[go: up one dir, main page]

WO2024136447A1 - Procédé et dispositif permettant d'exécuter un transfert de groupe dans un système de communication sans fil - Google Patents

Procédé et dispositif permettant d'exécuter un transfert de groupe dans un système de communication sans fil Download PDF

Info

Publication number
WO2024136447A1
WO2024136447A1 PCT/KR2023/021109 KR2023021109W WO2024136447A1 WO 2024136447 A1 WO2024136447 A1 WO 2024136447A1 KR 2023021109 W KR2023021109 W KR 2023021109W WO 2024136447 A1 WO2024136447 A1 WO 2024136447A1
Authority
WO
WIPO (PCT)
Prior art keywords
base station
terminal
ntn
handover
cell
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/KR2023/021109
Other languages
English (en)
Korean (ko)
Inventor
이원석
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Innovative Technology Lab Co Ltd
Original Assignee
Innovative Technology Lab Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Innovative Technology Lab Co Ltd filed Critical Innovative Technology Lab Co Ltd
Publication of WO2024136447A1 publication Critical patent/WO2024136447A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0009—Control or signalling for completing the hand-off for a plurality of users or terminals, e.g. group communication or moving wireless networks
    • 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
    • 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
    • H04B7/18539—Arrangements for managing radio, resources, i.e. for establishing or releasing a connection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0061—Transmission or use of information for re-establishing the radio link of neighbour cell information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • H04W36/083—Reselecting an access point wherein at least one of the access points is a moving node
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/16—Performing reselection for specific purposes
    • H04W36/18—Performing reselection for specific purposes for allowing seamless reselection, e.g. soft reselection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H04W72/231—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal the control data signalling from the layers above the physical layer, e.g. RRC or MAC-CE signalling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H04W72/232—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal the control data signalling from the physical layer, e.g. DCI signalling

Definitions

  • the present invention relates to a method and device for performing group handover in a wireless communication system.
  • the present invention relates to a method of performing group handover based on non-terrestrial networks (NTN).
  • NTN non-terrestrial networks
  • the International Telecommunication Union (ITU) is developing the International Mobile Telecommunication (IMT) framework and standards, and is currently discussing 5th generation (5G) communications through a program called “IMT for 2020 and beyond.” .
  • 3GPP 3rd Generation Partnership Project
  • NR New Radio
  • 5G communication uses multiple channels to overcome unfavorable channel environments such as high path-loss, phase-noise, and frequency offset that occur on high carrier frequencies. Can support transmission of physical signals or physical channels through beams. Through this, 5G communications can support applications such as enhanced Mobile Broadband (eMBB), massive Machine Type Communications (mMTC), and Ultra Reliable and Low Latency Communication (URLLC).
  • eMBB enhanced Mobile Broadband
  • mMTC massive Machine Type Communications
  • URLLC Ultra Reliable and Low Latency Communication
  • V2X communication a communication method that exchanges or shares information such as traffic conditions while communicating with road infrastructure and other vehicles while driving, can be considered.
  • V2X refers to V2V (vehicle-to-vehicle), which refers to LTE (Long Term Evolution)/NR (New Radio)-based communication between vehicles, and V2P (V2P), which refers to LTE/NR-based communication between vehicles and terminals carried by individuals.
  • vehicle-to-pedestrian and V2I/N (vehicle-to-infrastructure/network), which refers to LTE/NR-based communication between vehicles and roadside units/networks.
  • a roadside unit may be a transportation infrastructure entity implemented by a base station or a fixed terminal. As an example, it may be an entity that transmits speed notifications to a vehicle.
  • the present invention relates to a method and device for performing group handover in a wireless communication system.
  • the present invention relates to a method and device for performing group handover in an NTN environment.
  • the present invention relates to a method and device for performing group handover in consideration of feeder link switching of earth fix/moving cells in an NTN environment.
  • the present invention relates to a method and device for transmitting system information including a handover command.
  • the present invention relates to a method and device for deriving a new C-RNTI (radio network temporary identifier, RNTI) based on handover.
  • C-RNTI radio network temporary identifier
  • the present invention relates to a method and device for instructing handover performance through DCI (downlink control information) in an NTN environment.
  • a wireless user device that performs group handover based on non-terrestrial networks (NTN) in a wireless communication system
  • NTN non-terrestrial networks
  • at least one antenna for transmitting and receiving one or more wireless signals
  • at least a processor and, when executed by the at least one process, a memory that stores instructions for the wireless user device, the operations of the wireless user device are to: receive system information including a handover command from a source base station; An access procedure is performed, and when the random access procedure is completed, a radio resource control (RRC) reconfiguration complete message is transmitted, and downlink and uplink transmission with the target base station can be performed.
  • RRC radio resource control
  • group handover is performed based on a feeder link switch, where the feeder link switch is a soft feeder link switch or NTN satellite that includes information on both the source base station and the target base station at a specific time. It may be one of hard feeder link switching that includes information from either the source base station or the target base station at a specific time.
  • the feeder link switch is a soft feeder link switch or NTN satellite that includes information on both the source base station and the target base station at a specific time. It may be one of hard feeder link switching that includes information from either the source base station or the target base station at a specific time.
  • a handover command to the target base station may be included in system information at a specific time based on the handover decision.
  • a handover command to the target base station may always be included in system information.
  • a radio network temporary identifier (C-RNTI) and a security algorithm associated with a handover command are allocated at the target base station based on an individual procedure, but the C-RNTI is the C-RNTI of the source base station, the source base station It may be determined based on at least one of the PCI (physical cell ID) of and the PCI of the target cell.
  • C-RNTI radio network temporary identifier
  • the source base station It may be determined based on at least one of the PCI (physical cell ID) of and the PCI of the target cell.
  • the target base station may obtain C-RNTI related information from the source base station, and the terminal may perform a connection with the target base station based on the C-RNTI related information.
  • the terminal after receiving system information including a handover command, the terminal receives downlink control information (DCI) indicating the start of handover based on feeder link switching, and then receives downlink control information (DCI) indicating the start of handover based on feeder link switching, and then receives the target base station based on the DCI. It can be handed over to .
  • DCI downlink control information
  • DCI downlink control information
  • the DCI is scrambled into a group handover (GHO)-RNTI, and at least one terminal may be handed over to the target base station based on the DCI scrambled with the GHO-RNTI.
  • GHO group handover
  • a method of performing group handover in a wireless communication system can be provided.
  • a method of performing group handover in an NTN environment can be provided.
  • a method for transmitting system information including a handover command can be provided.
  • a method of deriving a new C-RNTI based on handover can be provided.
  • a method for instructing handover performance through DCI in an NTN environment can be provided.
  • FIG. 1 is a diagram for explaining an NR frame structure to which the present disclosure can be applied.
  • Figure 2 is a diagram showing an NR resource structure to which the present disclosure can be applied.
  • Figure 3 is a diagram showing an NTN including a transparent satellite to which the present disclosure can be applied.
  • FIG. 4 is a diagram illustrating an NTN including a regenerative satellite without inter-satellite links (ISL) to which the present disclosure can be applied.
  • ISL inter-satellite links
  • Figure 5 is a diagram showing an NTN including a reproduction satellite with an ISL to which the present disclosure can be applied.
  • FIG. 6 is a diagram illustrating a user plane (UP) protocol stack structure in an NTN including a transparent satellite to which the present disclosure can be applied.
  • UP user plane
  • FIG. 7 is a diagram illustrating a control plane (CP) protocol stack structure in an NTN including a transparent satellite to which the present disclosure can be applied.
  • CP control plane
  • Figure 8 is a diagram showing a timing advance calculation method to which the present disclosure can be applied.
  • FIG. 9 is a diagram illustrating an earth fixed cell scenario to which the present disclosure can 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.
  • Figure 12 is a diagram showing a reference location to which the present disclosure can be applied.
  • Figure 13 is a diagram showing an NTN structure that provides a relay function applicable to the present disclosure.
  • Figure 14 is a diagram showing an NTN structure that provides a multi-connection function applicable to the present disclosure.
  • Figure 15 is a diagram showing received signal strength according to distance in TN and NTN.
  • Figure 16 is a diagram showing a handover procedure applicable to the present disclosure.
  • FIG 17 is a diagram showing a feeder link switch method applicable to the present disclosure.
  • FIG. 18 is a diagram illustrating a method of performing a system information-based handover command applicable to the present disclosure.
  • Figure 19 is a diagram showing a method of transmitting C-RNTI information applicable to the present disclosure.
  • Figure 20 is a diagram showing a DCI-based handover operation applicable to this disclosure.
  • FIG. 21 is a diagram illustrating a method of performing group handover applicable to the present disclosure.
  • Figure 22 is a diagram showing a device configuration to which the present disclosure can be applied.
  • a component 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 in which another component exists in between. It may also be included.
  • a component when a component is said to “include” or “have” another component, this does not mean excluding the other component, but may further include another component, unless specifically stated to the contrary. .
  • first, second, etc. are used only for the purpose of distinguishing one component from another component, and do not limit the order or importance of the components unless specifically mentioned. 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, the second component in one embodiment may be referred to as a first component in another embodiment. It may also be called.
  • distinct components are intended to clearly explain each feature, and do not necessarily mean that the components are separated. That is, a plurality of components may be integrated to form one hardware or software unit, or one component may be distributed to form a plurality of hardware or software units. Accordingly, even if not specifically mentioned, such integrated or distributed embodiments are also included in the scope of the present disclosure.
  • components described in various embodiments do not necessarily mean essential components, and some may be optional components. Accordingly, embodiments consisting of a subset of the elements described in one embodiment are also included in the scope of the present disclosure. Additionally, embodiments that include other components in addition to the components described in the various embodiments are also included in the scope of the present disclosure.
  • This 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 (e.g., a base station) in charge of the wireless communication network, or This can be done in the process of transmitting or receiving a signal from a terminal connected to a wireless network.
  • a system e.g., 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 station non-AP STA
  • transmitting or receiving a channel includes transmitting or receiving information or signals through the channel.
  • transmitting a control channel means transmitting control information or signals through the control channel.
  • transmitting a data channel means transmitting data information or signals through a data channel.
  • NR New Radio
  • the NR system supports a variety of subcarrier spacing (SCS) by considering various scenarios, service requirements, and potential system compatibility.
  • SCS subcarrier spacing
  • the NR system uses multiple channels to overcome unfavorable channel environments such as high path-loss, phase-noise, and frequency offset that occur at high carrier frequencies.
  • the NR system can support applications such as enhanced Mobile Broadband (eMBB), massive Machine Type Communications (mMTC)/ultra Machine Type Communications (uMTC), and Ultra Reliable and Low Latency Communications (URLLC).
  • eMBB enhanced Mobile Broadband
  • mMTC massive Machine Type Communications
  • uMTC ultra Machine Type Communications
  • 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 technology that operates in consideration of backward compatibility with previous systems as well as the newly defined NR system. Therefore, the following 5G mobile communication may include technology operating based on the NR system and technology operating based on previous systems (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 can be applied.
  • 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
  • FR2 Frequency Range 2
  • 13792 7.020 ⁇ s.
  • Figure 2 is a diagram showing an NR resource structure to which the present disclosure can be applied.
  • Resource Elements (REs) in the resource grid may be indexed according to each subcarrier spacing.
  • one resource grid can be created per antenna port and per subcarrier spacing. Uplink and downlink transmission and reception can be performed based on the corresponding resource grid.
  • one resource block consists of 12 REs, and an index (nPRB) for one RB can be configured for each 12 REs.
  • the index for RB can be utilized within a specific frequency band or system bandwidth.
  • the index for RB can be defined as Equation 2 below. here, means the number of subcarriers per RB, and k means the subcarrier index.
  • an LTE/LTE-A system may support one subcarrier spacing (SCS), but an NR system may support multiple SCSs.
  • SCS subcarrier spacing
  • the new numerology for the NR system supporting multiple SCS is to solve the problem of not being able to use a wide bandwidth in the frequency range or carrier such as 700MHz or 2GHz, 3GHz or less, 3GHz-6GHz. , can operate in frequency ranges or carriers such as 6GHZ-52.6GHz or above 52.6GHz.
  • Table 1 below shows examples of numerology supported by the NR system.
  • the numerology can be defined based on the subcarrier spacing (SCS), Cyclic Prefix (CP) length, and number of OFDM symbols per slot used in an Orthogonal Frequency Division Multiplexing (OFDM) system.
  • SCS subcarrier spacing
  • CP Cyclic Prefix
  • OFDM Orthogonal Frequency Division Multiplexing
  • a normal slot can be defined as a basic time unit used to transmit one piece of data and control information in the NR system.
  • the length of the normal slot can be basically set to the number of 14 OFDM symbols.
  • subframes have an absolute time length equivalent to 1 ms in the NR system and can be used as a reference time for the length of other time sections.
  • a time interval such as a subframe of LTE may be required in the NR standard.
  • TTI Transmission Time Interval
  • one subframe may be set to 1ms and may include 14 OFDM symbols (or 12 OFDM symbols).
  • non-slots may be defined in NR.
  • a non-slot may mean a slot with a number that is at least one symbol smaller than a normal slot. For example, when providing low latency, such as a URLLC service, latency can be reduced through a non-slot with a smaller number of symbols than a normal slot.
  • the number of OFDM symbols included in the non-slot can be determined considering the frequency range. For example, in frequency ranges above 6 GHz, non-slots of 1 OFDM symbol length may be considered. As a further example, 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 can be set as the length of the mini slot up to a predetermined length (for example, normal slot length - 1).
  • a predetermined length for example, normal slot length - 1.
  • the number of OFDM symbols may be limited to 2, 4, or 7 symbols, but is not limited thereto.
  • subcarrier spacing with u equal to 1 and 2 may be used, and in the unlicensed band above 6 GHz, subcarrier spacing with u equal to 3 and 4 may be used.
  • u is 4, it may be used for SSB (Synchronization Signal Block).
  • Table 2 shows the number of OFDM symbols per slot for normal CP by subcarrier spacing setting (u) ( ), number of slots per frame ( ), number of slots per subframe ( ). Table 2 shows the above-described values based on a normal slot with 14 OFDM symbols.
  • Table 3 shows the number of slots per frame and slots per subframe when extended CP is applied (i.e., when u is 2 and subcarrier spacing is 60kHz), based on a normal slot with 12 OFDM symbols per slot. indicates 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 for each within 10 ms corresponding to one wireless frame may be set differently.
  • Table 4 can show the number of slots and symbols for each SCS. In Table 4, the SCS at 480 kHz may not be considered, but these examples are not limited.
  • communication could be performed based on a terrestrial network consisting of terminals located on the ground and base stations located on the ground.
  • the terminal can access the network via wireless.
  • the terminal can continuously receive the same service through other base stations in the terrestrial network.
  • the terminal was able to access a specific service server through other wired or Internet networks. Additionally, the terminal was able to receive a service that connects wired or wireless communication with other terminals through the network.
  • NTN non-terrestrial networks
  • NTN may refer to a network or part of a network that uses a mobile object floating in the air or space equipped with a base station or relay equipment.
  • NTN can support terminal-to-device communication services based on satellites equipped with communication functions in Low Earth Orbit (LEO) and Geostationary Earth Orbit (GEO).
  • LEO Low Earth Orbit
  • GEO Geostationary Earth Orbit
  • NTN can support terminal-to-device communication services based on aircraft equipped with communication functions within Unmanned Aircraft Systems (UAS), but is not limited to this.
  • UAS Unmanned Aircraft Systems
  • NTN non-terrestrial networks
  • TN and TN are separately described as communication systems capable of communication between terminals based on NTN, and a method of supporting communication services between terminals is described based on this.
  • a wireless communication service between a terrestrial base station and a wireless terminal or a mobile base station is described as a mobile service, but is not limited thereto.
  • communication between mobile ground base stations and at least one space base station may be mobile satellite services.
  • wireless communication services between mobile ground base stations and space base stations or between mobile ground base stations via at least one space base station may also be mobile satellite services, but are not limited thereto.
  • the following describes a method of performing communication based on a wireless communication system that supports both mobile services and mobile satellite services.
  • NTN technologies have been introduced specifically for satellite communication, but NTN can also be introduced in TN's communication system (e.g. 5G system) to operate together with TN.
  • the terminal can support NTN and TN simultaneously.
  • 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). , the method for this is described below.
  • LTE long-term evolution
  • NR new radio
  • RAT radio access technology
  • NTN Non-terrestrial networks
  • a network or part of a network that uses a mobile device floating in the air or in space equipped with a base station or relay equipment for communication
  • an NTN gateway located on the Earth's surface 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):
  • a circular orbit 35,786km above the Earth's equator which coincides with the direction of Earth's rotation.
  • the object or satellite in orbit orbits with the same period as the Earth's rotation period. Therefore, when observed from Earth, it appears to exist in a fixed location without movement.
  • LEO Low Earth Orbit
  • MEO Medium Earth Orbit
  • UAS Unmanned Aircraft Systems
  • HAPs High Altitude Platforms
  • the unmanned aerial system may include at least one of the Tethered UAS (TUA), Lighter Than Air UAS (LTA), and Heavier Than Air UAS (HTA) systems.
  • TAA Tethered UAS
  • LTA Lighter Than Air UAS
  • HTA Heavier Than Air UAS
  • It may be a wireless communication service between mobile ground base stations and one or more space base stations, between mobile land base stations and space base stations, or between mobile ground base stations via one or more space base stations.
  • Non-Geostationary Satellites
  • Satellites in LEO and MEO orbits may orbit the Earth with a period of approximately 1.5 to 10 hours.
  • This may mean changing the carrier frequency of the uplink RF signal and filtering and amplifying it before transmitting it through the downlink.
  • Uplink RF signals are transformed and amplified before being transmitted through the downlink, and signal transformation may include digital processing such as decoding, demodulation, re-modulation, re-coding, and filtering.
  • NTN gNB On board NTN gNB:
  • It may refer to an onboard satellite in which a base station (gNB) is implemented in a regenerative payload structure.
  • gNB base station
  • NTN gNB On ground NTN gNB:
  • RTD Round Trip Delay
  • the returning signal may be a signal containing 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 transparent payload or regenerative payload, and may generally be located in LEO, MEO, or GEO orbit.
  • Figure 3 is a diagram showing an NTN including a transparent satellite to which the present disclosure can be applied.
  • terminals included in the NTN may include terrestrial network terminals.
  • NTN and TN terminals may include manned or unmanned moving 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 a transparent satellite may be implemented in a manner corresponding to an RF repeater.
  • a network including transparent satellites can perform frequency conversion and amplification on wireless signals received in both uplink and downlink directions and transmit wireless signals. Therefore, the satellite can perform the function of relaying the NR-Uu wireless interface including both feeder link and service link directions, and the NR-Uu wireless interface will be described later.
  • a Satellite Radio Interface (SRI) on the feeder link may be included in the NR-Uu interface. That is, the satellite may not be the endpoint of the NR-Uu interface.
  • the NTN gateway can support all functions necessary to deliver signals defined in the NR-Uu interface.
  • other transparent satellites may be connected to the same base station on the ground. That is, a configuration in which multiple transparent satellites are connected to one terrestrial base station may be possible.
  • the base station may be an eNB or gNB, but may not be limited to a specific type.
  • FIG. 4 is a diagram illustrating an NTN including a regenerative satellite without inter-satellite links (ISL) to which the present disclosure can be applied.
  • ISL inter-satellite links
  • NTN may include a regenerative satellite.
  • a regenerative satellite may mean that a base station function is included within the satellite.
  • a regenerative satellite payload generated through a network including regenerative satellites may be implemented by regenerating signals received from the ground.
  • the regenerative satellite can receive signals from the ground based on the NR-Uu radio interface on the service link between the terminal and the satellite.
  • a regenerative satellite can receive signals from the ground through SRI (Satellite Radio Interface) on a feeder link between NTN gateways.
  • SRI Setellite Radio Interface
  • the transport layer may refer to the transport layer among the 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-coding, and filtering, but is not limited thereto.
  • Figure 5 is a diagram showing an NTN including a reproduction satellite with an ISL to which the present disclosure can be applied.
  • ISL may be defined at the transport layer.
  • ISL may be defined as a wireless 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 renewable satellite can be a base station, and multiple renewable 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 an NTN including a transparent satellite to which the present disclosure can be applied.
  • FIG. 7 is a diagram illustrating a control plane (CP) protocol stack structure in an 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 connection between a terminal and a base station in an 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 radio resource control information, etc., 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 the 3GPP RAN-related standards, but may not be limited thereto.
  • Figure 6 may be a UP protocol stack structure based on a transparent satellite. That is, in satellites and NTN gateways, only frequency conversion and amplification of wireless signals received transparently can be performed and transmitted.
  • Figure 7 may be a CP protocol stack structure based on a transparent satellite. In other words, only frequency conversion and amplification can be performed on transparently received wireless signals in satellites and NTN gateways.
  • NTN may have a larger roundtrip time (RTT) between the terminal and the base station than the existing TN. Therefore, from the UP perspective, the terminal needs to store data to be transmitted through each of the uplink and downlink in the buffer for a longer period of time due to the increase in RTT. In other words, the terminal needs to store more data in the buffer. Accordingly, the terminal may require a larger memory capacity than before, which will be described later.
  • RTT roundtrip time
  • FIG 8 is a diagram showing a timing advance calculation method to which the present disclosure can be applied.
  • the signal round-trip time may be long.
  • LEO long-trip time
  • GEO global averaged-trip time
  • propagation delay in NTN can be significantly greater than in TN.
  • cell coverage can be greater than that of a terrestrial network.
  • Figure 8 may be a method for calculating TA values generated according to satellite payload type.
  • FIG. 8(a) may be a method of calculating a TA value when the satellite payload type is a playback payload.
  • Figure 8(b) may be a method for calculating the TA value when the satellite payload type is a transparent payload.
  • satellite orbital power may mean the distance between each satellite and the receiver and the location information of each satellite.
  • the terminal can acquire the TA value by itself and then apply it. (Option 1 hereinafter).
  • the terminal may receive instructions for TA compensation and correction from the network (Option 2 hereinafter).
  • the satellite when the satellite payload type is a playback payload, the satellite can directly serve as a base station.
  • the terminal can calculate the TA value required for uplink transmission including PRACH (physical random access channel).
  • the terminal has a common TA value ( ) and TA value for each terminal ( ) can be calculated.
  • a common TA value ( ) may be the TA value required for all terminals that occur due to NTN's large cell coverage and long round trip time (RTT). In other words, since the NTN is located in the sky and has a relatively longer distance than the distance between terminals, the common TA value ( ) may be necessary.
  • the TA value for each terminal ( ) may be a value that occurs due to the different positions of each terminal within cell coverage. If the terminal knows the location of the satellite at a specific time in advance through the satellite ephemeris stored in advance or received from NTN and knows the location of the terminal through a function such as GNSS, the terminal can detect the satellite at a specific time. Since the distance between the device and the corresponding terminal can be calculated, the TA value can be corrected after learning the TA value by oneself, and through this, the TA value can be determined.
  • the terminal can perform uplink timing alignment between terminals received from the base station with full TA compensation.
  • the terminal may perform downlink and uplink frame timing alignment on the network side.
  • the satellite payload type when the satellite payload type is a transparent payload, the satellite can perform filtering and amplification of the wireless signal and transmit the signal to the NTN gateway.
  • the satellite can operate like an RF repeater.
  • the common TA value ( ) can 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 change as the NTN gateway changes 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 common TA value may be changed, and there is a need for updating in the corresponding terminal.
  • the network when setting an offset between downlink frame timing and uplink frame timing in the network, there is a need to additionally consider the case where the TA value occurring due to the feeder link is not corrected with the full TA compensation method.
  • different TA values for each terminal ( ), if only ) can be calculated the terminal needs to confirm one reference point for each beam or cell, and there is a need to transmit information about this to other terminals.
  • the network sets an offset between downlink frame timing and uplink frame timing, the network needs to manage offset information regardless of the satellite payload type.
  • the network may provide values for TA correction to each terminal, and is not limited to the above-described embodiment.
  • a method of instructing TA compensation and correction in the network may be considered.
  • a common TA value can be generated based on common elements for propagation delay shared by all terminals located within the satellite beam or cell coverage.
  • the network may transmit a common TA value to terminals for each beam or cell of each satellite based on a broadcast method.
  • the common TA value can be calculated in the network assuming at least one reference position for each satellite beam or cell.
  • the TA value (TUEx) for each terminal can be determined based on the random access procedure defined in the existing communication system (e.g. Release 15 or Release 16 of the existing NR system).
  • a new field may be needed in the random access message.
  • the terminal can support TA value correction based on this.
  • FIG. 9 is a diagram illustrating an earth fixed cell scenario to which the present disclosure can be applied.
  • a fixed cell may be a cell in which the location where signals are transmitted from the satellite is fixed.
  • satellite 1 (910) may maintain a fixed cell while varying the antenna and beam during T1 to T3.
  • satellite 2 (920) provides service at the location, thereby maintaining service continuity.
  • the beam or cell of Satellite 2 (920), which serves the same location as the location served by Satellite 1 (910) in the previous time (T1 to T3), is the beam or cell of Satellite 1 (910).
  • the characteristics can be maintained and are not limited to the above-described embodiments.
  • a service is 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.
  • PCI physical cell ID
  • it is a cell with fixed service coverage and can generally be set based on satellites whose antenna and beam angles can be varied among satellites in LEO and MEO orbits excluding GEO.
  • FIG. 10 is a diagram illustrating an earth moving cell scenario to which the present disclosure can be applied.
  • a cell with moving service coverage may be an earth moving cell.
  • Satellite 1 (1010), Satellite 2 (1020), and Satellite 3 (1030) may each provide services through their respective cells with different PCIs.
  • the antenna and beam through which the satellite transmits signals to the ground are fixed, and the form in which service coverage moves as the satellite moves with time can be referred to as an earth moving cell.
  • the ground mobile cell can be set based on satellites with fixed antenna and beam angles among satellites in LEO and MEO orbits excluding GEO.
  • the satellites can have the advantage of being cheaper and having a lower failure rate than satellites that can adjust the angle of the antenna and 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 that can logically distinguish one cell. That is, beams with the same PCI value may be included in the same cell.
  • PCI may be allocated to multiple satellite beams.
  • one PCI may be allocated 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 (or PCI) can consist of up to L SSB beams.
  • L may be 4, 8, 64, or 256 depending on the size of the frequency band and/or subcarrier band, but is not limited to the above-described embodiment.
  • one or several SSB indexes can be used for each PCI, similar to the terrestrial network (TN), which is an existing communication system (NR system).
  • TN terrestrial network
  • NR system existing communication system
  • a terminal that can access the NTN may be a terminal that supports the GNSS (Global Navigation Satellite System) function.
  • terminals that can access NTN may include terminals that do not support GNSS.
  • NTN is a terminal that supports the GNSS function, but it can also support terminals that cannot secure location information through GNSS, and is not limited to the above-described embodiment.
  • the terminal can perform communication through NTN.
  • the terminal may be provided with a 5G/B5G NTN-based non-terrestrial network-based service.
  • the terminal can escape regional, environmental, spatial and economic constraints on wireless access services (e.g., LTE, NR, WiFi, etc.) based on installation of terrestrial network equipment.
  • wireless access services e.g., LTE, NR, WiFi, etc.
  • advanced wireless access technology provided on a terrestrial network can be applied to non-terrestrial network platforms (e.g., satellites and UAVs).
  • non-terrestrial network platforms e.g., satellites and UAVs.
  • various wireless access service products and technologies can be provided along with advanced network technology.
  • the NTN platform can be operated as a kind of mirror by being equipped with a NR signal relay function or a base station (gNB, eNB) function in space or at high altitudes.
  • a NR signal relay function or a base station (gNB, eNB) function in space or at high altitudes.
  • gNB NR signal relay function
  • eNB base station
  • the NG-RAN based NTN architecture may be implemented with the “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 wireless access services as an expanded network structure and technology of the 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 integrated networks can ensure connectivity not only in very dense areas (e.g., concert halls, sports stadiums, shopping centers, etc.), but also for fast-moving objects such as airplanes, high-speed trains, vehicles, and ships. there is.
  • the NTN and TN integrated network can use data transmission services from the NTN network and the TN network simultaneously through the multi-connection function. At this time, depending on the characteristics of the traffic and the degree of traffic loading, both the efficiency and economic feasibility of the 5G wireless transmission service can be achieved by selectively utilizing a better network.
  • Terminals located on plain ground can use wireless data services by simultaneously connecting the NTN network and the TN network.
  • the terminal can simultaneously connect to one or more NTN platforms (e.g., two or more LEO/GEO satellites) to provide wireless data access services for poor environments or areas that are difficult to support in the TN network.
  • NTN platforms e.g., two or more LEO/GEO satellites
  • the terminal can be used in connection with various services.
  • the integrated NTN network and TN network can improve the reliability of autonomous driving services and perform efficient network operation, and are not limited to the above-described embodiments.
  • the limitations of services that can be provided by V2X technology based on LTE mobile communication or standard technology based on the IEEE 802.11p standard may be similar.
  • the LTE V2X standard can be provided to meet the requirements defined in C-ITS (e.g., time delay of about 100ms, reliability of about 90%, and generation of messages of tens to hundreds of bytes in size about 10 times per second, etc.). Therefore, new V2X services that require low latency, high reliability, high volume data traffic, and improved location determination may be needed.
  • standardization of 5G wireless access technology e.g., NR (New Radio)
  • 5G wireless access technology e.g., NR (New Radio)
  • the NTN network can be used to support IoT services in poor environments and areas not covered by terrestrial networks.
  • IoT devices may frequently need to perform wireless communication with minimal power consumption in poor channel environments (e.g. mountains, deserts, or the sea).
  • Previously proposed cellular-based technologies may be primarily aimed at mobile broadband (MBB) services. Therefore, the efficiency of providing IoT services in terms of wireless resource utilization and power control may be low, and flexible operation may not be supported.
  • MBB mobile broadband
  • an NTN network can be applied, through which services can be improved.
  • 5G mobile communication-based sidelink technology is applied through the NTN network, wide coverage and mobility can be provided to users through a more efficient wireless communication method than the current Bluetooth/WiFi-based wearable equipment. . Additionally, it can be differentiated from existing communication standards in applications that require high data transmission rates and mobility support using wearable devices (e.g. wearable multimedia services).
  • the public safety communication network can be improved and disaster communication coverage expanded through the NTN network.
  • the high-reliability, low-latency technology of the 5G mobile communication system through the NTN network can provide public services such as disaster response.
  • mobile broadband services can be supported even in deserts or high mountainous areas by using mobile base stations such as drones that support 5G mobile communication.
  • the NTN network is applied to public services, it may be possible to expand disaster communication coverage by covering various regions.
  • Figure 12 is a diagram showing a reference position to which the present disclosure can be applied.
  • satellites 1210 and 1220 having an earth-fixed beam may provide services to a fixed location for a specific time based on the fixed beam.
  • the distance between the terminal and the satellite is large, so the signal strength within the cell may be similar. Therefore, the UE in the RRC idle state can consider the reference location as a condition for performing neighboring cell measurement for cell reselection. That is, the RRC idle state terminal can perform cell measurement for cell reselection based on the distance between the terminal and the reference location.
  • a terminal located within the coverage of Satellite 1 (Sat 1, 1210) can obtain reference location information through system information from the network.
  • the terminal can check the distance between the terminal and the reference location based on the location of the terminal. Here, if the distance between the terminal and the reference location is greater than the distance threshold, the terminal can recognize that the current location of the terminal is outside the cell and perform measurements on adjacent cells. That is, the terminal can perform cell measurement for cell reselection by considering the distance between the reference position and the terminal.
  • FIG. 13 is a diagram showing an NTN structure that provides a relay function applicable to the present disclosure.
  • an NTN structure that provides a relay function can be considered.
  • the terminal 1310 can communicate with the relay node 1320 through the Uu interface.
  • the relay node 1320, transparent payload-based satellite 1331, NTN gateway, and gNB 1340 may be configured as a radio access network (RAN). That is, in the case of providing a relay function based on the transparent payload-based satellite 1331 in FIG. 13(a), the RAN may include a relay node 1320, an NTN gateway, and a terrestrial base station.
  • RAN radio access network
  • the ground station 1340 may communicate with the core network 1350, and the core network 1350 may be connected to the data network 1360.
  • the terminal 1310 may communicate with the relay node 1320 through the Uu interface.
  • relay nodes 1320 and reproduction payload-based satellites 1332 may be configured as a RAN. That is, in the case of providing a relay function based on the reproduction payload-based satellite 1332 in FIG. 13(b), the RAN includes a relay node 1320 and a reproduction payload-based satellite 1332, and the NTN gateway 1340 ) can be used to communicate with the core network 1350.
  • the core network 1350 may be connected to the data network 1360. That is, the reproduction payload-based satellite 1332 may perform the role of a base station, but may not be limited thereto.
  • Figure 14 is a diagram showing an NTN structure that provides a multi-connection function applicable to the present disclosure.
  • the terminal can perform multi-connection based on NTN/TN and NTN/NTN.
  • the terminal can perform multi-connection through NTN and TN.
  • the terminal 1410 can perform multi-connection through the base station 1431 and the TN base station 1432, which are configured based on the transparent payload-based satellite 1421.
  • each base station 1431 and 1432 may be connected to the core network 1440, and the core network 1440 may be connected to the data network 1450.
  • the terminal 1410 may be connected based on the reproduction payload-based satellite 1422.
  • the reproduction payload-based satellite 1422 is a gNB distributed unit (DU), and the gNB DU may be controlled by the gNB CU 1433.
  • Multi-connection can be performed through the gNB CU (1433) and the TN base station (1434).
  • each base station 1433 and 1434 may be connected to the core network 1440, and the core network 1440 may be connected to the data network 1450.
  • Figure 15 is a diagram showing received signal strength according to distance in TN and NTN.
  • the signal strength of terminals 1521 and 1522 located within the coverage of the base station 1510 may have a large difference based on the distance between the base station 1510 and the terminal.
  • the received signal strength of a terminal (near-UE, 1521) located in the center of coverage of the base station 1510, whose transmission signal is on the ground is higher than the received signal strength of a terminal (far-UE, 1522) located on the outskirts of the coverage. It can be large, and the difference can be big enough to be discernible.
  • FIG. 15(a) in a TN environment, the signal strength of terminals 1521 and 1522 located within the coverage of the base station 1510 may have a large difference based on the distance between the base station 1510 and the terminal.
  • the received signal strength of a terminal (near-UE, 1521) located in the center of coverage of the base station 1510, whose transmission signal is on the ground is higher than the received signal strength
  • terminals 1531 and 1532 located within the coverage of the satellite 1530 in the NTN environment can be considered.
  • the transmitted signal is generated from a satellite (1530) located at a high location
  • the difference in intensity may not be large. Therefore, in an NTN environment, there may be limitations in the UE performing cell reselection considering only the received signal strength.
  • the terminal may not perform measurement for cell reselection because the difference in received signal strength within satellite coverage is not large. Accordingly, there may be insufficient time for neighboring cell SSB search, signal strength measurement, and camping.
  • a terminal in the above-described fixed cell (earth fixed cell) or fixed beam may obtain information for time-based cell reselection through system information.
  • the terminal can obtain t-service at the time when satellite coverage is maintained (or service time) through system information.
  • the terminal may perform cell reselection based on t-service time information.
  • the t-service time may be the time when a service is provided for a fixed cell, so when the terminal receives t-service information through system information, it can regard the cell as a fixed cell.
  • the terminal may regard the cell as an earth-moving cell. That is, the terminal can implicitly obtain fixed cell and mobile cell information through t-service information.
  • a terminal in a fixed cell may perform measurement for cell reselection when the distance between the reference location and the terminal becomes greater than the distance threshold, as described above. That is, when the terminal is located within fixed cell coverage, the terminal can perform measurement for cell reselection using reference location information or t-service information.
  • the reference position of the mobile cell may be different from that of the fixed cell. Specifically, since the mobile cell moves according to the movement of the satellite, it is necessary to move the reference position as well. Therefore, when a terminal performs measurement for cell reselection based on the reference position of a moving cell, if measurement is performed using the existing reference position determination method, a problem may occur where a terminal that does not need measurement performs measurement. there is.
  • a terminal in an NTN environment, can operate in a frequency band of 10 GHz or higher and can communicate through satellite based on this.
  • mobility, service continuity, emergency call, and public warning system considering high propagation delay and satellite movement may be provided in the NTN environment. , is not limited to specific embodiments.
  • an NTN cell is an earth fixed cell, where the cell's position is fixed on the ground regardless of the movement of the satellite, and an earth moving cell, where the cell's position continuously changes according to the movement of the satellite. cell) may be included.
  • terminals within the NTN cell may need to perform handover at once according to the movement of the NTN cell, and signaling overhead may occur based on this.
  • a feeder link switch may need to be performed according to the movement of a satellite in an earth fixed/mobile cell. When feeder link switching is performed, the satellite may need to terminate the connection with the existing gateway and establish a connection with a new gateway.
  • all terminals connected to the NTN cell also need to perform handover because their gateways are changed based on feeder link switching. Therefore, the NTN cell needs to transmit a handover command to all terminals connected to the cell.
  • the base station must allocate DL (downlink) resources (DL assignment) to transmit a handover command as many as the number of terminals within NTN coverage, and can transmit the handover command to the terminals using the allocated resources.
  • Terminals that have received a handover command can attempt a random access channel (RACH) procedure with the target base station.
  • RACH random access channel
  • a method of performing group handover will be described taking the above-mentioned points into account.
  • the following describes a method of transmitting a handover command to the terminal in common through a radio resource control (RRC) message and a method of instructing the start of handover through downlink control information (DCI). Describe.
  • RRC radio resource control
  • DCI downlink control information
  • the base station may indicate target cell information to the terminal through system information to reduce signaling overhead.
  • Figure 16 is a diagram showing a handover procedure applicable to the present disclosure.
  • the terminal needs to obtain information about the target cell for handover.
  • the target cell information may include radio bearer configuration information and other information, but is not limited to a specific embodiment.
  • the source cell may confirm handover from the target cell and then obtain information about the target cell from the target cell. Afterwards, the source cell can transmit the handover command message including target cell information to the terminal.
  • target cell information may be included in the RRC reconfiguration message.
  • the terminal 1610 may handover from the source base station (source, 1620) to the target base station (target, 1630) and perform communication with the target base station (1630).
  • the terminal 1610 can transmit a measurement report to the source base station 1620.
  • the terminal 1610 can transmit the signal strengths of the serving cell and neighboring cells to the source base station 1620 through a measurement report.
  • the serving cell and the neighboring cell can be distinguished through the serving cell ID and the PCI of the neighboring cell.
  • the terminal may transmit at least one of reference signal received power (RSRP), reference signal received quality (RSRQ), and signal interference noise ratio (SINR) information of the corresponding cell in the measurement report.
  • RSRP reference signal received power
  • RSRQ reference signal received quality
  • SINR signal interference noise ratio
  • the source base station 1620 may determine whether to handover the terminal by considering the measurement report information received from the terminal 1610 and other information. Here, other information may include cell load, radio capability, and other information, and is not limited to a specific form. Afterwards, the source base station 1620 may transmit a handover request to the target base station 1630, which has decided to handover the terminal.
  • the handover request may include an RRC message and may further include information for handover, target cell ID, PDU (protocol data unit) session list, and other information.
  • the target base station 1630 receives the handover request, determines whether to grant the handover based on the information included in the handover request, and transmits a handover request response (handover request ACK) to the source base station 1620. You can.
  • the handover request response may include permitted PDU session list and non-allowed PDU session list information.
  • the source base station 1620 may transmit an RRC reconfiguration message to the terminal 1610 by including information about the target cell in the handover command message.
  • the information on the target cell may include a target cell ID, a new C-RNTI (radio network temporary identifier), and a security algorithm, but may not be limited to the corresponding embodiment.
  • the terminal 1610 may perform uplink synchronization with the target base station 1630 through a random access channel (RACH) procedure based on the received RRC reconfiguration message information.
  • RACH random access channel
  • the RACH information may include dedicated RACH information (dedicated RACH configuration) within the handover command message, and the RACH procedure may be performed based on the dedicated RACH information.
  • the terminal 1610 may complete the RRC configuration procedure with the target base station 1630 by sending an RRC reconfiguration complete message to the target base station 1630.
  • the target base station 1630 can perform a path switch using a user plane function (UPF) on the core network and perform data transmission with the terminal.
  • UPF user plane function
  • the target cell in which the terminal performs handover refers to the cell of the target base station 1630
  • the information on the neighboring cell in the measurement report may refer to the cell of the target base station, but in this embodiment, It may not be limited.
  • FIG. 17 is a diagram showing a feeder link switch method applicable to the present disclosure.
  • the feeder link of an earth fixed/moving cell may vary depending on the movement of the satellite.
  • an earth fixed/mobile cell may maintain a connection with NTN Gateway 1 (1711) - Base Station 1 (1721), then disconnect and establish a connection with a new NTN Gateway 2 (1712) - Base Station 2 (1722).
  • NTN gateway 1 (1711) - base station 1 (1721) to the newly connected NTN gateway 2 (1712) - base station 2 (1722).
  • the handover may support a soft feeder link switch and a hard feeder link switch.
  • the soft feeder link switch may be a case where the NTN satellite has both source base station and target base station information at a specific time.
  • a hard feeder link switch may be a case where the NTN satellite contains information from only one base station at a specific time. Handover can be performed considering the cases of the soft feeder link switch and the hard feeder link switch described above, and is not limited to a specific embodiment.
  • the source base station may recognize information on the target base station (or target cell) based on satellite orbit information. Accordingly, the source base station (or source cell) may not decide on handover according to the measurement report, which will be described later.
  • the handover decision based on the UE's measurement report may not be performed at the source base station (or source cell).
  • a handover command to the target base station (or target cell) may be configured in advance.
  • a handover command to the target base station (or target cell) can be configured and transmitted to a terminal within NTN coverage through system information, thereby reducing signaling overhead.
  • FIG. 18 is a diagram illustrating a method of performing a system information-based handover command applicable to the present disclosure.
  • a handover command can be transmitted to the terminal 1810 through an RRC message (or system information).
  • RRC message or system information
  • the network can recognize target base station (or target cell) information according to satellite orbit information. Therefore, the network can recognize which base station (or cell) to handover the terminal to, regardless of the terminal's measurement report information.
  • the system information may include a handover command.
  • a handover command may always exist in system information.
  • a handover command may exist only at a specific time in system information.
  • a handover command to the target base station (or target cell) can be transmitted as system information at a specific time before the feeder link switch is needed.
  • system information may always include a handover command to transmit a handover command to a target base station (or target cell), and may not be limited to a specific form.
  • the source base station 1820 may determine a handover decision (HO) when the feeder link to which the NTN satellite is connected must be changed to a new NTN gateway. That is, the HO decision may be performed at a specific time before the feeder link switch is performed according to satellite movement.
  • the system information may include a handover command to the target base station (or target cell, 1830) at the specific time.
  • the system information may always include a handover command to the target base station (or target cell, 1830).
  • the source base station 1820 may transmit a handover request to the target base station 1830.
  • the target base station 1830 receives the handover request, determines whether to grant the handover based on the information included in the handover request, and transmits a handover request response (handover request ACK) to the source base station 1820.
  • the handover request response (handover request ACK) may include permitted PDU session list and non-allowed PDU session list information.
  • the source base station 1820 may include an RRC reconfiguration message including information on the target cell in the handover command message as system information and transmit it to the terminal 1810.
  • the information on the target cell may not include C-RNTI, unlike FIG. 16. Because C-RNTI is designated information, it may not be included in the handover command message within system information.
  • the C-RNTI to the target base station (or target cell, 1830) may be derived in different ways or in a random access procedure.
  • the information on the target cell may not include a security algorithm, unlike FIG. 16.
  • a security algorithm may be information that should not be commonly transmitted through system information due to security concerns.
  • the security algorithm and security procedure of the target base station can be derived in the process of performing the random access procedure.
  • the terminal can perform the RACH procedure for handover to the target base station (or target cell, 1830) based on the handover command in the system information.
  • the handover command included in the system information is commonly transmitted information, a dedicated RACH resource for use by the terminal may not be configured. Therefore, the terminal can perform a contention-based RACH procedure.
  • the terminal may connect to the target base station 1830 through a dedicated RACH resource.
  • the dedicated RACH resource to be used by the UE may be indicated at a specific time rather than in a preamble unit. That is, the dedicated RACH resource to be used by the terminal may be indicated based on a specific time considering the feeder link switch based on satellite movement, but is not limited to this embodiment.
  • the terminal 1810 can complete the RRC configuration procedure with the target base station 1830 by sending an RRC reconfiguration complete message to the target base station 1830.
  • the terminal 1810 can successfully complete handover with the target base station 1830 and perform DL/UL data transmission.
  • the handover command can be commonly transmitted to a plurality of terminals through system information.
  • the existing handover command is transmitted in a format specified for each terminal as shown in FIG. 16, dedicated RACH resources and C-RNTI to be used by the target base station (or target cell, 1830) can be configured.
  • the handover command in FIG. 18 is commonly transmitted to a plurality of terminals through system information, a method of configuring RACH resources and C-RNTI to be used for handover may be necessary.
  • there is a need to configure a time when handover to the target base station (or target cell, 1830) should be performed. That is, even if handover is performed based on a handover command included in system information, there is a need to configure at what point the handover should be performed.
  • the handover time may be indicated through DCI, and this will be described later.
  • the C-RNTI can be newly allocated through the RACH procedure between the terminal and the target base station (or target cell).
  • the C-RNTI to be used by the target base station (or target cell) may be derived based on at least one of the parameters in Table 5 below.
  • the C-RNTI that the UE will use for handover to the target base station (or target cell) is the C-RNTI of the source base station (or source cell), the PCI of the source base station (or source cell), and the target base station (or target cell).
  • the C-RNTI that the UE will use for handover to the target base station (or target cell) is the C-RNTI of the source base station (or source cell), the PCI of the source base station (or source cell), and the target base station (or target cell).
  • the PCIs but may not be limited to the corresponding embodiment.
  • a case where hard feeder link switching is performed in an NTN system can be considered.
  • the NTN satellite performs a hard feeder link switch with a new NTN gateway
  • the NTN satellite is connected to only one base station at a specific time, so a new cell may be created by the newly connected base station. Therefore, even if the C-RNTI used by the source base station (or source cell) is used as is or is derived by considering some or all of the parameters in Table 15, the target base station (or target cell) does not recognize the information. If you are doing this, there may not be a problem.
  • Soft feeder link switching differs from hard feeder link switching in that a source base station (or source cell) and a target base station (or target cell) can coexist at a specific time.
  • the C-RNTI of the terminal that performs initial access to the target base station (or target cell) or establishes an RRC connection and the C-RNTI that is handed over to the target base station (or target cell) based on soft feeder link switching overlap. Cases may arise. Therefore, the terminal cannot use the C-RNTI allocated from the source base station (or source cell) as is.
  • the C-RNTI information being used by the source base station (or source cell) can be transmitted to the target base station (or target cell), thereby preventing overlapping C-RNTI use.
  • Figure 19 is a diagram showing a method of transmitting C-RNTI information applicable to the present disclosure.
  • the handover command when the handover command is transmitted included in system information, the handover command is commonly transmitted within NTN coverage, so it cannot include the C-RNTI that the target base station (or target cell) should use. , which is the same as described above.
  • the target base station (or target cell, 1930) obtains C-RNTI information from the source base station (or source cell, 1920) to determine a new C-RNTI to be used by UEs within NTN coverage. You can.
  • the target base station may obtain C-RNTI information from the source base station (or source cell, 1920).
  • the source base station 1820 may include system information including target cell information in a handover command message and transmit it to the terminal 1910.
  • the information on the target cell may not include C-RNTI, unlike FIG. 16. Because C-RNTI is designated information, it may not be included in the handover command message within system information.
  • the C-RNTI to the target base station (or target cell, 1930) can be derived based on at least one of the parameters in Table 5, which is as described above.
  • the information on the target cell may not include a security algorithm, unlike FIG. 16. Security algorithms cannot be commonly transmitted through system information due to security issues.
  • the security algorithm and security procedure of the target base station can be derived in the process of performing the random access procedure.
  • the source base station or source cell, 1920
  • feeder link switching can be performed.
  • the terminal 1910 can perform a RACH procedure for handover to the target base station (or target cell, 1930) based on the handover command in the system information.
  • the terminal 1910 can complete handover to the target base station 1930 and perform DL/UL data transmission.
  • FIG. 20 is a diagram showing a DCI-based handover operation applicable to this disclosure.
  • the source base station or source cell, 2020
  • the source base station may commonly transmit a handover command to terminals within NTN coverage through system information.
  • the source base station or source cell, 2020
  • the DCI may be scrambled with a group common (or common) RNTI to indicate the start of handover for at least one UE. In other words, DCI may not be scrambled with the specified RNTI.
  • the source base station (or source cell, 2020) may include information on the target cell in the handover command message and transmit the RRC reconfiguration message by including it in the system information, as described above. .
  • the information on the target cell may not include C-RNTI, unlike FIG. 16. Because C-RNTI is designated information, it may not be included in the handover command message within system information.
  • the C-RNTI to the target base station (or target cell, 1930) can be derived based on at least one of the parameters in Table 5, which is as described above.
  • the information on the target cell may not include a security algorithm, unlike FIG. 16. Security algorithms cannot be commonly transmitted through system information due to security issues. In consideration of the above, the security algorithm and security procedure of the target base station (or target cell, 1930) can be derived in the process of performing the random access procedure.
  • the source base station (or source cell, 2020) may transmit a DCI scrambled with a group handover (GHO)-RNTI within NTN coverage to instruct one or more terminals to perform a handover.
  • the terminal 2010 can successfully perform a random access procedure with the target base station (or target cell), transmit an RRC reconfiguration message, and perform DL/UL data transmission after completion of handover, which is Same as described above.
  • DCI scrambled with GHO-RNTI can indicate whether handover is performed according to a handover command in system information.
  • one or more handover commands may be configured in system information.
  • the DCI may indicate the handover to be performed based on the index for the handover to be performed among one or more handover commands.
  • GHO-RNTI is only one example and may not be limited to the name or embodiment.
  • the handover command could be commonly configured through system information.
  • the handover command is not limited to this and may be pre-configured through another RRC message. More specifically, if a handover command for feeder link switching is configured in the RRC reconfiguration message, the UE can perform handover after receiving the DCI scrambled with GHO-RNTI. That is, the terminal can perform a handover indicated by DCI rather than performing a conventional handover.
  • the handover command is pre-configured through an RRC message other than system information
  • the other RRC message may include designated information such as C-RNTI.
  • other RRC messages may further include information designated as target cell information.
  • the method of starting a handover based on DCI can be applied in the same way, and is not limited to a specific embodiment.
  • FIG. 21 is a diagram illustrating a method of performing group handover applicable to the present disclosure.
  • the terminal can receive system information including a handover command from the source base station (S2110). After that, the terminal performs a random access procedure with the target base station (S2120), and the random access procedure is When completed, an RRC reconfiguration complete message can be transmitted. (S2130) After that, when the handover procedure is completed, the terminal can perform downlink and uplink transmission with the target base station. (S2140) Here, group handover is performed by the feeder. It may be performed based on link switching.
  • the feeder link switch is either a soft feeder link switch, in which the NTN satellite contains information from both the source base station and the target base station at a specific time, or a hard feeder link switch, in which the NTN satellite contains information from either the source base station or the target base station at a specific time. It may be any one, as described above.
  • a handover command to the target base station may be included in system information at a specific time based on the handover decision.
  • a handover command to the target base station may always be included in system information, as described above.
  • the C-RNTI and security algorithm associated with the handover command may be assigned at the target base station based on individual procedures.
  • the C-RNTI may be determined based on at least one of the C-RNTI of the source base station, the physical cell ID (PCI) of the source base station, and the PCI of the target cell, and may be as shown in Table 5.
  • the target base station obtains C-RNTI related information from the source base station, and the terminal can connect to the target base station based on the C-RNTI related information.
  • the terminal may receive a DCI indicating the start of handover based on feeder link switching, and may be handed over to the target base station based on the DCI.
  • the DCI is scrambled with group handover (GHO)-RNTI, and at least one terminal can be handed over to the target base station based on the DCI scrambled with GHO-RNTI, as described above.
  • GHO group handover
  • Figure 22 is a diagram showing a device configuration to which the present disclosure can be applied.
  • the first device 2200 and the second device 2250 can communicate with each other.
  • the first device 2200 may be a base station device and the second device 2250 may be a terminal device.
  • both the first device 2200 and the second device 2250 may be terminal devices. That is, the first device 2200 and the second device 2250 may be devices that communicate with each other based on NR-based communication.
  • the base station device 2200 may include a processor 2220, an antenna unit 2212, a transceiver 2214, and a memory 2216.
  • the processor 2220 performs baseband-related signal processing and may include an upper layer processing unit 2230 and a physical layer processing unit 2240.
  • the upper layer processing unit 2230 may process operations of a MAC (Medium Access Control) layer, RRC (Radio Resource Control) layer, or higher layers.
  • the physical layer processing unit 2240 may process physical (PHY) layer operations (e.g., uplink reception signal processing, downlink transmission signal processing).
  • the processor 2220 may also control the overall operation of the base station device 2200.
  • the antenna unit 2212 may include one or more physical antennas, and when it includes multiple antennas, it may support Multiple Input Multiple Output (MIMO) transmission and reception. Additionally, beamforming may be supported.
  • the memory 2216 may store information processed by the processor 2220, software related to the operation of the base station device 2200, an operating system, applications, etc., and may also include components such as buffers.
  • the processor 2220 of the base station device 2200 may be configured to implement the operations of the base station in the embodiments described in the present invention.
  • the terminal device 2250 may include a processor 2270, an antenna unit 2262, a transceiver 2264, and a memory 2266.
  • the terminal device 2250 can communicate with the base station device 2200.
  • the terminal device 2250 can perform sidelink communication with another terminal device. That is, the terminal device 2250 of the present invention refers to a device that can communicate with at least one of the base station device 2200 and other terminal devices, and is not limited to communication with a specific device.
  • the processor 2270 performs baseband-related signal processing and may include an upper layer processing unit 2280 and a physical layer processing unit 2290.
  • the upper layer processing unit 2280 can process operations of the MAC layer, RRC layer, or higher layers.
  • the physical layer processing unit 2290 may process PHY layer operations (e.g., downlink received signal processing, uplink transmitted signal processing, and sidelink signal processing).
  • the processor 2270 may also control the overall operation of the terminal device 2250.
  • the antenna unit 2262 may include one or more physical antennas, and may support MIMO transmission and reception when it includes a plurality of antennas. Additionally, beamforming may be supported.
  • the memory 2266 may store information processed by the processor 2270, software related to the operation of the terminal device 2250, an operating system, applications, etc., and may also include components such as buffers.
  • the terminal device 2250 according to an example of the present invention may be associated with a vehicle.
  • terminal device 2250 may be integrated into, located in, or on a vehicle. Additionally, the terminal device 2250 according to the present invention may be the vehicle itself. Additionally, the terminal device 2250 according to the present invention may be at least one of a wearable terminal, AV/VR, IoT terminal, robot terminal, and public safety terminal.
  • the terminal device 2250 to which the present invention can be applied is any type of device that supports interactive services using side links for services such as Internet access, service performance, navigation, real-time information, autonomous driving, and safety and risk diagnosis. It may also include communication devices. Additionally, AR/VR devices capable of sidelink operation or any type of communication device that becomes a sensor and performs a relay operation may be included.
  • the vehicle/terminal to which the present invention is applied may include an autonomous vehicle/driving terminal, a semi-autonomous vehicle/driving terminal, a non-autonomous vehicle/driving terminal, etc.
  • the terminal device 2250 according to an example of the present invention is described as being associated with a vehicle, but one or more of the UEs may not be associated with the vehicle. This is an example and should not be construed to limit application of the present invention to the described example.
  • the terminal device 2250 according to an example of the present invention may also include various types of communication devices capable of performing cooperation to support interactive services using sidelinks. In other words, not only can the terminal device 2250 directly support an interactive service using a sidelink, but it can also be used as a cooperative device to support an interactive service using a sidelink.
  • the terminal device 2250 may receive system information including a handover command from the source base station. Afterwards, the terminal device 2250 may perform a random access procedure with the target base station and transmit an RRC reconfiguration complete message when the random access procedure is completed. Thereafter, when the handover procedure is completed, the terminal device 2250 can perform downlink and uplink transmission with the target base station.
  • group handover may be performed based on feeder link switching.
  • the feeder link switch is either a soft feeder link switch, in which the NTN satellite contains information from both the source base station and the target base station at a specific time, or a hard feeder link switch, in which the NTN satellite contains information from either the source base station or the target base station at a specific time. It may be any one, as described above.
  • a handover command to the target base station may be included in system information at a specific time based on the handover decision.
  • a handover command to the target base station may always be included in system information, as described above.
  • the C-RNTI and security algorithm associated with the handover command may be assigned at the target base station based on individual procedures.
  • the C-RNTI may be determined based on at least one of the C-RNTI of the source base station, the physical cell ID (PCI) of the source base station, and the PCI of the target cell, and may be as shown in Table 5.
  • the target base station obtains C-RNTI related information from the source base station, and the terminal can connect to the target base station based on the C-RNTI related information.
  • the terminal may receive a DCI indicating the start of handover based on feeder link switching, and may be handed over to the target base station based on the DCI.
  • the DCI is scrambled with group handover (GHO)-RNTI, and at least one terminal can be handed over to the target base station based on the DCI scrambled with GHO-RNTI, as described above.
  • GHO group handover
  • various embodiments of the present disclosure may be implemented by hardware, firmware, software, or a combination thereof.
  • one or more ASICs Application Specific Integrated Circuits
  • DSPs Digital Signal Processors
  • DSPDs Digital Signal Processing Devices
  • PLDs Programmable Logic Devices
  • FPGAs Field Programmable Gate Arrays
  • general purpose It can be implemented by a processor (general processor), controller, microcontroller, microprocessor, etc.
  • the scope of the present disclosure is to include software or machine-executable instructions (e.g., operating systems, applications, firmware, programs, etc.) that allow operations according to the methods of various embodiments to be executed on a device or computer, and such software or It includes non-transitory computer-readable medium in which instructions, etc. are stored and can be executed on a device or computer.
  • software or machine-executable instructions e.g., operating systems, applications, firmware, programs, etc.

Landscapes

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

Abstract

Un système de communication sans fil peut : recevoir, d'une station de base source, des informations système comprenant une commande de transfert ; effectuer une procédure d'accès aléatoire avec une station de base cible ; lorsque la procédure d'accès aléatoire est terminée, transmettre un message de fin de reconfiguration de commande de ressources radio (RRC) ; et effectuer une transmission en liaison descendante et en liaison montante avec la station de base cible.
PCT/KR2023/021109 2022-12-20 2023-12-20 Procédé et dispositif permettant d'exécuter un transfert de groupe dans un système de communication sans fil Ceased WO2024136447A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2022-0179700 2022-12-20
KR20220179700 2022-12-20

Publications (1)

Publication Number Publication Date
WO2024136447A1 true WO2024136447A1 (fr) 2024-06-27

Family

ID=91589474

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2023/021109 Ceased WO2024136447A1 (fr) 2022-12-20 2023-12-20 Procédé et dispositif permettant d'exécuter un transfert de groupe dans un système de communication sans fil

Country Status (2)

Country Link
KR (1) KR20240099072A (fr)
WO (1) WO2024136447A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN119727883A (zh) * 2025-02-28 2025-03-28 京信网络系统股份有限公司 星间切换方法、装置、基站通信设备和可读存储介质

Non-Patent Citations (5)

* Cited by examiner, † Cited by third party
Title
CATT: "Discussion on NTN Mobility Enhancements", 3GPP DRAFT; R2-2209408, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG2, no. Electronic; 20221010 - 20221019, 30 September 2022 (2022-09-30), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France, XP052262739 *
HUAWEI, HISILICON: "RACH-less handover for NTN", 3GPP DRAFT; R2-1904167 RACH-LESS HANDOVER FOR NTN, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG2, no. Xi’an, China; 20190408 - 20190412, 29 March 2019 (2019-03-29), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France , XP051693397 *
LILI ZHENG, HUAWEI, HISILICON: "Discussion on NTN handover enhancements", 3GPP DRAFT; R2-2212827; TYPE DISCUSSION; NR_NTN_SOLUTIONS-CORE, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. 3GPP RAN 2, no. Toulouse, FR; 20221114 - 20221118, 4 November 2022 (2022-11-04), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France, XP052216895 *
MODERATOR (THALES): "FL Summary on enhancements on UL time and frequency synchronization for NR", 3GPP DRAFT; R1-2102215, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG1, no. e-Meeting; 20210125 - 20210205, 8 February 2021 (2021-02-08), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France , XP051977777 *
WONSEOK LEE, ITL: "View on NTN HO enhancements", 3GPP DRAFT; R2-2212802; TYPE DISCUSSION, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. 3GPP RAN 2, no. Toulouse, FR; 20221114 - 20221118, 4 November 2022 (2022-11-04), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France, XP052216871 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN119727883A (zh) * 2025-02-28 2025-03-28 京信网络系统股份有限公司 星间切换方法、装置、基站通信设备和可读存储介质

Also Published As

Publication number Publication date
KR20240099072A (ko) 2024-06-28

Similar Documents

Publication Publication Date Title
WO2022215901A1 (fr) Procédé et dispositif de mise en œuvre de communication dans un système de communication sans fil
WO2022154560A1 (fr) Communication associée à un ntn
WO2022211426A1 (fr) Procédé et appareil de communication entre un réseau non terrestre et un réseau terrestre et terminal dans un système de communication sans fil
WO2023003397A1 (fr) Gestion de mesure cellulaire
WO2022031103A1 (fr) Procédé et dispositif de transmission et de réception d'un signal sans fil dans un système de communication sans fil
WO2024034958A1 (fr) Procédé et dispositif de mise à jour d'emplacement de référence dans un système de communication sans fil
WO2021230401A1 (fr) Procédé pour réaliser une communication coopérative par un équipement utilisateur (ue) dans un système de communication sans fil prenant en charge une liaison latérale, et appareil associé
WO2023177167A1 (fr) Procédé et appareil pour effectuer une émission et une réception en liaison montante dans un système de communication sans fil
WO2023068801A1 (fr) Procédé de retransmission dans un processus harq dans un système de réseau non terrestre (ntn)
WO2020171387A1 (fr) Procédé pour effectuer un balayage de faisceau par un équipement utilisateur dans un système de communication sans fil prenant en charge une liaison latérale, et dispositif associé
WO2023014169A1 (fr) Procédé et dispositif pour effectuer une retransmission sur la base d'une procédure harq dans un système de communication sans fil
WO2024136447A1 (fr) Procédé et dispositif permettant d'exécuter un transfert de groupe dans un système de communication sans fil
WO2024136450A1 (fr) Procédé et dispositif permettant d'exécuter un transfert sans rach dans un système de communication sans fil
WO2022154418A1 (fr) Dispositif et procédé permettant de réaliser une procédure d'accès aléatoire dans un système de communication sans fil
WO2024101974A1 (fr) Procédé et dispositif d'opération de harq dans un système de communication sans fil
WO2021206465A1 (fr) Procédé de définition de différence de temps dans un système iab, et dispositif utilisant ledit procédé
WO2023282582A1 (fr) Configuration d'espace de mesure
WO2024136453A1 (fr) Procédé et appareil permettant d'exécuter un transfert conditionnel dans un système de communication sans fil
WO2025121939A1 (fr) Procédé et dispositif pour effectuer un transfert sur la base de réseaux non terrestres dans un système de communication sans fil
WO2024136449A1 (fr) Procédé et appareil pour effectuer un groupage de dmrs de pusch dans un système de communication sans fil
WO2025071008A1 (fr) Procédé et appareil d'intégration de liaison d'accès et de liaison terrestre sur la base d'un réseau non terrestre dans un système de communication sans fil
WO2024076197A1 (fr) Procédé et dispositif de transmission répétitive de pucch dans un système de communication sans fil
WO2025037892A1 (fr) Procédé et dispositif d'intégration de liaison d'accès et de liaison terrestre sur la base d'un réseau non terrestre dans un système de communication sans fil
WO2023014168A1 (fr) Procédé et appareil d'attribution d'une ressource de canal de commande de liaison montante dans un système de communication sans fil
WO2021193995A1 (fr) Procédé permettant de recevoir un signal dans un système de communication sans fil prenant en charge une liaison latérale, et dispositif associé

Legal Events

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

Ref document number: 23907730

Country of ref document: EP

Kind code of ref document: A1

WWE Wipo information: entry into national phase

Ref document number: 2501004163

Country of ref document: TH

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 23907730

Country of ref document: EP

Kind code of ref document: A1