WO2020032521A1 - Procédé d'émission ou de réception de signal dans un système de communication sans fil et appareil prenant en charge ce procédé - Google Patents

Procédé d'émission ou de réception de signal dans un système de communication sans fil et appareil prenant en charge ce procédé Download PDF

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Publication number
WO2020032521A1
WO2020032521A1 PCT/KR2019/009766 KR2019009766W WO2020032521A1 WO 2020032521 A1 WO2020032521 A1 WO 2020032521A1 KR 2019009766 W KR2019009766 W KR 2019009766W WO 2020032521 A1 WO2020032521 A1 WO 2020032521A1
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symbol
dmrs
pusch
mapping type
index
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PCT/KR2019/009766
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English (en)
Korean (ko)
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양석철
박한준
김선욱
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엘지전자 주식회사
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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
    • H04W72/12—Wireless traffic scheduling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA

Definitions

  • the present invention relates to a method and apparatus for use in a wireless communication system, and to a method and apparatus for supporting a signal in a wireless communication system supporting an unlicensed band.
  • next-generation communication As more communication devices demand greater communication capacity, there is a need for enhanced mobile broadband (eMBB) communication as compared to conventional radio access technology (RAT).
  • eMBB enhanced mobile broadband
  • mMTC massive machine type communications
  • mMTC massive machine type communications
  • a communication system design considering a service / UE that is sensitive to reliability and latency is being discussed.
  • next-generation RAT considering eMBB communication, mMTC, ultra-reliable and low latency communication (URLLC), and the like are discussed, and for convenience, the technology is referred to as NR.
  • An object of the present invention is to provide a method for transmitting and receiving signals in a wireless communication system supporting an unlicensed band and an apparatus supporting the same.
  • the present invention provides a method for transmitting and receiving signals in a wireless communication system supporting an unlicensed band and an apparatus supporting the same.
  • a communication method by an apparatus in a wireless communication system receiving uplink scheduling information on a physical uplink shared channel (PUSCH), CAP (target) for the candidate start symbol for the PUSCH transmission; performing a channel access procedure, and starting transmission of the PUSCH in a symbol having succeeded in the CAP, wherein the uplink scheduling information on the PUSCH includes a PUSCH transmission start symbol and a demodulation reference signal (DMRS) mapping type.
  • a candidate start symbol is determined as one or more symbols based on a relative positional relationship between the PUSCH transmission start symbol and a symbol to which a DMRS is mapped.
  • a communication apparatus used in a wireless communication system comprising a memory and a processor, the processor receives uplink scheduling information about a physical uplink shared channel (PUSCH) and performs the PUSCH transmission.
  • PUSCH physical uplink shared channel
  • a CAP channel access procedure
  • the transmission of the PUSCH is started from a symbol having succeeded in the CAP
  • the uplink scheduling information on the PUSCH is a PUSCH transmission start symbol and a DMRS
  • a candidate start symbol is determined as one or more symbols based on a relative positional relationship between the PUSCH transmission start symbol and a symbol to which a DMRS is mapped according to the DMRS mapping type.
  • the candidate start symbol is determined as one or more symbols according to the position of the PUSCH transmission start symbol, and if the DMRS mapping type is the second mapping type, the candidate start symbol May be fixed to one symbol to which the first symbol of the DMRS is mapped.
  • the first mapping type is fixed to a specific symbol index N to indicate a DMRS mapping type to which the first symbol of the DMRS is mapped, wherein N is 2 or 3, and the second mapping type is the PUSCH transmission start symbol.
  • N is 2 or 3
  • the second mapping type is the PUSCH transmission start symbol.
  • a DMRS mapping type to which the first symbol of the DMRS is mapped based on the position of may be indicated.
  • the candidate start symbol when the DMRS mapping type is the first mapping type and the index M of the PUSCH transmission start symbol is smaller than the N, the candidate start symbol includes a symbol of a symbol index M to a symbol index N, and the DMRS When the mapping type is the first mapping type and M and N are the same, the candidate start symbol may be a symbol having a symbol index N.
  • the CAP is started before or after a specific time in the candidate start symbol, and the candidate start symbol is defined by the DMRS.
  • the CAP may be started before a specific time in the candidate start symbol.
  • the specific time may be determined in consideration of the minimum time required for channel sensing.
  • the device applied to the embodiment of the present invention may include an autonomous driving device.
  • the UE can efficiently perform uplink transmission in the unlicensed band.
  • the UE may efficiently perform LBT and uplink transmission without separately scheduling a plurality of uplink transmission start symbols considering the LBT.
  • FIG. 1 illustrates physical channels used in a 3GPP system, which is an example of a wireless communication system, and a general signal transmission method using the same.
  • SSB Synchronization Signal Block
  • 3 illustrates the structure of a radio frame.
  • FIG. 6 shows an example in which a physical channel is mapped into a self-contained slot.
  • PUSCH 7 illustrates a process of transmitting a physical uplink shared channel (PUSCH).
  • PUSCH physical uplink shared channel
  • FIG. 8 is a diagram illustrating a wireless communication system supporting an unlicensed band.
  • FIG. 9 is a flowchart illustrating a CAP for uplink signal transmission through an unlicensed band of a terminal.
  • FIG. 13 illustrates a communication system applied to the present invention.
  • FIG. 14 illustrates a wireless device that can be applied to the present invention.
  • 15 illustrates another example of a wireless device that can be applied to the present invention.
  • FIG. 16 illustrates a vehicle or autonomous vehicle that can be applied to the present invention.
  • 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
  • CDMA may be implemented by a radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA2000.
  • TDMA may be implemented with wireless technologies such as Global System for Mobile communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rates for GSM Evolution (EDGE).
  • 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), or the like.
  • UTRA is part of the Universal Mobile Telecommunications System (UMTS).
  • 3rd Generation Partnership Project (3GPP) long term evolution (LTE) is part of Evolved UMTS (E-UMTS) using E-UTRA and LTE-A (Advanced) is an evolved version of 3GPP LTE.
  • 3GPP NR New Radio or New Radio Access Technology
  • 3GPP LTE / LTE-A is an evolution of 3GPP LTE / LTE-A.
  • a terminal receives information through a downlink (DL) from a base station, and the terminal transmits information through an uplink (UL) to the base station.
  • the information transmitted and received between the base station and the terminal includes data and various control information, and various physical channels exist according to the type / use of the information transmitted and received.
  • 1 is a diagram for explaining physical channels and a general signal transmission method used in a 3GPP system.
  • an initial cell search operation such as synchronization with a base station is performed (S11).
  • the UE may receive a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS), and a Physical Broadcast Channel (PBCH) from a base station through a Synchronization Signal Block (SSB) block.
  • PSS Primary Synchronization Signal
  • SSS Secondary Synchronization Signal
  • PBCH Physical Broadcast Channel
  • the terminal receives the PSS and the SSS, synchronizes with the base station, and acquires information such as a cell identity.
  • the terminal may receive the PBCH from the base station to obtain broadcast information in the cell.
  • the UE may check the downlink channel state by receiving a DL RS (Downlink Reference Signal) in the initial cell search step.
  • DL RS Downlink Reference Signal
  • the UE may obtain more specific system information by receiving a physical downlink control channel (PDCCH) and a physical downlink control channel (PDSCH) corresponding thereto (S12).
  • PDCCH physical downlink control channel
  • PDSCH physical downlink control channel
  • the terminal may perform a random access procedure (S13 to S16) to complete the access to the base station.
  • the UE may transmit a preamble through a physical random access channel (PRACH) (S13), and may receive a random access response (RAR) for the preamble through a PDCCH and a PDSCH corresponding thereto (S14).
  • the UE may transmit a physical uplink shared channel (PUSCH) using scheduling information in the RAR (S15) and perform a contention resolution procedure such as a PDCCH and a PDSCH corresponding thereto (S16).
  • PRACH physical random access channel
  • RAR random access response
  • PUSCH physical uplink shared channel
  • the random access procedure may be performed in two steps.
  • the terminal may transmit message 1 to the base station and receive message 2 from the base station in response to the message 1.
  • message 1 is a form in which preamble (S13) / PUSCH transmission (S15) is combined
  • message 2 is a form in which RAR (S14) / collision resolution message (S16) is combined.
  • the UE may perform PDCCH / PDSCH reception (S17) and PUSCH / PUCCH (Physical Uplink Control Channel) transmission (S18) as a general uplink / downlink signal transmission procedure.
  • Control information transmitted from the terminal to the base station is referred to as uplink control information (UCI).
  • UCI includes Hybrid Automatic Repeat and reQuest Acknowledgment / Negative-ACK (HARQ ACK / NACK), Scheduling Request (SR), Channel State Information (CSI), and the like.
  • the CSI includes a Channel Quality Indicator (CQI), a Precoding Matrix Indicator (PMI), a Rank Indication (RI), and the like.
  • the UCI is generally transmitted through the PUCCH, but may be transmitted through the PUSCH when control information and data should be transmitted at the same time.
  • the UE may transmit the UCI aperiodically through the PUSCH according to the request / instruction of the network.
  • the UE may perform cell search, system information acquisition, beam alignment for initial access, DL measurement, etc. based on the SSB.
  • the SSB is mixed with a Synchronization Signal / Physical Broadcast Channel (SS / PBCH) block.
  • SS / PBCH Synchronization Signal / Physical Broadcast Channel
  • SSB is composed of PSS, SSS and PBCH.
  • the SSB is composed of four consecutive OFDM symbols, and PSS, PBCH, SSS / PBCH, and PBCH are transmitted for each OFDM symbol.
  • PSS and SSS consist of 1 OFDM symbol and 127 subcarriers, respectively, and PBCH consists of 3 OFDM symbols and 576 subcarriers.
  • Polar coding and quadrature phase shift keying (QPSK) are applied to the PBCH.
  • the PBCH consists of a data RE and a demodulation reference signal (DMRS) RE for each OFDM symbol.
  • DMRS demodulation reference signal
  • the cell search refers to a process of acquiring time / frequency synchronization of a cell and detecting a cell ID (eg, physical layer cell ID, PCID) of the cell.
  • PSS is used to detect a cell ID within a cell ID group
  • SSS is used to detect a cell ID group.
  • PBCH is used for SSB (time) index detection and half-frame detection.
  • the cell search process of the terminal can be summarized as shown in Table 1 below.
  • Types of signals Operations 1st step PSS SS / PBCH block (SSB) symbol timing acquisition-Cell ID detection within a cell ID group (3 hypothesis) 2nd step SSS Cell Id group detection (336 hypothesis) 3rd step PBCH DMRS SSB index and Half frame (HF) index (Slot and frame boundary detection) 4th step PBCH -Time information (80ms, System Frame Number (SFN), SSB index, HF) -Remaining Minimum System Information (RMSI) Control resource set (CORESET) / Search space configuration 5th step PDCCH and PDSCH -Cell access information-RACH configuration
  • SSB PBCH block
  • 3 is a diagram illustrating the structure of a radio frame.
  • uplink and downlink transmission are composed of frames.
  • One radio frame has a length of 10 ms and is defined as two 5 ms half-frames (HFs).
  • One half-frame is defined as five 1 ms subframes (SFs).
  • One subframe is divided into one or more slots, and the number of slots in the subframe depends on subcarrier spacing (SCS).
  • SCS subcarrier spacing
  • Each slot includes 12 or 14 OFDM (A) symbols according to a cyclic prefix (CP).
  • CP cyclic prefix
  • each slot contains 14 symbols.
  • the symbol may include an OFDM symbol (or CP-OFDM symbol), an SC-FDMA symbol (or DFT-s-OFDM symbol).
  • OFDM (A) numerology eg, SCS, CP length, etc.
  • a numerology eg, SCS, CP length, etc.
  • the (absolute time) section of a time resource eg, SF, slot, or TTI
  • a time unit TU
  • One slot includes a plurality of symbols in the time domain. For example, in general, one slot includes 14 symbols in case of CP, but one slot includes 12 symbols in case of extended CP.
  • the carrier includes a plurality of subcarriers in the frequency domain.
  • Resource block (RB) is defined as a plurality of consecutive subcarriers (eg, 12) in the frequency domain.
  • a bandwidth part (BWP) is defined as a plurality of consecutive (P) RBs in the frequency domain and may correspond to one numerology (eg, SCS, CP length, etc.).
  • the carrier may include up to N (eg 5) BWPs. Data communication is performed through an activated BWP, and only one BWP may be activated by one UE.
  • Each element in the resource grid is referred to as a resource element (RE), one complex symbol may be mapped.
  • RE resource element
  • FIG. 5 illustrates the structure of a self-contained slot.
  • a frame is characterized by a self-complete structure in which all of a DL control channel, DL or UL data, UL control channel, etc. may be included in one slot.
  • the first N symbols in a slot may be used to transmit a DL control channel (hereinafter DL control region), and the last M symbols in the slot may be used to transmit a UL control channel (hereinafter UL control region).
  • N and M are each an integer of 0 or more.
  • a resource region hereinafter, referred to as a data region
  • DL area (i) DL data area, (ii) DL control area + DL data area
  • UL region (i) UL data region, (ii) UL data region + UL control region
  • the PDCCH may be transmitted in the DL control region, and the PDSCH may be transmitted in the DL data region.
  • PUCCH may be transmitted in the UL control region, and PUSCH may be transmitted in the UL data region.
  • the GP provides a time gap in the process of the base station and the terminal switching from the transmission mode to the reception mode or from the reception mode to the transmission mode. Some symbols at the time of switching from DL to UL in the subframe may be set to GP.
  • PDCCH carries Downlink Control Information (DCI).
  • DCI Downlink Control Information
  • DL-SCH downlink shared channel
  • UL-SCH resource allocation information for uplink shared channel
  • PCH paging information for paging channel
  • It carries system information on the DL-SCH, resource allocation information for higher layer control messages such as random access response transmitted on the PDSCH, transmission power control command, activation / deactivation of configured scheduling (CS), and the like.
  • DCI includes a cyclic redundancy check (CRC), which is masked / scrambled with various identifiers (eg, Radio Network Temporary Identifier, RNTI) according to the owner of PDCCH or the intended use.
  • CRC cyclic redundancy check
  • the CRC is masked with a terminal identifier (eg, Cell-RNTI, C-RNTI). If the PDCCH is about paging, the CRC is masked with P-RNTI (P-RNTI). If the PDCCH is for system information (eg, System Information Block, SIB), the CRC is masked with a System Information RNTI (SI-RNTI). If the PDCCH is for a random access response, the CRC is masked with a Random Access-RNTI (RA-RNTI).
  • a terminal identifier eg, Cell-RNTI, C-RNTI
  • SIB System Information Block
  • SI-RNTI System Information RNTI
  • RA-RNTI Random Access-RNTI
  • the PDCCH is composed of 1, 2, 4, 8, 16 CCEs (Control Channel Elements) according to an aggregation level (AL).
  • CCE is a logical allocation unit used to provide a PDCCH of a predetermined code rate according to a radio channel state.
  • the CCE consists of six Resource Element Groups (REGs).
  • REG is defined by one OFDM symbol and one (P) RB.
  • the PDCCH is transmitted through a CORESET (Control Resource Set).
  • CORESET is defined as a REG set with a given pneumonology (eg SCS, CP length, etc.).
  • a plurality of CORESET for one terminal may be overlapped in the time / frequency domain.
  • CORESET may be set through system information (eg, Master Information Block, MIB) or UE-specific higher layer (eg, Radio Resource Control, RRC, layer) signaling.
  • system information eg, Master Information Block, MIB
  • UE-specific higher layer eg, Radio Resource Control, RRC, layer
  • RRC Radio Resource Control
  • the number of RBs and the number of OFDM symbols (maximum 3) constituting CORESET may be set by higher layer signaling.
  • the UE monitors PDCCH candidates.
  • the PDCCH candidate represents CCE (s) that the UE should monitor for PDCCH detection.
  • Each PDCCH candidate is defined as 1, 2, 4, 8, 16 CCEs according to AL.
  • Monitoring includes (blind) decoding PDCCH candidates.
  • the set of PDCCH candidates monitored by the UE is defined as a PDCCH search space (SS).
  • the search space includes a common search space (CSS) or a UE-specific search space (USS).
  • the UE may acquire the DCI by monitoring the PDCCH candidate in one or more search spaces set by MIB or higher layer signaling.
  • Each CORESET is associated with one or more search spaces, and each search space is associated with one COREST.
  • the search space can be defined based on the following parameters.
  • controlResourceSetId indicates a CORESET associated with the search space
  • monitoringSlotPeriodicityAndOffset indicates the PDCCH monitoring interval (slot unit) and PDCCH monitoring interval offset (slot unit).
  • monitoringSymbolsWithinSlot represents the PDCCH monitoring symbol in the slot (e.g., the first symbol (s) of CORESET)
  • An opportunity (eg, time / frequency resource) to monitor PDCCH candidates is defined as a PDCCH (monitoring) opportunity.
  • PDCCH monitoring
  • One or more PDCCH (monitoring) opportunities can be configured in the slot.
  • Table 2 illustrates the features of each search space type.
  • Type Search space RNTI Use case Type0-PDCCH Common SI-RNTI on a primary cell SIB Decoding Type0A-PDCCH Common SI-RNTI on a primary cell SIB Decoding Type1-PDCCH Common RA-RNTI or TC-RNTI on a primary cell Msg2, Msg4 decoding in RACH Type2-PDCCH Common P-RNTI on a primary cell Paging Decoding Type3-PDCCH Common INT-RNTI, SFI-RNTI, TPC-PUSCH-RNTI, TPC-PUCCH-RNTI, TPC-SRS-RNTI, C-RNTI, MCS-C-RNTI, or CS-RNTI (s) UE Specific C-RNTI, or MCS-C-RNTI, or CS-RNTI (s) User specific PDSCH decoding
  • Table 3 illustrates the DCI formats transmitted on the PDCCH.
  • DCI format 0_0 is used for scheduling TB-based (or TB-level) PUSCH
  • DCI format 0_1 is TB-based (or TB-level) PUSCH or Code Block Group (CBG) -based (or CBG-level) PUSCH It can be used to schedule.
  • DCI format 1_0 is used for scheduling TB-based (or TB-level) PDSCH
  • DCI format 1_1 is used for scheduling TB-based (or TB-level) PDSCH or CBG-based (or CBG-level) PDSCH.
  • DCI format 0_0 / 0_1 may be referred to as UL grant DCI or UL scheduling information
  • DCI format 1_0 / 1_1 may be referred to as DL grant DCI or UL scheduling information
  • DCI format 2_0 is used to deliver dynamic slot format information (eg, dynamic SFI) to the UE
  • DCI format 2_1 is used to deliver downlink pre-Emption information to the UE.
  • DCI format 2_0 and / or DCI format 2_1 may be delivered to UEs in a corresponding group through a group common PDCCH, which is a PDCCH delivered to UEs defined as one group.
  • DCI format 0_0 and DCI format 1_0 may be referred to as a fallback DCI format
  • DCI format 0_1 and DCI format 1_1 may be referred to as a non-fallback DCI format.
  • the fallback DCI format remains the same in the DCI size / field configuration regardless of the UE setting.
  • the non-fallback DCI format the DCI size / field configuration varies according to UE configuration.
  • PDSCH carries downlink data (eg, DL-SCH transport block, DL-SCH TB), and modulation methods such as Quadrature Phase Shift Keying (QPSK), 16 Quadrature Amplitude Modulation (QAM), 64 QAM, and 256 QAM are applied. do.
  • QPSK Quadrature Phase Shift Keying
  • QAM 16 Quadrature Amplitude Modulation
  • a codeword is generated by encoding the TB.
  • the PDSCH can carry up to two codewords. Scrambling and modulation mapping may be performed for each codeword, and modulation symbols generated from each codeword may be mapped to one or more layers. Each layer is mapped to a resource together with a DMRS (Demodulation Reference Signal) to generate an OFDM symbol signal, and is transmitted through a corresponding antenna port.
  • DMRS Demodulation Reference Signal
  • UCI Uplink Control Information
  • SR Service Request: Information used for requesting a UL-SCH resource.
  • HARQ (Hybrid Automatic Repeat reQuest) -ACK (Acknowledgement): A response to a downlink data packet (eg, a codeword) on a PDSCH. Indicates whether the downlink data packet was successfully received.
  • One bit of HARQ-ACK may be transmitted in response to a single codeword, and two bits of HARQ-ACK may be transmitted in response to two codewords.
  • HARQ-ACK responses include positive ACK (simply ACK), negative ACK (NACK), DTX, or NACK / DTX.
  • HARQ-ACK is mixed with HARQ ACK / NACK, ACK / NACK.
  • CSI Channel State Information
  • MIMO Multiple Input Multiple Output
  • RI rank indicator
  • PMI precoding matrix indicator
  • Table 4 illustrates the PUCCH formats. According to the PUCCH transmission length may be divided into Short PUCCH (format 0, 2) and Long PUCCH (format 1, 3, 4).
  • PUCCH format 0 carries a UCI of up to 2 bits in size, and is mapped and transmitted on a sequence basis. Specifically, the terminal transmits one sequence of the plurality of sequences through the PUCCH of PUCCH format 0 to transmit a specific UCI to the base station. Only when a positive SR is transmitted, the UE transmits a PUCCH having a PUCCH format 0 in a PUCCH resource for corresponding SR configuration.
  • PUCCH format 1 carries UCI of up to 2 bits in size, and modulation symbols are spread by an orthogonal cover code (OCC) that is set differently depending on whether frequency hopping or not.
  • OCC orthogonal cover code
  • the DMRS is transmitted in a symbol in which a modulation symbol is not transmitted (that is, transmitted by time division multiplexing (TDM)).
  • PUCCH format 2 carries UCI of a bit size larger than 2 bits, and modulation symbols are transmitted by DMRS and Frequency Division Multiplexing (FDM).
  • the DM-RS is located at symbol indexes # 1, # 4, # 7 and # 10 in a given resource block with a density of 1/3.
  • PN Pulseudo Noise sequence is used for the DM_RS sequence.
  • Frequency hopping may be enabled for two symbol PUCCH format 2.
  • PUCCH format 3 is not UE multiplexed in the same physical resource blocks and carries a UCI of a bit size larger than 2 bits.
  • the PUCCH resource of PUCCH format 3 does not include an orthogonal cover code.
  • the modulation symbol is transmitted after being time division multiplexed (DMD) with DMRS.
  • PUCCH format 4 supports multiplexing up to 4 terminals in the same physical resource block, and carries UCI of a bit size larger than 2 bits.
  • the PUCCH resource in PUCCH format 3 includes an orthogonal cover code.
  • the modulation symbol is transmitted after being time division multiplexed (DMD) with DMRS.
  • PUSCH carries uplink data (eg, UL-SCH transport block, UL-SCH TB) and / or uplink control information (UCI), and uses a Cyclic Prefix-Orthogonal Frequency Division Multiplexing (CP-OFDM) waveform or It is transmitted based on a Discrete Fourier Transform-spread-Orthogonal Frequency Division Multiplexing (DFT-s-OFDM) waveform.
  • DFT-s-OFDM Discrete Fourier Transform-spread-Orthogonal Frequency Division Multiplexing
  • the terminal transmits the PUSCH by applying transform precoding.
  • the UE transmits a PUSCH based on the CP-OFDM waveform
  • conversion precoding eg, transform precoding is enabled
  • the terminal is CP- PUSCH may be transmitted based on an OFDM waveform or a DFT-s-OFDM waveform.
  • PUSCH transmissions are dynamically scheduled by UL grants in DCI or semi-static based on higher layer (eg RRC) signaling (and / or Layer 1 (L1) signaling (eg PDCCH)). Can be scheduled (configured grant).
  • PUSCH transmission may be performed based on codebook or non-codebook.
  • the correct signal can be received by finding out the channel information and correcting the distortion of the transmission signal by the channel information in the received signal.
  • it is mainly used to find the information of the channel with the degree of distortion of the signal when the signal is transmitted through both the transmitting side and the receiving side.
  • a signal that is known to both the transmitting side and the transmitting side is called a pilot signal or a reference signal.
  • a multiple transmission antenna and multiple reception antennas are adopted to improve transmission and reception data efficiency.
  • This technology is designed to increase capacity or improve performance by using multiple antennas at the transmitting or receiving end of a mobile communication system.In the case of transmitting and receiving data using multiple antennas, there is a separate reference signal for each transmitting antenna. You need to know the channel status between the receiving antennas in order to receive the correct signal.
  • RS can be classified into two types according to its purpose. There are RSs for channel information acquisition and RSs used for data demodulation.
  • the former means that the UE can acquire channel information on the downlink, and therefore, it should be transmitted over a wide band, and a UE that does not receive downlink data in a specific subframe should be able to receive and measure its RS. It is also used for measurement such as handover.
  • the latter is an RS that the base station sends along with the corresponding resource when the base station transmits a downlink, and the UE can perform channel measurement by receiving the RS, and thus can demodulate the data. This RS should be transmitted in the area where data is transmitted.
  • the terminal may detect the PDCCH in slot #n.
  • the PDCCH includes uplink scheduling information (eg, DCI formats 0_0 and 0_1).
  • the DCI formats 0_0 and 0_1 may include the following information.
  • Frequency domain resource assignment indicates the RB set allocated to the PUSCH
  • Time domain resource assignment indicates slot offset K2, starting position (eg symbol index) and length (eg number of OFDM symbols) of the PUSCH in the slot.
  • the start symbol and the length may be indicated through a SLIV (Start and Length Indicator Value) or may be indicated separately.
  • the UE may transmit the PUSCH in slot # (n + K2) according to the scheduling information of slot #n.
  • the PUSCH includes a UL-SCH TB.
  • the 3GPP standardization organization is progressing the standardization of 5G wireless communication system named NR (New RAT).
  • the 3GPP NR system supports multiple logical networks in a single physical system, and has various requirements by changing transmission time interval (TTI), OFDM numerology (e.g., OFDM symbol duration, subcarrier spacing). It is designed to support services (eg eMBB, mMTC, URLLC, etc.).
  • TTI transmission time interval
  • OFDM numerology e.g., OFDM symbol duration, subcarrier spacing
  • eMBB eMBB
  • mMTC subcarrier spacing
  • URLLC etc.
  • LAA licensed-assisted access
  • NR UCells NR cells in the unlicensed band are aimed at standalone (SA) operation.
  • SA standalone
  • PUCCH, PUSCH, and PRACH transmission may be supported in the NR UCell.
  • FIG 8 shows an example of a wireless communication system supporting an unlicensed band applicable to the present invention.
  • a cell operating in a licensed band (hereinafter referred to as L-band) is defined as an L-cell, and a carrier of the L-cell is defined as (DL / UL) LCC.
  • a cell operating in an unlicensed band (hereinafter referred to as U-band) is defined as a U-cell, and a carrier of the U-cell is defined as (DL / UL) UCC.
  • the carrier / carrier-frequency of the cell may mean the operating frequency (eg, center frequency) of the cell.
  • a cell / carrier (e.g., CC) is commonly referred to as a cell.
  • one terminal may transmit and receive a signal with a base station through a plurality of merged cells / carriers.
  • one CC may be set as a primary CC (PCC) and the other CC may be set as a secondary CC (SCC).
  • Specific control information / channel eg, CSS PDCCH, PUCCH
  • FIG. 8 (a) illustrates a case where a terminal and a base station transmit and receive signals through an LCC and a UCC (NSA (non-standalone) mode).
  • the LCC may be set to PCC and the UCC may be set to SCC.
  • one specific LCC may be set to PCC and the other LCCs may be set to SCC.
  • 8 (a) corresponds to LAA of 3GPP LTE system.
  • 8 (b) illustrates a case in which the UE and the base station transmit and receive signals through one or more UCCs without an LCC (SA mode). in this case.
  • One of the UCCs may be set to PCC and the other UCC may be set to SCC. In the unlicensed band of 3GPP NR system, both NSA mode and SA mode can be supported.
  • a communication node in the unlicensed band must determine whether the channel of other communication node (s) is used before transmitting a signal.
  • the communication node may first perform carrier sensing (CS) before signal transmission to determine whether other communication node (s) transmit signal.
  • CS carrier sensing
  • CCA clear channel assessment
  • the communication node determines the channel state to be busy if energy above the CCA threshold is detected on the channel, otherwise the channel state is busy. Can be determined as an idle.
  • the communication node may start signal transmission in the UCell.
  • the CCA threshold is defined as -62dBm for non-Wi-Fi signals and -82dBm for Wi-Fi signals.
  • LBT Listen-Before-Talk
  • CAP Channel Access Procedure
  • the terminal performs a contention-based CAP for uplink signal transmission in the unlicensed band.
  • a plurality of CAP types ie, LBT types
  • the terminal performs Type 1 or Type 2 CAP for uplink signal transmission in the unlicensed band.
  • the terminal may perform a CAP (eg, Type 1 or Type 2) set by the base station for uplink signal transmission.
  • FIG. 9 is a flowchart illustrating a type 1 CAP operation of a terminal for uplink signal transmission.
  • the terminal may initiate a channel access procedure (CAP) for signal transmission through the unlicensed band (S1110).
  • the terminal may arbitrarily select the backoff counter N in the contention window CW according to step 1.
  • the N value is set to an initial value N init (S1120).
  • N init is selected from any value between 0 and CW p .
  • the terminal terminates the CAP process (S1132).
  • the terminal may perform Tx burst transmission (S1134).
  • the backoff counter value is not 0 (S1130; N)
  • the terminal decreases the backoff counter value by 1 according to step 2 (S1140).
  • the terminal checks whether the channel of the U-cell (s) is in the idle state (S1150), and if the channel is in the idle state (S1150; Y), checks whether the backoff counter value is 0 (S1130). On the contrary, if the channel is not idle in step S1150, that is, if the channel is busy (S1150; N), the UE according to step 5 has a delay duration T d longer than the slot time (eg 9usec) (more than 25usec). It is checked whether the corresponding channel is in an idle state (S1160). If the channel is idle in the delay period (S1170; Y), the terminal may resume the CAP process again.
  • the delay period may include a 16usec interval and m p consecutive slot times immediately following (eg, 9usec).
  • the UE re-performs step S1160 to check again whether the channel is idle for a new delay period.
  • Table 5 illustrates the difference of m p , minimum CW, maximum CW, maximum channel occupancy time (MCOT) and allowed CW sizes applied to the CAP according to the channel access priority class. .
  • the contention window size applied to the Type 1 uplink CAP may be determined based on various methods. As an example, the contention window size may be adjusted based on whether to toggle a new data indicator (NDI) value for at least one HARQ processor associated with HARQ_ID_ref, which is a HARQ process ID of the UL-SCH within a predetermined time interval (eg, a reference TU). have.
  • NDI new data indicator
  • the terminal performs signal transmission using a Type 1 channel access procedure related to the channel access priority class p on the carrier, if the terminal toggles NDI values for at least one HARQ process associated with HARQ_ID_ref, all priority classes for, Set to, otherwise, all priority classes Increase CW p for the next higher allowed value.
  • the UE When the UE uses a Type 2 CAP for transmitting an uplink signal (eg, a signal including a PUSCH) through an unlicensed band, the UE at least senses a duration. While transmitting the uplink signal (for example, a signal including a PUSCH) through the unlicensed band immediately after sensing that the channel is idle. Is one slot interval Immediately following (immediately followed) It consists of. T f includes an idle slot section T sl at the start of the T f .
  • an uplink signal eg, a signal including a PUSCH
  • the B-IFDMA structure divides the entire band into a plurality of interlaces.
  • K REs (or RBs) contiguous on the frequency axis may constitute one cluster, and a plurality of clusters having L clusters (or RBs) may form an interlace.
  • the system band may be divided into 10 interlaces having a cluster size of 1 RB and an inter-cluster spacing of 10 RBs.
  • cluster #n may be defined as ⁇ RB # (10 * m + n) ⁇ . Where n represents a cluster index and m represents an interlace index within a cluster.
  • the present invention proposes a PUCCH and PUSCH transmission scheme in consideration of flexible OFDM numerology of NR system, B-IFDMA structure in U-band, and LBT operation.
  • UCI Means control information transmitted by the terminal UL.
  • UCI contains several types of control information (ie, UCI type).
  • UCI may include HARQ-ACK (simply A / N, AN), SR, CSI.
  • PUCCH means a physical layer UL channel for UCI transmission.
  • the PUCCH resources set by the base station and / or indicating transmission are named as A / N PUCCH resources, SR PUCCH resources, and CSI PUCCH resources, respectively.
  • PUSCH means a physical layer UL channel for UL data transmission.
  • the slot includes a plurality of symbols.
  • the symbol includes an OFDM-based symbol (eg, a CP-OFDM symbol, a DFT-s-OFDM symbol).
  • a symbol, an OFDM-based symbol, an OFDM symbol, a CP-OFDM symbol, and a DFT-s-OFDM symbol may be replaced with each other.
  • LBT type This may mean a (differentiated) LBT execution method from a CS (Channel Sensing) point of view.
  • the LBT type is mixed with the CAP type.
  • the LBT type may include the Type 1 CAP (see FIG. 9) and the Type 2 CAP described above.
  • Type 1 CAP (or CAP / LBT type 1) refers to an LBT that performs random back-off using a contention window (CW).
  • CW contention window
  • the transmitting node may perform random back-off using CW. If the channel is sensed to be empty even in the random back-off process, the transmitting node may transmit a signal.
  • the size of the contention window CW may be fixed or variable, and thus the LBT type may be further divided.
  • Type 2 CAP refers to an LBT in which a transmitting node performs channel sensing only and does not perform random back-off. In detail, when the channel is sensed empty for a predetermined time, the transmitting node may transmit a signal immediately without random back-off.
  • the PUCCH format may be classified as follows according to the UCI payload size and / or transmission length (eg, the number of symbols constituting the PUCCH resource). For information on the PUCCH format, refer to Table 4 together.
  • Transmission structure consists of UCI signal only without DMRS and transmits UCI status by selecting and transmitting one of a plurality of sequences
  • DMRS and UCI are configured in TDM format with different OFDM symbols, and UCI multiplies a specific sequence by modulation (eg, QPSK) symbols.
  • CS Cyclic Shift
  • OCC Orthogonal Cover Code
  • -Transmission structure A structure in which DMRS and UCI are configured / mapped in FDM form in the same symbol and are transmitted by applying only IFFT without DFT to encoded UCI bits.
  • -Transmission structure A structure in which DMRS and UCI are configured / mapped in different symbols in the form of TDM, and are transmitted without multiplexing between terminals by applying DFT to encoded UCI bits.
  • Transmission structure A form in which DMRS and UCI are configured / mapped in a TDM form on different symbols and a DFT is applied to encoded UCI bits.
  • UCI is applied at the front end of UCI and CS (or IFDM mapping) is applied to DMRS to support multiplexing to multiple terminals.
  • PUCCH resources may be determined for each UCI type (eg, A / N, SR, CSI).
  • PUCCH resources used for UCI transmission may be determined based on UCI (payload) size.
  • the base station may set a plurality of PUCCH resource sets to the terminal, and the terminal may select a specific PUCCH resource set corresponding to the specific range according to the range of the UCI (payload) size (eg, the number of UCI bits).
  • the UE may select one of the following PUCCH resource sets according to the number of UCI bits (N UCI ).
  • PUCCH resource set # 1 if 2 ⁇ number of UCI bits ⁇ N 1
  • K represents the number of PUCCH resource sets (K> 1)
  • N i is the maximum number of UCI bits supported by PUCCH resource set #i.
  • PUCCH resource set # 1 may be configured of resources of PUCCH formats 0-1, and other PUCCH resource sets may be configured of resources of PUCCH formats 2-4 (see Table 4).
  • the PUCCH resource to be used for UCI transmission in the PUCCH resource set may be configured through higher layer signaling (eg, RRC signaling).
  • the UCI type is HARQ-ACK for a Semi-Persistent Scheduling (SPS) PDSCH
  • the PUCCH resource to be used for UCI transmission in the PUCCH resource set may be configured through higher layer signaling (eg, RRC signaling).
  • the UCI type is HARQ-ACK for a PDSCH (ie, PDSCH scheduled by DCI)
  • the PUCCH resource to be used for UCI transmission in the PUCCH resource set may be scheduled based on DCI.
  • the base station transmits the DCI to the UE through the PDCCH, and may indicate the PUCCH resource to be used for UCI transmission in a specific PUCCH resource set through an ACK (ACK / NACK Resource Indicator) in the DCI.
  • the ARI is used to indicate a PUCCH resource for ACK / NACK transmission and may be referred to as a PRI (PUCCH Resource Indicator).
  • DCI is a DCI used for PDSCH scheduling
  • UCI may include HARQ-ACK for PDSCH.
  • the base station may set a PUCCH resource set composed of more PUCCH resources than a state that can be represented by the ARI to the terminal using a (terminal-specific) higher layer (eg, RRC) signal.
  • the ARI indicates a PUCCH resource sub-set in the PUCCH resource set, and which PUCCH resource is used in the indicated PUCCH resource sub-set based on transmission resource information (eg, starting CCE index of the PDCCH) of the PDCCH. It may be determined according to an implicit rule.
  • the UE In the NR U-band, the UE must perform an LBT operation before the UE performs PUSCH (or PUCCH) transmission. Therefore, when the UE attempts to transmit only on (single) UL resources scheduled by the base station, the UL transmission probability is relatively low. It may not be high. Accordingly, an operation of supporting a plurality of transmission resource candidates for a (single) PUSCH (or PUCCH) transmission indication may be considered to increase the UL transmission probability. For example, the base station sets a plurality of transmission resource candidates to the terminal in advance, and the terminal selects one transmission resource candidate among the plurality of transmission resource candidates according to the channel access point after performing the LBT operation and selects a PUSCH ( Or PUCCH).
  • the plurality of transmission resource candidate (s) may be configured for each PUSCH (or PUCCH) resource.
  • the plurality of transmission resource candidate (s) may be set in terms of transmission start symbols independently of a PUSCH (or PUCCH) resource.
  • a plurality of transmission start symbol candidates may be set and applied to the indicated PUSCH (or PUCCH) transmission resource.
  • the base station may set the plurality of transmission resource candidate (s) for (single) PUSCH (or PUCCH) transmission in one or more of the following ways.
  • the base station may configure a plurality of transmission resource candidate (s) for (single) PUSCH (or PUCCH) transmission to the terminal through system information and / or higher layer signal (eg, RRC signal).
  • a plurality of transmission resource candidates may be configured for each PUSCH resource (or PUCCH resource or PUCCH resource set).
  • the plurality of transmission resource candidates may be distinguished in terms of transmission start symbol, transmission length (eg, transmission symbol number and / or transmission slot number), and / or LBT type.
  • PUSCH (or PUCCH) ⁇ resource # which is a plurality of resource candidates, for PUSCH (or PUCCH) resource #A A 1 , resource #A 2 , ..., resource #A n ⁇ may be set.
  • the UE may perform an LBT procedure on the PUSCH (or PUCCH) ⁇ resource #A 1 , resource #A 2 , ..., resource #A n ⁇ .
  • a plurality of transmission start symbol (or offset for transmission start symbol) candidate (s) may be set.
  • the PUSCH resource or PUCCH resource or PUCCH resource set
  • the PUSCH resource may be set identically or independently for each transmission start symbol (or offset with respect to the transmission start symbol).
  • the UE may perform PUSCH (or PUCCH) transmission by selecting one of the plurality of transmission resource candidate (s) according to the LBT operation.
  • PUSCH or PUCCH
  • the base station may indicate information on whether to allow only (single) transmission resources or to allow a plurality of transmission resource candidate (s) in a PUSCH (or PUCCH) transmission by a higher layer signal and / or a DCI.
  • the LBT operation must be performed before the UE performs the PUSCH (or PUCCH) transmission. Therefore, the LBT type for the PUSCH (or PUCCH) transmission must be configured.
  • the LBT type may be set for each PUSCH resource (or PUCCH resource) or may be indicated independently of the indication for the PUSCH resource (or PUCCH resource or PUCCH resource set). In the latter case, the UE may interpret the indication of the PUSCH resource (or PUCCH resource or PUCCH resource set) differently according to the LBT type. That is, the PUSCH resource (or PUCCH resource or PUCCH resource set) configuration may be different for each LBT type.
  • the base station may indicate the LBT type by using one or more of the following for (single) PUSCH (or PUCCH) transmission.
  • Opt. 1 It may indicate an LBT type in association with a PUSCH resource (or PUCCH resource or PUCCH resource set).
  • the base station may (independently) set the LBT type per PUCCH resource (or resource set) through system information and / or higher layer signal.
  • an LBT type may be set for each interlace.
  • the LBT type may be identified based on the first interlace (or RB) among the plurality of interlaces (or RBs) allocated for PUSCH transmission.
  • an LBT type may be configured as follows for each PUCCH resource.
  • the LBT type may be configured as follows for each PUCCH resource set.
  • the LBT type may be indicated independently of the indication of the PUSCH resource (or PUCCH resource or PUCCH resource set).
  • the base station may indicate the LBT type for PUCCH transmission in the DL scheduling DCI (eg, DL assignment).
  • the UE may interpret the indication of the PUSCH resource (or PUCCH resource or PUCCH resource set) in another manner according to the LBT type indicated by the base station.
  • the PUSCH resource (or PUCCH resource or PUCCH resource set) configuration may be different for each LBT type.
  • the interlace (or RB) used for PUSCH transmission may be interpreted differently according to the LBT type.
  • the resource allocation information in the UL grant may indicate a value of 1-5.
  • 1 to 5 indicated by the resource allocation information may correspond to ⁇ 1,3,5,7,9 ⁇ or ⁇ 2,4,6,8,10 ⁇ .
  • an LBT type may be configured as follows for each PUCCH resource.
  • the LBT type may be configured as follows for each PUCCH resource set.
  • PUCCH resource set # 1_2 if 2 ⁇ number of UCI bits ⁇ N 1 and LBT type #b
  • PUCCH resource set # (K-1) _2 if N K-2 ⁇ number of UCI bits ⁇ N K-1 and LBT type #b
  • the UE may perform a PUSCH (or PUCCH) transmission using a PUSCH resource (or PUCCH resource) that succeeded in LBT after performing an LBT procedure according to the LBT type.
  • a periodic SR resource is set up like the NR system (ie, an NR L-band system), and the SR resource is reserved as a UL resource, which is an NR U- which requires more dynamic TDD characteristics due to LBT operation. May not be suitable for band systems.
  • the present invention sets a periodic time window for SR transmission in the NR U-band, and the UE multiplexes HARQ-ACK and SR only when there is a PUCCH resource for HARQ-ACK transmission within the time window.
  • the time window may not be used for the SR only purpose. That is, when reporting only SR without HARQ-ACK, the UE cannot transmit the SR within the time window and may report the SR only information in the RACH opportunity in the form of the RACH preamble.
  • the base station sets the (periodic) time window for the (periodic) SR transmission, and the terminal may perform the SR transmission as follows in the time window.
  • HARQ-ACK and SR may be multiplexed and transmitted through a PUCCH resource.
  • PUCCH resources may be PUCCH resources allocated for HARQ-ACK transmission purposes or PUCCH resources allocated for multiplexed UCI between HARQ-ACK and SR.
  • SR transmission may not be performed.
  • an interlace resource on a frequency axis is defined as a plurality of clusters having a constant cluster size and cluster interval
  • PRB (s) on the plurality of interlace resource (s) are allocated as PUSCH (or PUCCH) transmission resources
  • HARQ-ACK and SR may be separately encoded and transmitted through interlaced resource (s).
  • the UE may identify HARQ-ACK and a plurality of different times when HARQ-ACK transmission exists in the time interval. If the SR information is reported (multiplexed) and there is no HARQ-ACK transmission in the time interval, the SR transmission may not be performed.
  • the PUCCH formats eg PUCCH formats 0/1/2/3/4
  • at least a single PUCCH resource is interlaced resource (or multi-cluster resource) on the frequency axis. It should be possible to form.
  • a sequence-based PUCCH such as PUCCH format 0/1 is configured as an interlace resource
  • the size of the UCI payload to be transmitted is very small, but the amount of frequency axis resources occupied by one to two bits may not be efficient. have.
  • a sequence-based PUCCH format such as PUCCH format 0/1 is excluded, and only an extended form of a PUCCH format (eg, PUCCH format 2/3/4) that the UE encodes and transmits UCI payload is introduced. Can be.
  • the (initial or default) PUCCH resources used for HARQ-ACK reporting purposes before the UE receives the RRC configuration or before the UE-specific (dedicated) PUCCH resources are set may also follow the UCI encoding-based PUCCH format.
  • the UE since the size of the HARQ-ACK information will be significantly smaller, the UE may consider the operation of reporting additional information.
  • the additional information may be information including CSI, radio resource management (RRM) measurement, etc., which may help a quick link adaptation of the UE, or information including a BSR (buffer status report) for fast UL resource allocation. have.
  • the additional information may include LBT related information such as LBT success probability (or CCA success rate) for the current channel.
  • the terminal may use one or more of the following other than HARQ-ACK as the PUCCH resource. Additional information can be included and sent.
  • LBT related information e.g. busy / idle ratio information in channel
  • the terminal does not perform the symbol-based LBT in performing LBT before uplink (eg, PUSCH) transmission to the base station.
  • the base station may indicate one of four candidate symbols in one slot as a PUSCH transmission start symbol by using two bits.
  • the UE fails by performing LBT before the PUSCH transmission start symbol indicated in the first slot, the UE performs LBT before the PUSCH transmission start symbol indicated in the second slot.
  • the UE is based on the relative positional relationship between the first scheduled PUSCH transmission start symbol and the DMRS transmission symbol without additional signaling from the base station.
  • the LBT procedure may be performed in units of symbols by applying one or more candidate start symbols to PUSCH transmission. For example, in the U-band, in consideration of the inefficiency of the PUSCH transmission drop due to the LBT failure of the UE, a plurality of candidate start symbols for PUSCH transmission may be set.
  • the UE does not separately receive the candidate start symbol for PUSCH transmission, but rather the UE starts the candidate start symbol for PUSCH transmission based on the relative positional relationship between the PUSCH transmission start symbol position and the DMRS mapping position received as uplink scheduling information. This can be determined.
  • a plurality of candidates for a symbol may be differently set / applied.
  • mapping types for time resources of PUSCH-DMRS there are two mapping types for time resources of PUSCH-DMRS.
  • PUSCH mapping type A means a type in which the first DMRS symbol is mapped to a fixed symbol position in a slot
  • PUSCH mapping type B means a type in which the first DMRS symbol is mapped to the same symbol position as a scheduled PUSCH transmission start symbol. do.
  • transmission start symbols and PUSCH lengths of PUSCHs for each PUSCH mapping type according to a normal CP and an extended CP are shown in Table 8.
  • the index of the transmission start symbol of the PUSCH may be fixed to '0'.
  • the PUSCH mapping type B in the case of a normal CP, it may be one symbol of symbol indices 0 to 13.
  • the first DMRS symbol in the PUSCH may be transmitted at the position of symbol index 2 or symbol index 3 on a slot basis (PUSCH mapping type A).
  • PUSCH mapping type A when the transmission start symbol of the scheduled PUSCH is earlier than the first DMRS symbol, a plurality of (or more than one) symbols may be set as candidate start symbols for PUSCH transmission in front of the first DMRS symbol. Otherwise (ie, if the transmission start symbol of the first scheduled PUSCH is equal to the first DMRS symbol), one transmission start symbol candidate (ie, the corresponding DMRS symbol) is set as a candidate start symbol for PUSCH transmission before the first DMRS symbol. Can be. For example, in the former case (ie, a plurality of transmission start symbol candidates), transmission may be started after the LBT attempt (eg, PUSCH transmission) for the following four positions.
  • LBT attempt eg, PUSCH transmission
  • Position 1 immediately before symbol 0 to 25 usec
  • the UE may consider an operation of starting transmission after the LBT attempt only immediately before 25 usec in the DMRS symbol.
  • the terminal may try LBT until immediately before 25usec.
  • the UE may consider the operation of starting the PUSCH transmission after performing LBT only immediately before 25 usec in the DMRS symbol.
  • the time of 25 usec is an example, and is not limited to 25 usec
  • 25 usec is a time considering a length of a minimum sensing period according to uplink LBT type 2.
  • the uplink scheduling information including the mapping type of the first DMRS symbol and the PUSCH transmission start symbol may be transmitted by the base station to the terminal through the PDCCH.
  • a plurality of transmission start symbol candidates between the first DMRS (unit) and the second DMRS (unit) can be set.
  • the position of the additional DMRS may be set through the PDCCH.
  • the UE may perform LBT sequentially from the index of the first DMRS symbol to the index of the additional DMRS symbol (when partial TTI transmission is allowed / available).
  • Whether partial TTI transmission is possible during PUSCH transmission may be related to whether additional DMRS is configured.
  • the base station sets the partial TTI to the UE as a higher layer signal such as RRC signaling, and if there is no additional DMRS, allows the entire PUSCH transmission or omitting the PUSCH transmission according to the LBT operation result, and if there is additional DMRS, It may be allowed to perform (delayed) PUSCH transmission on the plurality of transmission start symbol candidate (s). In this case, even if the first transmission start symbol fails, the UE may omit transmission for some symbol groups including the first DMRS and then perform LBT for (shorten) PUSCH transmission after some symbol groups including the second DMRS. .
  • the UE may receive uplink scheduling information for PUSCH transmission from the base station through the PDCCH, and the scheduling information may include a PUSCH mapping type indicating a PUSCH transmission start symbol and a DMRS mapping type.
  • the UE is determined according to the relative positional relationship between the PUSCH transmission start symbol included in the uplink scheduling information and the position of the first DMRS symbol without separate signaling or separate scheduling reception for one or more candidate start symbols for PUSCH transmission.
  • CAP may be sequentially performed on the above symbols. The UE sequentially performs the CAP until the first DRMS symbol, and if the CAP succeeds, the UE may start the PUSCH transmission. If the CAP is not successful until the first DMRS symbol, the UE may drop the PUSCH transmission.
  • FIG. 10 is a schematic diagram of LBT candidate symbols according to DMRS positions for each PUSCH mapping type.
  • FIG. 10 (a) illustrates PUSCH mapping type A.
  • FIG. 10 (a) when the DMRS is mapped to the symbol index 2 and the symbol index 0 is the index of the scheduled PUSCH transmission start symbol, when the UE performs the CAP for PUSCH transmission, the CAP symbol candidates are the symbol X. (Symbol index 0), symbol Y (symbol index 1), and symbol Z (symbol index 2).
  • the terminal may perform the CAP before or after a specific time based on each of symbols X, Y, and Z.
  • the specific time may be determined in consideration of the minimum time interval (eg, 25 usec) required for the CAP procedure, that is, channel sensing.
  • the UE performs a CAP before a specific time of the symbol Z to which the first DMRS is mapped. can do.
  • FIG. 10 (b) illustrates the PUSCH mapping type B.
  • the PUSCH transmission start symbol is symbol Z (symbol index 4)
  • the first DMRS is mapped to symbol Z according to the position of the PUSCH transmission start symbol.
  • the terminal may perform the CAP before a specific time of the symbol Z.
  • FIG. 11 illustrates a DMRS location and a CAP for PUSCH transmission according to PUSCH mapping type A.
  • FIG. 11 (a) shows that the first DMRS is mapped to symbol index 2.
  • symbol index 0 is a transmission start symbol of a scheduled PUSCH
  • the UE sequentially performs CAP from symbol index 0 to symbol index 2.
  • FIG. If the UE does not succeed in CAP until the symbol index 2, the PUSCH transmission may be dropped.
  • the base station may configure the partial TTI through the upper layer signal (eg, RRC) to the terminal and configure additional DMRS through the PDCCH.
  • the partial TTI in which the partial TTI is not configured, if the UE fails by performing a CAP to symbol index 2, the UE may drop the PUSCH transmission.
  • the UE when a partial TTI is set and additional DMRSs are mapped to a specific symbol (for example, symbol index 7), the UE may perform CAP up to symbol index 7. If the CAP succeeds, PUSCH transmission is performed for the remaining partial TTI. You can start .
  • FIG. 12 illustrates a signal transmission process according to an embodiment of the present invention.
  • the terminal may receive uplink scheduling information from the base station (S1210).
  • the uplink scheduling information includes a PUSCH mapping type including a DMRS mapping type and a PUSCH transmission start symbol index and may be received through a PDCCH.
  • the UE may determine one or more candidate start symbols for PUSCH transmission in consideration of the relative positional relationship between the index of the scheduled PUSCH transmission start symbol and the index of the symbol to which the DMRS is mapped.
  • the UE may sequentially perform CAP for PUSCH transmission in the candidate start symbol (S1220).
  • the UE may start uplink (PUSCH) transmission in the CAP success symbol (S1230).
  • the UE does not separately signal a plurality of PUSCH transmission symbol candidates.
  • the UE may perform PUSCH transmission by performing CAP on one or more symbols based on a PUSCH transmission start symbol and DMRS mapping type received as existing uplink scheduling information.
  • FIG. 13 illustrates a communication system 1 applied to the present invention.
  • a communication system 1 applied to the present invention includes a wireless device, a base station and a network.
  • the wireless device refers to a device that performs communication using a radio access technology (eg, 5G New RAT (Long Term), Long Term Evolution (LTE)), and may be referred to as a communication / wireless / 5G device.
  • the wireless device may be a robot 100a, a vehicle 100b-1, 100b-2, an eXtended Reality (XR) device 100c, a hand-held device 100d, a home appliance 100e. ), IoT (Internet of Thing) device (100f), AI device / server 400 may be included.
  • the vehicle may include a vehicle having a wireless communication function, an autonomous vehicle, a vehicle capable of performing inter-vehicle communication, and the like.
  • the vehicle may include an unmanned aerial vehicle (UAV) (eg, a drone).
  • UAV unmanned aerial vehicle
  • XR devices include AR (Augmented Reality) / VR (Virtual Reality) / MR (Mixed Reality) devices, Head-Mounted Device (HMD), Head-Up Display (HUD), television, smartphone, It may be implemented in the form of a computer, a wearable device, a home appliance, a digital signage, a vehicle, a robot, and the like.
  • the portable device may include a smartphone, a smart pad, a wearable device (eg, smart watch, smart glasses), a computer (eg, a notebook, etc.).
  • the home appliance may include a TV, a refrigerator, a washing machine, and the like.
  • IoT devices may include sensors, smart meters, and the like.
  • the base station and the network may be implemented as a wireless device, and the specific wireless device 200a may operate as a base station / network node to other wireless devices.
  • the wireless devices 100a to 100f may be connected to the network 300 through the base station 200.
  • AI Artificial Intelligence
  • the network 300 may be configured using a 3G network, a 4G (eg LTE) network or a 5G (eg NR) network.
  • the wireless devices 100a-100f may communicate with each other via the base station 200 / network 300, but may also communicate directly (e.g. sidelink communication) without going through the base station / network.
  • the vehicles 100b-1 and 100b-2 may perform direct communication (e.g. vehicle to vehicle (V2V) / vehicle to everything (V2X) communication).
  • the IoT device eg, sensor
  • the IoT device may directly communicate with another IoT device (eg, sensor) or another wireless device 100a to 100f.
  • Wireless communication / connection 150a, 150b, 150c may be performed between the wireless devices 100a-100f / base station 200 and base station 200 / base station 200.
  • the wireless communication / connection is various wireless connections such as uplink / downlink communication 150a, sidelink communication 150b (or D2D communication), inter-base station communication 150c (eg relay, integrated access backhaul), and the like.
  • Technology eg, 5G NR
  • wireless communication / connections 150a, 150b, 150c, the wireless device and the base station / wireless device, the base station and the base station may transmit / receive radio signals to each other.
  • the wireless communication / connection 150a, 150b, 150c may transmit / receive signals over various physical channels.
  • a wireless signal for transmission / reception At least some of various configuration information setting processes, various signal processing processes (eg, channel encoding / decoding, modulation / demodulation, resource mapping / demapping, etc.) and resource allocation processes may be performed.
  • FIG. 14 illustrates a wireless device that can be applied to the present invention.
  • the first wireless device 100 and the second wireless device 200 may transmit and receive wireless signals through various wireless access technologies (eg, LTE and NR).
  • the ⁇ first wireless device 100 and the second wireless device 200 ⁇ may refer to the ⁇ wireless device 100x, the base station 200 ⁇ and / or the ⁇ wireless device 100x, the wireless device 100x of FIG. 13. ⁇ .
  • the first wireless device 100 includes one or more processors 102 and one or more memories 104, and may further include one or more transceivers 106 and / or one or more antennas 108.
  • the processor 102 controls the memory 104 and / or the transceiver 106 and may be configured to implement the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed herein.
  • the processor 102 may process the information in the memory 104 to generate the first information / signal, and then transmit the wireless signal including the first information / signal through the transceiver 106.
  • the processor 102 may receive the radio signal including the second information / signal through the transceiver 106 and store the information obtained from the signal processing of the second information / signal in the memory 104.
  • the memory 104 may be coupled to the processor 102 and may store various information related to the operation of the processor 102. For example, the memory 104 may perform instructions to perform some or all of the processes controlled by the processor 102 or to perform descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed herein. Can store software code that includes them.
  • processor 102 and memory 104 may be part of a communication modem / circuit / chip designed to implement wireless communication technology (eg, LTE, NR).
  • the transceiver 106 may be coupled to the processor 102 and may transmit and / or receive wireless signals via one or more antennas 108.
  • the transceiver 106 may include a transmitter and / or a receiver.
  • the transceiver 106 may be mixed with a radio frequency (RF) unit.
  • a wireless device may mean a communication modem / circuit / chip.
  • the second wireless device 200 may include one or more processors 202, one or more memories 204, and may further include one or more transceivers 206 and / or one or more antennas 208.
  • the processor 202 controls the memory 204 and / or the transceiver 206 and may be configured to implement the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed herein.
  • the processor 202 may process the information in the memory 204 to generate third information / signal, and then transmit the wireless signal including the third information / signal through the transceiver 206.
  • the processor 202 may receive the radio signal including the fourth information / signal through the transceiver 206 and then store information obtained from the signal processing of the fourth information / signal in the memory 204.
  • the memory 204 may be connected to the processor 202 and store various information related to the operation of the processor 202. For example, the memory 204 may perform instructions to perform some or all of the processes controlled by the processor 202 or to perform descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed herein. Can store software code that includes them.
  • processor 202 and memory 204 may be part of a communication modem / circuit / chip designed to implement wireless communication technology (eg, LTE, NR).
  • the transceiver 206 may be coupled with the processor 202 and may transmit and / or receive wireless signals via one or more antennas 208.
  • the transceiver 206 may include a transmitter and / or a receiver.
  • the transceiver 206 may be mixed with an RF unit.
  • a wireless device may mean a communication modem / circuit / chip.
  • One or more protocol layers may be implemented by one or more processors 102, 202, although not limited thereto.
  • one or more processors 102 and 202 may implement one or more layers (eg, functional layers such as PHY, MAC, RLC, PDCP, RRC, SDAP).
  • One or more processors 102, 202 may employ one or more Protocol Data Units (PDUs) and / or one or more Service Data Units (SDUs) in accordance with the descriptions, functions, procedures, suggestions, methods, and / or operational flowcharts disclosed herein. Can be generated.
  • PDUs Protocol Data Units
  • SDUs Service Data Units
  • One or more processors 102, 202 may generate messages, control information, data, or information in accordance with the descriptions, functions, procedures, suggestions, methods, and / or operational flowcharts disclosed herein.
  • One or more processors 102, 202 may generate signals (eg, baseband signals) including PDUs, SDUs, messages, control information, data or information in accordance with the functions, procedures, suggestions and / or methods disclosed herein.
  • signals eg, baseband signals
  • One or more processors 102, 202 may receive signals (eg, baseband signals) from one or more transceivers 106, 206, and include descriptions, functions, procedures, suggestions, methods, and / or operational flowcharts disclosed herein.
  • a PDU, an SDU, a message, control information, data, or information can be obtained.
  • One or more processors 102, 202 may be referred to as a controller, microcontroller, microprocessor, or microcomputer.
  • One or more processors 102, 202 may be implemented by hardware, firmware, software, or a combination thereof.
  • ASICs Application Specific Integrated Circuits
  • DSPs Digital Signal Processors
  • DSPDs Digital Signal Processing Devices
  • PLDs Programmable Logic Devices
  • FPGAs Field Programmable Gate Arrays
  • the descriptions, functions, procedures, suggestions, methods, and / or operational flowcharts disclosed herein may be implemented using firmware or software, and the firmware or software may be implemented to include modules, procedures, functions, and the like.
  • the descriptions, functions, procedures, suggestions, methods, and / or operational flowcharts disclosed herein may be included in one or more processors (102, 202) or stored in one or more memories (104, 204) of It may be driven by the above-described processor (102, 202).
  • the descriptions, functions, procedures, suggestions, methods, and / or operational flowcharts disclosed herein may be implemented using firmware or software in the form of code, instructions, and / or a set of instructions.
  • One or more memories 104, 204 may be coupled to one or more processors 102, 202 and may store various forms of data, signals, messages, information, programs, codes, instructions, and / or instructions.
  • One or more memories 104, 204 may be comprised of ROM, RAM, EPROM, flash memory, hard drive, registers, cache memory, computer readable storage medium, and / or combinations thereof.
  • One or more memories 104, 204 may be located inside and / or outside one or more processors 102, 202.
  • one or more memories 104, 204 may be coupled with one or more processors 102, 202 through various techniques, such as a wired or wireless connection.
  • One or more transceivers 106 and 206 may transmit user data, control information, wireless signals / channels, etc., as mentioned in the methods and / or operational flowcharts of this document, to one or more other devices.
  • One or more transceivers 106 and 206 may receive, from one or more other devices, user data, control information, wireless signals / channels, etc., as mentioned in the description, functions, procedures, suggestions, methods and / or operational flowcharts disclosed herein. have.
  • one or more transceivers 106 and 206 may be coupled with one or more processors 102 and 202 and may transmit and receive wireless signals.
  • one or more processors 102 and 202 may control one or more transceivers 106 and 206 to transmit user data, control information or wireless signals to one or more other devices.
  • one or more processors 102 and 202 may control one or more transceivers 106 and 206 to receive user data, control information or wireless signals from one or more other devices.
  • one or more transceivers 106, 206 may be coupled with one or more antennas 108, 208, and one or more transceivers 106, 206 may be connected to one or more antennas 108, 208 through the description, functions, and features disclosed herein.
  • one or more antennas may be a plurality of physical antennas or a plurality of logical antennas (eg, antenna ports).
  • One or more transceivers 106, 206 may process the received wireless signal / channel or the like in an RF band signal to process received user data, control information, wireless signals / channels, etc. using one or more processors 102,202.
  • the baseband signal can be converted.
  • One or more transceivers 106 and 206 may use the one or more processors 102 and 202 to convert processed user data, control information, wireless signals / channels, etc. from baseband signals to RF band signals.
  • one or more transceivers 106 and 206 may include (analog) oscillators and / or filters.
  • the wireless device 15 shows another example of a wireless device to which the present invention is applied.
  • the wireless device may be implemented in various forms depending on the use-example / service (see FIG. 13).
  • the wireless device 100, 200 corresponds to the wireless device 100, 200 of FIG. 18, and includes various elements, components, units / units, and / or modules. It can be configured as a module.
  • the wireless device 100, 200 may include a communication unit 110, a control unit 120, a memory unit 130, and additional elements 140.
  • the communication unit may include communication circuitry 112 and transceiver (s) 114.
  • the communication circuit 112 may include one or more processors 102, 202 and / or one or more memories 104, 204 of FIG. X1.
  • the transceiver (s) 114 may include one or more transceivers 106, 206 and / or one or more antennas 108, 208 of FIG.
  • the controller 120 is electrically connected to the communication unit 110, the memory unit 130, and the additional element 140, and controls various operations of the wireless device. For example, the controller 120 may control the electrical / mechanical operation of the wireless device based on the program / code / command / information stored in the memory unit 130. In addition, the control unit 120 transmits the information stored in the memory unit 130 to the outside (eg, other communication devices) through the communication unit 110 through a wireless / wired interface, or externally (eg, through the communication unit 110). Information received through a wireless / wired interface from another communication device) may be stored in the memory unit 130.
  • the outside eg, other communication devices
  • Information received through a wireless / wired interface from another communication device may be stored in the memory unit 130.
  • the additional element 140 may be configured in various ways depending on the type of wireless device.
  • the additional element 140 may include at least one of a power unit / battery, an I / O unit, a driver, and a computing unit.
  • the wireless device may be a robot (FIGS. W1, 100a), a vehicle (FIGS. W1, 100b-1, 100b-2), an XR device (FIGS. W1, 100c), a portable device (FIGS. W1, 100d), a home appliance (Fig. W1, 100e), IoT devices (Fig.
  • W1, 100f terminals for digital broadcasting, hologram devices, public safety devices, MTC devices, medical devices, fintech devices (or financial devices), security devices, climate / environment devices, It may be implemented in the form of an AI server / device (FIG. W1, 400), a base station (FIG. W1, 200), a network node, or the like.
  • the wireless device may be used in a mobile or fixed location depending on the usage-example / service.
  • various elements, components, units / units, and / or modules in the wireless device 100, 200 may be entirely interconnected through a wired interface, or at least a part of them may be wirelessly connected through the communication unit 110.
  • the control unit 120 and the communication unit 110 are connected by wire in the wireless device 100 or 200, and the control unit 120 and the first unit (eg, 130 and 140) are connected through the communication unit 110. It can be connected wirelessly.
  • each element, component, unit / unit, and / or module in wireless device 100, 200 may further include one or more elements.
  • the controller 120 may be composed of one or more processor sets.
  • the controller 120 may be configured as a set of a communication control processor, an application processor, an electronic control unit (ECU), a graphics processing processor, a memory control processor, and the like.
  • the memory unit 130 may include random access memory (RAM), dynamic RAM (DRAM), read only memory (ROM), flash memory, volatile memory, and non-volatile memory. volatile memory) and / or combinations thereof.
  • the vehicle or autonomous vehicle may be implemented as a mobile robot, a vehicle, a train, an aerial vehicle (AV), a ship, or the like.
  • AV aerial vehicle
  • a vehicle or an autonomous vehicle 100 may include an antenna unit 108, a communication unit 110, a control unit 120, a driving unit 140a, a power supply unit 140b, a sensor unit 140c, and autonomous driving. It may include a portion 140d.
  • the antenna unit 108 may be configured as part of the communication unit 110. Blocks 110/130 / 140a through 140d respectively correspond to blocks 110/130/140 in FIG.
  • the communication unit 110 may transmit and receive signals (eg, data, control signals, etc.) with other vehicles, a base station (e.g. base station, road side unit, etc.), a server, and other external devices.
  • the controller 120 may control various elements of the vehicle or the autonomous vehicle 100 to perform various operations.
  • the control unit 120 may include an electronic control unit (ECU).
  • the driving unit 140a may cause the vehicle or the autonomous vehicle 100 to travel on the ground.
  • the driver 140a may include an engine, a motor, a power train, wheels, a brake, a steering device, and the like.
  • the power supply unit 140b supplies power to the vehicle or the autonomous vehicle 100, and may include a wired / wireless charging circuit, a battery, and the like.
  • the sensor unit 140c may obtain vehicle status, surrounding environment information, user information, and the like.
  • the sensor unit 140c includes an inertial measurement unit (IMU) sensor, a collision sensor, a wheel sensor, a speed sensor, an inclination sensor, a weight sensor, a heading sensor, a position module, a vehicle forward / Reverse sensors, battery sensors, fuel sensors, tire sensors, steering sensors, temperature sensors, humidity sensors, ultrasonic sensors, illuminance sensors, pedal position sensors, and the like.
  • the autonomous driving unit 140d is a technology for maintaining a driving lane, a technology for automatically adjusting speed such as adaptive cruise control, a technology for automatically driving along a predetermined route, and automatically setting a route when a destination is set. Technology and the like.
  • the communication unit 110 may receive map data, traffic information data, and the like from an external server.
  • the autonomous driving unit 140d may generate an autonomous driving route and a driving plan based on the obtained data.
  • the controller 120 may control the driving unit 140a to move the vehicle or the autonomous vehicle 100 along the autonomous driving path according to the driving plan (eg, speed / direction adjustment).
  • the communication unit 110 may acquire the latest traffic information data aperiodically from an external server and may obtain the surrounding traffic information data from the surrounding vehicles.
  • the sensor unit 140c may acquire vehicle state and surrounding environment information.
  • the autonomous driving unit 140d may update the autonomous driving route and the driving plan based on the newly obtained data / information.
  • the communication unit 110 may transmit information regarding a vehicle location, an autonomous driving route, a driving plan, and the like to an external server.
  • the external server may predict traffic information data in advance using AI technology or the like based on information collected from the vehicle or autonomous vehicles, and provide the predicted traffic information data to the vehicle or autonomous vehicles.
  • embodiments of the present invention have been mainly described based on a signal transmission / reception relationship between a terminal and a base station. This transmission / reception relationship is extended to the same / similarly for signal transmission / reception between the terminal and the relay or the base station and the relay.
  • Certain operations described in this document as being performed by a base station may be performed by an upper node in some cases. That is, it is apparent that various operations performed for communication with the terminal in a network including 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 may be replaced by terms such as a fixed station, a Node B, an eNode B (eNB), an access point, and the like.
  • the terminal may be replaced with terms such as a user equipment (UE), a mobile station (MS), a mobile subscriber station (MSS), and the like.
  • the present invention can be used in a terminal, base station, or other equipment of a wireless mobile communication system.

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

Abstract

L'invention concerne un système de communication sans fil et, en particulier, un procédé et un appareil associés, le procédé consistant : à recevoir des informations de planification de liaison montante relatives à un canal partagé de liaison montante physique (PUSCH) ; à réaliser une procédure d'accès au canal (CAP) sur un symbole de départ candidat afin de transmettre le PUSCH ; et à commencer la transmission du PUSCH dans un symbole sur lequel la CAP a réussi, les informations de planification de liaison montante relatives au PUSCH contenant un symbole de début de transmission de PUSCH et un type de mappage de signal de référence de démodulation (DMRS), et le symbole de départ candidat étant déterminé comme étant au moins un symbole en fonction de la relation de position relative entre le symbole de début de transmission de PUSCH et un symbole sur lequel un DMRS est mappé.
PCT/KR2019/009766 2018-08-09 2019-08-06 Procédé d'émission ou de réception de signal dans un système de communication sans fil et appareil prenant en charge ce procédé WO2020032521A1 (fr)

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