WO2020060370A1 - Procédé de réglage de taille de fenêtre de contention pour l'accès d'un terminal à un canal dans une bande sans licence, et appareil le mettant en oeuvre - Google Patents

Procédé de réglage de taille de fenêtre de contention pour l'accès d'un terminal à un canal dans une bande sans licence, et appareil le mettant en oeuvre Download PDF

Info

Publication number
WO2020060370A1
WO2020060370A1 PCT/KR2019/012358 KR2019012358W WO2020060370A1 WO 2020060370 A1 WO2020060370 A1 WO 2020060370A1 KR 2019012358 W KR2019012358 W KR 2019012358W WO 2020060370 A1 WO2020060370 A1 WO 2020060370A1
Authority
WO
WIPO (PCT)
Prior art keywords
terminal
transmission
base station
channel
data
Prior art date
Application number
PCT/KR2019/012358
Other languages
English (en)
Korean (ko)
Inventor
명세창
김선욱
박창환
안준기
양석철
Original Assignee
엘지전자 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 엘지전자 주식회사 filed Critical 엘지전자 주식회사
Publication of WO2020060370A1 publication Critical patent/WO2020060370A1/fr

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • 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
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/04—Error control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/22—TPC being performed according to specific parameters taking into account previous information or commands
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA

Definitions

  • the present disclosure relates to wireless communication, and more particularly, to a contention window sizing method for a terminal to access a channel in an unlicensed band and an apparatus using the method.
  • next-generation wireless access technology As more communication devices require a larger communication capacity, there is a need for improved mobile broadband communication compared to a conventional radio access technology (RAT).
  • MTC Massive Machine Type Communications
  • NR Ultra-Reliable and Low Latency Communication
  • LTE long term evolution
  • NR NR systems
  • unlicensed bands such as the 2.4 gigahertz (GHz) band, which is mainly used by existing Wi-Fi systems, or 5 GHz, which is attracting attention.
  • GHz gigahertz
  • the unlicensed band assumes a method of transmitting and receiving wirelessly through competition between each communication node. Therefore, it is checked that other communication nodes do not transmit signals by performing channel sensing before each communication node transmits a signal. Is asking. For convenience, such an operation is called a listen before talk (LBT) or a channel access procedure (CBT). In particular, an operation for checking whether another communication node transmits a signal is carrier sensing (CS), another communication node. It is defined that clear channel assessment (CCA) has been confirmed when it is determined that the signal is not transmitted.
  • LBT listen before talk
  • CBT channel access procedure
  • CS carrier sensing
  • CCA clear channel assessment
  • the terminal may receive feedback for the uplink data. At this time, it is necessary to clearly define how the feedback should be received.
  • the technical problem to be solved by the present disclosure is to provide a contention window size adjustment method for a terminal to access a channel in an unlicensed band and an apparatus using the method.
  • a method of adjusting a contention window size for a terminal to access a channel in an unlicensed band transmits data from a preset resource to a base station, attempts to detect feedback for the data for a specific time, and if the feedback is not detected within the specific time, determines whether the unlicensed band is connected to the channel.
  • the size of the contention window used is adjusted, but a timer value used to determine the specific time is set by the base station.
  • the terminal provided in another aspect includes a transceiver that transmits and receives a radio signal and a processor operating in combination with the transceiver, wherein the processor transmits data from a preset resource to the base station, and the data It attempts to detect feedback for a certain time, and if the feedback is not detected within the specific time, adjusts the size of the contention window used to determine whether to access the unlicensed band to the channel, but uses it to determine the specific time Characterized in that the timer value is set by the base station.
  • a processor for a wireless communication device controls the wireless communication device, transmits data from a preset resource to a base station, attempts to detect feedback for the data for a specific time, and the specific time If the feedback is not detected within, the size of the contention window used to determine whether to access the unlicensed band to the channel is adjusted, but a timer value used to determine the specific time is set by the base station.
  • NR various services can be provided to terminals of various capabilities. This is also true in the unlicensed band of NR. Depending on the capabilities of the base station and the terminal, the processing power / time of the data may be different, which may indicate a greater difference in NR. In this disclosure, the characteristics of such NR are considered. That is, when feedback on uplink data is not received for a specific time, in the process of adjusting the size of the contention window, channel access in an unlicensed band can be seen by allowing the base station to independently set the specific time according to the characteristics of each terminal. It can be done efficiently.
  • FIG. 1 illustrates a wireless communication system to which the present disclosure can be applied.
  • FIG. 2 is a block diagram showing a radio protocol architecture for a user plane.
  • 3 is a block diagram showing a radio protocol structure for a control plane.
  • FIG. 4 shows another example of a wireless communication system to which the technical features of the present disclosure can be applied.
  • 5 illustrates functional division between NG-RAN and 5GC.
  • FIG. 6 illustrates a frame structure that can be applied in NR.
  • 9 is a view showing a difference between a conventional control region and CORESET in NR.
  • FIG. 10 shows an example of a frame structure for a new radio access technology.
  • 11 is an abstract diagram of a hybrid beamforming structure from the perspective of the TXRU and the physical antenna.
  • FIG. 12 shows a synchronization signal and a PBCH (SS / PBCH) block.
  • 13 is for explaining a method for a terminal to obtain timing information.
  • FIG. 14 shows an example of a process for obtaining system information of a terminal.
  • 16 is for explaining a power ramping car circle.
  • 17 is for explaining the concept of the threshold of the SS block for the RACH resource relationship.
  • 19 illustrates a method of adjusting CWS in a downlink LBT process.
  • FIG. 20 illustrates a transport block or code block group used for contention window size adjustment in the first slot in a downlink transmission burst.
  • 21 is another example of a transport block or code block group used for contention window size adjustment in a first slot in a downlink transmission burst.
  • 22 is another example of a transport block or a code block group used for contention window size adjustment in a reference downlink resource.
  • CORESET and a plurality of TBs set in a reference DL resource, and TB and CBG to be used for CWS adjustment.
  • FIG. 24 shows an example of setting of a TRESET and a plurality of TBs and a CORESET set in a reference DL resource.
  • 25 illustrates a method of calculating effective HARQ-ACK.
  • 26 illustrates a method of adjusting CWS in an uplink LBT process.
  • 29 is another example illustrating TB used for CWS coordination.
  • CGU set grant
  • 31 illustrates a method of adjusting the contention window size for a terminal to access a channel in an unlicensed band.
  • 33 illustrates a signal processing circuit for a transmission signal.
  • 35 is an example of a parity check matrix represented by a protograph.
  • 36 shows an example of an encoder structure for a polar code.
  • 38 is a flowchart illustrating an example of performing an idle mode DRX operation.
  • 39 is a schematic diagram of an example of an idle mode DRX operation.
  • 40 is a flowchart showing an example of a method for performing a C-DRX operation.
  • FIG 43 shows another example of a wireless device applied to the present disclosure.
  • 46 shows the AI device 100.
  • a / B may mean “A and / or B”.
  • A, B may mean “A and / or B”.
  • a / B / C may mean “at least one of A, B, and / or C”.
  • A, B, and C may mean “at least one of A, B, and / or C”.
  • E-UTRAN Evolved-UMTS Terrestrial Radio Access Network
  • LTE Long Term Evolution
  • the E-UTRAN includes a base station (BS) that provides a control plane and a user plane to a user equipment (UE) 10.
  • the terminal 10 may be fixed or mobile, and may be called other terms such as a mobile station (MS), a user terminal (UT), a subscriber station (SS), a mobile terminal (MT), or a wireless device.
  • the base station 20 refers to a fixed station that communicates with the terminal 10, and may be referred to as other terms such as an evolved-NodeB (eNB), a base transceiver system (BTS), and an access point.
  • eNB evolved-NodeB
  • BTS base transceiver system
  • the base stations 20 may be connected to each other through an X2 interface.
  • the base station 20 is connected to an EPC (Evolved Packet Core 30) through an S1 interface, and more specifically, a mobility management entity (MME) through an S1-MME and a serving gateway (S-GW) through an S1-U.
  • EPC Evolved Packet Core 30
  • MME mobility management entity
  • S-GW serving gateway
  • EPC 30 is composed of MME, S-GW and P-GW (Packet Data Network-Gateway).
  • the MME has access information of the terminal or information about the capability of the terminal, and this information is mainly used for mobility management of the terminal.
  • S-GW is a gateway with E-UTRAN as an endpoint
  • P-GW is a gateway with PDN as an endpoint.
  • the layers of the radio interface protocol between the terminal and the network are based on the lower three layers of the Open System Interconnection (OSI) reference model, which is widely known in communication systems, L1 (first layer), It can be divided into L2 (second layer) and L3 (third layer), among which the physical layer belonging to the first layer provides an information transfer service using a physical channel.
  • the radio resource control (RRC) layer located in the third layer serves to control radio resources between the terminal and the network. To this end, the RRC layer exchanges RRC messages between the terminal and the base station.
  • OSI Open System Interconnection
  • FIG. 2 is a block diagram showing a radio protocol architecture for a user plane
  • FIG. 3 is a block diagram showing a radio protocol architecture for a control plane.
  • the user plane is a protocol stack for transmitting user data
  • the control plane is a protocol stack for transmitting control signals.
  • a physical layer provides an information transfer service (information transfer service) to the upper layer by using a physical channel (physical channel).
  • the physical layer is connected to the upper layer, the medium access control (MAC) layer, through a transport channel. Data moves between the MAC layer and the physical layer through the transport channel. Transport channels are classified according to how and with what characteristics data is transmitted through a wireless interface.
  • the physical channel can be modulated by an orthogonal frequency division multiplexing (OFDM) method, and utilizes time and frequency as radio resources.
  • OFDM orthogonal frequency division multiplexing
  • the functions of the MAC layer include mapping between logical channels and transport channels, and multiplexing / demultiplexing into transport blocks provided as physical channels on a transport channel of a MAC service data unit (SDU) belonging to the logical channel.
  • the MAC layer provides a service to a Radio Link Control (RLC) layer through a logical channel.
  • RLC Radio Link Control
  • the functions of the RLC layer include concatenation, segmentation and reassembly of RLC SDUs.
  • the RLC layer includes a transparent mode (TM), an unacknowledged mode (UM), and an acknowledgment mode (Acknowledged Mode).
  • TM transparent mode
  • UM unacknowledged mode
  • Acknowledged Mode acknowledgment mode
  • AM AM RLC provides error correction through automatic repeat request (ARQ).
  • RRC Radio Resource Control
  • the RRC layer is responsible for control of logical channels, transport channels, and physical channels in connection with configuration, re-configuration, and release of radio bearers.
  • RB means a logical path provided by the first layer (PHY layer) and the second layer (MAC layer, RLC layer, PDCP layer) for data transmission between the terminal and the network.
  • the functions of the Packet Data Convergence Protocol (PDCP) layer in the user plane include the transfer of user data, header compression, and ciphering.
  • the functions of the Packet Data Convergence Protocol (PDCP) layer in the control plane include transmission of control plane data and encryption / integrity protection.
  • the establishment of RB means a process of defining characteristics of a radio protocol layer and a channel to provide a specific service, and setting each specific parameter and operation method.
  • the RB can be further divided into two types: Signaling RB (SRB) and Data RB (DRB).
  • SRB is used as a path for transmitting RRC messages in the control plane
  • DRB is used as a path for transmitting user data in the user plane.
  • the UE When an RRC connection is established between the RRC layer of the UE and the RRC layer of the E-UTRAN, the UE is in an RRC connected state, otherwise it is in an RRC idle state.
  • the downlink transport channel for transmitting data from the network to the terminal includes a broadcast channel (BCH) for transmitting system information and a downlink shared channel (SCH) for transmitting user traffic or control messages. Traffic or control messages of a downlink multicast or broadcast service may be transmitted through a downlink SCH or may be transmitted through a separate downlink multicast channel (MCH).
  • an uplink transport channel for transmitting data from a terminal to a network includes a random access channel (RACH) for transmitting an initial control message and an uplink shared channel (SCH) for transmitting user traffic or a control message.
  • RACH random access channel
  • SCH uplink shared channel
  • Logical channels that are located above the transport channel and are mapped to the transport channel include BCCH (Broadcast Control Channel), PCCH (Paging Control Channel), CCCH (Common Control Channel), MCCH (Multicast Control Channel), and MTCH (Multicast Traffic). Channel).
  • BCCH Broadcast Control Channel
  • PCCH Paging Control Channel
  • CCCH Common Control Channel
  • MCCH Multicast Control Channel
  • MTCH Multicast Traffic. Channel
  • the physical channel is composed of several OFDM symbols in the time domain and several sub-carriers in the frequency domain.
  • One sub-frame (Sub-frame) is composed of a plurality of OFDM symbols (Symbol) in the time domain.
  • the resource block is a resource allocation unit, and is composed of a plurality of OFDM symbols and a plurality of sub-carriers.
  • each subframe may use specific subcarriers of specific OFDM symbols (eg, the first OFDM symbol) of a corresponding subframe for a physical downlink control channel (PDCCH), that is, an L1 / L2 control channel.
  • TTI Transmission Time Interval
  • new radio access technology new radio access technology: new RAT, NR
  • next-generation wireless access technology As more communication devices require a larger communication capacity, there is a need for improved mobile broadband communication compared to a conventional radio access technology (RAT).
  • MTC Massive Machine Type Communications
  • NR Ultra-Reliable and Low Latency Communication
  • FIG. 4 shows another example of a wireless communication system to which the technical features of the present disclosure can be applied.
  • FIG. 4 shows a system architecture based on a 5G new radio access technology (NR) system.
  • the entity used in the 5G NR system may absorb some or all functions of the entity introduced in FIG. 1 (eg, eNB, MME, S-GW).
  • the entity used in the NR system can be identified by the name "NG" to distinguish it from LTE.
  • the wireless communication system includes one or more UE 11, a next-generation RAN (NG-RAN), and a 5G core network (5GC).
  • the NG-RAN is composed of at least one NG-RAN node.
  • the NG-RAN node is an entity corresponding to BS 20 shown in FIG. 1.
  • the NG-RAN node is composed of at least one gNB 21 and / or at least one ng-eNB 22.
  • the gNB 21 provides termination of the NR user plane and control plane protocols towards the UE 11.
  • Ng-eNB 22 provides termination of the E-UTRA user plane and control plane protocols towards UE 11.
  • 5GC includes access and mobility management function (AMF), user plane function (UPF) and session management function (SMF).
  • AMF hosts functions such as NAS security and idle state mobility processing.
  • AMF is an entity that includes the functions of a conventional MME.
  • UPF hosts functions such as mobility anchoring and protocol data unit (PDU) processing.
  • PDU protocol data unit
  • UPF is an entity that includes the functions of a conventional S-GW.
  • the SMF hosts functions such as UE IP address allocation and PDU session control.
  • the gNB and ng-eNB are interconnected via an Xn interface.
  • gNB and ng-eNB are also connected to 5GC through the NG interface. More specifically, it is connected to AMF through the NG-C interface and UPF through the NG-U interface.
  • 5 illustrates functional division between NG-RAN and 5GC.
  • gNB is an inter-cell radio resource management (Inter Cell RRM), radio bearer management (RB control), connection mobility control (Connection Mobility Control), radio admission control (Radio Admission Control), measurement settings and provision It can provide functions such as (Measurement configuration & Provision), dynamic resource allocation, and the like.
  • AMF can provide functions such as NAS security and idle state mobility processing.
  • UPF may provide functions such as mobility anchoring and PDU processing.
  • the Session Management Function (SMF) may provide functions such as terminal IP address allocation and PDU session control.
  • FIG. 6 illustrates a frame structure that can be applied in NR.
  • a frame may be composed of 10 ms (millisecond), and may include 10 subframes composed of 1 ms.
  • One or a plurality of slots may be included in a subframe according to subcarrier spacing.
  • Table 1 below illustrates the subcarrier spacing configuration ⁇ .
  • Table 2 shows the number of slots in a frame (N frame, ⁇ slot ), the number of slots in a subframe (N subframe, ⁇ slot ), and the number of symbols in a slot (N slot symb ) according to subcarrier spacing configuration ⁇ . And the like.
  • a slot includes a plurality of symbols in the time domain. For example, in the case of a normal CP, one slot includes 14 symbols, but in the case of an extended CP, one slot may include 12 symbols. Alternatively, in the case of a normal CP, one slot includes 7 symbols, but in the case of an extended CP, one slot may include 6 symbols.
  • the carrier wave includes a plurality of subcarriers in the frequency domain.
  • a resource block (RB) may be defined as a plurality of (eg, 12) consecutive subcarriers in the frequency domain.
  • the BWP (Bandwidth Part) may be defined as a plurality of consecutive (P) RBs in the frequency domain, and may correspond to one numerology (eg, SCS, CP length, etc.).
  • the carrier may include up to N (eg, 5) BWPs. Data communication can be performed through an activated BWP.
  • Each element may be referred to as a resource element (RE) in the resource grid, and one complex symbol may be mapped.
  • RE resource element
  • a physical downlink control channel may be composed of one or more control channel elements (CCEs) as shown in Table 3 below.
  • CCEs control channel elements
  • the PDCCH may be transmitted through a resource composed of 1, 2, 4, 8 or 16 CCEs.
  • CCE is composed of six resource element groups (REGs), and one REG is composed of one resource block in the frequency domain and one orthogonal frequency division multiplexing (OFDM) symbol in the time domain.
  • REGs resource element groups
  • OFDM orthogonal frequency division multiplexing
  • a new unit called a control resource set can be introduced.
  • the terminal may receive the PDCCH in CORESET.
  • CORESET is composed of N CORESET RB resource blocks in the frequency domain and N CORESET symb ⁇ ⁇ 1, 2, 3 ⁇ symbols in the time domain.
  • N CORESET RB and N CORESET symb may be provided by a base station through a higher layer signal.
  • a plurality of CCEs (or REGs) may be included in CORESET.
  • the UE may attempt to detect PDCCH in units of 1, 2, 4, 8 or 16 CCEs in CORESET.
  • PDCCH candidates One or a plurality of CCEs capable of attempting PDCCH detection may be referred to as PDCCH candidates.
  • the terminal may receive a plurality of CORESETs.
  • 9 is a view showing a difference between a conventional control region and CORESET in NR.
  • the control area 300 in a conventional wireless communication system (eg, LTE / LTE-A) is configured over the entire system band used by a base station. All terminals except for some terminals (for example, eMTC / NB-IoT terminals) supporting only a narrow band receive radio signals in the entire system band of the base station in order to properly receive / decode control information transmitted by the base station. I should be able to.
  • CORESET (301, 302, 303) may be referred to as a radio resource for control information that the terminal should receive, and may use only a part of the entire system band.
  • the base station can allocate CORESET to each terminal, and can transmit control information through the assigned CORESET.
  • the first CORESET 301 may be allocated to the terminal 1
  • the second CORESET 302 may be allocated to the second terminal
  • the third CORESET 303 may be allocated to the terminal 3.
  • the terminal in the NR can receive control information of the base station even if it does not necessarily receive the entire system band.
  • the CORESET there may be a terminal-specific CORESET for transmitting terminal-specific control information and a common CORESET for transmitting control information common to all terminals.
  • the resource may include at least one of a resource in the time domain, a resource in the frequency domain, a resource in the code domain, and a resource in the spatial domain.
  • FIG. 10 shows an example of a frame structure for a new radio access technology.
  • a structure in which a control channel and a data channel are time-division multiplexed (TDM) within one TTI is considered as one of the frame structures as shown in FIG. 10 for the purpose of minimizing latency. Can be.
  • TDM time-division multiplexed
  • the hatched area indicates a downlink control area, and the black part indicates an uplink control area.
  • An area without an indication may be used for downlink data (DL data) transmission, or may be used for uplink data (UL data) transmission.
  • the characteristic of this structure is that downlink (DL) transmission and uplink (UL) transmission are sequentially performed in one subframe, DL data is transmitted in a subframe, and UL ACK / NACK (Acknowledgement / Not-acknowledgement) is also available. As a result, when a data transmission error occurs, it takes less time to retransmit the data, thereby minimizing latency of the final data transmission.
  • the base station and the terminal type gap (time gap) for a process of switching from a transmission mode to a reception mode or a process of switching from a reception mode to a transmission mode ) Is required.
  • some OFDM symbols at a time point of switching from DL to UL may be set as a guard period (GP).
  • the wavelength is shortened, so that it is possible to install multiple antenna elements in the same area. That is, in the 30 GHz band, the wavelength is 1 cm, and a total of 100 antenna elements can be installed in a 2-dimensional arrangement at 0.5 wavelength intervals on a 5 by 5 cm panel. Therefore, in mmW, a plurality of antenna elements are used to increase beamforming (BF) gain to increase coverage or increase throughput.
  • BF beamforming
  • TXRU Transceiver Unit
  • hybrid beamforming having B TXRUs, which are fewer than Q antenna elements, as an intermediate form of digital beamforming (analog BF) and digital beamforming (analog BF).
  • analog BF digital beamforming
  • analog BF digital beamforming
  • the analog beamforming (or RF beamforming) performs precoding (or combining) in the RF stage, which results in the number of RF chains and the number of D / A (or A / D) converters. It has the advantage of being able to achieve a performance close to digital beamforming while reducing.
  • the hybrid beamforming structure may be represented by N TXRUs and M physical antennas.
  • digital beamforming for the L data layers to be transmitted by the transmitting end can be represented by an N by L matrix, and then the converted N digital signals are converted into analog signals through TXRU. After conversion, analog beamforming represented by an M by N matrix is applied.
  • 11 is an abstract diagram of a hybrid beamforming structure from the perspective of the TXRU and the physical antenna.
  • the number of digital beams is L
  • the number of analog beams is N.
  • the base station is designed to change the analog beamforming on a symbol-by-symbol basis, and considers a direction for supporting more efficient beamforming to terminals located in a specific region. Further, when defining a specific N TXRU and M RF antennas as a single antenna panel in FIG. 11, the NR system considers a method of introducing a plurality of antenna panels to which hybrid beamforming independent of each other is applicable. Is becoming.
  • a specific subframe is at least for a synchronization signal, system information, and paging.
  • a beam sweeping operation is being considered in which a plurality of analog beams to be applied by a base station is changed for each symbol so that all terminals have a reception opportunity.
  • FIG. 12 shows a synchronization signal and a PBCH (SS / PBCH) block.
  • the SS / PBCH block spans PSS and SSS, each occupying 1 symbol and 127 subcarriers, and 3 OFDM symbols and 240 subcarriers, but an unused portion for SSS is interposed on one symbol. It consists of the remaining PBCH.
  • the periodicity of the SS / PBCH block can be set by the network, and the time position at which the SS / PBCH block can be transmitted can be determined by the subcarrier spacing.
  • polar coding may be used.
  • the UE may assume a band-specific subcarrier interval for the SS / PBCH block unless the network sets the UE to assume a different subcarrier interval.
  • PBCH symbols carry their frequency-multiplexed DMRS.
  • QPSK modulation can be used for PBCH.
  • 1008 unique physical layer cell IDs may be given.
  • the first symbol indices for candidate SS / PBCH blocks are determined according to the subcarrier spacing of SS / PBCH blocks described later.
  • n 0, 1.
  • n 0, 1, 2, 3.
  • n 0.
  • n 0 and 1.
  • n 0, 1.
  • n 0, 1, 2, 3.
  • n 0, 1, 2, 3, 5, 6, 7, 8, 10, 11, 12, 13, 15, 16, 17, 18.
  • n 0, 1, 2, 3, 5, 6, 7, 8.
  • the candidate SS / PBCH blocks in the half frame are indexed in ascending order from 0 to L-1 on the time axis.
  • an index of SS / PBCH blocks in which the UE cannot receive other signals or channels in REs overlapping REs corresponding to SS / PBCH blocks is set. Can be.
  • SS / PBCH blocks have an index of SS / PBCH blocks per serving cell that cannot receive other signals or channels in REs overlapping REs corresponding to the SS / PBCH blocks Can be set.
  • the setting by 'SSB-transmitted' may take priority over the setting by 'SSB-transmitted-SIB1'.
  • the periodicity of the half frame for reception of SS / PBCH blocks per serving cell may be set by the upper layer parameter 'SSB-periodicityServingCell'. If the UE does not receive the periodicity of the half frame for reception of SS / PBCH blocks, the UE should assume the periodicity of the half frame. The UE may assume that periodicity is the same for all SS / PBCH blocks in the serving cell.
  • 13 is for explaining a method for a terminal to obtain timing information.
  • the terminal can obtain 6-bit SFN information through a Master Information Block (MIB) received in the PBCH.
  • MIB Master Information Block
  • the terminal can obtain a 1-bit half frame indicator as part of the PBCH payload.
  • the terminal can obtain the SS / PBCH block index by DMRS sequence and PBCH payload. That is, the LSB 3 bits of the SS block index can be obtained by the DMRS sequence for a period of 5 ms. Also, MSB 3 bits of timing information are explicitly carried in the PBCH payload (for more than 6 GHz).
  • the UE may assume that a half frame with SS / PBCH blocks occurs with a periodicity of 2 frames. If it detects the SS / PBCH block, the terminal, and if the k for the FR1 and SSB ⁇ 23 ⁇ 11 SSB and k for FR2, Type0-PDCCH common search space (common search space) is determined that the present controlled set of resources for do. The UE determines that if k SSB > 23 for FR1 and k SSB > 11 for FR2, there is no control resource set for the Type0-PDCCH common search space.
  • the terminal For a serving cell without transmission of SS / PBCH blocks, the terminal acquires time and frequency synchronization of the serving cell based on reception of SS / PBCH blocks on the primary cell or PSCell of the cell group for the serving cell.
  • SI System information
  • MIB MasterInformationBlock
  • SIBs SystemInformationBlocks
  • -MIB has a period of 80ms and is always transmitted on the BCH and repeated within 80ms, and includes parameters necessary to obtain SystemInformationBlockType1 (SIB1) from the cell;
  • SIB1 is transmitted on a DL-SCH with periodicity and repetition.
  • SIB1 includes information about availability and scheduling of other SIBs (eg, periodicity, SI-window size). It also indicates whether these (ie, other SIBs) are provided on a periodic broadcast basis or on demand. If other SIBs are provided by request, SIB1 includes information for the UE to perform SI request;
  • SIBs other than SIB1 are carried as a SystemInformation (SI) message transmitted on the DL-SCH.
  • SI SystemInformation
  • Each SI message is transmitted within a periodic time domain window (called an SI-window);
  • the RAN provides the necessary SI by dedicated signaling. Nevertheless, the UE must acquire the MIB of the PSCell in order to obtain the SFN timing of the SCH (which may be different from the MCG).
  • the RAN releases and adds the relevant secondary cell.
  • SI can only be changed with Reconfiguration with Sync.
  • FIG. 14 shows an example of a system information acquisition process of a terminal.
  • the terminal may receive MIB from the network, and then receive SIB1. Thereafter, the terminal may transmit a system information request to the network, and receive a SystemInformation message from the network in response thereto.
  • the UE may apply a system information acquisition procedure for acquiring AS (access stratum) and NAS (non-access stratum) information.
  • UEs in the RRC_IDLE and RRC_INACTIVE states must ensure (at least) MIB, SIB1 and SystemInformationBlockTypeX of valid versions (according to the relevant RAT support for mobility controlled by the terminal).
  • the UE in the RRC_CONNECTED state must ensure a valid version of MIB, SIB1, and SystemInformationBlockTypeX (according to mobility support for the relevant RAT).
  • the terminal should store the related SI obtained from the current camped / serving cell.
  • the version of SI acquired and stored by the terminal is valid only for a certain period of time.
  • the terminal may use this stored version of SI after, for example, cell reselection, return from out of coverage, or after system information change instruction.
  • the random access procedure of the terminal can be summarized as shown in Table 4 below.
  • the UE may transmit a PRACH preamble in uplink as Msg 1 of a random access procedure.
  • Random access preamble sequences having two different lengths are supported.
  • Long sequences of length 839 apply to subcarrier spacing of 1.25 kHz and 5 kHz, and short sequences of length 139 apply to subcarrier spacing of 15, 30, 60, and 120 kHz.
  • Long sequences support an unrestricted set and limited sets of type A and type B, while short sequences support only an unrestricted set.
  • a plurality of RACH preamble formats are defined by one or more RACH OFDM symbols, different cyclic prefix (CP), and guard time.
  • the PRACH preamble setting to be used is provided to the terminal as system information.
  • the UE may retransmit the power ramped PRACH preamble within a prescribed number of times.
  • the UE calculates the PRACH transmission power for retransmission of the preamble based on the most recent estimated path loss and power ramping counter. If the terminal performs beam switching, the power ramping counter does not change.
  • 16 is for explaining a power ramping car circle.
  • the UE may perform power ramping for retransmission of the random access preamble based on the power ramping counter.
  • the power ramping counter does not change when the terminal performs beam switching during PRACH retransmission.
  • the UE when the UE retransmits the random access preamble for the same beam, such as when the power ramping counter increases from 1 to 2 and 3 to 4, the UE increments the power ramping counter by one. However, when the beam is changed, the power ramping counter does not change when the PRACH is retransmitted.
  • 17 is for explaining the concept of the threshold of the SS block for the RACH resource relationship.
  • the system information informs the UE of the relationship between SS blocks and RACH resources.
  • the threshold of the SS block for the RACH resource relationship is based on RSRP and network configuration.
  • the transmission or retransmission of the RACH preamble is based on an SS block that satisfies the threshold. Therefore, in the example of FIG. 17, since the SS block m exceeds the threshold of the received power, the RACH preamble is transmitted or retransmitted based on the SS block m.
  • the DL-SCH may provide timing arrangement information, an RA-preamble ID, an initial uplink grant, and a temporary C-RNTI.
  • the UE may perform uplink transmission on the UL-SCH as Msg3 of the random access procedure.
  • Msg3 may include an RRC connection request and a UE identifier.
  • the network may transmit Msg4, which can be treated as a contention resolution message, in a downlink.
  • Msg4 can be treated as a contention resolution message
  • ⁇ up to 400 megahertz (MHz) per component carrier (CC) can be supported.
  • the terminal operating in such a wideband CC is always operated with RF on the entire CC, the battery consumption of the terminal may increase.
  • different numerology for each frequency band within the CC eg, subcarrier spacing (sub -carrier spacing (SCS)
  • SCS sub -carrier spacing
  • capacities for the maximum bandwidth may be different for each terminal.
  • the base station may instruct the terminal to operate only in a partial bandwidth, not the entire bandwidth of the broadband CC, and for convenience, the partial bandwidth is defined as a bandwidth part (BWP).
  • the BWP may be composed of continuous resource blocks (RBs) on a frequency axis, and one neurology (eg, subcarrier spacing, CP (cyclic prefix) length, slot / mini-slot) Duration, etc.).
  • the base station may set multiple BWPs even within one CC set for the terminal. For example, in a PDCCH monitoring slot, a BWP occupying a relatively small frequency domain is set, and a PDSCH indicated by the PDCCH can be scheduled on a larger BWP.
  • some terminals may be set as different BWPs for load balancing.
  • some spectrums of the entire bandwidth may be excluded and both BWPs may be set in the same slot 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 terminal associated with a wideband CC, and set at least one DL / UL BWP among DL / UL BWP (s) set at a specific time.
  • Activation by L1 signaling or MAC CE or RRC signaling, etc.
  • switching to another set DL / UL BWP by L1 signaling or MAC CE or RRC signaling, etc.
  • timer based timer When the value expires, it may be switched to a predetermined DL / UL BWP.
  • the activated DL / UL BWP is defined as an active DL / UL BWP.
  • DL / UL BWP settings may not be received.
  • / UL BWP is defined as initial active DL / UL BWP.
  • LAA licensed assisted access
  • the licensed assisted access may refer to a method of performing data transmission and reception in an unlicensed band in combination with an unlicensed band (eg, a WiFi band).
  • an unlicensed band eg, a WiFi band
  • the cell accessed by the terminal in the unlicensed band may be referred to as a USCell (or LAA secondary cell), and a cell connected in the licensed band may be a primary cell.
  • the eNB operating as the LAA secondary cell (s) must perform the following channel access procedure to access the channel (s) on which the LAA secondary cell (s) transmission (s) are performed.
  • the eNB transmits the LAA secondary cell (s) ( PDSCH / PDCCH / EPDCCH may be transmitted on a carrier on which field) is performed.
  • the counter N is adjusted by sensing the channel for additional slot period (s) according to the following steps.
  • N init N init .
  • N init is an arbitrary number uniformly distributed between 0 and CW p . Then go to step 4.
  • N N-1 is set.
  • the channel is sensed until a busy slot is detected within an additional delay period T d or all slots of the additional delay period T d are detected as idle.
  • step 6 If the channel is sensed as idle for all slot periods of the additional delay period T d , go to step 4. Otherwise, go to step 5.
  • the eNB If the eNB has not transmitted a transmission including PDSCH / PDCCH / EPDCCH on the carrier on which the LAA secondary cell (s) transmission (s) is performed after step 4 of the above procedure, the eNB is ready to transmit PDSCH / PDCCH / EPDCCH If the channel is idle for at least the slot period T sl , and if it is detected that the channel is idle for all slot periods of the delay period T d immediately before this transmission, the eNB includes PDSCH / PDCCH / EPDCCH on the carrier. You can send the transmission.
  • the eNB When the eNB senses the channel for the first time since it is ready to transmit, if the channel fails to sense that it is idle within the slot period T sl or during any slot periods of the delay period T d immediately before this scheduled transmission If it is detected that the channel is not idle, the eNB proceeds to step 1 after sensing that the channel is idle during the slot periods of the delay period T d .
  • T f includes an idle slot duration T sl at the starting point of T f .
  • the slot period T sl is considered idle if the eNB senses the channel during the slot period and the power sensed by the eNB for at least 4us within the slot period is less than the energy detection threshold X Thresh . Otherwise, the slot period T sl is considered complicated.
  • CW p (CW min, p ⁇ CW p ⁇ CW max, p ) is a contention window.
  • CW p application is described in the contention window application procedure.
  • CW min, p and CW max, p are selected prior to step 1 of the above-described procedure.
  • m p , CW min, p , and CW max, p are based on a channel access priority class related to eNB transmission, as shown in Table 3.
  • the eNB If N> 0 in the above procedure, if the eNB transmits discovery signal transmission (s) not including PDSCH / PDCCH / EPDCCH, the eNB should not decrease N during slot period (s) overlapping discovery signal transmission.
  • the eNB should not continuously transmit on the carrier on which the LAA secondary cell (s) transmission (s) is performed for a period exceeding T mcot, p given in Table 5.
  • Table 5 is a table of channel access priority classes.
  • the channel is considered to be idle for a T drs when sensing that the idle during slot duration if T drs.
  • the eNB If the eNB transmits the transmissions including the PDSCH associated with the channel access priority class p on the carrier, the eNB maintains the contention window value CW p and before step 1 of the above-described procedure for transmissions using the following steps Adjust CW p to.
  • the reference subframe k is the start subframe of the most recent transmission on the carrier made by the eNB where at least some HARQ-ACK feedback is expected to be available.
  • the eNB should adjust the value of CW p for all priority classes p ⁇ ⁇ 1, 2, 3, 4 ⁇ only once based on the given reference subframe k.
  • HARQ-ACK values corresponding to PDSCH transmission (s) in subframe k + 1 are also PDSCH in subframe k It may be used in addition to HARQ-ACK values corresponding to the transmission (s).
  • NACK If HARQ-ACK feedback is not detected for PDSCH transmission by the eNB, or if the eNB detects that it is in the 'DTX', 'NACK / DTX', or 'any' state, it is calculated as NACK.
  • HARQ-ACK values correspond to PDSCH transmission (s) on the LAA secondary cell allocated by (E) PDCCH transmitted on another serving cell
  • the 'NACK / DTX', or 'any' state is calculated as NACK, and the 'DTX' state is ignored.
  • the 'NACK / DTX' state corresponding to 'no transmission' is calculated as NACK, and 'no transmission' ) ',' DTX 'status is ignored. Otherwise, HARQ-ACK for PDSCH transmission is ignored.
  • the HARQ-ACK value of each codeword is considered separately.
  • the eNB If the eNB transmits a transmission that includes a PDCCH / EPDCCH having DCI format 0A / 0B / 4A / 4B and does not include a PDSCH associated with a channel access priority class p on a channel starting from time t 0 , the eNB is a competition window Keep the value CW p and adjust CW p before step 1 of the above-described procedure for transmissions using the following steps.
  • T CO is calculated as described in the channel access procedure for uplink transmission (s) described later.
  • K is ⁇ 1, 2,... for each priority class p ⁇ ⁇ 1, 2, 3, 4 ⁇ by the eNB. , 8 ⁇ .
  • the eNB accessing the carrier on which the LAA secondary cell (s) transmission (s) is performed should set the energy detection threshold (X Thresh ) to be equal to or less than the maximum energy detection threshold X Thresh_max .
  • X Thresh_max is determined as described below.
  • Thresh_max min ⁇ T max + 10dB, X r ⁇ .
  • Thresh_max max ⁇ -72 + 10 * log10 (BWMHz / 20Mhz) dBm, min ⁇ T max , T max -T A + (P H + 10 * log10 (BWMHz / 20MHz) -P TX ) ⁇ .
  • -T A 5 dB for transmissions that do not include PDSCH and include discovery signal transmission (s).
  • -PTX is the maximum eNB output power set in dBm for the carrier.
  • the eNB uses the maximum transmission power set for a single carrier regardless of whether single carrier or multi-carrier transmission is used.
  • -BWMHz is the single carrier bandwidth in MHz.
  • the eNB may access a plurality of carriers on which LAA secondary cell (s) transmission (s) are performed according to one of Type A or Type B procedures described below.
  • the eNB should perform channel access on each carrier c i ⁇ C according to the channel access procedure for the transmission (s) including PDSCH / PDCCH / EPDCCH described above.
  • C is a set of carriers the eNB intends to transmit
  • i 0, 1, ⁇ , q-1
  • q is the number of carriers the eNB intends to transmit.
  • N c_i The counter N described in the channel access procedure for the transmission (s) including the PDSCH / PDCCH / EPDCCH described above is determined for each carrier c i (c_i), and is indicated by N c_i .
  • N c_i is maintained in the following type A1 or type A2.
  • the counter N described in the channel access procedure for the transmission (s) including the PDSCH / PDCCH / EPDCCH described above is independently determined for each carrier c i and is indicated by N c_i .
  • eNB may resume the N c_i reduced if sensed after the re-initialization or after a wait for a period of N c_i idle slot (idle slot) to 4T sl.
  • the counter N described in the channel access procedure for the transmission (s) including the PDSCH / PDCCH / EPDCCH described above is determined for the carrier c j ⁇ C and is indicated by N c_j .
  • c j is a carrier having the largest CW p value.
  • a N N c_j c_i.
  • the carrier c j ⁇ C is selected as follows by the eNB.
  • -eNB uniformly randomly selects c j from C before each transmission on a plurality of carriers c i ⁇ C, or
  • -eNB does not select c j more than once every 1 second.
  • C is a set of carriers that the eNB intends to transmit
  • i is 0, 1,... , q-1
  • q is the number of carriers that the eNB intends to transmit.
  • -eNB should perform channel access on carrier c j according to the channel access procedure for the transmission (s) including PDSCH / PDCCH / EPDCCH described above, which has the following modification to type B1 or type B2. .
  • carrier c i is idle for each carrier c for i
  • the carrier c i is considered to be idle for T mc if the channel is sensed as idle during all time periods during which idle sensing is performed on carrier c j within a given interval T mc .
  • the eNB should not continuously transmit on a carrier having c i ⁇ C and c i ⁇ c j for a period exceeding T mcot, p given in Table 5.
  • T mcot, p the value of T mcot, p is determined using a channel access parameter used for carrier c j .
  • a single CW p value is maintained for the set C of carriers.
  • step 2 of the procedure described in the contention window adjustment procedure is modified as follows.
  • each priority class p ⁇ ⁇ 1 For 2, 3, 4 ⁇ , increase CW p to the next highest allowed value, otherwise go to step 1.
  • the CW p value is maintained independently for each carrier c i ⁇ C using the aforementioned competition window application procedure.
  • the CW p value of carrier c j1 ⁇ C is used, where c j1 is the carrier with the largest CW p value among all carriers in set C.
  • the UE and the eNB scheduling the uplink transmission (s) for the UE must perform the following procedures to access the channel (s) on which the LAA secondary cell (s) transmission (s) are performed for the UE.
  • the terminal may access the carrier on which the LAA secondary cell (s) uplink transmission (s) is performed according to one of the type 1 or type 2 uplink channel access procedures.
  • the type 1 channel access procedure and the type 2 channel access procedure will be described later.
  • an uplink grant scheduling PUSCH transmission indicates a type 1 channel access procedure
  • the UE uses a type 1 channel access procedure to transmit transmissions including PUSCH transmission unless otherwise described below. Should be.
  • an uplink grant scheduling PUSCH transmission indicates a type 2 channel access procedure
  • the UE uses a type 2 channel access procedure to transmit transmissions including PUSCH transmission unless otherwise described below. Should be.
  • the terminal should use a type 1 channel access procedure when transmitting SRS transmissions that do not include PUSCH transmission.
  • Table 6 shows channel access priority classes for uplink.
  • a set of subframes n 0 , n 1 ,... , n transmissions including PUSCH in w-1 are scheduled, and when the channel for transmission in subframe n k is not accessed, the UE subframe n k + according to the channel access type indicated in DCI. You should try to send within 1 , where k ⁇ ⁇ 0, 1,... , w-2 ⁇ , and w is the number of scheduled subframes indicated in DCI.
  • a set of subframes n 0 , n 1 ,... , n w-1 is scheduled to transmit transmissions without gaps including a PUSCH, and the subframe n k after the terminal accesses a carrier according to one of type 1 or type 2 uplink channel access procedures.
  • the terminal can continue transmission in subframes after n k , where k ⁇ ⁇ 0, 1,... , w-1 ⁇ .
  • the UE does not expect to receive different channel access types for transmissions in those subframes.
  • subframes n 0 , n 1 ,... , n w-1 is scheduled to transmit without gaps, k1 ⁇ ⁇ 0, 1,... , w-2 ⁇
  • the terminal subsequently subframes n k2 , k2 ⁇ ⁇ 1,... , w-1 ⁇ using a type 2 channel access procedure. If the channel sensed by the terminal does not continuously idle after the terminal stops transmitting, the terminal will transmit subsequent subframes n k2 , k2 ⁇ ⁇ 1, ... .., w-1 ⁇ may be transmitted using a type 1 channel access procedure having an uplink channel access priority level indicated in DCI corresponding to subframe n k2 .
  • DCI instructs PUSCH transmission starting in subframe n using a type 1 channel access procedure, and if the UE performs an ongoing (ongoing) type 1 channel access procedure before subframe n If you have,
  • the UE performs the persistent type PUSCH transmission may be transmitted in response to the UL grant by accessing a carrier using a 1-channel access procedure.
  • the UE performs the continuous channel access procedure. Should exit.
  • the UE is scheduled to transmit on a set C of carriers in subframe n, and UL grants scheduling PUSCH transmissions on a set C of carriers indicate a type 1 channel access procedure, and if the same ' PUSCH starting position ' If it is indicated for all carriers in the set C of carriers, and if the carrier frequencies of the set C of carriers are a subset of one of a set of predefined carrier frequencies,
  • the UE may transmit on the carrier c i ⁇ C using a type 2 channel access procedure.
  • the carrier c j is uniformly randomly selected by the UE from the set C of carriers before performing a type 1 channel access procedure on any carrier in the set C of carriers.
  • the eNB When an eNB transmits on a carrier according to a channel access procedure for transmission (s) containing PDSCH / PDCCH / EPDCCH, the eNB DCI of UL grant scheduling transmission (s) including PUSCH on a carrier in subframe n
  • the type 2 channel access procedure can be indicated within.
  • the eNB when the eNB transmits on the carrier according to the channel access procedure for the transmission (s) including PDSCH / PDCCH / EPDCCH, the eNB is a type 2 channel for the transmission (s) including PUSCH on the carrier in subframe n.
  • the 'UL configuration for LAA' field may indicate that the access procedure can be performed.
  • T short_ul subframe n in a carrier that follows the transmission by the eNB on a carrier having a duration of 25us Transmissions including PUSCH may be scheduled.
  • T CO T mcot, p + T g ,
  • -t 0 is the time at which the eNB starts transmission (time instant)
  • p value is determined by the base station as described in the downlink channel access procedure
  • -T g is any time period exceeding 25us, occurring between the downlink transmission of the base station and the uplink transmission scheduled by the base station, and between any two uplink transmissions scheduled by the base station starting at t 0 Is the total time interval of the gaps.
  • the eNB should schedule uplink transmissions between t 0 and t 0 + T CO in consecutive subframes.
  • the eNB If the eNB instructs the type 2 channel access procedure for the UE in DCI, the eNB indicates the channel access priority class used to obtain access to the channel in DCI.
  • the terminal may transmit the transmission using a type 1 channel access procedure.
  • the counter N is adjusted by sensing the channel for additional slot period (s) according to the following steps.
  • N init N init .
  • N init is an arbitrary number uniformly distributed between 0 and CW p . Then go to step 4.
  • N N-1 is set.
  • the channel is sensed until a busy slot is detected within an additional delay period T d or all slots of the additional delay period T d are detected as idle.
  • step 6 If the channel is sensed as idle for all slot periods of the additional delay period T d , go to step 4. Otherwise, go to step 5.
  • the UE If the UE did not transmit the transmission including the PUSCH on the carrier on which the LAA secondary cell (s) transmission (s) is performed after step 4 of the above-described procedure, the UE prepares to transmit the transmission including the PUSCH When the channel is sensed to be idle at least in the slot period T sl , and if the channel is sensed to be idle for all slot periods of the delay period T d immediately before transmission including the PUSCH, a transmission including the PUSCH is transmitted on the carrier. Can transmit.
  • the terminal proceeds to step 1 after sensing that the channel is idle during the slot periods of the delay period T d .
  • T f includes an idle slot duration T sl at the starting point of T f .
  • the slot period T sl is considered idle if the terminal senses the channel during the slot period and the power sensed by the terminal for at least 4us within the slot period is less than the energy detection threshold X Thresh . Otherwise, the slot period T sl is considered complicated.
  • CW p (CW min, p ⁇ CW p ⁇ CW max, p ) is a contention window.
  • CW p application will be described in the competition window application procedure described later.
  • CW min, p and CW max, p are selected before step 1 described above.
  • m p , CW min, p and CW max, p are based on the channel access priority class signaled to the terminal as shown in Table 4.
  • the terminal transmits the transmission using the type 1 channel access procedure related to the channel access priority class p on the carrier, the terminal maintains the contention window value CW p , and the above-described type 1 uplink channel using the procedures described below.
  • CW p for such transmissions must be applied prior to step 1 of the access procedure.
  • -Set CW p CW min, p for all priority classes p ⁇ ⁇ 1, 2, 3, 4 ⁇ .
  • 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 sub before the subframe n g -3 in which the UE transmits the UL-SCH using the type 1 channel access procedure It is a frame.
  • the reference subframe nref is a subframe n 0 ,
  • the reference subframe n ref is subframe n w .
  • the terminal uses a type 1 channel access procedure, a set of subframes n 0 , n 1 ,... , scheduled to transmit transmissions containing PUSCH without gaps within n w-1 , and if it is unable to transmit any transmissions containing PUSCH within the set of subframes, the UE has all priority classes p ⁇ ⁇ For 1, 2, 3, 4 ⁇ , the CW p value can be maintained without changing.
  • the UE uses all Type 1 channel access procedures to make all priority classes p ⁇ ⁇ 1, the same as for the last scheduled transmission including the PUSCH. CWp values for 2, 3, and 4 ⁇ can be maintained.
  • the terminal accessing the carrier on which the LAA secondary cell (s) transmission (s) is performed should set the energy detection threshold (X Thresh ) to be less than or equal to the maximum energy detection threshold X Thresh_max .
  • X Thresh_max is determined as follows.
  • Thresh_max is set equal to the value signaled by the upper layer parameter.
  • the terminal should determine X ' Thresh_max according to the default maximum energy detection threshold calculation procedure described later.
  • X Thresh_max is set by applying X ' Thresh_max according to the offset value signaled by the upper layer parameter.
  • Thresh_max min ⁇ T max + 10dB, X r ⁇ , where:
  • Thresh_max max ⁇ -72 + 10 * log10 (BWMHz / 20MHz) dBm, min ⁇ T max , T max -T A + (P H + 10 * log10 (BWMHz / 20MHz) -P TX ) ⁇
  • -BWMHz is the single carrier bandwidth in MHz.
  • LTE / NR systems also traffic offloading unlicensed bands, such as the 2.4GHz band, used primarily by existing WiFi systems, or unlicensed bands, such as the emerging 5 GHz and 60 GHz bands. We are considering how to use it.
  • a cell operating in a license band may be defined as an L-cell, and a carrier of the L-cell may be referred to as (DL / UL) LCC.
  • a cell operating in an unlicensed band hereinafter, also referred to as a U-band
  • a carrier of the U-cell may be referred to 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, component carrier (CC)
  • CC component carrier
  • the terminal and the base station can transmit and receive signals through a single UCC or a plurality of carrier-coupled UCC. That is, the terminal and the base station may transmit and receive signals only through the UCC (s) without LCC.
  • the signal transmission / reception operation in the unlicensed band described in the present disclosure may be performed based on all the above-described deployment scenarios (unless otherwise stated).
  • each communication node performs channel sensing before transmitting the signal to confirm that the other communication node does not transmit the signal.
  • LBT listen before talk
  • CAP channel access procedure
  • CS carrier sensing
  • CCA clear channel assessment
  • the base station (eNB) or the terminal of the LTE / NR system also needs to perform LBT for signal transmission in an unlicensed band (U-band).
  • other communication nodes such as WiFi should also perform LBT so as not to cause interference.
  • the CCA threshold is defined as -62 dBm for a non-WiFi signal and -82 dBm for a WiFi signal. This means that a station (terminal) or an access point (AP), for example, does not transmit a signal to prevent interference when signals other than WiFi are received at a power of -62 dBm or more.
  • the base station In order to transmit the uplink data of the UE in the unlicensed band, the base station must first succeed in LBT for UL grant transmission on the unlicensed band, and the UE must also succeed in LBT for UL data transmission. That is, the UL data transmission may be attempted only when both LBTs of the base station and the terminal are successful.
  • a delay of at least 4 msec is required between an UL grant and UL data scheduled from the UL grant in the LTE system. Therefore, if another transmission node coexisting in the unlicensed band accesses during the corresponding time, the scheduled UL data transmission may be delayed. For this reason, a method of increasing the efficiency of UL data transmission in an unlicensed band is being discussed.
  • AUL autonomous uplink
  • X 40 bits
  • the UE When the UE is instructed to activate automatic transmission (auto Tx activation), it is possible to transmit uplink data without a UL grant in a subframe or slot indicated in the corresponding bitmap.
  • the base station sends PDCCH, which is scheduling information necessary for decoding
  • the UE can transmit AUL UCI, which is information necessary for the base station to decode the PUSCH, when transmitting the PUSCH in the AUL.
  • the AUL-UCI includes HARQ ID, NDI (new data indicator), redundancy version (RV), AUL SF (subframe) start position, AUL SF last position, and information required for receiving AUL PUSCH and UE-initiated COT (COT). It may include information for sharing the base station and the like.
  • sharing the terminal-initiated COT with the base station specifically transfers some of the channels caught by the terminal to the base station through a random-backoff-based category 4 LBT (or type 1 channel access procedure),
  • the base station transmits the PDCCH (and / or PDSCH) when the channel idles through one use LBT (25 shots) of 25 usec (using a timing gap provided by the terminal emptying the last symbol). It means that you can.
  • the base station i) a higher layer signal (eg, RRC signaling) or ii) a higher layer signal and an L1 (physical layer) signal (
  • a higher layer signal eg, RRC signaling
  • a higher layer signal and an L1 (physical layer) signal
  • the configured grant type 1 Configured grant type 1, hereinafter abbreviated to type 1
  • type 2 Configured grant type 2, below
  • SFN system frame number
  • MCS modulation coding scheme
  • TBS transport block size
  • Type 2 sets the period and power control parameters of the grant set through an upper layer signal such as RRC, and information on the remaining resources (for example, offset of initial transmission timing and time / frequency resource allocation, DMRS parameter, MCS / TBS) Etc.) is a method indicated through the activation DCI, which is an L1 signal.
  • the biggest difference between the set grant scheme of AUL and NR of LTE LAA is the presence or absence of the HARQ-ACK feedback transmission method for PUSCH transmitted by the UE without the UL grant and the UCI transmitted together in PUSCH transmission.
  • information such as HARQ ID, NDI, and RV is transmitted as AUL-UCI in LTE LAA whenever AUL PUSCH is transmitted.
  • the UE recognizes / identifies the UE using time / frequency resources and DMRS resources used for PUSCH transmission, whereas in LTE LAA, it is explicitly specified in AUL-UCI transmitted along with PUSCH along with DMRS resources.
  • the terminal is recognized / identified using the included terminal ID.
  • the terminal reports HARQ-ACK information for each transport block (TB) or code block group (CBG), and the base station is configured in TB or CBG units ( Re)
  • TB transport block
  • CBG code block group
  • Re Re
  • a proposal for a method of adjusting contention window size (CWS) in random back-off based downlink (DL) LBT and uplink (UL) LBT processes do.
  • wireless communication systems such as 3GPP LTE-A are considering using unlicensed bands for cellular communication.
  • a method of supporting carrier aggregation is extended by placing a primary cell (PCell) and a secondary cell (SCell). Therefore, it supports a method of operating a licensed-assisted access (LAA) secondary cell in an unlicensed band near 2.4 GHz or 5 GHz, which is mainly used by systems such as Wi-Fi.
  • the primary cell may mean a carrier (or cell) that provides functions such as RRC connection and re-establish, mobility, random access, and system information.
  • Secondary cell may mainly mean a carrier (or cell) that provides PDSCH / PUSCH-based data transmission function.
  • the unlicensed band may assume a method of transmitting / receiving wirelessly through competition between communication nodes, and other communication nodes do not transmit signals by performing channel sensing before each communication node transmits signals. You may be asked to confirm. For convenience, such an operation is called a listen before talk (LBT), and an operation for checking whether another communication node transmits a signal may be defined as carrier sensing (CS) or clear channel assessment (CCA).
  • LBT listen before talk
  • CS carrier sensing
  • CCA clear channel assessment
  • the CCA threshold (that is, the threshold for determining the CCA) is specified as -62 dBm for a non-Wi-Fi signal and -82 dBm for a Wi-Fi signal. . This may mean that a STA or an access point (AP), for example, does not transmit a signal to prevent interference when a signal other than Wi-Fi is received at a power (or energy) of -62 dBm or more. .
  • LBT random backoff based LBT.
  • LBT based on a random backoff sets (arbitrarily) a counter value called a back-off counter in a range called a contention window (CW) size, and sets CCA in a plurality of time slots.
  • CW contention window
  • Cat. 4 a random backoff-based LBT scheme called Category 4 (Cat. 4) may be introduced as a DL LBT operation.
  • Cat. LBT parameters for 4 DL LBT are Defer period length and contention window size value for each class for a total of 4 channel access priority classes as shown in Table 5 above.
  • a maximum channel occupancy time (MCOT) value, and a (corresponding) traffic type may be determined.
  • the base station performs random backoff using LBT parameters determined according to the channel access priority class, and when the channel is accessed after completing the random backoff, signal transmission may be performed within MCOT.
  • the contention window size may be adjusted. For example, the first subframe (SF) in the most recent downlink transmission burst (DL TX burst) HARQ-ACK is available as a reference subframe (Reference SF), HARQ-ACK in the reference subframe Based on the results, you can resize the competing window.
  • the DL TX burst may mean a series of downlink transmissions.
  • the base station determines whether the HARQ-ACK of 80% or more is a NACK. If the HARQ-ACK of 80% or more is a NACK, it is determined that a collision has occurred, and the competition window promised in advance The size of the contention window is increased to the size of the contention window that is next to the currently applied contention window size in the size set. ii) Otherwise, it is determined that there is no collision and the contention window size can be initialized to a minimum value (eg, CW min ).
  • a minimum value eg, CW min
  • the occurrence of NACK (above a certain ratio) in the first subframe transmitted is that the contention window size is insufficient, so that different nodes transmit simultaneously. It is based on the assumption that it can be judged as a case.
  • a single CCA slot-based LBT (hereinafter, one-shot LBT) performing only uplink signal (eg, PUSCH) transmission by looking at a CCA slot with a length of 25us and Table 7 below and A method of applying a category 4 LBT (hereafter Cat. 4 LBT) utilizing LBT parameters defined as four LBT priority classes was introduced.
  • Table 7 below shows a set of deferral periods for each LBT priority class, a contention window minimum / maximum value, a maximum channel occupancy time (MCOT) value, and a contention window size set in the order of the columns.
  • LAA UL there is no separate channel such as PHICH to inform the UE of HARQ-ACK information for PUSCH through the introduction of an asynchronous HARQ procedure, and the exact HARQ-ACK information in the UL LBT process is a competition window. It cannot be used for resizing. Therefore, in the UL LBT process, when the UL grant is received in the n-th subframe, the first subframe of the most recent UL transmission burst before the (n-3) th subframe is set as a reference subframe, and the reference subframe The contention window size was adjusted based on the NDI for the HARQ process ID corresponding to.
  • the base station toggles one or more (per transmission block) NDI (or instructs retransmission for one or more transmission blocks (TB))
  • NDI or instructs retransmission for one or more transmission blocks (TB)
  • the contention window size is increased to the next contention window size that is currently applied within the previously set contention window size. Otherwise, it is assumed that the PUSCH in the reference subframe is successfully transmitted (without collision with other signals) and the contention window size is initialized to the minimum value (eg, CW min ).
  • NR New RAT
  • the NR system is intended to support a plurality of logical networks in a single physical system, and thus is designed to support services (e.g., eMBB, mMTC, URLLC, etc.) having various requirements.
  • services e.g., eMBB, mMTC, URLLC, etc.
  • a transport block (TB) is transmitted through a physical data shared channel (PDSCH), which is a physical channel for data transmission
  • PDSCH physical data shared channel
  • CBs code blocks
  • a code block group (CBG) may be set, and HARQ-ACK transmission in the CBG unit and / or (re) transmission in the CBG unit may be performed.
  • the UE reports HARQ-ACK information for each CBG, only some CBGs having HARQ-ACK as NACK can be collected and retransmitted.
  • the HARQ-ACK transmission time (hereinafter referred to as HARQ-ACK timing) based on the PDSCH reception time may be indicated to the UE through downlink control information (DCI), which is a physical layer control signal.
  • DCI downlink control information
  • the base station presets a plurality of HARQ-ACK timing values to a UE as an upper layer signal such as RRC signaling, and schedules a PDSCH with a DL scheduling DCI, and a HARQ-ACK timing value for applying to the PDSCH.
  • One of the HARQ-ACK timing values set as the upper layer signal may be selected / indicated through a specific bit field in the DL scheduling DCI.
  • the base station sets a plurality of PUSCH timing values to higher layer signals such as RRC signaling in advance, and schedules the PUSCH with the UL grant.
  • PUSCH timing value for transmitting PUSCH one of the PUSCH timing values set as the upper layer signal may be selected / indicated through a specific bit field in the UL grant.
  • a series of signals transmitted by a transmitting node within a maximum COT after an LBT operation is referred to as a transmission burst.
  • a scheduling resource unit in the time axis (for TB transmission) is referred to as a slot (or subframe).
  • 19 illustrates a method of adjusting CWS in a downlink LBT process.
  • a base station transmits downlink data to a terminal (S10).
  • the UE transmits HARQ-ACK information for a specific DL transmission resource through an LBT process (S20) (S30).
  • the base station may perform downlink data retransmission or new transmission to the terminal through the LBT process (S40) (S50).
  • S40 a process of adjusting the CWS may be included with reference to HARQ-ACK information for the specific DL transmission resource.
  • the base station can (dynamically) indicate the HARQ-ACK timing to the UE, and when referring to the HARQ-ACK corresponding to a specific DL transmission resource for CWS adjustment in the DL LBT process, the (HARQ-ACK reference target) )
  • a reference DL resource A method of setting a specific DL transmission resource (hereinafter referred to as a reference DL resource) is proposed as follows.
  • At least one of the following methods may be used to determine / set the specific DL transmission resource (Reference DL resource) related to CWS (Contention Window Size) adjustment in the DL LBT process of S40.
  • the meaning that the HARQ-ACK is available may mean one of the following.
  • the T may be defined only in the first transmission slot (or subframe) of the most recent downlink transmission burst available for HARQ-ACK.
  • the T may start from the first symbol among PDSCH data symbols included in the COT for each UE, and thus may be different for each UE or different for each SCS (subcarrier interval). That is, if a DMRS or PDCCH symbol is located between the start symbol of the COT and the first data symbol of the PDSCH, T may start from the first data symbol of the PDSCH immediately after the DMRS or PDCCH.
  • HARQ-ACK for a transmission in which HARQ-ACK is not available in a downlink transmission burst may be ignored or considered as NACK, where X is a predetermined value or a base station signal of a higher layer (eg, RRC Signaling) or a dynamic control signal (eg, DCI (downlink control information)).
  • X is a predetermined value or a base station signal of a higher layer (eg, RRC Signaling) or a dynamic control signal (eg, DCI (downlink control information)).
  • the meaning that the HARQ-ACK is available may mean that a time corresponding to the HARQ-ACK timing has passed since PDSCH scheduling (corresponding to HARQ-ACK).
  • the base station from the symbol from which the COT of the most recent downlink transmission burst among the downlink transmission bursts in which at least one HARQ-ACK is available starts from TBs and CBGs that include all or part of a certain time period T. Let us assume that the available HARQ-ACKs for CWS are used for CWS control.
  • FIG. 20 illustrates a transport block or code block group used for contention window scaling in the first slot in a downlink transmission burst.
  • terminal 1 when CBG-based DL (re) transmission is not set or scheduled in DCI format 1_0 even if it is set) is 1 TB transmission
  • terminal 2 CBG-based DL (re) transmission is not set Even if it is set or not, if DCI format 1_0 is scheduled) 2 TB transmission
  • terminal 3 if CBG based DL (re) transmission is set and scheduled in DCI format 1_1) 4 CBG (4 CBG per TB)
  • Terminal 4 when CBG-based DL (re) transmission is set and scheduled in DCI format 1_1) may have transmitted 8 CBGs (4 CBGs per TB).
  • HARB-ACK per TB for TB1 and TB2 of UE2 and TB2 of UE2 and CBG1, CBG2 of UE3, and CBG1, CBG2 of TB1 of UE4, which include all or part of the time interval T HARB-ACK per (CBG) for CBG (s) of CBG1 and CBG2 constituting TB2 may be used for CWS control. That is, HARQ-ACK of the shaded portion in FIG. 20 may be used for the contention window size.
  • the meaning that the HARQ-ACK is available may mean one of the following.
  • the T may be defined only in the first transmission slot (or subframe) of the most recent downlink transmission burst available for HARQ-ACK.
  • the T may start from the first symbol among PDSCH data symbols included in the COT for each UE, and thus may be different for each UE or different for each SCS. That is, if a DMRS or PDCCH symbol is located between the start symbol of the COT and the first data symbol of the PDSCH, T may start from the first data symbol of the PDSCH immediately after the DMRS or PDCCH.
  • HARQ-ACK for a transmission in which HARQ-ACK is not available in a downlink transmission burst may be ignored or considered as NACK, where X is a predetermined value or a base station signal of a higher layer (eg, RRC Signaling) or a dynamic control signal (for example, DCI).
  • X is a predetermined value or a base station signal of a higher layer (eg, RRC Signaling) or a dynamic control signal (for example, DCI).
  • the meaning that the HARQ-ACK is available may mean that a time corresponding to the HARQ-ACK timing has passed since PDSCH scheduling (corresponding to HARQ-ACK).
  • 21 is another example of a transport block or a code block group used for contention window scaling in a first slot in a downlink transmission burst.
  • UE 1 transmits 1 TB
  • UE 2 transmits 2 TB
  • UE 3 transmits 4 CBGs (4 CBGs per TB)
  • UE 4 transmits 8 CBGs (4 CBGs per TB).
  • CBG (s) of CBG1 of CBG1 constituting TB1 of UE3 and CBG1 of TB2 constituting all of TB or CBG in time interval T and CBG (s) of CBG1 constituting TB2 CWS of HARQ-ACK per CWS Can be used for adjustment.
  • HARQ-ACK of the shaded portion may be used for the contention window size.
  • each HARQ-ACK can be calculated by weighting as follows.
  • Method of weighting only the fastest TB or CBG unit HARQ-ACK on the time axis ii.
  • a method of sequentially weighting the HARQ-ACK in TB or CBG units in a fast order on the time axis iii.
  • a method of weighting according to the degree of spread on the time axis i.
  • the effective TB or CBG unit HARQ-ACK in the above may be a HARQ-ACK selected through the above-mentioned [Suggestion Method # 1] or [Suggestion Method # 2], and the base station selects one of the bundling method and the weighting method. Each can be used to calculate the ratio for adjusting the CWS.
  • the NACK or ACK ratio must be calculated in order for the base station to perform CWS adjustment in the DL LBT process.
  • the effective HARQ-ACK selected by the above method may be a TB unit or a CBG unit, and bundling may be necessary for calculating the ratio. If all effective HARQ-ACK units are TB or CBG units, it may be calculated without bundling, and bundling may be performed per TB, per UE, or per PDSCH.
  • the weight may be given to the fastest TB or CBG unit HARQ-ACK on the time axis to be used for CWS adjustment, or the weight may be differentiated in the fast order on the time axis to be used for CWS adjustment.
  • UE 1 is [NACK] for TB 1
  • UE 2 is [NACK] for TB 1
  • [ACK] for TB 2 and UE 3 is within TB 1 [NACK, ACK, NACK, ACK] for CBG 1/2/3/4
  • UE 4 is CBG in TB 1 [ACK, NACK, NACK, ACK] for TB 2 1/2/3/4
  • CBG in TB 2 Suppose that [NACK, ACK, NACK, ACK] is reported for 1/2/3/4, and if 80% or more of the effective HARQ-ACK in interval T is NACK, CWS is increased, otherwise CWS is initialized.
  • the effective HARQ-ACK selected by the method of [suggestion method # 1] is bundled for each TB. If it is, the effective HARQ-ACK of the terminal 3 is the NACK, and the effective HARQ-ACK of the terminal 4 is the ACK (TB 1) and the NACK (TB 2), and the CBGs of the terminal 3 and the terminal 4 of the terminal 1 and terminal 2 in the time axis.
  • a specific DL transmission resource referred to for CWS control a TB unit PDSCH scheduled based on a slot and a non-slot based (2, 4 or 7 OFDM symbol)
  • a specific time period T e.g., from the symbol where the COT of the latest downlink transmission burst available for HARQ-ACK starts
  • HARQ-ACKs for slot-based TBs, non-slot-based TBs, and CBGs which are included in whole or in part, can be used for CWS control.
  • the meaning that the HARQ-ACK is available may mean one of the following.
  • the T may be defined only in the first transmission slot (or subframe) of the most recent downlink transmission burst available for HARQ-ACK.
  • the T may start from the first symbol among PDSCH data symbols included in the COT for each UE, and thus may be different for each UE or different for each SCS. That is, if a DMRS or PDCCH symbol is located between the start symbol of the COT and the first data symbol of the PDSCH, T may start from the first data symbol of the PDSCH immediately after the DMRS or PDCCH.
  • HARQ-ACK for a transmission in which HARQ-ACK is not available in a downlink transmission burst may be ignored or considered as NACK, where X is a predetermined value or a base station signal of a higher layer (eg, RRC Signaling) or a dynamic control signal (for example, DCI).
  • X is a predetermined value or a base station signal of a higher layer (eg, RRC Signaling) or a dynamic control signal (for example, DCI).
  • the meaning that the HARQ-ACK is available may mean that a time corresponding to the HARQ-ACK timing has passed since PDSCH scheduling (corresponding to HARQ-ACK).
  • 22 is another example of a transport block or code block group used for contention window size adjustment in a reference downlink resource.
  • 1 TB transmission and 1 UE are set for UE 1 (CBG-based DL (re) transmission is not set or is scheduled in DCI format 1_0 even if it is set).
  • DCI format 1_0 is transmitted 2 TB
  • terminal 3 (if CBG based DL (re) transmission is set and scheduled in DCI format 1_1) is 4 CBG (4 CBG per TB)
  • Terminal 4 (when CBG-based DL (re) transmission is set and scheduled in DCI format 1_1) transmits 8 CBGs (4 CBGs per TB)
  • terminal 5 is 2 symbols long with non-slot based scheduling
  • HARQ-ACK for each TB and TB1 of TB1 and TB2 of UE 1 and CBG1 of UE 3 are included in all or part of the time interval T
  • CBG2 and CBG (s) constituting CBG1, CBG2, and TB2 constituting TB1 of terminal 4 (CBG) has TB1 and TB2 of the HARQ-ACK and the terminal 5 can be used to control specific CWS. That is, in the example of FIG. 22, HARQ-ACK
  • non-slot-based scheduling TB1 and TB2 transmitted by UE 5 are transmitted in CBG units, as in UE3 and UE4, all CBGs including all or part of T among CBGs in each TB are referred to CWS adjustment. Can be selected as HARQ-ACK.
  • the NACK or ACK ratio may be used by the base station to perform CWS adjustment in the DL LBT process.
  • the effective HARQ-ACK selected by the above method may be a TB unit or a CBG unit, and bundling may be necessary for calculating the ratio.
  • [Suggestion method # 3] may be used for calculating HARQ-ACK bundling methods and NACK ratios of different units. Based on the results calculated in this way, the base station can reset the CWS to the minimum value or compare it to a larger CWS value in the next step by comparing it with a specific threshold.
  • a valid TB within a specific time period T (from the first data symbol) where the COT (within the first transmission slot (or subframe)) of the most recent downlink transmission burst available for HARQ-ACK starts (from the first data symbol) or
  • the CBG unit HARQ-ACK is selected and processed as follows to refer to CWS adjustment, or a specific time period T can be set or indicated in the reference DL resource (eg, subframe or slot).
  • min (X, Y) means a smaller value among X and Y.
  • A1 (Number of symbols occupied by valid TB or CBG) / 14
  • A2 (Number of symbols included in T among symbols occupied by valid TB or CBG) / 14
  • the valid TB or CBG unit HARQ-ACK in the above may be a HARQ-ACK selected through [Suggestion Method # 1] or [Suggestion Method # 2], and the base station calculates the NACK rate Z by this proposed method and criterion (criterion).
  • the CWS can be increased or reset accordingly.
  • the T may be defined only in the first transmission slot (or subframe) of the most recent downlink transmission burst available for HARQ-ACK.
  • the T may start from the first symbol among PDSCH data symbols included in the COT for each UE, and thus may be different for each UE or different for each SCS. That is, if a DMRS or PDCCH symbol is located between the start symbol of the COT and the first data symbol of the PDSCH, T may start from the first data symbol of the PDSCH immediately after the DMRS or PDCCH.
  • CORESET and a plurality of TBs set in a reference DL resource, and TB and CBG to be used for CWS adjustment.
  • a 3-symbol CORESET is set in a reference DL resource over some frequency domains, and TB1, TB2, TB4, and slot-based TB3 scheduled based on non-slots (mini-slots) are provided to a plurality of UEs. Can be scheduled. And, T can be set to 2-symbol.
  • T starts from the first symbol of the PDSCH data symbols included in the COT, and is set or indicated except for the DMRS or PDCCH symbols between the COT start symbol and the first data symbol of the PDSCH. ), T is set immediately after the CORESET symbol, and TB2 and CBG1 overlap, and in the lower frequency region 271 where CORESET is not set, T is set from the first PDSCH symbol where COT starts, so TB1 and TB3 are set. Overlap. Therefore, if HARQ-ACK to be referred to CWS control is selected by the method of [suggestion method # 1], TB1, TB2, CBG1, and TB3 may be selected as effective HARQ-ACK.
  • FIG. 24 shows an example of setting of a TRESET and a plurality of TBs and a CORESET set in a reference DL resource.
  • DMRS or CORESET when DMRS or CORESET exists between the COT start symbol and the first data symbol of the PDSCH, it may be set in a symbol unit to the T value set after the corresponding DMRS and CORESET. That is, in FIG. 23, the T region set in the lower portion 271 of the frequency domain is matched in symbol units with the T region of the upper portion 272 to set T as shown in FIG. 24. That is, the T value set after DMRS or CORESET can be set by matching symbol by symbol.
  • the number of symbols occupied in the reference DL resource and the number of symbols included in the T for each TB or CBG may be different, when calculating the NACK ratio with the selected effective HARQ-ACKs, it is calculated by converting to the effective HARQ-ACK as follows. Can be reflected later.
  • 25 illustrates a method of calculating effective HARQ-ACK.
  • [proposed method # 1] that is, a method in which all CBGs and TBs completely included or overlapped in T are selected as valid HARQ-ACKs, and HARQ-ACK for TB / CBGs overlapping with T is valid.
  • effective HARQ-ACK calculated by four methods is as follows.
  • A1 (Number of symbols occupied by valid TB or CBG) / 14
  • A2 (Number of symbols included in T among symbols occupied by valid TB or CBG) / 14
  • UE2 may be a UE that transmits a plurality of TBs through multiple antennas.
  • a single HARQ-ACK may be spatially bundled through an AND operation.
  • the effective HARQ-ACK calculated as described above may be calculated by reflecting the number of HARQ-ACKs and NACKs corresponding to the ratio to the denominator molecule when calculating the NACK ratio.
  • 26 illustrates a method of adjusting CWS in an uplink LBT process.
  • the terminal transmits uplink data to a base station (network) (S100).
  • the base station transmits the decoding result (NDI toggle, CBTTI) for a specific uplink transmission resource to the terminal through the LBT process (S200) (S300).
  • the terminal may perform an uplink data retransmission or a new transmission to the base station through an LBT process (including a process of adjusting CWS with reference to a decoding result for the specific uplink transmission resource) (S400) (S500).
  • At least one of the following methods may be used to determine / set the specific uplink transmission resource related to CWS (Contention Window Size) adjustment in the UL LBT process of S400.
  • CWS Contention Window Size
  • the specific UL transmission (which becomes a reference target for whether to retransmit the HARQ process)
  • the resource (that is, the reference UL resource) may be set as follows.
  • the M value and T may be predetermined values or may be values set by a base station through a higher layer signal (eg, RRC signaling) or a dynamic control signal (eg, DCI).
  • the T may start from the first symbol among PUSCH data symbols included in the COT for each UE, and thus may be different for each UE or different for each SCS. That is, if the DMRS is located between the start symbol of the COT and the first data symbol of the PUSCH, T may start from the first data symbol of the PUSCH immediately after the DMRS.
  • the DMRS may be transmitted in a symbol other than the first symbol of the PUSCH, and the reference UL resource may be from the first data symbol to the T of the PUSCH other than the DMRS symbol, or from the first data symbol of the PUSCH other than the DMRS symbol to the DMRS. It may also be a T time resource excluding symbols.
  • T may be a PUSCH in which CBG unit transmission is scheduled in the first slot of the UL burst. Since T starts from the first data symbol excluding the DMRS or PDCCH of COT start, it starts from the symbol after the DMRS symbol.
  • FIG. 27 (a) when some CBGs are included in T, as in A) of the proposed method # 4, all decoding results for the corresponding CBGs can be effectively referred to CWS adjustment.
  • FIG. 27 (b) as in the proposed method # 4 B), only the decoding result of CBG1 including the entire CBG in T can be effectively referred to CWS adjustment. If T is set or indicated as the entire slot duration, all of the decoding results in the first (transmission) slot of the UL transmission burst can be effectively referred to CWS adjustment in the above methods A) and B). .
  • the CWS of the terminal may be adjusted based on the decoding result of the effective CBG selected through the above-mentioned [Suggestion method # 4].
  • the use of the decoding result of the effective TB or CBG for CWS adjustment is based on whether the NDI is toggled in the UL grant having the same HARQ process ID and CBTTI with respect to the HARQ process ID of the PUSCH scheduled in the set time interval T. It can mean initializing or incrementing the CWS.
  • Some valid CBG index (s) may be the fastest CBG index on the time axis or a specific CBG index set or indicated by the base station, to reset the CWS (i.e., receiving the effective CBG index (s) in the gNB) It is assumed that this is an ACK).
  • the effective CBG index (es) may mean representative CBGs or all selected CBGs among the CBGs selected by [Proposed Method # 4] described above.
  • the method may be applicable on the premise that when the base station fails to receive a specific CBG index (s), the next retransmission scheduling always instructs retransmission of the corresponding CBG (s).
  • This principle can be applied to the CBG index (es) in time of all slots or the first slot of the UL burst considered by the base station.
  • the base station may schedule the CBG unit PUSCH to the UE with a specific HARQ process ID through the UL grant, and may instruct retransmission of only some CBGs that have failed decoding through the CBGTI. For example, if the base station transmits UL grant scheduling the same HARQ process ID X for the CBG unit PUSCH scheduled by HARQ process ID X, if the NDI value is toggled, the UE can recognize the new data scheduling and initialize the CWS. have. If the NDI value is not toggled and CBGTI does not indicate retransmission for the valid CBG (s) selected by [Proposed Method # 4], the valid CBG (s) may be regarded as an ACK and CWS may be initialized. Conversely, if the NDI value is not toggled and instructs retransmission of valid CBG (s) through CBGTI, the UE may assume the valid CBG (s) as NACK and adjust the CWS to a higher value.
  • the specific UL transmission resource (which becomes a reference target of whether to retransmit the HARQ process) (Ie, the reference UL resource) can be set as follows.
  • the PUSCH scheduled for the specific UL transmission resource may include a slot-based TB or a plurality of CBGs or a plurality of non-slot-based TBs.
  • a UL transmission burst (in the first (transmission) slot (or subframe) A) that includes the most recent UL transmission slot (or subframe) prior to the UL grant reception M slots (or subframes) A) From the symbol where the COT starts, the decoding results for TBs and CBGs that include all or part in a specific time interval T starting from the first data symbol are used for CWS adjustment, or B) the reference UL set as above. Only the decoding result including the entire TB or CBG within a specific time interval T from the symbol where the COT starts in the resource can be used for CWS adjustment.
  • the M value and the T value may be a predetermined value or a value set by a base station through a higher layer signal (eg, RRC signaling) or a dynamic control signal (eg, DCI).
  • the T may start from the first symbol among PUSCH data symbols included in the COT for each UE, and thus may be different for each UE or different for each SCS. That is, if a DMRS is located between the start symbol of the COT and the first data symbol of the PUSCH, T may start from the first data symbol of the PUSCH immediately after the DMRS.
  • the DMRS may be transmitted in a symbol other than the first symbol of the PUSCH, and the reference UL resource may be a PUSCH first data symbol to T that is not a DMRS symbol or a DMRS symbol from a PUSCH first data symbol that is not a DMRS symbol. It may also be a T-time resource.
  • a plurality of non-slot-based PUSCHs may be scheduled in a specific UL transmission resource.
  • CBG-based (re) transmission is set, TB1 and TB2 in FIG. 28 may be configured as a single or multiple CBGs.
  • T may be a T time resource excluding the DMRS symbol from the first data symbol of the PUSCH rather than the DMRS symbol, it may be equal to the sum of data symbols excluding the DMRS symbol.
  • the corresponding symbol length may also be included in T. Therefore, in the example, if DMRS is mapped to a symbol in front of TB 2, the corresponding symbol may not be included in T and may be set to be T including all subsequent data symbols.
  • 29 is another example illustrating TB used for CWS adjustment.
  • both decoding results (HARQ-ACK) in the first (transmission) slot of the UL transmission burst can be effectively referenced to the CWS adjustment.
  • the above [Suggestion Method # 5] may be used to adjust the CWS of the terminal.
  • the first (transmission) subframe of the UL transmission burst including the most recent UL subframe before the n-3th subframe is set as a reference subframe. do. This is a timeline considering the processing time of the base station for scheduling the retransmission or new UL transmission by transmitting the UL grant after the base station receives and decodes the PUSCH sent by the UE.
  • the UE adjusts its CWS through the NDI in the UL grant containing feedback information for the PUSCH transmitted in the reference UL subframe.
  • NDI When NDI is toggled, new data is scheduled and the previous PUSCH transmission is considered successful and the CWS is considered. Initialize. And if NDI is not toggled, NACK is considered as feedback and CWS is increased to a higher value.
  • the HARQ-ACK feedback timing may be faster depending on the processing time capability of the base station and the terminal, so that K may be smaller than 3.
  • autonomous UL access may be introduced in which a terminal can transmit UL through a preset resource without UL grant.
  • the base station may transmit HARQ-ACK feedback to the UE through downlink feedback information (AUL-DFI) or UL grant for the AUL PUSCH transmitted by the UE.
  • the UE adjusts the CWS based on the feedback information. If the AUL-DFI or UL grant is not received for more than N subframes for the AUL PUSCH, the CWS is increased to a higher value.
  • burst length is the length of the UL transmission burst transmitted by the i th
  • X is a CWS adjustment timer, and expires If possible, it performs CWS adjustment and may be configured as a higher layer signal to the UE.
  • a minimum value of X may be smaller depending on the processing time capability of the base station and the terminal.
  • the transmission resource (hereinafter referred to as the UL resource) is the first (transmission) slot of the UL transmission burst including the most recent UL transmission slot (or subframe) before M slots (or subframes) based on the reception time of the UL grant. (Or subframe).
  • the M value indicated by the base station through a higher layer signal eg, RRC signaling
  • a dynamic control signal eg, DCI
  • the M value is not set or instructed by the base station, it may operate assuming a default value (for example, 3 slots).
  • the terminal may operate by assuming an M value based on its processing capability information.
  • the M value determined based on the processing capability information is a N1 and N2 value itself or a function of a plurality of K1 and K2 set to the terminal (for example, min (K1) or min (K2) or min (min ( K1), min (K2))).
  • the M may mean / imply the time until the base station receives the PUSCH and obtains the decoding result for the corresponding PUSCH, and in the NR, the M value is not fixed (ie, the slot length and transmission band set for each UE), unlike LTE. In consideration of), an independent M value for each terminal may be set through a higher layer signal or DCI.
  • the first (transmission) subframe (or slot) of the UL transmission burst including the most recent UL transmission subframe (or slot) before T1 ms based on the UL grant reception time may be set as a reference UL resource. .
  • the UE receives the UL UL received in slot n (or subframe n) several slots (or subframes) (ie, before M slots) and is the latest UL.
  • the first (transmission) slot of the UL transmission burst including the slot may be operated based on capability information or a default value.
  • the terminal initially reports the capabilities N1 and N2 values related to its processing time to the base station.
  • N1 is a symbol unit time from the PDSCH reception to PUCCH transmission
  • N2 is a symbol unit time from the PDCCH reception to PUSCH transmission.
  • the base station instructs the UE to indicate the time K1 in the slot unit for transmitting the PUCCH after receiving the PDSCH and the time K2 in the slot unit for transmitting the PUSCH after receiving the PDCCH in consideration of the processing time capability of the terminal and the timing advanced (TA). do.
  • TA timing advanced
  • the terminal N1 and N2 values determined based on the processing capability information or a function of a plurality of K1 and K2 set to the terminal for example, min (K1) or min (K2) or min (min (K1), As one of the values determined by min (K2))
  • an M value may be assumed and operated.
  • N slot a specific time (let this time be referred to as N slot)
  • the terminal performs CWS adjustment, and the N value may be set as follows.
  • N max (competition window resizing timer X, Ti burst length + M).
  • the M value may be a predetermined value (for example, a value previously defined or determined in a standard specification) or a value that can be set / instructed by an RRC or DCI or a combination thereof from a base station.
  • M can be an integer or a natural number.
  • the UE When the UE does not set / instruct the M value from the base station, it may operate assuming a default value (e.g., 1).
  • CGU set grant
  • the terminal may receive candidate resources capable of transmitting a signal in an unlicensed band from a base station (network).
  • the candidate resources may be set, for example, in a manner that informs the period, the offset in the frame, the start symbol and length of the PUSCH, the number of repetitions, etc. It may be set.
  • the setting may be provided through RRC signaling.
  • necessary resource-related parameters may be provided through DCI indicating CGU activation and may be applied to each of the candidate resources.
  • Each of the candidate resources may be set in units of OFDM symbols, slots, and subframes. The number of repetitions may be interpreted as the number of resources configured in the period.
  • the terminal performs the LBT process before the start position of each candidate resource, and if the LBT is successful, the terminal may transmit data (CGU PUSCH) using the candidate resource.
  • CGU PUSCH data
  • a grant for each candidate resource is not separately provided, and in this sense, the CGU scheme may be referred to as a grant-free scheme.
  • the UE may adjust the CWS and apply the adjusted CWS to the LBT later.
  • the specific time may be a larger value among M (M is a natural number) plus the timer value and the transmission time of the data.
  • M is a natural number
  • the M value may be a predetermined value or a value set by the base station.
  • the M value may be a predetermined value (for example, a value previously defined or determined in a standard specification) or a value that can be set / instructed by an RRC or DCI or a combination thereof from the base station, and M is an integer or a natural number.
  • the M value may be set to a value other than 1 or set / instructed.
  • the M value may be set / instructed as one of a plurality of predetermined candidate values.
  • the UE When the UE does not set / instruct the M value from the base station, it may operate assuming a default value (e.g., 1).
  • the UE can adjust the CWS.
  • the 'Ti burst length' may mean a time length of continuous transmission performed on Ti.
  • the N value may be set by at least one of the following examples.
  • An independent X value for each terminal may be set through a higher layer signal or DCI.
  • the X value is N1 and N2 values themselves or a function of a plurality of K1 and K2 set to the terminal (for example, min (K1) or min (K2) or min (min (K1), min (K2)) or It may be a value determined by min (K1) +1 or min (K2) +1 or min (min (K1), min (K2)) + 1).
  • N1 is a symbol unit time taken from the PDSCH reception to PUCCH transmission
  • N2 is a symbol unit time taken to transmit the PUSCH after PDCCH reception, and may be a value dependent on UE capability.
  • K1 is a slot unit time for transmitting PUCCH after receiving PDSCH and K2 is a slot unit time for transmitting PUSCH after receiving PDCCH.
  • K1 and K2 may have various candidate values. Therefore, min (K1) may mean the smallest candidate value among various candidate values of K1.
  • min (K2) may mean the smallest candidate value among various candidate values of K2.
  • the terminal may operate assuming a default value (for example, 5 ms).
  • 31 illustrates a method of adjusting the contention window size for a terminal to access a channel in an unlicensed band.
  • the terminal transmits data from the preset resource to the base station (S1210).
  • the preset resource may be a resource configured in the above-described CGU method, and for this purpose, a radio resource control (RRC) signal including information indicating a cycle related to the preset resource may be received from a base station. .
  • RRC radio resource control
  • the LBT process may be, for example, random backoff based LBT. That is, a counter value called a back-off counter is set (arbitrarily) in a range called a contention window size (CWS), and CCA is performed in a plurality of time slots so that a specific time slot is channel idle ( Channel Idle), (eg, if the measured value is less than or equal to a certain value), decreases the backoff counter value one by one and then performs an LBT process that allows signal transmission when the backoff counter value becomes 0.
  • CWS contention window size
  • the terminal attempts to detect feedback for the data for a specific time (S1220).
  • the feedback may be uplink grant or ACK / NACK (acknowlegement / negative-acknowledgement) information for the data.
  • the uplink grant may schedule retransmission for the data, or may schedule a new transmission rather than the data.
  • the terminal can know whether the transmission of the data was successful or failed according to the uplink grant. Whether to schedule retransmission for the data or to schedule transmission of new data may be identified based on whether a specific field included in the uplink grant, for example, a new data indicator (NDI) field is toggled.
  • NDI new data indicator
  • the timer value may be set through an RRC signal or downlink control information (DCI).
  • the timer value set for the terminal may be a value independent of the timer value set for other terminals.
  • the timer value is a slot unit time taken for the UE to transmit a physical uplink control channel (PUCCH) after receiving a physical downlink shared channel (PDSCH).
  • PUCCH physical uplink control channel
  • K1 and the UE after receiving a physical downlink control channel (physical donwlink control channel: PDCCH) may be provided as a function of time K2 in slot units for transmitting a physical uplink shared channel (PUSCH) have.
  • the timer value may be provided as an N1 or N2 value (or a function of N1 and N2).
  • the terminal adjusts the size of the contention window used to determine whether to access the unlicensed band to the channel (S1230). If the feedback is not detected within the specific time, the contention window size may be increased.
  • a default value may be applied as the timer value.
  • N max (competition window resizing timer X, T i burst length + 1)
  • the processing time may be relatively shortened according to the capabilities of the terminal and the base station, so the X value, which is the standard for CWS adjustment, may also be shorter than LTE.
  • the X value needs to be changed in various ways. In consideration of this, the base station can set an independent X value for each terminal through a higher layer signal or DCI.
  • N1 and N2 values themselves or a function of a plurality of K1 and K2 set to the terminal (for example, min (K1) or min (K2) or min (min (K1), min (K2)) or min (K1) ) +1 or min (K2) +1 or min (min (K1), min (K2)) + 1).
  • the terminal may operate by assuming that the default value (for example, 5 ms) is the contention window resizing timer X value.
  • mode 1 and mode 2 UL partial subframe transmission in which a base station can start transmission on a # 7th (or between a # 7th and a # 8th symbol) symbol in the COT shared by the base station to the UE.
  • # 7th or between a # 7th and a # 8th symbol
  • each mode is set to a higher layer signal, RRC, and is dynamically transmitted to the UE through UL grant.
  • RRC Radio Resource Control
  • transmission can be started upon success by attempting LBT at the start time of each subframe and the # 7 symbol.
  • LBT is attempted only in the # 7 symbol in the first subframe to start transmission when successful, and LBT is performed only in the start time of the subframe in the remaining subframes.
  • N consecutive UL subframes are allocated in the COT shared by the base station to the terminal and mode 1 is allowed (or scheduled) to the terminal and is type 2
  • the maximum number of LBT attempts may be limited to N + 1. That is, in the case of mode 1 in a plurality of N consecutive subframes, since LBT can be performed at the first and second slot start positions of each slot, if LBT is performed at all starting points, a maximum of 2N type 2 LBTs are performed. It can be done, but the maximum number of Type 2 LBTs can be limited to N + 1, considering coexistence with Wi-Fi.
  • the X1 or X2 may be set differently according to the priority of the UL channel constituting the UL burst, and the higher the priority, the larger the X1 or X2 value may be set.
  • the minimum number of LBTs for the UL channel in which the base station has a specific priority may be allocated.
  • the method may be applied when all or part of the slots in one consecutive UL burst are set / instructed in a plurality of start candidate positions in the slot.
  • the proposed method may be applied to each section by dividing the section into one or more UL bursts even within one continuous UL burst.
  • the burst is composed of UL bursts having the same priority, but UL bursts composed only of UL channels (for example, PUCCH) having a higher priority than the PUSCH mentioned in the example above, the maximum number of types 2 LBT allowed times W + X2 (
  • X value may be set differently according to the priority of the UL channel as X2> X1).
  • slot the W + X LBT is performed may differ depending on the implementation of the UE, and if all of the maximum type 2 LBT times W + X times are attempted at a certain point in the UL burst, the remaining slots scheduled will attempt LBT. UL transmission is not possible.
  • a type 2 LBT attempt may be allowed up to W + X times, as in the case where UL bursts are configured with UL channels having the same priority. have.
  • the maximum number of Type 2 LBTs may be allowed up to W + X + N times.
  • the N value is the number of additional Type 2 LBTs for the UL channel having a specific priority. For example, if there are 4 PUSCH-scheduled slots and 1 PUCCH-scheduled slot in a UL burst composed of 5 slots, the maximum type 2 LBT number allowed for PUSCH transmission has higher priority than PUSCH.
  • the type 2 LBT number N for PUCCH is added to perform type 2 LBT up to W + X + N times.
  • the base station may allocate the minimum Type 2 LBT number to the UL channel having a specific priority. For example, within a UL burst composed of 5 slots, when 4 PUSCH-scheduled slots and 1 PUCCH-scheduled slot are allowed, and the maximum number of W + X type 2 LBT attempts is allowed, PUCCH transmission is performed.
  • the type 2 LBT for can be assigned to be performed at least three times.
  • the maximum type 2 LBT number allowed for PUSCH transmission may be W + X-3 times except for the number of LBT attempts for PUCCH transmission among all W + X.
  • the maximum number of Type 2 LBTs may be defined for each priority of UL channels constituting the UL burst.
  • the content of the present disclosure is not limited to the uplink or downlink between the base station and the terminal, and the proposed method may be used for direct communication between the terminals.
  • a base station transmits a predefined signal (eg, a physical layer signal or a higher layer signal) to a terminal or a transmitting terminal to a receiving terminal. Rules can be defined to inform you through.
  • a predefined signal eg, a physical layer signal or a higher layer signal
  • the content of the present disclosure is not limited to direct communication between terminals, and may be used in uplink or downlink.
  • the proposed method may be used by a base station or a relay node.
  • a base station transmits a predefined signal (eg, a physical layer signal or a higher layer signal) to a terminal or a transmitting terminal to a receiving terminal. Rules can also be defined to inform you through.
  • a predefined signal eg, a physical layer signal or a higher layer signal
  • 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, the second wireless device 200 ⁇ is ⁇ wireless device 100x, base station 200 ⁇ and / or ⁇ wireless device 100x), wireless device 100x in FIG. ⁇ .
  • 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.
  • 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.
  • 33 illustrates a signal processing circuit for a transmission signal.
  • the signal processing circuit 1000 may include a scrambler 1010, a modulator 1020, a layer mapper 1030, a precoder 1040, a resource mapper 1050, and a signal generator 1060.
  • the operations / functions of FIG. 33 may be performed in processors 102, 202 and / or transceivers 106, 206 of FIG.
  • the hardware elements of FIG. 33 can be implemented in the processors 102, 202 and / or transceivers 106, 206 of FIG. 32.
  • blocks 1010 to 1060 may be implemented in processors 102 and 202 of FIG. 32.
  • blocks 1010 to 1050 may be implemented in the processors 102 and 202 of FIG. 32
  • block 1060 may be implemented in the transceivers 106 and 206 of FIG. 32.
  • the codeword may be converted into a wireless signal through the signal processing circuit 1000 of FIG. 33.
  • the codeword is an encoded bit sequence of an information block.
  • the information block may include a transport block (eg, UL-SCH transport block, DL-SCH transport block).
  • the radio signal may be transmitted through various physical channels (eg, PUSCH, PDSCH).
  • the codeword may be converted into a scrambled bit sequence by the scrambler 1010.
  • the scramble sequence used for scramble is generated based on the initialization value, and the initialization value may include ID information of the wireless device.
  • the scrambled bit sequence can be modulated into a modulated symbol sequence by the modulator 1020.
  • the modulation method may include pi / 2-Binary Phase Shift Keying (pi / 2-BPSK), m-Phase Shift Keying (m-PSK), m-Quadrature Amplitude Modulation (m-QAM), and the like.
  • the complex modulation symbol sequence may be mapped to one or more transport layers by the layer mapper 1030.
  • the modulation symbols of each transport layer may be mapped to the corresponding antenna port (s) by the precoder 1040 (precoding).
  • the output z of the precoder 1040 can be obtained by multiplying the output y of the layer mapper 1030 by the precoding matrix W of N * M.
  • N is the number of antenna ports and M is the number of transport layers.
  • the precoder 1040 may perform precoding after performing transform precoding (eg, DFT transformation) on complex modulation symbols. Further, the precoder 1040 may perform precoding without performing transform precoding.
  • the resource mapper 1050 may map modulation symbols of each antenna port to time-frequency resources.
  • the time-frequency resource may include a plurality of symbols (eg, CP-OFDMA symbol, DFT-s-OFDMA symbol) in the time domain, and may include a plurality of subcarriers in the frequency domain.
  • the signal generator 1060 generates a radio signal from the mapped modulation symbols, and the generated radio signal can be transmitted to other devices through each antenna. To this end, the signal generator 1060 may include an Inverse Fast Fourier Transform (IFFT) module and a Cyclic Prefix (CP) inserter, a Digital-to-Analog Converter (DAC), a frequency uplink converter, etc. .
  • IFFT Inverse Fast Fourier Transform
  • CP Cyclic Prefix
  • DAC Digital-to-Analog Converter
  • the signal processing process for the received signal in the wireless device may be configured as the inverse of the signal processing processes 1010 to 1060 of FIG. 33.
  • a wireless device eg, 100 and 200 in FIG. 32
  • the received radio signal may be converted into a baseband signal through a signal restorer.
  • the signal recoverer may include a frequency downlink converter (ADC), an analog-to-digital converter (ADC), a CP remover, and a Fast Fourier Transform (FFT) module.
  • ADC frequency downlink converter
  • ADC analog-to-digital converter
  • CP remover a CP remover
  • FFT Fast Fourier Transform
  • the baseband signal may be restored to a codeword through a resource de-mapper process, a postcoding process, a demodulation process, and a de-scramble process.
  • the codeword can be restored to the original information block through decoding.
  • the signal processing circuit (not shown) for the received signal may include a signal restorer, a resource de-mapper, a post coder, a demodulator, a de-scrambler and a decoder.
  • 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. 29, 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.
  • various components such as a camera and a Universal Serial Bus (USB) port may be additionally included in the terminal.
  • the camera can be connected to a processor.
  • the channel coding technique may mainly include a low density parity check (LDPC) coding technique for data and a polar coding technique for control information.
  • LDPC low density parity check
  • the network / terminal may perform LDPC coding on PDSCH / PUSCH having two base graph (BG) support.
  • BG1 may be for a mother code rate 1/3
  • BG2 may be for a mother code rate 1/5.
  • coding techniques such as repetition coding / simpleplex coding / Reed-Muller coding can be supported.
  • the polar coding technique can be used when the control information has a length longer than 11 bits.
  • the mother code size may be 512
  • Polar coding techniques can be used for PBCH. This coding technique may be the same as that of the PDCCH.
  • the LDPC coding structure will be described.
  • LDPC code is defined as the product of (nk) null-space and n sparse parity check matrix H (null-space of a (nk) ⁇ n sparse parity check matrix H) (n, k) linear It is a linear block code.
  • LDPC codes applicable to some implementations of the present disclosure may be as follows.
  • 35 is an example of a parity check matrix represented by a protograph.
  • FIG. 35 shows a parity check matrix for an association relationship between a variable node and a check node, which is expressed as a prototype.
  • variable nodes associated with the check node c 1 are v 1 , v 2 , v 3 , v 4 , v 6 , v 7 , and the check node associated with the variable node v8 These are c 2 , c 3 , c 4 .
  • 36 shows an example of an encoder structure for a polar code.
  • FIG. 36 (a) shows an example of a base module of the polar code
  • FIG. 36 (b) shows a base matrix
  • the polar code is known as a code capable of acquiring channel capacity in a binary-input discrete memoryless channel (B-DMC). That is, when the size N of the code block increases to infinity, channel capacity can be obtained.
  • B-DMC binary-input discrete memoryless channel
  • the encoder of the polar code can perform channel combining and channel division. Specifically, the encoder of the polar code may combine existing channels into one vector channel, or split one vector channel into a plurality of new channels.
  • existing channels may be uniform, and a plurality of new channels that divide one vector channel may be polarized.
  • DRX Discontinuous reception
  • UE user equipment
  • the DRX operation is performed within a DRX cycle indicating a time interval in which On Duration is periodically repeated.
  • the DRX cycle includes on duration and sleep duration (or chance of DRX).
  • On duration indicates a time interval during which the UE monitors the PDCCH to receive the PDCCH.
  • DRX may be performed in a Radio Resource Control (RRC) _IDLE state (or mode), RRC_INACTIVE state (or mode), or RRC_CONNECTED state (or mode).
  • RRC Radio Resource Control
  • DRX can be used to discontinuously receive the paging signal.
  • -RRC_IDLE state a state in which a radio connection (RRC connection) between a base station and a terminal is not established (established).
  • -RRC_INACTIVE state a radio connection (RRC connection) between the base station and the terminal is established, but the radio connection is deactivated.
  • -RRC_CONNECTED state A state in which a radio connection (RRC connection) is established between a base station and a terminal.
  • DRX can be basically divided into an idle mode DRX, a connected DRX (C-DRX), and an extended DRX.
  • DRX applied in the IDLE state may be referred to as an idle mode DRX, and DRX applied in a CONNECTED state may be referred to as a connected mode DRX (C-DRX).
  • C-DRX connected mode DRX
  • eDRX Extended / Enhanced DRX
  • eDRX Extended / Enhanced DRX
  • SIB1 system information
  • SIB1 may include an eDRX-allowed parameter.
  • the eDRX-allowed parameter is a parameter indicating whether idle mode extended DRX is allowed.
  • paging occasion is Paging-Radio Network Temporary Identifier (P-RNTI) (Physical Downlink Control Channel) PDCCH (addressing paging message for NB-IoT) or MPCCH (MTC PDCCH) ) Or a subframe that can be transmitted through a narrowband PDCCH (NPDCCH).
  • P-RNTI Paging-Radio Network Temporary Identifier
  • NPDCCH narrowband PDCCH
  • PO may indicate a start subframe of MPDCCH repetition.
  • the PO may indicate the start subframe of the NPDCCH repetition. Therefore, the first valid NB-IoT downlink subframe after PO is the start subframe of NPDCCH repetition.
  • One paging frame is one radio frame that may include one or more paging opportunities. When DRX is used, the UE only needs to monitor one PO per DRX cycle.
  • One paging narrow band is one narrow band in which the UE performs paging message reception. PF, PO and PNB may be determined based on DRX parameters provided in system information.
  • 38 is a flowchart illustrating an example of performing an idle mode DRX operation.
  • the terminal may receive idle mode DRX configuration information from the base station through higher layer signaling (eg, system information) (S21).
  • higher layer signaling eg, system information
  • the UE may determine a Paging Frame (PF) and a Paging Occasion (PO) to monitor the PDCCH in the paging DRX cycle based on the idle mode DRX configuration information (S22).
  • the DRX cycle may include on duration and sleep duration (or chance of DRX).
  • the UE may monitor the PDCCH in the PO of the determined PF (S23).
  • the UE monitors only one subframe (PO) per paging DRX cycle.
  • the UE receives a PDCCH scrambled by P-RNTI during on-duration (that is, when paging is detected)
  • the UE transitions to a connection mode and can transmit and receive data with the base station.
  • 39 is a schematic diagram of an example of an idle mode DRX operation.
  • paging for the terminal occurs.
  • the UE may monitor the PDCCH by waking up periodically (ie, every (paging) DRX cycle). If there is no paging, the terminal transitions to the connected state, receives data, and if data does not exist, may enter the sleep mode again.
  • C-DRX means DRX applied in an RRC connected state.
  • the DRX cycle of C-DRX may consist of a short DRX cycle and / or a long DRX cycle.
  • a short DRX cycle may be an option.
  • the UE may perform PDCCH monitoring for on duration. If the PDCCH is successfully detected during PDCCH monitoring, the UE may operate (or run) an inactive timer and maintain an awake state. Conversely, if the PDCCH is not successfully detected during the PDCCH monitoring, the UE may enter a sleep state after the on duration is over.
  • a PDCCH reception opportunity (eg, a slot having a PDCCH search space) may be set discontinuously based on the C-DRX setting.
  • a PDCCH reception opportunity (eg, a slot having a PDCCH search space) may be continuously set in the present disclosure.
  • PDCCH monitoring may be limited to a time interval set as a measurement gap regardless of C-DRX setting.
  • 40 is a flowchart showing an example of a method for performing a C-DRX operation.
  • the UE may receive RRC signaling (eg, MAC-MainConfig IE) including DRX configuration information from the base station (S31).
  • RRC signaling eg, MAC-MainConfig IE
  • S31 DRX configuration information
  • the DRX configuration information may include the following information.
  • -onDurationTimer Number of PDCCH subframes that can be continuously monitored at the beginning of the DRX cycle
  • -drx-InactivityTimer The number of PDCCH subframes that can be continuously monitored when the UE decodes the PDCCH having scheduling information
  • -drx-RetransmissionTimer The number of PDCCH subframes to be continuously monitored when HARQ retransmission is expected
  • the UE monitors the PDCCH for the ON duration of the DRX cycle based on the DRX setting (S33).
  • the UE may execute a DRX inactive timer and an RRC inactive timer.
  • scheduling information eg, DL Grant
  • RRC_CONNECTED state hereinafter, referred to as a connection state
  • the DRX mode may be started.
  • the UE wakes up from the DRX cycle and can monitor the PDCCH for a predetermined time (on a duration timer).
  • the terminal when a short DRX is set, when the UE starts the DRX mode, the UE first starts with a short DRX cycle, and the short DRX cycle ends, followed by a long DRX cycle.
  • the long DRX cycle may correspond to a multiple of the short DRX cycle.
  • the terminal may wake up more frequently. After the RRC inactive timer expires, the terminal may switch to the IDLE state and perform the IDLE mode DRX operation.
  • the terminal After the terminal is powered on, the terminal performs a boot up for application loading, an initial access / random access procedure for downlink and uplink synchronization with the base station, and a registration procedure with the network. Perform.
  • the current consumed during each procedure (or power consumption) is shown in FIG. 41.
  • the terminal When the transmission power of the terminal is high, current consumption of the terminal may increase. In addition, if there is no traffic to be transmitted to the terminal or traffic to the base station, the terminal transitions to the idle mode to reduce power consumption, and the terminal performs an idle mode DRX operation.
  • the UE may transition from the idle mode to the connected mode through a cell establishment procedure and transmit and receive data with the base station.
  • paging eg, a call is generated
  • the terminal may perform the connection mode DRX (C-DRX).
  • the terminal when the terminal is set to eDRX (Extended DRX) through higher layer signaling (eg, system information), the terminal may perform an eDRX operation in an idle mode or a connected mode.
  • eDRX Extended DRX
  • higher layer signaling eg, system information
  • the wireless device 43 shows another example of a wireless device applied to the present disclosure.
  • the wireless device may be implemented in various forms according to use-example / service.
  • the wireless devices 100 and 200 may be composed of various elements.
  • 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.
  • the transceiver (s) 114 can include one or more transceivers 106,206 and / or one or more antennas 108,208.
  • 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.
  • 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.
  • 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 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. 44, 100A), vehicles (FIGS. 44, 100B-1, 100B-2), XR devices (FIGS. 44, 100C), portable devices (FIGS. 44, 100D), and consumer electronics. (Fig. 44, 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 connected to each other through a wired interface, or at least some of them may be connected wirelessly 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 communication system 1 applied to the present disclosure 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.
  • the wireless communication / connections 150a, 150b, 150c can transmit / receive signals over various physical channels.
  • various signal processing processes eg, channel encoding / decoding, modulation / demodulation, resource mapping / demapping, etc.
  • resource allocation processes e.g., resource allocation processes, and the like.
  • 45 shows the AI device 100.
  • the AI device 100 is a TV, projector, mobile phone, smartphone, desktop computer, laptop, digital broadcasting terminal, PDA (personal digital assistants), PMP (portable multimedia player), navigation, tablet PC, wearable device, set-top box (STB) ), DMB receivers, radios, washing machines, refrigerators, desktop computers, digital signage, robots, vehicles, and the like.
  • PDA personal digital assistants
  • PMP portable multimedia player
  • STB set-top box
  • DMB receivers radios
  • washing machines refrigerators
  • desktop computers digital signage
  • robots, vehicles and the like.
  • the terminal 100 includes a communication unit 110, an input unit 120, a running processor 130, a sensing unit 140, an output unit 150, a memory 170, a processor 180, etc. It can contain.
  • the communication unit 110 may transmit and receive data to and from external devices such as other AI devices 100a to 100e or the AI server 200 using wired / wireless communication technology.
  • the communication unit 110 may transmit and receive sensor information, a user input, a learning model, a control signal, etc. with external devices.
  • the communication technology used by the communication unit 110 includes Global System for Mobile Communication (GSM), Code Division Multi Access (CDMA), Long Term Evolution (LTE), 5G, Wireless LAN (WLAN), Wireless-Fidelity (Wi-Fi) ), Bluetooth TM, Radio Frequency Identification (RFID), Infrared Data Association (IrDA), ZigBee, Near Field Communication (NFC), and the like.
  • GSM Global System for Mobile Communication
  • CDMA Code Division Multi Access
  • LTE Long Term Evolution
  • 5G Fifth Generation
  • WLAN Wireless LAN
  • Wi-Fi Wireless-Fidelity
  • Bluetooth TM Bluetooth TM
  • IrDA Infrared Data Association
  • ZigBee ZigBee
  • NFC Near Field Communication
  • the input unit 120 may acquire various types of data.
  • the input unit 120 may include a camera for inputting a video signal, a microphone for receiving an audio signal, a user input unit for receiving information from a user, and the like.
  • the camera or microphone is treated as a sensor, and the signal obtained from the camera or microphone may be referred to as sensing data or sensor information.
  • the input unit 120 may acquire training data for model training and input data to be used when obtaining an output using the training model.
  • the input unit 120 may obtain raw input data.
  • the processor 180 or the learning processor 130 may extract input features as pre-processing of the input data.
  • the learning processor 130 may train a model composed of artificial neural networks using the training data.
  • the trained artificial neural network may be referred to as a learning model.
  • the learning model can be used to infer a result value for new input data rather than learning data, and the inferred value can be used as a basis for determining to perform an action.
  • the learning processor 130 may perform AI processing together with the learning processor 240 of the AI server 200.
  • the learning processor 130 may include a memory integrated or implemented in the AI device 100.
  • the learning processor 130 may be implemented using memory 170, external memory directly coupled to the AI device 100, or memory maintained in the external device.
  • the sensing unit 140 may acquire at least one of AI device 100 internal information, AI device 100 environment information, and user information using various sensors.
  • the sensors included in the sensing unit 140 include a proximity sensor, an illuminance sensor, an acceleration sensor, a magnetic sensor, a gyro sensor, an inertial sensor, an RGB sensor, an IR sensor, a fingerprint recognition sensor, an ultrasonic sensor, an optical sensor, a microphone, and a lidar. , And radar.
  • the output unit 150 may generate output related to vision, hearing, or tactile sense.
  • the output unit 150 may include a display unit for outputting visual information, a speaker for outputting auditory information, a haptic module for outputting tactile information, and the like.
  • the memory 170 may store data supporting various functions of the AI device 100.
  • the memory 170 may store input data, learning data, learning models, learning history, etc. acquired by the input unit 120.
  • the processor 180 may determine at least one executable action of the AI device 100 based on information determined or generated using a data analysis algorithm or a machine learning algorithm. Also, the processor 180 may control components of the AI device 100 to perform a determined operation.
  • the processor 180 may request, search, receive, or utilize data of the learning processor 130 or the memory 170, and perform an operation that is predicted or determined to be preferable among the at least one executable operation. It is possible to control the components of the AI device 100 to execute.
  • the processor 180 may generate a control signal for controlling the corresponding external device, and transmit the generated control signal to the corresponding external device when it is necessary to link the external device to perform the determined operation.
  • the processor 180 may acquire intention information for a user input, and determine a user's requirement based on the obtained intention information.
  • the processor 180 uses at least one of a Speech To Text (STT) engine for converting voice input into a string or a Natural Language Processing (NLP) engine for obtaining intention information of a natural language, and a user Intention information corresponding to an input may be obtained.
  • STT Speech To Text
  • NLP Natural Language Processing
  • At this time, at least one of the STT engine or the NLP engine may be configured as an artificial neural network at least partially learned according to a machine learning algorithm. And, at least one or more of the STT engine or the NLP engine is learned by the learning processor 130, learned by the learning processor 240 of the AI server 200, or learned by distributed processing thereof May be
  • the processor 180 collects history information including the user's feedback on the operation content or operation of the AI device 100 and stores it in the memory 170 or the running processor 130, or the AI server 200, etc. Can be sent to external devices. The collected history information can be used to update the learning model.
  • the processor 180 may control at least some of the components of the AI device 100 to drive an application program stored in the memory 170. Furthermore, the processor 180 may operate by combining two or more of the components included in the AI device 100 with each other to drive the application program.
  • 46 shows an AI server 200 according to an embodiment of the present disclosure.
  • the AI server 200 may refer to an apparatus for learning an artificial neural network using a machine learning algorithm or using a trained artificial neural network.
  • the AI server 200 may be composed of a plurality of servers to perform distributed processing, or may be defined as a 5G network.
  • the AI server 200 is included as a configuration of a part of the AI device 100, and may perform at least a part of AI processing together.
  • the AI server 200 may include a communication unit 210, a memory 230, a running processor 240 and a processor 260.
  • the communication unit 210 may transmit and receive data with an external device such as the AI device 100.
  • the memory 230 may include a model storage unit 231.
  • the model storage unit 231 may store a model (or artificial neural network, 231a) being trained or trained through the learning processor 240.
  • the learning processor 240 may train the artificial neural network 231a using learning data.
  • the learning model may be used while being mounted on the AI server 200 of the artificial neural network, or may be mounted and used on an external device such as the AI device 100.
  • the learning model can be implemented in hardware, software, or a combination of hardware and software. When part or all of the learning model is implemented in software, one or more instructions constituting the learning model may be stored in the memory 230.
  • the processor 260 may infer the result value for the new input data using the learning model, and generate a response or control command based on the inferred result value.

Landscapes

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

Abstract

L'invention concerne un procédé destiné à régler la taille d'une fenêtre de contention pour l'accès d'un terminal à un canal dans une bande sans licence, ainsi qu'un appareil mettant en oeuvre ce procédé. Selon l'invention, le terminal peut transmettre des données par un procédé d'octroi défini, c'est-à-dire en tentant de transmettre des données à une station de base à partir de chacune des ressources prédéfinies par un processus LBT. Le terminal peut tenter de détecter une rétroaction relative aux données transmises pendant une certaine durée et, lorsque la rétroaction n'est pas détectée pendant cette durée, il peut régler la taille de fenêtre de contention utilisée pour déterminer l'accès au canal de la bande sans licence. Dans ce cas, la durée donnée n'est pas fixe mais peut être déterminée par la station de base et définie indépendamment pour chaque terminal.
PCT/KR2019/012358 2018-09-21 2019-09-23 Procédé de réglage de taille de fenêtre de contention pour l'accès d'un terminal à un canal dans une bande sans licence, et appareil le mettant en oeuvre WO2020060370A1 (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
KR20180114468 2018-09-21
KR10-2018-0114468 2018-09-21
KR10-2019-0036196 2019-03-28
KR20190036196 2019-03-28
KR10-2019-0051836 2019-05-02
KR20190051836 2019-05-02

Publications (1)

Publication Number Publication Date
WO2020060370A1 true WO2020060370A1 (fr) 2020-03-26

Family

ID=69888601

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2019/012358 WO2020060370A1 (fr) 2018-09-21 2019-09-23 Procédé de réglage de taille de fenêtre de contention pour l'accès d'un terminal à un canal dans une bande sans licence, et appareil le mettant en oeuvre

Country Status (1)

Country Link
WO (1) WO2020060370A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022188079A1 (fr) * 2021-03-10 2022-09-15 Oppo广东移动通信有限公司 Procédé de communication sans fil et premier dispositif
WO2023102864A1 (fr) * 2021-12-09 2023-06-15 Nokia Shanghai Bell Co., Ltd. Ajustement de taille de fenêtre de contention pour une communication dans une bande sans licence
WO2024017048A1 (fr) * 2022-07-20 2024-01-25 维沃移动通信有限公司 Procédé d'ajustement de fenêtre de contention et terminal

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017047973A1 (fr) * 2015-09-17 2017-03-23 엘지전자 주식회사 Procédé et dispositif permettant d'effectuer un processus lbt sur de multiples porteuses dans un système d'accès sans fil prenant en charge une bande non autorisée
WO2017131476A1 (fr) * 2016-01-29 2017-08-03 엘지전자 주식회사 Procédé permettant de régler un paramètre lbt de liaison descendante, dans un système de communication sans fil prenant en charge une bande sans licence, et dispositif permettant de prendre en charge ce procédé

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017047973A1 (fr) * 2015-09-17 2017-03-23 엘지전자 주식회사 Procédé et dispositif permettant d'effectuer un processus lbt sur de multiples porteuses dans un système d'accès sans fil prenant en charge une bande non autorisée
WO2017131476A1 (fr) * 2016-01-29 2017-08-03 엘지전자 주식회사 Procédé permettant de régler un paramètre lbt de liaison descendante, dans un système de communication sans fil prenant en charge une bande sans licence, et dispositif permettant de prendre en charge ce procédé

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
HUAWEI ET AL.: "Coexistence and channel access for NR unlicensed band operations", R1-1808061. 3GPP TSG RAN WG1 MEETING #94, vol. RAN WG1, 10 August 2018 (2018-08-10), Gothenburg, Sweden, XP051515465 *
INTEL CORPORATION: "Enhancements to channel access mechanism for NR-unlicensed", R1-1808685. 3GPP TSG RAN WG1 MEETING#94, vol. RAN WG1, 11 August 2018 (2018-08-11), Gothenburg, Sweden, XP051516060 *
LG ELECTRONICS: "Channel access procedure for NR unlicensed operation", R1-1808507. 3GPPTSG RAN WG1 MEETING #94, vol. RAN WG1, 11 August 2018 (2018-08-11), XP051515885 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022188079A1 (fr) * 2021-03-10 2022-09-15 Oppo广东移动通信有限公司 Procédé de communication sans fil et premier dispositif
WO2023102864A1 (fr) * 2021-12-09 2023-06-15 Nokia Shanghai Bell Co., Ltd. Ajustement de taille de fenêtre de contention pour une communication dans une bande sans licence
WO2024017048A1 (fr) * 2022-07-20 2024-01-25 维沃移动通信有限公司 Procédé d'ajustement de fenêtre de contention et terminal

Similar Documents

Publication Publication Date Title
WO2020091565A1 (fr) Procédé de transmission de signal de liaison montante pour un terminal dans une bande sans licence, et appareil utilisant ledit procédé
WO2020184836A1 (fr) Procédé de transmission d'informations de faisceau par un équipement utilisateur dans un système de communication sans fil, et équipement d'utilisateur et station de base le prenant en charge
WO2020145784A1 (fr) Procédure d'accès à un canal par un appareil dans une bande sans licence
WO2020171405A1 (fr) Procédé de gestion de faisceau par ue dans un systѐme de communication sans fil, et ue et station de base le prenant en charge
WO2020060361A1 (fr) Procédé pour qu'un terminal accède à un canal dans une bande sans licence et dispositif utilisant ledit procédé
WO2020091566A1 (fr) Procédé par lequel un terminal transmet un signal dans une bande sans licence, et appareil utilisant le procédé
WO2021075704A1 (fr) Procédé de commande d'une partie de largeur de bande
WO2021206400A1 (fr) Procédé de réalisation d'une procédure d'accès à un canal et appareil associé
WO2021029724A1 (fr) Procédé permettant de surveiller un canal de commande de liaison descendante physique et dispositif faisant appel audit procédé
WO2021029729A1 (fr) Fonctionnement de réception discontinue dans un système de communication sans fil
WO2020060370A1 (fr) Procédé de réglage de taille de fenêtre de contention pour l'accès d'un terminal à un canal dans une bande sans licence, et appareil le mettant en oeuvre
WO2022154616A1 (fr) Procédé et dispositif d'obtention d'une valeur cbr sur la base d'une détection partielle dans la technologie nr v2x
WO2020145788A1 (fr) Performance de procédure d'accès à un canal par une station de base dans une bande sans licence
WO2022220615A1 (fr) Procédé et dispositif pour transmettre ou recevoir un canal physique de rétroaction de liaison latérale dans un système de communication sans fil
WO2022154405A1 (fr) Procédé de réalisation de procédure d'accès au canal et appareil associé
WO2022080736A1 (fr) Procédé de réalisation d'une procédure d'accès à un canal et appareil pour cela
WO2021206409A1 (fr) Procédé destiné à la réalisation d'une procédure d'accès à un canal et dispositif associé
WO2021029664A1 (fr) Configuration de signal d'activation
WO2020067804A1 (fr) Procédé par lequel un terminal signale une mesure dans un système de communication sans fil, et dispositif utilisant le procédé
WO2020091578A1 (fr) Procédé d'émission/réception de données dans un système de communication sans fil et dispositif associé
WO2023090938A1 (fr) Procédé de transmission et de réception de données de liaison latérale dans un système de communication sans fil, et appareil associé
WO2022030873A1 (fr) Procédé de détermination d'exécution éventuelle de procédure d'accès à un canal et dispositif associé
WO2022030864A1 (fr) Procédé d'exécution d'une procédure d'accès à un canal et appareil associé
WO2021162504A1 (fr) Procédé et dispositif de communication d'un nœud iab dans lequel une pluralité de synchronisations sont réglées
WO2020091569A1 (fr) Procédé pour communiquer avec une station de base au moyen d'un terminal dans une bande sans licence, et dispositif utilisant ledit procédé

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 19861369

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 19861369

Country of ref document: EP

Kind code of ref document: A1