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WO2025048585A1 - Procédé et appareil d'établissement de communication basée sur des trajets multiples dans un système de communication sans fil - Google Patents

Procédé et appareil d'établissement de communication basée sur des trajets multiples dans un système de communication sans fil Download PDF

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Publication number
WO2025048585A1
WO2025048585A1 PCT/KR2024/013179 KR2024013179W WO2025048585A1 WO 2025048585 A1 WO2025048585 A1 WO 2025048585A1 KR 2024013179 W KR2024013179 W KR 2024013179W WO 2025048585 A1 WO2025048585 A1 WO 2025048585A1
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Prior art keywords
path
terminal
indirect
base station
indirect path
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English (en)
Korean (ko)
Inventor
이영대
백서영
서한별
이승민
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LG Electronics Inc
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LG Electronics Inc
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/08—Testing, supervising or monitoring using real traffic
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W40/00—Communication routing or communication path finding
    • H04W40/02—Communication route or path selection, e.g. power-based or shortest path routing
    • H04W40/12—Communication route or path selection, e.g. power-based or shortest path routing based on transmission quality or channel quality
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/18—Management of setup rejection or failure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/22—Manipulation of transport tunnels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/23—Manipulation of direct-mode connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H04W88/04—Terminal devices adapted for relaying to or from another terminal or user
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/16—Interfaces between hierarchically similar devices
    • H04W92/18—Interfaces between hierarchically similar devices between terminal devices

Definitions

  • the present disclosure relates to a wireless communication system, and more particularly, to a method and device for performing multi-path based communication in a wireless communication system.
  • Mobile communication systems were developed to provide voice services while ensuring user activity.
  • mobile communication systems have expanded their scope to include data services as well as voice, and currently, due to the explosive increase in traffic, resource shortages are occurring and users are demanding higher-speed services, so more advanced mobile communication systems are required.
  • next generation mobile communication system The requirements for the next generation mobile communication system are that it should be able to accommodate explosive data traffic, dramatically increase the data rate per user, accommodate a greatly increased number of connected devices, support very low end-to-end latency, and support high energy efficiency.
  • various technologies are being studied, including dual connectivity, massive multiple input multiple output (MIMO), in-band full duplex, non-orthogonal multiple access (NOMA), super wideband support, and device networking.
  • the technical problem of the present disclosure relates to a method and device for performing multipath-based communication in a wireless communication system.
  • the technical problem of the present disclosure relates to a method and device for transmitting and receiving data through one or more indirect paths and/or one or more direct paths.
  • the technical problem of the present disclosure relates to a method and a device for activating or deactivating one or more indirect paths and/or direct paths depending on a measurement result.
  • a method performed by a first terminal in a wireless communication system includes the steps of: receiving, from a base station, first configuration information related to a direct path and at least one indirect path; and activating or deactivating the direct path or the at least one indirect path based on at least one measurement value acquired by the first terminal satisfying at least one condition, wherein the first configuration information may include first information related to whether activation or deactivation of the direct path or the at least one indirect path is permitted based on the at least one measurement value.
  • a method performed by a base station in a wireless communication system includes the steps of: transmitting first configuration information related to a direct path and at least one indirect path to a first terminal; and receiving information about activation or deactivation of the direct path or the at least one indirect path from the first terminal based on at least one measurement value acquired by the first terminal satisfying at least one condition, wherein the first configuration information may include first information related to whether activation or deactivation of the direct path or the at least one indirect path is allowed based on the at least one measurement value.
  • a method and apparatus for performing multipath-based communication in a wireless communication system can be provided.
  • methods and devices for transmitting and receiving data via one or more indirect paths and/or one or more direct paths can be provided.
  • establishment and activation/deactivation of multiple indirect paths can be supported, and various forms of multi-paths can be established/supported depending on the channel environment.
  • Figure 1 illustrates the structure of a wireless communication system to which the present disclosure can be applied.
  • FIG. 2 illustrates a frame structure in a wireless communication system to which the present disclosure can be applied.
  • FIG. 3 illustrates a resource grid in a wireless communication system to which the present disclosure can be applied.
  • FIG. 4 illustrates a physical resource block in a wireless communication system to which the present disclosure can be applied.
  • FIG. 6 illustrates physical channels used in a wireless communication system to which the present disclosure can be applied and a general signal transmission and reception method using the same.
  • FIG. 7 illustrates a procedure for performing V2X or SL communication according to a transmission mode in a wireless communication system to which the present disclosure can be applied.
  • FIG. 8 illustrates a user plane protocol stack for a U2N (UE-to-network) relay procedure in a wireless communication system to which the present disclosure can be applied.
  • U2N UE-to-network
  • FIG. 9 illustrates a control plane protocol stack for a U2N relay procedure in a wireless communication system to which the present disclosure can be applied.
  • FIG. 10 is a diagram for explaining a process in which a first terminal performs communication according to one embodiment of the present disclosure.
  • FIG. 11 is a diagram for explaining a process in which a base station performs communication according to one embodiment of the present disclosure.
  • FIG. 12 is a diagram for explaining a multi-path scenario according to one embodiment of the present disclosure.
  • FIG. 13 is a diagram for explaining the configuration of a MAC CE according to one embodiment of the present disclosure.
  • FIG. 14 illustrates a block diagram of a wireless communication device according to one embodiment of the present disclosure.
  • first in one embodiment
  • second component in another embodiment
  • first component in another embodiment may be referred to as a first component in another embodiment
  • the present disclosure describes a wireless communication network or a wireless communication system, and an operation performed in a wireless communication network may be performed in a process of controlling the network and transmitting or receiving a signal from a device (e.g., a base station) that manages the wireless communication network, or in a process of transmitting or receiving a signal with or between terminals connected to the wireless network.
  • a device e.g., a base station
  • transmitting or receiving a channel means transmitting or receiving information or a signal through the channel.
  • transmitting a control channel means transmitting control information or a signal through the control channel.
  • transmitting a data channel means transmitting data information or a signal through the data channel.
  • downlink means communication from a base station to a terminal
  • uplink means communication from a terminal to a base station.
  • a transmitter may be part of a base station, and a receiver may be part of a terminal.
  • a transmitter may be part of a terminal, and a receiver may be part of a base station.
  • the base station may be expressed as a first communication device, and the terminal may be expressed as a second communication device.
  • a base station may be replaced by terms such as a fixed station, a Node B, an evolved-NodeB (eNB), a Next Generation NodeB (gNB), a base transceiver system (BTS), an Access Point (AP), a network (5G network), an Artificial Intelligence (AI) system/module, a road side unit (RSU), a robot, a drone (UAV: Unmanned Aerial Vehicle), an Augmented Reality (AR) device, and a Virtual Reality (VR) device.
  • BS base station
  • eNB evolved-NodeB
  • gNB Next Generation NodeB
  • BTS Next Generation NodeB
  • AP Access Point
  • 5G network 5G network
  • AI Artificial Intelligence
  • RSU road side unit
  • robot a drone
  • UAV Unmanned Aerial Vehicle
  • AR Augmented Reality
  • VR Virtual Reality
  • the terminal may be fixed or mobile, and may be replaced with terms such as UE (User Equipment), MS (Mobile Station), UT (user terminal), MSS (Mobile Subscriber Station), SS (Subscriber Station), AMS (Advanced Mobile Station), WT (Wireless terminal), MTC (Machine-Type Communication) device, M2M (Machine-to-Machine) device, D2D (Device-to-Device) device, vehicle, RSU (road side unit), robot, AI (Artificial Intelligence) module, UAV (Unmanned Aerial Vehicle), AR (Augmented Reality) device, and VR (Virtual Reality) device.
  • UE User Equipment
  • MS Mobile Station
  • UT user terminal
  • MSS Mobile Subscriber Station
  • SS Subscriber Station
  • AMS Advanced Mobile Station
  • WT Wireless terminal
  • MTC Machine-Type Communication
  • M2M Machine-to-Machine
  • D2D Device-to-Device
  • vehicle RSU (road side unit)
  • CDMA can be implemented with wireless technologies such as UTRA (Universal Terrestrial Radio Access) or CDMA2000.
  • TDMA can be implemented with wireless technologies such as GSM (Global System for Mobile communications)/GPRS (General Packet Radio Service)/EDGE (Enhanced Data Rates for GSM Evolution).
  • OFDMA can be implemented with wireless technologies such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, E-UTRA (Evolved UTRA).
  • Wi-Fi IEEE 802.11
  • WiMAX IEEE 802.16
  • IEEE 802-20 E-UTRA
  • Evolved UTRA Evolved UTRA.
  • UTRA is a part of UMTS (Universal Mobile Telecommunications System).
  • 3GPP(3rd Generation Partnership Project) LTE(Long Term Evolution) is a part of E-UMTS(Evolved UMTS) that uses E-UTRA
  • LTE-A(Advanced)/LTE-A pro is an evolved version of 3GPP LTE
  • 3GPP NR(New Radio or New Radio Access Technology) is an evolved version of 3GPP LTE/LTE-A/LTE-A pro.
  • LTE refers to technology after 3GPP TS (Technical Specification) 36.xxx Release 8.
  • LTE technology after 3GPP TS 36.xxx Release 10 is referred to as LTE-A
  • LTE technology after 3GPP TS 36.xxx Release 13 is referred to as LTE-A pro
  • 3GPP NR refers to technology after TS 38.xxx Release 15.
  • LTE/NR may be referred to as a 3GPP system.
  • xxx refers to a standard document detail number.
  • LTE/NR may be collectively referred to as a 3GPP system.
  • 3GPP 3rd Generation Partnership Project
  • TS 36.211 Physical channels and modulation
  • TS 36.212 Multiplexing and channel coding
  • TS 36.213 Physical layer procedures
  • TS 36.300 General description
  • TS 36.331 Radio resource control
  • TS 38.211 Physical channels and modulation
  • TS 38.212 Multiplexing and channel coding
  • TS 38.213 Physical layer procedures for control
  • TS 38.214 Physical layer procedures for data
  • TS 38.300 Overall description of NR and New Generation-Radio Access Network (NG-RAN)
  • TS 38.331 Radio Resource Control protocol specification
  • Synchronization signal block including primary synchronization signal (PSS), secondary synchronization signal (SSS), and physical broadcast channel (PBCH)
  • PSS primary synchronization signal
  • SSS secondary synchronization signal
  • PBCH physical broadcast channel
  • next-generation communications which connects a large number of devices and objects to provide various services anytime and anywhere, is also one of the major issues to be considered in next-generation communications.
  • RAT radio access technology
  • massive MTC machine type communications
  • Mmtc massive MTC
  • URLLC ultra-reliable and low latency communication
  • the new RAT system including NR uses OFDM transmission scheme or similar transmission scheme.
  • the new RAT system may follow OFDM parameters different from those of LTE.
  • the new RAT system may follow the existing LTE/LTE-A numerology but support a larger system bandwidth (e.g., 100MHz).
  • a single cell may support multiple numerologies. That is, terminals operating with different numerologies may coexist in a single cell.
  • a numerology corresponds to one subcarrier spacing in the frequency domain.
  • Different numerologies can be defined by scaling the reference subcarrier spacing by an integer N.
  • Figure 1 illustrates the structure of a wireless communication system to which the present disclosure can be applied.
  • the NG-RAN consists of gNBs providing NG-RA (NG-Radio Access) user plane (i.e., new AS (access stratum) sublayer/PDCP (packet data convergence protocol)/RLC (radio link control)/MAC/PHY) and control plane (RRC) protocol termination for UE.
  • NG-RA NG-Radio Access
  • PDCP packet data convergence protocol
  • RLC radio link control
  • RRC control plane
  • the gNBs are interconnected via Xn interface.
  • the gNBs are also connected to NGC (New Generation Core) via NG interface. More specifically, the gNBs are connected to AMF (Access and Mobility Management Function) via N2 interface and to UPF (User Plane Function) via N3 interface.
  • AMF Access and Mobility Management Function
  • UPF User Plane Function
  • FIG. 2 illustrates a frame structure in a wireless communication system to which the present disclosure can be applied.
  • NR system can support multiple numerologies, where the numerology can be defined by subcarrier spacing and cyclic prefix (CP) overhead.
  • multiple subcarrier spacings can be derived by scaling the base (reference) subcarrier spacing by an integer N (or ⁇ ).
  • N or ⁇
  • the numerology used can be selected independently of the frequency band.
  • NR system can support various frame structures according to multiple numerologies.
  • OFDM numerologies and frame structures that can be considered in NR systems.
  • a number of OFDM numerologies supported in NR systems can be defined as shown in Table 1 below.
  • NR supports multiple numerologies (or subcarrier spacing (SCS)) to support various 5G services. For example, when the SCS is 15 kHz, it supports a wide area in traditional cellular bands, when the SCS is 30 kHz/60 kHz, it supports dense-urban, lower latency, and wider carrier bandwidth, and when the SCS is 60 kHz or higher, it supports a bandwidth larger than 24.25 GHz to overcome phase noise.
  • the NR frequency band is defined by two types of frequency ranges (FR1, FR2).
  • FR1 and FR2 can be configured as shown in Table 2 below.
  • FR2 can mean millimeter wave (mmW).
  • slots are numbered in increasing order of n s ⁇ ⁇ 0,..., N slot subframe, ⁇ -1 ⁇ within a subframe, and in increasing order of n s,f ⁇ ⁇ 0,..., N slot frame, ⁇ -1 ⁇ within a radio frame.
  • One slot consists of consecutive OFDM symbols of N symb slot , where N symb slot is determined according to a CP.
  • the start of slot n s ⁇ in a subframe is temporally aligned with the start of OFDM symbol n s ⁇ N symb slot in the same subframe. Not all terminals can transmit and receive simultaneously, which means that not all OFDM symbols in a downlink slot or uplink slot can be utilized.
  • Table 3 shows the number of OFDM symbols per slot (N symb slot ), the number of slots per radio frame (N slot frame, ⁇ ), and the number of slots per subframe (N slot subframe, ⁇ ) in the general CP
  • Table 4 shows the number of OFDM symbols per slot, the number of slots per radio frame, and the number of slots per subframe in the extended CP.
  • a mini-slot can include 2, 4, or 7 symbols, or more or fewer symbols.
  • an antenna port, a resource grid, a resource element, a resource block, a carrier part, etc. can be considered.
  • an antenna port is defined such that a channel on which a symbol on the antenna port is carried can be inferred from a channel on which another symbol on the same antenna port is carried. If a large-scale property of a channel on which a symbol on one antenna port is carried can be inferred from a channel on which a symbol on another antenna port is carried, the two antenna ports can be said to be in a QC/QCL (quasi co-located or quasi co-location) relationship.
  • the large-scale property includes one or more of delay spread, Doppler spread, frequency shift, average received power, and received timing.
  • a resource grid is exemplarily described as consisting of N RB ⁇ N sc RB subcarriers in the frequency domain and one subframe consisting of 14 ⁇ 2 ⁇ OFDM symbols, but is not limited thereto.
  • a transmitted signal is described by one or more resource grids consisting of N RB ⁇ N sc RB subcarriers and OFDM symbols of 2 ⁇ N symb ( ⁇ ) .
  • N RB ⁇ ⁇ N RB max, ⁇ The N RB max, ⁇ represents a maximum transmission bandwidth, which may vary between uplink and downlink as well as numerologies.
  • one resource grid may be configured for ⁇ and each antenna port p.
  • Each element of the resource grid for ⁇ and each antenna port p is referred to as a resource element and is uniquely identified by an index pair (k,l').
  • l' 0,...,2 ⁇ N symb ( ⁇ ) -1 designates the position of a symbol within a subframe.
  • an index pair (k,l) is used.
  • l 0,...,N symb ⁇ -1.
  • the resource element (k,l') for ⁇ and antenna port p corresponds to a complex value a k,l' (p, ⁇ ) .
  • indices p and ⁇ can be dropped, resulting in a complex value a k,l' (p) or a k,l' .
  • Point A serves as a common reference point of the resource block grid and is obtained as follows.
  • - offsetToPointA for Primary Cell (PCell) downlink indicates the frequency offset between point A and the lowest subcarrier of the lowest resource block overlapping with the SS/PBCH block used by the UE for initial cell selection. It is expressed in resource block units assuming 15 kHz subcarrier spacing for FR1 and 60 kHz subcarrier spacing for FR2.
  • - absoluteFrequencyPointA represents the frequency-position of point A expressed as ARFCN (absolute radio-frequency channel number).
  • Common resource blocks are numbered from 0 upward in the frequency domain for the subcarrier spacing setting ⁇ .
  • the center of subcarrier 0 of common resource block 0 for the subcarrier spacing setting ⁇ coincides with 'point A'.
  • the relationship between common resource block number n CRB ⁇ in the frequency domain and resource elements (k, l) for the subcarrier spacing setting ⁇ is given by the following mathematical expression 1.
  • the physical resource blocks are numbered from 0 to N BWP,i size, ⁇ -1 within a bandwidth part (BWP), where i is the number of the BWP.
  • BWP bandwidth part
  • Equation 2 The relationship between a physical resource block n PRB and a common resource block n CRB in a BWP i is given by Equation 2 below.
  • N BWP,i start, ⁇ is the common resource block where the BWP starts relative to common resource block 0.
  • FIG. 4 illustrates a physical resource block in a wireless communication system to which the present disclosure can be applied.
  • FIG. 5 illustrates a slot structure in a wireless communication system to which the present disclosure can be applied.
  • a slot includes multiple symbols in the time domain. For example, in the case of normal CP, one slot includes 7 symbols, but in the case of extended CP, one slot includes 6 symbols.
  • a carrier includes multiple subcarriers in the frequency domain.
  • An RB Resource Block
  • a BWP Bandwidth Part
  • a carrier can include up to N (e.g., 5) BWPs. Data communication is performed through activated BWPs, and only one BWP can be activated for one terminal.
  • Each element in the resource grid is referred to as a Resource Element (RE), and one complex symbol can be mapped.
  • RE Resource Element
  • the NR system can support up to 400 MHz per component carrier (CC). If a terminal operating in such a wideband CC always operates with the radio frequency (RF) chip for the entire CC turned on, the terminal battery consumption may increase. Or, when considering multiple use cases (e.g., eMBB, URLLC, Mmtc, V2X, etc.) operating in a single wideband CC, different numerologies (e.g., subcarrier spacing, etc.) may be supported for each frequency band within the CC. Or, the capability for maximum bandwidth may be different for each terminal.
  • eMBB enhanced mobile broadband
  • the base station may instruct the terminal to operate only in a part of the bandwidth rather than the entire bandwidth of the wideband CC, and the part of the bandwidth is conveniently defined as the bandwidth part (BWP).
  • a BWP can be composed of consecutive RBs on the frequency axis and can correspond to one numerology (e.g., subcarrier spacing, CP length, slot/mini-slot interval).
  • the base station can set multiple BWPs even within one CC set for the terminal. For example, in the PDCCH monitoring slot, a BWP that occupies a relatively small frequency domain can be set, and the PDSCH indicated by the PDCCH can be scheduled on a larger BWP.
  • the base station can set at least one DL/UL BWP for a terminal associated with a wideband CC.
  • the base station can activate (by L1 signaling or MAC CE (Control Element) or RRC signaling, etc.) at least one DL/UL BWP among the DL/UL BWP(s) configured at a specific point in time.
  • the base station can instruct switching to another configured DL/UL BWP (by L1 signaling or MAC CE or RRC signaling, etc.).
  • switching to a determined DL/UL BWP may be performed when a timer value expires based on a timer.
  • the activated DL/UL BWP is defined as an active DL/UL BWP.
  • the DL/UL BWP assumed by the UE in such a situation is defined as an initially active DL/UL BWP.
  • FIG. 6 illustrates physical channels used in a wireless communication system to which the present disclosure can be applied and a general signal transmission and reception method using the same.
  • a terminal receives information from a base station through a downlink, and the terminal transmits information to the base station through an uplink.
  • the information transmitted and received by the base station and the terminal includes data and various control information, and various physical channels exist depending on the type/purpose of the information they transmit and receive.
  • the terminal When the terminal is powered on or enters a new cell, it performs an initial cell search operation such as synchronizing with the base station (S601). To this end, the terminal can receive a primary synchronization signal (PSS) and a secondary synchronization signal (PSS) from the base station to synchronize with the base station and obtain information such as a cell identifier (ID). Thereafter, the terminal can receive a physical broadcast channel (PBCH) from the base station to obtain broadcast information within the cell. Meanwhile, the terminal can receive a downlink reference signal (DL RS) in the initial cell search phase to check the downlink channel status.
  • PSS primary synchronization signal
  • PSS secondary synchronization signal
  • ID cell identifier
  • PBCH physical broadcast channel
  • DL RS downlink reference signal
  • a terminal that has completed an initial cell search can obtain more specific system information by receiving a physical downlink control channel (PDCCH) and a physical downlink shared channel (PDSCH) according to information carried on the PDCCH (S602).
  • PDCCH physical downlink control channel
  • PDSCH physical downlink shared channel
  • the terminal may perform a random access procedure (RACH) for the base station (steps S603 to S606).
  • RACH random access procedure
  • the terminal may transmit a specific sequence as a preamble through a random access channel (RACH) (S603 and S605), and receive a response message to the preamble through a PDCCH and a corresponding PDSCH (S604 and S606).
  • RACH random access channel
  • a contention resolution procedure may additionally be performed.
  • the terminal that has performed the procedure as described above can then perform PDCCH/PDSCH reception (S607) and physical uplink shared channel (PUSCH)/physical uplink control channel (PUCCH) transmission (S608) as general uplink/downlink signal transmission procedures.
  • the terminal receives downlink control information (DCI) through the PDCCH.
  • DCI downlink control information
  • the DCI includes control information such as resource allocation information for the terminal, and its format is different depending on the purpose of use.
  • the control information that the terminal transmits to the base station via uplink or that the terminal receives from the base station includes downlink/uplink ACK/NACK (Acknowledgement/Non-Acknowledgement) signals, CQI (Channel Quality Indicator), PMI (Precoding Matrix Indicator), RI (Rank Indicator), etc.
  • the terminal can transmit the above-described control information such as CQI/PMI/RI via PUSCH and/or PUCCH.
  • Table 5 shows an example of DCI format in the NR system.
  • DCI formats 0_0, 0_1, and 0_2 may include resource information related to PUSCH scheduling (e.g., UL/SUL (Supplementary UL), frequency resource allocation, time resource allocation, frequency hopping, etc.), transport block (TB) related information (e.g., MCS (Modulation Coding and Scheme), NDI (New Data Indicator), RV (Redundancy Version), etc.), HARQ (Hybrid - Automatic Repeat and request) related information (e.g., process number, DAI (Downlink Assignment Index), PDSCH-HARQ feedback timing, etc.), multi-antenna related information (e.g., DMRS sequence initialization information, antenna port, CSI request, etc.), power control information (e.g., PUSCH power control, etc.), and the control information included in each DCI format may be predefined.
  • PUSCH scheduling e.g., UL/SUL (Supplementary UL), frequency resource allocation, time resource allocation, frequency
  • DCI format 0_0 is used for scheduling PUSCH in a cell.
  • Information included in DCI format 0_0 is transmitted with CRC (cyclic redundancy check) scrambled by C-RNTI (cell radio network temporary identifier, Cell RNTI) or CS-RNTI (Configured Scheduling RNTI) or MCS-C-RNTI (Modulation Coding Scheme Cell RNTI).
  • C-RNTI cell radio network temporary identifier, Cell RNTI
  • CS-RNTI Configured Scheduling RNTI
  • MCS-C-RNTI Modulation Coding Scheme Cell RNTI
  • DCI format 0_1 is used to indicate scheduling of one or more PUSCHs in a cell, or configure grant (CG) downlink feedback information to the UE.
  • the information included in DCI format 0_1 is transmitted by CRC scrambled by C-RNTI or CS-RNTI or SP-CSI-RNTI (Semi-Persistent CSI RNTI) or MCS-C-RNTI.
  • DCI format 0_2 is used for scheduling PUSCH in a cell.
  • Information included in DCI format 0_2 is transmitted by CRC scrambled by C-RNTI or CS-RNTI or SP-CSI-RNTI or MCS-C-RNTI.
  • DCI formats 1_0, 1_1, and 1_2 may include resource information related to scheduling of PDSCH (e.g., frequency resource allocation, time resource allocation, virtual resource block (VRB)-physical resource block (PRB) mapping, etc.), transport block (TB) related information (e.g., MCS, NDI, RV, etc.), HARQ related information (e.g., process number, DAI, PDSCH-HARQ feedback timing, etc.), multi-antenna related information (e.g., antenna port, transmission configuration indicator (TCI), sounding reference signal (SRS) request, etc.), PUCCH related information (e.g., PUCCH power control, PUCCH resource indicator, etc.), and control information included in each DCI format may be predefined.
  • resource information related to scheduling of PDSCH e.g., frequency resource allocation, time resource allocation, virtual resource block (VRB)-physical resource block (PRB) mapping, etc.
  • transport block (TB) related information e.g., MCS, ND
  • DCI format 1_0 is used for scheduling PDSCH in one DL cell.
  • Information included in DCI format 1_0 is transmitted CRC scrambled by C-RNTI or CS-RNTI or MCS-C-RNTI.
  • DCI format 1_1 is used for scheduling PDSCH in one cell.
  • Information included in DCI format 1_1 is transmitted by CRC scrambled by C-RNTI or CS-RNTI or MCS-C-RNTI.
  • DCI format 1_2 is used for scheduling PDSCH in a cell.
  • Information included in DCI format 1_2 is transmitted by CRC scrambled by C-RNTI or CS-RNTI or MCS-C-RNTI.
  • V2X vehicle-to-everything
  • SL sidelink
  • FIG. 7 illustrates a procedure for performing V2X or SL communication according to a transmission mode in a wireless communication system to which the present disclosure can be applied.
  • the transmission mode can be referred to as a mode or a resource allocation mode.
  • the transmission mode in LTE can be referred to as an LTE transmission mode
  • the transmission mode in NR can be referred to as an NR resource allocation mode.
  • Fig. 7(a) illustrates the operation of a UE related to LTE transmission mode 1 or LTE transmission mode 3.
  • Fig. 7(a) illustrates the operation of a UE related to NR resource allocation mode 1.
  • LTE transmission mode 1 can be applied to general SL communication
  • LTE transmission mode 3 can be applied to V2X communication.
  • Fig. 7(b) illustrates the operation of a UE associated with LTE transmission mode 2 or LTE transmission mode 4.
  • Fig. 7(b) illustrates the operation of a UE associated with NR resource allocation mode 2.
  • the base station can schedule SL resources to be used by the UE for SL transmission (S8000).
  • the base station can transmit information related to SL resources and/or information related to UL resources to the first UE.
  • the UL resources can include PUCCH resources and/or PUSCH resources.
  • the UL resources can be resources for reporting SL HARQ feedback to the base station.
  • the first UE may receive information related to a dynamic grant (DG) resource and/or information related to a configured grant (CG) resource from the base station.
  • the CG resource may include a CG type 1 resource or a CG type 2 resource.
  • the DG resource may be a resource that the base station configures/allocates to the first UE via DCI.
  • the CG resource may be a (periodic) resource that the base station configures/allocates to the first UE via DCI and/or an RRC message.
  • the base station may transmit an RRC message including information related to the CG resource to the first UE.
  • the base station may transmit an RRC message including information related to the CG resource to the first UE, and the base station may transmit DCI related to activation or release of the CG resource to the first UE.
  • the first UE may transmit PSCCH (e.g., Sidelink Control Information (SCI) or 1st-stage SCI) to the second UE based on the resource scheduling (S8010).
  • PSCCH e.g., Sidelink Control Information (SCI) or 1st-stage SCI
  • the first UE can transmit a PSSCH (e.g., a 2nd-stage SCI, a MAC protocol data unit (PDU), data, etc.) related to the PSCCH to the second UE (S8020).
  • a PSSCH e.g., a 2nd-stage SCI, a MAC protocol data unit (PDU), data, etc.
  • the first UE can receive a PSFCH related to the PSCCH/PSSCH from the second UE (S8030).
  • HARQ feedback information e.g., NACK information or ACK information
  • NACK information or ACK information can be received from the second UE via the PSFCH.
  • the first UE can transmit/report HARQ feedback information to the base station via PUCCH or PUSCH (S8040).
  • the HARQ feedback information reported to the base station may be information generated by the first UE based on HARQ feedback information received from the second UE.
  • the HARQ feedback information reported to the base station may be information generated by the first UE based on a rule set in advance.
  • the DCI may be DCI for scheduling of SL.
  • the format of the DCI may be DCI format 3_0 or DCI format 3_1.
  • the UE in LTE transmission mode 2, LTE transmission mode 4 or NR resource allocation mode 2, can determine SL transmission resources within SL resources configured by a base station/network or preset SL resources.
  • the configured SL resources or preset SL resources may be a resource pool.
  • the UE can autonomously select or schedule resources for SL transmission.
  • the UE can perform SL communication by selecting resources by itself within the configured resource pool.
  • the UE can perform sensing and resource (re)selection procedures to select resources by itself within a selection window.
  • the sensing may be performed on a sub-channel basis.
  • a first UE that has selected a resource within a resource pool can transmit a PSCCH (e.g., SCI or 1st-stage SCI) to a second UE using the resource (S8010).
  • a PSCCH e.g., SCI or 1st-stage SCI
  • the first UE can transmit a PSSCH (e.g., 2nd-stage SCI, MAC PDU, data, etc.) related to the PSCCH to the second UE (S8020).
  • a PSSCH e.g., 2nd-stage SCI, MAC PDU, data, etc.
  • the first UE can receive a PSFCH related to the PSCCH/PSSCH from the second UE (S8030).
  • a first UE may transmit an SCI to a second UE on a PSCCH.
  • the first UE may transmit two consecutive SCIs (e.g., 2-stage SCIs) to the second UE on the PSCCH and/or the PSSCH.
  • the second UE may decode the two consecutive SCIs (e.g., 2-stage SCIs) to receive the PSSCH from the first UE.
  • the SCI transmitted on the PSCCH may be referred to as a first (1st) SCI, a first SCI, a first-stage SCI, or a 1st-stage SCI format
  • the SCI transmitted on the PSSCH may be referred to as a second (2 nd ) SCI, a second SCI, a second-stage (2nd-stage) SCI, or a 2nd-stage SCI format
  • a 1st-stage SCI format may include SCI format 1-A
  • a 2nd-stage SCI format may include SCI format 2-A and/or SCI format 2-B.
  • the first UE may receive a PSFCH based on the description to be described below.
  • the first UE and the second UE may determine a PSFCH resource based on the description to be described below, and the second UE may transmit HARQ feedback to the first UE using the PSFCH resource.
  • the SL Relay procedure is introduced to support 5G ProSe U2N relay functionality to provide network connectivity for U2N (UE-to-network) remote terminals. That is, both L2 and L3 U2N relay architectures can be supported.
  • a U2N relay terminal may be in RRC_CONNECTED state to perform relaying of unicast data.
  • RRC_CONNECTED For L2 U2N relay operation, the following RRC state combinations may be supported:
  • the U2N relay terminal can be in RRC_IDLE, RRC_INACTIVE or RRC_CONNECTED state.
  • the U2N remote terminal may be configured to use only resource allocation mode 2 for data to be relayed.
  • a single unicast link can be established between a L2 U2N relay terminal and a L2 U2N remote terminal.
  • the traffic of a U2N remote terminal through a specific U2N relay terminal and the traffic of the U2N relay terminal must be separated into different Uu RLC channels through Uu.
  • the relay terminal can provide network connection to the U2N remote terminal(s).
  • the remote terminal may not have a direct connection to the network while maintaining an indirect connection based on the U2N relay function.
  • the protocol stacks for the user plane and the control plane of the L2 U2N relay architecture can be configured as shown in FIG. 8 and FIG. 9, respectively.
  • the sidelink relay adaptation protocol (SRAP) sublayer can be placed above the RLC sublayer for both the control plane (CP) and the user plane (UP) on both the PC5 interface and the Uu interface.
  • SRAP sidelink relay adaptation protocol
  • the Uu SDAP service data adaptation protocol
  • PDCP packet data convergence protocol
  • RRC packet data convergence protocol
  • SRAP RLC, MAC, and PHY
  • SRAP sublayer over PC5 hop can be used only for bearer mapping purpose.
  • SRAP sublayer for relaying messages of L2 U2N remote terminal over BCCH and PCCH may not exist over PC5 hop.
  • SRB signaling radio bearer
  • SRAP sublayer does not exist over PC5 hop, but SRAP sublayer may exist over Uu hop for both DL and UL.
  • SRB0 can be used for transmission of RRC messages associated with common control channel (CCCH) logical channel.
  • CCCH common control channel
  • the Uu SRAP sublayer in the uplink in a L2 U2N relay procedure, can support UL bearer mapping between a receiving PC5 relay RLC channel and a transmitting Uu relay RLC channel for relaying over a L2 U2N relay terminal Uu interface.
  • different end-to-end RBs e.g., SRBs or data radio bearers (DRBs)
  • DRBs data radio bearers
  • the Uu SRAP sublayer can support L2 U2N remote terminal identification for UL traffic.
  • the identification information of the L2 U2N remote terminal Uu radio bearer and the local remote terminal ID may be included in the Uu SRAP header in UL for the base station to correlate received packets for a particular PDCP entity associated with the correct Uu radio bearer of the remote terminal.
  • the PC5 SRAP sublayer of the L2 U2N remote terminal may support UL bearer mapping between the remote terminal Uu radio bearer and the egress PC5 relay RLC channel.
  • the Uu SRAP lower layer can support DL bearer mapping at the base station to map SRBs, DRBs (i.e., end-to-end radio bearers) of remote terminals to Uu relay RLC channels via the relay terminal Uu interface.
  • the Uu SRAP sublayer may support DL bearer mapping and data multiplexing between multiple end-to-end radio bearers (i.e., SRBs or DRBs) of L2 U2N remote terminals and/or between one Uu relay RLC channel over a relay terminal Uu interface.
  • SRBs or DRBs multiple end-to-end radio bearers
  • the Uu SRAP sublayer may support remote UE identification for DL traffic.
  • the identification information of the remote terminal Uu radio bearer and the local remote terminal ID may be included in the Uu SRAP header by the base station in the DL.
  • the PC5 SRAP sublayer of the relay terminal may support DL bearer mapping between the ingress Uu relay RLC channel and the egress PC5 relay RLC channel.
  • the PC5 SRAP sublayer of the remote terminal can correlate the received packet to a specific PDCP entity associated with the correct Uu radio bearer of the remote terminal based on the identification information contained in the Uu SRAP header.
  • the local remote terminal ID can be included in both the PC5 SRAP header and the Uu SRAP header.
  • the L2 U2N relay terminal can be configured by the base station with a local remote terminal ID to be used in the SRAP header.
  • the remote terminal can obtain the local remote ID from the base station via Uu RRC messages including RRCSetup, RRCReconfiguration, RRCResume and RRCRefoundment.
  • Uu DRB(s) and Uu SRB(s) can be mapped to different PC5 relay RLC channels and Uu relay RLC channels in both PC5 hop and Uu hop.
  • the base station can update the local remote terminal ID by sending the updated local remote ID to the relay terminal via the RRCReconfiguration message.
  • the serving base station can perform the local remote terminal ID update independently of the PC5 unicast link L2 ID update procedure.
  • the relay terminal when the U2N relay function is set for a relay terminal and a remote terminal, the relay terminal can provide a network connection to the U2N remote terminal(s). At this time, the remote terminal may not have a direct connection with the network while maintaining an indirect connection based on the U2N relay function.
  • a remote terminal may support multi-path operation by maintaining direct connections only to Uu, as well as indirect connections based on PC5 and Uu.
  • a remote terminal configured for multi-path operation may select at least one of the multiple connections for data transmission toward the network.
  • a remote terminal In a basic wireless communication system, a remote terminal must maintain both paths regardless of which path is used for actual data transmission, which may require a large amount of power consumption and terminal complexity.
  • a remote terminal can establish an indirect path and a direct path.
  • the remote terminal on the vehicle does not need to maintain both paths (i.e., the indirect path and the direct path).
  • FIG. 10 is a diagram for explaining a process in which a first terminal performs communication according to one embodiment of the present disclosure.
  • the first terminal may be a remote terminal and the second terminal may be a relay terminal.
  • the first terminal may be a relay terminal and the second terminal may be a remote terminal.
  • a first terminal e.g., a remote terminal
  • an indirect path can be a general term for a path between a remote terminal and a base station that passes through a relay terminal.
  • the second terminal can be replaced with a relay node or/and a satellite node, etc.
  • the first terminal and the second terminal can be connected with a side link, a N3C (non-3GPP connection) (e.g., Wi-Fi, Bluetooth, etc.), a NTN (non-terrestrial network)-based connection, etc.
  • the base station can be replaced with a TN (terrestrial network) node or/and a NTN-based satellite node.
  • the first terminal can receive first configuration information related to a direct path and at least one indirect path from the base station (S1010).
  • the terminal may receive first configuration information from the base station via upper layer signaling (e.g., RRC message and/or SIB, etc.).
  • a direct path and at least one indirect path may be established for the terminal by the first configuration information.
  • the first configuration information may include first information related to whether activation or deactivation of a direct path or at least one indirect path is permitted based on at least one measurement value acquired by the first terminal.
  • the first information may include information on whether the first terminal is allowed to activate/deactivate the direct/indirect path using the measurement value measured/acquired by the first terminal.
  • the base station may set, through the first information, whether to allow the first terminal to autonomously activate/deactivate the direct/indirect path.
  • the first information may not be included in the first configuration information. That is, the terminal may receive the first information from the base station through separate configuration information.
  • the first information may be included in the second configuration information, and the second configuration information may be transmitted and received through upper layer signaling separate from the first configuration information.
  • the first configuration information may include second information related to whether the direct path and the at least one indirect path are initially activated. That is, the second information may indicate/set whether only the direct path is initially activated, only the at least one indirect path is activated, or both the direct path and the at least one indirect path are activated. Of the direct path and the at least one indirect path, the remaining paths except those indicated/set to be initially activated by the second information may be deactivated.
  • the first terminal can activate or deactivate a direct path or at least one indirect path (S1020).
  • At least one measurement value acquired by the first terminal may include at least one of an altitude of the first terminal, a velocity of the first terminal, a cell quality value of a direct path, or a quality value associated with at least one indirect path (e.g., an SL quality value, etc.).
  • At least one condition may include at least one of a first condition related to whether an altitude of the first terminal is equal to or greater than (or greater than) or less than (or less than) a first threshold value, a second condition related to whether a speed of the first terminal is equal to or greater than (or greater than) or less than (or less than) a second threshold value, a third condition related to whether a cell quality value of a direct path is equal to or greater than (or greater than) or less than (or less than) a third threshold value, or a fourth condition related to whether a quality value associated with at least one indirect path is equal to or greater than (or greater than) or less than (or less than) a fourth threshold value.
  • each of the first threshold value, the second threshold value, the third threshold value and/or the fourth threshold value may be set/instructed by the base station or may be defined in advance.
  • the first terminal can monitor whether at least one measurement value satisfies at least one condition described above. If at least one measurement value satisfies at least one condition described above, the first terminal can activate/deactivate the direct path or at least one indirect path.
  • the first condition is a condition on whether the altitude of the first terminal is equal to or greater than a first threshold value. If the altitude of the first terminal satisfies the first condition (i.e., the altitude of the first terminal is equal to or greater than the first threshold value), the first terminal can deactivate a direct path and/or activate at least one indirect path.
  • the first condition is a condition on whether the altitude of the first terminal is less than (or below) a first threshold value. If the altitude of the first terminal satisfies the first condition (i.e., the altitude of the first terminal is less than (or below) the first threshold value), the first terminal can activate the direct path and/or deactivate at least one indirect path.
  • the second condition is a condition on whether the speed of the first terminal is equal to or greater than a first threshold value. If the speed of the first terminal satisfies the second condition (i.e., the speed of the first terminal is equal to or greater than the second threshold value), the first terminal can deactivate the direct path and/or activate at least one indirect path.
  • the second condition is a condition on whether the speed of the first terminal is less than (or below) a first threshold. If the speed of the first terminal satisfies the second condition (i.e., the speed of the first terminal is less than (or below) the second threshold), the first terminal can activate the direct path and/or deactivate at least one indirect path.
  • the third condition is a condition on whether the cell quality value of the direct path is equal to or greater than a third threshold value. If the cell quality value of the direct path satisfies the third condition (i.e., the cell quality value is equal to or greater than the third threshold value), the first terminal can activate the direct path and/or deactivate at least one indirect path.
  • the third condition is a condition on whether the cell quality value of the direct path is less than or equal to a third threshold. If the cell quality value of the direct path satisfies the third condition (i.e., the cell quality value is less than or equal to the third threshold), the first terminal can deactivate the direct path and/or activate at least one indirect path.
  • the fourth condition is a condition on whether a quality value associated with at least one indirect path is equal to or greater than a fourth threshold. If the quality value associated with at least one indirect path satisfies the fourth condition (i.e., the quality value is equal to or greater than the fourth threshold), the first terminal can deactivate the direct path and/or activate at least one indirect path.
  • the fourth condition is a condition on whether a quality value associated with at least one indirect path is less than or equal to a fourth threshold. If the quality value associated with at least one indirect path satisfies the fourth condition (i.e., the quality value is less than or equal to the fourth threshold), the first terminal can activate the direct path and/or deactivate the at least one indirect path.
  • the first terminal may transmit information related to the activation or deactivation to the base station or the second terminal.
  • the information related to the activation or deactivation may include information about the activated or deactivated path, at least one measurement value, or/and a condition/measurement value associated with the activation or deactivation of the path.
  • the first terminal may transmit information related to activation or deactivation to the base station and/or the second terminal via uplink control information (UCI), a medium access control (MAC) control element (CE), or a radio resource control (RRC) message.
  • UCI uplink control information
  • MAC medium access control
  • CE control element
  • RRC radio resource control
  • At least one of a sidelink (SL) bandwidth part (BWP) or a SL configured grant (CG) setting on at least one indirect path may be disabled or released.
  • SL sidelink
  • BWP bandwidth part
  • CG SL configured grant
  • At least one of a semi-persistence scheduling (SPS) setting, a BWP setting, a CG setting, a sounding reference signal (SRS) setting, and a physical uplink control channel (PUCCH) setting related to the direct path may be disabled or released.
  • SPS semi-persistence scheduling
  • BWP BWP
  • CG CG
  • SRS sounding reference signal
  • PUCCH physical uplink control channel
  • the first terminal may perform a random access procedure related to the direct path to transmit information related to the activation to the base station.
  • the first terminal can transmit information related to the activation to the base station and/or the second terminal via the at least one indirect path.
  • the method described in the example of FIG. 10 can be performed by the first device (100) of FIG. 14. That is, the first terminal of FIG. 10 can be implemented as the first device (100).
  • one or more processors (102) of the first device (100) of FIG. 14 can receive first configuration information related to a direct path and at least one indirect path from a base station through one or more transceivers (106).
  • one or more memories (104) of the first device (100) may store instructions for performing the method described in the example of FIG. 14 or the examples described below when executed by one or more processors (102).
  • FIG. 11 is a diagram for explaining a process in which a base station performs communication according to one embodiment of the present disclosure.
  • the base station can transmit first configuration information related to a direct path and at least one indirect path to the terminal (1110).
  • the base station can receive information related to activation or deactivation of a direct path or at least one indirect path from the first terminal (S1120).
  • the direct path or at least one indirect path can be activated or deactivated by the first terminal.
  • the base station can receive information related to the activation or deactivation of the direct path or the at least one indirect path from the first terminal.
  • the method described in the example of FIG. 11 can be performed by the second device (200) of FIG. 14. That is, the base station of FIG. 11 can be implemented by the second device (200).
  • one or more processors (202) of the second device (200) of FIG. 14 can transmit first configuration information related to a direct path and at least one indirect path to a terminal through one or more transceivers (206).
  • the one or more processors (202) can receive information related to activation or deactivation of the direct path or at least one indirect path through one or more transceivers (206).
  • one or more memories (204) of the second device (200) may store instructions for performing the method described in the example of FIG. 11 or the examples described below when executed by one or more processors (202).
  • FIG. 12 is a diagram for explaining a multi-path scenario according to one embodiment of the present disclosure.
  • the first terminal is a terminal device used by a user boarding a specific means of transportation (e.g., an airplane, a ship, a plane, etc.), and the second terminal may be mounted on UAM (unmanned aerial mobility).
  • UAM unmanned aerial mobility
  • the first terminal and the second terminal may be connected via sidelink or/Wi-Fi-based communication, but is not limited thereto.
  • the first terminal and the second terminal may perform NTN-based communication.
  • the direct path of a multipath relay may provide RRC signals
  • the indirect path of a multipath relay via UAM may provide passenger user data
  • the first terminal, the second terminal, and the base station of FIGS. 10 to 12 can perform operations according to the embodiments described below and combinations of the embodiments described above.
  • the base station can transmit an RRC message to the relay terminal and/or the remote terminal for configuring one or more cells.
  • one or more indirect paths and/or direct paths for the relay terminal can be configured in the one or more cells, and the one or more indirect paths and/or direct paths can be transmitted from the base station via the RRC message.
  • one serving cell can correspond to one direct cell.
  • direct path(s) When direct path(s) are established for multiple serving cells, different direct paths or a single direct path can be established for different serving cells by RRC messages. Different serving cells can be addressed by different serving cell indices in the RRC message.
  • all or a subset of different relay terminals can be established for different indirect paths or a single indirect path by RRC messages.
  • Different direct paths and indirect paths can be addressed with different path indices, and different relay terminals can be addressed with different relay terminal indices in the RRC messages.
  • RRC messages When multiple carriers (e.g., multiple sidelink carriers) are established for an indirect path between a remote terminal and a relay terminal, different carriers or a subset of carriers for different indirect paths or a single indirect path can be established by RRC messages. Different carriers can be addressed by different carrier indices in the RRC messages.
  • a terminal receiving an RRC message can initially set each path to be activated or deactivated as follows.
  • Each configured direct cell can be initially set as an activated cell (or a deactivated cell).
  • Each configured relay terminal can be initially set as an activated relay (or a deactivated relay).
  • Each direct path established can be initially set as an active path (or a disabled path).
  • Each established indirect path can be initially set as an active path (or a disabled path).
  • control information (e.g., MAC CE or DCI) received by a terminal from a base station may indicate at least one of the following information/statuses:
  • Each configured direct cell can be activated or deactivated depending on its serving cell index.
  • Each configured relay terminal can be activated or deactivated depending on its relay terminal index.
  • Each direct route established can be activated or deactivated depending on its route index.
  • Each established indirect path can be activated or deactivated using its path index.
  • a terminal that has received the control information may perform at least one of the following operations.
  • the terminal may activate or deactivate the direct cell corresponding to the serving cell index as indicated.
  • the terminal may activate or deactivate the relay terminal corresponding to the relay terminal index as indicated.
  • the terminal may activate or deactivate the direct path corresponding to the path index as indicated.
  • the terminal may activate or deactivate the indirect path corresponding to the path index as indicated.
  • Example 1-1 relates to a method for activating/deactivating an indirect path/direct path depending on a measurement result.
  • the remote terminal may autonomously activate, deactivate or release the direct path or the indirect path of the multipath relay to the remote terminal as described below, before/after notifying the base station and/or the relay terminal about the detected event and/or the measured Uu cell quality of the direct path and/or the measured SL quality of the indirect path.
  • the remote terminal may disable the direct path and enable the indirect path.
  • the remote terminal may disable the direct path or enable the indirect path.
  • the remote terminal can activate the direct path and deactivate the indirect path.
  • the remote terminal can activate the direct path or deactivate the indirect path.
  • the remote terminal may activate the direct path and deactivate the indirect path.
  • the remote terminal may activate the direct path or deactivate the indirect path.
  • the remote terminal may disable the direct path and enable the indirect path.
  • the remote terminal may disable the direct path or enable the indirect path.
  • the remote terminal may deactivate the direct path and activate the indirect path.
  • the remote terminal may activate the direct path and deactivate the indirect path. If the measured SL quality of the indirect path of the remote terminal or relay terminal is lower than the threshold set by the base station, the remote terminal may activate the direct path or deactivate the indirect path.
  • the relay terminal may activate the indirect path based on a measured SL quality of an indirect path of the remote or relay terminal exceeding the threshold, or/and based on a measured Uu cell quality of a direct path of the remote terminal exceeding the threshold, or/and based on a measured Uu cell quality of an indirect path of the relay terminal exceeding the threshold, or/and upon receiving information from the remote terminal (e.g., information related to the event, etc.).
  • an event e.g., an event related to a comparison between altitude and/or cell quality and a threshold set by a base station
  • the relay terminal may activate the indirect path based on a measured SL quality of an indirect path of the remote or relay terminal exceeding the threshold, or/and based on a measured Uu cell quality of a direct path of the remote terminal exceeding the threshold, or/and based on a measured Uu cell quality of an indirect path of the relay terminal exceeding the threshold, or/and upon receiving information from the remote terminal (e.g., information related to the event, etc.).
  • the relay terminal may deactivate the indirect path based on a measured SL quality of the indirect path from a remote or relay UE below the threshold, or/and based on a measured Uu cell quality of the direct path from a remote UE above the threshold, or/and based on a measured Uu cell quality of the indirect path from a relay UE below the threshold, or/and upon receiving information from the remote terminal (e.g., information related to the above event, etc.).
  • an event as described above e.g., an event related to a comparison between altitude and/or cell quality and a threshold set by the base station
  • the relay terminal may deactivate the indirect path based on a measured SL quality of the indirect path from a remote or relay UE below the threshold, or/and based on a measured Uu cell quality of the direct path from a remote UE above the threshold, or/and based on a measured Uu cell quality of the indirect path from a relay UE below the threshold, or/and upon receiving information from the remote terminal (
  • the remote terminal may receive control information (e.g., MAC CE or DCI) indicating one or more of the following:
  • Each configured direct cell can be activated or deactivated with its serving cell index.
  • Each configured relay terminal can be activated or deactivated with its corresponding relay terminal index.
  • Each direct path configured can be activated or deactivated with its path index.
  • Each configured indirect path can be activated or deactivated with its path index.
  • Embodiment 1-2 relates to the actions performed by the remote terminal after the direct path is deactivated or released. That is, when the direct path is deactivated due to autonomous activation/deactivation or reception of control information from the base station, the remote terminal may deactivate or release the direct path (and the PCell of the direct path) and perform one of the options described below.
  • a remote terminal may regard the PCell of a relay terminal in an indirect path as the PCell of the remote terminal. That is, the PCell of the remote terminal may be changed to the PCell of the relay terminal as described below.
  • the base station may provide a conditional reset to the remote UE and/or the relay terminal for the PCell change before the deactivation of the direct path. Therefore, when the direct path is deactivated, the remote terminal may consider that the condition of the conditional reset is satisfied and may apply the conditional reset to the direct path and the indirect path to perform the PCell change of the remote terminal. When the direct path is deactivated or information is received from the remote terminal, the relay terminal may also consider that the condition of the conditional reset is satisfied and may apply the conditional reset to the indirect path to perform the PCell change of the remote UE.
  • the PCell of the remote terminal is maintained but may be deactivated. That is, the PCell is not changed but may be deactivated as described below.
  • the base station may provide a conditional reset to the remote terminal and/or the relay terminal for the deactivation prior to the deactivation of the direct path. Accordingly, when the direct path is deactivated, the remote terminal may consider that the condition of the conditional reset is satisfied and apply the conditional reset to the direct path and the indirect path. When the direct path is deactivated or information is received from the remote terminal, the relay terminal may also consider that the condition of the conditional reset is satisfied and apply the conditional reset to the indirect path.
  • the remote terminal can change the default path of all split SRBs from the direct path to the indirect path. If the default path of a split DRB is set to the direct path, the default path of the DRB can also be changed to the indirect path.
  • the remote terminal may change from direct SRB to indirect SRB upon conditional reset. If direct path DRB is established, the direct DRB may also change to indirect DRB or be released upon conditional reset.
  • the remote terminal may not perform one or some or all of the following actions:
  • the remote terminal may activate the direct path and report the indirect path failure to the base station. If the remote terminal fails to activate the direct path or fails to report the indirect path failure to the base station, the remote terminal may initiate an RRC connection re-establishment procedure.
  • the remote terminal may initiate an RRC connection re-establishment procedure without activating the direct path.
  • the remote terminal may disable or release the SPS configuration, the CG configuration, the SRS configuration, the active BWP of the direct path, the PUCCH configuration, or/and the supplemental UL carrier.
  • the remote terminal may stop or suspend any timers associated with the direct path.
  • the remote terminal when autonomous activation/deactivation or reception of control information from a base station is applied, the remote terminal may still consider the PCell of the direct path as activated but deactivate the uplink of the direct path according to at least one of the examples described below.
  • the base station can provide a conditional reset to the remote terminal and/or the relay terminal before the uplink deactivation of the direct path. Accordingly, when the uplink of the direct path is deactivated, the remote terminal can consider that the condition of the conditional reset is satisfied and apply the conditional reset to the direct path and the indirect path. When the uplink of the direct path is deactivated or information is received from the remote terminal, the relay terminal can also consider that the condition of the conditional reset is satisfied and apply the conditional reset to the indirect path.
  • the remote terminal when the uplink of the direct path is disabled, the remote terminal can change the default path of all split SRBs from the direct path to only the indirect path of the uplink. If the default path of the split DRB is set to the direct path, the default path of the DRB can also be changed to only the indirect path of the uplink.
  • the remote terminal when the uplink of the direct path is disabled, can change from a direct SRB to an indirect SRB only for the uplink according to a conditional reset.
  • the direct DRB when a direct path DRB is set, the direct DRB can also be changed to an indirect DRB or released only for the uplink according to a conditional reset.
  • the remote terminal may perform one, some, or all of the following actions:
  • the remote terminal may activate the uplink of the direct path and report the indirect path failure or the direct path failure to the base station. If the remote terminal fails to activate the uplink of the direct path or fails to report the path failure to the base station, the remote terminal may initiate an RRC connection re-establishment procedure.
  • the remote terminal may initiate an RRC connection re-establishment procedure without activating the uplink of the direct path.
  • the remote terminal can disable or release at least one of the SPS setting, the CG setting, the SRS setting, the active BWP of the direct path, the PUCCH setting, or/and the supplemental UL carrier.
  • the remote terminal may stop or suspend all timers associated with the direct path.
  • the remote terminal when the indirect path is disabled by autonomous activation/deactivation or reception of control information from the base station, the remote terminal can disable the indirect path and perform at least one of the examples described below.
  • the base station before disabling an indirect path, can provide a conditional reset to the remote terminal and/or the relay terminal for the disabling. Accordingly, when disabling the indirect path, the remote terminal can consider that the condition of the conditional reset is satisfied and apply the conditional reset to the direct path and the indirect path. When disabling the indirect path or receiving information from the remote terminal, the relay terminal can also consider that the condition of the conditional reset is satisfied and deactivate or release the indirect path according to the conditional reset.
  • the remote terminal when the PCell of the direct path is deactivated, can activate the direct path and the PCell of the direct path and trigger a random access procedure for the PCell when the indirect path is deactivated.
  • the remote terminal may activate the direct path (or the PCell of the direct path if disabled), perform cell selection or reselection, and trigger a random access procedure for the selected cell. If the random access procedure for the selected cell is successful, the remote terminal may consider the selected cell as the new PCell of the remote terminal and apply a conditional reset.
  • the remote terminal when the PCell of the remote terminal is in the indirect path, when the indirect path is deactivated, the remote terminal can perform cell selection or reselection and trigger a random access procedure for the selected cell. If the random access procedure for the selected cell is successful, the remote terminal can regard the selected cell as the PCell of the remote UE. That is, the PCell of the remote UE is changed to the selected cell, and a conditional reset can be applied to the direct path and/or the indirect path. The remote terminal can deactivate or release the indirect path according to the conditional reset for the indirect path.
  • the remote terminal when the uplink of the direct path is disabled, when the indirect path is disabled, the remote terminal can activate the uplink of the direct path and trigger a random access procedure for the PCell.
  • the default path of a split SRB or split DRB when an indirect path is disabled, if the default path of a split SRB or split DRB is set to a direct path, the default path of the SRB or DRB may also be changed to an indirect path.
  • a remote terminal when a direct path is disabled, can change from an indirect SRB to a direct SRB based on a conditional reconfiguration.
  • the indirect DRB can also be changed to a direct DRB or released based on a conditional reconfiguration.
  • the remote terminal may not perform one, some, or all of the following actions:
  • the remote terminal may activate the indirect path and report the direct path failure to the base station. If the remote terminal fails to activate the indirect path or fails to report the direct path failure to the base station, the remote terminal may initiate an RRC connection re-establishment procedure.
  • the remote terminal may initiate an RRC connection re-establishment procedure without activating the indirect path.
  • the remote terminal may deactivate or release the SL CG setting and/or the activated SL BWP on the indirect path.
  • the remote terminal may stop or suspend all timers associated with the indirect path (e.g., all timers associated with SL transmission and reception of the indirect path).
  • a terminal for which a direct path and/or an indirect path is established may measure at least one of its altitude, speed, Uu cell quality of the direct path or SL quality of the indirect path, and perform at least one of the operations described below according to the measurement result.
  • the terminal may deactivate the direct route.
  • the terminal may report information related to the deactivation of the direct route (e.g., information related to the event that deactivated the direct route, information about the deactivated route, etc.) to the base station.
  • the terminal may activate a direct route.
  • the terminal may report information related to the activation of the direct route (e.g., information related to the event that activated the direct route, information about the activated route, etc.) to the base station.
  • the terminal may activate the indirect path.
  • the terminal may report information related to the activation of the indirect path (e.g., information related to the event that activated the indirect path, information about the activated path, etc.) to the base station.
  • the terminal may deactivate the indirect path.
  • the terminal may report information related to the deactivation of the indirect path (e.g., information related to the event that deactivated the indirect path, information about the activated path, etc.) to the base station.
  • the terminal may deactivate the direct path.
  • the terminal may report information related to the deactivation of the direct path (e.g., information related to the event that deactivated the direct path, information about the deactivated path, etc.) to the base station.
  • the terminal may activate a direct path.
  • the terminal may report information related to the activation of the direct path (e.g., information related to the event that activated the direct path, information about the activated path, etc.) to the base station.
  • the terminal may activate an indirect path. Then, the terminal may report information related to the activation of the indirect path (e.g., information related to the event that activated the indirect path, information about the activated path, etc.) to the base station.
  • information related to the activation of the indirect path e.g., information related to the event that activated the indirect path, information about the activated path, etc.
  • the terminal may deactivate the indirect path.
  • the terminal may report information related to the deactivation of the indirect path (e.g., information related to the event that deactivated the indirect path, information about the activated path, etc.) to the base station.
  • the terminal may deactivate the direct path.
  • the terminal may report information related to the deactivation of the direct path (e.g., information related to the event that deactivated the direct path, information about the activated path, etc.) to the base station.
  • the terminal may activate a direct path.
  • the terminal may report information related to the activation of the direct path (e.g., information related to the event that activated the direct path, information about the activated path, etc.) to the base station.
  • the terminal may activate the direct path.
  • the terminal may report information related to the activation of the indirect path (e.g., information related to the event that activated the indirect path, information about the activated path, etc.) to the base station.
  • the terminal may deactivate the indirect path.
  • the terminal may report information related to the deactivation of the indirect path (e.g., information related to the event that deactivated the indirect path, information about the activated path, etc.) to the base station.
  • Example 3 relates to a set of at least two indirect paths through different relay terminals without (or with) a direct link to a remote terminal.
  • One or more indirect paths may be established for the remote terminal through the same or different relay terminals. Additionally, one or more direct paths may be established for the remote terminal, or no direct path may be established. Different indirect paths may be established on different sidelink carriers between the remote terminal and the same relay terminal. Alternatively, different indirect paths may be established using different relay terminals on the same or different sidelink carriers between the remote terminal and different relay terminals.
  • a remote terminal can be configured as multiple candidate U2N relay terminals. Only one configured relay terminal can be activated for a remote terminal, or more than one configured relay terminal can be activated for a remote terminal by RRC message, MAC CE or DCI.
  • a remote terminal may be configured with one or more sidelink carriers having identical or multiple configured U2N relay terminals. Only one sidelink carrier may be activated for each relay terminal or remote terminal, or more than one configured relay terminal may be activated for each relay terminal or remote terminal by RRC message or MAC CE or DCI.
  • the base station can transmit the path activation/deactivation MAC CE to the remote terminal via the direct path and/or the indirect path.
  • the relay terminal can receive the MAC CE from the base station (i.e., the DL MAC CE in the indirect path from the base station to the relay terminal), and then relay the MAC CE to the remote terminal.
  • the relay terminal can generate the relayed MAC CE (i.e., the DL MAC CE in the direct path from the base station to the remote terminal or the SL MAC CE in the indirect path from the relay terminal to the remote terminal) to be transmitted to the remote terminal based on Case 1.
  • the relay terminal can relay the MAC CE received from the base station to the remote terminal without changing the MAC CE, as in Case 2.
  • FIG. 13 illustrates a path activation/deactivation MAC CE.
  • a MAC CE according to Case 1 may correspond to a MAC CE of a direct path from a base station to a remote terminal, or may correspond to a MAC CE of an indirect path from a relay terminal to a remote terminal.
  • a MAC CE according to Case 2 (e.g., a MAC CE of FIG. 13 (b)) may correspond to a MAC CE of an indirect path from a base station to a relay terminal.
  • the D i field of the MAC CE may indicate whether the corresponding path with index i is activated or deactivated for the remote terminal.
  • a specific index i may be set to a specific direct path or a specific indirect path by an RRC message from the base station to the terminal. If the index is not set, the corresponding D i field is invalid and thus the terminal may ignore the field. If the index 0 is not set, the corresponding D 0 field may indicate activation or deactivation of the direct path in the PCell.
  • the D i field of the MAC CE set to a value of '0' indicates deactivation of the corresponding path with index i
  • the D i field of the MAC CE set to a value of '1' indicates activation of the corresponding path with index i, and vice versa.
  • the UE ID field of the MAC CE according to Case 2 may indicate the UE ID of the remote terminal.
  • the relay terminal may transmit the MAC CE according to Case 1 or Case 2 to the remote terminal corresponding to the UE ID included in the MAC CE received from the base station.
  • the MAC CE according to Case 2 transmitted to the remote terminal the MAC CE according to Case 2 received from the base station may be copied to the MAC CE according to Case 2 generated by the relay terminal.
  • the first octet of the MAC CE according to Case 2 received from the base station may be copied to the MAC CE according to Case 1 generated by the relay terminal.
  • the UE ID field may be N bits in size of one or more octets depending on which UE ID is used in the MAC CE.
  • the base station can determine/set the type of MAC CE used for each of the remote terminal and the relay terminal. That is, the base station can set which case/MAC CE among the MAC CE of (a) of Fig. 13 (e.g., the MAC CE according to Case 1) or the MAC CE of (b) (e.g., the MAC CE according to Case 2) is used for the remote terminal and the relay terminal. Additionally or alternatively, the relay terminal or the remote terminal can set which case/MAC CE among the MAC CEs illustrated in Fig. 13 is used for the MAC CE from the relay terminal to the remote terminal.
  • the relay terminal (or the remote terminal) can indicate the case of the set format to the remote terminal (or the relay terminal).
  • the base station can transmit MAC CE to the remote terminal/relay terminal via direct path or indirect path depending on one or more of the following options.
  • the base station can transmit MAC CE-based enable/disable status either directly (i.e., if enabled) or indirectly (i.e., if direct path is not enabled/established).
  • the base station can transmit MAC CE based on the measured results.
  • the base station may transmit MAC CE on the direct path.
  • the base station may transmit MAC CE on the indirect path.
  • the quality measured on the direct path may be Uu RSRP, Uu RSRQ or Uu RSSI
  • the quality measured on the indirect path may be SL-RSRP, SL-RSRQ, SL-RSSI or CBR (channel utilization).
  • the base station can transmit MAC CE based on the primary path. For example, if the direct path corresponds to the primary path, the base station can transmit MAC CE based on the direct path. If the indirect path corresponds to the primary path, the base station can transmit MAC CE based on the indirect path.
  • the relay terminal can activate or deactivate a specific path belonging only to the relay terminal according to the MAC CE.
  • the configuration can be provided on a path-by-path basis, on a remote-by-terminal basis or on a relay-by-terminal basis for activation-only or deactivation-only or both. If not configured by the base station, the relay terminal may not deactivate a specific activated path belonging to the relay terminal according to the MAC CE even if the remote terminal deactivates the corresponding path. If not configured by the base station, the relay terminal may not activate a specific disabled path belonging to the relay terminal according to the MAC CE even if the remote terminal activates the corresponding path.
  • the relay terminal may transmit a SL MAC CE or SCI indicating activation or deactivation of a specific path depending on the MAC CE received from the base station.
  • an SCI specifying an address of a remote terminal may be transmitted to the remote terminal over a unicast sidelink.
  • the SCI may include a bitmap where each bit indicates activation or deactivation of the corresponding path with index i. If the SCI indicates SL HARQ-ACK, the remote terminal may transmit ACK or NACK to the relay terminal upon receiving the SCI.
  • the SL slot used for SL HARQ-ACK transmission may be determined based on the application time upon SCI reception or the SCI indicating an explicit slot. In the case of the SCI indicating an explicit slot, the relay terminal may set an explicit slot based on the DL MAC CE transmission time or the RRC configuration by the base station.
  • SL MAC CE based on Case 1 can be transmitted to the remote UE over unicast sidelink.
  • the remote UE can transmit ACK or NACK to the relay UE as soon as it receives the SL MAC CE.
  • the SL slot used for SL HARQ-ACK transmission can be determined based on the application time according to SCI/SL MAC CE reception or the SCI indicating an explicit slot.
  • the relay UE can set an explicit slot based on the DL/SL MAC CE transmission time or the RRC configuration by gNB.
  • a remote terminal that has received a DL MAC CE or SL MAC CE or SCI indicating UE activation or deactivation may activate or deactivate a specific path according to the DL MAC CE or SL MAC CE or SCI indicating UE activation or deactivation after the application time.
  • the remote terminal may perform one or more of the following options for the indirect path from the start of the first step of the disabled state of the indirect path:
  • the remote terminal may not monitor SCI on the sidelink of the indirect path.
  • the remote terminal can activate the indirect path and start monitoring SCI on the sidelink of the indirect path.
  • the relay terminal of the indirect path may not monitor the SCI of the remote terminal. At this time, when the relay terminal receives a Uu RRC message indicating activation of the indirect path, a path activation/deactivation MAC CE or DCI from the base station, the relay terminal may activate the indirect path and start monitoring SCI on the sidelink of the indirect path.
  • the relay terminal of the indirect path can monitor the SCI of the remote terminal.
  • the relay terminal can activate the indirect path and start monitoring SCI on the sidelink of the indirect path.
  • Option 2 Short SL DRX cycle or no SL DRX cycle can be changed to long SL DRX cycle according to the periodic generation/transmission time of Keep-Alive message when SCI monitoring is performed.
  • Keep-alive message can be PC5-S signal for PC5 unicast link maintenance.
  • SCI e.g., SCI scheduling keep-alive message
  • keep-alive message of one UE can indicate activation of indirect path or maintenance of indirect path in disabled state to another UE.
  • the relay terminal may transmit an SCI or a connection keep-alive message indicating activation of the indirect path to the remote terminal.
  • the relay terminal may send an SCI or keep-alive message indicating deactivation of the indirect path to the remote terminal.
  • the remote terminal may transmit an SCI or connection keep-alive message indicating activation of the indirect path to the relay terminal.
  • the remote terminal may transmit an SCI or a keep-alive message indicating deactivation of the indirect path to the relay UE.
  • the remote terminal can activate the indirect path if it is inactive.
  • the remote terminal may deactivate the indirect path if it is activated.
  • the relay terminal can activate the indirect path if it is disabled.
  • the relay terminal may deactivate the indirect path if it is activated.
  • Option 3 Short SL DRX cycle or no SL DRX cycle can be changed to long SL DRX cycle when SCI monitoring situation matches periodic or aperiodic SL-CSI reporting trigger.
  • aperiodic or periodic reports can be triggered and/or transmitted on the sidelink.
  • the remote terminal can activate (or deactivate) the indirect path if it is deactivated (or activated).
  • a remote terminal that receives an SL-SCI report from a relay terminal and an SCI that triggers indirect path activation (or deactivation) can activate (or deactivate) the indirect path if the indirect path is deactivated (or activated).
  • the relay terminal can activate (or deactivate) the indirect path if it is deactivated (or activated).
  • a relay terminal that receives an SCI triggering SL-SCI reporting and activation (or deactivation) of an indirect path from a remote terminal can activate (or deactivate) the indirect path if it is deactivated (or activated).
  • the remote terminal can start PC5-RSRP measurement on the relay terminal. Or, in the deactivated state, the remote terminal can measure PC5-RSRP on the relay terminal.
  • the discovery message from another terminal can activate the indirect path if it is disabled, and deactivate the indirect path if it is enabled.
  • the remote terminal does not perform SL RLM and does not maintain the PC5 unicast link so that the SL RLF of the indirect path is not declared in the disabled state of the indirect path, but the remote terminal can continue to monitor the discovery message from the relay UE.
  • the relay terminal when the indirect path is disabled, the relay terminal does not maintain the PC5 unicast link and does not perform SL RLM, so the SL RLF of the indirect path is not declared in the indirect path disabled state, but the remote terminal can continue to monitor the discovery message of the relay terminal.
  • the relay terminal of the indirect path may not monitor the SCI of the remote terminal.
  • the relay terminal may transmit a discovery message notifying indirect path activation to the remote terminal if the indirect path is deactivated.
  • the relay terminal may transmit a discovery message notifying the deactivation of the indirect path to the remote terminal if the indirect path is activated.
  • the remote terminal may transmit a discovery message notifying indirect path activation to the relay terminal if the indirect path is deactivated.
  • the remote terminal may transmit a discovery message notifying indirect path deactivation to the relay terminal if the indirect path is activated.
  • the remote terminal may activate the indirect path if it is disabled.
  • the remote terminal may deactivate the indirect path if it is activated.
  • the relay terminal may activate the indirect path if it is disabled.
  • the relay terminal of the indirect path can monitor the SCI of the remote UE.
  • the relay terminal may activate the indirect path and start monitoring SCI on the sidelink of the indirect path.
  • DL MAC CE or DCI of the direct path or SL MAC CE or SCI of the first indirect path can indicate activation or deactivation of the second indirect path.
  • the terminal can receive SCI or SL MAC CE in the first indirect path, and the first indirect path can be the same as or different from the second indirect path.
  • DL MAC CE and SL MAC CE can be configured as shown in FIG. 13.
  • the first indirect path can be any activated indirect path.
  • the first indirect path can be a primary indirect path established by a base station or a remote terminal or a relay terminal.
  • the primary indirect path can be activated or deactivated (semi-statically or dynamically) by the base station or the relay terminal or the remote terminal.
  • the primary indirect path can be always activated.
  • the relay terminal may transmit an SCI or SL MAC CE indicating activation of the indirect path to the remote terminal.
  • the remote terminal may transmit an SCI or SL MAC CE indicating activation of the indirect path to the relay terminal.
  • the remote terminal may transmit an SCI or SL MAC CE indicating activation of the indirect path to the relay terminal.
  • the remote terminal Upon receiving an SCI or SL MAC CE indicating indirect path activation from a relay terminal, the remote terminal can activate the indirect path if it is disabled.
  • the remote terminal may deactivate the indirect path if it is enabled.
  • the relay terminal Upon receiving an SCI or SL MAC CE indicating indirect path activation from a remote terminal, the relay terminal can activate the indirect path if it is disabled.
  • the relay terminal may deactivate the indirect path if it is enabled.
  • Option 5B The DL MAC CE or DCI of the direct path or the SL MAC CE or SCI of the indirect path can indicate activation or deactivation of the direct path.
  • DL MAC CE and SL MAC CE can be configured as shown in FIG. 13.
  • the relay terminal may transmit an SCI or SL MAC CE indicating activation of the direct path to the remote terminal.
  • the relay terminal may transmit an SCI or SL MAC CE indicating deactivation of the direct path to the remote terminal.
  • the remote terminal Upon receiving an RRC message, DL MAC CE or DCI indicating activation of a direct path from a base station, the remote terminal can activate the direct path if it is disabled.
  • the remote terminal may deactivate the direct path if it is disabled.
  • the remote terminal Upon receiving an SCI or SL MAC CE indicating direct path activation from a relay terminal, the remote terminal can activate the direct path if it is disabled.
  • the remote terminal may deactivate the direct path if it is enabled.
  • the remote terminal may disable only uplink transmission, or disable both uplink transmission and downlink reception for the disabled direct path, as follows:
  • the remote terminal may perform one or more of the following options for the direct path in the disabled state:
  • Option 1 One or more or all of PUCCH, SRS, and PUSCH may not be transmitted on the direct path.
  • the terminal may not perform PDCCH monitoring on the direct path.
  • the terminal can perform PDCCH monitoring on the direct path.
  • PDCCH can activate RACH, PUCCH or SRS.
  • PDCCH can activate direct path.
  • the UE may stop the ongoing RACH procedure on the direct path. Alternatively, the UE may continue performing the ongoing RACH procedure on the direct path but may not trigger a new RACH on the direct path.
  • the primary path can be set as an indirect path per remote terminal, per DRB, per SRB, per cell, per radio bearer, per logical channel, per priority, or per QoS indicator. Or, only PUSCH may not be transmitted on the direct path.
  • PUSCH transmissions can be configured to be disallowed on a per remote terminal, per cell, per radio bearer, per logical channel, per priority, or per QoS indicator basis.
  • Option 3 HARQ-ACK/CSI reports are transmitted, but PUSCH and SRS may not be transmitted on the direct path.
  • Option 4 HARQ-ACK and aperiodic CSI reporting are transmitted, but PUSCH, SRS and periodic CSI reporting may not be transmitted on the direct path.
  • Option 5 HARQ-ACK is transmitted, but PUSCH, SRS and all CSI reports may not be transmitted on the direct path.
  • HARQ-ACK enable/disable can be indicated by DCI, but for a direct path in the enabled state, HARQ-ACK enable/disable cannot be indicated by DCI.
  • the terminal may consider HARQ-ACK as disabled for the direct path in the inactive state, but may consider HARQ-ACK as enabled for the direct path in the active state, or the enabling/disabling of HARQ-ACK for the direct path in the active state may be indicated by DCI.
  • the remote terminal and the base station may disable the direct UL (i.e., UL of the direct path) but enable the direct DL (i.e., DL of the direct path).
  • the direct UL i.e., UL of the direct path
  • the direct DL i.e., DL of the direct path
  • the remote terminal may stop direct UL for uplink data of the remote terminal and activate the indirect path, or may still monitor PDCCH and receive PDSCH on the direct path.
  • the remote terminal and the base station can optionally also disable indirect DL (i.e., downlink of the relay UE and/or SL transmission from the relay UE) for SL TX/RX power saving.
  • indirect DL i.e., downlink of the relay UE and/or SL transmission from the relay UE
  • the base station can activate or deactivate UL/DL of direct path by DCI or MAC CE, RRC.
  • the DCI can be DCI scheduling DL PDSCH, UL PUSCH or SL PSSCH.
  • the remote terminal can transmit HARQ-ACK, CSI reporting and/or SR through the indirect path as follows.
  • the remote terminal may indicate the following information to the relay terminal via SCI or SL MAC CE, if configured:
  • aperiodic/periodic CSI reporting and/or SR (Scheduling Request) triggered by remote terminals may initiate sidelink transmissions to the relay UE.
  • the remote terminal may allocate SL resources and transmit aperiodic/periodic CSI reporting and/or scheduling requests to the relay terminal via SCI and/or SL MAC CE and/or PC5-RRC messages.
  • the relay terminal Upon receiving the SCI and/or SL MAC CE and/or PC5-RRC message, the relay terminal can transmit the HARQ-ACK, CSI report and/or SR of the remote UE to the base station through the Uplink Control Information of PUCCH or PUSCH, UL MAC CE or UL RRC message.
  • the relay terminal can receive PUCCH settings for the remote terminal from the base station for the above purpose.
  • a remote terminal may trigger a RACH for direct UL, resume direct UL, and suspend indirect UL.
  • a base station can dynamically activate direct UL (and optionally direct DL PDCCH monitoring) (optionally deactivate indirect UL) in good coverage by DCI or MAC CE or RRC.
  • the network can establish direct paths and indirect paths for multi-path operation.
  • the terminal can support U2N relay function via SL, one of the paths according to the present disclosure can be dynamically activated or deactivated.
  • FIG. 14 illustrates a block diagram of a wireless communication device according to one embodiment of the present disclosure.
  • the first device (100) and the second device (200) can transmit and receive wireless signals through various wireless access technologies (e.g., LTE, NR).
  • various wireless access technologies e.g., LTE, NR.
  • a first device (100) includes one or more processors (102) and one or more memories (104), and may additionally include one or more transceivers (106) and/or one or more antennas (108).
  • the processor (102) controls the memories (104) and/or the transceivers (106), and may be configured to implement the descriptions, functions, procedures, suggestions, methods, and/or operational flowcharts disclosed in this disclosure.
  • the processor (102) may process information in the memory (104) to generate first information/signal, and then transmit a wireless signal including the first information/signal through the transceiver (106).
  • the processor (102) may receive a wireless signal including second information/signal through the transceiver (106), and then store information obtained from signal processing of the second information/signal in the memory (104).
  • the memory (104) may be connected to the processor (102) and may store various information related to the operation of the processor (102). For example, the memory (104) may perform some or all of the processes controlled by the processor (102), or may store software codes including commands for performing the descriptions, functions, procedures, proposals, methods, and/or operational flowcharts disclosed in the present disclosure.
  • the processor (102) and the memory (104) may be part of a communication modem/circuit/chip designed to implement a wireless communication technology (e.g., LTE, NR).
  • the transceiver (106) may be connected to the processor (102) and may transmit and/or receive wireless signals via one or more antennas (108).
  • the transceiver (106) may include a transmitter and/or a receiver.
  • the transceiver (106) may be used interchangeably with an RF (Radio Frequency) unit.
  • a device may also mean a communication modem/circuit/chip.
  • the second device (200) includes one or more processors (202), one or more memories (204), and may additionally include one or more transceivers (206) and/or one or more antennas (208).
  • the processor (202) may control the memories (204) and/or the transceivers (206), and may be configured to implement the descriptions, functions, procedures, suggestions, methods, and/or operational flowcharts disclosed in this disclosure.
  • the processor (202) may process information in the memory (204) to generate third information/signal, and then transmit a wireless signal including the third information/signal via the transceiver (206).
  • the processor (202) may receive a wireless signal including fourth information/signal via the transceiver (206), and then store information obtained from signal processing of the fourth information/signal in the memory (204).
  • the memory (204) may be connected to the processor (202) and may store various information related to the operation of the processor (202). For example, the memory (204) may perform some or all of the processes controlled by the processor (202), or may store software codes including commands for performing the descriptions, functions, procedures, proposals, methods, and/or operational flowcharts disclosed in the present disclosure.
  • the processor (202) and the memory (204) may be part of a communication modem/circuit/chip designed to implement wireless communication technology (e.g., LTE, NR).
  • the transceiver (206) may be connected to the processor (202) and may transmit and/or receive wireless signals via one or more antennas (208).
  • the transceiver (206) may include a transmitter and/or a receiver.
  • the transceiver (206) may be used interchangeably with an RF unit.
  • a device may also mean a communication modem/circuit/chip.
  • the LTE-M technology may be implemented by at least one of various standards such as 1) LTE CAT 0, 2) LTE Cat M1, 3) LTE Cat M2, 4) LTE non-BL (non-Bandwidth Limited), 5) LTE-MTC, 6) LTE Machine Type Communication, and/or 7) LTE M, and is not limited to the above-described names.
  • the wireless communication technology implemented in the device (100, 200) of the present disclosure may include at least one of ZigBee, Bluetooth, and Low Power Wide Area Network (LPWAN) considering low-power communication, and is not limited to the above-described names.
  • the ZigBee technology can create PAN (personal area networks) related to small/low-power digital communication based on various standards such as IEEE 802.15.4, and may be called by various names.
  • the method proposed in this disclosure has been described with a focus on examples applied to 3GPP LTE/LTE-A and 5G systems, but it can be applied to various wireless communication systems in addition to 3GPP LTE/LTE-A and 5G systems.

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  • Mobile Radio Communication Systems (AREA)

Abstract

Sont divulgués un procédé et un dispositif d'établissement de communication dans un système de communication sans fil. Selon un mode de réalisation de la présente divulgation, le procédé mis en œuvre par un premier terminal comprend les étapes consistant à : recevoir, d'une station de base, des premières informations de configuration relatives à un trajet direct et au moins un trajet indirect ; et activer ou désactiver le trajet direct ou le(s) trajet(s) indirect(s) sur la base du fait qu'au moins une valeur de mesure acquise au moyen du premier terminal satisfait au moins une condition, les premières informations de configuration pouvant comprendre des premières informations relatives au fait que l'activation ou la désactivation du trajet direct ou du ou des trajets indirects est autorisée d'après la ou les valeurs de mesure.
PCT/KR2024/013179 2023-09-01 2024-09-02 Procédé et appareil d'établissement de communication basée sur des trajets multiples dans un système de communication sans fil Pending WO2025048585A1 (fr)

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KR10-2023-0116449 2023-09-01
KR20230116449 2023-09-01

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020218801A1 (fr) * 2019-04-22 2020-10-29 엘지전자 주식회사 Procédé et dispositif de rétroaction concernant la réception de dci associées à une liaison latérale dans un système nr v2x
WO2022033549A1 (fr) * 2020-08-13 2022-02-17 维沃移动通信有限公司 Procédé et appareil d'établissement de connexion de commande de ressources radioélectriques, terminal et dispositif du côté réseau
US20230047705A1 (en) * 2021-08-11 2023-02-16 Sony Group Corporation Restricted target wake time service period termination
US20230104446A1 (en) * 2021-09-22 2023-04-06 Qualcomm Incorporated Low latency schemes for peer-to-peer (p2p) communications
KR20230113492A (ko) * 2022-01-21 2023-07-31 삼성전자주식회사 통신 시스템에서 통신 노드에 의해 수행되는 방법 및 통신 노드

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020218801A1 (fr) * 2019-04-22 2020-10-29 엘지전자 주식회사 Procédé et dispositif de rétroaction concernant la réception de dci associées à une liaison latérale dans un système nr v2x
WO2022033549A1 (fr) * 2020-08-13 2022-02-17 维沃移动通信有限公司 Procédé et appareil d'établissement de connexion de commande de ressources radioélectriques, terminal et dispositif du côté réseau
US20230047705A1 (en) * 2021-08-11 2023-02-16 Sony Group Corporation Restricted target wake time service period termination
US20230104446A1 (en) * 2021-09-22 2023-04-06 Qualcomm Incorporated Low latency schemes for peer-to-peer (p2p) communications
KR20230113492A (ko) * 2022-01-21 2023-07-31 삼성전자주식회사 통신 시스템에서 통신 노드에 의해 수행되는 방법 및 통신 노드

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