WO2023068801A1 - Method for retransmission in harq process in non-terrestrial network (ntn) system - Google Patents

Abstract

According to an embodiment of the present invention, provided may be a method for performing HARQ retransmission on the basis of an NTN system, which performs retransmission on the basis of an HARQ process. The method according to the present invention comprises the steps of: receiving configured grant (CG) configuration information from a base station, information for at least one CG and repetitive transmission within the at least one CG being configured in a terminal on the basis of an NTN; and performing, on the basis of the CG configuration information, an initial transmission of first data via a first HARQ process ID in a resource of a CG configuration, repetitive transmission of the first data being performed, on the basis of the CG configuration information, in a repetitive transmission resource configured after the initial transmission.

Description

Retransmission method of HARQ process in NTN (NON-TERRESTRIAL NETWORK) system

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.

The International Telecommunication Union (ITU) is developing IMT (International Mobile Telecommunication) frameworks and standards, and recently, discussions for 5G communication are underway through a program called "IMT for 2020 and beyond" .

In order to meet the requirements presented by "IMT for 2020 and beyond", the 3rd Generation Partnership Project (3GPP) NR (New Radio) system considers various scenarios, service requirements, potential system compatibility, etc. It is being discussed in the direction of supporting various numerologies on a resource unit basis.

In addition, in the new communication system, mobile terminals (e.g. vehicle / train / ship type terminal / personal smartphone) using non-terrestrial networks (NTN) as well as terrestrial networks (TN) A discussion on how to support seamless communication service at the service level is underway, and the following describes a method of seamlessly providing service to terminals in a state where the NTN and terrestrial network service ranges overlap.

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.

In a method for performing HARQ retransmission based on an NTN system according to an embodiment of the present invention, a method for performing retransmission based on an HARQ process may be provided.

According to an embodiment of the present invention, it is related to NTN (Non-terrestrial network), and in detail, there is an effect of providing a retransmission operation method and system in an HARQ process considering HARQ retransmission disabling/enabling.

1 is a diagram for explaining an NR frame structure to which the present disclosure may be applied.

2 is a diagram showing a NR resource structure to which the present disclosure can be applied.

3 is a diagram illustrating an NTN including a transparent satellite to which the present disclosure can be applied.

4 is a diagram illustrating an NTN including a playback satellite without Inter-Satellite Links (ISL) to which the present disclosure can be applied.

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.

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.

8 is a diagram illustrating a timing advance calculation method to which the present disclosure may be applied.

9 is a diagram illustrating an earth fixed cell scenario to which the present disclosure may be applied.

10 is a diagram illustrating an earth moving cell scenario to which the present disclosure can be applied.

11 is a diagram illustrating a method of mapping PCI to satellite beams to which the present disclosure can be applied.

13 is a diagram showing HARQ state configuration according to an embodiment of the present invention.

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.

Hereinafter, with reference to the accompanying drawings, embodiments of the present disclosure will be described in detail so that those skilled in the art can easily implement the present disclosure. However, this disclosure may be embodied in many different forms and is not limited to the embodiments set forth herein.

In describing the embodiments of the present disclosure, if it is determined that a detailed description of a known configuration or function may obscure the gist of the present disclosure, a detailed description thereof will be omitted. And, in the drawings, parts irrelevant to the description of the present disclosure are omitted, and similar reference numerals are assigned to similar parts.

In the present disclosure, when a component is said to be "connected", "coupled" or "connected" to another component, this is not only a direct connection relationship, but also an indirect connection relationship where another component exists in the middle. may also be included. In addition, when a component "includes" or "has" another component, this means that it may further include another component without excluding other components unless otherwise stated. .

In the present disclosure, terms such as 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

In the present disclosure, 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.

In the present disclosure, 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.

It is obvious that various operations performed for communication with a terminal in a network composed of a plurality of network nodes including a base station may be performed by the base station or other network nodes other than the base station. 'Base Station (BS)' may be replaced by terms such as fixed station, Node B, eNodeB (eNB), ng-eNB, gNodeB (gNB), and access point (AP). . In addition, 'terminal' will be replaced with terms such as User Equipment (UE), Mobile Station (MS), Mobile Subscriber Station (MSS), Subscriber Station (SS), and non-AP STA. can

In the present disclosure, transmitting or receiving a channel means transmitting or receiving information or a signal through a corresponding channel. For example, transmitting a control channel means transmitting control information or a signal through the control channel. Similarly, transmitting a data channel means transmitting data information or a signal through the data channel.

In the following description, the term NR (New Radio) system is used for the purpose of distinguishing a system to which various examples of the present disclosure are applied from an existing system, but the scope of the present disclosure is not limited by these terms. .

The NR system supports various subcarrier spacing (SCS) considering various scenarios, service requirements, and potential system compatibility. In addition, 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. Through this, 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).

Hereinafter, 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.

First, the physical resource structure of the NR system to which the present invention is applied will be briefly described.

1 is a diagram for explaining an NR frame structure to which the present disclosure may be applied.

The basic unit of the time domain in NR is

can be,

, and may be N = 4096. On the other hand, in LTE, the time domain basic unit is

can be,

ego,

=2048. The constant for the multiple relationship between the NR time base unit and the LTE time base unit is k=

can be defined as

Referring to FIG. 1, the time structure of a frame for downlink/uplink (DL/UL) transmission is

can have Here, one frame

It consists of 10 subframes corresponding to time. The number of consecutive OFDM symbols per subframe is

=

can be In addition, 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.

represents a timing advance (TA) between downlink (DL) and uplink (UL). Here, 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.

[Equation 1]

here,

may be a TA offset value generated by a duplex mode difference or the like. In frequency division duplex (FDD)

has a value of 0, but in TDD (Time Division Duplex), considering the margin for DL-UL switching time

can be defined as a fixed value of For example, in Time Division Duplex (TDD) of Frequency Range 1 (FR1), which is a sub-6 GHz frequency

is 39936

or 25600

can be 39936

is 20.327 μs, 25600

is 13.030 μs. In addition, in the mmWave frequency FR2 (Frequency Range 2)

is 13792

can be At this time, 13792

is 7.020 μs.

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. Here, 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.

[Equation 2]

Various numerologies can be set to satisfy various services and requirements of the NR system. For example, 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.

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.

[Table 1]

Referring to Table 1, 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. 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. .

In Table 1, when the subcarrier spacing setting index u is 2, the subcarrier spacing Δf is 60 kHz, and a normal CP and an extended CP may be applied. In the case of other numerology indexes, 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. In addition, unlike a slot, 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. Here, for coexistence or backward compatibility between the LTE system and the NR system, a time interval such as a subframe of LTE may be required in the NR standard.

For example, in LTE, 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. Here, one subframe may be set to 1 ms and may include 14 OFDM symbols (or 12 OFDM symbols).

Also, 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. For example, in the case of providing a low delay time such as URLLC service, the delay time can be reduced through non-slots having a smaller number of symbols than normal slots. Here, 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. As a further example, the number of OFDM symbols defining a non-slot may include at least two OFDM symbols. Here, 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). However, as a non-slot standard, the number of OFDM symbols may be limited to 2, 4 or 7 symbols, but is not limited thereto.

In addition, for example, 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. For example, when u is 4, it may be used for SSB (Synchronization Signal Block).

[Table 2]

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]

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

As described above, one subframe may correspond to 1 ms on the time axis. Also, one slot may correspond to 14 symbols on the time axis. For example, 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.

[Table 4]

Also, for example, in an existing wireless communication system, 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. Here, when the terminal moves, the terminal may be provided with the same service continuously through other base stations in the terrestrial network. After accessing the network, the terminal was able to access a specific service server through other wired or Internet networks. In addition, the terminal could be provided with a service for connecting wired or wireless communication with other terminals through the network.

However, in a new wireless communication system, communication of a terminal may be supported through not only a terrestrial network but also a non-terrestrial network (NTN). Here, NTN may refer to a network or part of a network using a mobile body floating in the air or space equipped with a base station or relay equipment. For example, the NTN may support a communication service between terminals based on satellites equipped with communication functions on Low Earth Orbit (LEO) and Geostationary Earth Orbit (GEO). As another example, the NTN may support a communication service between terminals based on an aircraft equipped with a communication function in an unmanned aircraft system (UAS), but is not limited thereto.

In the following, terrestrial networks (TN) are distinguished and described in contrast to non-terrestrial networks (NTN). That is, since only terrestrial networks exist in existing communication systems, they cannot be distinguished. On the other hand, in the following, 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.

For example, 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. Also, communication between the mobile terrestrial base stations and one or more space base stations may be a mobile satellite service. In addition, 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.

In the following, a method of performing communication based on a wireless communication system supporting both a mobile service and a mobile satellite service will be described. For example, 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. Here, 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. , a method for this is described below. As an example, the following may be definitions for each term in relation to NTN and TN.

Non-terrestrial networks (NTN):

A network or part of a network using a mobile vehicle in the air or in space equipped with a base station or relay equipment for communication.

NTN-gateway:

A terrestrial base station or gateway located on the surface of the earth and equipped with sufficient radio access equipment to access satellites. In general, an NTN gateway may be a transport network layer node (TNL).

Feeder link:

Radio link between NTN gateway and satellite

Geostationary Earth orbit (GEO):

A circular orbit 35,786 km above the Earth's equator that coincides with the direction of Earth's rotation. Objects or satellites in the orbit orbit at the same period as the Earth's rotation period. Therefore, when observed from Earth, it appears to exist in a fixed position without movement.

Low Earth Orbit (LEO):

Orbits between 300 km and 1500 km above

Medium Earth Orbit (MEO):

Orbits existing between LEO and GEO

Unmanned Aircraft Systems (UAS):

A system that typically operates at 8 km to 50 km above ground and may include High Altitude Platforms (HAPs). 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.

Minimum Elevation angle:

The minimum angle required for a ground terminal to face a satellite or UAS base station in the air

Mobile Services:

Wireless communication service between terrestrial base stations and wireless terminals or between mobile base stations

Mobile Satellite Services:

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.

On Board processing:

Digital processing of uplink RF signals mounted on satellites or non-terrestrial equipment

Transparent payload:

It may mean changing the carrier frequency of an uplink RF signal and filtering and amplifying it before transmitting it through downlink.

Regenerative payload:

Transformation and amplification of uplink RF signals before transmission through downlink. Signal transformation may include digital processing such as decoding, demodulation, re-modulation, re-encoding, and filtering.

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.

On ground NTN gNB:

A terrestrial base station implemented with a base station (gNB) in a transparent payload structure

One-way latency:

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.

Round Trip Delay (RTD):

It can be the time when any signal travels from the wireless terminal to the NTN-gateway or from the NTN-gateway to the wireless terminal and back again. At this time, the returned signal may be a signal including a different form or message from the above arbitrary signal.

Satellite:

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.

Satellite beam:

The beam produced by the onboard satellite's antenna

Service link:

Radio link between satellite and terminal (UE)

User Connectivity:

Ability to establish and maintain data/voice/video transmission between network and terminal

User Throughput:

Data transmission rate provided to the terminal

3 is a diagram illustrating an NTN including a transparent satellite to which the present disclosure can be applied.

Referring to FIG. 3, a terminal included in the NTN may include a terrestrial network terminal. For example, 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. Referring to FIG. 3 , a transparent satellite payload generated through a network including transparent satellites may be implemented in a manner corresponding to an RF repeater.

More specifically, 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.

As another example, referring to FIG. 3 , 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. Here, the NTN gateway can support all functions required to deliver signals defined in the NR-Uu interface. For example, 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.

4 is a diagram illustrating an NTN including a playback satellite without Inter-Satellite Links (ISL) to which the present disclosure can be applied.

Referring to FIG. 4, NTN may include playback satellites. Here, the reproduction satellite may mean that a base station function is included in the satellite. For example, a reproduction satellite payload generated through a network including reproduction satellites may be implemented by regenerating a signal received from the ground.

More specifically, 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. As another example, the reproduction satellite may receive a signal from the ground through a satellite radio interface (SRI) on a feeder link between NTN gateways. Here, Satellite Radio Interface (SRI) may be defined in a transport layer between a satellite and an NTN gateway. 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.

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.

Referring to FIG. 5, ISL may be defined in the transport layer. As another example, the ISL may be defined as a radio interface or a visible light interface, and is not limited to a specific embodiment. Here, the NTN gateway can support all functions of the transport protocol. In addition, each playback satellite can be a base station, and multiple playback satellites can be connected to the same 5G core network on the ground.

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.

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. In this case, the NR Uu interface may include a user plane defined by protocols for user data transmission including NTN. In addition, the NR Uu interface may include a control plane defined by protocols for transmitting signaling including RRC information including NTN. For example, 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.

As an example, 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. Also, 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.

Based on the foregoing, it is possible to consider a wireless communication system supporting terminal-to-device communication with NTN and TN. Here, as an example, 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.

8 is a diagram illustrating a timing advance calculation method to which the present disclosure may be applied. As described above, since satellites included in NTN are located in the sky, signal round-trip time (RTT) may be long. For example, in the case of LEO, it exists at an altitude of 300 km to 1200 km, and in the case of GEO, it may be located at 36,000 km or more above the equator. Therefore, in NTN, propagation delay can be very large compared to TN. On the other hand, since NTN is located in the sky, cell coverage may be greater than that of terrestrial networks.

That is, since the NTN may have different RTT and cell coverage compared to the TN, there is a need to newly define a method for obtaining time synchronization for uplink transmission in the NTN. As an example, FIG. 8 may be a method of calculating a TA value generated according to a satellite payload type.

More specifically, FIG. 8(a) may be a method of calculating a TA value when a satellite payload type is a reproduced payload. Also, FIG. 8(b) may be a method of calculating a TA value when a satellite payload type is a transparent payload.

Here, 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. Here, the satellite ephemeris may mean a distance between each satellite and a receiver and position information of each satellite. As an example, the UE can acquire and apply the TA value by itself. (Option 1 below). As another example, the UE can receive instructions for TA compensation and correction from the network. (Option 2 below)

For example, referring to FIG. 8(a) , when the satellite payload type is a replay payload, the satellite may directly serve as a base station. At this time, 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. As an example, 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). That is, 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. Also, 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.

Through the above, the UE can perform uplink timing alignment between UEs received from the base station with full TA compensation.

As another example, the terminal may perform downlink and uplink frame timing alignment at the network side. As shown in FIG. 8( b ), when 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. At this time, a case may occur in which the NTN gateway needs to be changed based on the continuous movement of the satellite. In FIG. 8(b), 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. In this case, the feeder link may be changed according to the change of the NTN gateway based on the movement of the satellite. That is, 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. In addition, when an offset is set between downlink frame timing and uplink frame timing in a network, there is a need to additionally consider a case in which a TA value generated by feeder link is not corrected by the entire TA compensation method. In addition, when 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. 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. Here, as an example, the network may provide a value for TA correction to each terminal, and is not limited to the above-described embodiment.

As another example, a method for instructing TA compensation and correction in the network (option 2) may be considered. In this case, 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. In addition, 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). In this case, for example, when a long TA value and a negative TA value are applied, a new field may be required for the random access message. For example, when a timing change rate is provided to a UE by a network, the UE may support TA value correction based on the timing change rate.

9 is a diagram illustrating an earth fixed cell scenario to which the present disclosure may be applied.

Referring to FIG. 9 , a fixed cell may be a cell in which a signal transmission location from a satellite is fixed. For example, since a satellite moves according to time, a fixed cell can be maintained only when a service coverage is fixed to a specific location by changing an antenna and a beam. In this case, for example, satellite 1 910 in FIG. 9 may maintain a fixed cell while changing an antenna and a beam during T1 to T3. Here, when a specific time (T4) elapses, since satellite 1 can no longer service the corresponding location, satellite 2 920 provides service at the corresponding location, thereby maintaining service continuity. At this time, after time T4, 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.

As a more specific example, when services are provided to satellite 1 910 and satellite 2 920, at least one of a physical cell ID (PCI) value and 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.

On the other hand, FIG. 10 is a diagram illustrating an earth moving cell scenario to which the present disclosure can be applied. For example, a cell in which service coverage moves may be an earth moving cell.

For example, referring to FIG. 10 , satellite 1 (1010), satellite 2 (1020), and satellite 3 (1030) may provide services to respective cells having different PCIs. In this case, 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. Here, 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.

11 is a diagram illustrating a method of mapping PCI to satellite beams to which the present disclosure can be applied.

For example, 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. For example, referring to FIG. 11(a), PCI may be allocated to several satellite beams. On the other hand, referring to FIG. 11(b), one PCI may be assigned to each satellite beam in one satellite. For example, a satellite beam may be composed of one or more SSB (Synchronization Signal Block, SS/PBCH block) beams. One cell (or PCI) may consist of up to L SSB beams. Here, 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. That is, in L, similar to a terrestrial network (TN), which is an existing communication system (NR system), one or several SSB indexes may be used for each PCI. Through this, 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.

For example, a terminal capable of accessing NTN may be a terminal supporting a Global Navigation Satellite System (GNSS) function. However, terminals capable of accessing NTN may include terminals that do not support GNSS. As another example, 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.

As described above, the terminal may perform communication through NTN. For example, a terminal may receive a 5G/B5G NTN-based non-terrestrial network-based service. Through this, 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. For example, based on the above, an advanced radio access technology provided on a terrestrial network may be applicable to non-terrestrial network platforms (e.g., satellites and UAVs). Through this, 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). As an example, the NG-RAN based NTN architecture, as already mentioned, can be implemented with "Transparent payload-based NTN" and "Regenerative payload-based NTN" structures, which are as described above.

In addition, as an example, 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.

As a specific example, 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. As another example, 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. As another example, 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. In addition, 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. Through this, the terminal can be utilized in association with various services. In particular, 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.

Here, as an example, 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. At this time, as an example, standardization of 5G radio access technology (e.g., New Radio (NR)) is in progress based on the above. In addition, as an example, standardization of various numerologies, frame structures, and corresponding L2/L3 protocol structures is in progress so that requirements of new services can be more flexibly met than LTE. Based on the above, it is possible to support enhanced V2X services such as autonomous driving or remote driving by introducing sidelink wireless access technology based on 5G mobile communication technology, and for this purpose, the NTN network can be utilized.

As another example, the NTN network may be used to support IoT services for poor environments and areas not covered by terrestrial networks. For example, 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. Also, for example, in the case of non-cellular based existing IoT technology, there may be limitations in providing various IoT services due to limited mobility support and coverage. Considering the above points, the NTN network can be applied, and service can be improved through this.

In addition, as an example, if 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. . In addition, 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.

As another example, it is possible to improve the public safety communication network and expand disaster communication coverage through the NTN network. For example, 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. For example, 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.

12 is a diagram showing a HARQ process configuration according to an embodiment of the present invention.

Configured Grant (CG), HARQ Process configuredGrantTimer

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. Here, after performing PUSCH transmission, 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.

[Equation 1]

HARQ Process ID = [floor(CURRENT_symbol/periodicity)] modulo nrofHARQ - Processes

[Equation 2]

HARQ Process ID = [floor(CURRENT_symbol/periodicity)]modulo nrofHARQ - Processes+ h arqProc - Offset2

Here, ConfiguredGrantConfig. If harqProc-Offset2 is configured within, HARQ PID is larger than harqProc-Offset2 and smaller than harqProc-Offset2+nrofHARQ-Processes.

For example, in FIG. 12, 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 State A/B

So far, the HARQ retransmission method of DG (dynamic grant) has been discussed and agreed upon. For HARQ States A and B, it is defined that the network can be configured with RRC for each HARQ process in consideration of delay/reliability.

- HARQ State A: In case of retransmission, the HARQ process that operates drx-HARQ-RTT-TimerUL is mapped to an LCH that requires high reliability. The difference from the existing operation is UE-gNB RTT offset in drx-HARQ-RTT-TimerUL Operate by adding as much as

- HARQ State B: When there is no retransmission, drx-HARQ-RTT-TimerUL does not operate, mapping to LCH that requires low reliability and low delay

That is, it means that the network sets the HARQ retransmission method for each HARQ process, and it means that the operation may vary depending on the HARQ State A / B. Therefore, 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.

13 and 14 are diagrams illustrating HARQ state configurations according to an embodiment of the present invention.

Referring to 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.

- Example 1: HARQ State A/B is not set for all HARQ processes (following the existing behavior)

- Example 2: HARQ State A/B is set for some continuous HARQ processes

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.

It was agreed to configure a plurality of configured grants (CGs) to increase scheduling efficiency, that is, to reduce scheduling delay in the NTN characteristic with long propagation delay. Therefore, it is necessary to consider the introduction of the HARQ retransmission method for DG to the CG environment.

Repetition based CG retransmission

As in TS 38.321, 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.

In repeated transmission and retransmission by CS-RNTI, it is determined whether to perform retransmission by checking whether they overlap with PUSCH resources by DCI or resources used in the random access procedure.

As in TS 38.314, there are three cases where CG Repetition ends.

- In case K repeated transmission is performed

- In the case of the last transmission opportunity among K repetitive transmissions during P period

- When PUSCH resources of DCI format 0_0, 0_1, 0_2 with the same HARQ process number overlap

The DCI of the third condition may be Activation/Deactivation CG Type 2 or DG. This does not include Type 1 CG.

Summarizing the above, the TS 38.214 specification specifies the conditions for stopping CG repetitive transmission, and the TS 38.321 specification specifies the terminal operation when CG resources overlap with other CG resources, and CG retransmission (repetitive transmission, CS-RNTI Scheduling) Specifies the terminal operation when resources overlap with other resources.

In an NTN environment where HARQ Retransmission Enable/Disable is set, 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.

The above-mentioned problem may occur in the HARQ Process in which HARQ State B, in which drx-HARQ-RTT-TimerUL and CGT operations are not expected because retransmission is not expected, is set. In 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. For example, 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. In addition, for other HARQ Process IDs, when one or more Uplink grants are received, 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

In order to perform new transmission with the overlapped CG PUSCH uplink grant according to the above specification operation, the MAC PDU is received and the repetition uplink grant is ignored.

UE operation 2) When 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

Since the overlapped CG PUSCH uplink grant 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.

In the case of terminal operation 1), since the HARQ buffer is not flushed, 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.

In the case of terminal operation 2), since the HARQ buffer can be flushed, there is a problem that there is no TB to be used for retransmission.

The case of overlapping resources and HARQ process numbers by CG repetitive transmission and DCI is solved by the method specified in TS 38.214. Therefore, in this document, if CG repetitive transmission resources using HARQ Process with HARQ State B, in which CGT and drx-HRAQ-RTT-TimerUL do not operate, overlap with other Type 1 CG resources using the same HARQ Process ID, Method for terminating repetition (Case 1) Repetition timer, operation of transmitting repetition UL grant to HARQ entity through drx-retransmissionTimerUL and not transmitting configured uplink grant to HARQ entity (Case 2), HARQ for de-prioritized uplink grant Change the buffer behavior (Case 3) or try to explain it.

Problem Solution: Additional Repetition Priorities behavior & repetition timer & repetition termination

Case 1) Repetition termination

TS 38.214;

For any RV sequence, 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.

Example)

15 is a diagram illustrating repeated transmission according to an embodiment of the present invention.

15 shows an example for Case 1). 510 is a repetitive transmission resource determined after the first transmission in CG resources, 520 means a resource position of CG Configuration # 1, and 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.

Case 2) Repetition Timer, drx-retransmissionTimerUL

If the repetitive transmission resource of CG#1 for which HARQ Process#X with HARQ State B is set overlaps CG#2 for which HARQ Process#X is determined, CG# through Repetition Timer and drx-retransmissionTimerUL operations after the first transmission of CG#1 Block new transmission of 2.

spec operation)

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. In the past, 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.

Here, since the CGT operation may not be performed in consideration of NTN HARQ State B, overlap using the same HARQ process may occur. Accordingly, 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.

Example)

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. Here, the name of the timer is not limited thereto, and is a timer used to retransmit the TB used for initial transmission. In addition, this can have the effect of preventing the use of the same HARQ process in other PUSCH resources. Accordingly, 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.

17 shows an example for Case 2). 710 is a repetitive transmission resource determined after the first transmission in DG resources, 720 means a resource position of a dynamic uplink grant, and 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. In the past, 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.

Case 3) HARQ buffer operation change for de-prioritized uplink grant

If Repetition termination and Repetition Timer in Cases 1 and 2) are not introduced, two grants for the same HARQ Process ID can come down to the HARQ Entity. Therefore, in this case, priorities are compared to determine which grant will be handled by the HARQ Entity.

Case 3-1) When the retransmission-based repetition uplink grant is determined as a de-prioritized uplink grant and the overlapping CG PUSCH uplink grant with the same HARQ Process ID is determined as a prioritized uplink grant

For Case 3-1), since the overlapped CG PUSCH uplink grant is determined as a prioritized uplink grant, MAC PDUs for retransmission stored in the HARQ buffer are flushed, and then MAC PDUs to be newly transmitted are received from the multiplexing and assembly entity.

Case 3-2) When the retransmission-based repetition uplink grant is determined as a prioritized uplink grant and the overlapped CG PUSCH uplink grant with the same HARQ Process ID is determined as a de-prioritized uplink grant

Since the repetition uplink grant was determined to be a prioritized uplink grant for Case 3-2), 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”

The above can be applied to various systems.

Claims (12)

1. In a method for a terminal to perform hybrid automatic repeat request (HARQ) retransmission based on a non-terrestrial network (NTN) in a wireless communication system,

   Receiving configured grant (CG) configuration information from a base station, wherein the terminal is configured with at least one CG and information for repeated transmission in the at least one CG based on the NTN;

   Performing initial transmission of first data with a first HARQ process ID in a resource of CG configuration based on the CG configuration information, wherein the first data is initially transmitted based on the CG configuration information A terminal operating method for performing repetitive transmission in a repetitive transmission resource set thereafter.
2. According to claim 1,

   Performing initial transmission of the first data to the first HARQ process ID in a resource of a first CG configuration based on the CG configuration information, wherein the first data is based on the CG configuration information and is repeatedly transmitted in repeated transmission resources set after the initial transmission; and

   And determining data to be transmitted when the set repeated transmission resource overlaps with a resource of a second CG configuration for transmission of second data with the first HARQ process ID.
3. According to claim 2,

   When the set repeated transmission resource overlaps with the resource of the second CG configuration, the terminal stops the repeated transmission in the overlapped resource and transmits the second data with the first HARQ process ID , Terminal operation method.
4. According to claim 2,

   When the set repeated transmission resource overlaps with the resource of the second CG configuration, the terminal transmits the first data in the overlapped resource based on a first timer,

   A plurality of HARQ processes are configured in the terminal, and an HARQ state is set in at least one HARQ process among the plurality of HARQ processes,

   When the HARQ state is set in the HARQ process corresponding to the first HARQ process ID and is in the first HARQ state, the first timer operates after the first transmission of the first data.
5. According to claim 4,

   The HARQ process in the first HARQ state does not perform retransmission and does not operate a timer for retransmission,

   The second HARQ state, the HARQ process, performs retransmission and operates a timer for the retransmission.
6. According to claim 2,

   When the set repeated transmission resource overlaps with the resource of the second CG configuration, the terminal determines data to be transmitted in the overlapped resource based on the priorities of the first data and the second data. .
7. In a terminal performing hybrid automatic repeat request (HARQ) retransmission based on non-terrestrial networks (NTN) in a wireless communication system,

   transceiver;

   a processor connected to the transceiver;

   the processor,

   Control the transceiver to receive configured grant (CG) configuration information configured from a base station, but in the terminal, at least one or more CGs and information for repeated transmission in the at least one or more CGs are configured based on the NTN,

   Based on the CG configuration information, control the transceiver to perform initial transmission of first data with a first HARQ process ID in a resource of CG configuration, wherein the first data is based on the CG configuration information A terminal that performs repetitive transmission in repetitive transmission resources set after the initial transmission.
8. According to claim 7,

   the processor,

   Based on the CG configuration information, the transceiver is controlled to perform initial transmission of the first data to the first HARQ process ID in a resource of a first CG configuration, wherein the first data is the CG configuration. Based on the information, it is repeatedly transmitted in a set repeated transmission resource even after the first transmission, and

   When the set repeated transmission resource overlaps with the resource of the second CG configuration for transmission of the second data with the first HARQ process ID, determining data to be transmitted.
9. According to claim 8,

   When the set repeated transmission resource overlaps with the resource of the second CG configuration, the terminal stops the repeated transmission in the overlapped resource and transmits the second data with the first HARQ process ID , terminal.
10. According to claim 8,

    When the set repeated transmission resource overlaps with the resource of the second CG configuration, the terminal transmits the first data in the overlapped resource based on a first timer,

    A plurality of HARQ processes are configured in the terminal, and an HARQ state is set in at least one HARQ process among the plurality of HARQ processes,

    When the HARQ state is set in the HARQ process corresponding to the first HARQ process ID and is in the first HARQ state, the first timer operates after the first transmission of the first data.
11. According to claim 10,

    The HARQ process in the first HARQ state does not perform retransmission and does not operate a timer for retransmission,

    The second HARQ state, the HARQ process, performs retransmission and operates a timer for the retransmission.
12. According to claim 8,

    When the set repeated transmission resource overlaps with the resource of the second CG configuration, the terminal determines data to be transmitted in the overlapped resource based on priorities of the first data and the second data.

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