WO2020060315A1 - Procédé pour procédure d'accès aléatoire pour un terminal dans un système de communication sans fil prenant en charge une bande sans licence, et dispositifs le prenant en charge - Google Patents

Procédé pour procédure d'accès aléatoire pour un terminal dans un système de communication sans fil prenant en charge une bande sans licence, et dispositifs le prenant en charge Download PDF

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Publication number
WO2020060315A1
WO2020060315A1 PCT/KR2019/012276 KR2019012276W WO2020060315A1 WO 2020060315 A1 WO2020060315 A1 WO 2020060315A1 KR 2019012276 W KR2019012276 W KR 2019012276W WO 2020060315 A1 WO2020060315 A1 WO 2020060315A1
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Prior art keywords
resource
prach
terminal
signal
random access
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PCT/KR2019/012276
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English (en)
Korean (ko)
Inventor
김선욱
고현수
안준기
양석철
윤석현
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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
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/34—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • 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 following description is for a wireless communication system, and relates to a method for random access of a terminal and devices supporting the same in a wireless communication system supporting an unlicensed band.
  • a wireless access system is a multiple access system that can support communication with multiple users by sharing available system resources (bandwidth, transmission power, etc.).
  • Examples of the multiple access system include a code division multiple access (CDMA) system, a frequency division multiple access (FDMA) system, a time division multiple access (TDMA) system, an orthogonal frequency division multiple access (OFDMA) system, and a single carrier frequency (SC-FDMA). division multiple access) system.
  • 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
  • an improved mobile broadband communication technology has been proposed compared to a conventional radio access technology (RAT).
  • RAT radio access technology
  • a communication system that considers services / UEs sensitive to reliability and latency as well as massive machine type communications (MTC) that provides a variety of services anytime, anywhere by connecting multiple devices and objects has been proposed.
  • MTC massive machine type communications
  • URLLC ultra-reliable and low latency communication
  • the purpose of this document is to provide an arbitrary access procedure method of a terminal and devices supporting the same in a wireless communication system supporting an unlicensed band.
  • This document discloses a method and a device supporting a random access procedure of a terminal in a wireless communication system supporting an unlicensed band.
  • one RA resource includes a plurality of physical random access channels (physical On the basis of including a random access channel (PRACH) opportunity (PRACH occasion; RO), a PRACH signal is transmitted through a specific RA resource among a plurality of RA resources on the unlicensed band, wherein the PRACH signal is (i) the specific A random access radio network temporary identifier determined based on a reference RO among a plurality of ROs included in the RA resource, or (ii) a combination of the plurality of ROs included in the specific RA resource. temporary identifier; transmitted based on RA-RNTI); And receiving, through the unlicensed band, a random access response (RAR) message scrambled with the RA-RNTI as a response to the PRACH signal.
  • RAR random access response
  • the RA-RNTI may be determined based on a parameter having an integer value from 0 to 7.
  • the parameter may have (i) a value assigned to the reference RO among the plurality of ROs included in the specific RA resource, or (ii) the plurality of the RAs included in the specific RA resource. It may have a value assigned to a combination of ROs.
  • the reference RO among the plurality of ROs may correspond to one of the following.
  • the RAR message may include PRACH index information related to the PRACH signal.
  • the PRACH index information includes: (i) one of the plurality of ROs included in the specific RA resource. It may include the first index information related to the PRACH preamble transmitted in, or (ii) the second index information related to the set of PRACH preambles for each RO included in the specific RA resource.
  • the specific RA resource includes (i) a reference signal received power (RSRP) of a corresponding synchronization signal / physical broadcast channel (SS / PBCH) block. , Or, (ii) may be determined based on the number of retransmissions of the PRACH preamble.
  • RSRP reference signal received power
  • the specific RA resource among the plurality of RA resources is determined based on the RSRP of the corresponding SS / PBCH block, the specific RA resource includes a larger number of ROs as the RSRP value is smaller. Can be determined as an RA resource.
  • the specific RA resource among the plurality of RA resources is determined based on the number of retransmissions of the PRACH preamble
  • the specific RA resource includes more ROs as the number of retransmissions of the PRACH preamble increases.
  • the terminal When the terminal transmits the PRACH signal through a specific RA resource among a plurality of RA resources on the unlicensed band, the terminal is based on a channel access procedure (CAP) for the specific RA resource. It may include transmitting the PRACH signal through a specific RA resource among a plurality of RA resources on the unlicensed band.
  • CAP channel access procedure
  • the terminal may additionally perform the following operations.
  • PUSCH physical uplink shared channel
  • the RA procedure Consider resolution is considered a success
  • a terminal performing a random access (RA) procedure in a wireless communication system supporting an unlicensed band comprising: at least one transmitter; At least one receiver; At least one processor; And at least one memory operatively connected to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform a particular operation.
  • the specific operation may include the following operation.
  • -One RA resource is based on including a plurality of physical random access channel (PRACH occasion; RO), PRACH signal through a specific RA resource among a plurality of RA resources on the unlicensed band But the PRACH signal is based on (i) a reference RO among a plurality of ROs included in the specific RA resource, or (ii) a combination of the plurality of ROs included in the specific RA resource. Transmitted based on the determined random access-radio network temporary identifier (RA-RNTI)
  • RA-RNTI random access-radio network temporary identifier
  • RA-RNTI a random access response (RAR) message scrambled with the RA-RNTI is received through the unlicensed band.
  • RAR random access response
  • the terminal may communicate with at least one of a mobile terminal, a network, and an autonomous vehicle other than a vehicle including the terminal.
  • a base station supporting a random access (random access; RA) procedure of a terminal in a wireless communication system supporting an unlicensed band comprising: at least one transmitter; At least one receiver; At least one processor; And at least one memory operatively connected to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform a particular operation.
  • the specific operation may include the following operation.
  • -One RA resource is based on including a plurality of physical random access channel (PRACH occasion) (PRACH occasion; RO), a specific RA resource among a plurality of RA resources on the unlicensed band from the terminal
  • PRACH occasion PRACH occasion
  • RO physical random access channel
  • a PRACH signal is received through the PRACH signal, (i) a reference RO among a plurality of ROs included in the specific RA resource, or (ii) a combination of the plurality of ROs included in the specific RA resource.
  • RA-RNTI random access-radio network temporary identifier
  • a random access response (RAR) message scrambled with the RA-RNTI is transmitted to the terminal through the unlicensed band.
  • the UE may transmit a PRACH preamble that satisfies Power Spectrum Density (PSD) regulation of an unlicensed band.
  • PSD Power Spectrum Density
  • the base station can receive the corresponding signal with a greater complexity than the existing one (despite receiving the PRACH preamble through multiple ROs).
  • 1 is a view for explaining a physical channel and a signal transmission method using them.
  • FIGS. 2 and 3 are diagrams illustrating a radio frame structure based on the LTE system to which the examples of the present disclosure are applicable.
  • FIG. 4 is a diagram showing a slot structure based on the LTE system to which the examples of the present disclosure are applicable.
  • FIG. 5 is a diagram showing the structure of a downlink subframe based on the LTE system to which the examples of the present disclosure are applicable.
  • FIG. 6 is a diagram showing the structure of an uplink subframe based on the LTE system to which the examples of the present disclosure are applicable.
  • FIG. 7 is a diagram illustrating a structure of a radio frame based on an NR system to which the examples of the present disclosure are applicable.
  • FIG. 8 is a view showing a slot structure based on the NR system to which the examples of the present disclosure are applicable.
  • FIG. 9 is a diagram showing a self-contained slot structure applicable to the examples of the present description.
  • FIG. 10 is a view showing one REG structure based on the NR system to which the examples of the present disclosure are applicable.
  • 11 and 12 are views illustrating a typical connection scheme between a TXRU and an antenna element.
  • FIG. 13 is a diagram briefly showing a hybrid beamforming structure in terms of a TXRU and a physical antenna applicable to the examples of the present description.
  • FIG. 14 is a diagram briefly showing a beam sweeping operation for a synchronization signal and system information in a downlink (DL) transmission process according to examples of the present disclosure.
  • 15 is a diagram briefly showing an SS / PBCH block applicable to the examples of the present description.
  • 16 is a diagram briefly showing a configuration in which an SS / PBCH block applicable to the examples of the present description is transmitted.
  • FIG. 17 is a diagram showing the RRC state and the RRC state transition (transition) of the terminal
  • FIG. 18 is the NR / NGC (NR / Next Gen Core) and E-UTRAN / EPC (Evolved) as well as the RRC state and RRC state switching of the terminal -This is a diagram showing the mobility procedure supported between Universal Terrestrial Radio Access Network / Evolved Packet Core.
  • 19 is a diagram showing a DRX cycle of a terminal applicable to the examples of the present description
  • FIG. 20 shows an example of a wireless communication system supporting an unlicensed band applicable to the examples of the present description.
  • 21 is a diagram for describing a CAP for unlicensed band transmission applicable to the examples of the present description.
  • FIG. 22 is a diagram illustrating a partial TTI (partial TTI) or a partial subframe / slot applicable to the examples of the present description.
  • 23 is a view simply showing a random access procedure applicable to the examples of the present disclosure.
  • 24 is a diagram showing an example of a PRACH format composed of a length 139 sequence.
  • 25 to 30 are diagrams showing examples of interlaced PRACH configurations proposed in the examples of the present description.
  • 31 is a diagram illustrating an example in which a plurality of RACH occasions are configured in a frequency domain.
  • FIG. 32 is a diagram showing an example of an operation of a terminal (UE) and a base station (BS) disclosed in this document
  • FIG. 33 is a flowchart of an operation of a terminal according to an example disclosed in this document
  • FIG. It is an operation flowchart of a base station according to an example.
  • 35 illustrates a communication system applied to the examples of this disclosure.
  • 39 illustrates a vehicle or autonomous vehicle applied to the examples of the present description.
  • each component or feature can be considered to be optional unless stated otherwise.
  • Each component or feature may be implemented in a form that is not combined with other components or features.
  • some components and / or features may be combined to form examples of the present description. The order of the operations described in the examples of this description can be changed. Some configurations or features of one embodiment may be included in other embodiments, or may be replaced with corresponding configurations or features of other embodiments.
  • the base station has a meaning as a terminal node of a network that directly communicates with a mobile station. Certain operations described in this document as being performed by a base station may be performed by an upper node of the base station in some cases.
  • various operations performed for communication with a mobile station in a network composed of a plurality of network nodes including a base station may be performed by a base station or other network nodes other than the base station.
  • the 'base station' may be replaced by terms such as a fixed station, Node B, eNode B (eNB), gNode B (gNB), advanced base station (ABS), or access point. You can.
  • a terminal is a user equipment (UE), a mobile station (MS), a subscriber station (SS), a mobile subscriber station (MSS), It may be replaced with terms such as a mobile terminal or an advanced mobile station (AMS).
  • UE user equipment
  • MS mobile station
  • SS subscriber station
  • MSS mobile subscriber station
  • AMS advanced mobile station
  • the transmitting end refers to a fixed and / or mobile node that provides a data service or a voice service
  • the receiving end refers to a fixed and / or mobile node that receives a data service or a voice service. Therefore, in the uplink, a mobile station can be a transmitting end and a base station can be a receiving end. Likewise, in the downlink, a mobile station can be a receiving end, and a base station can be a transmitting end.
  • the examples of the present description may be supported by standard documents disclosed in at least one of wireless access systems, IEEE 802.xx system, 3rd Generation Partnership Project (3GPP) system, 3GPP LTE system, 3GPP 5G NR system and 3GPP2 system,
  • 3GPP NR system as well as a 3GPP LTE / LTE-A system will be described as an example of a radio access system in which the examples of the present disclosure can be used.
  • 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 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 with wireless technologies such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, and Evolved UTRA (E-UTRA).
  • UTRA is part of the Universal Mobile Telecommunications System (UMTS).
  • 3GPP Long Term Evolution (LTE) is part of Evolved UMTS (E-UMTS) that uses E-UTRA, and adopts OFDMA in the downlink and SC-FDMA in the uplink.
  • LTE-A (Advanced) system is an improved 3GPP LTE system.
  • the examples of the present description mainly describe the 3GPP NR system as well as the 3GPP LTE / LTE-A system, but can be applied to the IEEE 802.16e / m system and the like.
  • a user equipment receives information from a base station through downlink (DL) and transmits information to a base station through uplink (UL).
  • the information transmitted and received by the base station and the terminal includes general data information and various control information, and various physical channels exist according to the type / use of the information they transmit and receive.
  • 1 is a view for explaining a physical channel that can be used in the examples of the present description and a signal transmission method using them.
  • the terminal When the power is turned off again when the power is turned off, or the newly entered cell performs an initial cell search operation such as synchronizing with the base station (S11).
  • the terminal receives a primary synchronization channel (P-SCH: Primary Synchronization Channel) and a floating channel (S-SCH: Secondary Synchronization Channel) from the base station, synchronizes with the base station, and acquires information such as a cell ID.
  • P-SCH Primary Synchronization Channel
  • S-SCH Secondary Synchronization Channel
  • the terminal may receive a physical broadcast channel (PBCH) signal from the base station to obtain intra-cell broadcast information.
  • PBCH physical broadcast channel
  • the UE may check a downlink channel state by receiving a downlink reference signal (DL RS) in an initial cell search step.
  • DL RS downlink reference signal
  • the UE After completing the initial cell search, the UE receives a physical downlink control channel (PDCCH) and a physical downlink control channel (PDSCH) according to the information on the physical downlink control channel, and thus more detailed system information. Can be obtained (S12).
  • a physical downlink control channel (PDCCH)
  • a physical downlink control channel (PDSCH)
  • the terminal may perform a random access procedure (Random Access Procedure) to complete the access to the base station (S13 ⁇ S16).
  • the UE transmits a preamble through a physical random access channel (PRACH) (S13), and RAR for the preamble through a physical downlink control channel and a corresponding physical downlink shared channel ( Random Access Response) may be received (S14).
  • the UE transmits a PUSCH (Physical Uplink Shared Channel) using scheduling information in the RAR (S15), and a collision resolution procedure such as reception of a physical downlink control channel signal and a corresponding physical downlink shared channel signal (Contention Resolution Procedure) ) Can be performed (S16).
  • PUSCH Physical Uplink Shared Channel
  • Contention Resolution Procedure Contention Resolution Procedure
  • the UE After performing the above-described procedure, the UE receives the physical downlink control channel signal and / or the physical downlink shared channel signal (S17) and the physical uplink shared channel (PUSCH) as a general uplink / downlink signal transmission procedure.
  • the Uplink Shared Channel (PUCCH) signal and / or the Physical Uplink Control Channel (PUCCH) signal may be transmitted (S18).
  • UCI uplink control information
  • UCI includes HARQ-ACK / NACK (Hybrid Automatic Repeat and reQuest Acknowledgement / Negative-ACK), SR (Scheduling Request), CQI (Channel Quality Indication), PMI (Precoding Matrix Indication), RI (Rank Indication) information, etc. .
  • UCI is generally periodically transmitted through PUCCH, but can be transmitted through PUSCH when control information and data should be simultaneously transmitted.
  • the UE may periodically transmit UCI through PUSCH.
  • FIGS. 2 and 3 are diagrams illustrating a radio frame structure based on the LTE system to which the examples of the present disclosure are applicable.
  • the LTE system supports frame type 1 for frequency division duplex (FDD), frame type 2 for time division duplex (TDD), and frame type 3 for unlicensed cell (UCell).
  • FDD frequency division duplex
  • TDD time division duplex
  • Uell unlicensed cell
  • PCell primary cell
  • SCells secondary cells
  • the operation described below can be applied independently for each cell.
  • time resources eg, subframes, slots, and subslots
  • TU time unit
  • Figure 2 (a) shows a type 1 frame structure (frame structure type 1).
  • the type 1 frame structure may be applied to both a full duplex (Frequency Division Duplex) system and a half duplex (FDD) system.
  • FDD Frequency Division Duplex
  • the downlink radio frame is defined as 10 1ms subframes (Subframes, SFs).
  • the subframe includes 14 or 12 symbols depending on the cyclic prefix (CP).
  • CP cyclic prefix
  • the symbol may mean an OFDM (A) symbol or an SC-FDM (A) symbol according to multiple access schemes.
  • the symbol may mean an OFDM (A) symbol in the downlink and an SC-FDM (A) symbol in the uplink.
  • the OFDM (A) symbol is referred to as a CP-OFDM (A) (Cyclic Prefix-OFDM (A)) symbol
  • the SC-FDM (A) symbol is DFT-s-OFDM (A) (Discrete Fourier Transform-spread-OFDM). (A)) may be referred to as a symbol.
  • One subframe may be defined as one or more slots as follows according to SCS (Subcarrier Spacing).
  • subframe #i is defined as one 1ms slot # 2i.
  • subframe #i may be defined as six subslots as illustrated in Table 1.
  • Table 1 illustrates a subslot configuration in one subframe (normally CP).
  • FIG. 2 (b) shows a frame structure type 2.
  • the type 2 frame structure is applied to the TDD system.
  • the type 2 frame structure is composed of two half frames.
  • the half frame includes 4 (or 5) general subframes and 1 (or 0) special subframes.
  • the general subframe is used for uplink or downlink according to UL-DL configuration (Uplink-Downlink Configuration).
  • the subframe consists of two slots.
  • Table 2 illustrates a subframe configuration in a radio frame according to the UL-DL configuration.
  • D represents a DL subframe
  • U represents a UL subframe
  • S represents a special (special) subframe.
  • the special subframe includes a downlink pilot time slot (DwPTS), a guard period (GP), and an uplink pilot time slot (UpPTS).
  • DwPTS is used for initial cell search, synchronization, or channel estimation at the UE.
  • UpPTS is used to match channel estimation at the base station and uplink transmission synchronization of the terminal.
  • the guard period is a period for removing interference generated in the uplink due to multipath delay of the downlink signal between the uplink and the downlink.
  • Table 3 illustrates the configuration of the special subframe.
  • X is set by higher layer signaling (eg, Radio Resource Control (RRC) signaling, etc.), or is given as 0.
  • RRC Radio Resource Control
  • FIG. 3 is a diagram illustrating a frame structure type 3
  • Frame structure type 3 may be applied to UCell operation. Although not limited to this, the frame structure type 3 can be applied only to the operation of a Licensed Assisted Access (LAA) SCell having a normal CP.
  • the frame has a length of 10 ms, and is defined as 10 1 ms subframes.
  • Subframe #i is defined by two consecutive slots # 2i and # 2i + 1.
  • Each subframe in the frame may be used for downlink or uplink transmission, or may be empty.
  • Downlink transmission occupies one or more consecutive subframes (occupy), starts at an arbitrary point in the subframe and ends at a subframe boundary or DwPTS of Table 3.
  • Uplink transmission occupies one or more consecutive subframes.
  • FIG. 4 is a diagram showing a slot structure based on the LTE system to which the examples of the present disclosure are applicable.
  • one slot includes a plurality of OFDM symbols in a time domain and a plurality of resource blocks (RBs) in a frequency domain.
  • the symbol also means a symbol period.
  • the structure of the slot may be represented by a resource grid composed of N DL / UL RB ⁇ N RB sc subcarriers and N DL / UL symb symbols.
  • N DL RB indicates the number of RBs in the downlink slot
  • N UL RB indicates the number of RBs in the UL slot.
  • N DL RB and N UL RB depend on the DL bandwidth and the UL bandwidth, respectively.
  • N DL symb represents the number of symbols in the DL slot
  • N UL symb represents the number of symbols in the UL slot
  • N RB sc represents the number of subcarriers constituting RB.
  • the number of symbols in the slot can be variously changed according to the SCS and CP lengths (see Table 1). For example, in the case of a normal CP, one slot includes 7 symbols, but in the case of an extended CP, one slot includes 6 symbols.
  • RB is defined as N DL / UL symb (e.g., 7) consecutive symbols in the time domain, and N RB sc (e.g., 12) consecutive subcarriers in the frequency domain.
  • RB may mean PRB (Physical Resource Block) or VRB (Virtual Resource Block), and PRB and VRB may be mapped on a one-to-one basis.
  • PRB Physical Resource Block
  • VRB Virtual Resource Block
  • Two RBs, one for each of the two slots of the subframe, may be referred to as an RB pair.
  • the two RBs constituting the RB pair may have the same RB number (or RB index).
  • a resource composed of one symbol and one subcarrier is called a resource element (RE) or tone.
  • RE resource element
  • Each RE in the resource grid can be uniquely defined by an index pair (k, l) in the slot.
  • k is an index assigned from 0 to N DL / UL RB ⁇ N RB sc -1 in the frequency domain
  • l is an index assigned from 0 to N DL / UL symb -1 in the time domain.
  • FIG. 5 is a diagram showing the structure of a downlink subframe based on the LTE system to which the examples of the present disclosure are applicable.
  • OFDM (A) symbols located in front of the first slot in a subframe correspond to a control region to which a downlink control channel is allocated.
  • the remaining OFDM (A) symbol corresponds to a data region to which PDSCH is allocated, and the basic resource unit of the data region is RB.
  • the downlink control channel includes a Physical Control Format Indicator Channel (PCFICH), a Physical Downlink Control Channel (PDCCH), and a Physical Hybrid-ARQ Indicator Channel (PHICH).
  • PCFICH Physical Control Format Indicator Channel
  • PDCCH Physical Downlink Control Channel
  • PHICH Physical Hybrid-ARQ Indicator Channel
  • the PCFICH is transmitted in the first OFDM symbol of the subframe, and carries information about the number of OFDM symbols (that is, the size of the control region) used for transmission of control channels in the subframe.
  • PHICH is a response channel for uplink transmission, and carries a hybrid automatic repeat request (HARQ) acknowledgment (ACK) / negative-acknowledgement (NACK) signal.
  • HARQ hybrid automatic repeat request
  • ACK acknowledgment
  • NACK negative-acknowledgement
  • Control information transmitted through the PDCCH is referred to as downlink control information (DCI).
  • the DCI includes uplink resource allocation information, downlink resource allocation information, or an uplink transmission (Tx) power control command for an arbitrary UE group.
  • FIG. 6 is a diagram showing the structure of an uplink subframe based on the LTE system to which the examples of the present disclosure are applicable.
  • one subframe 600 is composed of two 0.5ms slots 601. Each slot consists of a plurality of symbols 602, and one symbol corresponds to one SC-FDMA symbol.
  • the RB 603 is a resource allocation unit corresponding to 12 subcarriers in the frequency domain and one slot in the time domain.
  • the structure of the uplink subframe is largely divided into a data area 604 and a control area 605.
  • the data area refers to a communication resource used in transmitting data such as voice and packets transmitted from each terminal and includes a physical uplink shared channel (PUSCH).
  • the control region refers to a communication resource used to transmit an uplink control signal, for example, a downlink channel quality report from each terminal, a reception ACK / NACK for a downlink signal, an uplink scheduling request, and the like, and a PUCCH (Physical Uplink). Control Channel).
  • SRS Sounding Reference Signal
  • FIG. 7 is a diagram illustrating a structure of a radio frame based on an NR system to which the examples of the present disclosure are applicable.
  • Uplink and downlink transmission based on the NR system is based on a frame as shown in FIG. 7.
  • 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 5 1ms subframes (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). Normally, if CP is used, each slot contains 14 symbols.
  • each slot includes 12 symbols.
  • the symbol may include an OFDM symbol (or CP-OFDM symbol) and an SC-FDMA symbol (or DFT-s-OFDM symbol).
  • Table 4 shows the number of symbols per slot according to the SCS, the number of slots per frame, and the number of slots per subframe when the normal CP is used
  • Table 5 shows the slot number according to the SCS when the extended CSP is used. It indicates the number of symbols, the number of slots per frame, and the number of slots per subframe.
  • N slot symb indicates the number of symbols in the slot
  • N frame indicates the number of slots in the frame
  • ⁇ slot indicates the number of slots in the frame
  • N subframe indicates the number of slots in the subframe
  • OFDM (A) numerology eg, SCS, CP length, etc.
  • a numerology eg, SCS, CP length, etc.
  • a (absolute time) section of a time resource eg, SF, slot, or TTI
  • a time unit TU
  • FIG. 8 is a view showing a slot structure based on the NR system to which the examples of the present disclosure are applicable.
  • One slot includes a plurality of symbols in the time domain. For example, in the case of a normal CP, one slot includes 7 symbols, but in the case of an extended CP, one slot includes 6 symbols.
  • the carrier includes a plurality of subcarriers in the frequency domain.
  • RB Resource Block
  • RB Resource Block
  • BWP Bandwidth Part
  • P contiguous
  • CP Physical channels
  • the carrier may include up to N (eg, 5) BWPs. Data communication is performed through the activated BWP, and only one BWP can be activated for one terminal.
  • N e.g. 5
  • Each element in the resource grid is referred to as a resource element (RE), and one complex symbol may be mapped.
  • RE resource element
  • FIG. 9 is a diagram showing a self-contained slot structure based on the NR system to which the examples of the present disclosure are applicable.
  • the base station and the UE can sequentially perform DL transmission and UL transmission in one slot, and can transmit and receive DL data and transmit and receive UL ACK / NACK therein in one slot.
  • such a structure reduces the time it takes to retransmit data when a data transmission error occurs, thereby minimizing the delay in the final data transmission.
  • a type gap of a certain time length is required for a base station and a UE to switch from a transmission mode to a reception mode or to switch from a reception mode to a transmission mode.
  • some OFDM symbols at a time point of switching from DL to UL in an independent slot structure may be set as a guard period (GP).
  • the independent slot structure includes both the DL control area and the UL control area has been described, but the control areas may be selectively included in the independent slot structure.
  • the self-supporting slot structure applicable to the examples of the present disclosure may include a case in which only the DL control area or the UL control area is included as well as the case where both the DL control area and the UL control area are included as shown in FIG. 9.
  • one slot may be configured in the order of DL control area / DL data area / UL control area / UL data area, or may be configured in the order of UL control area / UL data area / DL control area / DL data area.
  • 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.
  • downlink control information for example, DL data scheduling information, UL data scheduling information, and the like may be transmitted.
  • uplink control information for example, ACK / NACK (Positive Acknowledgement / Negative Acknowledgement) information for DL data, CSI (Channel State Information) information, and SR (Scheduling Request) may be transmitted.
  • PDSCH carries downlink data (eg, DL-shared channel transport block, DL-SCH TB), and modulation methods such as Quadrature Phase Shift Keying (QPSK), 16 Quadrature Amplitude Modulation (QAMK), 64 QAM, and 256 QAM are used. Applies.
  • a codeword is generated by encoding TB.
  • PDSCH can carry up to two codewords. For each codeword, scrambling and modulation mapping are performed, and modulation symbols generated from each codeword are mapped to one or more layers (Layer mapping). Each layer is mapped to a resource together with a DMRS (Demodulation Reference Signal) and is generated as an OFDM symbol signal and transmitted through a corresponding antenna port.
  • DMRS Demodulation Reference Signal
  • the PDCCH carries downlink control information (DCI) and a QPSK modulation method is applied.
  • DCI downlink control information
  • One PDCCH is composed of 1, 2, 4, 8 and 16 control channel elements (CCEs) according to an aggregation level (AL).
  • CCE is composed of six Resource Element Groups (REGs).
  • REG is defined by one OFDM symbol and one (P) RB.
  • FIG. 10 is a view showing one REG structure based on the NR system to which the examples of the present disclosure are applicable.
  • D represents a resource element (RE) to which DCI is mapped
  • R represents a RE to which DMRS is mapped.
  • DMRS is mapped to the 1st, 5th, and 9th REs in the frequency domain direction within one symbol.
  • CORESET Control Resource Set
  • CORESET is defined as a set of REGs with a given pneumonology (eg, SCS, CP length, etc.). Multiple OCRESETs for one UE may overlap in the time / frequency domain.
  • CORESET may be set through system information (eg, MIB) or UE-specific upper layer (eg, Radio Resource Control, RRC, layer) signaling. Specifically, the number of RBs and the number of symbols (up to 3) constituting the CORESET may be set by higher layer signaling.
  • PUSCH carries uplink data (eg, UL-shared channel transport block, UL-SCH TB) and / or uplink control information (UCI), and CP-OFDM (Cyclic Prefix-Orthogonal Frequency Division Multiplexing) waveform Or it is transmitted based on a DFT-s-OFDM (Discrete Fourier Transform-spread-Orthogonal Frequency Division Multiplexing) waveform.
  • DFT-s-OFDM Discrete Fourier Transform-spread-Orthogonal Frequency Division Multiplexing
  • PUSCH may be transmitted based on a waveform or a DFT-s-OFDM waveform.
  • PUSCH transmission is dynamically scheduled by UL grant in DCI, or semi-static based on upper layer (eg, RRC) signaling (and / or Layer 1 (L1) signaling (eg, PDCCH)). Can be scheduled (configured grant).
  • PUSCH transmission may be performed on a codebook basis or a non-codebook basis.
  • PUCCH carries uplink control information, HARQ-ACK and / or scheduling request (SR), and is divided into Short PUCCH and Long PUCCH according to the PUCCH transmission length.
  • Table 6 illustrates PUCCH formats.
  • PUCCH format 0 carries UCI up to 2 bits in size, and is mapped and transmitted based on a sequence. Specifically, the terminal transmits a specific UCI to the base station by transmitting one sequence among a plurality of sequences through PUCCH in PUCCH format 0. The UE transmits a PUCCH in PUCCH format 0 in PUCCH resource for setting a corresponding SR only when transmitting a positive SR.
  • PUCCH format 1 carries UCI with a size of up to 2 bits, and the modulation symbol is spread in the time domain by an orthogonal cover code (OCC) (which is set differently depending on whether frequency hopping is performed).
  • OCC orthogonal cover code
  • DMRS is transmitted on a symbol in which a modulation symbol is not transmitted (ie, time division multiplexing (TDM)).
  • PUCCH format 2 carries UCI having a bit size larger than 2 bits, and the modulation symbol is transmitted through DMRS and Frequency Division Multiplexing (FDM).
  • DM-RS is located at symbol indices # 1, # 4, # 7, and # 10 in a given resource block at a density of 1/3.
  • PN Pulseudo Noise sequence is used for the DM_RS sequence.
  • frequency hopping may be activated.
  • PUCCH format 3 does not allow terminal multiplexing in the same physical resource blocks, and carries a UCI having a bit size larger than 2 bits.
  • PUCCH resources in PUCCH format 3 do not include orthogonal cover codes.
  • the modulation symbol is transmitted through DMRS and Time Division Multiplexing (TDM).
  • PUCCH format 4 supports multiplexing up to 4 UEs in the same physical resource block, and carries a UCI having a bit size larger than 2 bits.
  • the PUCCH resource of PUCCH format 3 includes an orthogonal cover code.
  • the modulation symbol is transmitted through DMRS and Time Division Multiplexing (TDM).
  • the millimeter wave (mmW) has a short wavelength, so multiple antenna elements can be installed in the same area. That is, since the wavelength is 1 cm in the 30 GHz band, a total of 100 antenna elements can be installed in a 2-dimension arrangement in 0.5 lambda (wavelength) intervals on a 5 * 5 cm panel. Accordingly, in millimeter wave (mmW), a plurality of antenna elements may be used to increase beamforming (BF) gain to increase coverage or increase throughput.
  • BF beamforming
  • each antenna element may include a TXRU (Transceiver Unit) so that transmission power and phase can be adjusted for each antenna element.
  • TXRU Transceiver Unit
  • each antenna element can perform independent beamforming for each frequency resource.
  • hybrid beamforming having B TXRUs, which is less than Q antenna elements, may be considered as an intermediate form between digital beamforming and analog beamforming.
  • hybrid beamforming hybrid BF
  • B TXRUs which is less than Q antenna elements
  • the direction of beams that can be simultaneously transmitted may be limited to B or less.
  • FIG 11 and 12 are views illustrating a typical connection scheme between a TXRU and an antenna element.
  • the TXRU virtualization model shows the relationship between the output signal of the TXRU and the output signal of the antenna element.
  • FIG. 11 is a diagram illustrating how a TXRU is connected to a sub-array. 11, the antenna element is connected to only one TXRU.
  • Figure 12 is a diagram showing how the TXRU is connected to all antenna elements.
  • the antenna element is connected to all TXRUs.
  • a separate adder is required as shown in FIG. 12 so that the antenna elements are connected to all TXRUs.
  • W represents a phase vector multiplied by an analog phase shifter. That is, W is a main parameter that determines the direction of analog beamforming.
  • the mapping between the CSI-RS antenna port and the TXRUs may be 1: 1 or 1: 1-to-many.
  • analog beamforming refers to an operation of performing precoding (or combining) in an RF stage.
  • baseband and RF stages perform precoding (or combining), respectively. This has the advantage of reducing the number of RF chains and digital-to-analog (D / A) (or analog-to-digital (A / D)) converters, while still achieving close performance to digital beamforming.
  • the hybrid beamforming structure may be represented by N transmit / receiver units (TXRU) and M physical antennas.
  • digital beamforming for the L data layers to be transmitted by the transmitting end may be represented by an N * L (N by L) matrix.
  • the converted N digital signals are converted to analog signals through TXRU, and analog beamforming represented by an M * N (M by N) matrix is applied to the converted signals.
  • FIG. 13 is a diagram briefly showing a hybrid beamforming structure in terms of a TXRU and a physical antenna applicable to the examples of the present description.
  • the number of digital beams in FIG. 13 is L
  • the number of analog beams is N.
  • a method for supporting a more efficient beamforming to a terminal located in a specific area is considered by designing a base station to change analog beamforming in a symbol unit. Furthermore, when defining certain N TXRUs and M RF antennas as one antenna panel as shown in FIG. 13, in the NR system according to the examples of the present disclosure, hybrid beamforming independent of each other may be applied. Even a method of introducing an antenna panel is being considered.
  • the analog beams advantageous for signal reception may be different for each terminal. Accordingly, in an NR system to which the examples of the present disclosure can be applied, a base station applies a different analog beam for each symbol in a specific subframe (SF) or slot (at least a synchronization signal, system information, paging, etc.) to transmit a signal. By doing so, a beam sweeping operation that allows all terminals to have a reception opportunity is considered.
  • SF subframe
  • slot at least a synchronization signal, system information, paging, etc.
  • FIG. 14 is a diagram briefly showing a beam sweeping operation for a synchronization signal and system information in a downlink (DL) transmission process according to examples of the present disclosure.
  • a physical resource (or physical channel) in which system information of an NR system to which the examples of the present disclosure are applicable is transmitted in a broadcasting method is referred to as a physical broadcast channel (xPBCH).
  • xPBCH physical broadcast channel
  • a reference signal transmitted by applying a single analog beam (corresponding to a specific antenna panel) as a configuration for measuring a channel for each analog beam (Reference) signal, RS), the introduction of beam reference signals (Beam RS, BRS) is being discussed.
  • the BRS may be defined for a plurality of antenna ports, and each antenna port of the BRS may correspond to a single analog beam.
  • the synchronization signal or the xPBCH may be transmitted by applying all analog beams in the analog beam group so that any UE can receive it well.
  • Synchronization Signal Block (SSB or SS / PBCH block)
  • a primary synchronization signal PSS
  • SSS secondary synchronization signal
  • PSBCH physical broadcast channel
  • the SS / PBCH block may be transmitted in a band other than the center of the system band, and in particular, when the base station supports broadband operation, the base station may transmit multiple SS / PBCH blocks.
  • 15 is a diagram briefly showing an SS / PBCH block applicable to the examples of the present description.
  • the SS / PBCH block applicable to the examples of the present description may be composed of 20 RBs in 4 consecutive OFDM symbols.
  • the SS / PBCH block is composed of PSS, SSS, and PBCH, and the UE can perform cell search, system information acquisition, beam alignment for initial access, DL measurement, etc. based on the SS / PBCH block. .
  • PSS and SSS are each composed of 1 OFDM symbol and 127 subcarriers
  • PBCH is composed of 3 OFDM symbols and 576 subcarriers.
  • Polar coding and quadrature phase shift keying (QPSK) are applied to the PBCH.
  • the PBCH is composed of a data RE and a DMRS (Demodulation Reference Signal) RE for each OFDM symbol.
  • DMRS Demodulation Reference Signal
  • the location of the DMRS RE may be determined based on the cell ID (eg, a subcarrier index mapped based on the N cell ID mod 4 value may be determined).
  • the SS / PBCH block may be transmitted in a frequency band other than the center frequency of the frequency band used by the network.
  • a synchronization raster which is a candidate frequency location for which the terminal should detect an SS / PBCH block.
  • the synchronous raster can be distinguished from a channel raster.
  • the synchronous raster may indicate the frequency location of the SS / PBCH block that the UE can use to acquire system information when there is no explicit signaling for the SS / PBCH block location.
  • the synchronization raster may be determined based on GSCN (Global Synchronization Channel Number).
  • the GSCN may be transmitted through RRC signaling (eg, Master Information Block (MIB), System Information Block (SIB), Remaining Minimum System Information (RMSI), Other System Information (OSI), etc.).
  • RRC signaling eg, Master Information Block (MIB), System Information Block (SIB), Remaining Minimum System Information (RMSI), Other System Information (OSI), etc.
  • Such a synchronous raster is defined longer in the frequency axis than the channel raster in consideration of the complexity and detection speed of the initial synchronization and has fewer blind detections.
  • 16 is a diagram briefly showing a configuration in which an SS / PBCH block applicable to the examples of the present description is transmitted.
  • the base station may transmit the SS / PBCH block up to 64 times for 5 ms.
  • a plurality of SS / PBCH blocks are transmitted with different transmission beams, and the UE detects the SS / PBCH block by assuming that the SS / PBCH block is transmitted every 20 ms period based on a specific one beam used for transmission. can do.
  • the maximum number of beams that a base station can use for SS / PBCH block transmission within a 5 ms time interval can be set as the frequency band is higher.
  • the base station can transmit SS / PBCH blocks using up to four different beams in a 5 ms time interval, up to eight in a 3-6 GHz band, and up to 64 different beams in a band above 6 GHz.
  • the terminal may perform synchronization by receiving the above SS / PBCH block from the base station.
  • the synchronization procedure largely includes a cell ID detection step and a timing detection step.
  • the cell ID detection step may include a PSS-based cell ID detection step and an SSS-based cell ID detection step (eg, detecting one physical layer cell ID out of a total of 1008 physical layer cell IDs).
  • the timing detection step may include a timing detection step based on PBCH DM-RS (Demodulation Reference Signal) and a timing detection step based on PBCH content (eg, MIB (Master Information Block)).
  • PBCH DM-RS Demodulation Reference Signal
  • MIB Master Information Block
  • the UE may assume that reception occasions of PBCH, PSS, and SSS exist on consecutive symbols. (That is, the UE may assume that the PBCH, PSS, and SSS constitute an SS / PBCH block, as described above). Subsequently, the UE may assume that the SSS, PBCH DM-RS, and PBCH data have the same Energy Per Resource Element (EPRE). In this case, the UE may assume that the ratio of the PSS EPRE to the SSS ERPE of the SS / PBCH block in the corresponding cell (ratio of PSS EPRE to SSS EPRE) is 0 dB or 3 dB.
  • ERE Energy Per Resource Element
  • SI-RNTI System Information-Random Network Temporary Identifier
  • P-RNTI Paging-Random Network Temporary Identifier
  • RA-RNTI Random Access-Random Network Temporary Identifier
  • DCI format 1_0 having cyclic scrambled CRC (Cyclic Redundancy Check) ratio of PDCCH DMRS EPRE to SSS EPRE (ratio of PDCCH DMRS EPRE to SSS EPRE) It can be assumed that this is within -8 dB to 8 dB.
  • the UE may acquire time synchronization and physical cell ID of the detected cell through PSS and SSS detection. More specifically, the terminal may acquire symbol timing for an SS block through PSS detection and detect a cell ID in a cell ID group. Subsequently, the UE detects the cell ID group through SSS detection.
  • the terminal may detect the time index (eg, slot boundary) of the SS block through DM-RS of the PBCH. Subsequently, the terminal may acquire half frame boundary information and system frame number (SFN) information through the MIB included in the PBCH.
  • time index eg, slot boundary
  • SFN system frame number
  • the PBCH may indicate that the associated (or corresponding) RMSI PDCCH / PDSCH is transmitted in the same band or a different band from the SS / PBCH block.
  • the UE can receive RMSI (eg, system information other than a Master Information Block (MIB)) transmitted from a frequency band indicated by the PBCH or a frequency band through which the PBCH is transmitted after decoding the PBCH.
  • RMSI eg, system information other than a Master Information Block (MIB)
  • the first symbol indices for candidate SS / PBCH blocks may be determined according to subcarrier spacing of SS / PBCH blocks as follows. At this time, index # 0 corresponds to the first symbol of the first slot in the half frame.
  • the first symbols of candidate SS / PBCH blocks may have symbols of ⁇ 2, 8 ⁇ + 14 * n.
  • n has a value of 0 or 1.
  • n has a value of 0, 1, 2 or 3.
  • the first symbols of candidate SS / PBCH blocks may have symbols of ⁇ 4, 8, 16, 32 ⁇ + 28 * n.
  • n has a value of 0.
  • n has a value of 0 or 1.
  • the first symbols of candidate SS / PBCH blocks may have symbols of ⁇ 2, 8 ⁇ + 14 * n.
  • n has a value of 0 or 1.
  • n has a value of 0, 1, 2 or 3.
  • the first symbols of candidate SS / PBCH blocks may have ⁇ 4, 8, 16, 20 ⁇ + 28 * n symbols.
  • n has values of 0, 1, 2, 3, 5, 6, 7, 8, 19, 11, 12, 13, 15, 16, 17 or 18.
  • the first symbols of candidate SS / PBCH blocks may have symbols of ⁇ 8, 12, 16, 20, 32, 36, 40, 44 ⁇ + 56 * n.
  • n has values of 0, 1, 2, 3, 5, 6, 7 or 8.
  • the terminal may acquire system information.
  • the MIB includes information / parameters for monitoring the PDCCH that schedules the PDSCH carrying System Information Block 1 (SIB1), and is transmitted to the terminal by the base station through the PBCH in the SS / PBCH block.
  • SIB1 System Information Block 1
  • the terminal may check whether a Control Resource Set (CORESET) for a Type0-PDCCH common search space exists based on the MIB.
  • CORESET Control Resource Set
  • the Type0-PDCCH common search space is a type of PDCCH search space and is used to transmit a PDCCH for scheduling SI messages.
  • the UE When a Type0-PDCCH common search space exists, the UE based on information in the MIB (eg, pdcch-ConfigSIB1) (i) a plurality of contiguous resource blocks and one or more contiguous (consecutive) constituting CORESET The symbols and (ii) the PDCCH opportunity (eg, time domain location for PDCCH reception) may be determined.
  • MIB eg, pdcch-ConfigSIB1
  • the PDCCH opportunity eg, time domain location for PDCCH reception
  • pdcch-ConfigSIB1 provides information on the frequency location where SSB / SIB1 exists and the frequency range where SSB / SIB1 does not exist.
  • SIB1 includes information related to availability and scheduling (eg, transmission period, SI-window size) of the remaining SIBs (hereinafter, SIBx, x is an integer greater than or equal to 2).
  • SIB1 may indicate whether SIBx is periodically broadcast or provided by an on-demand method (or by a terminal request).
  • SIBx may include information necessary for a terminal to perform an SI request.
  • SIB1 is transmitted through the PDSCH, PDCCH scheduling SIB1 is transmitted through the Type0-PDCCH common search space, and SIB1 is transmitted through the PDSCH indicated by the PDCCH.
  • Synchronization raster if there is no explicit signaling for the SSB location, refers to the frequency location of the SSB that can be used by the terminal for obtaining system information.
  • Global synchronization raster is defined for all frequencies.
  • the frequency location of the SSB is defined by SS REF and the corresponding number GSCN (Global Synchronization Channel Number).
  • the parameters that define SS REF and GSCN for all frequency ranges are:
  • the mapping between the resource blocks of the synchronization raster and the corresponding SSB may be based on the following table.
  • the mapping depends on the total number of resource blocks allocated in the channel, and can be applied to both UL and DL.
  • a list of maximum M TCI (Transmission Configuration Indicator) state settings for one terminal may be set.
  • the maximum M TCI state setting may be set by the upper layer parameter PDSCH-Config so that (the UE) can decode the PDSCH upon detection of the PDCCH including the DCI intended for the UE and a given serving cell. have.
  • the M value may be determined depending on the capability of the terminal.
  • Each TCI-state includes a parameter for setting a QCL (quasi co-location) relationship between one or two downlink reference signals and DMRS ports of the PDSCH.
  • the QCL relationship is established based on the upper layer parameter qcl-Type1 for the first DL RS (downlink reference signal) and the upper layer parameter qcl-Type2 for the second DL RS (if set).
  • the QCL types should not be the same (shall not be the same).
  • the QCL types correspond to each DL RS given by the upper layer parameter qcl-Type in the upper layer parameter QCL-Info , and the QCL types can have one of the following values.
  • the terminal receives an activation command (activation command) used to map the maximum 8 TCI states with a codepoint of a Transmission Configuration Indication (TCI) field in DCI.
  • activation command used to map the maximum 8 TCI states with a codepoint of a Transmission Configuration Indication (TCI) field in DCI.
  • TCI Transmission Configuration Indication
  • the mapping between code points of the TCI fields in the TCIs states and the DCI is slot # (n + 3 * N subframe, ⁇ slot + It can be applied from 1).
  • N subframe, ⁇ slot is determined based on Table 4 or Table 5 described above.
  • the terminal After the terminal receives the initial higher layer configuration of the TCI states (initial higher layer configuration) and before the terminal receives the activation command, the terminal has the DMRS port (s) of the PDSCH of the serving cell is' QCL-TypeA From the viewpoint, it is assumed that it is QCL with the SS / PBCH block determined in the initial access procedure. Additionally, at the time, the UE may assume that the DMRS port (s) of the PDSCH of the serving cell is QCL with the SS / PBCH block determined in the initial access procedure from the perspective of 'QCL-TypeD'.
  • the UE assumes that the TCI field exists in the PDCCH of DCI format 1_1 transmitted on the CORESET.
  • the upper layer parameter tci-PresentInDCI is not set or the PDSCH is scheduled by DCI format 1_0, and the time offset between the reception time of the DL DCI and the reception time of the corresponding PDSCH is a threshold Threshold-Sched -Offset (the threshold is determined based on the reported UE capability ) or greater than or equal to, in order to determine the PDSCH antenna port QCL, the UE has a TCI state for the PDSCH or a QCL assumption CORESET used for PDCCH transmission It is assumed that it is the same as the TCI state or QCL assumption applied to.
  • the PDSCH When the upper layer parameter tci-PresentInDCI is set to 'enabled' and the TCI field in DCI scheduling CC (component carrier) indicates the activated TCI states in the scheduled CC or DL BW (point to), the PDSCH When is scheduled by DCI format 1_1, the UE uses TCI-State based on the TCI field included in DCI in the detected PDCCH to determine the PDSCH antenna port QCL. If the time offset between the reception time of the DL DCI and the reception time of the corresponding PDSCH is greater than or equal to a threshold Threshold-Sched-Offset (the threshold is determined based on the reported UE capability), the UE performs the PDSCH of the serving cell.
  • Threshold-Sched-Offset the threshold is determined based on the reported UE capability
  • the DMRS port (s) are QCL with RS (s) in the TCI state for the QCL type parameter (s) given by the indicated TCI stated.
  • the indicated TCI state should be based on the activated TCI states in the slot of the scheduled PDSCH.
  • the terminal assumes that an upper layer parameter tci-PresentInDC I is set to 'enabled' for the CORESET.
  • the terminal is a time between the reception time of the detected PDCCH in the search area set and the reception time of the corresponding PDSCH.
  • the offset is expected to be greater than or equal to the Threshold-Sched-Offset threshold.
  • Higher layer parameters tci-PresentInDC I is for both cases set to 'enabled', or that in the RRC connected mode is not is the upper layer parameter tci-PresentInDC I set, if between reception of the PDSCH corresponding to the reception of the DL DCI time point offset If this threshold is less than Threshold-Sched-Offset , the terminal assumes the following. (i) The DMRS port (s) of the PDSCH of the serving cell has a QCL relationship to RS (s) and QCL parameter (s) in the TCI state.
  • the QCL parameter (s) is for PDCCH QCL indication of CORESET associated with the search area monitored with the lowest CORESET-ID in the last slot in one or more CORESETs in the activation BWP of the serving cell monitored by the terminal.
  • the UE may assume that the DM-RS ports of PDSCH of a serving cell are quasi co-located with the RS (s) in the TCI state with respect to the QCL parameter (s) used for PDCCH quasi co-location indication of the CORESET associated with a monitored search space with the lowest CORESET-ID in the latest slot in which one or more CORESETs within the active BWP of the serving cell are monitored by the UE.)
  • the UE when the 'QCL-TypeD' of the PDSCH DMRS is different from the 'QCL-TypeD' of the PDCCH DMRS overlapped on at least one symbol, the UE expects to prioritize the reception of the PDCCH associated with the corresponding CORESET.
  • This operation can also be applied in the case of an intra band CA (if PDSCH and CORESET are in different CCs). If there is no TCI state including 'QCL-TypeD' among the set TCI states, the UE, regardless of the time offset between the reception time of the DL DCI and the reception time of the corresponding PDSCH, indicates the TCI indicated for the scheduled PDSCH. Obtain another QCL assumption from state
  • the UE For periodic CSI-RS resources in the upper layer parameter NZP-CSI-RS-ResourceSet where the upper layer parameter trs-Info is set, the UE should assume that the TCI state indicates one of the following QCL type (s):
  • the terminal For the CSI-RS resource in the upper layer parameter NZP-CSI-RS-ResourceSet set without upper layer parameter trs-Info and upper layer parameter repetition , the terminal should assume that the TCI state indicates one of the following QCL type (s). :
  • the UE For the CSI-RS resource in the upper layer parameter NZP-CSI-RS-ResourceSet where the upper layer parameter repetition is set, the UE should assume that the TCI state indicates one of the following QCL type (s):
  • the terminal For DMRS of the PDCCH, the terminal should assume that the TCI state indicates one of the following QCL type (s):
  • the UE For DMRS of PDSCH, the UE should assume that the TCI state indicates one of the following QCL type (s):
  • ⁇ 400 MHz frequency resources per component carrier (CC) may be allocated / supported.
  • CC component carrier
  • RF radio frequency
  • CC e.g., eMBB (enhanced Mobile Broadband), URLLC, mMTC (massive Machine Type Communication), etc.
  • different numerology for each frequency band in the CC eg : sub-carrier spacing
  • capability for a maximum bandwidth may be different for each UE.
  • the base station may instruct / set the UE to operate only in some bandwidth, not the entire bandwidth of the broadband CC.
  • the corresponding partial bandwidth may be defined as a bandwidth part (BWP).
  • the BWP may be composed of contiguous resource blocks (RBs) on the frequency axis, and one BWP may correspond to one numerology (eg, sub-carrier spacing, CP length, slot / mini-slot duration, etc.). have.
  • RBs resource blocks
  • numerology eg, sub-carrier spacing, CP length, slot / mini-slot duration, etc.
  • the base station may set multiple BWPs in one CC set for the UE. For example, the base station may set a BWP occupying a relatively small frequency region in a PDCCH monitoring slot, and schedule a PDSCH indicated by the PDCCH (or PDSCH scheduled by the PDCCH) on a larger BWP. Alternatively, the base station may set some UEs to other BWPs for load balancing when UEs are concentrated on a specific BWP. Alternatively, the base station may set some BWPs in the same slot by excluding some spectrums among the entire bandwidth in consideration of frequency domain inter-cell interference cancellation between neighboring cells.
  • the base station may set at least one DL / UL BWP to a UE associated with a broadband CC, and at least one DL / UL BWP among DL / UL BWP (s) set at a specific time (first layer signaling ( Example: DCI, etc.), MAC, RRC signaling, etc.) can be activated.
  • the activated DL / UL BWP may be referred to as an active DL / UL BWP.
  • the UE such as before the initial access (initial access) process or the RRC connection is set up (set up) may not be able to receive the settings for the DL / UL BWP from the base station.
  • DL / UL BWP assumed for this UE is defined as initial active DL / UL BWP.
  • One CORESET include N symb CORESET symbols (corresponding value having a value of 1, 2, 3) in the time domain and includes a CORESET N RB of RB in the frequency domain.
  • One control channel element includes 6 resource element groups (REGs), and one REG is the same as one RB on one OFDM symbol.
  • REGs in the CORESET are numbered in order according to the time-first manner. Specifically, the numbering starts from '0' for the first OFDM symbol in CORESET and the lowest-numbered RB.
  • a plurality of CORESETs may be set for one terminal.
  • Each CORESET is related only to one CCE-to-REG mapping.
  • CCE-to-REG mapping for one CORESET may be interleaved or non-interleaved.
  • the setting information for CORESET can be set by the upper layer parameter ControlResourceSet IE.
  • the setting information for CORESET 0 (eg, common CORESET) can be set by the upper layer parameter ControlResourceSetZero IE.
  • the terminal In order for the base station to support handover operation or inter-cell interference coordination of the terminal, the terminal needs to perform downlink measurement and report it to the base station.
  • the downlink measurement there are various measurement methods and measurement values, such as measurement for radio link monitoring (RLM), measurement for reporting channel state information (CSI), and measurement for radio resource management (RMM).
  • RLM radio link monitoring
  • CSI channel state information
  • RLM radio resource management
  • the RLM measurement may include, for example, downlink measurement used in the process of detecting a radio link failure (RLF) and finding a new radio link.
  • the measurement for CSI reporting may include, for example, a measurement for the UE to measure and report the quality of a downlink channel, selecting / calculating an appropriate rank indicator, a precoding matrix indicator, and a channel quality indicator.
  • the RRM measurement may include, for example, a measurement for determining whether the terminal is handed over.
  • RSRP reference signal received power
  • RSRQ reference signal received quality
  • RSSI received signal strength indicator
  • SINR signal to noise interference ratio
  • SINR signal to noise interference ratio
  • a synchronization signal (Synchronization Signal) or a channel state information reference signal (CSI-RS) is utilized as a reference signal for RRM measurement.
  • CSI-RS channel state information reference signal
  • SS-RSRP is defined as the linear average of the powers of the resource elements carrying the SSS within the measured frequency bandwidth.
  • the measurement time resource for SS-RSRP is limited within the SS / PBCH block measurement time configuration (SMTC) window section. If SS-RSRP is used for the L1-RSRP set by the reporting setting, the measurement time resource limitation by the SMTC window section is not applied.
  • SMTC SS / PBCH block measurement time configuration
  • CSI-RS may be utilized as well as SSS as well as PBCH DM-RS and, if indicated from a higher layer.
  • SS-RSRP using PBCH DM-RS or CSI-RS is defined as a linear average of power of a resource element carrying a corresponding reference signal in consideration of power scaling of the reference signal. If SS-RSRP is not used for L1-RSRP, it is not applied that CSI-RS is additionally utilized for SS-RSRP determination.
  • SS-RSRP can be measured only by reference signals corresponding to an SS / PBCH block having the same SS / PBCH block index and the same physical layer cell identifier.
  • CSI-RSRP is defined as the linear average of the powers of the resource elements carrying CSI-RS.
  • the CSI-RS set for RSRP measurement may be set in the measurement frequency bandwidth considered in the set CSI-RS occasions (CSI-RS occasions).
  • Molecular (N ⁇ SS-RSRP) and denominator (NR carrier RSSI) are measured for the same set of resource blocks.
  • 'NR carrier RSSI' is the OFDM of the measurement time resource in the measurement bandwidth, over N resource blocks, for received signals from all sources including co-channel serving and non-serving cells, adjacent channel interference, thermal noise, etc. Includes a linear average of the total received power measured by the terminal in symbols only.
  • the measurement time resource for the NR carrier RSSI is limited within the SMTC window section. Additionally, when indicated by a higher layer, the NR carrier RSSI is measured from slots and symbols indicated by higher layer signaling.
  • CSI-RSRQ N ⁇ CSI-RSRP / ( CSI RSSI) .
  • Molecular (N ⁇ CSI-RSRP) and denominator (CSI-RSSI) are measured for the same set of resource blocks.
  • 'CSI-RSSI' is OFDM for measurement time resource in measurement bandwidth, over N resource blocks, for received signals from all sources, including co-channel serving and non-serving cells, adjacent channel interference, thermal noise, etc. Includes a linear average of the total received power measured by the terminal in symbols only.
  • the measurement time resource for the CSI-RSSI corresponds to OFDM symbols including set CSI-RS occasions.
  • SS-SINR is defined as a value obtained by dividing a linear average of powers of a resource element carrying an SSS within a same frequency bandwidth by a linear average of noise and interference powers of a resource element carrying the SSS.
  • the measurement time resource for SS-SINR is limited within the SMTC window.
  • PBCH DMRS may be used in addition to SSS.
  • CSI-SINR is defined as a value obtained by dividing a linear average of power of a resource element carrying CSI-RS within a same frequency bandwidth by a linear average of noise and interference power of a resource element carrying CSI-RS.
  • FIG. 17 is a diagram showing an RRC state and an RRC state transition of a terminal.
  • the terminal has only one RRC state at a specific time.
  • NR / NGC NR / Next Gen Core
  • E-UTRAN / EPC Evolved-Universal Terrestrial Radio Access Network / Evolved Packet Core
  • the RRC state indicates whether the RRC layer of the terminal is logically connected to the layer of the NG Radio Access Network (RAN).
  • RAN Radio Access Network
  • the UE In the RRC_CONNECTED state or in the RRC_INACTIVE state, the UE has an RRC connection, and accordingly, the NG RAN can recognize the presence of the UE in units of cells.
  • the terminal In the RRC_IDLE state, the terminal cannot be recognized by the NG RAN, and the terminal is managed by the core network in a tracking area unit wider than a cell.
  • the terminal finds an appropriate cell and maintains the RRC IDLE state in the cell.
  • the terminal in the RRC IDLE state establishes an RRC connection with the NG RAN through the RRC connection procedure, and switches to the RRC_CONNECTED state or RRC_INACTIVE state.
  • the RRC states of the terminal have the following characteristics.
  • the terminal may be configured for DRX (discontinuous reception) by the upper layer
  • the terminal monitors the paging channel
  • the terminal performs neighbor cell measurement and cell (re) selection
  • the terminal acquires system information
  • the terminal may be set to DRX (discontinuous reception) by the upper layer or the RRC layer
  • the terminal stores the AS (Access Stratum) context
  • the terminal monitors the paging channel
  • the terminal performs neighbor cell measurement and cell (re) selection
  • the terminal When moving outside the RAN-based notification area, the terminal performs RAN-based notification area update
  • the terminal acquires system information
  • the terminal transmits and receives unicast data
  • the terminal may be configured with a terminal-specific DRX
  • a terminal supporting CA Carrier Aggregation
  • SCell SCell combined with SpCell (Special Cell)
  • a terminal supporting dual connectivity can use a secondary cell group (SCG) combined with a master cell group (MCG)
  • SCG secondary cell group
  • MCG master cell group
  • the terminal monitors the paging channel
  • the terminal monitors the control channels associated with the shared data channel
  • the terminal provides channel quality and feedback information
  • the terminal performs neighbor cell measurement and cell (re) selection
  • the terminal acquires system information
  • the terminal in the RRC_IDLE state and the RRC_INACTIVE state may operate as follows.
  • a terminal may perform a DRX operation.
  • a terminal in which DRX is set may lower power consumption by discontinuously receiving a DL signal.
  • DRX may be performed in a Radio Resource Control (RRC) _IDLE state, an RRC_INACTIVE state, or an RRC_CONNECTED state.
  • RRC_IDLE state and RRC_INACTIVE state DRX is used to discontinuously receive the paging signal.
  • RRC_CONNECTED DRX DRX performed in the RRC_CONNECTED state will be described (RRC_CONNECTED DRX).
  • FIG. 19 is a diagram illustrating a DRX cycle of a terminal applicable to the examples of the present description.
  • the DRX cycle shown in FIG. 19 corresponds to the DRX cycle of the terminal in the RRC_CONNECTED state.
  • the DRX cycle is composed of On Duration and Opportunity for DRX.
  • the DRX cycle defines a time interval in which On Duration is periodically repeated.
  • On Duration indicates a time period that the UE monitors to receive the PDCCH.
  • the UE performs PDCCH monitoring for On Duration.
  • the terminal operates an inactivity timer and maintains an awake state.
  • the terminal enters a sleep state after the On Duration is over. Accordingly, when DRX is set, PDCCH monitoring / reception may be discontinuously performed in the time domain in performing the above-described / suggested procedures and / or methods.
  • the PDCCH reception opportunity (eg, a slot having a PDCCH search space) may be discontinuously set according to the DRX setting.
  • PDCCH monitoring / reception may be continuously performed in the time domain in performing the above-described / suggested procedures and / or methods.
  • the PDCCH reception opportunity (eg, a slot having a PDCCH search space) may be continuously set.
  • PDCCH monitoring may be limited in a time interval set as a measurement gap.
  • Table 10 shows a process of a terminal related to DRX (RRC_CONNECTED state).
  • DRX configuration information is received through higher layer (eg, RRC) signaling, and whether DRX ON / OFF is controlled by a DRX command of the MAC layer.
  • RRC higher layer
  • the UE may discontinuously perform PDCCH monitoring in performing the procedures and / or methods described / suggested in the examples of the present disclosure, as illustrated in FIG. 19.
  • MAC-CellGroupConfig includes configuration information necessary to set a medium access control (MAC) parameter for a cell group.
  • MAC-CellGroupConfig may also include configuration information about DRX.
  • MAC-CellGroupConfig defines DRX and may include information as follows.
  • -Value of drx-InactivityTimer Defines the length of time period in which the UE remains awake after the PDCCH opportunity where the PDCCH indicating the initial UL or DL data is detected.
  • -Value of drx-HARQ-RTT-TimerDL Defines the length of the maximum time interval from receiving the DL initial transmission to receiving the DL retransmission.
  • -Value of drx-HARQ-RTT-TimerDL Defines the length of the maximum time interval from when the grant for UL initial transmission is received until the grant for UL retransmission is received.
  • the UE maintains the awake state and performs PDCCH monitoring at every PDCCH opportunity.
  • FIG. 20 shows an example of a wireless communication system supporting an unlicensed band applicable to the examples of the present description.
  • a cell operating in a licensed band (hereinafter, 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, 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.
  • the cell / carrier (eg, CC) is collectively referred to as a cell.
  • LCC may be set to PCC (Primary CC) and UCC to SCC (Secondary CC).
  • the terminal and the base station may transmit and receive signals through one UCC or a plurality of carrier-coupled LCCs and UCCs. That is, the terminal and the base station can transmit and receive signals through only UCC (s) without LCC.
  • the signal transmission / reception operation in the unlicensed band described in the examples of the present disclosure may be performed based on all the above-described deployment scenarios (unless otherwise stated).
  • LTE frame structure type 3 (see FIG. 3) or NR frame structure (see FIG. 7) may be used.
  • the configuration of OFDM symbols occupied for uplink / downlink signal transmission in a frame structure for an unlicensed band may be set by a base station.
  • the OFDM symbol may be replaced with an SC-FDM (A) symbol.
  • the base station may inform the UE of the configuration of OFDM symbols used in subframe #n or slot #n through signaling.
  • a subframe or slot may be replaced with a time unit (TU).
  • the base station may perform the following downlink channel access procedure (CAP) for the unlicensed band in order to transmit a downlink signal in the unlicensed band.
  • CAP downlink channel access procedure
  • the examples of the present disclosure are indicated by displaying the unlicensed band as a Licensed Assisted Access (LAA) S cell
  • LAA Licensed Assisted Access
  • the downlink CAP operation applicable to the description will be described in detail. However, the downlink CAP operation may be equally applied even when only an unlicensed band is set for the base station.
  • Channel access procedure for transmission including PDSCH / PDCCH / EPDCCH (channel access procedure for transmission (s) including PDSCH / PDCCH / EPDCCH)
  • the base station senses whether the channel is in an idle state during the slot period of the delay duration T d , and after the counter N is 0 in step 4 below, the next unlicensed band cell (eg, LAA) S cell or NR-U cell, etc.) can be transmitted on the carrier where the transmission is performed, including PDSCH / PDCCH / EPDCCH.
  • the counter N is adjusted by channel sensing for additional slot duration according to the following procedure:
  • N init N init .
  • N init is an arbitrary number of evenly distributed between p is from 0 CW (random number uniformly distributed between 0 and CW p). Then, the process moves to Step 4.
  • step 3 A channel for an additional slot section is sensed. At this time, if the additional slot section is idle, the process moves to step 4. If not, go to step 5.
  • step 6 If the corresponding channel is sensed as idle during all slot periods of the additional delay period T d , the process moves to step 4. If not, go to step 5.
  • the CAP for transmission including the above-described PDSCH / PDCCH / EPDCCH of the base station can be summarized as follows.
  • 21 is a diagram for describing a CAP for unlicensed band transmission applicable to the examples of the present description.
  • a transmitting node may initiate a channel access process (CAP) to operate in an unlicensed band cell (eg, LAA S cell or NR-U cell) (S2110).
  • CAP channel access process
  • the base station may arbitrarily select the backoff counter N within the contention window CW according to step 1.
  • the N value is set to the initial value N init (S2120).
  • N init is selected as any value between 0 and CW p .
  • the base station ends the CAP process (S2132). Subsequently, the base station may perform Tx burst transmission including PDSCH / PDCCH / EPDCCH (S2134). On the other hand, if the backoff counter value is not 0 (S2130; N), the base station decreases the backoff counter value by 1 according to step 2 (S2140).
  • the base station checks whether the channel of the unlicensed band cell (eg, LAA S cell or NR-U cell) is idle (S2150), and if the channel is idle (S2150; Y), the backoff counter value is 0 Check whether it is (S2130).
  • the channel of the unlicensed band cell eg, LAA S cell or NR-U cell
  • step S2150 if the channel is not idle in step S2150, that is, if the channel is busy (S2150; N), the base station according to step 5 has a longer delay time than the slot time (eg, 9usec) (defer duration T d ; 25usec) While), it is checked whether the corresponding channel is idle (S2160). If the channel is idle in the delay period (S2170; Y), the base station can resume the CAP process again.
  • the slot time eg, 9usec
  • the base station senses the channel for a delay period to determine whether it is idle. At this time, if the channel is idle during the delay period, the base station does not set the backoff counter value N init , but performs the CAP process again from the backoff counter value 5 (or 4 after decreasing the backoff counter value 1). You can.
  • step S2160 the base station re-performs step S2160 to check whether the channel is idle during the new delay period.
  • the base station performs If the condition is satisfied, a transmission including PDSCH / PDCCH / EPDCCH can be transmitted on the carrier:
  • the base station When the base station is prepared to transmit PDSCH / PDCCH / EPDCCH and the corresponding channel is sensed as idle during at least the slot period T sl , and immediately before the transmission, the channel is established during all slot periods of the delay period T d immediately before the transmission.
  • the base station When sensing as children
  • the base station senses the channel after being prepared to transmit, the channel is not sensed as idle during the slot period T sl , or any one of the delay period T d immediately before the intended transmission (immediately before). If the channel is not sensed as idle during the period, the base station proceeds to step 1 after sensing that the channel is idle during the slot period of the delay period T d (proceed to step 1).
  • each slot section T sl is 9us
  • T f includes an idle slot section T sl at a starting point of T f .
  • the slot period T sl is considered as idle. Becomes (be considered to be idle). Otherwise, the slot section T sl is considered busy.
  • CW p adjustment (CW p adjustment) is described in detail in 2.2.3 described later to section.
  • the base station If N> 0 in the procedure, if the base station transmits discovery signal transmission (discovery signal transmission) that does not include PDSCH / PDCCH / EPDCCH, the base station decrements counter N during a slot period overlapping with the discovery signal transmission. Do not order.
  • the BS unlicensed band cells (such as: LAA S cell or a NR-U cells, and so on) for a period exceeding the T mcot, p of the table 11 on the carrier wave to be transmitted is performed (for a period exceeding T mcot, p), continuous It does not perform an explicit transmission.
  • T mcot, p is set to 10 ms. Otherwise, T mcot, p is set to 8 ms.
  • T f includes an idle slot section T sl at the starting point of T f .
  • the base station When the base station performs transmission including the PDSCH associated with the channel access priority class p on the carrier, the base station performs 2.2.1. Maintain the contention window value CW p and adjust CW p using the following procedures before step 1 of the procedure detailed in the section (ie, prior to performing the CAP):
  • the base station when the probability that HARQ-ACK values corresponding to the PDSCH transmission (s) in the reference subframe k is determined to be NACK is at least 80%, the base station allows each set of CW values for each priority class, and then transmits the next value. Increase by rank. Or, the base station maintains the CW values set for each priority class as initial values.
  • the reference subframe k is the starting subframe of the most recent transmission on the carrier made by the base station, where at least some HARQ-ACK feedback is expected to be available (Reference subframe k is the starting subframe of the most recent transmission on the carrier made by the eNB, for which at least some HARQ-ACK feedback is expected to be available).
  • the base stations are all priority classes Adjust the CW p value for for based on the reference subframe k given only once.
  • the probability (Z) that HARQ-ACK values corresponding to PDSCH transmission (s) in the reference subframe k are determined as NACK may be determined by considering the following items.
  • the HARQ-ACK values are the same unlicensed band cell allocated by (E) PDCCH transmitted from an unlicensed band cell (eg, LAA S cell or NR-U cell, etc.) (eg LAA S cell or NR-U cell, etc.) ) On the PDSCH transmission (s),
  • an unlicensed band cell eg, LAA S cell or NR-U cell, etc.
  • LAA S cell or NR-U cell, etc. eg LAA S cell or NR-U cell, etc.
  • NACK If HARQ-ACK feedback for PDSCH transmission by the base station is not detected, or if the base station detects 'DTX', 'NACK / DTX' or other (any) status, it is counted as NACK (it is counted as NACK).
  • the 'NACK / DTX' or other (any) state is counted as NACK and the 'DTX' state is ignored.
  • the HARQ-ACK value of each codeword is considered individually.
  • M HARQ-ACK responses are considered as M HARQ-ACK responses.
  • the base station transmits a PDCCH / EPDDCH (PDCCH / EDPCCH with DCI format 0A / 0B / 4A / 4B) of DCI format 0A / 0B / 4A / 4B and does not include a PDSCH associated with channel access priority class p
  • PDCCH / EPDDCH PDCCH / EDPCCH with DCI format 0A / 0B / 4A / 4B
  • the base station 2.2.1. Maintain the contention window size CW p and adjust CW p using the following procedures before step 1 of the procedure detailed in the section (i.e., prior to performing the CAP):
  • T CO is 2.3.1. Is calculated according to the clause.
  • the base station accessing the carrier where the unlicensed band cell (eg, LAA S cell or NR-U cell) transmission is performed sets the energy detection threshold (X Thresh ) to a maximum energy detection threshold X Thresh_max or less.
  • the maximum energy detection threshold X Thresh_max is determined as follows.
  • X r is a maximum energy detection threshold (in dBm) defined in regulatory requirements when a rule is defined. If not,
  • each variable is defined as follows.
  • the base station may access multiple carriers on which unlicensed band cell (eg, LAA S cell or NR-U cell) transmission is performed through one of the following type A or type B procedures.
  • unlicensed band cell eg, LAA S cell or NR-U cell
  • the base station can transmit each carrier Perform phase channel access.
  • C is a set of carriers to be transmitted (intend to transmit) by the base station
  • q is the number of carriers that the base station intends to transmit.
  • the counter N of the clause (i.e. counter N considered in the CAP) is the carrier It is decided by each. In this case, the counter for each carrier is Is indicated. At this time, 2.2.5.1.1. Or 2.2.5.1.2. It is maintained according to the clause.
  • the counter N of the clause (i.e. counter N considered in the CAP) is the carrier It is decided independently for each, and the counter for each carrier is Is indicated.
  • Base station is one carrier When the phase transmission is ceased, if the absence of other technologies sharing the carrier can be guaranteed for a long period (e.g., by the level of regulation) (if the absence of any other technology sharing the carrier can be guaranteed on a long term basis (eg, by level of regulation)), each carrier c i (where c i differs from c j , )for, After waiting for a section of or If an idle slot is detected after re-initializing, the base station The reduction can be resumed.
  • Each carrier The star counter N is described above in 2.2.1. It can be determined according to the section, where each carrier counter Is indicated. here, Can mean a carrier having the largest CW p value. Each carrier for, Can be set to
  • the base station is multi-carrier Uniformly randomly from the C prior to transmission of each phase Select or
  • the base station is at least once every 1 second Do not select
  • C is a set of carriers to be transmitted (intend to transmit) by the base station
  • q is the number of carriers that the base station intends to transmit.
  • the base station For transmission on the base station, the base station is 2.2.5.2.1. Section or 2.2.5.2.2. Along with the corrections described in Section 2.2.1. Carrier according to the procedure described in the section Channel connection.
  • the base station is a carrier At least immediately before the transmission on the (immediately) sensing interval (sensing interval) While carrier To sense. And, the base station is at least a sensing section While carrier Immediately after sensing that they are children (immediately after) You can perform the transmission. Given interval My carrier When the channel is sanded to idle during all time intervals during which phase idle sensing is performed, the carrier The For children can be considered.
  • the base station is a carrier (At this time, ) For a period exceeding the T mcot, p of Table 6 on (for a period exceeding mcot T, p) it does not perform successive transmission. Where T mcot, p is the carrier It is determined using the channel access parameters used for.
  • a single CW p value is maintained for carrier set C.
  • Step 2 of the procedure described above in the section is modified as follows.
  • the CW p values are For independent maintenance.
  • carrier To determine N init for carrier The CW p value of is used. here, Is the carrier with the largest CW p of all carriers in set C.
  • the UE and the base station scheduling the UL transmission for the UE perform the following procedure for access to a channel performing transmission (s) of an unlicensed band cell (eg, LAA S cell or NR-U cell).
  • an unlicensed band cell eg, LAA S cell or NR-U cell.
  • a P cell that is a licensed band and a S cell that is one or more unlicensed bands are set for a terminal and a base station, and that the unlicensed band is indicated as a LAA S cell and applicable to the examples of the present description
  • the uplink CAP operation will be described in detail. However, the uplink CAP operation may be equally applied even when only an unlicensed band is set for the terminal and the base station.
  • the UE may access an unlicensed band cell (eg, LAA S cell or NR-U cell, etc.) on a carrier on which UL transmission (s) is performed according to a type 1 or type 2 UL channel access procedure.
  • an unlicensed band cell eg, LAA S cell or NR-U cell, etc.
  • a type 1 or type 2 UL channel access procedure see 2.3.1.1. This is detailed in the section.
  • For the type 2 channel access procedure see 2.3.1.2. This is detailed in the section.
  • the UE performs a type 1 channel access to perform transmission including the PUSCH transmission, unless otherwise specified in this section.
  • the UE performs a type 2 channel access to perform transmission including the PUSCH transmission, unless otherwise stated in this section.
  • the UE For SRS (Sounding Reference Signal) transmission that does not include PUSCH transmission, the UE performs a type 1 channel connection.
  • UL channel access priority class p 1 is used for SRS transmission without PUSCH.
  • a type 2 channel access procedure may be used for intra-transmission.
  • the UE uses PDCCH DCI format 0B / 4B, a set of subframes Scheduled to perform transmission including my PUSCH, and the UE is a subframe
  • the UE subframes according to the channel connection type indicated in the DCI. Shall attempt to make a transmission.
  • And w is the number of scheduling subframes indicated in the DCI.
  • the subframe set It is scheduled to perform transmission without gaps including PUSCH (transmission without gaps including PUSCH), and the subframe after the UE is connected to a carrier according to one of the type 1 or type 2 channel access procedure
  • the UE is a subframe Transmission may continue from there (may continue transmission in subframe after ). here, to be.
  • the subframe Scheduled to perform my transmission without gaps can be performed using a type 2 channel access procedure. If the channel is not continuously sensed as idle by the UE after the UE stops transmitting, the UE subframes After (here, ) Subframe
  • the transmission may be performed using the type 1 channel access procedure of the UL channel access priority class indicated in DCI corresponding to.
  • the UE receives the UL grant and DCI instructs to start PUSCH transmission in subframe n using a type 1 channel access procedure, if the UE continues to perform a type 1 channel access procedure before subframe n (the UE has an ongoing Type 1 channel access procedure before subframe n),
  • PUSCH transmission may be performed by accessing a carrier using an ongoing type 1 channel access procedure.
  • the UE proceeds with the channel access procedure in progress Terminate (terminate).
  • the UE is scheduled to transmit on carrier set C in subframe n, if the UL grant scheduling PUSCH transmission on carrier set C indicates a type 1 channel access procedure, if the same for all carriers in carrier set C ' PUSCH starting position 'is indicated, and if the carrier frequencies of carrier set C are a subset of one of the preset carrier frequency sets,
  • the UE is a carrier using a type 1 channel access procedure (The UE has accessed carrier using Type 1 channel access procedure),
  • Base station 2.2.1 When performing transmission on a carrier according to the channel access procedure disclosed in the section (the base station has transmitted on the carrier according to the channel access procedure described in clause 2.2.1), the base station transmits the PUSCH on the carrier in subframe n.
  • a type 2 channel access procedure may be indicated in the DCI of the UL grant for scheduling the included transmission.
  • the base station 2.2.1.
  • the base station uses the 'UL Configuration for LAA' field to allow the UE to transmit a type 2 channel access procedure for PUSCH on the carrier in subframe n. It can indicate that it can be performed.
  • a transmission including a PUSCH on a corresponding carrier may be scheduled.
  • the base station schedules UL transmissions between consecutive subframes in t 0 and t 0 + T CO .
  • the UE may perform a type 2 channel access procedure for the UL transmission.
  • the base station instructs the type 2 channel access procedure for the UE in DCI, the base station indicates the channel access priority class used to obtain the channel access in the DCI (If the base station indicates Type 2 channel access procedure for the UE in the DCI, the base station indicates the channel access priority class used to obtain access to the channel in the DCI).
  • the UE may perform transmission using a type 1 channel access procedure.
  • the counter N is adjusted by sensing a channel for the additional slot period (s) according to the following procedure.
  • N init N init .
  • N init is an arbitrary number of evenly distributed between p is from 0 CW (random number uniformly distributed between 0 and CW p). Then, the process moves to Step 4.
  • step 3 A channel for an additional slot section is sensed. Then, when the additional slot section is idle, the process moves to step 4. If not, go to step 5.
  • step 6 If the channel is sensed as idle during all slot periods of the additional delay period T d , the process moves to step 4. If not, go to step 5.
  • a transmission node eg, UE may initiate a channel access process (CAP) to operate in an unlicensed band cell (eg, LAA S cell or NR-U cell, etc.) (S2110).
  • CAP channel access process
  • the UE may arbitrarily select the backoff counter N within the contention window (CW) according to step 1.
  • the N value is set to the initial value N init (S2120).
  • N init is selected as any value between 0 and CW p .
  • the UE ends the CAP process (S2132). Subsequently, the UE may perform Tx burst transmission (S2134). On the other hand, if the backoff counter value is not 0 (S2130; N), the UE decreases the backoff counter value by 1 according to step 2 (S2140).
  • the UE checks whether the channel of the unlicensed band cell (eg, LAA S cell or NR-U cell, etc.) is idle (S2150), and if the channel is idle (S2150; Y), the backoff counter value is 0 Check whether it is (S2130).
  • the channel of the unlicensed band cell eg, LAA S cell or NR-U cell, etc.
  • step S2150 if the channel is not idle in step S2150, that is, if the channel is busy (S2150; N), the UE according to step 5 has a longer delay time than the slot time (eg, 9usec) (defer duration T d ; 25usec) While), it is checked whether the corresponding channel is idle (S2160). If the channel is idle in the delay period (S2170; Y), the UE may resume the CAP process again.
  • the slot time eg, 9usec
  • the UE senses the channel for a delay period to determine whether it is idle. At this time, if the channel is idle during the delay period, the UE does not set the backoff counter value N init but performs the CAP process again from the backoff counter value 5 (or 4 after decreasing the backoff counter value 1). You can.
  • step S2160 again to check whether the channel is idle during the new delay period.
  • the The UE may transmit transmission including PUSCH on the carrier when the following conditions are satisfied.
  • the unlicensed band cell eg, LAA S cell or NR-U cell
  • the channel in the slot period T sl is not sensed as idle, or the delay period T d immediately before the intended transmission including PUSCH. If the corresponding channel is not sensed as idle during a slot period, the UE proceeds to step 1 after the corresponding channel is sensed as idle during slot periods of the delay period T d .
  • each slot section T sl is 9us
  • T f includes an idle slot section T sl at a starting point of T f .
  • the slot period T sl is considered to be idle (be considered to be idle ). Otherwise, the slot section T sl is considered busy.
  • CW p adjustment (CW p adjustment) will be described in detail in 2.3.2 described later to section.
  • Type 2 UL channel access procedure (Type 2 UL channel access procedure)
  • T short_ul is one slot interval Immediately following (immediately followed) It consists of.
  • T f includes an idle slot section T sl at the starting point of the T f . If the phase is sensed as idle during the slot T short_ul , the channel is considered idle during the T short_ul .
  • the UE performs transmission using a type 1 channel access procedure related to a channel access priority class p on a carrier, the UE performs 2.3.1.1. Maintain the contention window value CW p and adjust CW p using the following procedures before step 1 of the procedure detailed in the section (ie, prior to performing the CAP):
  • HARQ_ID_ref is the HARQ process ID of the UL-SCH in the reference subframe n ref .
  • the reference subframe n ref is determined as follows.
  • the subframe n w is the most recent subframe before the subframe n g -3 in which the UE transmits the UL-SCH using a type 1 channel access procedure.
  • the reference subframe n ref is subframe n 0 .
  • the reference subframe n ref is a subframe n w .
  • the gapless transmission is scheduled to be transmitted using a type 1 channel access procedure, and if the UE cannot perform any transmission including the PUSCH in the subframe set, the UE Priority class To keep CW p value unchanged.
  • CW p value for the use of the recently scheduled Type 1 channel access procedure and the same as the CW p value for transmission including PUSCH may be maintained.
  • the UE accessing the carrier where the unlicensed band cell (eg, LAA S cell, NR-U cell, etc.) transmission is performed sets the energy detection threshold (X Thresh ) to be less than or equal to the maximum energy detection threshold X Thresh_max .
  • the maximum energy detection threshold X Thresh_max is determined as follows.
  • Thresh_max is set equal to the value signaled by the upper layer parameter.
  • Thresh_max is determined according to the procedure described in the section.
  • Thresh_max is set to X ' Thresh_max adjusted according to the offset value signaled by the upper layer parameter.
  • X r is a maximum energy detection threshold (in dBm) defined in regulatory requirements when a rule is defined. If not,
  • each variable is defined as follows.
  • FIG. 22 is a diagram illustrating a partial TTI (partial TTI) or a partial subframe / slot applicable to the examples of the present description.
  • a partial TTI defined as DwPTS is defined in order to make the most of MCOT in DL transmission burst transmission and support continuous transmission.
  • the partial TTI (or partial subframe) refers to an interval in which a signal is transmitted only a length smaller than a conventional TTI (eg, 1 ms) in transmitting a PDSCH.
  • a starting partial TTI (starting partial TTI) or a starting partial subframe / slot refers to a form in which some symbols in the front frame are emptied
  • an ending partial TTI (Ending Partial TTI) or ending partial
  • the subframe / slot refers to a form in which some symbols behind the subframe are emptied.
  • an intact TTI is called a normal TTI or a full TTI.
  • FIG. 22 is a view showing various forms of the partial TTI described above.
  • the first figure of FIG. 22 shows the ending partial TTI (or subframe / slot), and the second figure shows the starting partial TTI (or subframe / slot).
  • the third diagram of FIG. 22 shows a partial TTI (or subframe / slot) in a form in which some symbols in the front and rear in a subframe / slot are emptied.
  • the time interval excluding signal transmission in the general TTI is called a transmission gap (TX gap).
  • FIG. 22 is based on the DL operation, the same may be applied to the UL operation.
  • a form in which PUCCH and / or PUSCH is transmitted may also be applied to a partial TTI structure illustrated in FIG. 22.
  • a wireless communication system (eg, LTE, 5G NR, etc.) to which the examples of the present disclosure can be applied is considering a method of more effectively utilizing a limited frequency band.
  • a method of utilizing an unlicensed band such as the 2.4GHz band or an unlicensed band such as the 5/6 GHz and 60 GHz bands mainly used by the existing WiFi system is used for traffic offloading.
  • each communication node in the unlicensed band performs channel sensing before transmitting a signal, so that other communication nodes do not transmit the signal. It is required to confirm. For convenience of description below, such an operation is defined as a listen before talk (LBT) or a channel access procedure (CAP). As described above, an operation in which a specific communication node checks whether a signal transmitted by another communication node exists is defined as carrier sensing (CS), and it is determined that the signal transmitted by the other communication node does not exist. When it is defined, CCA (clear channel assessment) is defined.
  • the terminal or base station of the LTE / NR system Based on the characteristics of the unlicensed band, the terminal or base station of the LTE / NR system also needs to perform CAP (or LBT) for signal transmission in the unlicensed band (hereinafter referred to as U-band).
  • CAP or LBT
  • U-band unlicensed band
  • other communication nodes such as a WiFi system should also not cause interference by performing CAP (or LBT).
  • the NR systems to which the examples of the present description are applicable include: (i) a PRACH format composed of a length 839 sequence (hereinafter referred to as a long (P) RACH format) and (ii) a PRACH format composed of a length 139 sequence (hereinafter, short) (P) RACH format).
  • a PRACH preamble and a random access (RA) procedure applicable to the examples of the present description will be described in detail to specifically describe an operation example proposed in the examples of the present description.
  • the PRACH preamble can be designed in consideration of the following:
  • the PRACH preamble may be configured based on a Zad (Zadoff-Chu) sequence.
  • PRACH preambles of two different lengths may be supported.
  • the PRACH preamble of length 139 may be defined as PRACH formats A1, A2, A3, B1, B2, B3, B4, C0, C2 as shown in the following table.
  • L RA represents the length of the PRACH sequence
  • SCS sub-carrier spacing
  • CP length Indicates the time axis duration of the PRACH sequence
  • ⁇ represents the parameter representing the neuromerology of Tables 4 and 5. ⁇ has a value of 64.
  • the 839 length PRACH preamble may be defined as PRACH formats 0, 1, 2, and 3 as shown in the following table.
  • the length 139 PRACH preamble (aka short preamble sequence) may be used to support a multi-beam scenario and a TDD frame structure.
  • the length 139 PRACH preamble may be aligned with OFDM symbol boundaries, and may be used in both FR1 (below 6 Ghz) and FR2 (above 6 Ghz).
  • FR1 lower 6 Ghz
  • FR2 above 6 Ghz
  • 15 kHz and 30 kHz subcarrier spacing (SCS) may be supported.
  • SCS subcarrier spacing
  • 60 kHz and 120 kHz SCS can be supported.
  • the length 839 PRACH preamble (aka Long preamble sequence) can be used for LTE coverage and fast speed cases.
  • the 839 PRACH preamble can be used only for FR1 (below 6 GHz).
  • 64 preambles may be defined within each time-frequency PRACH occasion (RO).
  • the 64 preambles are first numbered in ascending order of the cyclic shift of the logical root sequence, and then in ascending order of the logical root sequence. If the 64 preambles are not generated from a single root Zadoff-Chu sequence, additional preambles may be obtained from the root sequences of consecutive logical indexes until a total of 64 preambles are found.
  • the (P) RACH slot may include one or more ROs.
  • the slot length can be set to 1 ms.
  • the slot length can be set to 0.25 ms.
  • the starting OFDM symbol index in which the PRACH preamble in the (P) RACH slot for the short preamble format is transmitted may be set to ⁇ 0, 2, X ⁇ .
  • the PRACH preamble can be transmitted only on the time resource given by the upper layer parameter prach-ConfigurationIndex .
  • the RA procedure may be initiated based on a PDCCH order, a terminal's MAC entity, or RRC signaling for specific events.
  • the RA procedure can be triggered by the following events:
  • RA procedures include contention-based RA procedures and contention-free RA procedures.
  • the following parameters for the RA procedure can be set through RRC signaling.
  • the following UE parameters can be used for RA procedures.
  • 23 is a view simply showing a random access procedure applicable to the examples of the present disclosure.
  • the terminal may receive system information (for initial attach) or RRC connection re-configuration information (for LTE interplay) from the base station.
  • the UE may transmit Msg1 (PRACH preamble) to the base station.
  • Msg1 PRACH preamble
  • the UE may transmit a PRACH premable masked (or scrambled) with RA-RNTI to the base station.
  • the UE can determine PREAMBLE_INDEX in consideration of various matters defined in the standard spec.
  • the UE calculates the RA-RNTI associated with the PRACH occasion where the RA preamble is transmitted, and causes the physical layer to select the selected PRACH, the corresponding RA-RNTI, PREAMBLE_INDEX, and PREAMBLE_RECEIVED_TARGET_POWER . It is possible to instruct to transmit the preamble.
  • a RA-RNTI value corresponding to each RO may be calculated based on the following equation.
  • s_id corresponds to the index of the first OFDM symbol of the specified PRACH, and may have a value greater than or equal to 0 and less than 14.
  • t_id corresponds to the index of the first OFDM symbol of the designated PRACH in the system frame, and may have a value greater than or equal to 0 and less than 80.
  • f_id corresponds to the index of the designated PRACH in the frequency domain, and may have a value greater than or equal to 0 and less than 8.
  • ul_carrier_id may have a value of 0 when a UL carrier used for Msg1 transmission is a NUL (Normal uplink) carrier, and 1 when a SUL (Supplementary uplink) carrier is used.
  • the UE may receive Msg 2 (eg, RAR (Random Access Response) (via PDCCH / PDSCH)) in the corresponding step (ie, PRACH transmission) Afterwards), the following procedures can be performed.
  • Msg 2 eg, RAR (Random Access Response) (via PDCCH / PDSCH)
  • step ie, PRACH transmission
  • the base station transmits the DCI scrambled with the RA-RNTI value (calculated previously) to the base station.
  • the UE may attempt to detect a PDCCH (eg, DCI) masked (or scrambled) with a corresponding RA-RNTI in the RAR-Window section. For example, in ra-ResponseWindow, the terminal may find DCI in a search area (eg, a Type 1 PDCCH Common Search Space) (look for).
  • a PDCCH eg, DCI
  • a search area eg, a Type 1 PDCCH Common Search Space
  • -DCI format 1_0 masked (or scrambled) with RA-RNTI may be used as a DCI format for scheduling RAR PDSCH.
  • the terminal may transmit Msg3 to the base station (via PUSCH).
  • the step (ie, just before sending Msg3) the following procedures can be performed.
  • the UE must decide whether to apply transform precoding for Msg3 PUSCH.
  • the UE must determine the subcarrier spacing for Msg3 PUSCH.
  • the UE should transmit the Msg3 PUSCH on the same serving cell that has transmitted the PRACH.
  • the terminal may receive Msg4 (eg, Contention Resolution) (via PDCCH / PDSCH) from the base station.
  • Msg4 eg, Contention Resolution
  • the following procedures can be performed. For convenience of explanation, only the success cases are described below.
  • -Monitoring for decoding a PDCCH masked (or scrambled) with TC-RNTI is performed.
  • TC-RNTI Temporal C-RNTI
  • the UE searches for DCI in the search area (eg, Type 1 PDCCH Common Search Space).
  • the terminal decodes the PDSCH carrying the MAC CE
  • --C-RNTI TC-RNTI
  • the terminal may transmit the HARQ ACK signal for Msg4 to the base station.
  • Msg4 Contention Resolution
  • the UE may transmit HARQ ACK for data (eg, PDSCH carrying Msg4).
  • this document describes in detail a configuration of a frequency axis RACH occasion in a short RACH format for an unlicensed band and an operation example of a terminal / base station based thereon.
  • 24 is a diagram showing an example of a PRACH format composed of a length 139 sequence.
  • the subcarrier spacing (SCS) of the corresponding short RACH format in frequency range 1 may be set to 15 kHz or 30 kHz.
  • (P) RACH based on the short RACH format may be transmitted through 139 tones (or subcarrier) among 12 RBs (144 REs).
  • RACH based on the short RACH format may be transmitted through 139 tones (or subcarrier) among 12 RBs (144 REs).
  • 139 tones or subcarrier
  • 3 null tones may be disposed in the lower RE index
  • 2 null tones may be disposed in the upper RE index.
  • null tones may be disposed in the lower RE index
  • 4 null tones may be disposed in the upper RE index
  • 4 null tones may be disposed in the lower RE index
  • 1 null tones may be disposed in the upper RE index
  • 5 null tones may be disposed only in the lower RE index
  • 5 null tones may be disposed only in the upper RE index.
  • the first method of dividing and transmitting the PRACH of FIG. 24 in units of A RBs is called an interlaced PRACH, and the PRACH of FIG. 24 is set as one basic unit and the second basic unit is repeatedly transmitted on a frequency axis
  • the method is called concatenated PRACH.
  • One interlace on the unlicensed band may be defined as a set of resources having a certain frequency interval (eg, cluster interval) of a certain number of clusters (eg, cluster number) having a certain frequency size (eg, cluster size).
  • the cluster is a minimum unit of contiguous resources in the frequency domain, and the size may be an RB unit.
  • a PRACH preamble composed of N subcarriers is transmitted by dividing it into clusters having C R RB sizes, but clusters including a relatively small number of subcarriers among clusters are relatively larger than other clusters. It can contain any number of null tones.
  • M (i) subcarriers are distributed to cluster i
  • M (i) floor (N / C) + O (i) and O (i) is 0 or 1 for each cluster. It can have a value.
  • floor (Z) may mean the largest integer value among integers less than or equal to Z.
  • a PRACH format composed of a sequence of length 139 will be mainly described, but the same may be applied to a PRACH format composed of sequences of other lengths (eg, length 839 sequences, etc.) proposed in the examples of the present description. .
  • 25 is a diagram briefly showing an example of a first interlaced PRACH configuration disclosed in this document.
  • two clusters may be configured to include 70 tones and 69 tones in a sequence corresponding to a total of 139 tones, respectively.
  • FIG. 25 an example in which 70 tones is mapped to the lower RB index and 69 tones is mapped to the upper RB index, however, according to an embodiment, the number of tones mapped to each RB may be set in reverse.
  • FIG. 25 illustrates an example in which two null tones are mapped to a lower RE index of a cluster carrying 69 tones, and one null tone is mapped to an upper RE index, according to an embodiment.
  • the RB to which null tones are mapped can be set in reverse.
  • the X value may be defined in advance as a fixed value by the standard spec or some candidate values, or may be indicated / set by higher layer signaling (eg, RRC signaling, MAC-CE, etc.) and / or DCI. Alternatively, the X value may be set / defined / instructed differently according to the set SCS (eg, numerology).
  • the X value (eg, cluster interval) may be set to a value greater than the frequency interval considered in the PSD constraint defined in PSD regulation.
  • the X value (eg, cluster interval) may be set / defined larger than at least 1 MHz. Accordingly, the maximum PRACH transmission power can be increased compared to the prior art.
  • the X value may be set / determined in consideration of a PUSCH / PUCCH / SRS (Sounding Reference Signal) that can be PRACH and FDM in a slot in which the corresponding PRACH is transmitted.
  • a PUSCH / PUCCH / SRS Sounding Reference Signal
  • the X value may be the same as W or set / determined to one of multiples of W.
  • 26 is a diagram briefly showing an example of a second interlaced PRACH configuration disclosed in this document.
  • some RBs include 11 tones to which sequences are mapped, and some other RBs (eg, 7). RBs) may include 12 tones to which sequences are mapped.
  • any RB of 12 RBs may include 11 or 12 tones to which a sequence is mapped.
  • a mapping rule that determines how many tones in a RB a sequence is mapped to is defined in advance by a standard spec or other signaling (eg, RRC signaling, DCI, etc.). Can be.
  • the RE position in which the null tone is located can be variously set.
  • the null tone may be mapped to the lower RE index in the corresponding RB or the upper RE index.
  • a position to which a null tone in the corresponding RB is mapped may be previously defined by a standard spec or the like, or set / definition / instructed by separate signaling (eg, RRC signaling, DCI, etc.).
  • Cluster interval X value can be set / determined differently according to SCS. For example, if the SCS is 15 kHz, the X value may be set to 8, if the SCS is 30 kHz, the X value may be set to 4, and if the SCS is 60 kHz, the X value may be set to 2.
  • PUSCH / PUCCH / SRS transmitted in an unlicensed band may also have an interlace structure, similar to PRACH.
  • the PUSCH / PUCCH / SRS that is FDM with the PRACH may be set to have the same interlace configuration as the PRACH.
  • PUCCH / PUSCH / SRS in a slot other than a RACH occasion (or RACH slot) may have an interlace structure with a cluster interval of 10
  • PUCCH / PUSCH / SRS in a slot that is a RACH occasion (or RACH slot). May have an interlace structure with a cluster interval of 8.
  • the maximum number of PRACH occasions that can be configured on the frequency axis may be limited / set to X, which is a cluster interval (or number of interlaces).
  • FIG. 27 is a diagram briefly showing an example of a third interlaced PRACH configuration disclosed in this document.
  • some clusters include 14 tones to which sequences are mapped
  • some other clusters eg, 1) cluster
  • any cluster of 10 clusters may include 14 or 13 tones to which a sequence is mapped.
  • a mapping rule that determines how many tones in a cluster are mapped to a sequence is defined in advance by standard specifications, or set / definition / instruction by separate signaling (eg, RRC signaling, DCI, etc.) Can be.
  • the RE position in which the null tone is located can also be variously set.
  • a mapping rule that determines whether Null tones maps relatively much to a lower RE index in a corresponding cluster or upper RE index in a corresponding cluster is defined in advance according to a standard spec, etc.
  • Example: RRC signaling, DCI, etc. may be set / defined / directed.
  • Cluster interval X value can be set / determined differently according to SCS. For example, if the SCS is 15 kHz, the X value is set to 9, if the SCS is 30 kHz, the X value is set to 4, and if the SCS is 60 kHz, the X value can be set to 1.5 or 1 or 2.
  • PUSCH / PUCCH / SRS transmitted in an unlicensed band may also have an interlace structure, similar to PRACH.
  • the PUSCH / PUCCH / SRS that is FDM with the PRACH may be set to have the same interlace configuration as the PRACH.
  • the maximum number of PRACH occasions that can be configured on the frequency axis may be set to (X + 1) / 2 (or floor ⁇ (k + 1) / 2 ⁇ ), which is a cluster interval (or number of interlaces).
  • an X value may be determined in consideration of a PUSCH / PUCCH / SRS that can be FDM and PRACH in a slot in which the corresponding PRACH is transmitted. For example, when the cluster interval such as interlacing-based PUSCH / PUCCH / SRS is W RBs, the X value may be set / determined to be the same as W or a multiple of W.
  • FIG. 28 is a diagram briefly showing an example of a fourth interlaced PRACH configuration disclosed in this document.
  • some clusters include 7 tones to which sequences are mapped, and some other clusters (eg, 1) cluster) may include six tones to which a sequence is mapped.
  • any of the 20 clusters may include 7 or 6 tones to which a sequence is mapped.
  • the mapping rule that determines how many tones in a cluster to be mapped to a sequence is defined in advance by standard specifications, etc. or set / definition / instruction by separate signaling (eg, RRC signaling, DCI, etc.) Can be.
  • the RE position in which the null tone is located can also be variously set.
  • a mapping rule that determines whether Null tones maps relatively much to a lower RE index in a corresponding cluster or upper RE index in a corresponding cluster is defined in advance according to a standard spec, etc.
  • Example: RRC signaling, DCI, etc. may be set / defined / directed.
  • the cluster interval X value can be set / determined for each cluster. For example, in the case of an interval (N) between clusters having an even index, if SCS is 15 kHz, N is set to 10, if SCS is 30 kHz, N is set to 5, and if SCS is 60 kHz, N is 2.5 or 2 Or it can be set to 3. For the interval (M) between clusters with Odd index, M is set to 10 if SCS is 15 kHz, M is set to 5 if SCS is 30 kHz, and M is 2.5 or 2 or 3 if SCS is 60 kHz. Can be set.
  • the minimum interval between clusters with even index (eg cluster # 2n, n is an integer greater than or equal to 0) and clusters with next index (eg cluster # 2n + 1) is set to x, and odd index
  • the minimum interval between clusters with (eg cluster # 2n + 1) and clusters with the next index (eg cluster # 2n + 2) can be set to Lx.
  • SCS is 15 kHz
  • L is set to 10
  • SCS is 30 kHz
  • L is set to 5
  • SCS is 60 kHz
  • L may be set to 2.5 or 2 or 3.
  • the various interval value (s) are defined in advance by a standard spec, etc., or indicated / set by higher layer signaling (eg, RRC, MAC-CE, etc.) and / or DCI, or set differently according to SCS / Can be defined / directed.
  • higher layer signaling eg, RRC, MAC-CE, etc.
  • PUSCH / PUCCH / SRS transmitted in an unlicensed band may also have an interlace structure, similar to PRACH.
  • the PUSCH / PUCCH / SRS that is FDM with the PRACH may be set to have the same interlace configuration as the PRACH.
  • the maximum number of PRACH occasions that can be configured on the frequency axis may be set to floor ( ⁇ interval between clusters with even index ⁇ / 2).
  • an X value may be determined in consideration of a PRSCH and PUSCH / PUCCH / SRS that can be FDM in a slot in which the corresponding PRACH is transmitted. For example, when the cluster interval such as interlacing-based PUSCH / PUCCH / SRS is W RBs, the X value may be set / determined to be the same as W or a multiple of W.
  • 29 is a diagram briefly showing an example of a fifth interlaced PRACH configuration disclosed in this document.
  • some clusters include 14 tones to which sequences are mapped
  • some other clusters eg, 1) cluster
  • any cluster of 10 clusters may include 14 or 13 tones to which a sequence is mapped.
  • the mapping rule that determines how many tones in a cluster to be mapped to a sequence is defined in advance by standard specifications, etc. Can be.
  • mapping rule to be defined may be defined in advance by a standard spec, etc., or may be set / defined / instructed by separate signaling (eg, RRC signaling, DCI, etc.).
  • one cluster may be composed of a combination of 12 REs included in an even (or odd) index RB among consecutive 2 RBs and 6 REs among consecutive odd (or even) index RBs. Additionally, the remaining 6 REs among the odd (or even) index RBs may be configured with different RACH occasions or used for transmission of PUSCH / PUCCH / SRS.
  • the cluster interval X value can be set / determined for each cluster. For example, in the case of an interval (N) between clusters having an even index, if SCS is 15 kHz, N is set to 10, if SCS is 30 kHz, N is set to 5, and if SCS is 60 kHz, N is 2.5 or 2 Or it can be set to 3. For the interval (M) between clusters with Odd index, M is set to 10 if SCS is 15 kHz, M is set to 5 if SCS is 30 kHz, and M is 2.5 or 2 or 3 if SCS is 60 kHz. Can be set.
  • the minimum interval between clusters with even index (eg cluster # 2n, n is an integer greater than or equal to 0) and clusters with next index (eg cluster # 2n + 1) is set to x, and odd index
  • the minimum interval between clusters with (eg cluster # 2n + 1) and clusters with the next index (eg cluster # 2n + 2) can be set to Lx.
  • SCS is 15 kHz
  • L is set to 10
  • SCS is 30 kHz
  • L is set to 5
  • SCS is 60 kHz
  • L may be set to 2.5 or 2 or 3.
  • the various interval value (s) are defined in advance by a standard spec, etc., or indicated / set by higher layer signaling (eg, RRC, MAC-CE, etc.) and / or DCI, or set differently according to SCS / Can be defined / directed.
  • higher layer signaling eg, RRC, MAC-CE, etc.
  • PUSCH / PUCCH / SRS transmitted in an unlicensed band may also have an interlace structure, similar to PRACH.
  • the PUSCH / PUCCH / SRS that is FDM with the PRACH may be set to have the same interlace configuration as the PRACH.
  • the maximum number of PRACH occasions that can be configured on the frequency axis can be set to floor ( ⁇ interval between clusters with even index ⁇ /1.5).
  • an X value may be determined in consideration of a PRSCH and PUSCH / PUCCH / SRS that can be FDM in a slot in which the corresponding PRACH is transmitted. For example, when the cluster interval such as interlacing-based PUSCH / PUCCH / SRS is W RBs, the X value may be set / determined to be the same as W or a multiple of W.
  • the sixth interlaced PRACH configuration (the same interlace structure as PUSCH (and / or PUCCH / SRS) (eg, cluster size (R): 1 RB, number of clusters (C): 10), interlace index and (within interlace) RACH sequence is sequentially mapped according to RB index order)
  • the first RO consists of all 10 RBs in interlace index 0 and 2 RBs in interlace index 1
  • the second RO consists of the remaining 8 RBs in interlace index 1 and 4 RBs in interlace index 2.
  • the RACH sequence may be mapped in the order of RE index for 12 RBs constituting each RO.
  • the method of configuring the null tone in each cluster may be the same as the second interlaced PRACH configuration described above.
  • FIG. 30 is a diagram briefly showing an example of a configuration of a seventh interlaced PRACH disclosed in this document.
  • some clusters include 35 tones to which sequences are mapped, and some other clusters (eg 1) cluster) may include 34 tones to which a sequence is mapped.
  • any of the four clusters may include 34 or 35 tones to which the sequence is mapped.
  • the mapping rule that determines how many tones in a cluster to be mapped to a sequence is defined in advance by standard specifications, etc. Can be.
  • the RE position in which the null tone is located can be variously set.
  • the null tone may be mapped to the lower RE index in the corresponding cluster or the upper RE index.
  • a location where a null tone in a corresponding cluster is mapped may be previously defined by a standard spec or the like, or set / defined / indicated by separate signaling (eg, RRC signaling, DCI, etc.).
  • the cluster interval X value is defined in advance by a standard spec, etc., or is indicated / set by higher layer signaling (e.g., RRC signaling, MAC-CE, etc.) and / or DCI, or the value is set / defined differently according to SCS / Can be directed.
  • higher layer signaling e.g., RRC signaling, MAC-CE, etc.
  • DCI DCI
  • the cluster interval X value may be set to a value larger than the frequency interval considered in the PSD constraint defined in the PSD regulation.
  • the X value eg, cluster interval
  • the maximum PRACH transmission power can be increased compared to the prior art.
  • the X value may be set / determined in consideration of a PUSCH / PUCCH / SRS (Sounding Reference Signal) that can be PRACH and FDM in a slot in which the corresponding PRACH is transmitted.
  • a PUSCH / PUCCH / SRS Sounding Reference Signal
  • the X value may be the same as W or set / determined to one of multiples of W.
  • 31 is a diagram illustrating an example in which a plurality of RACH occasions are configured in a frequency domain.
  • a resource allocation method to be considered / set as one RACH resource and a PRACH transmission / reception operation based thereon will be described in detail.
  • the interval between ROs may be defined as a specific value in advance by a standard spec or the like, or may be set / directed by separate signaling (eg, RRC signaling, DCI, etc.) have.
  • the number of ROs constituting each RACH resource may be defined as a specific value in advance according to a standard spec or the like, or may be set / instructed by separate signaling (eg, RRC signaling, DCI, etc.). At this time, ROs constituting each RACH resource may be associated with the same SS / PBCH block index.
  • Y1 which is an interval between ROs, may mean an RB interval between n-th clusters for each RO.
  • Y1 3 when RO # 0 is interlace # 0/1 and RO # 2 is interlace # 3/4.
  • the signal / information transmitted through each step in the RACH process composed of 4 steps may be as follows.
  • Msg1 (eg, PRACH) signal: transmits information determined based on a time / frequency resource in which a PRACH preamble is transmitted and a transmitted preamble index
  • Msg2 e.g., RAR (random access response) PDSCH, corresponding RAR PDSCH is scheduled by PDCCH scrambling with RA-RNTI
  • PRACH preamble index PRACH preamble index
  • UL grant for Msg3 Temporary C-RNTI
  • TA command etc.
  • Msg3 (eg, PUSCH): transmits information such as UE (global) ID (and / or BSR (Buffer Status Report) information)
  • Msg4 (eg, PDSCH): transmits information such as a UE (global) ID (and / or RRC connection related information)
  • RA-RNTI value is determined based on a specific reference RO among ROs constituting RACH resource
  • RA-RNTI value is determined based on RACH resources
  • RO # 1 and RO # 2 constitutes one RACH resource # 1
  • RO # 3/4 constitutes another RACH resource # 2
  • RO # 1/2 It is assumed that the combination of / 3/4 constitutes another RACH resource # 3.
  • RACH resource # 1/3 may correspond to the first RA-RNTI value based on RO # 1
  • RACH resource # 2 may correspond to the second RA-RNTI value based on RO # 3.
  • f_id may be allocated / set for each RO and RACH resource (eg, Opt.2).
  • RO # 1, RO # 2, RO # 3, RO # 4, RACH resource # 1 (a combination of RO # 1 and RO # 2), RACH resource # 2 (a combination of RO # 3/4), and RACH A different f_id may be allocated for each resource # 3 (a combination of RO # 1/2/3/4).
  • PRACH preamble index is determined based on the reference RO preamble index set according to Section 3.2.1
  • PRACH preamble index is determined for each set of preamble indexes mapped to RACH resources
  • RO # 1 and RO # 2 are set / defined as one RACH resource # 1, and the RA-RNTI value is determined based on RO # 1 as a reference RO.
  • RO # 1 corresponds to preamble index # A
  • RO # 2 is set to correspond to preamble index # B
  • PRACH preamble transmitted from RACH resource # 1 is reference RO It can be determined by the preamble index #A corresponding to # 1.
  • the number of PRACH preambles allocated to RO # 1 is 64 and the number of PRACH preambles allocated to RO # 2 is 64.
  • N PRACH preambles are set in RACH resource # 1
  • PRACH preambles that can be transmitted only in RO # 1 can be set as PRACH preambles other than preamble # X_m among 64 (eg, 64-N PRACH preambles), and PRACHs that can be transmitted only in RO # 2
  • the preamble may be set as PRACH preambles other than preamble # Y_m out of 64 (eg, 64N PRACH preambles).
  • the number of PRACH preambles that can be transmitted in RACH resource # 1 (including RO # 1 only and RO # 2 only) is 64 in total, and the index of each PRACH preamble is the corresponding RACH resource It can be determined by the preamble index corresponding to.
  • the UE may select the RACH resource based on parameters such as RSRP (reference signal received power) value or PRACH preamble retransmission number.
  • RSRP reference signal received power
  • a combination of RO # 1 and RO # 2 is defined / set as one RACH resource # 1 and a combination of RO # 1/2/3/4 as another RACH resource # 2.
  • the RACH resource may be selected / set according to the following rules:
  • a RACH resource including a single RO is selected
  • RACH resource # 1 a RACH resource including two ROs (eg, RACH resource # 1) is selected
  • RACH resource # 2 a RACH resource including four ROs (eg, RACH resource # 2) is selected
  • a rule may be set / defined to select RACH resources including more ROs. This is because the larger the number of retransmissions, the larger the RACH transmission power of the terminal.
  • the RACH resource may be selected / set according to the following rules:
  • a RACH resource including a single RO is selected
  • RACH resource # 1 If the number of retransmissions is more than N1 and less than N2, a RACH resource including two ROs (eg, RACH resource # 1) is selected
  • RACH resources including four ROs are selected.
  • different SCSs may be set according to whether the PRACH preamble transmission of the UE is a signal transmission of the first step of the 2-step RACH procedure or Msg1 transmission of the 4-step RACH procedure.
  • the 2-step RACH procedure means that Msg1 and Msg3 among Msg1 to Msg4 of the 4-step RACH procedure are transmitted in the first step (for convenience of description, the corresponding signal is named Msg A), and a response message is generated. Through this, it may mean a series of processes in which the RACH procedure is completed.
  • a PRACH format of a relatively large SCS (eg, 30 kHz) may be allocated to minimize the amount of time axis resource through which the RACH is transmitted.
  • a relatively small SCS (eg, 15 kHz) may be set for Msg 3 in consideration of transmission power efficiency.
  • Msg1 and Msg3 may be transmitted together with frequency division multiplexing (FDM) or time division multiplexing (TDM). Accordingly, the same SCS can be set for Msg1 and Msg3 for a 2-step RACH procedure.
  • FDM frequency division multiplexing
  • TDM time division multiplexing
  • different SCSs are set for the specific slot according to whether a specific slot is a slot to which Msg A transmission for a 2-step RACH procedure is allocated or a Msg 1 transmission for a 4-step RACH procedure is allocated.
  • the first SCS for the slot to which the Msg A transmission for the 2-step RACH procedure is allocated eg, 15 kHz
  • the second SCS for the slot to which the Msg 1 transmission for the 4-step RACH procedure is allocated eg : 30 kHz.
  • SCS for a slot allocated for transmission of a PRACH preamble (eg 30 kHz) is SCS allocated for a UL channel / signal (eg PUSCH / PUCCH / SRS) (eg 15 kHz) ).
  • the terminal may operate as follows.
  • the UE may perform SCS (allocated for UL channel / signal) (for example, PRACH preamble transmission or other UL channel / signal transmission, etc.) in the corresponding slot, as in other slots. 15 kHz) can be applied (Method 1).
  • SCS allocated for UL channel / signal
  • PRACH preamble transmission or other UL channel / signal transmission, etc. for example, PRACH preamble transmission or other UL channel / signal transmission, etc.
  • 15 kHz 15 kHz
  • the UE may recognize that the UL channel / signal transmission / assignment / configuration (other than the PRACH preamble) is not expected or invalid on the corresponding slot (Method 2).
  • the UE may transmit the UL channel / signal (other than the PRACH preamble) by changing the numerology to the SCS (eg, 30 kHz) allocated to the corresponding slot Method 3).
  • the numerology to the SCS eg, 30 kHz
  • the RB index set as a reference may have a many: 1 relationship. Accordingly, in Method 3, according to the RB in which the UL channel / signal is scheduled, the UE may transmit the scheduled UL channel / signal using only some REs (or subcarriers) in the RB set as the second SCS reference.
  • the UE may even (or odd) RE of RB # N. (Or subcarrier) can be configured to transmit the PUCCH only on the index.
  • FIG. 32 is a diagram showing an example of an operation of a terminal (UE) and a base station (BS) disclosed in this document
  • FIG. 33 is a flowchart of an operation of a terminal according to an example disclosed in this document
  • FIG. It is an operation flowchart of a base station according to an example.
  • the UE on the basis of that one RA resource includes a plurality of physical random access channels (PRACH occasion; RO), PRACH through a specific RA resource among a plurality of RA resources on the unlicensed band
  • PRACH occasion PRACH occasion
  • RO physical random access channels
  • the signal is transmitted to the base station (S3210, S3310).
  • the base station receives the PRACH signal from the terminal through the specific RA resource among the plurality of RA resources on the unlicensed band (S3210, S3410).
  • the PRACH signal may be transmitted based on a random access-radio network temporary identifier (RA-RNTI) determined based on one of the following.
  • RA-RNTI random access-radio network temporary identifier
  • the RA-RNTI may be determined based on a parameter having an integer value of 0 to 7.
  • the parameter may have one of the following values.
  • the reference RO among the plurality of ROs may correspond to one of the following.
  • the specific RA resource among the plurality of RA resources may be determined based on at least one of the following.
  • RSRP reference signal received power
  • the specific RA resource among the plurality of RA resources is determined based on the RSRP of the corresponding SS / PBCH block, the smaller the RSRP value, the greater the number of ROs the specific RA resource has. It can be determined by including RA resources.
  • the specific RA resource among the plurality of RA resources is determined based on the number of retransmissions of the PRACH preamble
  • the specific RA resource includes more ROs as the number of retransmissions of the PRACH preamble increases. Can be determined as an RA resource.
  • the terminal when the terminal transmits the PRACH signal through a specific RA resource among a plurality of RA resources on the unlicensed band, the terminal is a channel access procedure (CAP access procedure) for the specific RA resource It may include transmitting the PRACH signal through a specific RA resource among a plurality of RA resources on the pre-licensed band based on).
  • CAP access procedure channel access procedure
  • the terminal receives a random access response (RAR) message scrambled with the RA-RNTI from the base station through the unlicensed band (S3220, S3320).
  • RAR random access response
  • the base station transmits the RAR message to the terminal through the unlicensed band (S3220, S3420).
  • the RAR message may include PRACH index information related to the PRACH signal.
  • the PRACH index information may include one of the following.
  • the terminal may transmit a physical uplink shared channel (PUSCH) signal to the base station in response to the RAR message (S3230, S3330).
  • the base station may receive the PUSCH signal from the terminal (S3230, S3430).
  • the PUSCH signal may be transmitted and received through an unlicensed band or a licensed band.
  • the UE at least one of a physical downlink control channel (PDCCH) signal (S3242) or a physical downlink shared channel (PDSCH) signal (S3244) in response to the PUSCH signal.
  • PDCCH physical downlink control channel
  • PDSCH physical downlink shared channel
  • the terminal may perform a contention resolution procedure based on the received signal, where contention resolution for the RA procedure is considered successful (S3240).
  • the UE may receive a PDCCH transmission being addressed to the C-RNTI (CDCRN) transmitted to the C-RNTI, and based on this, It can be assumed that resolving the competition is a success.
  • C-RNTI cell specific RNTI
  • CDCRN C-RNTI
  • the UE receives PDCCH transmission being addressed to TEMPORARY_C-RNTI, which is transmitted as a temporary C-RNTI (eg, TEMPORARY_C-RNTI), and the PDCCH PDSCH (or MAC medium access control protocol data unit (PDU)) may be received, and based on this, it may be assumed that resolution is successful.
  • TEMPORARY_C-RNTI e.g, TEMPORARY_C-RNTI
  • PDCCH PDSCH or MAC medium access control protocol data unit (PDU)
  • the base station may transmit at least one of PDCCH signals (S3242, S3440) or PDSCH signals (S3244, S3450) to the terminal.
  • PDCCH signals S3242, S3440
  • PDSCH signals S3244, S3450
  • each of the PDCCH signal or the PDSCH signal may be transmitted and received through a licensed band or an unlicensed band.
  • the terminal may transmit a PRACH signal to the base station multiple times. In other words, after transmitting the PRACH signal to the base station, the terminal may transmit an additional PRACH signal to the base station if it does not receive a response signal for the PRACH signal for a certain period of time. The above operation may be repeatedly performed until a response signal for the PRACH signal transmitted by the terminal is received.
  • the first RA resource candidate for the UE to transmit the first PRACH signal and the second RA resource candidate for the UE to transmit the additional PRACH signal (or retransmission PRACH signal) may be different.
  • the first RA resource candidate is set to RA resource (s) including a single RO as well as RA resources including a plurality of ROs, while the second RA resource candidate is only RA resources including a plurality of ROs. Can be set.
  • the RA resource selection method for the initial PRACH signal and the RA resource selection method for the additional PRACH signal may be different.
  • the RA resource for the additional PRACH signal is one of the RA resources including a plurality of ROs. Can only be selected as a RA resource.
  • the RA resource for the initial PRACH signal is set to any one RA resource including a single RO, while the RA resource for the additional PRACH signal (or retransmission PRACH signal) increases the number of ROs as the number of retransmissions increases. It may be set to any one RA resource including (for example, if the number of retransmissions is 2 or more and less than 4, one RA resource including 2 ROs is selected, and if the number of retransmissions is 4 or more, which includes 4 ROs) One RA resource is selected, etc.)
  • the terminal may receive an RAR message from the base station.
  • the characteristics of the RAR message and subsequent operation examples may be applied to the methods disclosed in the above-described examples.
  • the examples of the proposed method described above can also be included as one of the implementation methods of the examples of the present description, and thus can be regarded as a kind of proposed methods. Further, the above-described proposed schemes may be implemented independently, but may also be implemented in a combination (or merged) form of some suggested schemes. Whether the application of the proposed methods is applied (or information on the rules of the proposed methods) can be defined so that the base station notifies the UE through a predefined signal (eg, a physical layer signal or a higher layer signal). have.
  • a predefined signal eg, a physical layer signal or a higher layer signal.
  • 35 illustrates a communication system 1 applied to the examples of this disclosure.
  • the communication system 1 applied to the examples of the present description includes a wireless device, a base station and a network.
  • the wireless device means a device that performs communication using a wireless access technology (eg, 5G NR (New RAT), Long Term Evolution (LTE)), and may be referred to as a communication / wireless / 5G device.
  • a wireless access technology eg, 5G NR (New RAT), Long Term Evolution (LTE)
  • LTE Long Term Evolution
  • the wireless device includes a robot 100a, a vehicle 100b-1, 100b-2, an XR (eXtended Reality) device 100c, a hand-held device 100d, and a home appliance 100e. ), An Internet of Thing (IoT) device 100f, and an AI device / server 400.
  • IoT Internet of Thing
  • the vehicle may include a vehicle equipped with a wireless communication function, an autonomous driving vehicle, a vehicle capable of performing inter-vehicle communication, and the like.
  • the vehicle may include a UAV (Unmanned Aerial Vehicle) (eg, a drone).
  • XR devices include Augmented Reality (AR) / Virtual Reality (VR) / Mixed Reality (MR) devices, Head-Mounted Device (HMD), Head-Up Display (HUD) provided in vehicles, televisions, smartphones, It may be implemented in the form of a computer, wearable device, home appliance, digital signage, vehicle, robot, or the like.
  • the mobile device may include a smart phone, a smart pad, a wearable device (eg, a smart watch, smart glasses), a computer (eg, a notebook, etc.).
  • Household appliances may include a TV, a refrigerator, and a washing machine.
  • IoT devices may include sensors, smart meters, and the like.
  • the base station and the network may also be implemented as wireless devices, 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 to 100f may communicate with each other through the base station 200 / network 300, but may directly communicate (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 other IoT devices (eg, sensors) or other wireless devices 100a to 100f.
  • Wireless communication / connections 150a, 150b, and 150c may be achieved between the wireless devices 100a to 100f / base station 200 and the base station 200 / base station 200.
  • the wireless communication / connection is various wireless access such as uplink / downlink communication 150a and sidelink communication 150b (or D2D communication), base station communication 150c (eg relay, IAB (Integrated Access Backhaul)). It can be achieved through technology (eg, 5G NR), and wireless devices / base stations / wireless devices, base stations and base stations can transmit / receive radio signals to each other through wireless communication / connections 150a, 150b, 150c.
  • wireless communication / connections 150a, 150b, 150c may transmit / receive signals over various physical channels
  • transmission / reception of wireless signals based on various proposals of the examples of the present disclosure, transmission / reception of wireless signals.
  • various configuration information setting processes e.g, channel encoding / decoding, modulation / demodulation, resource mapping / demapping, etc.
  • resource allocation processes may be performed.
  • 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 ⁇ are ⁇ wireless device 100x, base station 200 ⁇ and / or ⁇ wireless device 100x), wireless device 100x in FIG. 35. ⁇ .
  • 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 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 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 wireless 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 connected to the processor 102 and may store various information related to the operation of the processor 102.
  • the memory 104 is an instruction to perform some or all of the processes controlled by the processor 102, or to perform the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed herein. You can store software code that includes
  • the processor 102 and the memory 104 may be part of a communication modem / circuit / chip designed to implement wireless communication technology (eg, LTE, NR).
  • the transceiver 106 can be coupled to the processor 102 and can transmit and / or receive wireless signals through one or more antennas 108.
  • the transceiver 106 may include a transmitter and / or receiver.
  • the transceiver 106 may be mixed with a radio frequency (RF) unit.
  • RF radio frequency
  • the wireless device may mean a communication modem / circuit / chip.
  • the second wireless device 200 includes 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.
  • Processor 202 controls memory 204 and / or 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 information in the memory 204 to generate third information / signal, and then transmit a wireless signal including the third information / signal through the transceiver 206.
  • the processor 202 may receive the wireless signal including the fourth information / signal through the transceiver 206 and store the 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 may store various information related to the operation of the processor 202.
  • the memory 204 is an instruction to perform some or all of the processes controlled by the processor 202, or to perform the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed herein. You can store software code that includes
  • the processor 202 and the memory 204 may be part of a communication modem / circuit / chip designed to implement wireless communication technology (eg, LTE, NR).
  • the transceiver 206 can be coupled to the processor 202 and can transmit and / or receive wireless signals through one or more antennas 208.
  • Transceiver 206 may include a transmitter and / or receiver.
  • Transceiver 206 may be mixed with an RF unit.
  • the wireless device may mean a communication modem / circuit / chip.
  • one or more protocol layers may be implemented by one or more processors 102 and 202.
  • one or more processors 102, 202 may implement one or more layers (eg, functional layers such as PHY, MAC, RLC, PDCP, RRC, SDAP).
  • the one or more processors 102 and 202 may include one or more Protocol Data Units (PDUs) and / or one or more Service Data Units (SDUs) according to the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed herein. Can be created.
  • PDUs Protocol Data Units
  • SDUs Service Data Units
  • the one or more processors 102, 202 may generate messages, control information, data or information according to the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed herein.
  • the one or more processors 102, 202 generate signals (eg, baseband signals) including PDUs, SDUs, messages, control information, data or information according to the functions, procedures, suggestions and / or methods disclosed herein. , To one or more transceivers 106, 206.
  • One or more processors 102, 202 may receive signals (eg, baseband signals) from one or more transceivers 106, 206, and descriptions, functions, procedures, suggestions, methods and / or operational flow diagrams disclosed herein PDUs, SDUs, messages, control information, data or information may be obtained according to the fields.
  • signals eg, baseband signals
  • One or more processors 102, 202 may be referred to as a controller, microcontroller, microprocessor, or microcomputer.
  • the 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
  • Descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed in this document may be implemented using firmware or software, and 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 are either firmware or software set to perform or are stored in one or more processors 102, 202, or stored in one or more memories 104, 204. It can be driven by the above processors (102, 202).
  • the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed herein can be implemented using firmware or software in the form of code, instructions and / or instructions.
  • One or more memories 104, 204 may be coupled to one or more processors 102, 202, and may store various types of data, signals, messages, information, programs, codes, instructions, and / or instructions.
  • the one or more memories 104, 204 may be comprised of ROM, RAM, EPROM, flash memory, hard drive, register, cache memory, computer readable storage medium and / or combinations thereof.
  • the one or more memories 104, 204 may be located inside and / or outside of the one or more processors 102, 202. Also, the one or more memories 104 and 204 may be connected to the one or more processors 102 and 202 through various technologies such as a wired or wireless connection.
  • the one or more transceivers 106 and 206 may transmit user data, control information, radio signals / channels, and the like referred to in the methods and / or operational flowcharts of the present document to one or more other devices.
  • the one or more transceivers 106, 206 may receive user data, control information, radio signals / channels, and the like referred to in the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed herein from one or more other devices. have.
  • one or more transceivers 106, 206 may be coupled to one or more processors 102, 202, and may transmit and receive wireless signals.
  • one or more processors 102, 202 can control one or more transceivers 106, 206 to transmit user data, control information, or wireless signals to one or more other devices. Additionally, the one or more processors 102, 202 may control one or more transceivers 106, 206 to receive user data, control information, or wireless signals from one or more other devices. In addition, one or more transceivers 106, 206 may be coupled to one or more antennas 108, 208, and one or more transceivers 106, 206 may be described, functions described herein through one or more antennas 108, 208.
  • the one or more antennas may be a plurality of physical antennas or a plurality of logical antennas (eg, antenna ports).
  • the one or more transceivers 106 and 206 process the received user data, control information, radio signals / channels, etc. using one or more processors 102, 202, and receive radio signals / channels from the RF band signal. It can be converted to a baseband signal.
  • the one or more transceivers 106 and 206 may convert user data, control information, and radio signals / channels processed using one or more processors 102 and 202 from a baseband signal to an RF band signal.
  • the one or more transceivers 106, 206 may include (analog) oscillators and / or filters.
  • the wireless device may be implemented in various forms according to use-example / service (see FIG. 35).
  • the wireless devices 100 and 200 correspond to the wireless devices 100 and 200 of FIG. 36, and various elements, components, units / units, and / or modules ).
  • the wireless devices 100 and 200 may include a communication unit 110, a control unit 120, a memory unit 130, and additional elements 140.
  • the communication unit may include a communication circuit 112 and a transceiver (s) 114.
  • the communication circuit 112 can include one or more processors 102,202 and / or one or more memories 104,204 of FIG.
  • the transceiver (s) 114 may include one or more transceivers 106,206 and / or one or more antennas 108,208 of FIG. 36.
  • the control unit 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 information stored in the memory unit 130 to the outside (eg, another communication device) through the wireless / wired interface through the communication unit 110, 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, another communication device
  • 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 variously configured according to the type of wireless device.
  • the additional element 140 may include at least one of a power unit / battery, an input / output unit (I / O unit), a driving unit, and a computing unit.
  • wireless devices include robots (FIGS. 35, 100A), vehicles (FIGS. 35, 100B-1, 100B-2), XR devices (FIGS. 35, 100C), portable devices (FIGS. 35, 100D), and household appliances. (Fig. 35, 100e), IoT device (Fig.
  • the wireless device may be movable or used in a fixed place depending on the use-example / service.
  • various elements, components, units / parts, and / or modules in the wireless devices 100 and 200 may be entirely interconnected through a wired interface, or at least a portion may be wirelessly connected through the communication unit 110.
  • the control unit 120 and the communication unit 110 are connected by wire, 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 the wireless devices 100 and 200 may further include one or more elements.
  • the controller 120 may be composed of one or more processor sets.
  • control unit 120 may include a set of communication control processor, application processor, electronic control unit (ECU), graphic processing processor, and memory control processor.
  • memory unit 130 includes random access memory (RAM), dynamic RAM (DRAM), read only memory (ROM), flash memory, volatile memory, and non-volatile memory (non- volatile memory) and / or combinations thereof.
  • the portable device may include a smart phone, a smart pad, a wearable device (eg, a smart watch, smart glasses), and a portable computer (eg, a notebook).
  • the mobile device may be referred to as a mobile station (MS), a user terminal (UT), a mobile subscriber station (MSS), a subscriber station (SS), an advanced mobile station (AMS), or a wireless terminal (WT).
  • MS mobile station
  • UT user terminal
  • MSS mobile subscriber station
  • SS subscriber station
  • AMS advanced mobile station
  • WT wireless terminal
  • the portable device 100 includes an antenna unit 108, a communication unit 110, a control unit 120, a memory unit 130, a power supply unit 140a, an interface unit 140b, and an input / output unit 140c. ).
  • the antenna unit 108 may be configured as a part of the communication unit 110.
  • Blocks 110 to 130 / 140a to 140c correspond to blocks 110 to 130/140 in FIG. 37, respectively.
  • the communication unit 110 may transmit and receive signals (eg, data, control signals, etc.) with other wireless devices and base stations.
  • the control unit 120 may perform various operations by controlling components of the portable device 100.
  • the controller 120 may include an application processor (AP).
  • the memory unit 130 may store data / parameters / programs / codes / instructions required for driving the portable device 100. Also, the memory unit 130 may store input / output data / information.
  • the power supply unit 140a supplies power to the portable device 100 and may include a wired / wireless charging circuit, a battery, and the like.
  • the interface unit 140b may support the connection between the mobile device 100 and other external devices.
  • the interface unit 140b may include various ports (eg, audio input / output ports, video input / output ports) for connection with external devices.
  • the input / output unit 140c may receive or output image information / signal, audio information / signal, data, and / or information input from a user.
  • the input / output unit 140c may include a camera, a microphone, a user input unit, a display unit 140d, a speaker, and / or a haptic module.
  • the input / output unit 140c acquires information / signal (eg, touch, text, voice, image, video) input from the user, and the obtained information / signal is transmitted to the memory unit 130 Can be saved.
  • the communication unit 110 may convert information / signals stored in the memory into wireless signals, and transmit the converted wireless signals directly to other wireless devices or to a base station.
  • the communication unit 110 may restore the received radio signal to original information / signal. After the restored information / signal is stored in the memory unit 130, it can be output in various forms (eg, text, voice, image, video, heptic) through the input / output unit 140c.
  • Vehicles or autonomous vehicles can be implemented as mobile robots, vehicles, trains, aerial vehicles (AVs), ships, and the like.
  • the vehicle or autonomous vehicle 100 includes 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 a part of the communication unit 110.
  • Blocks 110/130 / 140a-140d correspond to blocks 110/130/140 in FIG. 38, respectively.
  • the communication unit 110 may transmit and receive signals (eg, data, control signals, etc.) with external devices such as other vehicles, a base station (e.g. base station, road side unit, etc.) and a server.
  • the controller 120 may perform various operations by controlling elements of the vehicle or the autonomous vehicle 100.
  • the controller 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 driving unit 140a may include an engine, a motor, a power train, wheels, brakes, and steering devices.
  • 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, and a vehicle forward / Reverse sensor, battery sensor, fuel sensor, tire sensor, steering sensor, temperature sensor, humidity sensor, ultrasonic sensor, illumination sensor, pedal position sensor, and the like.
  • the autonomous driving unit 140d maintains a driving lane, automatically adjusts speed, such as adaptive cruise control, and automatically moves along a predetermined route, and automatically sets a route when a destination is set. Technology, etc. can be implemented.
  • 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 acquired data.
  • the controller 120 may control the driving unit 140a such that the vehicle or the autonomous vehicle 100 moves along the autonomous driving path according to a driving plan (eg, speed / direction adjustment).
  • a driving plan eg, speed / direction adjustment.
  • the communication unit 110 may acquire the latest traffic information data non-periodically from an external server, and acquire surrounding traffic information data from nearby vehicles.
  • the sensor unit 140c may acquire vehicle status and surrounding environment information.
  • the autonomous driving unit 140d may update the autonomous driving route and driving plan based on newly acquired data / information.
  • the communication unit 110 may transmit information regarding a vehicle location, an autonomous driving route, and a driving plan to an external server.
  • the external server may predict traffic information data in advance using AI technology or the like based on the information collected from the vehicle or autonomous vehicles, and provide the predicted traffic information data to the vehicle or autonomous vehicles.
  • the examples of the present description can be applied to various wireless access systems.
  • Examples of various wireless access systems include 3GPP (3rd Generation Partnership Project) or 3GPP2 system.
  • the examples of the present description can be applied not only to the various wireless access systems, but also to all technical fields to which the various wireless access systems are applied.
  • the proposed method can be applied to mmWave communication systems using ultra-high frequency bands.
  • the proposed method can also be applied to a vehicle communication system or an autonomous driving system to which the above-described radio access system is applied.

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

Abstract

Le présent document concerne un procédé pour une procédure d'accès aléatoire destiné à un terminal dans un système de communication sans fil prenant en charge une bande sans licence, et des dispositifs prenant en charge ledit procédé. À titre d'exemples spécifiques, le présent document comprend des exemples de fonctionnement d'un procédé de détermination de divers paramètres (par exemple, un identifiant temporaire de réseau d'accès aléatoire (RA-RNTI), une ressource de RA, un indice de préambule de canal d'accès aléatoire physique (PRACH), etc.) pour transmettre un préambule de PRACH sur une bande sans licence, et un terminal et une station de base basés sur ceux-ci.
PCT/KR2019/012276 2018-09-21 2019-09-20 Procédé pour procédure d'accès aléatoire pour un terminal dans un système de communication sans fil prenant en charge une bande sans licence, et dispositifs le prenant en charge WO2020060315A1 (fr)

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KR10-2018-0114477 2018-09-21
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KR10-2019-0003574 2019-01-10

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CN114390717A (zh) * 2020-10-16 2022-04-22 展讯通信（上海）有限公司 一种随机接入方法、装置及计算机可读存储介质
CN115428573A (zh) * 2020-08-06 2022-12-02 Lg电子株式会社 在无线通信系统中发送和接收无线信号的方法和设备
EP4221421A4 (fr) * 2020-10-08 2024-03-13 Lg Electronics Inc Procédé et dispositif d'émission et de réception d'un signal dans un système de communication sans fil
WO2024078434A1 (fr) * 2022-10-14 2024-04-18 上海朗帛通信技术有限公司 Procédé et appareil utilisés dans un nœud de communication pour une communication radio

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Cited By (7)

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Publication number Priority date Publication date Assignee Title
WO2022027054A1 (fr) * 2020-07-31 2022-02-03 Qualcomm Incorporated Attribution de tonalité de réduction de pic
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CN115428573A (zh) * 2020-08-06 2022-12-02 Lg电子株式会社 在无线通信系统中发送和接收无线信号的方法和设备
EP4221421A4 (fr) * 2020-10-08 2024-03-13 Lg Electronics Inc Procédé et dispositif d'émission et de réception d'un signal dans un système de communication sans fil
CN114390717A (zh) * 2020-10-16 2022-04-22 展讯通信（上海）有限公司 一种随机接入方法、装置及计算机可读存储介质
CN114245471A (zh) * 2022-02-28 2022-03-25 成都爱瑞无线科技有限公司 随机接入信号处理方法、随机接入方法、装置及存储介质
WO2024078434A1 (fr) * 2022-10-14 2024-04-18 上海朗帛通信技术有限公司 Procédé et appareil utilisés dans un nœud de communication pour une communication radio

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