tablet PC. (tablet PC), ultrabook, wearable device (e.g. smartwatch, glass glass, head mounted display), foldable device And the like.
  • the HMD is a display device of a type worn on the head and may be used to implement VR or AR.
  • Embodiments according to the present invention may be implemented by various means, for example, hardware, firmware, software, or a combination thereof.
  • an embodiment of the present invention may include one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), and FPGAs ( field programmable gate arrays), processors, controllers, microcontrollers, microprocessors, and the like.
  • ASICs application specific integrated circuits
  • DSPs digital signal processors
  • DSPDs digital signal processing devices
  • PLDs programmable logic devices
  • FPGAs field programmable gate arrays
  • an embodiment of the present invention may be implemented in the form of a module, procedure, function, etc. that performs the functions or operations described above.
  • the software code may be stored in memory and driven by the processor.
  • the memory may be located inside or outside the processor, and may exchange data with the processor by various known means.
  • the method for transmitting and receiving downlink data in the wireless communication system of the present specification has been described with reference to an example applied to the 3GPP LTE / LTE-A system, but is applied to various wireless communication systems such as 5G system in addition to the 3GPP LTE / LTE-A system. It is possible to do

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Abstract

La présente invention concerne un procédé de transmission et de réception d'un canal physique partagé de liaison descendante (PDSCH) dans un système de communication sans fil, ainsi qu'un dispositif conçu pour prendre en charge ledit procédé. Le procédé mis en œuvre par un terminal peut en particulier comprendre les étapes consistant à : recevoir d'une station de base un signal de niveau supérieur contenant des premières informations relatives à une configuration d'une opération associée à la répétition du PDSCH ; recevoir de la station de base des secondes informations relatives à une configuration de liaison montante-liaison descendante ; sur la base des premières informations, recevoir de la station de base des informations de commande de liaison descendante (DCI) contenant des informations relatives au nombre de répétitions du PDSCH ; sur la base des secondes informations et des DCI, recevoir répétitivement le PDSCH provenant de la station de base ; et déterminer s'il faut continuer à recevoir répétitivement le PDSCH sur la base de la durée d'au moins une unité de temps de transmission, si ladite au moins une unité de temps de transmission permettant une transmission en liaison montante existe pendant la réception répétée du PDSCH.
PCT/KR2019/095007 2018-05-09 2019-05-09 Procédé de transmission et de réception d'un canal physique partagé de liaison descendante dans un système de communication sans fil et dispositif conçu pour prendre en charge ledit procédé WO2019216745A1 (fr)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115333703A (zh) * 2021-05-11 2022-11-11 维沃移动通信有限公司 Pusch重复传输方法和设备

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090249153A1 (en) * 2008-03-24 2009-10-01 Wenfeng Zhang Dynamic adjustment and signaling of downlink/uplink allocation ratio in lte/tdd systems
US20130195041A1 (en) * 2012-01-26 2013-08-01 Samsung Electronics Co. Ltd. Method and apparatus for scheduling communication for low capability devices
US20160165579A1 (en) * 2013-07-26 2016-06-09 Lg Electronics Inc. Transmission/reception method for mtc apparatus

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090249153A1 (en) * 2008-03-24 2009-10-01 Wenfeng Zhang Dynamic adjustment and signaling of downlink/uplink allocation ratio in lte/tdd systems
US20130195041A1 (en) * 2012-01-26 2013-08-01 Samsung Electronics Co. Ltd. Method and apparatus for scheduling communication for low capability devices
US20160165579A1 (en) * 2013-07-26 2016-06-09 Lg Electronics Inc. Transmission/reception method for mtc apparatus

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
SAMSUNG: "Discussion on blind/HARQ-less PDSCH repetition for URLLC", RL-1804341, 3GPP TSG RAN WG1 MEETING #92BIS, 7 April 2018 (2018-04-07), Sanya, China, XP051413893 *
ZTE: "Discussion on PDSCH repetition for LTE URLLC", RL-1803962, 3GPP TSG RAN WG1 MEETING #92BIS, 6 April 2018 (2018-04-06), Sanya, China, XP051413054 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115333703A (zh) * 2021-05-11 2022-11-11 维沃移动通信有限公司 Pusch重复传输方法和设备

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