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WO2023068801A1 - Procédé de retransmission dans un processus harq dans un système de réseau non terrestre (ntn) - Google Patents

Procédé de retransmission dans un processus harq dans un système de réseau non terrestre (ntn) Download PDF

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Publication number
WO2023068801A1
WO2023068801A1 PCT/KR2022/015947 KR2022015947W WO2023068801A1 WO 2023068801 A1 WO2023068801 A1 WO 2023068801A1 KR 2022015947 W KR2022015947 W KR 2022015947W WO 2023068801 A1 WO2023068801 A1 WO 2023068801A1
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WIPO (PCT)
Prior art keywords
harq
resource
data
harq process
transmission
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English (en)
Korean (ko)
Inventor
이원석
박동현
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Innovative Technology Lab Co Ltd
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Innovative Technology Lab Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/185—Space-based or airborne stations; Stations for satellite systems
    • H04B7/1853—Satellite systems for providing telephony service to a mobile station, i.e. mobile satellite service
    • H04B7/18532—Arrangements for managing transmission, i.e. for transporting data or a signalling message
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/185—Space-based or airborne stations; Stations for satellite systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • 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]
    • 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
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H04L1/188—Time-out mechanisms
    • 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 non-terrestrial network (NTN) and, in detail, can provide a retransmission operating method and system in an HARQ process considering HARQ retransmission disabling/enabling.
  • NTN non-terrestrial network
  • ITU International Telecommunication Union
  • IMT International Mobile Telecommunication
  • 3GPP 3rd Generation Partnership Project
  • NR New Radio
  • NTN non-terrestrial networks
  • TN terrestrial networks
  • the present invention relates to a non-terrestrial network (NTN) and, in detail, can provide a retransmission operating method and system in an HARQ process considering HARQ retransmission disabling/enabling.
  • NTN non-terrestrial network
  • a method for performing HARQ retransmission based on an NTN system may be provided.
  • NTN Non-terrestrial network
  • FIG. 1 is a diagram for explaining an NR frame structure to which the present disclosure may be applied.
  • FIG. 2 is a diagram showing a NR resource structure to which the present disclosure can be applied.
  • FIG. 3 is a diagram illustrating an NTN including a transparent satellite to which the present disclosure can be applied.
  • FIG. 4 is a diagram illustrating an NTN including a playback satellite without Inter-Satellite Links (ISL) to which the present disclosure can be applied.
  • ISL Inter-Satellite Links
  • FIG. 5 is a diagram illustrating an NTN including a reproduction satellite in which an ISL to which the present disclosure can be applied is present.
  • FIG. 6 is a diagram illustrating a user plane (UP) protocol stack structure in NTN including a transparent satellite to which the present disclosure can be applied.
  • UP user plane
  • CP control plane
  • FIG. 8 is a diagram illustrating a timing advance calculation method to which the present disclosure may be applied.
  • FIG. 9 is a diagram illustrating an earth fixed cell scenario to which the present disclosure may be applied.
  • FIG. 10 is a diagram illustrating an earth moving cell scenario to which the present disclosure can be applied.
  • FIG. 11 is a diagram illustrating a method of mapping PCI to satellite beams to which the present disclosure can be applied.
  • FIG. 13 is a diagram showing HARQ state configuration according to an embodiment of the present invention.
  • FIG. 14 is a diagram showing HARQ state configuration according to an embodiment of the present invention.
  • 15 is a diagram illustrating repetition termination according to an embodiment of the present invention.
  • 16 is a diagram illustrating a repeating timer according to an embodiment of the present invention.
  • 17 is a diagram illustrating a repeating timer according to an embodiment of the present invention.
  • first and second are used only for the purpose of distinguishing one element from another, and do not limit the order or importance of elements unless otherwise specified. Accordingly, within the scope of the present disclosure, a first component in one embodiment may be referred to as a second component in another embodiment, and similarly, a second component in one embodiment may be referred to as a first component in another embodiment. can also be called
  • components that are distinguished from each other are intended to clearly explain each characteristic, and do not necessarily mean that the components are separated. That is, a plurality of components may be integrated to form a single hardware or software unit, or a single component may be distributed to form a plurality of hardware or software units. Accordingly, even such integrated or distributed embodiments are included in the scope of the present disclosure, even if not mentioned separately.
  • components described in various embodiments do not necessarily mean essential components, and some may be optional components. Accordingly, an embodiment comprising a subset of elements described in one embodiment is also included in the scope of the present disclosure. In addition, embodiments including other components in addition to the components described in various embodiments are also included in the scope of the present disclosure.
  • the present disclosure describes a wireless communication network, and operations performed in the wireless communication network are performed in the process of controlling the network and transmitting or receiving signals in a system (for example, a base station) that manages the wireless communication network, or It may be performed in a process of transmitting or receiving a signal from a terminal coupled to a wireless network.
  • a system for example, a base station
  • BS Base Station
  • eNB eNodeB
  • gNB gNodeB
  • AP access point
  • UE User Equipment
  • MS Mobile Station
  • MSS Mobile Subscriber Station
  • SS Subscriber Station
  • non-AP STA Non-AP STA
  • transmitting or receiving a channel means transmitting or receiving information or a signal through a corresponding channel.
  • transmitting a control channel means transmitting control information or a signal through the control channel.
  • transmitting a data channel means transmitting data information or a signal through the data channel.
  • NR New Radio
  • the NR system supports various subcarrier spacing (SCS) considering various scenarios, service requirements, and potential system compatibility.
  • SCS subcarrier spacing
  • the NR system uses multiple channels to overcome poor channel environments such as high path-loss, phase-noise, and frequency offset occurring on a high carrier frequency. It is possible to support transmission of a physical signal / channel through a beam of.
  • the NR system can support applications such as eMBB (enhanced mobile broadband), mMTC (massive machine type communications)/uMTC (ultra machine type communications), and URLLC (ultra reliable and low latency communications).
  • 5G mobile communication technology may be defined to include not only the NR system, but also the existing Long Term Evolution-Advanced (LTE-A) system and Long Term Evolution (LTE) system.
  • 5G mobile communication may include a technology that operates in consideration of backward compatibility with the previous system as well as the newly defined NR system. Therefore, the following 5G mobile communication may include a technology operating based on the NR system and a technology operating based on the previous system (e.g., LTE-A, LTE), and is not limited to a specific system.
  • FIG. 1 is a diagram for explaining an NR frame structure to which the present disclosure may be applied.
  • the time structure of a frame for downlink/uplink (DL/UL) transmission is can have
  • one frame It consists of 10 subframes corresponding to time.
  • each frame is divided into two half frames of the same size, half frame 1 may be composed of subframes 0-4, and half frame 2 may be composed of subframes 5-9.
  • TA timing advance
  • DL downlink
  • UL uplink
  • the transmission timing of the uplink transmission frame i is determined based on Equation 1 below based on the downlink reception timing at the terminal.
  • FDD frequency division duplex
  • TDD Time Division Duplex
  • FR1 Frequency Range 1
  • 25600 is 13.030 ⁇ s
  • FR2 Frequency Range 2
  • 13792 is 7.020 ⁇ s.
  • FIG. 2 is a diagram showing a NR resource structure to which the present disclosure can be applied.
  • a resource element (RE) in a resource grid may be indexed according to each subcarrier spacing.
  • one resource grid may be generated for each antenna port and each subcarrier spacing. Uplink and downlink transmission and reception may be performed based on a corresponding resource grid.
  • One resource block (RB) in the frequency domain is composed of 12 REs, and an index (nPRB) for one RB may be configured for each 12 REs.
  • An index for an RB may be utilized within a specific frequency band or system bandwidth.
  • An index for RB may be defined as in Equation 2 below. here, denotes the number of subcarriers per one RB, and k denotes a subcarrier index.
  • Various numerologies can be set to satisfy various services and requirements of the NR system.
  • one subcarrier spacing (SCS) can be supported in an LTE/LTE-A system, but a plurality of SCSs can be supported in an NR system.
  • SCS subcarrier spacing
  • a new numerology for NR systems supporting multiple SCS is 3 GHz or less, 3 GHz-6 GHz to solve the problem of not being able to use a wide bandwidth in a carrier or frequency range such as 700 MHz or 2 GHz. , 6GHZ-52.6GHz or 52.6GHz and above.
  • Table 1 below shows examples of numerologies supported by the NR system.
  • the numerology may be defined based on subcarrier spacing (SCS) used in an orthogonal frequency division multiplexing (OFDM) system, cyclic prefix (CP) length, and the number of OFDM symbols per slot.
  • SCS subcarrier spacing
  • CP cyclic prefix
  • the values may be provided to the UE through higher layer parameters DL-BWP-mu and DL-BWP-cp for downlink and UL-BWP-mu and UL-BWP-cp for uplink. .
  • the subcarrier spacing setting index u is 2
  • the subcarrier spacing ⁇ f is 60 kHz
  • a normal CP and an extended CP may be applied.
  • only normal CP can be applied.
  • a normal slot can be defined as a basic time unit used to transmit basically one piece of data and control information in an NR system.
  • the length of a normal slot can be set to the number of 14 OFDM symbols by default.
  • a subframe has an absolute time length corresponding to 1 ms in the NR system and can be used as a reference time for the length of other time intervals.
  • a time interval such as a subframe of LTE may be required in the NR standard.
  • data may be transmitted based on a transmission time interval (TTI), which is a unit time, and the TTI may be set in units of one or more subframes.
  • TTI transmission time interval
  • one subframe may be set to 1 ms and may include 14 OFDM symbols (or 12 OFDM symbols).
  • non-slots may be defined in NR.
  • a non-slot may mean a slot having a number smaller than that of a normal slot by at least one symbol.
  • the delay time can be reduced through non-slots having a smaller number of symbols than normal slots.
  • the number of OFDM symbols included in the non-slot may be determined in consideration of a frequency range. For example, in a frequency range of 6 GHz or higher, a non-slot having a length of 1 OFDM symbol may be considered.
  • the number of OFDM symbols defining a non-slot may include at least two OFDM symbols.
  • the range of the number of OFDM symbols included in the non-slot may be set as a mini-slot length up to a predetermined length (eg, normal slot length -1).
  • a predetermined length eg, normal slot length -1
  • the number of OFDM symbols may be limited to 2, 4 or 7 symbols, but is not limited thereto.
  • subcarrier spacings corresponding to u equal to 1 and 2 are used in unlicensed bands below 6 GHz, and subcarrier spacings corresponding to u equal to 3 and 4 may be used in unlicensed bands exceeding 6 GHz.
  • u when u is 4, it may be used for SSB (Synchronization Signal Block).
  • Table 2 shows the number of OFDM symbols per slot in the case of a normal CP for each subcarrier spacing setting (u) ( ), the number of slots per frame ( ), the number of slots per subframe ( ). Table 2 shows the above-described values based on a normal slot having 14 OFDM symbols.
  • Table 3 shows the number of slots per frame and the number of slots per subframe based on the normal slot where the number of OFDM symbols per slot is 12 when the extended CP is applied (ie, when u is 2 and the subcarrier spacing is 60 kHz). represents the number of
  • one subframe may correspond to 1 ms on the time axis.
  • one slot may correspond to 14 symbols on the time axis.
  • one slot may correspond to 7 symbols on the time axis. Accordingly, the number of slots and symbols that can be considered can be set differently within 10 ms corresponding to one radio frame.
  • Table 4 may indicate the number of slots and symbols according to each SCS. In Table 4, SCS of 480 kHz may not be considered, but is not limited to these examples.
  • communication may be performed based on a terrestrial network composed of terminals located on the ground and base stations located on the ground.
  • the terminal may access the network through wireless.
  • the terminal may be provided with the same service continuously through other base stations in the terrestrial network.
  • the terminal was able to access a specific service server through other wired or Internet networks.
  • the terminal could be provided with a service for connecting wired or wireless communication with other terminals through the network.
  • NTN non-terrestrial network
  • LEO Low Earth Orbit
  • GEO Geostationary Earth Orbit
  • UAS unmanned aircraft system
  • NTN terrestrial networks
  • NTN and TN are distinguished and described as a communication system capable of communication between terminals based on NTN, and a method of supporting communication service between terminals based thereon is described.
  • a wireless communication service between a terrestrial base station and a wireless terminal or between a mobile base station is described as a mobile service, but is not limited thereto.
  • communication between the mobile terrestrial base stations and one or more space base stations may be a mobile satellite service.
  • a wireless communication service between mobile terrestrial base stations and space base stations or between mobile terrestrial base stations through at least one space base station may also be a mobile satellite service, but is not limited thereto.
  • NTN network-to-media access technology
  • technologies for NTN have been introduced to be specialized for satellite communication, but NTN can also be introduced in TN's communication system (e.g. 5G system) to operate like TN.
  • the UE can simultaneously support NTN and TN.
  • the wireless communication system may require specific technologies for NTN in addition to long-term evolution (LTE) and new radio (NR) systems, which are radio access technology (RAT), for a terminal that supports both NTN and TN at the same time.
  • LTE long-term evolution
  • NR new radio
  • RAT radio access technology
  • NTN Non-terrestrial networks
  • an NTN gateway located on the surface of the earth and equipped with sufficient radio access equipment to access satellites.
  • an NTN gateway may be a transport network layer node (TNL).
  • TNL transport network layer node
  • Geostationary Earth orbit (GEO):
  • LEO Low Earth Orbit
  • MEO Medium Earth Orbit
  • UAS Unmanned Aircraft Systems
  • the unmanned aerial vehicle system may include at least one of a Tethered UAS (TUA), a Lighter Than Air UAS (LTA), and a Heavier Than Air UAS (HTA) system.
  • TAA Tethered UAS
  • LTA Lighter Than Air UAS
  • HTA Heavier Than Air UAS
  • It may be a wireless communication service between mobile terrestrial base stations and one or more space base stations, or between mobile terrestrial base stations and space base stations, or between mobile terrestrial base stations via one or more space base stations.
  • Non-Geostationary Satellites
  • Satellites in LEO and MEO orbits may be satellites orbiting the Earth with a period of between about 1.5 and 10 hours.
  • It may mean changing the carrier frequency of an uplink RF signal and filtering and amplifying it before transmitting it through downlink.
  • Signal transformation may include digital processing such as decoding, demodulation, re-modulation, re-encoding, and filtering.
  • NTN gNB On board NTN gNB:
  • It may refer to an on-board satellite in which a base station (gNB) is implemented in a regenerative payload structure.
  • gNB base station
  • NTN gNB On ground NTN gNB:
  • a terrestrial base station implemented with a base station (gNB) in a transparent payload structure
  • the time required to reach a wireless terminal from a wireless terminal to a public data network or from a public data network to a wireless terminal in a wireless communication system is not limited.
  • RTD Round Trip Delay
  • the returned signal may be a signal including a different form or message from the above arbitrary signal.
  • It may be a mobile vehicle in space equipped with a wireless communication transceiver capable of supporting a transparent payload or a regenerative payload, and may be generally located on LEO, MEO, or GEO orbits.
  • FIG. 3 is a diagram illustrating an NTN including a transparent satellite to which the present disclosure can be applied.
  • a terminal included in the NTN may include a terrestrial network terminal.
  • NTN and TN terminals may include manned or unmanned vehicles such as ships, trains, buses, or airplanes, and may not be limited to a specific form.
  • a transparent satellite payload generated through a network including transparent satellites may be implemented in a manner corresponding to an RF repeater.
  • a network including transparent satellites may perform frequency conversion and amplification of radio signals received in all directions of uplink and downlink, and transmit the radio signals. Accordingly, the satellite may perform a function of relaying the NR-Uu air interface including both the feeder link and the service link, and the NR-Uu air interface will be described later.
  • a satellite radio interface (SRI) on a feeder link may be included in an NR-Uu interface. That is, the satellite may not be the end of the NR-Uu interface.
  • the NTN gateway can support all functions required to deliver signals defined in the NR-Uu interface.
  • different transparent satellites may be connected to the same base station on the ground. That is, a configuration in which a plurality of transparent satellites are connected to one terrestrial base station may be possible.
  • the base station may be an eNB or a gNB, but may not be limited to a specific form.
  • FIG. 4 is a diagram illustrating an NTN including a playback satellite without Inter-Satellite Links (ISL) to which the present disclosure can be applied.
  • ISL Inter-Satellite Links
  • NTN may include playback satellites.
  • the reproduction satellite may mean that a base station function is included in the satellite.
  • a reproduction satellite payload generated through a network including reproduction satellites may be implemented by regenerating a signal received from the ground.
  • the playback satellite may receive a signal from the ground based on an NR-Uu air interface on a service link between the terminal and the satellite.
  • the reproduction satellite may receive a signal from the ground through a satellite radio interface (SRI) on a feeder link between NTN gateways.
  • SRI Satellite Radio Interface
  • a transport layer may mean a transport layer among layers defined as OSI 7 layers. That is, a signal from the ground based on a reproduction satellite may be transformed based on digital processes such as decoding, demodulation, re-modulation, re-encoding and filtering, but not limited thereto.
  • FIG. 5 is a diagram illustrating an NTN including a reproduction satellite in which an ISL to which the present disclosure can be applied is present.
  • ISL may be defined in the transport layer.
  • the ISL may be defined as a radio interface or a visible light interface, and is not limited to a specific embodiment.
  • the NTN gateway can support all functions of the transport protocol.
  • each playback satellite can be a base station, and multiple playback satellites can be connected to the same 5G core network on the ground.
  • FIG. 6 is a diagram illustrating a user plane (UP) protocol stack structure in NTN including a transparent satellite to which the present disclosure can be applied.
  • 7 is a diagram illustrating a control plane (CP) protocol stack structure in NTN including a transparent satellite to which the present disclosure can be applied.
  • UP user plane
  • CP control plane
  • the NR Uu interface may be an interface defined by protocols for wireless access between a terminal and a base station in the NR system.
  • the NR Uu interface may include a user plane defined by protocols for user data transmission including NTN.
  • the NR Uu interface may include a control plane defined by protocols for transmitting signaling including RRC information including NTN.
  • the Medium Access Control (MAC) layer includes Radio Link Control (RLC), Packet Data Convergence Protocol (PDCP), and Service Data Adaptation Protocol (SDAP). ) and Radio Resource Control (RRC), and the protocol for each layer may be defined based on NR among 3GPP RAN-related standards, but may not be limited thereto.
  • FIG. 6 may be a UP protocol stack structure based on a transparent satellite. That is, in the satellite and NTN gateways, only frequency conversion and amplification of the radio signal received transparently can be performed and transmitted.
  • FIG. 7 may be a CP protocol stack structure based on a transparent satellite. That is, in the satellite and NTN gateways, only frequency conversion and amplification of radio signals received transparently can be performed.
  • the roundtrip time (RTT) between the terminal and the base station may be greater in the NTN than in the existing TN. Accordingly, the UE needs to store data to be transmitted through each of uplink and downlink in a buffer for a longer period of time due to an increase in RTT from a UP point of view. That is, the terminal needs to store more data in the buffer. Accordingly, the terminal may require a memory having a larger capacity than before, which will be described later.
  • NTN signal round-trip time
  • FIG. 8 may be a method of calculating a TA value generated according to a satellite payload type.
  • FIG. 8(a) may be a method of calculating a TA value when a satellite payload type is a reproduced payload.
  • FIG. 8(b) may be a method of calculating a TA value when a satellite payload type is a transparent payload.
  • a case in which the terminal knows the satellite ephemeris and the location of the terminal may be considered for initial access and continuous maintenance of a timing advance (TA) value.
  • the satellite ephemeris may mean a distance between each satellite and a receiver and position information of each satellite.
  • the UE can acquire and apply the TA value by itself. (Option 1 below).
  • the UE can receive instructions for TA compensation and correction from the network. (Option 2 below)
  • the satellite may directly serve as a base station.
  • the UE may calculate a TA value required for uplink transmission including a physical random access channel (PRACH).
  • the UE may calculate a common TA value (Tcom) and a TA value (TUEx) for each UE.
  • the common TA value (Tcom) may be a TA value required for all terminals occurring with large cell coverage of NTN and long round trip time (RTT).
  • the NTN since the NTN is located in the sky and has a relatively longer distance than the distance between terminals, a common TA value (Tcom) considering a long round-trip time (RTT) in cell coverage may be required.
  • the TA value (TUEx) for each UE may be a value generated due to different locations of each UE within cell coverage. If the terminal pre-stored or received the ephemeris from the NTN to determine the position of the satellite at a specific time and knows the location of the corresponding terminal through a function such as GNSS, the terminal can locate the satellite at a specific time Since the distance between the terminal and the terminal can be calculated, the TA value can be corrected after acquiring the TA value by itself, and the TA value can be determined through this.
  • the UE can perform uplink timing alignment between UEs received from the base station with full TA compensation.
  • the terminal may perform downlink and uplink frame timing alignment at the network side.
  • the satellite payload type is the transparent payload
  • the satellite performs filtering and amplification of the radio signal and transmits the signal to the NTN gateway. That is, the satellite can operate like an RF repeater.
  • the common TA value Tcom may be determined based on the sum of the distance D01 between the reference point and the satellite and the distance D02 between the satellite and the NTN gateway.
  • the feeder link may be changed according to the change of the NTN gateway based on the movement of the satellite.
  • the distance between the satellite and the NTN gateway may be changed based on the changed feeder link. Therefore, the generated common TA value may be changed, and there is a need for updating in the corresponding terminal.
  • an offset is set between downlink frame timing and uplink frame timing in a network
  • the UE can calculate only different TA values (TUEx) for each UE, the UE needs to check one reference point for each beam or cell, and transmits information about this to other UEs. There is a need.
  • the network When an offset is set between downlink frame timing and uplink frame timing in a network, the network needs to manage offset information regardless of a satellite payload type.
  • the network may provide a value for TA correction to each terminal, and is not limited to the above-described embodiment.
  • a method for instructing TA compensation and correction in the network may be considered.
  • a common TA value may be generated based on common elements of propagation delay shared by all terminals located within the satellite beam or cell coverage.
  • the network may transmit a common TA value to UEs for each beam or cell of each satellite based on a broadcast method.
  • the common TA value may be calculated in the network assuming at least one reference location for each beam or cell of each satellite.
  • the TA value (TUEx) for each UE may be determined based on a random access procedure defined in the existing communication system (eg, Release 15 or Release 16 of the existing NR system).
  • a new field may be required for the random access message.
  • the UE may support TA value correction based on the timing change rate.
  • FIG. 9 is a diagram illustrating an earth fixed cell scenario to which the present disclosure may be applied.
  • a fixed cell may be a cell in which a signal transmission location from a satellite is fixed.
  • a fixed cell can be maintained only when a service coverage is fixed to a specific location by changing an antenna and a beam.
  • satellite 1 910 in FIG. 9 may maintain a fixed cell while changing an antenna and a beam during T1 to T3.
  • T4 a specific time
  • the beam or cell of satellite 2 (920) serving the same position as the position serviced by satellite 1 (910) at the previous time (T1 to T3) is the beam or cell of satellite 1 (910).
  • characteristics can be maintained, and is not limited to the above-described embodiment.
  • PCI physical cell ID
  • system information may remain the same. That is, as a cell with fixed service coverage, it can be set based on satellites whose antenna and beam angle can be varied among satellites on LEO and MEO orbits, except for GEO.
  • FIG. 10 is a diagram illustrating an earth moving cell scenario to which the present disclosure can be applied.
  • a cell in which service coverage moves may be an earth moving cell.
  • satellite 1 (1010), satellite 2 (1020), and satellite 3 (1030) may provide services to respective cells having different PCIs.
  • an antenna and a beam through which the satellite transmits a signal to the ground are fixed, and a form in which service coverage moves as the satellite moves over time may be referred to as an earth moving cell.
  • the terrestrial mobile cell may be set based on satellites having fixed antenna and beam angles among satellites on LEO and MEO orbits, except for GEO.
  • the corresponding satellites may have advantages of low cost and low failure rate compared to satellites capable of adjusting the angle of an antenna and a beam.
  • FIG. 11 is a diagram illustrating a method of mapping PCI to satellite beams to which the present disclosure can be applied.
  • PCI may refer to an index capable of logically distinguishing one cell. That is, beams having the same PCI value may be included in the same cell.
  • PCI may be allocated to several satellite beams.
  • one PCI may be assigned to each satellite beam in one satellite.
  • a satellite beam may be composed of one or more SSB (Synchronization Signal Block, SS/PBCH block) beams.
  • SSB Synchronization Signal Block
  • One cell may consist of up to L SSB beams.
  • L may be 4, 8, 64, or 256 according to the size of the frequency band and/or subcarrier band, but is not limited to the above-described embodiment.
  • SSB indexes may be used for each PCI.
  • SSBs transmitted through different beams can be distinguished, and an SSB index can be mapped with a logically defined antenna port or a physically separated beam.
  • a terminal capable of accessing NTN may be a terminal supporting a Global Navigation Satellite System (GNSS) function.
  • GNSS Global Navigation Satellite System
  • terminals capable of accessing NTN may include terminals that do not support GNSS.
  • the NTN can also support a terminal that supports a GNSS function but cannot secure location information through GNSS, and is not limited to the above-described embodiment.
  • the terminal may perform communication through NTN.
  • a terminal may receive a 5G/B5G NTN-based non-terrestrial network-based service.
  • the terminal can escape from regional, environmental, spatial and economic constraints on wireless access services (e.g., LTE, NR, WiFi, etc.) based on ground network equipment installation.
  • wireless access services e.g., LTE, NR, WiFi, etc.
  • an advanced radio access technology provided on a terrestrial network may be applicable to non-terrestrial network platforms (e.g., satellites and UAVs).
  • non-terrestrial network platforms e.g., satellites and UAVs.
  • various radio access service products and technologies can be provided together with advanced network technologies.
  • the NTN platform can be operated as a kind of mirror by installing a function of relaying NR signals in space or at high altitudes or a function of a base station (gNB, eNB).
  • gNB base station
  • eNB base station
  • the NG-RAN based NTN architecture can be implemented with "Transparent payload-based NTN” and "Regenerative payload-based NTN” structures, which are as described above.
  • NTN technology can be used for wider coverage and more radio access services as an extended network structure and technology of 5G IAB (Integrate Access and Backhaul) architecture. Integration of NTN and terrestrial networks can ensure service continuity and scalability of 5G systems.
  • 5G IAB Intelligentgrate Access and Backhaul
  • NTN and TN convergence networks can provide significant gains in terms of 5G target performance (e.g., user experience data rate and reliability) in urban and suburban areas.
  • NTN and TN convergence networks can ensure connectivity not only in very dense areas (e.g., concert halls, sports stadiums, shopping centers, etc.) but also in fast-moving objects such as airplanes, bullet trains, vehicles and ships. there is.
  • the NTN and TN integrated networks can simultaneously use data transmission services from the NTN network and the TN network through a multi-connection function. At this time, it is possible to obtain both the efficiency and economy of 5G wireless transmission service by selectively utilizing a better network according to the characteristics of traffic and the degree of loading of traffic.
  • Terminals located on plain land can use wireless data services by simultaneously connecting the NTN network and the TN network.
  • the terminal can connect to one or more NTN platforms (e.g., two or more LEO/GEO satellites) at the same time to provide wireless data access service for poor environments or regions that are difficult to support in the TN network.
  • NTN platforms e.g., two or more LEO/GEO satellites
  • the terminal can be utilized in association with various services.
  • the integrated NTN network and TN network can improve the reliability of autonomous driving service and perform efficient network operation, and are not limited to the above-described embodiment.
  • the V2X technology based on LTE mobile communication or the standard technology based on the IEEE 802.11p standard may have similar limits on services that can be provided.
  • the LTE V2X standard can be provided to meet the requirements defined on C-ITS (e.g., time delay of about 100ms, reliability of about 90%, and messages of tens to hundreds of bytes in size generated about 10 times per second, etc.). Therefore, a new V2X service may be required that requires low latency, high reliability, high volume data traffic, and improved positioning.
  • standardization of 5G radio access technology e.g., New Radio (NR)
  • NR New Radio
  • the NTN network may be used to support IoT services for poor environments and areas not covered by terrestrial networks.
  • IoT equipment may frequently need to perform wireless communication with minimal power consumption in a poor channel environment (e.g., mountain, desert, or sea) according to the purpose of use.
  • Cellular-based technologies proposed in the past may be mainly aimed at Mobile Broadband (MBB) services. Therefore, efficiency may be low to provide IoT service in terms of radio resource utilization and power control, and flexible operation may not be supported.
  • MBB Mobile Broadband
  • efficiency may be low to provide IoT service in terms of radio resource utilization and power control, and flexible operation may not be supported.
  • MBB Mobile Broadband
  • the NTN network can be applied, and service can be improved through this.
  • 5G mobile communication-based sidelink technology is applied through the NTN network, it is possible to provide users with wider coverage and mobility with a more efficient wireless communication method than current Bluetooth/Wi-Fi-based wearable equipment. .
  • it can be differentiated from existing communication standards in applications (e.g. wearable multimedia service) that require high data transmission rates and mobility support using wearable devices.
  • the high-reliability and low-latency technology of the 5G mobile communication system through the NTN network can provide public services such as disaster response.
  • mobile broadband service can be supported even in deserts or high mountains by using a mobile base station such as a drone supporting 5G mobile communication. That is, when the NTN network is applied to public services, disaster communication coverage can be expanded by covering various regions.
  • FIG. 12 is a diagram showing a HARQ process configuration according to an embodiment of the present invention.
  • configuredGrantTimer is a timer introduced to prevent HARQ process retransmission in Configured Grant Type 1/Type 2.
  • the UE derives the HARQ process number to be used for each CG resource through Equation 1 or Equation 2, and can perform PUSCH transmission when there is a TB to transmit.
  • configuredGrantTimer is operated for HARQ Process num#X.
  • the terminal may ignore the corresponding HARQ Process#X Grant in the CG while the configuredGrantTimer is running.
  • HARQ Process ID [floor(CURRENT_symbol/periodicity)] modulo nrofHARQ - Processes
  • HARQ Process ID [floor(CURRENT_symbol/periodicity)]modulo nrofHARQ - Processes+ h arqProc - Offset2
  • ConfiguredGrantConfig If harqProc-Offset2 is configured within, HARQ PID is larger than harqProc-Offset2 and smaller than harqProc-Offset2+nrofHARQ-Processes.
  • the base station shows a configuration when the number of UL HARQ processes is set to 16, harqProc-Offset2 is set to 13, and the number of HARQ processes (nrofHARQ-Processes) to be used for UL CG is set to 3.
  • HARQ retransmission method of DG dynamic grant
  • the network can be configured with RRC for each HARQ process in consideration of delay/reliability.
  • HARQ Process#X set with HARQ State A needs to start drx-HARQ-RTT-TimeUL to perform an operation for receiving a retransmission grant, and HARQ Process#X set with HARQ State B does not expect retransmission. Therefore, drx-HARQ-RTT-TimerUL may not start.
  • the above operation is an optional network setting method, and some of the multiple HARQ processes may be set and some may not be set.
  • FIG. 13 and 14 are diagrams illustrating HARQ state configurations according to an embodiment of the present invention.
  • FIGS. 13 and 14 an example in which a plurality of HARQ processes are set in various forms according to data QoS characteristics (delay/reliability) is shown in the NTN network.
  • the HARQ Process State that can be set by the network is not limited to the above example, and HARQ State A/B can be set for discontinuous HARQ processes.
  • the CGT of the HARQ Process ID to be used in order to transmit a new CG, the CGT of the HARQ Process ID to be used must not operate in order to transmit the UL Grant to the HARQ Entity.
  • the DCI of the third condition may be Activation/Deactivation CG Type 2 or DG. This does not include Type 1 CG.
  • the TS 38.214 specification specifies the conditions for stopping CG repetitive transmission
  • the TS 38.321 specification specifies the terminal operation when CG resources overlap with other CG resources
  • CG retransmission repetition transmission, CS-RNTI Scheduling
  • HARQ State A/B can be set for each HARQ process, and drx-HARQ-RTT-TimerUL operation is determined. That is, HARQ State B, which does not expect retransmission, should not perform CGT operation. Therefore, it is ideal that the operation of the CGT should not operate in HARQ State B, and UE operation is required for this.
  • HARQ State B in which drx-HARQ-RTT-TimerUL and CGT operations are not expected because retransmission is not expected, is set.
  • HARQ State A if the CGT operation is followed according to the existing operation, no problem occurs.
  • the terminal operation for comparing the priorities of two grants with different HARQ Process IDs is as follows.
  • TS 38.321 above is a method for determining the priority of an uplink grant, and when lch-basedPrioritization is configured, the highest priority among LCHs in which data that can be multiplexed in the MAC PDU exists is determined as the priority of the uplink grant. If there is no data to be transmitted, the priority of the uplink grant is set lower than the priority of the uplink grant that can transmit data.
  • An uplink grant with a higher priority is determined as a prioritized uplink grant, and other overlapping uplink grants are determined as de-prioritized uplink grants.
  • a retransmission-based repetition uplink grant may be determined as a prioritized uplink grant and an overlapping CG PUSCH uplink grant having the same HARQ Process ID may be determined as a de-prioritized uplink grant or vice versa.
  • a HARQ entity can receive more than one Uplink grant for the same resource, and cannot receive more than one Uplink grant for the same HARQ Process ID due to CGT operation in the existing operation.
  • transmission is performed for the prioritized uplink grant, and the de-prioritized uplink grant is ignored.
  • UE Operation 1 When a retransmission-based repetition uplink grant is determined as a de-prioritized uplink grant and an overlapped CG PUSCH uplink grant having the same HARQ Process ID is determined as a prioritized uplink grant
  • the MAC PDU is received and the repetition uplink grant is ignored.
  • a retransmission-based repetition uplink grant is determined as a prioritized uplink grant and an overlapped CG PUSCH uplink grant having the same HARQ Process ID is determined as a de-prioritized uplink grant
  • the HARQ buffer of the HARQ process is flushed. Therefore, the repetition uplink grant determined as the prioritized uplink grant causes a problem because the HARQ buffer is empty.
  • the MAC PDU can be obtained from the multiplexing and assembly entity and used for transmission, but the previously transmitted TB may remain in the HARQ buffer.
  • the repetitions shall be terminated after transmitting K repetitions, or at the last transmission occasion among the K repetitions within the period P, or from the starting symbol of the repetition that overlaps with a PUSCH with the same HARQ process scheduled by DCI format 0_0, 0_1, 0_2 or semi-statically configured by higher layer parameter configuredGrantConfig whichever is reached first.
  • 15 is a diagram illustrating repeated transmission according to an embodiment of the present invention.
  • 510 is a repetitive transmission resource determined after the first transmission in CG resources
  • 520 means a resource position of CG Configuration #1
  • 530 means a resource position of CG Configuration #2.
  • the UE may determine HARQ Process ID 1 in resource 540, CG Configuration#1, and perform initial transmission of TB A. Subsequent repetitive transmissions may be performed as many as parameters set by RRC. 550 may be the last repetitive transmission of the initial transmission transmitted in the last 540, and a situation may arise where HARQ Process ID#1 is determined overlapping with the PUSCH resource of CG Configuration#2. In this case, the terminal stops the repetitive transmission determined in step 540. After that, in 550, a new TB may be transmitted through HARQ Process ID#1.
  • the above operation is a specification operation on whether to transfer the UL grant to the HARQ entity when receiving the UL grant from the MAC entity.
  • the above operation can be performed on CG resources set at specific intervals. After determining the HARQ process ID to be used in the CG resource, checking whether the CGT of the corresponding HARQ process is operating, toggling NDI for new transmission, HARQ information is displayed. Delivered to HARQ Entity.
  • the terminal prevents reuse of the specific HARQ Process ID#X by operating the Repetition Timer or drx-retransmissionTimerUL including or until repeated transmission after the initial transmission for the specific HARQ Process ID#X.
  • 16 is a diagram illustrating a repeating timer according to an embodiment of the present invention. 16 shows an example for Case 2). 610 is a repetitive transmission resource determined after the first transmission in CG resources, 620 means the resource position of CG Configuration #1, and 630 means the resource position of CG Configuration #2.
  • the terminal may determine HARQ Process ID#1 in 640, CG Configuration#1 resource, and perform initial transmission of TB#A. Subsequent repetitive transmissions may be performed as many as parameters set by RRC. 650 may be the last repetitive transmission of the initial transmission transmitted in 640, and a situation may arise where HARQ Process ID#1 is determined overlapping with PUSCH resources of CG Configuration#2. In this case, after initial transmission to TB#A in 640, the UE operates 660 RepetitionTimer or drx-retransmissionTimerUL to prevent reuse of HARQ Process ID#1.
  • the name of the timer is not limited thereto, and is a timer used to retransmit the TB used for initial transmission.
  • the terminal may perform retransmission through repetitive transmission of TB#A through HARQ Process ID#1 in 650 . And, even if HARQ Process ID#1 is determined in 650 CG Configuration#2, since RepetitionTimer or drx-retransmissionTimerUL is operating in the corresponding HARQ Process ID, the MAC Entity ignores the configured uplink grant or does not transmit it to the HARQ Entity.
  • 17 is a diagram illustrating a repeating timer according to an embodiment of the present invention.
  • 710 is a repetitive transmission resource determined after the first transmission in DG resources
  • 720 means a resource position of a dynamic uplink grant
  • 730 means a resource position of CG configuration.
  • the UE may determine HARQ Process ID#1 (HARQ PID#1) indicated by DCI in the dynamic uplink grant resource and perform initial transmission of TB#A. If HARQ Process ID#1 is set to use for CG and HARQ State B, CGT is not operated and RepetitionTimer or drx-retransmissionTimerUL is operated as in 760 to perform retransmission based on repetitive transmission. Subsequent repetitive transmissions may be performed as many as parameters set by RRC. 750 may be the last repetitive transmission of the initial transmission transmitted in 740, and a situation may occur where HARQ Process ID#1 is determined overlapping with the PUSCH resource of CG Configuration.
  • new transmission could not be performed on 750 CG PUSCH resources due to the operation of CGT, but as described above, since it may be desirable not to perform the operation of CGT in NTN HARQ State B, based on 760 RepetitionTimer and drx-retransmissionTimerUL
  • the terminal determines whether to perform new transmission. For example, when initial transmission is performed using HARQ Process ID#X in which HARQ State B is set in 740 Dynamic uplink grant, RepetitionTimer and drx-retransmissionTimerUL are operated.
  • the UE may determine HARQ Process ID#X in the 750 CG PUSCH resource, and at this time, since RepetitionTimer and drx-retransmissionTimerUL are operating, the MAC Entity in the 750 CG PUSCH resource ignores the configured uplink grant or does not transmit to the HARQ Entity.
  • the problem can be solved by flushing the HARQ buffer only when the HARQ process corresponding to the de-prioritized uplink grant is HARQ State B.
  • the above example does not limit the content of the invention, and when an uplink grant having the same HARQ Process ID in overlapping PUSCH resources is delivered to a HARQ entity, the following operations are included to handle the HARQ Buffer operation of the same HARQ Process ID. . “If a new transmission uplink grant is de-prioritized to perform a repeated transmission uplink grant, the HARQ Buffer of the HARQ Process is not emptied” or “If a repeated transmission uplink grant is de-prioritized to perform a new transmission uplink grant, HARQ Process After emptying the HARQ Buffer, get the MAC PDU from Multiplexing and assembly Entity”

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • General Physics & Mathematics (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Selon un mode de réalisation, la présente invention concerne un procédé permettant d'effectuer une retransmission HARQ sur la base d'un système NTN, qui effectue une retransmission sur la base d'un processus HARQ. Le procédé selon la présente invention comprend les étapes consistant à : recevoir des informations de configuration d'autorisation configurée (CG) provenant d'une station de base, des informations pour au moins une CG et une transmission répétitive à l'intérieur de ladite CG étant configurées dans un terminal sur la base d'un NTN ; et mettre en œuvre, sur la base des informations de configuration de CG, une transmission initiale de premières données par l'intermédiaire d'un premier ID de processus HARQ dans une ressource d'une configuration CG, une transmission répétitive des premières données étant effectuée, sur la base des informations de configuration de CG, dans une ressource de transmission répétitive configurée après la transmission initiale.
PCT/KR2022/015947 2021-10-21 2022-10-19 Procédé de retransmission dans un processus harq dans un système de réseau non terrestre (ntn) Ceased WO2023068801A1 (fr)

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