WO2020204556A1 - Dispositif et procédé d'émission et de réception d'un signal sans fil dans un système de communication sans fil - Google Patents

Dispositif et procédé d'émission et de réception d'un signal sans fil dans un système de communication sans fil Download PDF

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Publication number
WO2020204556A1
WO2020204556A1 PCT/KR2020/004376 KR2020004376W WO2020204556A1 WO 2020204556 A1 WO2020204556 A1 WO 2020204556A1 KR 2020004376 W KR2020004376 W KR 2020004376W WO 2020204556 A1 WO2020204556 A1 WO 2020204556A1
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cap
counter value
backoff counter
data
transmission
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PCT/KR2020/004376
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English (en)
Korean (ko)
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김선욱
양석철
박창환
이현호
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엘지전자 주식회사
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA

Definitions

  • the present invention relates to a wireless communication system, and more particularly, to a method and apparatus for transmitting and receiving wireless signals.
  • a wireless communication system is a multiple access system capable of supporting communication with multiple users by sharing available system resources (bandwidth, transmission power, etc.).
  • multiple access systems include a code division multiple access (CDMA) system, a frequency division multiple access (FDMA) system, a time division multiple access (TDMA) system, an orthogonal frequency division multiple access (OFDMA) system, and a single carrier frequency (SC-FDMA) system. division multiple access) system.
  • CDMA code division multiple access
  • FDMA frequency division multiple access
  • TDMA time division multiple access
  • OFDMA orthogonal frequency division multiple access
  • SC-FDMA single carrier frequency division multiple access
  • An object of the present invention is to provide a method and apparatus for efficiently performing a wireless signal transmission/reception process.
  • a first channel access procedure (CAP) is performed. Step to do; Randomly selecting a second backoff counter value BC2 to perform a second CAP for transmission of the radio signal;
  • the second CAP is started before the end of the first CAP, performing the second CAP based on a third backoff counter value, wherein the third backoff counter value is (i) the second It is determined based on the number of idle slots K observed in the first CAP before initiation of the CAP, and (ii) BC2, wherein K is a positive integer.
  • a terminal used in a wireless communication system comprising: at least one processor; And at least one computer memory operably connected to the at least one processor and allowing the at least one processor to perform an operation when executed, the operation including: a first Based on a back-off counter value BC1, in order to perform a first channel access procedure (CAP) and perform a second CAP for transmission of the radio signal, a second back-off counter value BC2 It is selected at random, and when the second CAP is started before the end of the first CAP, it includes performing the second CAP based on a third backoff counter value, and the third backoff counter value is (i ) It is determined based on the number of idle slots K observed in the first CAP before the start of the second CAP, and (ii) BC2, where K is a positive integer.
  • BC1 back-off counter value
  • an apparatus for a terminal comprising: at least one processor; And at least one computer memory operatively connected to the at least one processor and allowing the at least one processor to perform an operation when executed, the operation comprising: a first Based on a back-off counter value BC1, in order to perform a first channel access procedure (CAP) and perform a second CAP for transmission of the radio signal, a second back-off counter value BC2 It is selected at random, and when the second CAP is started before the end of the first CAP, it includes performing the second CAP based on a third backoff counter value, and the third backoff counter value is (i ) It is determined based on the number of idle slots K observed in the first CAP before the start of the second CAP, and (ii) BC2, where K is a positive integer.
  • BC1 back-off counter value
  • a computer-readable storage medium comprising at least one computer program that, when executed, causes the at least one processor to perform an operation, the operation comprising: a first bag Based on the back-off counter value BC1, in order to perform a first channel access procedure (CAP) and perform a second CAP for transmission of the radio signal, a second back-off counter value BC2 is randomly assigned. If the second CAP is started before the end of the first CAP, the second CAP is performed based on a third backoff counter value, and the third backoff counter value is (i) It is determined based on the number of idle slots K observed in the first CAP before the start of the second CAP, and (ii) BC2, where K is a positive integer.
  • the second CAP may further include transmitting the radio signal.
  • the third backoff counter value is max(0, BC2-K), and max(a,b) may represent the maximum value of a and b.
  • the third backoff counter value is min(BC1-K, BC2), and min(a,b) may represent the minimum value of a and b.
  • the third backoff counter value is min(BC1-K, BC2-K), and min(a,b) may represent the minimum value of a and b.
  • radio signal transmission and reception can be efficiently performed in a wireless communication system.
  • 3GPP system which is an example of a wireless communication system, and a general signal transmission method using them.
  • FIG. 2 illustrates a structure of a radio frame.
  • 3 illustrates a resource grid of a slot.
  • FIG. 4 shows an example in which a physical channel is mapped in a slot.
  • FIG. 6 illustrates a physical uplink shared channel (PUSCH) transmission process.
  • PUSCH physical uplink shared channel
  • FIG. 7 illustrates a wireless communication system supporting an unlicensed band.
  • FIG. 8 illustrates a method of occupying a resource in an unlicensed band.
  • FIG 9 illustrates a channel access procedure based on backoff.
  • FIG. 10 illustrates a scenario for transmitting data of various priorities.
  • 11 to 14 illustrate a signal transmission process according to an example of the present invention.
  • 15 to 18 exemplify a communication system 1 and a wireless device applied to the present invention.
  • CDMA code division multiple access
  • FDMA frequency division multiple access
  • TDMA time division multiple access
  • OFDMA orthogonal frequency division multiple access
  • SC-FDMA single carrier frequency division multiple access
  • CDMA may be implemented with a radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA2000.
  • TDMA may be implemented with radio technologies such as Global System for Mobile communications (GSM)/General Packet Radio Service (GPRS)/Enhanced Data Rates for GSM Evolution (EDGE).
  • GSM Global System for Mobile communications
  • GPRS General Packet Radio Service
  • EDGE Enhanced Data Rates for GSM Evolution
  • OFDMA may be implemented with a wireless technology such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, and E-UTRA (Evolved UTRA).
  • UTRA is a part of Universal Mobile Telecommunications System (UMTS).
  • 3rd Generation Partnership Project (3GPP) long term evolution (LTE) is a part of Evolved UMTS (E-UMTS) using E-UTRA
  • LTE-A Advanced
  • 3GPP New Radio or New Radio Access Technology (NR) is an evolved version of 3GPP LTE/LTE-A.
  • NR New Radio or New RAT
  • 3GPP NR is mainly described, but the technical idea of the present invention is not limited thereto.
  • a terminal receives information from a base station through a downlink (DL), and the terminal transmits information to the base station through an uplink (UL).
  • the information transmitted and received by the base station and the terminal includes data and various control information, and various physical channels exist according to the type/use of information transmitted and received by them.
  • 1 is a diagram for explaining physical channels used in a 3GPP NR system and a general signal transmission method using them.
  • the terminal In a state in which the power is turned off, the terminal is powered on again or newly enters the cell and performs an initial cell search operation such as synchronizing with the base station in step S101.
  • the UE receives a Synchronization Signal Block (SSB) from the base station.
  • SSB includes a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS), and a Physical Broadcast Channel (PBCH).
  • PSS Primary Synchronization Signal
  • SSS Secondary Synchronization Signal
  • PBCH Physical Broadcast Channel
  • the terminal synchronizes with the base station based on the PSS/SSS and acquires information such as cell identity (cell identity).
  • the terminal may acquire intra-cell broadcast information based on the PBCH.
  • the UE may receive a downlink reference signal (DL RS) in the initial cell search step to check a downlink channel state.
  • DL RS downlink reference signal
  • the UE After completing the initial cell search, the UE receives a physical downlink control channel (PDCCH) and a physical downlink shared channel (PDSCH) according to the physical downlink control channel information in step S102 to be more specific.
  • PDCCH physical downlink control channel
  • PDSCH physical downlink shared channel
  • the terminal may perform a random access procedure such as steps S103 to S106 to complete access to the base station.
  • the UE transmits a preamble through a physical random access channel (PRACH) (S103), and a response message to the preamble through a physical downlink control channel and a corresponding physical downlink shared channel.
  • PRACH physical random access channel
  • Can receive S104
  • a contention resolution procedure such as transmission of an additional physical random access channel (S105) and reception of a physical downlink control channel and a corresponding physical downlink shared channel (S106) ) Can be performed.
  • the UE receives a physical downlink control channel/physical downlink shared channel (S107) and a physical uplink shared channel (PUSCH) as a general uplink/downlink signal transmission procedure.
  • Physical Uplink Control Channel (PUCCH) transmission (S108) may be performed.
  • Control information transmitted from the UE to the base station is collectively referred to as uplink control information (UCI).
  • UCI includes HARQ ACK/NACK (Hybrid Automatic Repeat and ReQuest Acknowledgement/Negative-ACK), SR (Scheduling Request), CSI (Channel State Information), and the like.
  • CSI includes Channel Quality Indicator (CQI), Precoding Matrix Indicator (PMI), Rank Indication (RI), and the like.
  • CQI Channel Quality Indicator
  • PMI Precoding Matrix Indicator
  • RI Rank Indication
  • UCI is generally transmitted through PUCCH, but may be transmitted through PUSCH when control information and traffic data are to be transmitted simultaneously. In addition, UCI may be aperiodically transmitted through the PUSCH at the request/instruction of the network.
  • each radio frame has a length of 10 ms and is divided into two 5 ms half-frames (HF). Each half-frame is divided into five 1ms subframes (Subframe, SF). The subframe is divided into one or more slots, and the number of slots in the subframe depends on Subcarrier Spacing (SCS).
  • SCS Subcarrier Spacing
  • Each slot includes 12 or 14 Orthogonal Frequency Division Multiplexing (OFDM) symbols according to a cyclic prefix (CP). When a normal CP is used, each slot includes 14 OFDM symbols. When an extended CP is used, each slot includes 12 OFDM symbols.
  • OFDM Orthogonal Frequency Division Multiplexing
  • Table 1 exemplifies that when a normal CP is used, the number of symbols per slot, the number of slots per frame, and the number of slots per subframe vary according to the SCS.
  • Table 2 exemplifies that when an extended CP is used, the number of symbols per slot, the number of slots per frame, and the number of slots per subframe vary according to the SCS.
  • the structure of the frame is only an example, and the number of subframes, the number of slots, and the number of symbols in the frame may be variously changed.
  • OFDM numerology eg, SCS
  • the (absolute time) section of the time resource eg, SF, slot or TTI
  • TU Time Unit
  • the symbol may include an OFDM symbol (or a CP-OFDM symbol), an SC-FDMA symbol (or a Discrete Fourier Transform-spread-OFDM, DFT-s-OFDM symbol).
  • NR supports multiple numerology (or subcarrier spacing (SCS)) to support various 5G services. For example, when the SCS is 15 kHz, it supports a wide area in traditional cellular bands, and when the SCS is 30 kHz/60 kHz, it is dense-urban, lower latency. And a wider carrier bandwidth (wider carrier bandwidth) is supported, and when the SCS is 60 kHz or higher, a bandwidth greater than 24.25 GHz is supported to overcome phase noise.
  • SCS subcarrier spacing
  • the NR frequency band is defined as a frequency range of two types (FR1, FR2).
  • FR1 and FR2 may be configured as shown in Table 3 below. Further, FR2 may mean a millimeter wave (mmW).
  • mmW millimeter wave
  • the 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 includes 12 symbols.
  • the carrier includes a plurality of subcarriers in the frequency domain.
  • RB Resource Block
  • BWP Bandwidth Part
  • PRB Physical RBs
  • the carrier may contain up to N (eg, 5) BWPs. Data communication is performed through the activated BWP, and only one BWP can be activated to one terminal.
  • Each element in the resource grid is referred to as a resource element (RE), and one complex symbol may be mapped.
  • RE resource element
  • a frame is characterized by a self-contained structure in which all of a DL control channel, DL or UL data, and a UL control channel can be included in one slot.
  • the first N symbols in the slot are used to transmit the DL control channel (eg, PDCCH) (hereinafter, the DL control region), and the last M symbols in the slot are used to transmit the UL control channel (eg, PUCCH).
  • the DL control channel eg, PDCCH
  • the last M symbols in the slot are used to transmit the UL control channel (eg, PUCCH).
  • Can hereinafter, UL control region).
  • N and M are each an integer of 0 or more.
  • a resource region (hereinafter, a data region) between the DL control region and the UL control region may be used for DL data (eg, PDSCH) transmission or UL data (eg, PUSCH) transmission.
  • the GP provides a time gap when the base station and the terminal switch from a transmission mode to a reception mode or a process from a reception mode to a transmission mode. Some symbols at a time point at which the DL to UL is switched in the subframe may be set as GP.
  • PDCCH carries Downlink Control Information (DCI).
  • DCI Downlink Control Information
  • DL-SCH downlink shared channel
  • UL-SCH uplink shared channel
  • PCH paging information for a paging channel
  • It carries system information on the DL-SCH, resource allocation information for an upper layer control message such as a random access response transmitted on the PDSCH, a transmission power control command, and activation/release of Configured Scheduling (CS).
  • DL-SCH downlink shared channel
  • UL-SCH uplink shared channel
  • PCH paging information for a paging channel
  • CS Configured Scheduling
  • DCI includes a cyclic redundancy check (CRC), and the CRC is masked/scrambled with various identifiers (eg, Radio Network Temporary Identifier, RNTI) according to the owner or usage of the PDCCH.
  • RNTI Radio Network Temporary Identifier
  • the CRC is masked/scrambled with various identifiers (eg, Radio Network Temporary Identifier, RNTI) according to the owner or usage of the PDCCH.
  • RNTI Radio Network Temporary Identifier
  • UCI Uplink Control Information
  • UCI includes:
  • -SR (Scheduling Request): This is information used to request UL-SCH resources.
  • HARQ-ACK Hybrid Automatic Repeat Request-ACK (Acknowledgement): This is a response to a downlink data packet (eg, codeword) on the PDSCH. Indicates whether a downlink data packet has been successfully received.
  • HARQ-ACK 1 bit may be transmitted in response to a single codeword, and HARQ-ACK 2 bits may be transmitted in response to two codewords.
  • the HARQ-ACK response includes positive ACK (simply, ACK), negative ACK (NACK), DTX or NACK/DTX.
  • HARQ-ACK is mixed with HARQ ACK/NACK and ACK/NACK.
  • MIMO Multiple Input Multiple Output
  • PMI Precoding Matrix Indicator
  • Table 4 illustrates PUCCH formats. Depending on the PUCCH transmission length, it can be classified into Short PUCCH (formats 0, 2) and Long PUCCH (formats 1, 3, 4).
  • the UE may detect a PDCCH in slot #n.
  • the PDCCH includes downlink scheduling information (eg, DCI formats 1_0, 1_1), and the PDCCH represents a DL assignment-to-PDSCH offset (K0) and a PDSCH-HARQ-ACK reporting offset (K1).
  • DCI formats 1_0 and 1_1 may include the following information.
  • -Frequency domain resource assignment indicates the RB set assigned to the PDSCH
  • K0 indicating the starting position (eg, OFDM symbol index) and length (eg number of OFDM symbols) of the PDSCH in the slot
  • -HARQ process number (4 bits): indicates the HARQ process ID (Identity) for data (e.g., PDSCH, TB (Transport Block))
  • -PUCCH resource indicator indicates a PUCCH resource to be used for UCI transmission among a plurality of PUCCH resources in a PUCCH resource set
  • the UE may transmit UCI through PUCCH in slot #(n+K1).
  • the UCI includes a HARQ-ACK response for the PDSCH.
  • the HARQ-ACK response may be configured with 1-bit.
  • the HARQ-ACK response may consist of 2-bits when spatial bundling is not configured, and may consist of 1-bits when spatial bundling is configured.
  • the HARQ-ACK transmission time point for a plurality of PDSCHs is designated as slot #(n+K1)
  • the UCI transmitted in slot #(n+K1) includes HARQ-ACK responses for the plurality of PDSCHs.
  • the UE may detect the PDCCH in slot #n.
  • the PDCCH includes uplink scheduling information (eg, DCI formats 0_0, 0_1).
  • DCI formats 0_0 and 0_1 may include the following information.
  • -Frequency domain resource assignment indicates the RB set assigned to the PUSCH
  • -Time domain resource assignment indicates the slot offset K2, the starting position (eg, symbol index) and length (eg number of OFDM symbols) of the PUSCH in the slot.
  • the start symbol and length may be indicated through a Start and Length Indicator Value (SLIV) or may be indicated respectively.
  • SIV Start and Length Indicator Value
  • the UE may transmit the PUSCH in slot # (n+K2) according to the scheduling information of slot #n.
  • the PUSCH includes the UL-SCH TB.
  • the UCI may be transmitted through the PUSCH (PUSCH piggyback).
  • a cell operating in a licensed band (hereinafter, L-band) is defined as an LCell, and a carrier of the LCell is defined as a (DL/UL) Licensed Component Carrier (LCC).
  • L-band a cell operating in an unlicensed band
  • U-band a cell operating in an unlicensed band
  • UCC unlicensed Component Carrier
  • the carrier of the cell may mean the operating frequency (eg, center frequency) of the cell.
  • Cell/carrier eg, Component Carrier, CC
  • Cell/carrier may be collectively referred to as a cell.
  • one terminal can transmit and receive signals with the base station through a plurality of merged cells/carriers.
  • one CC may be set as a Primary CC (PCC), and the remaining CC may be set as a Secondary CC (SCC).
  • Specific control information/channel eg, CSS PDCCH, PUCCH
  • PCC/SCC 7(a) illustrates a case where a terminal and a base station transmit and receive signals through LCC and UCC (non-standalone (NSA) mode).
  • LCC may be set to PCC and UCC may be set to SCC.
  • one specific LCC may be set as PCC and the remaining LCCs may be set as SCC.
  • 7(a) corresponds to the LAA of the 3GPP LTE system.
  • 7(b) illustrates a case in which a terminal and a base station transmit and receive signals through one or more UCCs without an LCC (SA mode). in this case.
  • One of the UCCs may be set as PCC and the other UCC may be set as SCC. Both the NSA mode and the SA mode may be supported in the unlicensed band of the 3GPP NR system.
  • CS Carrier Sensing
  • the communication node may first perform CS (Carrier Sensing) before signal transmission to check whether other communication node(s) transmit signals.
  • CS Carrier Sensing
  • a case where it is determined that other communication node(s) does not transmit a signal is defined as having a clear channel assessment (CCA). If there is a CCA threshold set by pre-defined or higher layer (e.g., RRC) signaling, the communication node determines the channel state as busy if energy higher than the CCA threshold is detected in the channel, otherwise the channel state Can be judged as children.
  • the CCA threshold is specified as -62dBm for non-Wi-Fi signals and -82dBm for Wi-Fi signals.
  • the communication node can start signal transmission in the UCell.
  • the series of processes described above may be referred to as Listen-Before-Talk (LBT) or Channel Access Procedure (CAP). LBT and CAP can be used interchangeably.
  • FBE Frame Based Equipment
  • LBE Load Based Equipment
  • FBE is a channel occupancy time (e.g., 1-10ms), which means the time that the communication node can continue to transmit when the channel connection is successful, and an idle period corresponding to at least 5% of the channel occupancy time.
  • (idle period) constitutes one fixed frame
  • CCA is defined as an operation of observing a channel during a CCA slot (at least 20 ⁇ s) at the end of the idle period.
  • the communication node periodically performs CCA in a fixed frame unit, and if the channel is in an unoccupied state, it transmits data during the channel occupancy time, and if the channel is occupied, it suspends transmission and Wait for the CCA slot.
  • the communication node first q ⁇ 4, 5,... , After setting the value of 32 ⁇ , perform CCA for 1 CCA slot. If the channel is not occupied in the first CCA slot, data can be transmitted by securing a maximum (13/32)q ms length of time. If the channel is occupied in the first CCA slot, the communication node randomly N ⁇ 1, 2,... Select the value of, q ⁇ and store it as the initial value of the counter. Afterwards, the channel state is sensed in units of CCA slots, and if the channel is not occupied in units of CCA slots, the value stored in the counter is decreased by one. When the counter value becomes 0, the communication node can transmit data by securing a maximum (13/32)q ms length of time.
  • a communication device eg, a base station, a terminal
  • the communication device may arbitrarily select the backoff counter N within the contention window CW according to step 1.
  • the N value is set to the initial value N init (S1220).
  • N init is selected as a random value from 0 to CW p .
  • Step 4 if the backoff counter value N is 0 (S1230; Y), the communication device ends the CAP process (S1232).
  • the communication device may perform Tx burst (eg, PDSCH, PUSCH) transmission (S1234).
  • the communication device decreases the backoff counter value by 1 according to step 2 (S1240).
  • the communication device checks whether the channel of the U-cell(s) is in an idle state (S1250), and if the channel is in an idle state (S1250; Y), it checks whether the backoff counter value is 0 (S1230).
  • step S1250 if the channel is not in an idle state in step S1250, that is, if the channel is in a busy state (S1250; N), the communication device has a delay period longer than the slot time (eg, 9usec) according to step 5 (defer duration T d ; 25usec or more) ), it is possible to check whether the corresponding channel is in an idle state (S1260). If the channel is in the idle state in the delay period (S1270; Y), the communication device may resume the CAP process again.
  • the delay period may consist of a 16 usec period and m p consecutive slot times (eg, 9 usec) immediately following.
  • the communication device performs step S1260 again to check whether the channel of the U-cell(s) is in the idle state during the new delay period.
  • Table 5 illustrates that m p applied to the CAP, minimum CW, maximum CW, maximum channel occupancy time (MCOT) and allowed CW sizes vary according to the channel access priority class. .
  • Table 5 shows parameters for DL transmission in existing LTE. Parameters for UL transmission may be similarly defined.
  • Various data having different priorities may be transmitted in an unlicensed band.
  • QoS Quality of Service
  • Various data having different priorities may be transmitted in an unlicensed band.
  • data transmission/reception having higher priority or higher QoS level, stricter latency/reliability request, and smaller channel access priority class value
  • Data2 may be scheduled prior to the time of Data1 transmission/reception.
  • a channel access procedure in case of transmitting various data in an unlicensed band is proposed.
  • Various data may correspond to different services and may have different priorities accordingly.
  • the transmitting device e.g., terminal, base station
  • the unlicensed band Through this, data having a relatively high priority can be transmitted to the receiving device more quickly and efficiently.
  • the present specification is not limited thereto, but the present specification proposes a channel access procedure for Data1 and Data2 in the situation of FIG. 10.
  • the data may be uplink data or downlink data.
  • the proposal of the present specification is not limited to transmission and reception of data or data channels, and may be equally applied to other channels/signals (eg, control information/channels, reference signals).
  • Data1 may correspond to PUSCH and Data2 may correspond to PUCCH.
  • Data1 may correspond to PUSCH
  • Data2 may correspond to SRS.
  • DCI Data1 the DCI scheduling Data1
  • the UE After receiving the DCI scheduling Data1 (hereinafter, DCI Data1 ), the UE completes decoding for DCI Data1 until a time point T3, and may start a CAP for Data1 transmission through an unlicensed band.
  • the terminal may receive a new DCI (hereinafter, DCI Data2 ) instructed to perform a CAP corresponding to a smaller priority class from the time T6 for data transmission at a time earlier than Data1 (hereinafter, Data2).
  • DCI may be received through PDCCH
  • Data eg, TB
  • Data eg, UCI
  • the signal transmission and reception of FIG. 11 may be all included in one slot, or may be configured to be included over a plurality of slots.
  • transmitting and receiving a specific signal may include transmitting and receiving the specific signal through an unlicensed band.
  • Method #1 During the execution of the first CAP (CAP for data 1 in FIG. 11; T3 to T6) for the first time transmission (T9 in FIG. 11), the second time transmission earlier than the first time point (T7 in FIG. 11) Method for performing a second CAP (CAP for data 2 of FIG. 11) for
  • the X value may be set in advance or may be signaled by DCI scheduling Data1.
  • the terminal may observe a total of K idle slots before the start of performing the second CAP. That is, the backoff counter value may be BC1-K at time T6 of FIG. 11.
  • the Y value may be set in advance or may be signaled by DCI scheduling Data2.
  • the BC2 value at the start point of performing the second CAP (eg, T6) may be replaced with one of the following values.
  • the energy detection threshold applied to the CAP for Data2 transmission may be higher than the energy detection threshold applied to the CAP for Data1 transmission.
  • each threshold and/or an offset value between thresholds may be defined in advance or may be set by L1 signaling (eg, PDCCH) or higher layer (eg, RRC) signaling.
  • the X value may be set in advance or may be signaled by DCI scheduling Data1.
  • the terminal may observe a total of K1 idle slots before the start of performing the second CAP. That is, the backoff counter value may be BC1-K1 at time T6 of FIG. 11.
  • the first CAP may be performed from time T8 of FIG. 11 (hereinafter, CASE #1).
  • the second CAP for Data2 transmission is not successful (until the time of Data2 transmission indicated by the base station), the Data2 transmission is dropped and the first CAP may be performed from the time T7 of FIG. 11 (hereinafter, CASE# 2). Meanwhile, the number of idle slots observed in the second CAP process is defined as K2. At this time, if the backoff counter value when the first CAP held in CASE#1 or CASE#2 is resumed is defined as BC1', BC1' may be set to one of the following values.
  • BC1' max(0, BC1-K1-K2). That is, all idle slots observed in the first CAP process and the second CAP process before the hold may be reflected.
  • BC1' max(0, BC1-K1) or BC1-K1. That is, the idle slot observed in the first CAP process before the hold may be reflected. It may be appropriate when the number of idle slots observed in the first CAP process prior to holding is not utilized for the second CAP.
  • BC1' BC1. That is, a new first CAP may be started. Like Option 1 or Option 3 of [Method #1], it may be appropriate when the number of idle slots observed in the first CAP process prior to holding is utilized for the second CAP.
  • BC1' A backoff counter value less than or equal to CWS1', which is one of the values of the CWS set corresponding to the priority class X at the time point, may be randomly selected.
  • CAP channel access procedure
  • Method #1A Second data transmission due to generation of second data having a higher priority than first data while performing a first CAP (CAP for data 1 in FIG. 12; T1 to T2) for first data transmission Method for performing a second CAP (CAP for data 2 of FIG. 12) for
  • the X value may be determined by a traffic type of Data1 and a predetermined rule.
  • the base station may observe a total of K idle slots before the start of performing the second CAP. That is, the backoff counter value may be BC1-K at time T2 of FIG. 12.
  • the Y value may be determined by a traffic type of Data2 and a predetermined rule.
  • the BC2 value at the start point of performing the second CAP (eg, T2) may be replaced with one of the following values.
  • the energy detection threshold applied to the CAP for Data2 transmission may be higher than the energy detection threshold applied to the CAP for Data1 transmission.
  • each threshold value and/or an offset value between threshold values may be defined in advance.
  • Method #2A The execution of the first CAP (CAP for data 1 in FIG. 12; T1 to T2) for the first data transmission was held due to the occurrence of second data having a higher priority than the first data.
  • the X value may be determined by a traffic type of Data1 and a predetermined rule.
  • the X value may be signaled to the UE through DCI.
  • the base station may observe a total of K1 idle slots before the start of performing the second CAP. That is, the backoff counter value may be BC1-K1 at time T2 of FIG. 12.
  • the first CAP may be performed from time T4 of FIG. 12.
  • the number of idle slots observed in the second CAP process is defined as K2.
  • BC1' BC1' may be set to one of the following values.
  • BC1' max(0, BC1-K1-K2). That is, all idle slots observed in the first CAP process and the second CAP process before the hold may be reflected.
  • BC1' max(0, BC1-K1) or BC1-K1. That is, the idle slot observed in the first CAP process before the hold may be reflected. It may be appropriate when the number of idle slots observed in the first CAP process prior to holding is not utilized for the second CAP.
  • BC1' BC1. That is, a new first CAP may be started. Like Option 1 or Option 3 of [Method #1A], it may be appropriate when the number of idle slots observed in the first CAP process prior to holding is utilized for the second CAP.
  • BC1' A backoff counter value less than or equal to CWS1', which is one of the values of the CWS set corresponding to the priority class X at the time point, may be randomly selected.
  • the communication device may perform a first CAP based on the first backoff counter value BC1 (S1302). Thereafter, the communication device may randomly select the second backoff counter value BC2 in order to perform the second CAP for transmission of the radio signal (S1304). Meanwhile, when the second CAP is started before the end of the first CAP, the communication device may perform the second CAP based on the third backoff counter value (S1306). Thereafter, when the second CAP is successful, the communication device may transmit a radio signal.
  • the third backoff counter value may be determined based on (i) the number of idle slots K observed in the first CAP before the start of the second CAP, and (ii) BC2.
  • K is an integer greater than or equal to 0, and preferably may be a positive integer.
  • the third backoff counter value may be given as follows.
  • 14 illustrates a signal transmission process according to an example of the present invention. 14 illustrates a signal transmission process according to methods 1 to 2, and corresponds to the process of FIG. 11.
  • the base station may transmit a DCI for scheduling first UL data to a terminal (S1402).
  • DCI can be received over a licensed band or an unlicensed band.
  • the terminal may perform the first CAP to transmit the first UL data (S1404a).
  • the base station may additionally transmit a DCI for scheduling the second UL data to the terminal (S1406).
  • DCI can be received over a licensed band or an unlicensed band.
  • the second UL data may have a higher priority than the first UL data (eg, the QoS level is higher, the latency/reliability request is more stringent, the channel access priority class value is lower).
  • the UE in order to first transmit the second UL data, the UE suspends the first CAP performance if the first CAP for transmitting the first UL data is before the end, and performs a second CAP for transmitting the second UL data. Can start (S1408). If the priority of the second UL data is lower than that of the first UL data, the second CAP may be initiated/performed after the first CAP is terminated and the first UL data is transmitted. If the second CAP is successful, after transmitting the second UL data (via the unlicensed band) (S1410), the UE may resume the first CAP to transmit the first UL data (S1404b). Thereafter, if the first CAP is successful, the terminal may transmit the first UL data (via an unlicensed band) (S1412).
  • FIG. 14 illustrates a process in which a terminal transmits UL data to a base station on an unlicensed band.
  • a terminal transmits UL data to a base station on an unlicensed band.
  • a communication system 1 applied to the present invention includes a wireless device, a base station, and a network.
  • the wireless device refers to a device that performs communication using a wireless access technology (eg, 5G NR (New RAT), LTE (Long Term Evolution)), and may be referred to as a communication/wireless/5G device.
  • wireless devices include robots 100a, vehicles 100b-1 and 100b-2, eXtended Reality (XR) devices 100c, hand-held devices 100d, and home appliances 100e. ), an Internet of Thing (IoT) device 100f, and an AI device/server 400.
  • the vehicle may include a vehicle equipped with a wireless communication function, an autonomous vehicle, and a vehicle capable of performing inter-vehicle communication.
  • the vehicle may include an Unmanned Aerial Vehicle (UAV) (eg, a drone).
  • UAV Unmanned Aerial Vehicle
  • XR devices include AR (Augmented Reality) / VR (Virtual Reality) / MR (Mixed Reality) devices, including HMD (Head-Mounted Device), HUD (Head-Up Display), TV, smartphone, It can be implemented in the form of a computer, wearable device, home appliance, digital signage, vehicle, robot, and the like.
  • Portable devices may include smart phones, smart pads, wearable devices (eg, smart watches, smart glasses), computers (eg, notebook computers, etc.).
  • Home appliances may include TVs, refrigerators, and washing machines.
  • IoT devices may include sensors, smart meters, and the like.
  • the base station and the network may be implemented as a wireless device, and the specific wireless device 200a may operate as a base station/network node to another wireless device.
  • 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 perform direct communication (e.g. sidelink communication) without going through the base station / network.
  • the vehicles 100b-1 and 100b-2 may perform direct communication (e.g.
  • V2V Vehicle to Vehicle
  • V2X Vehicle to Everything
  • 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 established between the wireless devices 100a to 100f / base station 200 and the base station 200 / base station 200.
  • the wireless communication/connection includes various wireless access such as uplink/downlink communication 150a, sidelink communication 150b (or D2D communication), base station communication 150c (eg relay, Integrated Access Backhaul). This can be achieved through technology (eg 5G NR)
  • wireless communication/connections 150a, 150b, 150c the wireless device and the base station/wireless device, and the base station and the base station can transmit/receive radio signals to each other.
  • the wireless communication/connection 150a, 150b, 150c can transmit/receive signals through various physical channels.
  • FIG. 16 illustrates a wireless device applicable to the present invention.
  • the first wireless device 100 and the second wireless device 200 may transmit and receive wireless signals through various wireless access technologies (eg, LTE and NR).
  • ⁇ the first wireless device 100, the second wireless device 200 ⁇ is the ⁇ wireless device 100x, the base station 200 ⁇ and/or ⁇ wireless device 100x, wireless device 100x) of FIG. 15 ⁇ Can be matched.
  • the first wireless device 100 includes one or more processors 102 and one or more memories 104, and may further include one or more transceivers 106 and/or one or more antennas 108.
  • the processor 102 controls the memory 104 and/or the transceiver 106 and may be configured to implement the descriptions, functions, procedures, suggestions, methods, and/or operational flowcharts disclosed herein.
  • the processor 102 may process information in the memory 104 to generate first information/signal, and then transmit a radio signal including the first information/signal through the transceiver 106.
  • the processor 102 may store information obtained from signal processing of the second information/signal in the memory 104 after receiving a radio signal including the second information/signal through the transceiver 106.
  • 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 may perform some or all of the processes controlled by the processor 102, or instructions for performing the descriptions, functions, procedures, suggestions, methods, and/or operational flow charts disclosed in this document. It can store software code including
  • 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 may be coupled with the processor 102 and may transmit and/or receive radio signals through one or more antennas 108.
  • the transceiver 106 may include a transmitter and/or a receiver.
  • the transceiver 106 may be mixed with an RF (Radio Frequency) unit.
  • the wireless device may mean a communication modem/circuit/chip.
  • the second wireless device 200 includes one or more processors 202 and one or more memories 204, and may further include one or more transceivers 206 and/or one or more antennas 208.
  • the processor 202 controls the memory 204 and/or the transceiver 206 and may be configured to implement the descriptions, functions, procedures, suggestions, methods, and/or operational flowcharts disclosed herein.
  • the processor 202 may process 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 store information obtained from signal processing of the fourth information/signal in the memory 204 after receiving a radio signal including the fourth information/signal through the transceiver 206.
  • 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 may perform some or all of the processes controlled by the processor 202, or instructions for performing the descriptions, functions, procedures, suggestions, methods and/or operational flow charts disclosed in this document. It can store software code including
  • 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 may be connected to the processor 202 and may transmit and/or receive radio signals through one or more antennas 208.
  • the transceiver 206 may include a transmitter and/or a receiver.
  • the transceiver 206 may be used interchangeably 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, 202.
  • one or more processors 102, 202 may implement one or more layers (eg, functional layers such as PHY, MAC, RLC, PDCP, RRC, SDAP).
  • One or more processors 102, 202 may be configured to generate one or more Protocol Data Units (PDUs) and/or one or more Service Data Units (SDUs) according to the description, functions, procedures, proposals, methods, and/or operational flow charts disclosed in this document. Can be generated.
  • PDUs Protocol Data Units
  • SDUs Service Data Units
  • One or more processors 102, 202 may generate messages, control information, data, or information according to the description, function, procedure, suggestion, method, and/or operational flow chart disclosed herein.
  • At least one processor (102, 202) generates a signal (e.g., a baseband signal) including PDU, SDU, message, control information, data or information according to the functions, procedures, proposals and/or methods disclosed herein. , It may be provided to one or more transceivers (106, 206).
  • One or more processors 102, 202 may receive signals (e.g., baseband signals) from one or more transceivers 106, 206, and the descriptions, functions, procedures, proposals, methods, and/or operational flowcharts disclosed herein PDUs, SDUs, messages, control information, data, or information may be obtained according to the parameters.
  • signals e.g., baseband signals
  • One or more of the processors 102 and 202 may be referred to as a controller, microcontroller, microprocessor, or microcomputer.
  • One or more of the processors 102 and 202 may be implemented by hardware, firmware, software, or a combination thereof.
  • ASICs Application Specific Integrated Circuits
  • DSPs Digital Signal Processors
  • DSPDs Digital Signal Processing Devices
  • PLDs Programmable Logic Devices
  • FPGAs Field Programmable Gate Arrays
  • the description, functions, procedures, suggestions, methods, and/or operational flow charts 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 description, functions, procedures, proposals, methods and/or operational flow charts disclosed in this document are included in one or more processors 102, 202, or stored in one or more memories 104, 204, and are It may be driven by the above processors 102 and 202.
  • the descriptions, functions, procedures, proposals, methods and/or operational flowcharts disclosed in this document may be implemented using firmware or software in the form of codes, instructions and/or a set of instructions.
  • One or more memories 104 and 204 may be connected to one or more processors 102 and 202 and may store various types of data, signals, messages, information, programs, codes, instructions and/or instructions.
  • One or more memories 104 and 204 may be composed of ROM, RAM, EPROM, flash memory, hard drive, register, cache memory, computer readable storage medium, and/or combinations thereof.
  • One or more memories 104 and 204 may be located inside and/or outside of one or more processors 102 and 202.
  • one or more memories 104, 204 may be connected to one or more processors 102, 202 through various technologies such as wired or wireless connection.
  • the one or more transceivers 106 and 206 may transmit user data, control information, radio signals/channels, and the like mentioned in the methods and/or operation flow charts of this document to one or more other devices.
  • One or more transceivers (106, 206) may receive user data, control information, radio signals/channels, etc. mentioned in the description, functions, procedures, suggestions, methods and/or operation flow charts disclosed in this document from one or more other devices.
  • one or more transceivers 106 and 206 may be connected to one or more processors 102 and 202, and may transmit and receive wireless signals.
  • one or more processors 102, 202 may control one or more transceivers 106, 206 to transmit user data, control information, or radio signals to one or more other devices.
  • one or more processors 102, 202 may control one or more transceivers 106, 206 to receive user data, control information, or radio signals from one or more other devices.
  • one or more transceivers (106, 206) may be connected with one or more antennas (108, 208), and one or more transceivers (106, 206) through one or more antennas (108, 208), the description and functionality disclosed in this document. It may be set to transmit and receive user data, control information, radio signals/channels, and the like mentioned in a procedure, a proposal, a method and/or an operation flowchart.
  • one or more antennas may be a plurality of physical antennas or a plurality of logical antennas (eg, antenna ports).
  • One or more transceivers (106, 206) in order to process the received user data, control information, radio signal / channel, etc. using one or more processors (102, 202), the received radio signal / channel, etc. in the RF band signal. It can be converted into a baseband signal.
  • One or more transceivers 106 and 206 may convert user data, control information, radio signals/channels, etc. processed using one or more processors 102 and 202 from a baseband signal to an RF band signal.
  • one or more of the transceivers 106 and 206 may include (analog) oscillators and/or filters.
  • At least one memory may store instructions or programs, and the instructions or programs are at least operably connected to the at least one memory when executed. It may cause one processor to perform operations according to some embodiments or implementations of the present specification.
  • a computer-readable storage medium may store at least one instruction or a computer program, and the at least one instruction or computer program is executed by at least one processor. It may cause one processor to perform operations according to some embodiments or implementations of the present specification.
  • a processing device or apparatus may include at least one processor and at least one computer memory that is connectable to the at least one processor.
  • the at least one computer memory may store instructions or programs, and the instructions or programs, when executed, cause at least one processor to be operably connected to the at least one memory. It may be possible to perform operations according to embodiments or implementations.
  • FIG. 17 shows another example of a wireless device applied to the present invention.
  • the wireless device may be implemented in various forms according to use-example/service (see FIG. 15).
  • the wireless devices 100 and 200 correspond to the wireless devices 100 and 200 of FIG. 16, and various elements, components, units/units, and/or modules ) Can be composed of.
  • the wireless devices 100 and 200 may include a communication unit 110, a control unit 120, a memory unit 130, and an additional element 140.
  • the communication unit may include a communication circuit 112 and a transceiver(s) 114.
  • the communication circuit 112 may include one or more processors 102 and 202 and/or one or more memories 104 and 204 of FIG. 16.
  • the transceiver(s) 114 may include one or more transceivers 106,206 and/or one or more antennas 108,208 of FIG. 16.
  • the control unit 120 is electrically connected to the communication unit 110, the memory unit 130, and the additional element 140 and controls all 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 the information stored in the memory unit 130 to an external (eg, other communication device) through the communication unit 110 through a wireless/wired interface, or through the communication unit 110 to the outside (eg, 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 I/O unit, a driving unit, and a computing unit.
  • wireless devices include robots (FIGS. 15, 100a), vehicles (FIGS. 15, 100b-1, 100b-2), XR devices (FIGS. 15, 100c), portable devices (FIGS. 15, 100d), and home appliances.
  • the wireless device can be used in a mobile or fixed location depending on the use-example/service.
  • various elements, components, units/units, and/or modules in the wireless devices 100 and 200 may be connected to each other through a wired interface, or at least part of them may be wirelessly connected through the communication unit 110.
  • the control unit 120 and the communication unit 110 are connected by wire, and the control unit 120 and the first unit (eg, 130, 140) are connected through the communication unit 110.
  • the control unit 120 and the first unit eg, 130, 140
  • each element, component, unit/unit, and/or module in the wireless device 100 and 200 may further include one or more elements.
  • the controller 120 may be configured with one or more processor sets.
  • control unit 120 may be composed of a set of a communication control processor, an application processor, an electronic control unit (ECU), a graphic processing processor, and a 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. volatile memory) and/or a combination thereof.
  • the vehicle or autonomous vehicle may be implemented as a mobile robot, a vehicle, a train, an aerial vehicle (AV), or a ship.
  • AV aerial vehicle
  • the vehicle or autonomous vehicle 100 includes an antenna unit 108, a communication unit 110, a control unit 120, a driving unit 140a, a power supply unit 140b, a sensor unit 140c, and autonomous driving. It may include a unit (140d).
  • the antenna unit 108 may be configured as a part of the communication unit 110.
  • Blocks 110/130/140a to 140d correspond to blocks 110/130/140 of FIG. 17, respectively.
  • the communication unit 110 may transmit and receive signals (eg, data, control signals, etc.) with external devices such as other vehicles, base stations (e.g. base stations, roadside base stations, etc.), and servers.
  • the controller 120 may perform various operations by controlling elements of the vehicle or the autonomous vehicle 100.
  • the control unit 120 may include an Electronic Control Unit (ECU).
  • the driving unit 140a may cause the vehicle or the autonomous vehicle 100 to travel on the ground.
  • the driving unit 140a may include an engine, a motor, a power train, a wheel, a brake, a steering device, and the like.
  • the power supply unit 140b supplies power to the vehicle or the autonomous vehicle 100, and may include a wired/wireless charging circuit, a battery, and the like.
  • the sensor unit 140c may obtain vehicle status, surrounding environment information, user information, and the like.
  • the sensor unit 140c is an IMU (inertial measurement unit) sensor, a collision sensor, a wheel sensor, a speed sensor, an inclination sensor, a weight detection sensor, a heading sensor, a position module, and a vehicle advancement. /Reverse sensor, battery sensor, fuel sensor, tire sensor, steering sensor, temperature sensor, humidity sensor, ultrasonic sensor, illumination sensor, pedal position sensor, etc. may be included.
  • the autonomous driving unit 140d is a technology for maintaining a driving lane, a technology for automatically adjusting the speed such as adaptive cruise control, a technology for automatically driving along a predetermined route, and for driving by automatically setting a route when a destination is set. Technology, etc. can be implemented.
  • the communication unit 110 may receive map data and traffic information data from an external server.
  • the autonomous driving unit 140d may generate an autonomous driving route and a driving plan based on the acquired data.
  • the controller 120 may control the driving unit 140a so that the vehicle or the autonomous driving vehicle 100 moves along the autonomous driving path according to the driving plan (eg, speed/direction adjustment).
  • the communication unit 110 asynchronously/periodically acquires the latest traffic information data from an external server, and may acquire surrounding traffic information data from surrounding vehicles.
  • the sensor unit 140c may acquire vehicle state and surrounding environment information.
  • the autonomous driving unit 140d may update the autonomous driving route and the driving plan based on the newly acquired data/information.
  • the communication unit 110 may transmit information about a vehicle location, an autonomous driving route, and a driving plan to an external server.
  • the external server may predict traffic information data in advance using AI technology or the like based on information collected from the vehicle or autonomously driving vehicles, and may provide the predicted traffic information data to the vehicle or autonomously driving vehicles.
  • the present invention can be used in a terminal, a base station, or other equipment of a wireless mobile communication system.

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

Abstract

La présente invention concerne un système de communication sans fil et, plus précisément, un procédé et un dispositif associé, le procédé comprenant les étapes consistant : à réaliser un premier CAP sur la base d'une première contre-valeur de réduction de puissance (BC1) ; à sélectionner de façon aléatoire une deuxième contre-valeur de réduction de puissance (BC2) de manière à réaliser un second CAP destiné à l'émission d'un signal sans fil ; et à réaliser le second CAP sur la base d'une troisième contre-valeur de réduction de puissance lorsque le second CAP démarre avant la fin du premier CAP, la troisième contre-valeur de réduction de puissance étant déterminée sur la base de (i) le nombre (K) de créneaux inactifs observés dans le premier CAP avant le début du second CAP, et (ii) BC2, K étant un nombre entier positif.
PCT/KR2020/004376 2019-03-29 2020-03-30 Dispositif et procédé d'émission et de réception d'un signal sans fil dans un système de communication sans fil WO2020204556A1 (fr)

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