WO2022031103A1 - 무선 통신 시스템에서 무선 신호 송수신 방법 및 장치 - Google Patents
무선 통신 시스템에서 무선 신호 송수신 방법 및 장치 Download PDFInfo
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- WO2022031103A1 WO2022031103A1 PCT/KR2021/010396 KR2021010396W WO2022031103A1 WO 2022031103 A1 WO2022031103 A1 WO 2022031103A1 KR 2021010396 W KR2021010396 W KR 2021010396W WO 2022031103 A1 WO2022031103 A1 WO 2022031103A1
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- 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
- H04L1/1829—Arrangements specially adapted for the receiver end
- H04L1/1854—Scheduling and prioritising arrangements
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- 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
- H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
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- 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
- H04L1/1822—Automatic repetition systems, e.g. Van Duuren systems involving configuration of automatic repeat request [ARQ] with parallel processes
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- 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
- H04L1/1829—Arrangements specially adapted for the receiver end
- H04L1/1858—Transmission or retransmission of more than one copy of acknowledgement message
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- 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
- H04L1/1829—Arrangements specially adapted for the receiver end
- H04L1/1861—Physical mapping arrangements
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- 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
- H04L1/1829—Arrangements specially adapted for the receiver end
- H04L1/1864—ARQ related signaling
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/12—Wireless traffic scheduling
- H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
- H04W72/1273—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows of downlink data flows
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/04—Large scale networks; Deep hierarchical networks
- H04W84/06—Airborne or Satellite Networks
Definitions
- the present invention relates to a wireless communication system, and more particularly, to a method and apparatus for transmitting and receiving a wireless signal.
- a wireless communication system is a multiple access system that can support communication with multiple users by sharing available system resources (bandwidth, transmission power, etc.).
- Examples of the multiple access system include a code division multiple access (CDMA) system, a frequency division multiple access (FDMA) system, a time division multiple access (TDMA) system, an orthogonal frequency division multiple access (OFDMA) system, and a single carrier frequency (SC-FDMA) system. division multiple access) systems.
- 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 an improved HARQ method and an apparatus therefor in order to solve a latency problem caused by a relatively long Round-Trip Time (RTT) in a Non-Terrestrial Network (NTN) environment.
- RTT Round-Trip Time
- NTN Non-Terrestrial Network
- a method for operating a terminal in a wireless communication system includes: receiving control information for disabling at least one of a plurality of Hybrid Automatic Repeat and reQuest (HARQ) processes; the control Receiving a downlink signal based on the information, and based on a HARQ-ACKnowledgement (HARQ-ACK) codebook determined based on the control information, determining whether to perform HARQ feedback on the downlink signal step, wherein the HARQ-ACK codebook may be determined based on at least one enabled HARQ process among the plurality of HARQ processes.
- HARQ-ACK HARQ-ACKnowledgement
- a terminal operating in a wireless communication system is operatively connected to at least one radio frequency (RF) unit, at least one processor, and the at least one processor, and when executed, the at least one at least one computer memory for causing one processor to perform an operation, the operation comprising: receiving control information for disabling at least one of a plurality of Hybrid Automatic Repeat and reQuest (HARQ) processes; Receive a downlink signal based on the control information, and determine whether to perform HARQ feedback on the downlink signal based on a HARQ-ACKnowledgement (HARQ-ACK) codebook determined based on the control information, and , the HARQ-ACK codebook may be determined based on at least one enabled HARQ process among the plurality of HARQ processes.
- HARQ-ACK HARQ-ACKnowledgement
- an apparatus for a terminal comprising: at least one processor; and at least one processor operatively connected to the at least one processor and, when executed, causes the at least one processor to perform an operation.
- a computer memory comprising: receiving control information for disabling at least one of a plurality of Hybrid Automatic Repeat and reQuest (HARQ) processes; receiving a downlink signal based on the control information; , determines whether to perform HARQ feedback on the downlink signal based on a HARQ-ACKnowledgement (HARQ-ACKnowledgement) codebook determined based on the control information, and the HARQ-ACK codebook includes the plurality of HARQ processes It may be determined based on at least one enabled HARQ process.
- HARQ Hybrid Automatic Repeat and reQuest
- 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 plurality of Hybrid Automatic Repeat and reQuest) process, receiving control information for disabling at least one of the processes, receiving a downlink signal based on the control information, and determining HARQ-ACK (HARQ-ACKnowledgement) codebook based on the control information based on whether to perform HARQ feedback on the downlink signal, and the HARQ-ACK codebook may be determined based on at least one enabled HARQ process among the plurality of HARQ processes.
- HARQ-ACK HARQ-ACKnowledgement
- a fifth aspect of the present invention in a method for a base station to operate in a wireless communication system, transmitting control information for disabling at least one of a plurality of Hybrid Automatic Repeat and reQuest (HARQ) processes, the Transmitting a downlink signal based on control information, and receiving HARQ feedback for the downlink signal based on a HARQ-ACKnowledgement (HARQ-ACK) codebook determined based on the control information.
- the HARQ-ACK codebook may be determined based on at least one enabled HARQ process among the plurality of HARQ processes.
- a base station operating in a wireless communication system is operatively connected to at least one radio frequency (RF) unit, at least one processor, and the at least one processor, and when executed, the at least one at least one computer memory for causing one processor to perform an operation, the operation comprising: transmitting control information for disabling at least one of a plurality of Hybrid Automatic Repeat and reQuest (HARQ) processes; Transmitting a downlink signal based on the control information, and receiving HARQ feedback for the downlink signal based on a HARQ-ACKnowledgement (HARQ-ACK) codebook determined based on the control information.
- the HARQ-ACK codebook may be determined based on at least one enabled HARQ process among the plurality of HARQ processes.
- the at least one enabled HARQ process may include the remaining HARQ processes except for at least one disabled HARQ process based on the control information among the plurality of HARQ processes.
- the plurality of HARQ processes are configured for each of a plurality of cells configured for the terminal, and the HARQ-ACK codebook may be determined based on a cell including the at least one enabled HARQ process. .
- the at least one disabled HARQ process may be excluded from the determination process of the HARQ-ACK codebook.
- the terminal may ignore a Counter-Downlink Assignment Indicator (C-DAI) value of Donwlink Control Information (DCI) indicating the at least one disabled HARQ process.
- C-DAI Counter-Downlink Assignment Indicator
- DCI Donwlink Control Information
- the HARQ-ACK codebook may include a Type 1 HARQ-ACK codebook, a Type 2 HARQ-ACK codebook, or a Type 3 HARQ-ACK codebook.
- the timing offset for performing the HARQ feedback may be indicated based on a value determined based on a resource index and a specific field value having a fixed size in Downlink Control Information (DCI).
- DCI Downlink Control Information
- the resource index is a specific index of a slot in which a Physical Downlink Control Channel (PDCCH) or a Physical Downlink Shared Channel (PDSCH) scheduled by the PDCCH is received, a System Frame Number (SFN), or a PDCCH is received It may include the index of the CCE (Control Channel Element).
- PDCH Physical Downlink Control Channel
- PDSCH Physical Downlink Shared Channel
- SFN System Frame Number
- CCE Control Channel Element
- a wireless communication system may include a Non-Terrestrial Network (NTN).
- NTN Non-Terrestrial Network
- wireless signal transmission and reception can be efficiently performed in a wireless communication system.
- the HARQ-ACK codebook when HARQ feedback is disabled, the HARQ-ACK codebook can be configured more efficiently.
- 1 is a diagram for explaining physical channels used in a 3GPP NR system and a general signal transmission method using them.
- 3 shows the structure of an NR radio frame.
- 5 is a diagram for explaining an HARQ-ACK operation.
- NTN non-terrestrial network
- NTN non-terrestrial network
- FIG. 8 is a diagram for explaining the TA components of the NTN.
- FIG. 9 is a flowchart illustrating a method for a terminal to perform a UL transmission operation in NTN according to an embodiment.
- FIG. 10 is a flowchart illustrating a method for a terminal to perform a DL reception operation in NTN according to an embodiment.
- FIG. 11 is a flowchart illustrating a method for a base station to perform a UL reception operation based on the above-described embodiments.
- FIG. 12 is a diagram for explaining a method for a base station to perform a DL transmission operation based on the above-described embodiments.
- FIG. 13 is a diagram illustrating a method of identifying a HARQ process based on the smallest CCE index according to the proposed embodiment.
- FIG. 14 is a flowchart illustrating an operation of a terminal according to the proposed embodiments.
- 15 is a flowchart illustrating an operation of transmitting and receiving a UL signal between a base station and a terminal based on the proposed embodiments.
- 16 is a flowchart illustrating an operation of transmitting and receiving a DL signal between a base station and a terminal based on the proposed embodiments.
- FIG. 17 illustrates a communication system applied to the present invention.
- FIG 19 shows another example of a wireless device applied to the present invention.
- 20 illustrates a vehicle or an autonomous driving vehicle to which the present invention is applied.
- VSAT very-small-aperture terminal
- IAB 22 shows an example of an Integrated Access Backhaul (IAB) to which the present invention is applied.
- IAB Integrated Access Backhaul
- 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 a radio technology 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 radio technology such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, Evolved UTRA (E-UTRA), and the like.
- UTRA is part of the Universal Mobile Telecommunications System (UMTS).
- 3GPP (3rd Generation Partnership Project) long term evolution (LTE) is a part of Evolved UMTS (E-UMTS) using E-UTRA
- LTE-A Advanced
- 3GPP NR New Radio or New Radio Access Technology
- 3GPP LTE/LTE-A is an evolved version of 3GPP LTE/LTE-A.
- next-generation communication As more and more communication devices require a larger communication capacity, the need for improved mobile broadband communication compared to the existing RAT (Radio Access Technology) is emerging.
- massive MTC Machine Type Communications
- massive MTC Machine Type Communications
- a communication system design in consideration of a service/terminal sensitive to reliability and latency is being discussed.
- the introduction of the next-generation RAT in consideration of eMBB (enhanced Mobile BroadBand Communication), massive MTC, and URLLC (Ultra-Reliable and Low Latency Communication) is being discussed, and in the present invention, for convenience, the technology is NR (New Radio or New RAT). it is called
- 3GPP NR is mainly described, but the technical spirit of the present invention is not limited thereto.
- a terminal receives information through a downlink (DL) from a base station, and the terminal transmits information through an uplink (UL) to the base station.
- Information transmitted and received between the base station and the terminal includes data and various control information, and various physical channels exist according to the type/use of the information they transmit and receive.
- 1 is a diagram for explaining physical channels used in a 3GPP NR system and a general signal transmission method using them.
- a terminal newly entering a cell performs an initial cell search operation such as synchronizing with the base station in step S101.
- the terminal receives a synchronization signal block (SSB) from the base station.
- the 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 UE synchronizes with the base station based on PSS/SSS and acquires information such as cell identity.
- the UE 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 the 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, and receives more specific System information can be obtained.
- PDCH 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 terminal 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 can be received (S104).
- PRACH physical random access channel
- S104 a response message to the preamble through a physical downlink control channel and a corresponding physical downlink shared channel can be received
- 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 done.
- the UE After performing the procedure as described above, the UE performs a physical downlink control channel/physical downlink shared channel reception (S107) and a physical uplink shared channel (Physical Uplink Shared Channel, PUSCH)/ A physical uplink control channel (PUCCH) transmission (S108) may be performed.
- Control information transmitted by the terminal to the base station is collectively referred to as uplink control information (UCI).
- UCI includes HARQ ACK/NACK (Hybrid Automatic Repeat and reQuest Acknowledgment/Negative-ACK), SR (Scheduling Request), CSI (Channel State Information), and the like.
- CSI includes a Channel Quality Indicator (CQI), a Precoding Matrix Indicator (PMI), and a Rank Indication (RI).
- 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 at the same time. In addition, UCI may be transmitted aperiodically through PUSCH according to a request/instruction of a network.
- the NG-RAN may include a general Node B (gNB) and/or an evolved Node B (eNB) that provides user plane and control plane protocol termination to the UE.
- a gNB or eNB may be referred to as a base station according to an embodiment.
- 2 illustrates a case in which only gNBs are included.
- the gNB and the eNB are connected to each other through an Xn interface.
- the gNB and the eNB are connected to the 5G Core Network (5GC) through the NG interface. More specifically, it is connected to an access and mobility management function (AMF) through an NG-C interface, and is connected to a user plane function (UPF) through an NG-U interface.
- AMF access and mobility management function
- UPF user plane function
- 3 illustrates the structure of a radio frame.
- uplink and downlink transmission consists of frames.
- 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 5 1ms subframes (Subframe, SF).
- a subframe is divided into one or more slots, and the number of slots in a 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).
- OFDM Orthogonal Frequency Division Multiplexing
- CP cyclic prefix
- Table 1 exemplifies that the number of symbols per slot, the number of slots per frame, and the number of slots per subframe vary according to SCS when CP is usually used.
- N slot symb The number of symbols in the slot
- Table 2 illustrates that when the 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 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 numerology
- SCS OFDM numerology
- the (absolute time) interval of a time resource eg, SF, slot, or TTI
- TU Time Unit
- the symbol may include an OFDM symbol (or a CP-OFDM symbol) and an SC-FDMA symbol (or a Discrete Fourier Transform-spread-OFDM, a DFT-s-OFDM symbol).
- NR supports multiple numerology (or subcarrier spacing (SCS)) to support various 5G services. For example, when SCS is 15kHz, it supports a wide area in traditional cellular bands, and when SCS is 30kHz/60kHz, dense-urban, lower latency and a wider carrier bandwidth, and when the SCS is 60 kHz or higher, a bandwidth greater than 24.25 GHz 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.
- FR2 may mean a millimeter wave (mmW).
- 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 includes 12 symbols.
- the carrier includes a plurality of subcarriers in the frequency domain.
- a resource block (RB) is defined as a plurality of (eg, 12) consecutive subcarriers in the frequency domain.
- a bandwidth part (BWP) is defined as a plurality of consecutive physical RBs (PRBs) in the frequency domain, and may correspond to one numerology (eg, SCS, CP length, etc.).
- a carrier may include a maximum of N (eg, 5) BWPs. Data communication is performed through the activated BWP, and only one BWP can be activated for 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
- HARQ-ACK hybrid automatic repeat request-acknowledgement
- 5 is a diagram for explaining an HARQ-ACK operation.
- the HARQ-ACK information is information indicating whether the UE has successfully received a DL signal (eg, a DL control signal or a DL data signal).
- a DL signal eg, a DL control signal or a DL data signal.
- the UE may be referred to as a terminal according to embodiments.
- ACK ACKnowledgement
- NACK negative ACK
- HARQ-ACK in NR may have the following 1) and 2) characteristics.
- HARQ-ACK feedback of 1 bit per transport block may be supported.
- HARQ-ACK feedback may be used in the same meaning as HARQ feedback.
- the operation of one DL HARQ process is supported for some UEs, whereas the operation of one or more DL HARQ processes is supported for a given UE.
- the UE may support a set of minimum HARQ processing time.
- the minimum HARQ processing time means the minimum time required from the time the terminal receives the DL data (eg, PDSCH) to transmit the HARQ-ACK corresponding to the received DL data.
- two types of terminal processing times (N1, K1) may be defined according to (1) symbol granularity and (2) slot granularity.
- K1 may mean the number of slots from the slot of the PDSCH to the slot of the HARQ-ACK corresponding to the PDSCH. That is, K1 may mean the number of slots from the slot in which the PDSCH is received to the slot in which the HARQ-ACK corresponding to the PDSCH is transmitted.
- N1 means the number of OFDM symbols required for processing of the UE from the end of PDSCH reception to the earliest start time of HARQ-ACK transmission corresponding to the PDSCH. That is, N1 may mean the number of OFDM symbols required for processing of the UE from the point in time when the reception of the PDSCH ends to the earliest time when the transmission of the HARQ-ACK corresponding to the PDSCH starts.
- the N1 may be defined as shown in Tables 4 and 5 below according to OFDM numerology (ie, subcarrier spacing) and DMRS pattern.
- the HARQ-ACK timing K1 may mean the number of slots from a PDSCH slot to a HARQ-ACK slot corresponding to the PDSCH.
- K0 represents the number of slots from a slot with a DL grant PDCCH to a slot with a corresponding PDSCH transmission
- K2 represents the number of slots from a slot with a UL grant PDCCH to a slot with a corresponding PUSCH transmission.
- K1 may mean the number of slots from a slot in which a PDSCH is received to a slot in which an HARQ-ACK corresponding to the PDSCH is transmitted
- K0 corresponds to the PDCCH from a slot in which a DL grant PDCCH is received.
- K2 may mean the number of slots from a slot in which a PDCCH including a UL grant is received to a slot in which a PUSCCH corresponding to the PDCCH is transmitted. That is, KO, K1, and K2 can be briefly summarized as shown in Table 6 below.
- the base station may provide the HARQ-ACK feedback timing to the terminal dynamically through DCI or semi-statically through RRC signaling. For example, when HARQ-ACK feedback timing is dynamically provided through DCI, slot timing between A and B is indicated from among the set of values through a specific field of DCI.
- NR supports different minimum HARQ processing times between UEs.
- the HARQ processing time includes a delay between the reception timing of the DL data and the transmission timing of the HARQ-ACK corresponding to the DL data and the delay between the reception timing of the UL grant and the transmission timing of the UL data corresponding to the UL grant can do.
- the UE transmits its capability regarding the minimum HARQ processing time to the base station.
- Asynchronous and adaptive DL HARQ are supported at least in eMBB and URLLC.
- Table 7 below is an excerpt from the 38.214 standard document regarding timing from when the PDSCH is received to when HARQ-ACK information is transmitted.
- parameters such as d 1,1 and d 2 may be determined according to 38.214 and 38.211 standards.
- HARQ ACK/NACK feedback for a plurality of DL transmissions in the time domain may be transmitted in one UL data/control domain.
- the timing between the reception of the DL data and the transmission of an acknowledgment corresponding to the received DL data is indicated among a set of values by a field in the DCI, the set of values being in the upper layer. can be set by The timing is defined at least when the timing is not known to the UE.
- a dynamic HARQ-ACK codebook scheme and a quasi-static HARQ-ACK codebook scheme are supported.
- the HARQ-ACK codebook may be replaced with a HARQ-ACK payload.
- a Total-Downlink Assignment Index (T-DAI) field and/or a Counter-DAI (C-DAI) field may be configured in DCI.
- the UE may generate HARQ-ACK information for the PDSCH actually scheduled by PDCCH monitoring occasions based on the T-DAI and/or C-DAI value and transmit it to the base station.
- the dynamic HARQ-ACK codebook may be referred to as a Type 2 HARQ-ACK codebook, which will be described later.
- the size of the HAQ-ACK payload may change according to the actual number of scheduled DL data.
- the PDCCH scheduling the DL signal includes C-DAI and T-DAI.
- C-DAI indicates a ⁇ CC, slot ⁇ scheduling order value calculated in a CC (Component Carrier) (or cell)-first method, and is used to designate the position of the HARQ-ACK bit in the HARQ-ACK codebook.
- T-DAI indicates the accumulated value of slot-unit scheduling up to the current slot, and is used to determine the size of the HARQ-ACK codebook.
- the semi-static HARQ-ACK codebook method in consideration of a plurality of PDSCH-to-HARQ-ACK feedback timings configured in the UE, HARQ-ACK bit for all PDCCH monitoring opportunities associated with a specific PUCCH transmission time (monitoring occasions) create and send
- the semi-static HARQ-ACK codebook may be referred to as a Type 1 HARQ-ACK codebook, which will be described later.
- the semi-static HARQ-ACK codebook may be treated as a NACK for a PDSCH that is not scheduled in the PDCCH monitoring opportunities.
- HARQ-ACK transmission for a plurality of cells may be multiplexed onto one PUCCH and transmitted.
- NTN Non-Terrestrial Network
- NTN non-terrestrial network
- a non-terrestrial network refers to a wireless network configured using satellites (eg, geostationary orbiting satellites (GEO)/low orbiting satellites (LEO)). Based on NTN, coverage may be extended and a highly reliable network service may be possible. For example, the NTN alone may be configured, or a wireless communication system may be configured in combination with a conventional terrestrial network. For example, in NTN, i) a link between a satellite and a UE, ii) a link between satellites, iii) a link between a satellite and a gateway, etc. may be configured.
- the following terms may be used to describe the configuration of a wireless communication system using satellites.
- LEO Low-Earth Orbit
- MEO Medium-Earth Orbit
- GEO Geostationary satellite Earth Orbit
- - Satellite network Network, or segments of network, using a space-borne vehicle to embark a transmission equipment relay node or base station.
- Satellite RAT a RAT defined to support at least one satellite.
- - 5G Satellite RAT a Satellite RAT defined as part of the New Radio.
- 5G satellite access network 5G access network using at least one satellite.
- Network or segments of a network located at the surface of the Earth.
- Use cases that can be provided by a communication system using a satellite connection can be divided into three categories.
- the “Service Continuity” category can be used to provide network connectivity in geographic areas where 5G services cannot be accessed through the wireless coverage of terrestrial networks.
- a UE associated with a pedestrian user or a UE on a moving land-based platform e.g., car, coach, truck, train
- air platform e.g., commercial or private jet
- off-shore platform e.g., marine vessel
- a satellite connection may be used for In the “Service Ubiquity” category, when terrestrial networks are unavailable (eg disaster, destruction, economic reasons, etc.), satellite connections can be used for IOT/public safety-related emergency networks/home access, etc.
- the “Service Scalability” category includes services using wide coverage of satellite networks.
- the 5G satellite access network may be connected to a 5G core network (Core Network).
- the satellite may be a bent pipe satellite or a regenerative satellite.
- NR radio protocols may be used between the UE and the satellite.
- the F1 interface can be used between the satellite and the gNB.
- a non-terrestrial network refers to a wireless network configured using a device that is fixed on the ground, such as a satellite, and does not exist, and a representative example is a satellite network. Based on NTN, coverage may be extended and a highly reliable network service may be possible. For example, NTN may be configured alone, or may be combined with an existing terrestrial network to form a wireless communication system.
- the “Service Continuity” category can be used to provide network connectivity in geographic areas where 5G services cannot be accessed through the wireless coverage of terrestrial networks. For example, UEs associated with pedestrian users or UEs on moving land-based platforms (e.g. cars, coaches, trucks, trains), air platforms (e.g. commercial or private jets) or off-shore platforms (e.g. marine vessels) A satellite connection may be used for In the “Service Ubiquity” category, when terrestrial networks are unavailable (eg disaster, destruction, economic reasons, etc.), satellite connections can be used for IOT/public safety-related emergency networks/home access, etc.
- the “Service Scalability” category includes services using wide coverage of satellite networks.
- NTN includes one or more satellites 410, one or more NTN gateways 420 capable of communicating with satellites, one or more UEs (/BS) 430 capable of receiving mobile satellite services from the satellites, etc.
- NTN is not only the satellite, but also an aerial vehicle (eg, Unmanned Aircraft Systems (UAS), Tethered UAS (TUA), Lighter than Air UAS (LTA), Heavier than Air UAS (HTA)). ), all operating entities at altitudes typically between 8 and 50 km, including High Altitude Platforms (HAPs)), and the like.
- UAS Unmanned Aircraft Systems
- TAA Tethered UAS
- LTA Lighter than Air UAS
- HTA Heavier than Air UAS
- the satellite 410 is a space-borne vehicle equipped with a bent pipe payload or a regenerative payload telecommunication transmitter and is located in a low earth orbit (LEO), a medium earth orbit (MEO), or a Geostationary Earth Orbit (GEO). can do.
- the NTN gateway 420 is an earth station or gateway that exists on the Earth's surface and provides sufficient RF power/sensitivity to access the satellite.
- the NTN gateway corresponds to a transport network layer (TNL) node.
- TNL transport network layer
- a link between a satellite and a UE i) a link between a satellite and a UE, ii) a link between satellites, iii) a link between a satellite and an NTN gateway, etc. may exist.
- a service link refers to a radio link between a satellite and a UE.
- ISL inter-satellite links
- a feeder link refers to a radio link between an NTN gateway and a satellite (or UAS platform).
- the gateway may be connected to a data network, and may perform transmission/reception with a satellite through a feeder link.
- the UE can transmit and receive via satellite and service link.
- NTN operation scenario can consider two scenarios based on transparent payload and regenerative payload, respectively.
- 5( a ) shows an example of a scenario based on a transparent payload.
- the signal repeated by the payload is not changed.
- Satellite 410 repeats the NR-Uu air interface from feeder link to service link (or vice versa), and the satellite radio interface (SRI) on the feeder link is NR-Uu.
- the NTN gateway 420 supports all functions necessary to transmit the signal of the NR-Uu interface. Also, different transparent satellites can be connected to the same gNB on the ground.
- 5( b ) shows an example of a scenario based on regenerative payload.
- the scenario based on the regenerative payload refers to a scenario in which the satellite 410 can perform some or all of the functions of a conventional base station (eg gNB), and thus performs some or all of frequency conversion/demodulation/decoding/modulation, etc. .
- the service link between the UE and the satellite uses the NR-Uu air interface, and the feeder link between the NTN gateway and the satellite uses a satellite radio interface (SRI).
- SRI corresponds to a transport link between the NTN gateway and the satellite.
- the UE 430 may be simultaneously connected to 5GCN via an NTN-based NG-RAN and a conventional cellular NG-RAN.
- the UE may be simultaneously connected to 5GCN via two or more NTNs (eg, LEO NTN+GEO NTN, etc.).
- NTN non-terrestrial network
- NTN refers to a network or network segment that uses RF resources in a satellite (or UAS platform).
- Typical scenarios of NTN providing access to user equipment include an NTN scenario based on a transparent payload as shown in Fig. 7(a) and an NTN scenario based on a regenerative payload as shown in Fig. 7(b).
- Non-Terrestrial Network to the public data network
- -GEO satellites are served by one or several satellite gateways deployed in satellite target coverage (eg regional or continental coverage) (or it can be assumed that the UE of a cell is served by only one sat-gateway )
- Non-GEO satellites can be served consecutively from one or several satellite gates at a time. This system ensures continuity of service and feeder links between continuous service satellite gateways for a sufficient time to proceed with mobility anchoring and handover.
- a satellite capable of implementing a -transparent payload or a regenerative (with on board processing) payload.
- the satellite (or UAS platform) generated beam several beams may be generated in a service area that is generally bounded by a field of view.
- the footprints of the beam may generally be elliptical.
- the view of the satellite (or UAS platform) may vary according to the onboard antenna diagram and the min elevation angle.
- radio frequency filtering radio frequency conversion and amplification (here, the waveform signal repeated by the payload may not be changed)
- radio frequency filtering radio frequency transformation and amplification as well as demodulation/decoding, switching and/or routing, coding/modulation (which has all or part of the base station functionality (eg gNB) in the satellite (or UAS platform)) may be substantially the same).
- ISL inter-satellite links
- ISLs may operate at RF frequencies or broadbands (optical bands).
- the terminal may be serviced by a satellite (or UAS platform) within the target service area.
- a satellite or UAS platform
- Table 8 below defines various types of satellites (or UAS platforms).
- LEO Low-Earth Orbit
- MEO Medium-Earth Orbit
- GEO Geostationary Earth Orbit
- HAPS High Elliptical Orbit
- HEO High Elliptical Orbit
- GEO satellites and UAS can be used to provide continental, regional or regional services.
- LEO and MEO constellations can be used to provide services in both the Northern and Southern Hemispheres.
- LEO and MEO constellations may provide global coverage, including polar regions. In the future, this may require adequate orbital tilt, sufficient beam generation and inter-satellite links.
- the HEO satellite system may not be considered in relation to NTN.
- An NTN providing access to a terminal can be considered in six reference scenarios described below.
- Scenario A Transparent (including radio frequency function only)
- Scenario C Transparent (including radio frequency function only)
- Scenario D Regenerative (including all or part of RAN functions)
- Each satellite can steer its beam to a fixed point on Earth using beamforming technology. This can be applied for a period corresponding to the satellite's visibility time.
- the maximum delay variation in the beam can be calculated based on the minimum elevation angle for both the gateway and the terminal.
- the maximum differential delay in the beam can be calculated based on the Max beam foot print diameter at the nadir.
- the maximum differential delay at the cell level may be calculated by considering the beam level delay for the largest beam size. Meanwhile, when the beam size is small or medium, it may not be excluded that the cell may include two or more beams. However, the accumulated differential delay of all beams in the cell does not exceed the maximum differential delay at the cell level in the above tables.
- the NTN study results are applicable not only to GEO scenarios, but also to all NGSO scenarios with circular orbits with an altitude of more than 600 km.
- NTN offset (NTAoffset) may not be plotted.
- the wireless system based on NTN may consider improvements to ensure timing and frequency synchronization performance for UL transmission, taking into account larger cell coverage, long round trip time (RTT) and high Doppler.
- RTT round trip time
- timing advance of initial access and subsequent TA maintenance/management are illustrated. Descriptions of terms defined in relation to FIG. 10 are as follows.
- the TA value required for UL transmission including the PRACH may be calculated by the UE.
- the coordination may be performed using a UE-specific differential TA (UE-specific differential TA) or a constituting of UE specific differential TA and common TA (TA).
- UE-specific differential TA UE-specific differential TA
- TA common TA
- an additional requirement for the network to manage the timing offset between the DL and UL frame timing may be considered (Additional needs for the network to manage the timing offset between the DL and UL frame timing can be considered, if impacts introduced by feeder link is not compensated by UE in corresponding compensation).
- UE specific differential TA UE specific differential TA
- an additional indication of a single reference point should be signaled to the UEs per beam/cell.
- the timing offset between DL and UL frame timing can be managed in the network regardless of the satellite payload type.
- an additional TA may be signaled from the network to the UE for TA improvement. For example, it may be determined in normal work during initial access and/or TA maintenance.
- a common TA that refers to a common component of propagation delay shared by all UEs within the coverage of the same satellite beam/cell may be broadcast by the network for each satellite beam/cell.
- the network may calculate the common TA by assuming at least one reference point per satellite beam/cell.
- An indication of UE specific differential TA from the network may be required with a conventional TA mechanism (Rel-15). Expansion of value range for TA indication in RAR can be identified explicitly or implicitly to satisfy larger NTN coverage. Whether to support a negative TA value in the corresponding indication may be indicated. In addition, indication of a timing drift rate from the network to the UE may be supported to enable TA adjustment at the UE side.
- a single reference point per beam can be considered as the baseline to calculate the common TA. Whether and how to support multiple reference points may require further discussion.
- the following solution may be identified in consideration of beam specific post-compensation of a common frequency offset on the network side at least in the case of an LEO system.
- both the pre-compensation and estimation of the UE-specific frequency offset may be performed at the UE side (Both the estimation and pre-compensation of UE-specific frequency) offset are conducted at the UE side). Acquisition of this value (or pre-compensation and estimation of UE-specific frequency offset) may be performed by utilizing a DL reference signal, UE position, and satellite ephemeris.
- At least the frequency offset required for UL frequency compensation in the LEO system may be indicated to the UE by the network. Acquisition of this value may be performed on the network side by detecting a UL signal (eg, a preamble).
- a UL signal eg, a preamble
- a compensated frequency offset value by the network for a case in which the network performs frequency offset compensation in the uplink and/or the downlink, respectively, may be indicated or supported.
- the Doppler drift rate may not be indicated. The design of the signal in this regard may be further discussed later.
- the HARQ round trip time of NR may be on the order of several ms.
- NTN's propagation delay can be much longer (than conventional communication systems), from a few milliseconds to hundreds of milliseconds, depending on the satellite's orbit. Therefore, HARQ RTT can be much longer (than conventional communication systems) in NTN. Therefore, potential impacts and solutions for HARQ procedures need to be further discussed.
- RAN1 focused on the physical layer aspect
- RAN2 focused on the MAC layer aspect.
- disabling of HARQ in NR NTN may be considered.
- a problem may occur with respect to 1 MAC CE and RRC signaling not received by the UE, or 2 DL packets not correctly received by the UE for a long period of time without the gNB knowing.
- the above-described problem can be considered in the following manner in NTN.
- a solution that prevents the reduction of peak data rates in NTN can be considered.
- One solution is to increase the number of HARQ processes to match longer satellite round-trip delays to avoid stopping and waiting in HARQ procedures.
- UL HARQ feedback can be disabled to avoid stopping and waiting in the HARQ procedure and relying on RLC ARQ for reliability.
- the throughput performance of the two types of solutions described above was evaluated at link level and system level by several contributing companies.
- TDL-D with elevation angles of 30 degrees with BLER target of 1% for RLC ARQ using 16 HARQ processes and BLER targeting 1% and 10% using 32/64/128/256 HARQ processes One source simulated with suburban channels. There is no observable gain in throughput even when the number of HARQ processes increases compared to RLC layer retransmission using RTT at ⁇ 32, 64, 128, 256 ⁇ ms (One source simulated with a TDL-D suburban channel with elevation angle of 30 degrees with BLER target of 1% for RLC ARQ with 16 HARQ processes, and BLER targets 1% and 10% with 32/64/128/256 HARQ processes. transmission with RTT in ⁇ 32, 64, 128, 256 ⁇ ms)
- the BLER target is 1% for RLC ARQ using 16 HARQ processes, and BLER targets 1% and 10% using 32 HARQ processes.
- the channel is assumed to be TDL-D with delay spread/K-factor taken from the system channel model in the suburban scenario with an elevation angle of 30. Performance gains can be observed in the other channels, and spectral efficiency gains of up to 12.5% can be achieved, especially in the suburbs with a 30° elevation angle, if the channel is assumed to be TDL-A.
- Performance gain can be observed with other channels, especially, up to 12.5% spectral efficiency gain is achieved in case that channel is assumed as TDL-A in suburban with 30° elevation angle. operations: (i) additional MCS offset, (ii) MCS table based on lower efficiency (iii) slot aggregation with differ ent BLER targets are conducted. Significant gain can be observed with enlarging the HARQ process number).
- the spectral efficiency gain per user in 32 HARQ processes compared to 16 HARQ processes may vary depending on the number of UEs. With 15 UEs per beam, an average spectral efficiency gain of 12% at the 50% percentile can be observed. With 20 UEs per cell there is no observable gain.
- - Option B 16+ HARQ process IDs with UL HARQ feedback enabled via RRC.
- 16 or more HARQ process IDs maintenance of a 4-bit HARQ process ID field in UE capability and DCI may be considered.
- the following solution may be considered for 16 or more HARQ processes maintaining a 4-bit HARQ process ID field in DCI.
- one source also considered a solution in the case where the HARQ process ID field increases to more than 4 bits ([65])
- Option A-2 Enable/disable use of configurable HARQ buffer per UE and HARQ process [67], [64], [69]
- FIG. 9 is a flowchart illustrating a method for a terminal to transmit a UL signal in NTN according to an embodiment
- FIG. 10 is a flowchart for explaining a method for a terminal to receive a DL signal in an NTN according to an embodiment.
- At least one step shown in FIGS. 9 and 10 may be omitted depending on circumstances or settings, and the steps shown in FIGS. 9 and 10 are only described for convenience of description and do not limit the scope of the present specification.
- the UE may receive NTN related configuration information and UL data/UL channel related information (M31).
- the UE may receive DCI/control information for transmitting UL data and/or UL channel (M33).
- the DCI/control information may include scheduling information for transmission of the UL data/UL channel.
- the UE may transmit UL data/UL channel based on the scheduling information (M35). The UE transmits UL data/UL channels until all configured/indicated UL data/UL channels are transmitted, and when all UL data/UL channels are transmitted, the corresponding uplink transmission operation may be terminated (M37).
- the UE may receive NTN-related configuration information, DL data, and/or DL channel-related information (M41).
- the UE may receive DL data and/or DCI/control information for DL channel reception (M43).
- the DCI/control information may include scheduling information of the DL data/DL channel.
- the UE may receive DL data/DL channel based on the scheduling information (M45).
- the UE receives DL data/DL channels until all set/indicated DL data/DL channels are received, and when all DL data/DL channels are received, whether feedback information transmission for the received DL data/DL channels is required can be determined (M47, M48).
- the UE may transmit HARQ-ACK feedback (or HARQ feedback), and if not required, the UE may terminate the reception operation without transmitting HARQ-ACK feedback (M49).
- FIG. 11 is a flowchart illustrating a method for a base station to receive a UL signal in NTN according to an embodiment
- FIG. 12 is a flowchart illustrating a method for a base station to transmit a DL signal in NTN according to an embodiment.
- At least one step shown in FIGS. 11 and 12 may be omitted depending on circumstances or settings, and the steps shown in FIGS. 11 and 12 are only described for convenience of description and do not limit the scope of the present specification.
- the base station may transmit NTN-related configuration information, UL data, and/or UL channel-related information to the terminal (M51). Thereafter, the base station may transmit (to the terminal) DCI/control information for transmission of UL data and/or UL channel (M53).
- the DCI/control information may include scheduling information for UL data/UL channel transmission of the UE.
- the base station may receive (from the terminal) the UL data/UL channel transmitted based on the scheduling information (M55).
- the base station receives the UL data/UL channel until all the configured/indicated UL data/UL channels are received, and when all the UL data/UL channels are received, the corresponding uplink reception operation may be terminated (M57).
- the base station may transmit NTN-related configuration information, DL data, and/or DL channel-related information (to the terminal) (M61). Thereafter, the base station may transmit (to the terminal) DCI/control information for DL data and/or DL channel reception (M63).
- the DCI/control information may include scheduling information of the DL data/DL channel.
- the base station may transmit DL data/DL channel (to the terminal) based on the scheduling information (M65).
- the base station transmits the DL data/DL channel until all the set/indicated DL data/DL channels are transmitted. Can be judged (M67, M68). If it is necessary to receive feedback information, the base station receives the HARQ-ACK feedback. If not, the base station may end the DL transmission operation without receiving the HARQ-ACK feedback (M69).
- methods related to HARQ disabling/HARQ enhancement are related to uplink signal transmission and may be equally applied to the downlink signal transmission method in the above-described NR system or LTE system.
- the technical idea proposed in the present specification may be modified or replaced to fit the terms, expressions, structures, etc. defined in each system so as to be implemented in the above-described system.
- NR NTN or LTE NTN service In order to secure wider coverage or to provide a wireless communication service to a place where it is not easy to install a wireless communication base station, using the NR NTN or LTE NTN service is being considered.
- Existing TN (Terrestrial Network) services such as NR and LTE services, provide wireless communication services to terminals by installing the corresponding base station on the ground, whereas NTN service does not install the base station on the ground, but instead installs the base station on the ground. It means providing wireless communication services to terminals by installing base stations other than on the ground, such as mid-orbit, etc.), airplanes, unmanned aerial vehicles, and drones.
- Frequency bands considered in NR NTN service are 2 GHz band (S-band: 2-4 GHz) in the band below 6 GHz, DL 20 GHz in the band above 6 GHz, and the UL 30 GHz band (Ka-Band: 26.5 ⁇ 40 GHz) ))to be.
- the delay may be up to 540 ms.
- the UE performs HARQ feedback
- a latency problem may occur due to a long delay. Accordingly, at a recent standardization meeting, the following conclusions were drawn on disabling HARQ as shown in Table 11.
- the base station performs PDSCH repetition (or slot aggregation) slot aggregation)) based transmission may be performed.
- the PDSCH repetition-based transmission refers to a method of repeatedly transmitting the PDSCH for link reliability between the base station and the terminal.
- the terminal may report/request a minimum slot aggregation level (or a recommended repetition number) (required for successful decoding of the PDSCH) to the base station.
- the UE reports/requests the minimum slot aggregation level or the number of recommended repetitions to the base station periodically/semi-periodically/aperiodically (for example, reporting similarly to CSI) to the base station, thereby allowing the base station to more flexible DL resources It has the advantage of being able to operate it efficiently, and that the terminal can operate the buffer more effectively.
- the base station can semi-statically instruct the terminal which aggregation factor (eg, pdsch -AggregationFactor of pdsch -config ) to use.
- aggregation factor eg, pdsch -AggregationFactor of pdsch -config
- repeated transmission of PDSCH may also be dynamically configured, and an aggregation level may be dynamically indicated to more flexibly indicate PDSCH transmission.
- the configuration regarding repeated PDSCH transmission is determined implicitly by interlocking with the enable/disable indication of HARQ feedback (eg, in case of HARQ disable, repeat PDSCH transmission is performed), data traffic, etc. In consideration of this, it may be explicitly indicated/set using a separate indicator (eg, a repetition enabler).
- Dynamic indication of aggregation level/repetition factor may use a separate indicator in the DCI field or use time domain resource allocation (TDRA).
- TDRA time domain resource allocation
- a step size eg, 1, 2, 4 slots/sub-slots/mini-slots
- Repeat transmission may be performed in units of step size and/or a specific repetition pattern may be dynamically indicated in a slot spaced apart as much as possible.
- HARQ feedback may be set/indicated only when the HARQ feedback is disabled.
- up to 16 HARQ processes may be configured per UE.
- the method of configuring the HARQ-ACK codebook may become ambiguous.
- HARQ feedback when HARQ feedback is disabled, methods for effectively configuring the HARQ-ACK codebook are proposed.
- the following method of configuring the HARQ-ACK codebook may be considered. For example, below, a method of configuring a HARQ-ACK codebook based on an enabled HARQ process among a plurality of HARQ processes is proposed.
- the HARQ-ACK codebook may be referred to as a HARQ codebook according to an embodiment.
- the above-described HARQ-ACK codebook determination information may be referenced/used.
- Type 1 HARQ-ACK codebook (semi-static HARQ-ACK codebook):
- disabling the HARQ process ID may be used as the same meaning as disabling the HARQ process.
- the cell allocates a HARQ-ACK bit for one PDSCH, and HARQ feedback is performed on the HARQ process.
- N eg, two or more HARQ process IDs among the HARQ process IDs of a specific cell are enabled
- an indicator indicating which cell's feedback for which HARQ process eg, C-DAI (counter- DAI), T-DAI (total-DAI)
- C-DAI counter- DAI
- T-DAI total-DAI
- Type I HARQ-ACK codebook configuration proposal can be applied/set only to the case of semi-statically indicating enable/disable of HARQ feedback.
- Type I HARQ-ACK codebook configuration proposal can be applied/configured by limiting to cells in which at least one HARQ ID is enabled.
- the cell is considered as a HARQ feedback-enabled cell, and in the Type 1 HARQ-ACK codebook configuration may be included.
- the cell is considered as a cell in which HARQ feedback is disabled, and is not included in the Type 1 HARQ-ACK codebook configuration (even though it is a configured cell). it may not be
- the presence or absence of the total-DAI field in the DL DCI is determined according to the number of cells (scheduled # of CC (Component Carrier)) and (single In the case of CC, only the C-DAI field exists), the ACK/NACK granularity in the HARK-ACK codebook according to the maximum number of transport blocks (TB) or code block groups (CBGs) set in each cell (that can be transmitted through a single PDSCH) (that is, , the number of ACK/NACK bits mapped per PDSCH) and/or the number of UL DAI fields are determined.
- TB transport blocks
- CBGs code block groups
- determining the parameter values including cells in which HARQ feedback is disabled may cause DCI overhead and/or redundancy in configuring the HARQ-ACK codebook. Therefore, when configuring/determining the HARQ-ACK codebook parameters, consider only the cell set in which at least one HARQ process ID is (semi-statically) enabled or (dynamically) enabled, not the set of all CA cells. can be
- the cell is regarded as a cell in which HARQ feedback is enabled, and the HARQ-ACK codebook This can be configured and the associated parameter values can be determined.
- HARQ feedback enable/disable is configured with the HARQ process pool concept (eg, one pool is a group of disabled HARQ processes, the other pool is a group of enabled HARQ processes),
- a HARQ-ACK codebook may be configured and related parameter values may be determined.
- the HARQ process pool may mean a set/group/pool of HARQ processes including one or more HARQ process IDs.
- Enabling/disabling of HARQ feedback may be configured in units of HARQ process pools. For example, when a specific HARQ process pool is set to enable, the HARQ process included in the enabled HARQ process pool is enabled, and the HARQ-ACK codebook is configured by limiting the cells corresponding to the enabled HARQ process ID. and related parameter values may be determined.
- the other HARQ process pool consists of enableable HARQ processes and is limited to cells corresponding to the HARQ process ID included in the enableable pool.
- the HARQ-ACK codebook is configured, and related parameter values can be determined.
- HARQ process ID-based Type 3 HARQ-ACK codebook was additionally introduced.
- HARQ feedback is enabled/disabled (dynamically/semi-static), it may be more appropriate to use a Type 3 HARQ-ACK codebook based on the HARQ process ID.
- the HARQ-ACK codebook is configured only for HARQ process IDs that are enabled for each cell and which are likely to be enabled, and related parameter values can be determined.
- HARQ-ACK codebook may be configured and related parameter values may be determined.
- the HARQ process pool may mean a set/group/pool of HARQ processes including one or more HARQ process IDs.
- Enabling/disabling of HARQ feedback may be configured in units of HARQ process pools. For example, when a specific HARQ process pool is set to be enabled, the HARQ process included in the corresponding pool is enabled, the HARQ-ACK codebook is configured limited to cells corresponding to the enabled HARQ process ID, and the related parameter values are can be decided.
- the HARQ process pool may mean a set/group/pool of HARQ processes including one or more HARQ process IDs.
- Enabling/disabling of HARQ feedback may be configured in units of HARQ process pools. For example, if one specific HARQ process pool is set to disable only, the other HARQ process pool is composed of enableable HARQ processes, and is limited to cells corresponding to the HARQ process ID included in the enableable pool.
- the HARQ-ACK codebook may be configured and related parameter values may be determined.
- all HARQ process IDs of the cell may be included in the Type 3 HARQ-ACK codebook configuration. . If all of the HARQ process IDs of a specific cell are semi-statically disabled, all HARQ process IDs of the corresponding cell may not be included in the Type 3 HARQ-ACK codebook configuration.
- the HARQ process ID of a specific cell is semi-statically enabled or dynamically enabled/disabled, (semi-statically) enabled or (dynamically) enabled in the cell Only the HARQ process ID that can be enabled may be included in the Type 3 HARQ-ACK codebook configuration. If all or part of the HARQ process ID of a specific cell is semi-statically disabled, the disabled HARQ process ID of the corresponding cell may not be included in the configuration of the Type 3 HARQ-ACK codebook.
- the base station may set/indicate a corresponding value in consideration of the UE's capability report. For example, the terminal reports the number of supportable HARQ processes (eg, the maximum number of supportable HARQ processes) to the base station as the UE capability, and the base station considers the reported UE capability (within the capability range of the terminal) HARQ The number of processes can be set for the terminal. As described above, if the number of HARQ processes is increased, there may be a problem in that the size of the HARQ process ID field indicated by (maximum) 4 bits in the existing DCI field must also be increased.
- non-fall back DCI it may be natural to increase the size of the payload (increase the size of the field) (eg, increase to 5 bits or 6 bits), but fall-back DCI (eg DCI 1_0)
- fall-back DCI eg DCI 1_0
- each based on the Control Channel Element (CCE)/Resource Block (RB) index A method of identifying the HARQ process ID may be considered.
- each HARQ process ID may be distinguished based on the HARQ process number/ID field and the CCE/RB index of the DCI.
- the CCE/RB may be associated with a DCI including the HARQ process ID.
- the CCE/RB may be a CCE in which the PDCCH including the DCI is received, or a specific RB of a PDSCH scheduled by the DCI.
- FIG. 13 is a diagram illustrating a method of identifying a HARQ process based on the smallest CCE index according to the proposed embodiment.
- the result value of the (CCE index mod 2) operation may be located at the front or the back of the composite field.
- the above method can be applied as it is by increasing the modular operation level from 2 to 4 and binarizing the result value of the modular operation. For example, if the CCE index is 6, the result of modulo 4 operation is 2, and if 2 is binarized, it becomes 01. And, as shown in FIG. 13, by locating '01' at the front or the back of the composite bit, 64 HARQ processes can be identified.
- the above-described binarization technique may be various according to embodiments. For example, 0: 00 / 1:01 / 2: 10 / 3: 11 may be used, or conversely, 3: 00 / 2:01 / 1: 10 / 0: 11 may be used as promised.
- the DCI scheduling including the HARQ process ID performs a modular operation on a specific RB index (eg, the lowest RB index or the highest RB index) of the PDSCH.
- HARQ process can be distinguished by placing it at the beginning or the end of the composite bit.
- the number of HARQ processes can be increased up to 32 in Rel-17 NTN, and in Proposition 3, a method of extending the HARQ process ID field according to the increase in the number of HARQ processes was proposed, and accordingly, the K1 value of Extending the range (eg, from 0 to 31) is also contemplated.
- the K1 value of Extending the range eg, from 0 to 31
- K_offset may be an offset separate from K1_offset, which will be described later.
- K_offset was agreed as shown in Table 14 below.
- the range of the K1 value may be determined as follows.
- the range of the current K1 value may indicate a higher layer parameter " dl-DataToUL-ACK " (eg, List of timing for given PDSCH to the DL ACK /0 to 15 values from /0 to 15) /DCI PDSCH-to-HARQ_feedback timing indicator field (bitwidth of the PDSCH-to-HARQ_feedback timing indicator is bit, and I may be determined based on the number of entries included in the higher layer parameter dl-DataToUL-ACK ).
- dl-DataToUL-ACK eg, List of timing for given PDSCH to the DL ACK /0 to 15 values from /0 to 15
- DCI PDSCH-to-HARQ_feedback timing indicator field bitwidth of the PDSCH-to-HARQ_feedback timing indicator is bit, and I may be determined based on the number of entries included in the higher layer parameter dl-DataToUL-ACK ).
- Table 15 shows a mapping relationship between a PDSCH-to-HARQ_feedback timing indicator field value of DCI and a K1 (eg, number of slots) value.
- K1 is indicated through the K1 field of DCI.
- the implicit indication method may include the following embodiments.
- K1_offset becomes 1.
- the implicit K1 indication may be determined based on a slot index or SFN. For example, in the case of an even slot index, the K1_offset value may be determined to be 0, and in the case of an odd slot index, the K1_offset value may be determined to be 1. In other words, the K1 value may be determined based on a value indicated by bits in which the bits of the K1 field and the implicit K1_offset indication are combined.
- the K1 value is based on the lowest / highest CCE index of the PDCCH carrying the DCI or the lowest / highest index of the PDSCH scheduled by the DCI as in proposal 3 can be decided. That is, i) the lowest/highest CCE index of the PDCCH carrying DCI or ii) the lowest/highest index of the PDSCH scheduled by the corresponding DCI of Proposition 3 above may correspond to K1_offset.
- the slot index may be a slot index in which a PDCCH carrying the corresponding DCI is detected, or a specific index of a PDSCH scheduled by the DCI (eg, a start index of the PDSCH).
- K1_offset becomes 16. That is, when the slot indexes are 0 to 15, K1 offset is 0, and when the slot indexes are 16 to 31, K1_offset is 16.
- the aforementioned K1_offset value is an example of a case where there are 32 HARQ processes, and may change as the number of candidates for the K1 value increases or the number of HARQ processes increases.
- the K1_offset value may be a value set by the base station or a value previously agreed between the base station and the terminal.
- the size of the K field is increased (eg, increased to 5 bits), whereas in the case of fallback DCI, the implicit K offset may be applied without increasing the size of the K1 field.
- the Alt 1 method may be used as the application method.
- an implicit indicator is used to indicate K1.
- the implicit indicator may be used to indicate the HARQ process ID.
- the implicit indicator may be commonly applied to the HARQ process ID and the K1 indicator. That is, one implicit bit (one bit obtained in proposal 4) may be located in the MSB or LSB to indicate the HARQ process ID and K1.
- it can be used to indicate the HARQ process ID and K1. For example, values of 0,1,2,3 are obtained by taking modulo-4 instead of modulo-2 in the slot index, and the obtained value may be used to jointly indicate the HARQ process ID and K1.
- 0,1,2,3 obtained by performing modulo-4 operation on the slot index is binarized, and the MSB/LSB of the binarized bits is an indicator of the HARQ process ID and K1, respectively.
- the HARQ process ID and K1 may be indicated.
- HARQ process ID (or K1 indicator) K1 indicator (or HARQ process ID) 0 (00) 0 0 1 (01) 0 One 2 (10) One 0 3 (11) One One
- a 1-bit or 2-bit combination indicator is separately defined in the DCI field, and the combination indicator is combined with one or more specified fields to share the HARQ process ID and K1 in common.
- all or part of the bits of the combination indicator may be located in the MSB or LSB of the last indication bit (eg, 5-bit K1 or HARQ process ID indicator).
- a 1-bit indicator may be defined and used in common with the K1 field and/or the HARQ process ID field.
- the 1-bit indicator may be located in the MSB or the LSB.
- the UE when DCI for scheduling PDSCH indicates a disabled HARQ process, the UE, even if a specific field (eg, K1, PUCCH Resource Indicator (PRI)) exists, the corresponding The field is not read (or ignored) Or, if the disabled HARQ process is indicated, it may be configured as a compact DCI without the specific field Then, the HARQ-ACK codebook configuration is only enabled with HARQ processes If configured, ACK/NACK for the disabled HARQ process is excluded from the codebook configuration In the case of the existing legacy Type-1 HARQ-ACK codebook, the size of the semi-statically set codebook is determined (disabled HARQ process HARQ-ACK for the disabled HARQ process, because there is no information about parameters (K1, PRI) and / or SLIV (Start and Length Indicator Value) associated with HARQ feedback in DCI, "NACK " is reported as
- the disabled HARQ process ID is first set/indicated, or the HARQ-ACK codebook is configured only with the disabled HARQ process ID.
- the HARQ-ACK codebook is configured only with the disabled HARQ process ID.
- the operation of the terminal follows the following embodiment.
- the UE does not read or ignores the C-DAI value of the DCI scheduling the disabled HARQ process ID.
- the ACK/NACK feedback corresponding to the disabled HARQ process ID may be omitted.
- the UE reads the C-DAI value of the DCI scheduled for the disabled HARQ process ID.
- C-DAI The initial value of the C-DAI value is set to 0. (Considering modular operation (2bit ⁇ modulo 4), C-DAI may be indicated as 4 on the DCI field.)
- the UE interprets the C-DAI value as 4. If there is no enabled HARQ process ID received before the reception of the DCI, the UE interprets the C-DAI value as 0 and omits the ACK/NACK feedback for the corresponding HARQ process ID.
- the UE interprets the C-DAI value as 0. For example, if the HARQ feedback of the 7 HARQ process IDs indicated for the Type 2 HARQ-ACK codebook is ⁇ disabled, disabled, disabled, enabled, enabled, disabled, disabled ⁇ , the terminal sets the C-DAI value to 0- It is interpreted as 0-0-1-2--2-2.
- the C-DAI initial value is set to 1, and when the UE receives only the disabled HARQ process ID and the T-DAI value is 1, the UE omits the ACK/NACK feedback.
- the terminal receives the HARQ process ID of ⁇ disabled, disabled, disabled ⁇ , C-DAI is ⁇ 1, 1, 1 ⁇ , and the T-DAI value is 1, the terminal receives the received enabled Since there is no HARQ process ID, the ACK/NACK feedback of the corresponding Type-2 HARQ ACK codebook is omitted.
- the terminal when the terminal receives the HARQ process ID of ⁇ disabled, disabled, enabled ⁇ , the C-DAI value is ⁇ 1, 1, 1 ⁇ , and the T-DAI value is 1, the terminal receives the received enabled HARQ Since the process ID exists, the ACK/NACK codebook size of the Type-2 HARQ ACK codebook is 1 bit and transmitted to the base station.
- the terminal When set/instructed to start with the enabled HARQ process ID, the terminal sets the C-DAI value to 2, and when set/instructed to start with the disabled HARQ process ID, the terminal sets the C-DAI value is set to 1 or invalid. Then, the terminal configures the Type 2 HARQ-ACK codebook by setting the size of the final codebook to (T-DAI value)-1, and feeds it back to the base station.
- the UE omits the ACK/NACK feedback based on the Type 2 HARQ-ACK codebook do.
- a NACK is reported to the base station for a codebook size equal to the T-DAI value (in the above embodiment, a 2-bit codebook).
- the terminal reports ⁇ NACK, NACK ⁇ to the base station.
- the C-DAI value of the disabled HARQ process ID retains the last C-DAI value of the “signaled” enabled HARQ process ID. In this case, if there is no enabled HARQ process ID scheduled yet, the UE ignores the C-DAI in the DCI scheduling the disabled HARQ process ID. Therefore, since there is no valid C-DAI, the UE omits the ACK/NACK feedback for it.
- the terminal interprets the C-DAI value set/indicated by the base station as invalid-invalid-invalid-1-2-2-2 do.
- the terminal is HARQ-ACK Do not piggyback information to PUSCH.
- the PUCCH resource used for HARQ-ACK transmission in a specific slot indicates the slot as the HARQ-ACK timing (K1) and DCIs indicating the enabled HARQ process ID Among them, it is determined based on the PRI indicated by the last received DCI.
- FIG. 14 is a flowchart illustrating an operation of a terminal according to the proposed embodiments.
- the terminal may receive control information for disabling at least one of a plurality of HARQ processes ( S1400 ).
- HARQ-ACK feedback may be disabled.
- at least one of a plurality of HARQ processes configured for HARQ-ACK feedback may be disabled, and disabling the at least one HARQ process may be semi-statically or dynamically configured.
- the terminal may receive a downlink signal based on the control information (S1410).
- the UE typically performs HARQ-ACK feedback on the received downlink signal.
- a method of performing HARQ-ACK feedback may vary.
- the HARQ-ACK codebook may be determined differently from the case where a plurality of HARQ processes are all enabled.
- the HARQ-ACK codebook may be determined based on an enabled HARQ process instead of all of the plurality of HARQ processes.
- at least one disabled HARQ process may be excluded from determination of the HARQ-ACK codebook.
- the enabled HARQ process may be determined based on control information for disabling at least one HARQ process among a plurality of HARQ processes.
- the enabled HARQ process may include the remaining HARQ processes except for at least one disabled HARQ process based on the control information among the plurality of HARQ processes.
- the UE may ignore the C-DAI value of DCI indicating at least one disabled HARQ process.
- the UE may determine whether to perform HARQ-ACK feedback on the received downlink signal based on the determined HARQ-ACK codebook (S1420).
- a plurality of HARQ processes may be configured for each of the plurality of cells.
- the control information for disabling at least one of the plurality of HARQ processes may be control information for disabling at least one of the plurality of HARQ processes configured for a specific cell.
- the UE may determine the HARQ-ACK codebook except for the corresponding cell. That is, the HARQ-ACK codebook may be determined based on cells in which at least one HARQ process is enabled.
- a HARQ-ACK bit for one downlink signal (eg, PDSCH) is allocated in the corresponding cell, and HARQ- for the enabled HARQ process ACK feedback may be performed.
- a timing offset for performing HARQ-ACK feedback (eg, "PDSCH -to-HARQ feedback timing indicator") can be set.
- the number of HARQ processes may be increased in consideration of a relatively long RTT, and accordingly, the range of the timing offset value may also be extended.
- the range of the timing offset value is extended, a method for indicating the timing offset value of the extended range is needed. The timing offset value is indicated to the UE through a specific field (eg, K1 field) of DCI.
- a value determined based on the resource index may be used.
- a value determined based on the resource index may correspond to the implicit K1 indicator of the above-mentioned proposal 4 (implicit K1 indicator).
- the resource index may include a CCE index in which a PDCCH including DCI is transmitted, a slot index in which the PDCCH is detected, or an RB index in which a PDSCH scheduled by the DCI is transmitted, but is not limited thereto.
- the CCE index in which the PDCCH is transmitted may mean the lowest index or the highest index of the CCE in which the PDCCH is transmitted
- the RB index in which the PDSCH is transmitted may mean the start index of the RB in which the PDSCH is transmitted.
- the present invention is not limited thereto.
- a value determined based on the resource index may be implicitly used as an additionally necessary bit to indicate the timing offset of the extended range.
- a value determined based on the resource index may be '0' in the case of an even slot index and '1' in the case of an odd slot index, but is not limited thereto.
- the proposed embodiments when HARQ-ACK feedback is disabled, unnecessary overhead can be reduced by configuring the HARQ-ACK codebook more efficiently.
- the proposed embodiments when the number of HARQ processes in NTN is increased or the range of timing offset values for performing HARQ-ACK feedback is extended, even if the field size of DCI is not increased, an implicit indication method Through this, the increased number of HARQ processes or a timing offset value may be indicated.
- the above-described proposed method may also be included as one of the implementation methods of the present specification, it is obvious that they may be regarded as a kind of proposed method.
- the above-described proposed methods may be implemented independently, or may be implemented in the form of a combination (or merge) of some of the proposed methods.
- the rule can be defined so that the information on whether the proposed methods are applied (or information on the rules of the proposed methods) is notified by the base station to the terminal through a predefined signal (eg, a physical layer signal or a higher layer signal).
- the upper layer may include, for example, one or more of functional layers such as MAC, RLC, PDCP, RRC, and SDAP.
- Methods, embodiments, or descriptions for implementing the method may be applied separately or one or more methods (or embodiments or descriptions) may be applied in combination.
- FIG. 15 is a flowchart illustrating an operation of transmitting and receiving a UL signal between a base station and a terminal based on the proposed embodiments
- FIG. 16 is a flowchart illustrating an operation of transmitting and receiving a DL signal between a base station and a terminal based on the proposed embodiments to be.
- FIGS. 15 and 16 are only for convenience of description, and the scope of the present specification is not limited by FIGS. 15 and 16 . Some steps shown in FIGS. 15 and 16 may be omitted/merged according to circumstances and/or settings.
- the base station may refer to an object that transmits and receives data to and from the terminal.
- the base station may be a concept including one or more TPs (Transmission Points), one or more TRPs (Transmission and Reception Points), and the like.
- the TP and/or TRP may include a panel of a base station, a transmission and reception unit, and the like.
- TRP is a panel, an antenna array, a cell (eg, macro cell / small cell / pico cell, etc.), TP, base station (base station, gNB, etc.) It can be replaced with an expression such as
- the TRP may be classified according to information (eg, index, ID) on the CORESET group (or CORESET pool).
- information eg, index, ID
- the CORESET group or CORESET pool
- the configuration of the CORESET group (or CORESET pool) may be performed through higher layer signaling (eg, RRC signaling, etc.).
- the default (default) HARQ of the UE in the step before RRC connection / configuration An operation mode may be set. For example, when (the cell accessed by the UE) is indicated to be an NTN cell through PBCH (MIB) or SIB, the UE may recognize that the default mode is set to HARQ-disabled. For example, one of the HARQ-disabled configuration and the HARQ-enabled configuration(s) may be indicated as the basic operation mode through the PBCH (MIB) or the SIB (eg, when indicated by the NTN cell).
- the UE may report capability information of the UE related to the above-described proposal method (eg, proposal 1/ proposal 2/ proposal 3/ proposal 4/ proposal 5, etc.) to the base station.
- the UE capability information may include information on the number of times of repeated reception of a channel (eg, PDSCH) supportable/recommended by the UE/slot aggregation level information/the number of supportable HARQ processes, and the like.
- the capability information of the UE may be reported periodically/semi-persistently/aperiodically.
- the base station may configure/instruct the operations to be described below in consideration of the capabilities of the UE.
- the base station may transmit configuration information to the UE (terminal) (M105). That is, the UE may receive configuration information from the base station.
- the configuration information includes NTN-related configuration information/UL transmission/reception configuration information (eg, PUCCH-) described in the above-mentioned proposed methods (eg, proposal 1 / proposal 2 / proposal 3 / proposal 4 / proposal 5, etc.) config/PUSCH-config)/HARQ process related settings (eg, HARQ feedback enable/disable/the number of HARQ processes, etc.)/CSI report related settings (eg CSI report config/CSI report quantity/CSI-RS resource config etc.) and the like.
- the configuration information may be transmitted through higher layer signaling (RRC or MAC CE).
- whether to enable/disable HARQ feedback may be configured for each cell group.
- the HARQ feedback may be set through information in the form of a bitmap.
- the configuration information may include an aggregation factor/PDSCH repetitive transmission related configuration (eg, the number of repetitions/repetition pattern/repetition step size, etc.).
- the operation of the base station (100/200 in FIG. 18) of the above-described step M105 transmitting configuration information to the UE (100/200 in FIGS. 18 to 20) is performed in the apparatus of FIGS. 18 to 20 to be described below.
- the one or more processors 102 may control one or more transceivers 106 and/or one or more memories 104, etc. to transmit the configuration information
- the one or more transceivers 106 may include:
- the configuration information may be transmitted to the UE.
- the operation of the UE ( 100/200 in FIG. 18 ) of the aforementioned step M105 receiving configuration information from the base station ( 100/200 in FIG. 18 ) may be implemented by the apparatus of FIGS. 18 to 20 to be described below.
- the one or more processors 102 may control one or more transceivers 106 and/or one or more memories 104, etc. to receive the configuration information, and the one or more transceivers 106 may include:
- the configuration information may be received from the base station.
- the base station may transmit configuration information to the UE (M110). That is, the UE may receive configuration information from the base station.
- the configuration information may be transmitted/received through DCI.
- the configuration information includes UL data/channel transmission/reception control information/scheduling information/resource allocation information/HARQ feedback related information (eg, New data indicator (NDI)/Redundancy version)/HARQ number of processes/DAI (Downlink assignment index)/TPC command for scheduled PUCCH/PUCCH resource indicator/PDSCH-to-HARQ_feedback timing indicator) and the like.
- the DCI may be one of DCI format 1_0 or DCI format 1_1.
- whether to enable/disable HARQ feedback may be configured based on the DCI. For example, based on the PDSCH-to-HARQ_feedback timing indicator field/PUCCH resource indicator field of DCI, whether to enable/disable HARQ feedback may be configured.
- the DCI may include an aggregation level (/repetition factor).
- the number of HARQ processes may be set to 16 or more, and based on the HARQ process number field of DCI and the index of CCE / RB associated with the DCI, HARQ process IDs set to 16 or more may be distinguished. have.
- the operation of the base station (100/200 in FIG. 18) of the above-described step M110 transmitting the configuration information to the UE (100/200 in FIG. 18) is implemented by the apparatus of FIGS. 18 to 20 to be described below.
- the one or more processors 102 may control one or more transceivers 106 and/or one or more memories 104, etc. to transmit the configuration information
- the one or more transceivers 106 may include:
- the configuration information may be transmitted to the UE.
- the operation in which the UE (100/200 in FIG. 18) of the aforementioned step M110 receives the configuration information from the base station (100/200 in FIG. 18) is implemented by the apparatus of FIGS. 18 to 20 to be described below.
- the one or more processors 102 may control one or more transceivers 106 and/or one or more memories 104, etc. to receive the configuration information, and the one or more transceivers 106 may include:
- the configuration information may be received from the base station.
- the base station may receive UL data/UL channel (eg, PUCCH/PUSCH) from the UE (M115). That is, the UE may transmit UL data/UL channel to the base station.
- the UL data/UL channel may be received/transmitted based on the aforementioned configuration information/control information.
- the UL data/UL channel may be received/transmitted based on the aforementioned proposed method (eg, proposal 1/ proposal 2/ proposal 3/ proposal 4, etc.).
- CSI reporting may be performed through the UL data/UL channel.
- the CSI report may include transmitting information such as RSRP/CQI/SINR/CRI to the base station.
- the UL data/UL channel may include a request/report of a UE related to HARQ feedback enable/disable.
- the UE enables/disables HARQ feedback based on a report on the increase/decrease of MCS/report on the increase/decrease of transmission of repetition (repetition) of PDSCH Able can be viewed/requested.
- the UL data/UL channel may include HARQ-ACK information.
- a HARQ-ACK codebook (eg, Type 1/2/3) may be configured based on the aforementioned proposal 2 .
- a timing for transmitting HARQ-ACK information may be determined based on the above-mentioned proposal 4 .
- FIGS. 18 to 20 the operation of receiving the UL data/UL channel from the UE ( 100/200 in FIGS. 18 to 20 ) by the base station ( 100/200 in FIG. 18 ) in step M115 is illustrated in FIGS. 18 to 20 , which will be described below. It may be implemented by the device.
- the one or more processors 102 may control one or more transceivers 106 and/or one or more memories 104 , etc. to receive the UL data/UL channel, and the one or more processors.
- the transceiver 106 may receive the UL data/UL channel from the UE.
- FIGS. 18 to 20 the operation in which the UE (100/200 in FIG. 18) in step M115 transmits the UL data/UL channel to the base station (100/200 in FIGS. 18 to 20) is shown in FIGS. 18 to 20, which will be described later. It may be implemented by the device.
- one or more processors 102 may control one or more transceivers 106 and/or one or more memories 104 , etc. to transmit the UL data/UL channel, and the one or more processors.
- the transceiver 106 may transmit the UL data/UL channel to the base station.
- the basic HARQ operation mode of the UE is set in the step before RRC connection / configuration can be For example, when (the cell accessed by the UE) is indicated to be an NTN cell through PBCH (MIB) or SIB, the UE may recognize that the default mode is set to HARQ-disabled.
- the base station may indicate one of the HARQ-disabled configuration and the HARQ-enabled configuration(s) as the basic operation mode through the PBCH (MIB) or the SIB (eg, when indicated by the NTN cell).
- the UE may report capability information of the UE related to the above-mentioned proposal method (eg, proposal 1/ proposal 2/ proposal 3/ proposal 4/ proposal 5, etc.) to the base station.
- the UE capability information may include information on the number of times of repeated reception of a channel (eg, PDSCH) supportable/recommended by the UE/slot aggregation level information/the number of supportable HARQ processes, and the like.
- the UE capability information may be reported periodically/semi-persistently/aperiodically.
- the base station may configure/instruct the operations to be described below in consideration of the capabilities of the UE.
- the base station may transmit configuration information to the UE (terminal) (M205). That is, the UE may receive configuration information from the base station.
- the configuration information is NTN-related configuration information/configuration information for DL transmission and reception (eg, PDCCH-) config/PDSCH-config)/HARQ process-related settings (eg, HARQ feedback enable/disable/number of HARQ processes, etc.)/CSI report-related settings (eg, CSI report config/CSI report quantity/CSI-RS resource config) etc.) and the like.
- the configuration information may be transmitted through higher layer signaling (eg, RRC or MAC CE). For example, whether to enable/disable HARQ feedback may be configured for each cell group.
- whether to enable/disable the HARQ feedback may be set through information in the form of a bitmap.
- the configuration information may include an aggregation factor/PDSCH repetitive transmission related configuration (eg, the number of repetitions/repetition pattern/repetition step size, etc.).
- the configuration information may include a dl-DataToUL-ACK parameter.
- a plurality of integer values from 0 to 31 may be indicated based on the dl-DataToUL-ACK parameter.
- the operation of the base station (100/200 in FIG. 18 ) transmitting the configuration information to the UE ( 100/200 in FIGS. 18 to 20 ) in step M205 described above is the apparatus of FIGS. 18 to 20 to be described later.
- the one or more processors 102 may control one or more transceivers 106 and/or one or more memories 104 , etc. to transmit the configuration information, and the one or more transceivers 106 . ) may transmit the configuration information to the UE.
- step M205 the operation in which the UE (100/200 in FIG. 18) receives the configuration information from the base station (100/200 in FIGS. 18 to 20) is illustrated in FIGS. 18 to 20 to be described below. It may be implemented by the device.
- the one or more processors 102 may control one or more transceivers 106 and/or one or more memories 104 , etc. to receive the configuration information, and the one or more transceivers 106 . ) may receive the configuration information from the base station.
- the base station may transmit control information to the UE (M210). That is, the UE may receive control information from the base station.
- control information may be transmitted/received through DCI.
- the control information includes control information for transmission/reception of DL data/DL channel/scheduling information/resource allocation information/HARQ feedback related information (eg, NDI/RV/HARQ process number/DAI/TPC command for scheduled PUCCH) /PUCCH resource indicator/PDSCH-to-HARQ_feedback timing indicator) and the like.
- the DCI may be one of DCI format 1_0 or DCI format 1_1.
- whether to enable / disable HARQ feedback is set based on the DCI.
- the DCI may include an aggregation level (/repetition factor).
- the number of HARQ processes may be set to 16 or more, and based on the HARQ process number field of DCI and the index of CCE / RB associated with the DCI, HARQ process IDs set to 16 or more may be distinguished. have.
- step M210 an operation in which the base station (100/200 in FIG. 18) transmits control information to the UE (100/200 in FIGS. 18 to 20) is implemented by the apparatus of FIGS. 18 to 20, which will be described later.
- the one or more processors 102 may control one or more transceivers 106 and/or one or more memories 104 , etc. to transmit control information, the one or more transceivers 106 . ) may transmit control information to the UE.
- step M210 the operation of the UE (100/200 in FIG. 18 ) receiving control information from the base station ( 100/200 in FIGS. 18 to 20 ) is performed in the apparatus of FIGS. 18 to 20 to be described later.
- the one or more processors 102 may control one or more transceivers 106 and/or one or more memories 104 , etc. to receive control information, the one or more transceivers 106 , etc. may receive control information from the base station.
- the base station may transmit DL data/DL channel (eg, PDSCH) to the UE (M215). That is, the UE may receive DL data/DL channel from the base station.
- the DL data/DL channel may be transmitted/received based on the above-described configuration information/control information and the like.
- DL data/DL channel may be transmitted/received.
- the DL data/DL channel may be repeatedly transmitted/received (eg, based on slot aggregation).
- the base station (100/200 in FIG. 18) transmits the DL data/DL channel to the UE (100/200 in FIGS. 18 to 20) in FIGS. 18 to 20 to be described below.
- the one or more processors 102 may control one or more transceivers 106 and/or one or more memories 104 , etc. to transmit the DL data/DL channel, and one The above transceiver 106 may transmit the DL data/DL channel to the UE.
- the UE receives the DL data/DL channel from the base station (100/200 in FIGS. 18 to 20) in FIGS. 18 to 20 to be described below.
- the one or more processors 102 may control one or more transceivers 106 and/or one or more memories 104 , etc. to receive the DL data/DL channel, and one The above transceiver 106 may receive the DL data/DL channel from the base station.
- the base station may receive HARQ-ACK feedback from the UE (M220). That is, the UE may transmit HARQ-ACK feedback to the base station.
- HARQ-ACK feedback may be enabled/disabled based on the aforementioned proposal method (eg, proposal 1/ proposal 2/ proposal 3/ proposal 4/ proposal 5, etc.).
- the HARQ-ACK feedback may include ACK/NACK information for DL data/DL channel transmitted from the base station.
- HARQ-ACK feedback may be transmitted through PUCCH and/or PUSCH.
- a HARQ-ACK codebook eg, Type 1/2/3
- a timing for transmitting the HARQ-ACK feedback may be determined.
- the base station receives the HARQ-ACK feedback from the UE (100/200 in FIGS. 18 and 20), which will be described later in FIGS. 18 and 20 .
- the base station receives the HARQ-ACK feedback from the UE (100/200 in FIGS. 18 and 20), which will be described later in FIGS. 18 and 20 .
- It can be implemented by 20 devices.
- one or more processors 102 may control one or more transceivers 106 and/or one or more memories 104 , etc. to receive the HARQ-ACK feedback, the one or more transceivers. 106 may receive the HARQ-ACK feedback from the UE.
- the UE transmits the HARQ-ACK feedback to the base station (100/200 in FIGS. 18 to 20), which will be described later in FIGS. 18 to 20 .
- the one or more processors 102 may control one or more transceivers 106 and/or one or more memories 104 , etc. to transmit the HARQ-ACK feedback, and the one or more transceivers. 106 may transmit the HARQ-ACK feedback to the base station.
- the base station may correspond to a first radio apparatus
- the UE may correspond to a second radio apparatus, and vice versa may be considered in some cases.
- the above-described operation and signaling of the base station/terminal may be processed by one or more processors 102 and 202 of FIGS. 18 to 20 , and the operation and signaling of the above-described base station/terminal are shown in FIGS. 18 and To be stored in a memory (eg, one or more memories 104 , 204 of FIG. 18 ) in the form of instructions/programs (eg, instructions, executable code) for driving at least one processor (eg, 102 , 202 of FIG. 20 ) may be stored in a memory (eg, one or more memories 104 , 204 of FIG. 18 ) in the form of instructions/programs (eg, instructions, executable code) for driving at least one processor (eg, 102 , 202 of FIG. 20 ) may be stored in a memory (eg, one or more memories 104 , 204 of FIG. 18 ) in the form of instructions/programs (eg, instructions, executable code) for driving at least one processor (e
- examples of the above-described proposed method may also be included as one of the implementation methods of the present specification, it is obvious that they may be regarded as a kind of proposed method.
- the above-described proposed methods may be implemented independently, or may be implemented in the form of a combination (or merge) of some of the proposed methods.
- Rules can be defined so that the base station informs the terminal of whether the proposed methods are applied or not (or information about the rules of the proposed methods) through a predefined signal (eg, a physical layer signal or a higher layer signal).
- the upper layer may include, for example, one or more of functional layers such as MAC, RLC, PDCP, RRC, and SDAP.
- Methods, embodiments, or descriptions for implementing the method may be applied separately or one or more methods (or embodiments or descriptions) may be combined and applied.
- FIG. 17 illustrates a communication system 1 applied to the present invention.
- a communication system 1 applied to the present invention includes a wireless device, a base station, and a network.
- the wireless device refers to a device that performs communication using a radio access technology (eg, 5G NR (New RAT), LTE (Long Term Evolution)), and may be referred to as a communication/wireless/5G device.
- the wireless device may include a robot 100a, a vehicle 100b-1, 100b-2, an eXtended Reality (XR) 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 .
- 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 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, and include a Head-Mounted Device (HMD), a Head-Up Display (HUD) provided in a vehicle, a television, a smartphone, It may be implemented in the form of a computer, a wearable device, a home appliance, a digital signage, a vehicle, a robot, and the like.
- the portable device may include a smart phone, a smart pad, a wearable device (eg, a smart watch, smart glasses), a computer (eg, a laptop computer), and the like.
- Home appliances may include a TV, a refrigerator, a washing machine, and the like.
- the IoT device may include a sensor, a smart meter, and the like.
- the base station and the network may be implemented as a wireless device, and the specific wireless device 200a may operate as a base station/network node to other wireless devices.
- the wireless devices 100a to 100f may be connected to the network 300 through the base station 200 .
- AI Artificial Intelligence
- the network 300 may be configured using a 3G network, a 4G (eg, LTE) network, or a 5G (eg, NR) network.
- the wireless devices 100a to 100f may communicate with each other through the base station 200/network 300, but may also communicate directly (e.g. sidelink communication) without passing 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 communicate directly with other IoT devices (eg, sensor) or other wireless devices 100a to 100f.
- Wireless communication/connection 150a, 150b, and 150c may be performed between the wireless devices 100a to 100f/base station 200 and the base station 200/base station 200 .
- the wireless communication/connection includes uplink/downlink communication 150a and sidelink communication 150b (or D2D communication), and communication between base stations 150c (eg relay, IAB (Integrated Access Backhaul)).
- This can be done through technology (eg 5G NR)
- Wireless communication/connection 150a, 150b, 150c allows the wireless device and the base station/radio device, and the base station and the base station to transmit/receive wireless signals to each other.
- the wireless communication/connection 150a, 150b, and 150c may transmit/receive signals through various physical channels.
- various signal processing processes eg, channel encoding/decoding, modulation/demodulation, resource mapping/demapping, etc.
- resource allocation processes etc.
- the first wireless device 100 and the second wireless device 200 may transmit/receive wireless signals through various wireless access technologies (eg, LTE, NR).
- ⁇ first wireless device 100, second wireless device 200 ⁇ is ⁇ wireless device 100x, base station 200 ⁇ of FIG. 26 and/or ⁇ wireless device 100x, wireless device 100x) ⁇ 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 wireless signal including the first information/signal through the transceiver 106 .
- the processor 102 may receive the radio signal including the second information/signal through the transceiver 106 , and then store information obtained from 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 .
- memory 104 may provide instructions for performing some or all of the processes controlled by processor 102 , or for performing descriptions, functions, procedures, suggestions, methods, and/or operational flowcharts disclosed herein. may store software code including
- the processor 102 and the memory 104 may be part of a communication modem/circuit/chip designed to implement a wireless communication technology (eg, LTE, NR).
- a wireless communication technology eg, LTE, NR
- the transceiver 106 may be coupled to the processor 102 , and may transmit and/or receive wireless signals via one or more antennas 108 .
- the transceiver 106 may include a transmitter and/or a receiver.
- the transceiver 106 may be used interchangeably with a radio frequency (RF) unit.
- RF radio frequency
- a wireless device may refer to 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 .
- 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 flow charts disclosed herein.
- the processor 202 may process the 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 radio signal including the fourth information/signal through the transceiver 206 , and then store information obtained from 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 may provide instructions for performing some or all of the processes controlled by the processor 202, or for performing the descriptions, functions, procedures, suggestions, methods, and/or operational flowcharts disclosed herein. may store software code including
- the processor 202 and the memory 204 may be part of a communication modem/circuit/chip designed to implement a wireless communication technology (eg, LTE, NR).
- the transceiver 206 may be coupled to the processor 202 and may transmit and/or receive wireless signals via one or more antennas 208 .
- the transceiver 206 may include a transmitter and/or a receiver.
- the transceiver 206 may be used interchangeably with an RF unit.
- a wireless device may refer to 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).
- the one or more processors 102, 202 are configured to process one or more Protocol Data Units (PDUs) and/or one or more Service Data Units (SDUs) according to the description, function, procedure, proposal, method, and/or operational flowcharts disclosed herein.
- 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, proposal, method, and/or flow charts disclosed herein.
- the one or more processors 102 and 202 generate a signal (eg, a baseband signal) including PDUs, SDUs, messages, control information, data or information according to the functions, procedures, proposals and/or methods disclosed herein. , to one or more transceivers 106 and 206 .
- the one or more processors 102 , 202 may receive signals (eg, baseband signals) from one or more transceivers 106 , 206 , and may be described, functions, procedures, proposals, methods, and/or operational flowcharts disclosed herein.
- PDUs, SDUs, messages, control information, data, or information may be acquired according to the fields.
- One or more processors 102, 202 may be referred to as a controller, microcontroller, microprocessor, or microcomputer.
- One or more processors 102 , 202 may be implemented by hardware, firmware, software, or a combination thereof.
- ASICs Application Specific Integrated Circuits
- DSPs Digital Signal Processors
- DSPDs Digital Signal Processing Devices
- PLDs Programmable Logic Devices
- FPGAs Field Programmable Gate Arrays
- firmware or software may be implemented using firmware or software, and the firmware or software may be implemented to include modules, procedures, functions, and the like.
- the descriptions, functions, procedures, suggestions, methods, and/or flow charts disclosed in this document provide that firmware or software configured to perform is included in one or more processors 102 , 202 , or stored in one or more memories 104 , 204 . It may be driven by the above processors 102 and 202 .
- the descriptions, functions, procedures, proposals, methods, and/or flowcharts of operations disclosed herein may be implemented using firmware or software in the form of code, instructions, and/or a set of instructions.
- One or more memories 104 , 204 may be coupled with one or more processors 102 , 202 , and may store various forms of data, signals, messages, information, programs, code, instructions, and/or instructions.
- the one or more memories 104 and 204 may be comprised of ROM, RAM, EPROM, flash memory, hard drives, registers, cache memory, computer readable storage media, and/or combinations thereof.
- One or more memories 104 , 204 may be located inside and/or external to one or more processors 102 , 202 . Additionally, one or more memories 104 , 204 may be coupled to one or more processors 102 , 202 through various technologies, such as wired or wireless connections.
- One or more transceivers 106 , 206 may transmit user data, control information, radio signals/channels, etc. referred to in the methods and/or operational flowcharts 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. referred to in the descriptions, functions, procedures, suggestions, methods and/or flow charts, etc. 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 may control one or more transceivers 106 , 206 to transmit user data, control information, or wireless 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 wireless signals from one or more other devices.
- one or more transceivers 106, 206 may be coupled to one or more antennas 108, 208, and the one or more transceivers 106, 206 may be coupled via one or more antennas 108, 208 to the descriptions, functions, and functions disclosed herein. , may be set to transmit and receive user data, control information, radio signals/channels, etc.
- 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, 206 convert the received radio signal/channel, etc. from the RF band signal to process the received user data, control information, radio signal/channel, etc. using the one or more processors 102, 202. It can be converted into a baseband signal.
- One or more transceivers 106 , 206 may convert user data, control information, radio signals/channels, etc. processed using one or more processors 102 , 202 from baseband signals to RF band signals.
- one or more transceivers 106 , 206 may include (analog) oscillators and/or filters.
- At least one memory may store instructions or programs, which, when executed, are at least operably coupled to the at least one memory. It may cause one processor to perform operations according to some embodiments or implementations of the present disclosure.
- a computer readable (storage) medium may store at least one instruction or computer program, wherein 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 disclosure.
- a processing device or apparatus may include at least one processor and at least one computer memory connectable to the at least one processor.
- the at least one computer memory may store instructions or programs, which, when executed, cause at least one processor operably coupled to the at least one memory to include several capable of performing operations according to embodiments or implementations.
- FIG 19 shows another example of a wireless device to which the present invention is applied.
- wireless devices 100 and 200 correspond to wireless devices 100 and 200 of FIG. 18 , and include 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 communication circuitry 112 and transceiver(s) 114 .
- communication circuitry 112 may include one or more processors 102 , 202 and/or one or more memories 104 , 204 of FIG. 27 .
- transceiver(s) 114 may include one or more transceivers 106 , 206 and/or one or more antennas 108 , 208 of FIG. 18 .
- the control unit 120 is electrically connected to the communication unit 110 , the memory unit 130 , and the additional element 140 , and controls general 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 .
- control unit 120 transmits information stored in the memory unit 130 to the outside (eg, other communication device) through the communication unit 110 through a wireless/wired interface, or externally (eg, through the communication unit 110 ) Information received through a wireless/wired interface from another communication device) may be stored in the memory unit 130 .
- the additional element 140 may be configured in various ways according to the type of the 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.
- the wireless device includes a robot ( FIGS. 26 and 100a ), a vehicle ( FIGS. 26 , 100b-1 , 100b-2 ), an XR device ( FIGS. 26 and 100c ), a mobile device ( FIGS. 17 and 100d ), and a home appliance. (FIG. 17, 100e), IoT device (FIG.
- digital broadcasting terminal digital broadcasting terminal
- hologram device public safety device
- MTC device medical device
- fintech device or financial device
- security device climate/environment device
- It may be implemented in the form of an AI server/device ( FIGS. 17 and 400 ), a base station ( FIGS. 17 and 200 ), and a network node.
- the wireless device may be mobile or used in a 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 entirely interconnected through a wired interface, or at least some 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 to the communication unit 110 through the communication unit 110 . It can be connected wirelessly.
- each element, component, unit/unit, and/or module within the wireless device 100 , 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 configured as a set of a communication control processor, an application processor, an electronic control unit (ECU), a graphic processing processor, a memory control processor, and the like.
- memory unit 130 may include random access memory (RAM), dynamic RAM (DRAM), read only memory (ROM), flash memory, volatile memory, and non-volatile memory. volatile memory) and/or a combination thereof.
- the wireless communication technology implemented in the wireless devices 100 and 200 of the present specification may include a narrowband Internet of Things for low-power communication as well as LTE, NR, and 6G.
- the NB-IoT technology may be an example of a LPWAN (Low Power Wide Area Network) technology, and may be implemented in standards such as LTE Cat NB1 and/or LTE Cat NB2, and is limited to the above-mentioned name. no.
- the wireless communication technology implemented in the wireless devices 100 and 200 of the present specification may perform communication based on the LTE-M technology.
- the LTE-M technology may be an example of an LPWAN technology, and may be called various names such as enhanced machine type communication (eMTC).
- eMTC enhanced machine type communication
- LTE-M technology is 1) LTE CAT 0, 2) LTE Cat M1, 3) LTE Cat M2, 4) LTE non-BL (non-Bandwidth Limited), 5) LTE-MTC, 6) LTE Machine Type Communication, and/or 7) may be implemented in at least one of various standards such as LTE M, and is not limited to the above-described name.
- the wireless communication technology implemented in the wireless devices 100 and 200 of the present specification is at least one of ZigBee, Bluetooth, and Low Power Wide Area Network (LPWAN) in consideration of low power communication.
- LPWAN Low Power Wide Area Network
- the ZigBee technology can create PAN (personal area networks) related to small/low-power digital communication based on various standards such as IEEE 802.15.4, and can be called by various names.
- the vehicle or autonomous driving vehicle may be implemented as a mobile robot, a vehicle, a train, an aerial vehicle (AV), a ship, and the like.
- AV aerial vehicle
- the vehicle or autonomous driving 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 part 140d.
- the antenna unit 108 may be configured as a part of the communication unit 110 .
- Blocks 110/130/140a-140d correspond to blocks 110/130/140 of FIG. 19, respectively.
- the communication unit 110 may transmit/receive signals (eg, data, control signals, etc.) to and from external devices such as other vehicles, base stations (eg, base stations, roadside units, etc.), servers, and the like.
- the controller 120 may control elements of the vehicle or the autonomous driving vehicle 100 to perform various operations.
- the controller 120 may include an Electronic Control Unit (ECU).
- the driving unit 140a may cause the vehicle or the autonomous driving vehicle 100 to run 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 driving vehicle 100 , and may include a wired/wireless charging circuit, a battery, and the like.
- the sensor unit 140c may obtain vehicle status, surrounding environment information, user information, and the like.
- the sensor unit 140c includes an inertial measurement unit (IMU) sensor, a collision sensor, a wheel sensor, a speed sensor, an inclination sensor, a weight sensor, a heading sensor, a position module, and a vehicle forward movement.
- IMU inertial measurement unit
- a collision sensor a wheel sensor
- a speed sensor a speed sensor
- an inclination sensor a weight sensor
- a heading sensor a position module
- a vehicle forward movement / may include a reverse sensor, a battery sensor, a fuel sensor, a tire sensor, a steering sensor, a temperature sensor, a humidity sensor, an ultrasonic sensor, an illuminance sensor, a pedal position sensor, and the like.
- the autonomous driving unit 140d includes a technology for maintaining a driving lane, a technology for automatically adjusting speed such as adaptive cruise control, a technology for automatically driving along a predetermined route, and a technology for automatically setting a route when a destination is set. technology can be implemented.
- the communication unit 110 may receive map data, traffic information data, and the like from an external server.
- the autonomous driving unit 140d may generate an autonomous driving route and a driving plan based on the acquired data.
- the controller 120 may control the driving unit 140a to move the vehicle or the autonomous driving vehicle 100 along the autonomous driving path (eg, speed/direction adjustment) according to the driving plan.
- the communication unit 110 may obtain the latest traffic information data from an external server non/periodically, 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 driving plan based on the newly acquired data/information.
- the communication unit 110 may transmit information about a vehicle location, an autonomous driving route, a driving plan, and the like to an external server.
- the external server may predict traffic information data in advance using AI technology or the like based on information collected from the vehicle or autonomous driving vehicles, and may provide the predicted traffic information data to the vehicle or autonomous driving vehicles.
- VSAT very-small-aperture terminal
- the VSAT 2120 may refer to an antenna/device capable of bidirectional communication with an antenna (dish) of less than 3 meters.
- the VSAT may be fixedly located on the ground or fixedly mounted on a vehicle/marine vessel.
- NTN may be configured using VSAT.
- the VSAT is configured in the form of a mesh topology (FIG. 21 (a)) or a star topology (FIG. 21 (b)).
- mesh topology each VSAT can be configured in a form that can communicate directly with other VSATs.
- a plurality of VSATs may be connected through a hub, and communication between the VSATs may be performed through the hub.
- VSAT 2120 may operate as an NTN gateway/BS.
- the VSAT 2120 may operate as an IAB node/BS in an IAB link to be described later.
- the NTN gateway 420 may be connected to the satellite 2100
- the satellite 2100 may be connected to the VSAT 2120
- the VSAT 2120 may be connected to the UE to provide a service.
- the VSAT 2120 may communicate with the satellite 430 through IAB-MT, and may service the UE through IAB-DU.
- the satellite 2100 may operate as a parent node.
- the IAB-node may multiplex access and backhaul links in time, frequency and/or space (eg, beam-based operation).
- IAB-node means a RAN node that supports a radio access link for UEs/radio backhaul link for a parent node and a child node.
- IAB-donor is a terminating node (terminating node) of NR backhauling from the network side, providing an interface for accessing the core network to the UE, and providing a wireless backhaul link to the IAB-node RAN node it means.
- a parent node is a next-hop neighbor node of an IAB-node-Mobile Termination (MT), and the parent node may be an IAB-node or an IAB-donor-DU.
- a child node is a next-hop neighbor node of an IAB-node-DU (Distributed Unit), and a child node also corresponds to an IAB-node.
- Upstream refers to the direction of the parent node of the IAB-topology
- Downstream refers to the direction of the child node or UE of the IAB-topology.
- An access link means a link between an access UE and an IAB-node or IAB-donor
- a backhaul link means a link between an IAB-node and an IAB child node or IAB parent node.
- the access link and backhaul link may operate at the same or different frequencies. (in-band and out-of-band relays)
- the IAB can reuse the functions and interfaces previously defined for access.
- the NR Uu interface may be used in the access link, and the aforementioned F1 interface may be extended and applied to the backhaul link.
- the gNB-DU may be interpreted as an IAB-node
- the gNB-CU may be interpreted as an IAB-donor.
- the connection between the UE (/BS) 430 , the satellite 410 , and the gateway 420 may be interpreted as an IAB link of FIG. 22 .
- satellite 410 may operate as an IAB-node
- NTN gateway 420 may operate as a parent node/IAB-donor/child node.
- the BS may operate as an IAB-node
- the satellite 410 may operate as a parent/child node
- the satellite 410 may operate as an IAB-node and the BS may operate as a parent/child node.
- an embodiment of the present invention may be implemented in the form of a module, procedure, function, etc. that perform the functions or operations described above.
- the software code may be stored in the memory unit and driven by the processor.
- the memory unit may be located inside or outside the processor, and may exchange data with the processor by various known means.
- 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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Abstract
Description
SCS (15*2^u) | Nslot symb | Nframe,u slot | Nsubframe,u slot |
15KHz (u=0) | 14 | 10 | 1 |
30KHz (u=1) | 14 | 20 | 2 |
60KHz (u=2) | 14 | 40 | 4 |
120KHz (u=3) | 14 | 80 | 8 |
240KHz (u=4) | 14 | 160 | 16 |
SCS (15*2^u) | Nslot symb | Nframe,u slot | Nsubframe,u slot |
60KHz (u=2) | 12 | 40 | 4 |
Frequency Range designation |
Corresponding frequency range | Subcarrier Spacing |
FR1 | 450MHz - 7125MHz | 15, 30, 60kHz |
FR2 | 24250MHz - 52600MHz | 60, 120, 240kHz |
configuration | HARQ Timing Parameter | Units | 15kHz SCS | 30kHz SCS | 60kHz SCS | 120kHz SCS |
Front-loaded DMRS only |
N1 | Symbols | 8 | 10 | 17 | 20 |
Front-loaded DMRS only+additional DMRS | N1 | Symbols | 13 | 13 | 20 | 24 |
configuration | HARQ Timing Parameter | Units | 15kHz SCS | 30kHz SCS | 60kHz SCS |
Front-loaded DMRS only |
N1 | Symbols | 3 | 4.5 | 9(FR1) |
Front-loaded DMRS only+additional DMRS | N1 | Symbols | [13] | [13] | [20] |
A | B | ||
K0 | DL scheduling DCI | Corresponding DL data transmission | |
K1 | DL data reception | Corresponding HARQ-ACK | |
K2 | UL scheduling DCI | Corresponding UL data transmission |
Platforms | Altitude range | Orbit | Typical beam footprint size |
Low-Earth Orbit (LEO) satellite | 300 - 1500 km | Circular around the earth | 100 - 1000 km |
Medium-Earth Orbit (MEO) satellite | 7000 - 25000 km | 100 - 1000 km | |
Geostationary Earth Orbit (GEO) satellite | 35 786 km | notional station keeping position fixed in terms of elevation/azimuth with respect to a given earth point | 200 - 3500 km |
UAS platform (including HAPS) | 8 - 50 km (20 km for HAPS) | 5 - 200 km | |
High Elliptical Orbit (HEO) satellite |
400 - 50000 km | Elliptical around the earth | 200 - 3500 km |
Transparent satellite | Regenerative satellite | |
GEO based non-terrestrial access network | Scenario A | Scenario B |
LEO based non-terrestrial access network:steerable beams | Scenario C1 | Scenario D1 |
LEO based non-terrestrial access network: the beams move with the satellite |
Scenario C2 | Scenario D2 |
Scenarios | GEO based non-terrestrial access network (Scenario A and B) | LEO based non-terrestrial access network (Scenario C & D) |
Orbit type | notional station keeping position fixed in terms of elevation/azimuth with respect to a given earth point | circular orbiting around the earth |
Altitude | 35,786 km | 600 km1,200 km |
Spectrum (service link) | <6 GHz (e.g. 2 GHz) >6 GHz (e.g. DL 20 GHz, UL 30 GHz) |
|
Max channel bandwidth capability (service link) | 30 MHz for band < 6 GHz1 GHz for band > 6 GHz | |
Payload | Scenario A : Transparent (including radio frequency function only) Scenario B: regenerative (including all or part of RAN functions) |
Scenario C: Transparent (including radio frequency function only) Scenario D: Regenerative (including all or part of RAN functions) |
Inter-Satellite link | No | Scenario C: NoScenario D: Yes/No (Both cases are possible.) |
Earth-fixed beams | Yes | Scenario C1: Yes (steerable beams), see note 1Scenario C2: No (the beams move with the satellite) Scenario D 1: Yes (steerable beams), see note 1 Scenario D 2: No (the beams move with the satellite) |
Max beam foot print size (edge to edge) regardless of the elevation angle | 3500 km (Note 5) | 1000 km |
Min Elevation angle for both sat-gateway and user equipment | 10° for service link and 10° for feeder link | 10° for service link and 10° for feeder link |
Max distance between satellite and user equipment at min elevation angle | 40,581 km | 1,932 km (600 km altitude)3,131 km (1,200 km altitude) |
Max Round Trip Delay (propagation delay only) | Scenario A: 541.46 ms (service and feeder links)Scenario B: 270.73 ms (service link only) | Scenario C: (transparent payload: service and feeder links) - 25.77 ms (600km) - 41.77 ms (1200km) Scenario D: (regenerative payload: service link only) - 12.89 ms (600km) - 20.89 ms (1200km) |
Max differential delay within a cell (Note 6) | 10.3 ms | 3.12 ms and 3.18 ms for respectively 600km and 1200km |
Max Doppler shift (earth fixed user equipment) | 0.93 ppm | 24 ppm (600km)21ppm(1200km) |
Max Doppler shift variation (earth fixed user equipment) | 0.000 045 ppm/s | 0.27ppm/s (600km)0.13ppm/s(1200km) |
User equipment motion on the earth | 1200 km/h (e.g. aircraft) | 500 km/h (e.g. high speed train)Possibly 1200 km/h (e.g. aircraft) |
User equipment antenna types | Omnidirectional antenna (linear polarisation), assuming 0 dBi Directive antenna (up to 60 cm equivalent aperture diameter in circular polarisation) |
|
User equipment Tx power | Omnidirectional antenna: UE power class 3 with up to 200 mWDirective antenna: up to 20 W | |
User equipment Noise figure | Omnidirectional antenna: 7 dBDirective antenna: 1.2 dB | |
Service link | 3GPP defined New Radio | |
Feeder link | 3GPP or non-3GPP defined Radio interface | 3GPP or non-3GPP defined Radio interface |
HARQ process ID (or K1 indicator) |
K1 indicator (or HARQ process ID) |
|
0 (00) | 0 | 0 |
1 (01) | 0 | 1 |
2 (10) | 1 | 0 |
3 (11) | 1 | 1 |
Claims (15)
- 무선 통신 시스템에서 단말이 동작하는 방법에 있어서,복수의 HARQ(Hybrid Automatic Repeat and reQuest) 프로세스 중에서 적어도 하나를 디스에이블(disable)하기 위한 제어 정보를 수신하는 단계;상기 제어 정보에 기반하여, 하향링크 신호를 수신하는 단계; 및상기 제어 정보에 기반하여 결정된 HARQ-ACK(HARQ-ACKnowledgement) 코드북에 기초하여, 상기 하향링크 신호에 대한 HARQ 피드백을 수행할 것인지 여부를 결정하는 단계;를 포함하고,상기 HARQ-ACK 코드북은, 상기 복수의 HARQ 프로세스 중에서 적어도 하나의 인에이블된 HARQ 프로세스에 기반하여 결정되는, 방법.
- 제 1항에 있어서,상기 적어도 하나의 인에이블된 HARQ 프로세스는, 상기 복수의 HARQ 프로세스 중에서, 상기 제어 정보에 기반하여 디스에이블된 적어도 하나의 HARQ 프로세스를 제외한 나머지 HARQ 프로세스를 포함하는, 방법.
- 제 1항에 있어서,상기 복수의 HARQ 프로세스는 상기 단말에게 설정된 복수의 셀 각각을 위해 설정되고,상기 HARQ-ACK 코드북은, 상기 적어도 하나의 인에이블된 HARQ 프로세스를 포함하는 셀에 기반하여 결정되는, 방법.
- 제 1항에 있어서,상기 적어도 하나의 디스에이블된 HARQ 프로세스는, 상기 HARQ-ACK 코드북의 결정 과정에서 제외되는, 방법.
- 제 4항에 있어서,상기 단말은, 상기 적어도 하나의 디스에이블된 HARQ 프로세스를 지시하는 DCI(Donwlink Control Information)의 C-DAI(Counter-Downlink Assignment Inndicator) 값을 무시하는, 방법.
- 제 1항에 있어서,상기 HARQ-ACK 코드북은 Type 1 HARQ-ACK 코드북, Type 2 HARQ-ACK 코드북, 또는 Type 3 HARQ-ACK 코드북을 포함하는, 방법.
- 제 1항에 있어서,상기 HARQ 피드백의 수행을 위한 타이밍 오프셋은, 자원 인덱스에 기반하여 결정된 값 및 DCI(Downlink Control Information) 내에서 고정된 크기를 갖는 특정 필드 값에 기초하여 지시되는, 방법.
- 제 7항에 있어서,상기 자원 인덱스는, PDCCH(Physical Downlink Control Channel) 또는 상기 PDCCH에 의해 스케줄링된 PDSCH(Physical Downlink Shared Channel)가 수신된 슬롯의 특정 인덱스, SFN(System Frame Number), 또는 PDCCH가 수신된 CCE(Control Channel Element)의 인덱스를 포함하는, 방법.
- 제 1항에 있어서,상기 하향링크 신호는, PDCCH(Physical Downlink Control Channel) 및 PDSCH(Physical Downlink Shared Channel) 중 적어도 하나를 포함하는, 방법.
- 제 1항에 있어서,상기 무선 통신 시스템은, NTN(Non-Terrestrial Network)을 포함하는, 방법.
- 무선 통신 시스템에서 동작하는 단말에 있어서,적어도 하나의 RF(Radio Frequency) 유닛;적어도 하나의 프로세서; 및상기 적어도 하나의 프로세서와 동작 가능하게 연결되고, 실행될 때, 상기 적어도 하나의 프로세서가 동작을 수행하도록 하는 적어도 하나의 컴퓨터 메모리를 포함하며, 상기 동작은,복수의 HARQ(Hybrid Automatic Repeat and reQuest) 프로세스 중에서 적어도 하나를 디스에이블(disable)하기 위한 제어 정보를 수신하고,상기 제어 정보에 기반하여, 하향링크 신호를 수신하고,상기 제어 정보에 기반하여 결정된 HARQ-ACK(HARQ-ACKnowledgement) 코드북에 기초하여, 상기 하향링크 신호에 대한 HARQ 피드백을 수행할 것인지 여부를 결정하고,상기 HARQ-ACK 코드북은, 상기 복수의 HARQ 프로세스 중에서 적어도 하나의 인에이블된 HARQ 프로세스에 기반하여 결정되는, 단말.
- 단말을 위한 장치에 있어서,적어도 하나의 프로세서; 및상기 적어도 하나의 프로세서와 동작 가능하게 연결되고, 실행될 때, 상기 적어도 하나의 프로세서가 동작을 수행하도록 하는 적어도 하나의 컴퓨터 메모리를 포함하며, 상기 동작은:복수의 HARQ(Hybrid Automatic Repeat and reQuest) 프로세스 중에서 적어도 하나를 디스에이블(disable)하기 위한 제어 정보를 수신하고,상기 제어 정보에 기반하여, 하향링크 신호를 수신하고,상기 제어 정보에 기반하여 결정된 HARQ-ACK(HARQ-ACKnowledgement) 코드북에 기초하여, 상기 하향링크 신호에 대한 HARQ 피드백을 수행할 것인지 여부를 결정하고,상기 HARQ-ACK 코드북은, 상기 복수의 HARQ 프로세스 중에서 적어도 하나의 인에이블된 HARQ 프로세스에 기반하여 결정되는, 장치.
- 컴퓨터 판독 가능한 저장 매체에 있어서, 실행될 때, 상기 적어도 하나의 프로세서가 동작을 수행하도록 하는 적어도 하나의 컴퓨터 프로그램을 포함하며, 상기 동작은:복수의 HARQ(Hybrid Automatic Repeat and reQuest) 프로세스 중에서 적어도 하나를 디스에이블(disable)하기 위한 제어 정보를 수신하고,상기 제어 정보에 기반하여, 하향링크 신호를 수신하고,상기 제어 정보에 기반하여 결정된 HARQ-ACK(HARQ-ACKnowledgement) 코드북에 기초하여, 상기 하향링크 신호에 대한 HARQ 피드백을 수행할 것인지 여부를 결정하고,상기 HARQ-ACK 코드북은, 상기 복수의 HARQ 프로세스 중에서 적어도 하나의 인에이블된 HARQ 프로세스에 기반하여 결정되는, 컴퓨터 판독 가능한 저장 매체.
- 무선 통신 시스템에서 기지국이 동작하는 방법에 있어서,복수의 HARQ(Hybrid Automatic Repeat and reQuest) 프로세스 중에서 적어도 하나를 디스에이블(disable)하기 위한 제어 정보를 전송하는 단계;상기 제어 정보에 기반하여, 하향링크 신호를 전송하는 단계; 및상기 제어 정보에 기반하여 결정된 HARQ-ACK(HARQ-ACKnowledgement) 코드북에 기초하여, 상기 하향링크 신호에 대한 HARQ 피드백을 수신하는 단계;를 포함하고,상기 HARQ-ACK 코드북은, 상기 복수의 HARQ 프로세스 중에서 적어도 하나의 인에이블된 HARQ 프로세스에 기반하여 결정되는, 방법.
- 무선 통신 시스템에서 동작하는 기지국에 있어서,적어도 하나의 RF(Radio Frequency) 유닛;적어도 하나의 프로세서; 및상기 적어도 하나의 프로세서와 동작 가능하게 연결되고, 실행될 때, 상기 적어도 하나의 프로세서가 동작을 수행하도록 하는 적어도 하나의 컴퓨터 메모리를 포함하며, 상기 동작은,복수의 HARQ(Hybrid Automatic Repeat and reQuest) 프로세스 중에서 적어도 하나를 디스에이블(disable)하기 위한 제어 정보를 전송하고,상기 제어 정보에 기반하여, 하향링크 신호를 전송하고,상기 제어 정보에 기반하여 결정된 HARQ-ACK(HARQ-ACKnowledgement) 코드북에 기초하여, 상기 하향링크 신호에 대한 HARQ 피드백을 수신하는 동작을 포함하고,상기 HARQ-ACK 코드북은, 상기 복수의 HARQ 프로세스 중에서 적어도 하나의 인에이블된 HARQ 프로세스에 기반하여 결정되는, 기지국.
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