Terminal, base station, wireless communication system, and wireless communication method

Abstract

A terminal according to the present invention comprises: a reception unit that receives information which indicates a resource of sidelink communication in a specific cell belonging to a non-terrestrial network; and a control unit that performs specific control pertaining to the sidelink communication when the resource of the sidelink communication is allocated by the specific cell.

Description

Terminal, base station, wireless communication system, and wireless communication method

[0001] The present disclosure relates to a terminal, a base station, a wireless communication system, and a wireless communication method that support sidelink communication assuming NTN.

[0002] The 3rd Generation Partnership Project (3GPP) has developed specifications for the 5th generation mobile communication system (5G, also known as New Radio (NR) or Next Generation (NG)), and is also developing specifications for the next generation, known as Beyond 5G, 5G Evolution, or 6G.

[0003] First, in the standards up to 3GPP Release 18, D2D (Device to Device) technology has been considered, which allows terminals to communicate directly with each other without going through a base station. D2D reduces traffic between terminals and base stations and enables communication between terminals even when the base station becomes unavailable due to a disaster or other reason. D2D may also be referred to as sidelink or sidelink communication (e.g., Non-Patent Document 1).

[0004] Secondly, the Non-Terrestrial Network (NTN) is being considered in the standards up to 3GPP Release 18. NTN uses non-terrestrial networks such as satellites (hereafter referred to as satellites) to provide services to areas that cannot be covered by terrestrial networks (hereafter referred to as TN) due to cost and other reasons.

[0005] 3GPP TS 38.211 V17.3.0 (2022-09) “Enhanced support of reduced capability NR devices”, RP-223544, 3GPP TSG RAN Meeting #98-e, 3GPP, December 12-16, 2022

[0006] Against the background described above, the inventors, after careful consideration, have noticed that sidelink communication is assumed to be performed in a TN, and have found the need to clarify a mechanism for appropriately executing sidelink communication assuming an NTN, for reasons such as the fact that a cell belonging to an NTN has a wider coverage area than a cell belonging to a TN.

[0007] Therefore, the present disclosure has been made to solve the above-mentioned problems, and aims to provide a terminal, a base station, a wireless communication system, and a wireless communication method that can appropriately perform sidelink communication assuming NTN.

[0008] The disclosed aspect is a terminal including: a receiving unit that receives information indicating resources for sidelink communication in a specific cell belonging to a non-terrestrial network; and a control unit that performs specific control regarding the sidelink communication when the resources for the sidelink communication are allocated by the specific cell.

[0009] The disclosed aspect is a base station comprising: a transmitter that transmits information indicating resources for sidelink communication in a specific cell belonging to a non-terrestrial network; and a controller that assumes that a terminal executes specific control regarding the sidelink communication when the resources for the sidelink communication are allocated by the specific cell.

[0010] An aspect of the disclosure is a wireless communication system comprising a terminal and a base station, wherein the terminal comprises: a receiving unit that receives information indicating resources for sidelink communication in a specific cell belonging to a non-terrestrial network; and a control unit that performs specific control regarding the sidelink communication when the resources for the sidelink communication are allocated by the specific cell.

[0011] The disclosed aspect is a wireless communication method comprising: a step A of receiving information indicating resources for sidelink communication in a specific cell belonging to a non-terrestrial network; and a step B of performing specific control regarding the sidelink communication when the resources for the sidelink communication are allocated by the specific cell.

[0012] FIG. 1 is a schematic diagram of the overall configuration of a wireless communication system 10. FIG. 2 is a diagram showing frequency ranges used in the wireless communication system 10. FIG. 3 is a diagram showing an example configuration of a wireless frame, subframe, and slot used in the wireless communication system 10. FIG. 4 is a functional block diagram of a UE 200. FIG. 5 is a functional block diagram of a gNB 100. FIG. 6 is a functional block diagram of an LMF 300. FIG. 7 is a diagram for explaining protocols in an NTN. FIG. 8 is a diagram for explaining TA in an NTN. FIG. 9 is a sequence diagram showing an example (1) of V2X operation. FIG. 10 is a sequence diagram showing an example (2) of V2X operation. FIG. 11 is a sequence diagram showing an example (3) of V2X operation. FIG. 12 is a sequence diagram showing an example (4) of V2X operation. FIG. 13 is a diagram showing an example of sensing operation. FIG. 14 is a flowchart for explaining an example of preemption operation. FIG. 15 is a diagram for explaining an example of preemption operation. FIG. 16 is a diagram for explaining an example of periodic partial sensing. Fig. 17 is a diagram for explaining an example of continuous partial sensing. Fig. 18 is a diagram for explaining operation example 2. Fig. 19 is a diagram for explaining operation example 2. Fig. 20 is a diagram for explaining operation example 2. Fig. 21 is a diagram for explaining operation example 2. Fig. 22 is a diagram for explaining operation example 2. Fig. 23 is a diagram showing an example of the hardware configuration of the gNB100 and the UE200. Fig. 24 is a diagram showing an example of the configuration of a vehicle 2001.

[0013] Hereinafter, embodiments will be described with reference to the drawings. Note that the same or similar reference numerals are used to designate the same functions or configurations, and descriptions thereof will be omitted as appropriate.

[0014] [Embodiment] (1) Overall Schematic Configuration of Wireless Communication System Fig. 1 is an overall schematic configuration diagram of a wireless communication system 10 according to an embodiment. The wireless communication system 10 is a wireless communication system conforming to 5G New Radio (NR) and includes a Next Generation-Radio Access Network 20 (hereinafter, NG-RAN 20) and a terminal 200 (hereinafter, UE (User Equipment) 200).

[0015] The wireless communication system 10 may be a wireless communication system conforming to a system called Beyond 5G, 5G Evolution, or 6G.

[0016] The NG-RAN 20 includes a base station 100 (hereinafter, gNB 100). Note that the specific configuration of the wireless communication system 10, including the number of gNBs 100 and UEs 200, is not limited to the example shown in FIG.

[0017] The NG-RAN 20 actually includes a plurality of NG-RAN nodes, specifically, gNBs (or ng-eNBs), and is connected to a core network 30 conforming to 5G (for example, 5GC). The NG-RAN 20 and the core network 30 may be simply referred to as a "network."

[0018] The gNB100 is a radio base station conforming to 5G, and performs 5G radio communication with the UE 200. The gNB100 and UE 200 are capable of supporting Massive MIMO (Multiple-Input Multiple-Output), which generates a more directional beam (BM) by controlling radio signals transmitted from multiple antenna elements, Carrier Aggregation (CA), which aggregates multiple component carriers (CCs), and Dual Connectivity (DC), which simultaneously communicates on two or more transport blocks between the UE and each of two NG-RAN nodes.

[0019] The core network 30 includes a network device 300. The network device 300 may include a Location Management Function (LMF). The network device 300 may include an Access and Mobility management Function (AMF). The network device 300 may be an Evolved Serving Mobile Location Centre (E-SMLC). In the following, the case where the network device 300 is the LMF 300 will be mainly described.

[0020] In an embodiment, a non-terrestrial network (hereinafter, NTN) may be assumed. In an NTN, a non-terrestrial network such as an artificial satellite 150 (hereinafter, satellite 150) is used to provide services to areas that cannot be covered by a terrestrial network (hereinafter, TN) due to cost or other reasons. The NTN can provide more reliable services. For example, the NTN is expected to be applied to IoT (Internet of Things), ships, buses, trains, and critical communications. The NTN also has scalability through efficient multicast or broadcast.

[0021] In addition, a network including a gNB 100 and a UE 200 without including a satellite 150 may be referred to as a terrestrial network (TN) in contrast to an NTN.

[0022] The gNB 100 has an NTN gateway 100X. The NTN gateway 100X transmits a downlink signal to a satellite 150. The NTN gateway 100X receives an uplink signal from the satellite 150. The gNB 100 has a cell C1 as its coverage area.

[0023] The satellite 150 relays downlink signals received from the NTN gateway 100X to the UE 200. The satellite 150 relays uplink signals received from the UE 200 to the NTN gateway 100X. The satellite 150 has a cell C2 as its coverage area. The satellite 150 may be considered a TRP (Transmission-Reception Point).

[0024] In the embodiment, D2D (Device to Device) may be assumed, in which UEs 200 (e.g., UE 200A and UE 200B) communicate directly with each other without going through the gNB 100. D2D may also be referred to as sidelink or sidelink communication. D2D may include V2X (Vehicle to Everything) or eV2X (enhanced V2X). V2X is a part of ITS (Intelligent Transport Systems) and may be a collective term for V2V (Vehicle to Vehicle) meaning a communication mode performed between vehicles, V2I (Vehicle to Infrastructure) meaning a communication mode performed between a vehicle and a roadside unit (RSU: Road-Side Unit) installed on the side of the road, V2N (Vehicle to Network) meaning a communication mode performed between a vehicle and an ITS server, and V2P (Vehicle to Pedestrian) meaning a communication mode performed between a vehicle and a mobile terminal carried by a pedestrian.

[0025] Note that SL (Sidelink) may be distinguished based on either UL (Uplink) or DL ​​(Downlink) based on any one or a combination of 1) to 4) below. SL may also be called by other names.

[0026] 1) Resource allocation in the time domain; 2) Resource allocation in the frequency domain; 3) Synchronization signals to be referenced (including Sidelink Synchronization Signal (SLSS)); 4) Reference signals to be used in path loss measurement for transmission power control. Furthermore, with regard to SL or UL Orthogonal Frequency Division Multiplexing (OFDM), any of Cyclic-Prefix OFDM (CP-OFDM), Discrete Fourier Transform-Spread-OFDM (DFT-S-OFDM), OFDM without transform precoding, or OFDM with transform precoding may be applied.

[0027] The resource allocation method used in SL may include a first method in which resources are allocated by the gNB100 and a second method in which the UE200 autonomously selects resources. In the first method, resources for SL communication may be allocated by downlink control information (DCI) transmitted from the gNB100 to the UE200. The first method may be referred to as Mode 1 resource allocation, which may be referred to as Mode 3 in LTE. In the second method, the UE200 may select resources for SL communication from a resource pool (a pre-configured resource pool). The second method may be referred to as Mode 2 resource allocation, which may be referred to as Mode 4 in LTE.

[0028] The wireless communication system 10 also supports a plurality of frequency ranges (FR).

[0029] 2, the wireless communication system 10 supports FR1 and FR2. The frequency bands of each FR are as follows:

[0030] ・FR1: 410 MHz to 7.125 GHz ・FR2: 24.25 GHz to 52.6 GHz FR1 may use a Sub-Carrier Spacing (SCS) of 15, 30, or 60 kHz, and a bandwidth (BW) of 5 to 100 MHz. FR2 is a higher frequency than FR1, and may use an SCS of 60 or 120 kHz (including 240 kHz), and a bandwidth (BW) of 50 to 400 MHz.

[0031] Note that SCS may be interpreted as numerology, which is defined in 3GPP TS38.300 and corresponds to one subcarrier spacing in the frequency domain.

[0032] Furthermore, the wireless communication system 10 also supports frequency bands higher than the FR2 frequency band. Specifically, the wireless communication system 10 supports frequency bands above 52.6 GHz up to 71 GHz or 114.25 GHz. For convenience, such high frequency bands may be referred to as "FR2x."

[0033] To solve the problem of increased phase noise in high frequency bands, when using bands above 52.6 GHz, Cyclic Prefix-Orthogonal Frequency Division Multiplexing (CP-OFDM) / Discrete Fourier Transform - Spread (DFT-S-OFDM) with larger Sub-Carrier Spacing (SCS) may be applied.

[0034] FIG. 3 shows an example of the configuration of radio frames, subframes, and slots used in the radio communication system 10.

[0035] As shown in Figure 3, one slot consists of 14 symbols, and the larger (wider) the SCS, the shorter the symbol period (and slot period). The SCS is not limited to the interval (frequency) shown in Figure 3. For example, 480 kHz, 960 kHz, etc. may be used.

[0036] Furthermore, the number of symbols constituting one slot does not necessarily have to be 14 (for example, 28 symbols or 56 symbols). Furthermore, the number of slots per subframe may differ depending on the SCS.

[0037] The time direction (t) shown in Fig. 3 may be called a time domain, a symbol period, a symbol time, etc. The frequency direction may be called a frequency domain, a resource block, a subcarrier, a bandwidth part (BWP), etc.

[0038] DMRS is a type of reference signal and is prepared for various channels. Here, unless otherwise specified, it may refer to a downlink data channel, specifically, a DMRS for a PDSCH (Physical Downlink Shared Channel). However, a DMRS for an uplink data channel, specifically, a PUSCH (Physical Uplink Shared Channel), may be interpreted as being the same as a DMRS for a PDSCH. Alternatively, DMRS may refer to a DMRS for a sidelink data channel, specifically, a PSSCH (Physical Sidelink Shared Channel). Alternatively, it may refer to a DMRS for a control channel.

[0039] The DMRS may be used for channel estimation at the device, for example, as part of coherent demodulation at the UE 200. The DMRS may only be present in resource blocks (RBs) used for PDSCH transmission.

[0040] A DMRS may have multiple mapping types. Specifically, a DMRS has mapping type A and mapping type B. In mapping type A, the first DMRS is placed in the second or third symbol of a slot. In mapping type A, the DMRS may be mapped based on a slot boundary, regardless of where in the slot actual data transmission starts. The reason why the first DMRS is placed in the second or third symbol of a slot may be interpreted as being to place the first DMRS after a control resource set (CORESET).

[0041] In mapping type B, the first DMRS may be placed in the first symbol of the data allocation, i.e., the position of the DMRS may be given relative to where the data is placed, rather than relative to the slot boundary.

[0042] Furthermore, DMRS may have multiple types. Specifically, DMRS has Type 1 and Type 2. Type 1 and Type 2 differ in frequency domain mapping and the maximum number of orthogonal reference signals. Type 1 is a single-symbol DMRS that can output up to four orthogonal signals, while Type 2 is a double-symbol DMRS that can output up to eight orthogonal signals.

[0043] (2) Functional Block Configuration of Wireless Communication System Next, the functional block configuration of the wireless communication system 10 will be described.

[0044] First, the functional block configuration of the UE 200 will be described.

[0045] Fig. 4 is a functional block diagram of UE 200. As shown in Fig. 4, UE 200 includes radio signal transmitting / receiving unit 210, amplifier unit 220, modem unit 230, control signal / reference signal processing unit 240, encoding / decoding unit 250, data transmitting / receiving unit 260, and control unit 270.

[0046] The radio signal transmitting / receiving unit 210 transmits and receives radio signals conforming to NR. The radio signal transmitting / receiving unit 210 supports Massive MIMO, CA that uses a bundle of multiple CCs, and DC that simultaneously communicates between a UE and two NG-RAN nodes.

[0047] The amplifier unit 220 is configured by a PA (Power Amplifier) / LNA (Low Noise Amplifier), etc. The amplifier unit 220 amplifies the signal output from the modulation / demodulation unit 230 to a predetermined power level. The amplifier unit 220 also amplifies the RF signal output from the radio signal transmission / reception unit 210.

[0048] The modem unit 230 performs data modulation / demodulation, transmission power setting, resource block allocation, etc. for each predetermined communication destination (gNB 100, another gNB, or another UE 200). The modem unit 230 may apply Cyclic Prefix-Orthogonal Frequency Division Multiplexing (CP-OFDM) / Discrete Fourier Transform - Spread (DFT-S-OFDM). Furthermore, DFT-S-OFDM may be used not only for the uplink (UL) but also for the downlink (DL) or sidelink (SL).

[0049] The control signal and reference signal processor 240 executes processing related to various control signals transmitted and received by the UE 200 and processing related to various reference signals transmitted and received by the UE 200 .

[0050] Specifically, the control signal / reference signal processor 240 receives various control signals, for example, control signals of a radio resource control layer (RRC), transmitted via a predetermined control channel from the gNB 100 or another UE 200. In addition, the control signal / reference signal processor 240 transmits various control signals via a predetermined control channel to the gNB 100 or another UE 200.

[0051] The control signal / reference signal processor 240 performs processing using reference signals (RS) such as a Demodulation Reference Signal (DMRS) and a Phase Tracking Reference Signal (PTRS).

[0052] DMRS is a terminal-specific reference signal (pilot signal) known between the base station and the terminal to estimate the fading channel used for data demodulation, while PTRS is a terminal-specific reference signal intended to estimate phase noise, which is an issue in high frequency bands.

[0053] In addition to the DMRS and PTRS, the reference signals may also include a Channel State Information-Reference Signal (CSI-RS), a Sounding Reference Signal (SRS), and a Positioning Reference Signal (PRS) for position information.

[0054] The channels include control channels and data channels. The control channels include a Physical Downlink Control Channel (PDCCH), a Physical Uplink Control Channel (PUCCH), a Random Access Channel (RACH), Downlink Control Information (DCI) including a Random Access Radio Network Temporary Identifier (RA-RNTI), and a Physical Broadcast Channel (PBCH). The control channels in the sidelink include a Physical Sidelink Control Channel (PSCCH), a Physical Sidelink Discovery Channel (PSDCH), a Physical Sidelink Broadcast Channel (PSBCH), and a Physical Sidelink Feedback Channel (PSFCH).

[0055] Furthermore, the data channel includes a PDSCH (Physical Downlink Shared Channel) and a PUSCH (Physical Uplink Shared Channel). Data refers to data transmitted via a data channel. The data channel may be interpreted as a shared channel. Furthermore, the data channel in the sidelink includes a PSSCH (Physical Sidelink Shared Channel).

[0056] Here, the control signal / reference signal processor 240 may receive downlink control information (DCI). The DCI includes existing fields for storing DCI Formats, Carrier indicator (CI), BWP indicator, Frequency Domain Resource Assignment (FDRA), Time Domain Resource Assignment (TDRA), Modulation and Coding Scheme (MCS), HARQ Process Number (HPN), New Data Indicator (NDI), Redundancy Version (RV), etc. Note that sidelink control information (SCI) may be received in the sidelink, and the above-mentioned or later-described DCI may be replaced with SCI.

[0057] The value stored in the DCI Format field is an information element that specifies the format of the DCI. The value stored in the CI field is an information element that specifies the CC to which the DCI applies. The value stored in the BWP indicator field is an information element that specifies the BWP to which the DCI applies. The BWP that can be specified by the BWP indicator is set by an information element (BandwidthPart-Config) included in the RRC message. The value stored in the FDRA field is an information element that specifies the frequency domain resource to which the DCI applies. The frequency domain resource is identified by the value stored in the FDRA field and an information element (RA Type) included in the RRC message. The value stored in the TDRA field is an information element that specifies the time domain resource to which the DCI applies. The time domain resource is identified by the value stored in the TDRA field and information elements (pdsch-TimeDomainAllocationList, pusch-TimeDomainAllocationList) included in the RRC message. The time domain resource may be identified by the value stored in the TDRA field and a default table. The value stored in the MCS field is an information element that specifies the MCS to which the DCI applies. The MCS is identified by the value stored in the MCS and an MCS table. The MCS table may be specified by an RRC message or may be determined by RNTI scrambling. The value stored in the HPN field is an information element that specifies the HARQ process to which the DCI is applied. The value stored in the NDI field is an information element for specifying whether the data to which the DCI is applied is initial transmission data. The value stored in the RV field is an information element that specifies the redundancy of the data to which the DCI is applied.

[0058] The encoding / decoding unit 250 performs data segmentation / concatenation and channel coding / decoding for each predetermined communication destination (gNB100 or another gNB or another UE200).

[0059] Specifically, the encoding / decoding unit 250 divides the data output from the data transmitting / receiving unit 260 into pieces of a predetermined size, performs channel coding on the divided data, decodes the data output from the modem unit 230, and concatenates the decoded data.

[0060] The data transmitter / receiver 260 transmits and receives Protocol Data Units (PDUs) and Service Data Units (SDUs). Specifically, the data transmitter / receiver 260 assembles and disassembles PDUs / SDUs in multiple layers (such as a Medium Access Control layer (MAC), a Radio Link Control layer (RLC), and a Packet Data Convergence Protocol layer (PDCP)). The data transmitter / receiver 260 also performs data error correction and retransmission control based on Hybrid Automatic Repeat Request (HARQ).

[0061] The control unit 270 controls each functional block constituting the UE 200. In an embodiment, the control unit 270 may control UL communication or SL communication. The UL communication is an example of communication on an interface (Uu interface) between the gNB 100 and the UE 200. The SL communication is an example of communication on an interface (PC5 interface) between the UEs 200.

[0062] Secondly, we will explain the functional block configuration of gNB100.

[0063] Fig. 5 is a functional block diagram of the gNB 100. As shown in Fig. 5, the gNB 100 has a receiving unit 110, a transmitting unit 120, and a control unit 130.

[0064] The receiving unit 110 receives various signals from the UE 200. The receiving unit 110 may receive an UL signal via a PUCCH or a PUSCH.

[0065] The transmitter 120 transmits various signals to the UE 200. The transmitter 120 may transmit the DL signal via the PDCCH or the PDSCH.

[0066] The control unit 130 controls the gNB 100. In an embodiment, the control unit 130 may assume that the UE 200 performs the SL communication.

[0067] Thirdly, the functional block configuration of the LMF300 will be explained.

[0068] 6 is a functional block diagram of the LMF 300. As shown in FIG. 6, the LMF 300 includes a receiving unit 310, a transmitting unit 320, and a control unit 330.

[0069] The receiving unit 310 may receive various messages from the UE 200. The messages may be referred to as LPP Provide Location Information or as an NRPPa (NR Positioning Protocol A) message (Type: Measurement Report). The receiving unit 310 may receive various messages from the gNB 100. The messages may be referred to as an NRPPa message (Type: POSITIONING INFORMATION REQUEST).

[0070] The transmitting unit 320 may transmit various messages to the UE 200. The messages may be referred to as LPP Provide Assistance Data. The transmitting unit 320 may transmit various messages to the gNB 100. The messages may be referred to as NRPPa messages (Type: Measurement Request).

[0071] The control unit 330 controls the LMF 300. For example, the control unit 330 may execute specific control (Multi-RTT Positioning) to estimate location information of the UE 200 based on a UE Rx-Tx time difference. The control unit 330 may execute specific control (DL-TDOA Positioning) to estimate location information of the UE 200 based on a DL RSTD (Reference Signal Time Difference).

[0072] (3) Overview of NTN First, we will explain the protocols related to NTN.

[0073] 7, the gNB 100 has a protocol stack including PHY, MAC, RLC, PDCP, RRC / SDAP, etc. Similarly, the UE 200 has a protocol stack including PHY, MAC, RLC, PDCP, RRC / SDAP, etc. The satellite 150 relays communication between the gNB 100 and the UE 200.

[0074] Here, the link between the gNB 100 (NTN Gateway 100X) and the satellite 150 may be referred to as a Feeder link. The link between the satellite 150 and the UE 200 may be referred to as a Service link. The interface between the gNB 100 and the UE 200 may be referred to as an NR Uu.

[0075] NTN's network architecture may employ either FDD or TDD. Terrestrial cells may be fixed or mobile. UE 200 may be capable of supporting the Global Navigation Satellite System (GNSS). UE 200 may be a power class 3 handheld device in FR1, and may be a very small aperture terminal (VSAT) in at least FR2.

[0076] NTN's network architecture may assume regenerative payloads. For example, the gNB100 functionality may be mounted on a satellite or air vehicle. Alternatively, a gNB-DU (Distributed Unit) may be mounted on a satellite or air vehicle, and a gNB-CU (Central Unit) may be deployed as a ground station.

[0077] Secondly, we will explain TA (Timing Advance) at NTN.

[0078] As shown in FIG. 8, the full TA in the NTN can be expressed as "Full TA = Feeder link TA + Service link TA".

[0079] The TA of the feeder link corresponds to the round trip delay (RTT) of the feeder link, and is calculated as 2 × (User transparent + N TA,common ) User transparent is a value that is transparent to the UE 200 and is a value that is compensated by the network (gNB 100). To simplify the implementation of the gNB 100, the value of User transparent may be a constant. N TA,common is the TA common to the beam or cell of the satellite 150. TA,common is set based on the RP (Reference Point).

[0080] The TA of the service link corresponds to the round trip delay (RTT) of the service link, and is 2 × N TA,UE-specific It can be expressed as N TA,UE-specific is a value specific to the UE 200.

[0081] Here, TA may be expressed by the following formula:

[0082] T TA = (N TA +N TA,UE-specific +N TA,common +N TA,offset ) × Tc T TA :Timing advance between downlink and uplink N TA :Timing advance between downlink and uplink N TA,UE-specific :UE-derived timing correction N TA,common :Network-controlled timing correction N TA,offset :A fixed offset used to calculate the timing advance Tc:Basic time unit for NR N TA is the closed loop TA. N TAis defined as 0 for the Physical Random Access Channel (PRACH). TA is updated based on the TA Command field of msg2 / msgB and the TA command of the Medium Access Control Control Element (MAC CE) of the medium access control layer.

[0083] N TA,UE-specific is the open loop TA. N TA,UE-specific is a TA for compensating for delay in the service link, and is autonomously updated by the UE 200. TA,UE-specific is calculated based on the position information of the UE 200 and the orbit information of the satellite 150. For example, the position information of the UE 200 may be acquired based on a radio signal from a satellite positioning system (not shown).

[0084] N TA,common is the open loop TA. N TA,common is a common TA controlled by the network (gNB100). TA,common is autonomously updated by UE200 using parameters (parameters for determining common TA) notified by gNB100.

[0085] In addition, N TA,common The Reference Point (RP) that defines N may be set anywhere on the Feeder link. The RP may be set in the gNB 100, in the satellite 150, or between the gNB 100 and the satellite 150. When the RP is set in the gNB 100, there is an advantage that the burden on the gNB 100 is reduced. When the RP is set in the satellite 150, N TA,common This has the advantage of reducing the burden on UE200.

[0086] (4) Overview of SL The UE200 performing SL communication may be a vehicle, a terminal held by a person, a communication device mounted on a drone or an aircraft, a base station, an RSU, a relay station (relay node), a terminal with scheduling capability, or an IoT (Internet of Things) device such as a smart meter.

[0087] The term "configuring" radio parameters, etc. may mean that a predetermined value is pre-configured, or that radio parameters notified from gNB100 or UE200 are set.

[0088] In NR-SL, it is assumed that Hybrid Automatic Repeat Request (HARQ) is supported for unicast and groupcast sidelinks. Furthermore, in NR-V2X, Sidelink Feedback Control Information (SFCI) including HARQ responses is defined. Furthermore, SFCI is transmitted via the Physical Sidelink Feedback Channel (PSFCH).

[0089] In the following description, the PSFCH is used for transmitting and receiving the HARQ-ACK on the side link, but this is just an example. For example, the HARQ-ACK may be transmitted on the side link using the PSCCH, the HARQ-ACK may be transmitted on the side link using the PSSCH, or the HARQ-ACK may be transmitted on the side link using another channel.

[0090] Hereinafter, for convenience, information reported by UE 200 in HARQ will be generally referred to as HARQ-ACK. This HARQ-ACK may also be referred to as HARQ-ACK information. More specifically, a codebook applied to HARQ-ACK information reported from UE 200 to gNB 100 or the like will be referred to as HARQ-ACK codebook. The HARQ-ACK codebook defines a bit string for HARQ-ACK information. Note that NACK as well as ACK is transmitted using "HARQ-ACK".

[0091] Fig. 9 is a sequence diagram showing an operation example (1) of V2X. As shown in Fig. 9, the wireless communication system according to the embodiment of the present invention may include a UE 200A and a UE 200B. Note that, although a large number of user equipments actually exist, Fig. 9 shows the UE 200A and the UE 200B as an example.

[0092] Hereinafter, when there is no need to distinguish between UE200A, UE200B, etc., they will be simply referred to as "UE200" or "user equipment." While Fig. 9 shows an example in which UE200A and UE200B are both within the coverage of a cell, the operation in the embodiment of the present invention can also be applied to a case in which UE200B is out of coverage.

[0093] It should be noted that UE200 does not need to be a device in a single housing. For example, even if various sensors are arranged in a dispersed manner within a vehicle, UE200 may be a device including the various sensors.

[0094] The processing of sidelink transmission data by UE 200 is basically the same as that of UL transmission in LTE or NR. For example, UE 200 scrambles and modulates codewords of transmission data to generate complex-valued symbols, maps the complex-valued symbols (transmission signals) to one or two layers, and performs precoding. Then, it maps the precoded complex-valued symbols to resource elements to generate transmission signals (e.g., complex-valued time-domain SC-FDMA signals), which are then transmitted from each antenna port.

[0095] The gNB 100 has a cellular communication function as a base station in LTE or NR, and a function for enabling communication of the UE 200 in this embodiment (e.g., resource pool configuration, resource allocation, etc.). The gNB 100 may also be an RSU (gNB-type RSU).

[0096] Furthermore, in the wireless communication system according to the embodiment of the present invention, the signal waveform used by UE 200 for SL or UL may be OFDMA, SC-FDMA, or another signal waveform.

[0097] As a synchronization signal in the SL, the UE 200 transmits a Sidelink Synchronization Signal Block (S-SSB). The S-SSB may include a Sidelink Primary Synchronization Signal (S-PSS), a Sidelink Secondary Synchronization Signal (S-SSS), and a Physical Sidelink Broadcast Channel (PSBCH). Note that the names S-SSB, S-PSS, S-SSS, etc. are merely examples, and names other than S-SSB, S-PSS, S-SSS, etc. may also be used.

[0098] The UE 200 transmits an S-SSB to another UE 200 based on a signal received from the gNB 100, a Global Navigation Satellite System (GNSS) signal, or a signal received from another UE 200. Note that if the UE 200 cannot transmit an S-SSB based on any signal from the gNB 100, the GNSS, or another UE 200, the UE 200 may transmit an autonomously determined S-SSB to the other UE 200. The resources available for the S-SSB may be periodic slots and may be referred to as S-SSB opportunities.

[0099] In step S101, the UE 200A autonomously selects resources to be used for the PSCCH and the PSSCH from a resource selection window having a predetermined period. The resource selection window may be set to the UE 200 by the gNB 100. Here, the predetermined period of the resource selection window may be defined by implementation conditions of the terminal, such as processing time or maximum allowable packet delay time, or may be defined in advance by specifications, or the predetermined period may be referred to as an interval in the time domain.

[0100] In steps S102 and S103, the UE 200A transmits SCI (Sidelink Control Information) via the PSCCH and / or PSSCH using the resources autonomously selected in step S101, and transmits SL data via the PSSCH. For example, the UE 200A may transmit the PSCCH using a time resource that is the same as at least a part of the time resource of the PSSCH, and a frequency resource that may or may not be adjacent to the frequency resource of the PSSCH.

[0101] The UE 200B receives the SCI (PSCCH and / or PSSCH) and SL data (PSSCH) transmitted from the UE 200A. The received SCI may include information on PSFCH resources for the UE 200B to transmit a HARQ-ACK in response to the reception of the data. The UE 200A may transmit information on autonomously selected resources by including it in the SCI. Note that the resources available for the PSFCH may be periodic slots and the last symbols in the slots (excluding the final symbol), and may be referred to as PSFCH opportunities.

[0102] In step S104, the UE 200B transmits a HARQ-ACK for the received data to the UE 200A using the PSFCH resource determined from the received SCI.

[0103] In step S105, if the HARQ-ACK received in step S104 indicates a request for retransmission, i.e., if the HARQ-ACK is a NACK (negative acknowledgement), the UE 200A retransmits the PSCCH and PSSCH to the UE 200B. The UE 200A may retransmit the PSCCH and PSSCH using autonomously selected resources.

[0104] If HARQ control involving HARQ feedback is not performed, steps S104 and S105 may not be performed.

[0105] 10 is a sequence diagram showing an operation example (2) of V2X. Blind retransmission without HARQ control may be performed to improve the transmission success rate or reach.

[0106] In step S201, the UE 200A autonomously selects resources to be used for the PSCCH and the PSSCH from a resource selection window having a predetermined period. The resource selection window may be set to the UE 200 by the gNB 100.

[0107] In steps S202 and S203, the UE 200A transmits the SCI via the PSCCH and / or the PSSCH and transmits the SL data via the PSSCH using the resources autonomously selected in step S201. For example, the UE 200A may transmit the PSCCH using a time resource that is the same as at least a part of the time resource of the PSSCH and a frequency resource that is adjacent to the frequency resource of the PSSCH.

[0108] In step S204, the UE 200A retransmits the SCI via the PSCCH and / or the PSSCH and the SL data via the PSSCH to the UE 200B by using the resource autonomously selected in step S201. The retransmission in step S204 may be performed multiple times.

[0109] If blind retransmission is not performed, step S204 does not have to be performed.

[0110] 11 is a sequence diagram showing a V2X operation example (3). The gNB 100 may perform sidelink scheduling. That is, the gNB 100 may determine sidelink resources to be used by the UE 200 and transmit information indicating the resources to the UE 200. Furthermore, when HARQ control involving HARQ feedback is applied, the gNB 100 may transmit information indicating PSFCH resources to the UE 200.

[0111] In step S301, the gNB 100 performs SL scheduling by transmitting DCI (Downlink Control Information) to the UE 200A via the PDCCH. Hereinafter, for convenience, the DCI for SL scheduling will be referred to as SL scheduling DCI.

[0112] In step S301, it is also assumed that the gNB 100 transmits DCI for DL ​​scheduling (which may also be referred to as DL allocation) to the UE 200A via the PDCCH. Hereinafter, for convenience, the DCI for DL ​​scheduling is referred to as DL scheduling DCI. Having received the DL scheduling DCI, the UE 200A receives DL data via the PDSCH using resources specified in the DL scheduling DCI.

[0113] In steps S302 and S303, the UE 200A transmits SCI (Sidelink Control Information) via the PSCCH and / or PSSCH using resources specified in the SL scheduling DCI, and transmits SL data via the PSSCH. Note that the SL scheduling DCI may specify only the resources of the PSSCH. In this case, for example, the UE 200A may transmit the PSCCH using frequency resources adjacent to the frequency resources of the PSSCH, using the same time resources as at least a part of the time resources of the PSSCH.

[0114] The UE 200B receives the SCI (PSCCH and / or PSSCH) and the SL data (PSSCH) transmitted from the UE 200A. The SCI received by the PSCCH and / or PSSCH includes information about the PSFCH resource used by the UE 200B to transmit a HARQ-ACK in response to the reception of the data.

[0115] The information on the resource is included in the DL scheduling DCI or SL scheduling DCI transmitted from the gNB 100 in step S301, and the UE 200A acquires the information on the resource from the DL scheduling DCI or SL scheduling DCI and includes it in the SCI. Alternatively, the DCI transmitted from the gNB 100 may not include the information on the resource, and the UE 200A may autonomously include the information on the resource in the SCI and transmit it.

[0116] In step S304, the UE 200B transmits a HARQ-ACK for the received data to the UE 200A by using the PSFCH resource determined from the received SCI.

[0117] In step S305, the UE 200A transmits a HARQ-ACK using a PUCCH (Physical uplink control channel) resource specified by the DL scheduling DCI (or the SL scheduling DCI) at a timing (e.g., slot-by-slot timing) specified by the DL scheduling DCI, and the gNB 100 receives the HARQ-ACK. The codebook for the HARQ-ACK may include a HARQ-ACK generated based on the HARQ-ACK received from the UE 200B or a PSFCH that was not received, and a HARQ-ACK for DL ​​data. However, if no DL data is allocated, for example, a HARQ-ACK for DL ​​data is not included. In NR Rel. 16, the codebook for the HARQ-ACK does not include a HARQ-ACK for DL ​​data.

[0118] If HARQ control involving HARQ feedback is not performed, step S304 and / or step S305 may not be performed.

[0119] FIG. 12 is a sequence diagram showing a V2X operation example (4). As described above, in the NR sidelink, it is supported that HARQ responses are transmitted on the PSFCH. Note that the PSFCH format can be, for example, the same format as PUCCH (Physical Uplink Control Channel) format 0. That is, the PSFCH format may have a PRB (Physical Resource Block) size of 1, and may be a sequence-based format in which ACKs and NACKs are identified by differences in sequence and / or cyclic shifts. The PSFCH format is not limited to this. The PSFCH resource may be allocated to the last symbol or the last multiple symbols of a slot. Furthermore, a periodicity N may be set or predefined for the PSFCH resource. The periodicity N may be set or predefined on a slot-by-slot basis.

[0120] In FIG. 12 , the vertical axis corresponds to the frequency domain, and the horizontal axis corresponds to the time domain. The PSCCH may be placed in the first symbol of a slot, or in multiple symbols from the first, or in multiple symbols from symbols other than the first. The PSFCH may be placed in the last symbol of a slot, or in multiple symbols from the last. Note that the above-mentioned "first symbol of a slot" and "last symbol of a slot" may not take into account symbols for AGC (Automatic Gain Control) and symbols for transmission / reception switching. That is, for example, if one slot consists of 14 symbols, the "first symbol of a slot" and the "last symbol of a slot" may refer to the first and last symbols, respectively, of the 12 symbols excluding the first and last symbols. In the example shown in FIG. 12 , three subchannels are configured in the resource pool, and two PSFCHs are placed three slots after the slot in which the PSSCH is placed. The arrow from the PSSCH to the PSFCH indicates an example of a PSFCH associated with the PSSCH.

[0121] When the HARQ response in NR-V2X groupcast is groupcast option 2, which transmits an ACK or NACK, it is necessary to determine resources to be used for transmitting and receiving the PSFCH. As shown in FIG. 12 , in step S401, UE 200A, which is a transmitting UE 200, performs groupcast to UE 200B, UE 200C, and UE 200D, which are receiving UEs 200, via a Sidelink Shared Channel (SL-SCH). In the subsequent step S402, UE 200B uses PSFCH#B, UE 200C uses PSFCH#C, and UE 200D uses PSFCH#D to transmit a HARQ response to UE 200A. Here, as shown in the example of FIG. 12 , when the number of available PSFCH resources is smaller than the number of receiving UEs 200 belonging to the group, it is necessary to determine how to allocate the PSFCH resources. Note that the transmitting UE 200 may be aware of the number of receiving UEs 200 in the groupcast. In groupcast option 1, only NACK is transmitted as a HARQ response, and ACK is not transmitted.

[0122] FIG. 13 is a diagram illustrating an example of sensing operation in NR. In resource allocation mode 2, UE 200 selects resources for transmission. As shown in FIG. 13, UE 200 performs sensing in a sensing window within a resource pool. Through sensing, UE 200 receives a resource reservation field or a resource assignment field included in an SCI transmitted from another UE 200, and identifies available resource candidates within a resource selection window within the resource pool based on the field. Then, UE 200 randomly selects a resource from the available resource candidates.

[0123] 13, the resource pool configuration may have a period. For example, the period may be 10240 milliseconds. SL From slot t Tmax-1 SL In this example, the resource pool is set up to the period. The resource pool in each period may have an area set by, for example, a bitmap.

[0124] As shown in FIG. 13, the transmission trigger in UE 200 occurs in slot n, and the priority of the transmission is p TX The UE 200 transmits the data from slot n-T0 to slot nT proc,0 In the sensing window up to the slot immediately before the priority p RX When an SCI is detected within the sensing window and the RSRP (Reference Signal Received Power) is greater than a threshold, the resource in the resource selection window corresponding to the SCI is excluded. When an SCI is detected within the sensing window and the RSRP is less than a threshold, the resource in the resource selection window corresponding to the SCI is not excluded. The threshold is, for example, a priority p TX and priority p RX A threshold Th is set or defined for each resource in the sensing window based on pTX,pRX may be.

[0125] Also, slot t shown in FIG. m SL As such, resources in the resource selection window that are candidates for resource reservation information corresponding to resources in the sensing window that were not monitored, for example for transmission, are excluded.

[0126] In the resource selection window from slot n+T1 to slot n+T2, resources occupied by other UEs are identified, and the remaining resources are available resource candidates, as shown in Figure 13. The set of available resource candidates is denoted by S A Then, SA If the resource selection window is less than 20%, the threshold Th set for each resource in the sensing window is used. pTX,pRX The threshold Th may be increased by 3 dB and resource identification may be performed again. pTX,pRX By increasing the number of resources that are not excluded because their RSRP is less than the threshold, the set of resource candidates S A may be set to be 20% or more of the resource selection window. A If the resource selection window is less than 20%, the threshold Th set for each resource in the sensing window is used. pTX,pRX The operation of increasing the signal level by 3 dB and performing resource identification again may be repeated.

[0127] The lower layer of the UE 200 is A The upper layer of the UE 200 may report S A The UE 200 may perform a random selection on the upper layer to determine the resource to use. The UE 200 may perform the sidelink transmission using the determined resource. For example, the upper layer may be a MAC layer, and the lower layer may be a PHY layer or a physical layer.

[0128] In the above-mentioned Figure 13, the operation of the transmitting UE 200 is described, but the receiving UE 200 may detect data transmission from another UE 200 based on the results of sensing or partial sensing, and receive data from the other UE 200.

[0129] FIG. 14 is a flowchart showing an example of preemption in NR. FIG. 15 is a diagram showing an example of preemption in NR. As shown in FIG. 14 , in step S501, UE 200 performs sensing in a sensing window. If UE 200 performs a power saving operation, sensing may be performed in a predefined limited period. Next, UE 200 identifies each resource in the resource selection window based on the sensing result to generate a set of resource candidates S AThen, the UE 200 determines a set of resource candidates S A A resource set (r_0, r_1, ...) for determining whether preemption has occurred is selected from the resource set (r_0, r_1, ...) (S503). The resource set may be notified to the PHY layer from an upper layer as the resource for determining whether preemption has occurred.

[0130] In step S504, the UE 200 re-identifies each resource in the resource selection window based on the sensing result at the timing T(r_0)-T3 shown in FIG. 15 to generate a set of resource candidates S A , and further determines preemption for the resource set (r_0, r_1, ...) based on the priority. For example, in r_1 shown in FIG. 15, an SCI transmitted from another UE 200 is detected by re-sensing, and S A When preemption is enabled, if the value prio_RX indicating the priority of the SCI transmitted from the other UE 200 is lower than the value prio_TX indicating the priority of the transport block transmitted from the own terminal, the UE 200 determines that the resource r_1 has been preempted. Note that the lower the value indicating the priority, the higher the priority. In other words, if the value prio_RX indicating the priority of the SCI transmitted from the other UE 200 is higher than the value prio_TX indicating the priority of the transport block transmitted from the own terminal, the UE 200 determines that the resource r_1 has been preempted. A , pl_1 is not excluded from the list. Alternatively, if preemption is enabled only for a specific priority (for example, sl-PreemptionEnable is any of pl1, pl2, ..., pl8), this priority is set to prio_pre. In this case, if the value prio_RX indicating the priority of the SCI transmitted from the other UE 200 is lower than prio_pre and prio_RX is lower than the value prio_TX indicating the priority of the transport block transmitted from the own terminal, the UE 200 determines that the resource r_1 has been preempted.

[0131] In step S505, if preemption is determined in step S504, the UE 200 notifies the upper layer of preemption, causes the upper layer to reselect resources, and ends the preemption check.

[0132] In addition, when re-evaluation is performed instead of checking preemption, in step S504, the set S of resource candidates is A After determining S A If the resource set (r_0, r_1, ...) is not included in the resource set, the resource is not used and a resource reselection is performed in the upper layer.

[0133] In the NR sidelink, power saving based on random resource selection and partial sensing is specified. A UE 200 to which partial sensing is applied performs reception and sensing only in specific slots within a sensing window. That is, the UE 200 may perform partial sensing, which identifies resources by sensing only limited resources compared to full sensing, and selects resources from the identified resource set. Alternatively, the UE 200 may perform random selection, which uses the resources within the resource selection window as the identified resource set without excluding resources from the resource selection window.

[0134] Note that a method of performing random selection at the time of resource selection and using sensing information at the time of reevaluation or preemption check may be treated as partial sensing or as random selection.

[0135] The sensing operations may be 1) and 2) shown below. Note that sensing and monitoring may be interchangeable, and the sensing operations may include at least one of measuring received RSRP, obtaining reserved resource information, and obtaining priority information.

[0136] 1) Periodic-based partial sensing: In a mechanism where sensing is performed only on some slots, the sensing slots are determined based on a reservation periodicity. The reservation period is a value related to the resource reservation period field. The term "period" may be replaced with "periodicity."

[0137] 2) Contiguous partial sensing: In a mechanism where sensing is performed only on some slots, the sensing slots are determined based on aperiodic reservations. Note that aperiodic reservations are values ​​associated with the time resource assignment field.

[0138] In addition, multiple resource allocation methods can be configured for a resource pool. Also, as a power-saving function, SL-DRX (Discontinuous Reception) is supported. In other words, reception is performed only during a predetermined time period.

[0139] As described above, partial sensing is supported as one of the power saving functions. In a resource pool configured for partial sensing, the UE 200 may perform the above-described periodic partial sensing. The UE 200 may receive, from the gNB 100, information for configuring a resource pool configured for partial sensing and with periodic reservation enabled.

[0140] 16 is a diagram illustrating an example of periodic partial sensing. As shown in FIG. 16, Y candidate slots for resource selection are selected from a resource selection window [n+T1, n+T2].

[0141] t y SL is one of the slots included in the Y candidate slots, and ty-k×Preserve SLmay be used as a target slot for periodic partial sensing.

[0142] P reserve may correspond to all values ​​contained in a configured or predefined set sl-ResouceReservePeriodList. Alternatively, P may be limited to a subset of sl-ResouceReservePeriodList. reserve The value of P may be set or predefined. reserve The sl-ResouceReservePeriodList and sl-ResouceReservePeriodList may be configured for each transmission resource pool in resource allocation mode 2. Furthermore, the UE may implement monitoring of periods included in sl-ResouceReservePeriodList other than the limited subset. For example, the UE 200 may additionally monitor opportunities corresponding to P_RSVP_Tx.

[0143] Regarding the k value, the UE 200 may monitor the most recent sensing opportunity in a certain reservation cycle before slot n of the resource selection trigger or before the first slot of Y candidate slots subject to processing time limitations. The UE 200 may also additionally monitor periodic sensing opportunities corresponding to a set of 1 or more k values. For example, the k value may be set to a value corresponding to the most recent sensing opportunity in a certain reservation cycle before slot n of the resource selection trigger or before the first slot of Y candidate slots subject to processing time limitations, and a value corresponding to the sensing opportunity immediately before the most recent sensing opportunity in the certain reservation cycle.

[0144] As described above, partial sensing is supported as one of the power saving functions. In a resource pool configured for partial sensing, the UE 200 may perform the above-described continuous partial sensing. The UE 200 may receive, from the gNB 100, information for configuring a resource pool configured for partial sensing and with aperiodic reservation enabled.

[0145] Fig. 17 is a diagram for explaining an example of continuous partial sensing. As shown in Fig. 17, when the trigger for resource selection is slot n, UE 200 selects Y candidate slots for resource selection from the resource selection window [n+T1, n+T2]. Fig. 20 shows an example when Y = 7. As shown in Fig. 17, the beginning of the Y candidate slots is slot t y1 Then, the next slot is t y2 ..., the end of Y candidate slots is slot t yY It is written as follows.

[0146] The UE 200 receives the signal in the interval [n+T A , n+T B ], and n+T B or n+T B After (n+T C The resource selection is performed in the interval [n+T A , n+T B ]T A and T B can be any value, and n can be replaced with the index of any of the Y candidate slots.

[0147] Furthermore, the symbol [may be replaced with the symbol (and the symbol ] may be replaced with the symbol). For example, the interval [a, b] is the interval from slot a to slot b, and includes slot a and slot b. For example, the interval (a, b) is the interval from slot a to slot b, and does not include slot a and slot b.

[0148] The candidate resources to be selected are referred to as Y candidate slots, but all slots in the interval [n+T1, n+T2] may be candidate slots, or only some of the slots may be candidate slots.

[0149] Furthermore, inter-terminal coordination has been specified as a method for improving reliability and delay performance. For example, the inter-terminal coordination method 1 and inter-terminal coordination method 2 shown below have been specified. Hereinafter, the UE 200 that transmits coordination information will be referred to as UE-A, and the UE 200 that receives the coordination information will be referred to as UE-B.

[0150] Inter-UE coordination method 1) For UE-B's transmission, a preferred resource set and / or a non-preferred resource set is transmitted from UE-A to UE-B. Hereinafter, inter-UE coordination method 1 is also referred to as IUC scheme 1 (Inter-UE coordination scheme 1).

[0151] Inter-UE coordination method 2) UE-A transmits to UE-B information indicating resources indicated by the SCI received from UE-B where collision with other transmissions or receptions is expected and / or where collision has been detected. This information may be transmitted via the PSFCH. Hereinafter, inter-UE coordination method 2 is also referred to as IUC scheme 2 (Inter-UE coordination scheme 2).

[0152] In addition, SL communication may be applied to unlicensed bands, such as the 5 GHz-7 GHz band and the 60 GHz band.

[0153] (5) Problems Next, problems of the embodiment will be described.

[0154] Since existing technologies for SL communication are based on TN, there is room for consideration as to whether existing technologies for SL communication can be applied directly to NTN.

[0155] After careful consideration, the inventors have found the need to clarify a mechanism for appropriately executing SL communication with NTN in mind, for example, because cells belonging to NTN (NTN Cell) have a wider coverage area than cells belonging to TN (TN Cell).

[0156] (6) Operational Examples Next, operational examples of the embodiment will be described in light of the above-mentioned problems. The operational examples are as follows.

[0157] (6.1) Operation Example 1 In Operation Example 1, an overview of SL communication regarding NTN Cell will be explained.

[0158] In the first operational example, the UE 200 includes a receiving unit (e.g., a radio signal transmitting / receiving unit 210) that receives first information that identifies the target cell as a specific cell (NTN cell) belonging to a non-terrestrial network and second information that identifies that the target cell supports sidelink communication (SL communication). The gNB 100 includes a transmitting unit (e.g., a transmitting unit 120) that transmits the first information that identifies the target cell as a specific cell (NTN cell) belonging to a non-terrestrial network and the second information that identifies that the target cell supports sidelink communication (SL communication). The target cell may be interpreted as a certain cell, or as a cell from which the UE 200 can receive a broadcast signal (MIB / SIB / SSB, etc.).

[0159] The first information may be at least one of broadcast information (SIB1) including information indicating that the target cell is an NTN cell and broadcast information (NTN-specific SIB) including parameters used in the NTN cell. For example, the NTN-specific SIB may be referred to as SIB19.

[0160] The second information may be broadcast information (SL-specific SIB) including parameters used in SL communication. For example, the SL-specific SIB may be referred to as SIB12.

[0161] Here, the first information and the second information may be separate pieces of broadcast information. It should be noted that in the existing technology, an operation based on the first information and an operation based on the second information are assumed to be separate operations, and an operation based on both the first information and the second information is not assumed.

[0162] In the first operation example, the UE 200 includes a control unit (e.g., the control unit 270) that performs specific control regarding sidelink communication based on the first information and the second information. The gNB 100 includes a control unit (e.g., the control unit 130) that assumes that the UE 200 controls specific control regarding sidelink communication based on the first information and the second information.

[0163] The specific control regarding the sidelink communication may include the following options: The specific control according to the first operation example may be referred to as a first specific control.

[0164] In option 1-1, UE 200 capable of performing SL communication based on an NTN cell may perform Uu communication with the NTN cell based on an NTN-specific SIB and may perform SL communication based on an SL-specific SIB. In option 1-1, Mode 1 resource allocation (first method) or Mode 2 resource allocation (second method) may be assumed for SL communication.

[0165] According to Option 1-1, SL communication can be carried out under the control of an NTN Cell in an NTN Cell having a wide coverage area.

[0166] In option 1-2, the UE 200 may connect to the NTN cell and transmit information indicating whether or not to perform SL communication based on the SL-specific SIB (hereinafter referred to as first capability information). The UE 200 may connect to the NTN cell and transmit information indicating whether or not operation related to simultaneous execution of communication between the NTN cell and the UE 200 (Uu communication) and SL communication based on the SL-specific SIB is possible (hereinafter referred to as second capability information). The UE 200 may transmit both the first capability information and the second capability information. The first capability information and the second capability information may be examples of UE Capability. In option 1-2, Mode 1 resource allocation (first method) or Mode 2 resource allocation (second method) may be assumed for SL communication.

[0167] Note that simultaneous execution may mean performing SL communication in a state connected to an NTN cell (RRC Connected). Therefore, assuming a case where UE 200 operates in half-duplex, simultaneous execution does not necessarily mean performing Uu communication and SL communication at timings that overlap in time. Alternatively, simultaneous execution may mean performing Uu communication and SL communication at timings that overlap in time.

[0168] According to option 1-2, it is possible to appropriately determine the operation on the NW (NTN Cell) side for UE 200 that wants to perform SL communication.

[0169] In options 1-3, UE200 may receive information indicating whether UE200 performing SL communication based on the SL-specific SIB can connect to an NTN cell. When UE200 receives information indicating that it can connect to an NTN cell, UE200 may perform SL communication based on the SL-specific SIB in addition to communication between the NTN cell and UE200 (Uu communication). When UE200 receives information indicating that it cannot connect to an NTN cell, UE200 may perform either communication between the NTN cell and UE200 (Uu communication) or SL communication based on the SL-specific SIB. In options 1-3, Mode 1 resource allocation (first method) or Mode 2 resource allocation (second method) may be assumed for SL communication.

[0170] According to options 1-3, in the case where gNB100 does not support the operation related to the simultaneous execution of communication between NTN Cell and UE200 (Uu communication) and SL communication based on SL-specific SIB, SL communication assuming NTN can be properly executed.

[0171] In options 1-4, a UE 200 that does not support simultaneous execution of communication between an NTN cell and the UE 200 (Uu communication) and SL communication based on an SL-specific SIB may receive information indicating whether it can connect to an NTN cell. When the UE 200 receives information indicating that it can connect to an NTN cell, it may perform SL communication based on an SL-specific SIB in addition to communication between the NTN cell and the UE 200 (Uu communication). When the UE 200 receives information indicating that it cannot connect to an NTN cell, it may perform either communication between the NTN cell and the UE 200 (Uu communication) or SL communication based on an SL-specific SIB. In options 1-4, Mode 1 resource allocation (first method) or Mode 2 resource allocation (second method) may be assumed for SL communication.

[0172] Options 1-4 make it possible to avoid a situation in which a UE200 that does not support quality improvement operations related to simultaneous execution of communication between an NTN Cell and UE200 (Uu communication) and SL communication based on an SL-specific SIB connects to an NTN Cell.

[0173] Options 1-5 describe SL communication between a UE 200 that performs SL communication based on an NTN cell and a UE 200 that performs SL communication not based on an NTN cell. The SL communication based on an NTN cell may be Mode 1 resource allocation (first method) or Mode 2 resource allocation (second method) based on parameters set via the NTN cell. The SL communication not based on an NTN cell may be Mode 1 resource allocation (first method) or Mode 2 resource allocation (second method) based on parameters that are not set via the NTN cell (e.g., parameters set via a TN cell, pre-set parameters). In options 1-5, a UE 200 that performs SL communication based on an NTN cell may perform the following operations.

[0174] In option 1-5-1, the UE 200 may perform SL communication using resources for SL communication that are not based on an NTN cell (for example, a pre-configuration resource pool). The following options are possible for such SL communication.

[0175] In option 1-5-1-1, UE 200 may transmit SL communication without receiving SL communication, UE 200 may receive SL communication without transmitting SL communication, or UE 200 may both transmit and receive SL communication.

[0176] In option 1-5-1-2, UE 200 may simultaneously perform SL communication based on an NTN cell and SL communication not based on an NTN cell. In such a case, UE 200 may prioritize one of the SL communications when the SL communication based on an NTN cell and the SL communication not based on an NTN cell overlap in time. For example, SL communication based on an NTN cell may be prioritized over SL communication not based on an NTN cell.

[0177] In option 1-5-1-3, the UE 200 may switch between SL communication based on the NTN cell and SL communication not based on the NTN cell. In such a case, the switching may be performed by the implementation of the UE 200. The switching may be performed based on the presence or absence of transmission data in each SL communication. The switching may be performed based on the connection status with other UEs 200 that perform SL communication.

[0178] In option 1-5-2, UE200 may not perform SL communication using resources for SL communication not based on an NTN cell (e.g., a pre-configuration resource pool). For example, when UE200 receives an SL-specific SIB (SIB12) from an NTN cell, UE200 does not perform SL communication using resources for SL communication not based on an NTN cell (e.g., a pre-configuration resource pool).

[0179] In option 1-5-3, UE 200 may be configured or informed as to whether option 1-5-1 or option 1-5-2 is to be applied.

[0180] (6.2) Operation Example 2 In Operation Example 2, an overview of SL communication in Mode 1 resource allocation (first method) will be described.

[0181] In the second operational example, the UE 200 includes a receiver (e.g., a radio signal transceiver 210) that receives information indicating resources for sidelink communication in a specific cell (NTN cell) belonging to a non-terrestrial network. The gNB 100 includes a transmitter (e.g., a transmitter 120) that transmits information indicating resources for sidelink communication in a specific cell (NTN cell) belonging to a non-terrestrial network.

[0182] In the second example operation, the UE 200 includes a controller (the controller 270) that performs specific control on the sidelink communication when a specific cell allocates resources for the sidelink communication. The gNB 100 includes a controller (e.g., the controller 130) that assumes that the UE 200 performs specific control on the sidelink communication when a specific cell allocates resources for the sidelink communication.

[0183] In the second operation example, the information indicating the resources for sidelink communication may be DCI (DCI Format 3_0 / 3_1). "The resources for sidelink communication are allocated by a specific cell" may mean that Mode 1 resource allocation (first method) is applied, or that the resources for SL communication are allocated by DCI. The second operation example may be applied to a case where the UE 200 performs an operation or control related to the SL communication of another UE 200 based on a notification from a NW (NTN Cell).

[0184] The specific control for sidelink communication may include the following options. The specific control according to Operation Example 2 may be referred to as second specific control. Note that Operation Example 2 may be based on the above-described Operation Example 1.

[0185] In option 2-1, the UE 200 may perform, as the second specific control, control to determine the timing of transmitting feedback (HARQ-ACK) regarding the SL communication to the NTN Cell based on a specific parameter in the NTN Cell. Transmitting to the NTN Cell may mean transmitting to the gNB 100. The specific parameter may be K_offset.

[0186] Option 2-1-1 describes the operation of UE 200A when SL communication is performed between UE 200A and UE 200B and resources for SL communication are allocated, as shown in FIG. 18 . Specifically, UE 200A receives DCI (e.g., DCI Format 3_0) that schedules resources for SL communication. UE 200A receives HARQ-ACK from UE 200B via a PSFCH (Physical Sidelink Feedback Channel) corresponding to a PSSCH (Physical Sidelink Shared Channel) transmitted using resources scheduled by the DCI. UE 200A determines the timing of transmitting the HARQ-ACK received from UE 200B to the NTN Cell, using K_offset used in Uu communication between the NTN Cell and UE 200.

[0187] The timing of transmitting the HARQ-ACK to the NTN cell may be expressed in PUCCH / PUSCH slot, where PUCCH / PUSCH slot = n + k + 2^μ-μ K_offset ・It may be expressed as K_offset.

[0188] n is the last slot of the PSFCH Rx occasion.

[0189] K is the value of the PSFCH-to-HARQ feedback timing indicator field.

[0190] μ is the SCS setting for PUCCH / PUSCH transmission.

[0191] μ K_offset may be zero in FR1.

[0192] The coefficient of K_offset may be different from the coefficient used in Uu communication between the NTN Cell and UE200 that is not related to the sidelink.

[0193] Option 2-1-2 describes an operation of UE 200B when SL communication is being performed between UE 200A and UE 200B and UE 200B receives an SL signal from UE 200A to which resources for SL communication are allocated, as shown in Fig. 19. Specifically, UE 200B receives a PSSCH transmitted to UE 200A using resources scheduled by DCI (e.g., DCI Format 3_0). UE 200B determines the timing of transmitting a HARQ-ACK to the NTN Cell using K_offset used in Uu communication between the NTN Cell and UE 200 (i.e., K_offset applied to UE 200A).

[0194] The timing of transmitting the HARQ-ACK to the NTN cell may be expressed in PUCCH / PUSCH slot, where PUCCH / PUSCH slot = n + k + 2^μ-μ K_offset ・It may be expressed as K_offset.

[0195] n is the last slot of the PSFCH Tx occasion or the PSSCH Rx occasion.

[0196] K is the value of the PSFCH-to-HARQ feedback timing indicator field or the PSSCH-to-HARQ feedback timing indicator field.

[0197] μ is the SCS setting for PUCCH / PUSCH transmission.

[0198] μ K_offset may be zero in FR1.

[0199] The coefficient of K_offset may be different from the coefficient used in Uu communication between the NTN Cell and UE200 that is not related to the sidelink.

[0200] Here, UE200B does not know parameters (e.g., PSFCH resource, k, K_offset) used to determine the timing to transmit HARQ-ACK to NTN Cell. Therefore, UE200A notifies UE200B of parameters (e.g., PSFCH resource, k, K_offset) used to determine the timing to transmit HARQ-ACK to NTN Cell. Although not particularly limited, the parameters (e.g., PSFCH resource, k, K_offset) may be notified by S-SSB, PSSCH, or PSCCH transmitted from UE200A to UE200.

[0201] In option 2-1-3, K_offset may be set or notified as a common value to the NTN cell. In other words, K_offset may be set or notified by common signaling to the NTN cell (cell common signaling). K_offset may be set or notified as an individual value to the UE 200. In other words, K_offset may be set or notified by dedicated signaling to the UE 200 (UE dedicated signaling).

[0202] The signaling may be signaling of any of the RRC, MAC CE, and PHY layers.

[0203] The K_offset for the PUCCH / PUSCH transmitting the HARQ-ACK related to SL communication may be configured or notified in common with the K_offset for the PUCCH / PUSCH transmitting the HARQ-ACK related to DL communication. With this configuration, it is possible to reduce the overhead of the NTN Cell.

[0204] The K_offset for the PUCCH / PUSCH transmitting the HARQ-ACK for SL communication may be configured or signaled separately from the K_offset for the PUCCH / PUSCH transmitting the HARQ-ACK for DL ​​communication. With this configuration, it is possible to improve the flexibility and optimize the timing of transmitting the HARQ-ACK for SL communication.

[0205] The value of K_offset for the PUCCH / PUSCH transmitting the HARQ-ACK for SL communication may be different from the value of K_offset for the PUCCH / PUSCH transmitting the HARQ-ACK for DL ​​communication.

[0206] According to Option 2-1, even in an NTN Cell where propagation delay is expected to be large, the NTN Cell can instruct the timing of transmitting the HARQ-ACK for SL communication, and can grasp the timing of receiving the HARQ-ACK for SL communication.

[0207] In option 2-2, the UE 200 may execute, as the second specific control, a control to report a timing advance (TA) to be applied to a UL signal for the NTN cell. The report destination may be the gNB 100 or another UE 200. The following options are possible for reporting the TA.

[0208] In option 2-2-1, the UE 200 may perform TA reporting in the following manner.

[0209] In option 2-2-1-1, the UE 200 may periodically report the TA. The periodic reporting of the TA and the TA reporting period may be configured by the gNB 100. The UE 200 may report the TA using the MAC-CE.

[0210] In option 2-2-1-2, the UE 200 may report the TA semi-persistently. The semi-persistent reporting of the TA and the TA reporting period may be configured by the gNB 100. The semi-persistent reporting of the TA may be activated or released by the MAC-CE, the DCI, or the like. When the semi-persistent reporting of the TA is activated, the UE 200 may perform the TA reporting until the semi-persistent reporting of the TA is released. The UE 200 may release the semi-persistent reporting of the TA when the RRC connection is terminated, or may release the semi-persistent reporting of the TA when a release command is received. The UE 200 may report the TA using the MAC-CE.

[0211] In option 2-2-1-3, the UE 200 may report the TA by physical layer signaling instead of MAC-CE. The UE 200 may report the TA periodically as in option 2-2-1-1, or may report the TA semi-persistently as in option 2-2-1-2. The UE 200 may trigger the TA report by an event as in option 2-2-1-4 described later. The TA may be reported as a type of UCI (e.g., CSI) on the PUCCH or PUSCH. The TA report type (e.g., TA report) may be defined as a type of CSI and may be associated with a specific priority.

[0212] In option 2-2-1-4, the UE 200 triggers the reporting of the TA by an event. The UE 200 may report the TA using MAC-CE or physical layer signaling.

[0213] The events include overlap of SL / UL for Half Duplex (hereinafter referred to as HD), priority control of SL / UL for HD, reception of a TA report request, detection that the SL / UL gap is below a predetermined threshold, and N TA,common The specific threshold may be a threshold for the NTN. The specific threshold may be a value smaller than the threshold used to determine whether a TA is reported in the TN. The specific threshold may be referred to as offsetThresholdTA-r19.

[0214] In addition, in the case where SL / UL overlap occurs regarding HD and UL Tx is given priority, UL Tx may include priority-related information described later, may include TA together with priority-related information described later, or may include TA instead of priority-related information described later.

[0215] In addition, when SL / UL overlap occurs regarding HD and a HARQ-ACK regarding SL communication is transmitted to gNB100, the HARQ-ACK transmitted to gNB100 may include priority-related information described later, may include a TA together with the priority-related information described later, or may include a TA instead of the priority-related information described later.

[0216] In option 2-2-1, two or more options selected from options 2-2-1-1 to 2-2-1-4 may be combined.

[0217] In option 2-2-1, the TA reporting period used in option 2-2-1-1 or option 2-2-1-2 may be changed by a parameter related to the satellite 150. For example, the higher the altitude of the satellite 150, the shorter the TA reporting period may be.

[0218] Option 2-2-2 explains the content of the TA report explained in Option 2-2-1. The following options are possible for the content of the TA report.

[0219] In option 2-2-2-1, the granularity of the TA value may be symbol, μs, ns, etc. The granularity of the TA value reported in NTN may be finer than the granularity of the TA value reported in TN.

[0220] In option 2-2-2-2-, the TA report may include information indicating the difference between the previous TA report value and the current TA value.

[0221] In option 2-2-2-3, the TA report content may include a predicted value of future TA. Option 2-2-2-3 may be applied only to UE 200 that is not moving, or may be applied only to UE 200 that is moving at a speed equal to or less than a threshold. The TA report content may include a predicted value of TA for one or more timings in the future. The TA report content may include, along with the predicted value of TA, parameters related to the coefficient of a first-order term and the coefficient of a second-order term that indicate a change in TA, and N TA,common The parameters may be similar to the parameters related to the above.

[0222] In Option 2-2-2-4, the TA report will be replaced by the TA value (or predicted value) and will include the N TA,UE-specific It may also include the value (or predicted value) of

[0223] In option 2-2-2-5, the TA report may include the geographical location (e.g., longitude, latitude, altitude, etc.) of UE 200 instead of the TA value (or predicted value).

[0224] In Option 2-2-2-6, the TA report may include a representative, average, maximum, or minimum value of two or more TA values ​​(or forecast values) over a period of time. The TA report may also include a range of two or more TA values ​​(or forecast values) over a period of time.

[0225] In option 2-2, UE 200 (HD capable) that reports TA does not need to assume SL / UL overlap.

[0226] In option 2-2, two or more options selected from options 2-2-2-1 to 2-2-2-6 may be combined.

[0227] In option 2-2, options 2-2-2-1 to 2-2-2-3 may be applied to existing reporting or signaling.

[0228] According to Option 2-2, the gNB100 can determine the TA value to be applied to the UL signal for the NTN Cell, thereby suppressing SL / UL overlap.

[0229] In option 2-3, the UE 200 may perform a second specific control to resolve the time overlap between the uplink signal and the sidelink signal by using a priority control. The priority control may be an existing priority control, or a priority control different from the existing priority control. The existing priority control may be a priority control for resolving the time overlap between the uplink signal and the sidelink signal.

[0230] In option 2-4, when a time overlap occurs between UL Tx and SL Tx, UE200 may perform a second specific control, which is to control reporting (priority-related information) from UE200 to gNB100.

[0231] In option 2-4-1, the UE 200 performs a report to the gNB 100 when an overlap occurs. The report content may include information indicating that an overlap has occurred, or that priority control has occurred. The report content may include information indicating the timing at which the overlap (priority control) occurred. The report content may include information indicating the channel / signal in which the overlap (priority control) occurred. The report content may include information regarding the time of the overlap (SL / UL time gap) (e.g., the start timing and duration of the overlap). The report content may include information indicating a prioritized channel / signal, or information indicating a canceled or postponed channel / signal.

[0232] In option 2-4-2, the UE 200 may perform the report by RRC signaling. The UE 200 may perform the report by MAC-CE signaling. In such a case, the UE 200 may perform the report together with a TA report or the like. The UE 200 may perform the report by physical layer signaling. In such a case, the UE 200 may perform the report by CSI together with a TA report, or may perform the report (e.g., one-bit information indicating that overlap has occurred) together with HARQ-ACK in a manner similar to HARQ-ACK / SR.

[0233] In addition, for physical layer signaling, if periodic PUCCH resources are defined / configured similarly to SR, reporting may be performed using the earliest resource after overlap (priority control) occurs.

[0234] In options 2-4, the UE 200 may perform reporting not only when overlap (priority control) occurs but also when the SL / UL gap (the difference between the end timing of one communication and the start timing of the other communication) is smaller than a threshold. The threshold may be predefined in the wireless communication system 10 or may be set by the RRC. The case where overlap (priority control) occurs may be interpreted as the case where the SL / UL gap is small.

[0235] In option 2-4, the condition for reporting an overlap may be used as a trigger for reporting the TA described in option 2-4-1 (event of option 2-4-1-4). For example, when reporting an overlap, the TA described in 2-2-1 may also be executed.

[0236] In options 2-4, the overlap report may be performed in the case where the SL Tx is prioritized. That is, the overlap report may be performed in the case where the UL Tx is canceled or postponed. In other words, the overlap report may be omitted in the case where the SL Tx is canceled or postponed.

[0237] According to option 2-4, information regarding SL / UL overlap occurring on the UE200 side can be obtained by the gNB100 side or the UE200, thereby making it possible to suppress SL / UL overlap.

[0238] In option 2-5, the UE 200 may execute, as the second specific control, a control to use the TA used in the UL communication in the SL communication. Such control may include the following options.

[0239] In option 2-5-1, the UE 200 may use the TA used in the UL communication in the SL communication when performing synchronization processing based on a signal from the GNSS / gNB 100. When using the TA used in the UL communication in the SL communication, the UE 200 may omit transmission or reception of an S-SSB (Sidelink-Synchronization Signal Block).

[0240] Here, the priority of S-SSB may be lower than the priority of signals from GNSS, and may be lower than the priority of signals from gNB100 (e.g., SSB).

[0241] In option 2-5-2, the TA value applied to SL communication may be shared between UEs 200. The TA value applied to SL communication may be shared by transmission of S-SSB.

[0242] When performing synchronization processing using S-SSB, the UE 200 may identify the frame timing of the SL communication based on the reception timing of the S-SSB and the shared TA value.

[0243] The TA value applied in the SL communication may be a shared TA value, not a TA value that the UE 200 itself has.

[0244] According to option 2-5, the Tx timing and SL frame timing of UE200 are aligned, so the gNB can determine whether SL / UL overlap will occur.

[0245] In option 2-6, the UE 200 determines, as the second specific control, whether to transmit a HARQ-ACK related to the SL communication to the NTN cell. As a method of determination, the following options are possible.

[0246] In option 2-6-1, UE200 determines whether to transmit a HARQ-ACK for SL communication to the NTN Cell based on higher layer parameters (HARQ feedback enabling / disabling configuration per HARQ process).

[0247] For example, UE 200 determines whether to transmit a HARQ-ACK for SL communication to the NTN Cell based on the HARQ process number notified by the DCI (DCI Format 3_0) that schedules SL communication.

[0248] The upper layer parameters for SL HARQ-ACK may be configured in common with the upper layer parameters for DL ​​HARQ-ACK. The upper layer parameters for SL HARQ-ACK may be configured separately from the upper layer parameters for DL ​​HARQ-ACK. In such a case, UE 200 may determine that the upper layer parameters are configured separately when both the upper layer parameters for SL HARQ-ACK and the upper layer parameters for DL ​​HARQ-ACK are configured. UE 200 may determine that the upper layer parameters are configured in common when either the upper layer parameters for SL HARQ-ACK or the upper layer parameters for DL ​​HARQ-ACK are configured.

[0249] UE 200 may omit transmission of HARQ-ACK for SL communication when both the value of the PRI (PUCCH Resource Indicator) field of DCI and the value of the PSFCH-to-HARQ feedback timing indicator field are 0. However, such an interpretation is not applied, and UE 200 may transmit HARQ-ACK for SL communication using PUCCH / PUSCH resources based on the value of the PRI field and the value of the PSFCH-to-HARQ feedback timing indicator field.

[0250] In option 2-6-2, UE 200 determines whether to transmit HARQ-ACK for SL communication to the NTN Cell, regardless of higher layer parameters (HARQ feedback enabling / disabling configuration per HARQ process).

[0251] For example, UE 200 may omit transmission of HARQ-ACK for SL communication when both the value of the PRI field of DCI and the value of the PSFCH-to-HARQ feedback timing indicator field are 0. UE 200 may transmit HARQ-ACK for SL communication when both the value of the PRI field of DCI and the value of the PSFCH-to-HARQ feedback timing indicator field are not 0.

[0252] Option 2-6-3 may be configured, notified, or determined as to which of Option 2-6-1 and Option 2-6-2 to apply. For example, if a higher layer parameter (HARQ feedback enabling / disabling configuration per HARQ process) is configured, Option 2-6-1 may be applied, and if the higher layer parameter is not configured, Option 2-6-2 may be applied.

[0253] Option 2-6 provides the following advantages. Specifically, option 2-6-1 allows the mechanism of HARQ-ACK feedback for SL communication to be the same as the mechanism of HARQ-ACK feedback for DL ​​communication. Option 2-6-2 allows the mechanism of HARQ-ACK feedback for SL communication of NTN to be the same as the mechanism of HARQ-ACK feedback for SL communication of TN.

[0254] In option 2-7, UE capabilities related to one or more options selected from option 2-1 to option 2-6 may be defined. UE 200 may report the UE capabilities to gNB 100. The options to be applied to UE 200 from option 2-1 to option 2-6 may be determined based on the UE capabilities.

[0255] (6.3) Operation Example 3 In Operation Example 3, an overview of SL communication in Mode 2 resource allocation (second method) will be described.

[0256] In the third operation example, the UE 200 includes a communication unit (e.g., a radio signal transceiver 210) that transmits an uplink signal to a specific cell (NTN cell) belonging to a non-terrestrial network and performs sidelink communication. The gNB 100 includes a receiving unit (e.g., a receiving unit 110) that receives an uplink signal to a specific cell (NTN cell) belonging to a non-terrestrial network.

[0257] In the third operational example, the UE 200 includes a control unit (control unit 270) that performs specific control regarding uplink signal transmission and sidelink communication when autonomously selecting resources for sidelink communication. The gNB 100 includes a control unit (e.g., control unit 130) that assumes that the UE 200 performs specific control regarding uplink signal transmission and sidelink communication when autonomously selecting resources for sidelink communication.

[0258] In the operation example 3, "autonomously selecting resources for sidelink communication" may mean applying Mode 2 resource allocation (second method) or determining resources based on reservation information of another UE 200. The operation example 3 may be applied to a case where the UE 200 performs an operation or control related to the SL communication of another UE 200 based on a notification from a NW (NTN Cell).

[0259] Operation example 3 may be applied when the band / carrier / FR / cell of SL / UL is the same. Operation example 3 may be applied to a band / carrier / FR combination in which there is a restriction on simultaneous execution of SL communication and UL transmission. Operation example 3 may be applied to a band / carrier / FR combination in which priority control is performed for SL communication and UL transmission.

[0260] Operation example 3 may be applied to SL transmission without being applied to SL reception. Operation example 3 may be applied to SL reception without being applied to SL transmission. Operation example 3 may be applied to both SL transmission and SL reception.

[0261] In addition, in operation example 3, we mainly consider the case where overlap between SL communication and UL transmission occurs in NTN Cell, as shown in Fig. 20. In NTN Cell, repeated UL transmission (8 rep, 4 rep in Fig. 20) is assumed, so it is expected that there will be an increase in the number of cases where overlap between SL communication and UL transmission occurs.

[0262] When SL communication and UL transmission overlap, it becomes necessary to drop either one of the SL communication or the UL transmission, or to reduce the power of either one of the SL communication or the UL transmission, which may result in a deterioration in communication quality. Furthermore, assuming half-duplex, sensing for selecting resources for SL communication cannot be performed in the UL transmission section, which may result in a collision of SL communication between UEs 200.

[0263] In order to solve such problems, specific control is performed on uplink signal transmission and sidelink communication. The specific control may include the following options. The specific control according to Operation Example 3 may be referred to as third specific control. Note that Operation Example 3 may be based on the above-described Operation Example 1.

[0264] In option 3-1, as shown in Fig. 21 , UE 200 may execute, as a third specific control, control to exclude resources for SL communication that overlap in time with resources for UL signals from candidates for resources for SL communication (selection window in Fig. 21 ). Option 3-1 may include the following options.

[0265] In option 3-1-1, UE 200 may exclude resources for SL communication that overlap in time with switching times provided before resources for UL signals. UE 200 may exclude resources for SL communication that overlap in time with switching times provided after resources for UL signals. UE 200 may exclude resources for SL communication that overlap in time with switching times provided before and after resources for UL signals.

[0266] In option 3-1-2, the UE 200 identifies the timing of the UL signal resource that overlaps with the candidate resource for the SL communication based on the TA. The following options are possible for the TA.

[0267] In option 3-1-2-1, UE 200 may predict a TA of a future timing at which SL communication is expected based on at least one of the common TA and orbital information of satellite 150. UE 200 may determine the timing of resources for the UL signal based on the predicted TA.

[0268] In option 3-1-2-2, UE 200 may determine the timing of the resources for the UL signal based on the TA of the timing for selecting resources for the SL communication.

[0269] In option 3-1-2-3, when UE 200 performs an operation (re-evaluation, pre-emption check) to check whether the selected or reserved resource is available, UE 200 may determine the timing of the resource for the UL signal based on a TA different from the TA used in resource selection. The TA different from the TA used in resource selection may be the TA at the timing of performing re-evaluation or pre-emption check.

[0270] When UE200 reacquires the common TA, the orbital information of satellite 150, or the GNSS position information, UE200 may perform an operation (re-evaluation, pre-emption check) to check whether the selected or reserved resources are available for use.

[0271] When the change in TA exceeds a threshold, the UE 200 may perform an operation (re-evaluation, pre-emption check) to check whether the selected or reserved resources are available for use. The threshold may be predefined in the wireless communication system 10, or may be set or notified by the NTN Cell.

[0272] When a timer that measures the validity period of the common TA or the orbital information of satellite 150 expires, UE 200 may perform an operation (re-evaluation, pre-emption check) to check whether the selected or reserved resources are available for use.

[0273] In option 3-1-3, the UE 200 operating in half-duplex mode may cancel resource selection when a specific condition caused by half-duplex is satisfied. The UE 200 operating in half-duplex mode may perform an operation of selecting resources for SL communication (random selection) without sensing when a specific condition is satisfied. The UE 200 operating in half-duplex mode may select resources for SL communication from a predetermined specific resource pool (exceptional pool) when a specific condition is satisfied.

[0274] The specific condition may include a condition that the number of candidate slots for SL communication resources is equal to or less than a predetermined threshold due to a slot (half-duplex slot) where sensing could not be performed by half-duplex. The specific condition may also be interpreted as a condition that omits the operation of excluding SL communication resources corresponding to half-duplex slots. The specific condition may include a condition that the number of slots where half-duplex is caused by UL transmission is equal to or greater than a predetermined threshold. The specific condition may also include a condition that the ratio of the number of slots where half-duplex is caused by UL transmission to the total number of candidate slots or the total number of half-duplex slots for SL communication resources is equal to or greater than a predetermined ratio. A plurality of the above-mentioned specific conditions may be combined.

[0275] Option 3-1 allows for the avoidance of overlap between SL communication and UL transmission.

[0276] In option 3-2, the UE 200 may execute control to report information related to SL communication as a third specific control. The information related to SL communication may include the following options. Note that the report destination may be the gNB 100 or another UE 200.

[0277] In option 3-2-1, the information about the SL communication may include a time interval X during which an operation related to the SL communication is performed. The time interval X may be a time interval determined by the UE 200, may be a time interval from when data to be transmitted in the SL communication is generated until when there is no more data to be transmitted in the SL communication, or may be a time interval during which the SL communication is desired to be performed. The time interval during which the SL communication is desired to be performed may or may not include a sensing time.

[0278] In option 3-2-2, the information about SL communication may include the priority-related information described in option 2-4, and may also include the information described in option 2-2 or option 2-3 above.

[0279] In option 3-2-3, the information regarding SL communication may include a time interval Y during which the NTN cell is in RRC IDLE / INACTIVE or SCell INACTIVE to perform SL communication. Time interval Y may have the same value as time interval X described in option 3-2-1.

[0280] In option 3-2-4, the information regarding SL communication may include information regarding selected or reserved SL communication resources, which may include time resources, time periodicity of the resources, end times of the resources, and priorities of the resources.

[0281] According to option 3-2, information regarding SL communication is reported to gNB100, thereby suppressing overlap between SL communication and UL transmission at gNB100.

[0282] In option 3-3, UE200 may perform operations related to simultaneous execution of SL communication and UL transmission when the NTN Cell supports operations related to simultaneous execution of SL communication and UL transmission.

[0283] In Option 3-4, as shown in Fig. 22 , when the NTN Cell does not support operations related to simultaneous execution of SL communication and UL transmission, the UE 200 does not perform UL transmission in a first specific time interval P in which operations related to SL communication are performed, and does not perform SL communication in a second specific time interval Q in which UL transmission is performed. Specifically, the UE 200 may turn off functions related to UL transmission (e.g., may transition to RRC INACTIVE) in the first specific time interval P in which SL communication is performed. The UE 200 may turn off functions related to SL communication in the second time interval Q in which UL transmission (UL TX) is performed.

[0284] Note that the operation related to SL communication may be interpreted as an operation related to SL transmission. In such a case, the operation related to SL transmission may include sensing. The operation related to SL transmission may not include SL reception other than sensing. In other words, the operation related to SL transmission may be considered as an operation related to SL transmission that UE 200 itself performs.

[0285] First, UL transmission is not performed during a first specific time period P during which SL communication is performed. During the first specific time period P, UE 200 transitions to RRC IDLE, RRC INACTIVE, or SCell INACTIVE. During the first specific time period P, not only UL transmission but also operations related to initial access may not be performed. Upon expiration of the first specific time period P during which SL communication is performed, UE 200 may transition to RRC CONNECTED, or may perform operations related to SCell activation, or may perform operations related to RRC resume.

[0286] The first specific time interval P may be a time interval determined by the UE 200, or may be a time interval from when data to be transmitted in SL communication is generated until when there is no more data to be transmitted in SL communication.

[0287] Second, during the second specific time period Q in which UL transmission is performed, no operation related to SL communication (for example, operation related to SL transmission) is performed.

[0288] UE 200 performs an operation related to SL communication so that UL transmission does not occur in a slot having a resource for UL transmission. The slot having a resource for UL transmission may include a slot for performing sensing (sensing slot) or may include a slot that is a candidate resource for SL communication.

[0289] Note that overlap between SL communication and UL transmission may be permitted up to a specific number of slots, or up to a specific ratio of the number of slots available for communication (e.g., the total number of candidate slots for SL communication resources).

[0290] The second specific time interval Q may be a time interval for RRC CONNECTED. The second specific time interval Q may include a time interval for an operation related to initial access. The second specific time interval Q may be a time interval set or notified by the NW (NTN Cell).

[0291] According to option 3-4, the operation of UE 200 that does not support the operation related to the simultaneous execution of SL communication and UL transmission is clarified, so that the quality degradation due to the simultaneous execution of SL communication and UL transmission can be suppressed.

[0292] In option 3, whether or not to apply operation example 3 to UE 200 may be set or notified by the NW (NTN Cell). The option to be applied to UE 200 from option 3-1 to option 3-4 may be set or notified by the NW (NTN Cell).

[0293] In Option 3, Operation Example 3 may be applied to either Periodic SL transmission or Aperiodic SL transmission, or may be applied to both Periodic SL transmission and Aperiodic SL transmission. The option applied to Periodic SL transmission may be the same as the option applied to Aperiodic SL transmission, or may be different from the option applied to Aperiodic SL transmission.

[0294] (7) Actions and Effects In the embodiment, the UE 200 executes the first specific control regarding the SL communication based on the first information (e.g., SIB1 / SIB19) and the second information (e.g., SIB12). With this configuration, the UE 200 can appropriately execute the SL communication assuming the NTN, taking into account that the first information and the second information are separate broadcast information.

[0295] In the embodiment, the UE 200 executes the second specific control for the SL communication when the SL communication resource is allocated by the NTN cell. With this configuration, the operation of the SL communication in Mode 1 resource allocation (first method) in the NTN is clarified, and the SL communication can be appropriately executed assuming the NTN.

[0296] In the embodiment, when the UE 200 autonomously selects resources for SL communication, the UE 200 performs specific control regarding UL transmission and SL communication. With this configuration, the operation of SL communication in Mode 2 resource allocation (second method) in the NTN is clarified, and therefore, the SL communication can be appropriately performed assuming the NTN.

[0297] (8) Other Embodiments The contents of the present invention have been described above in accordance with the embodiments, but it will be obvious to those skilled in the art that the present invention is not limited to these descriptions and that various modifications and improvements are possible.

[0298] In the above disclosure, a case has been exemplified in which the non-terrestrial network device that relays the UL signal or DL ​​signal in the NTN is the satellite 150. However, the above disclosure is not limited to this. The non-terrestrial network device may be any node that constitutes the NTN in the air, and may be referred to as an aerial node, a floating body, or an aerial vehicle.

[0299] Although not specifically mentioned in the above disclosure, the following UE capabilities may be defined. The following UE capabilities may be reported from the UE 200 to the gNB 100.

[0300] In the above disclosure, configure, activate, update, indicate, enable, specify, and select may be interchangeable. Similarly, link, associate, correspond, and map may be interchangeable, and allocate, assign, monitor, and map may be interchangeable.

[0301] Furthermore, specific, dedicated, UE-specific, and UE-dedicated may be interchangeable. Similarly, common, shared, group-common, UE-common, and UE-shared may be interchangeable.

[0302] The block diagrams (FIGS. 4-6) used to explain the above-described embodiments show functional blocks. These functional blocks (components) are realized by any combination of hardware and / or software. Furthermore, the method for realizing each functional block is not particularly limited. That is, each functional block may be realized using a single device that is physically or logically coupled, or may be realized using two or more physically or logically separated devices that are directly or indirectly connected (e.g., wired, wireless, etc.) and these multiple devices. The functional block may also be realized by combining software with the single device or multiple devices.

[0303] Functions include, but are not limited to, judgment, determination, judgment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, election, establishment, comparison, assumption, expectation, regard, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assignment. For example, a functional block (component) that performs transmission is called a transmitting unit or transmitter. As mentioned above, there are no particular limitations on how each is implemented.

[0304] Furthermore, the above-described gNB 100, UE 200, and LMF 300 (the devices) may function as a computer that performs processing of the wireless communication method of the present disclosure. Figure 23 is a diagram showing an example of the hardware configuration of the devices. As shown in Figure 23, the devices may be configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0305] In the following description, the term "apparatus" can be interpreted as a circuit, a device, a unit, etc. The hardware configuration of the apparatus may be configured to include one or more of the apparatuses shown in the drawings, or may be configured to exclude some of the apparatuses.

[0306] Each functional block of the device (see FIGS. 4 to 6) is realized by any hardware element of the computer device or a combination of the hardware elements.

[0307] In addition, each function of the device is realized by loading specified software (programs) onto hardware such as processor 1001 and memory 1002, causing processor 1001 to perform calculations, control communication via communication device 1004, and control at least one of reading and writing data in memory 1002 and storage 1003.

[0308] The processor 1001 controls the entire computer by running, for example, an operating system, and may be configured as a central processing unit (CPU) including an interface with peripheral devices, a control unit, an arithmetic unit, and registers.

[0309] The processor 1001 also reads programs (program codes), software modules, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and executes various processes in accordance with these. The programs used are those that cause a computer to execute at least some of the operations described in the above-described embodiments. Furthermore, the various processes described above may be executed by one processor 1001, or may be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 may be implemented by one or more chips. The programs may be transmitted from a network via a telecommunications line.

[0310] The memory 1002 is a computer-readable recording medium and may be configured by at least one of, for example, a read-only memory (ROM), an erasable programmable ROM (EPROM), an electrically erasable programmable ROM (EEPROM), a random access memory (RAM), etc. The memory 1002 may also be called a register, a cache, a main memory (primary storage device), etc. The memory 1002 may store a program (program code), a software module, etc., capable of executing a method according to an embodiment of the present disclosure.

[0311] Storage 1003 is a computer-readable recording medium, and may be, for example, at least one of an optical disk such as a Compact Disc ROM (CD-ROM), a hard disk drive, a flexible disk, a magneto-optical disk (e.g., a compact disk, a digital versatile disk, a Blu-ray disc), a smart card, a flash memory (e.g., a card, a stick, a key drive), a floppy disk, a magnetic strip, etc. Storage 1003 may also be referred to as an auxiliary storage device. The above-mentioned recording medium may be, for example, a database, a server, or other suitable medium including at least one of memory 1002 and storage 1003.

[0312] The communication device 1004 is hardware (transmission / reception device) for communicating between computers via at least one of a wired network and a wireless network, and is also called, for example, a network device, a network controller, a network card, or a communication module.

[0313] The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. to realize, for example, at least one of Frequency Division Duplex (FDD) and Time Division Duplex (TDD).

[0314] The input device 1005 is an input device (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that receives input from the outside. The output device 1006 is an output device (e.g., a display, a speaker, an LED lamp, etc.) that outputs to the outside. Note that the input device 1005 and the output device 1006 may be integrated into one device (e.g., a touch panel).

[0315] Furthermore, each device such as the processor 1001 and the memory 1002 is connected to a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using different buses between each device.

[0316] Furthermore, the device may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), or a field programmable gate array (FPGA), and some or all of the functional blocks may be realized by the hardware. For example, the processor 1001 may be implemented using at least one of these pieces of hardware.

[0317] Furthermore, the notification of information is not limited to the aspects / embodiments described in the present disclosure, and may be performed using other methods. For example, the notification of information may be performed by physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI)), higher layer signaling (e.g., RRC signaling, Medium Access Control (MAC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB))), other signals, or a combination thereof. Furthermore, the RRC signaling may be referred to as an RRC message, and may be, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, or the like.

[0318] Each aspect / embodiment described in the present disclosure may be applied to at least one of a system using Long Term Evolution (LTE), LTE-Advanced (LTE-A), SUPER 3G, IMT-Advanced, a 4th generation mobile communication system (4G), a 5th generation mobile communication system (5G), a 6th generation mobile communication system (6G), an xth generation mobile communication system (xG) (where x is, for example, an integer or a decimal), Future Radio Access (FRA), New Radio (NR), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), or other suitable system, and a next-generation system extended based on these. Furthermore, a combination of multiple systems (e.g., a combination of at least one of LTE and LTE-A with 5G) may also be applied.

[0319] The order of the procedures, sequences, flowcharts, etc. of each aspect / embodiment described in this disclosure may be changed unless it is consistent. For example, the methods described in this disclosure present elements of various steps using an example order, and are not limited to the particular order presented.

[0320] In the present disclosure, a specific operation described as being performed by a base station may, in some cases, be performed by its upper node. It is clear that in a network consisting of one or more network nodes having a base station, various operations performed for communication with a terminal may be performed by at least one of the base station and another network node other than the base station (such as, but not limited to, an MME or an S-GW). While the above example illustrates a case in which there is one other network node other than the base station, a combination of multiple other network nodes (such as an MME and an S-GW) may also be used.

[0321] Information, signals (information, etc.) may be output from a higher layer (or a lower layer) to a lower layer (or a higher layer), or may be input / output via multiple network nodes.

[0322] The input and output information may be stored in a specific location (for example, a memory) or may be managed using a management table. The input and output information may be overwritten, updated, or added. The output information may be deleted. The input information may be transmitted to another device.

[0323] The determination may be made based on a value represented by one bit (0 or 1), a Boolean value (true or false), or a numerical comparison (e.g., comparison with a predetermined value).

[0324] The aspects / embodiments described in this disclosure may be used alone, in combination, or switched depending on the implementation. Notification of predetermined information (e.g., notification that "X is true") is not limited to explicit notification, but may be implicit (e.g., not notifying the predetermined information).

[0325] Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

[0326] Software, instructions, information, etc. may also be transmitted or received over a transmission medium. For example, if software is transmitted from a website, server, or other remote source using wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), and / or wireless technologies (such as infrared, microwave), then these wired and / or wireless technologies are included within the definition of transmission media.

[0327] The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0328] Note that terms described in this disclosure and terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, at least one of a channel and a symbol may be a signal (signaling). Furthermore, a signal may be a message. Furthermore, a component carrier (CC) may be called a carrier frequency, a cell, a frequency carrier, etc.

[0329] As used in this disclosure, the terms "system" and "network" are used interchangeably.

[0330] Furthermore, the information, parameters, etc. described in the present disclosure may be expressed using absolute values, may be expressed using relative values ​​from a predetermined value, or may be expressed using other corresponding information. For example, a radio resource may be indicated by an index.

[0331] The names used for the above-described parameters are not intended to be limiting in any way. Furthermore, the mathematical expressions using these parameters may differ from those explicitly disclosed in this disclosure. The various channels (e.g., PUCCH, PDCCH, etc.) and information elements may be identified by any suitable names, and therefore the various names assigned to these various channels and information elements are not intended to be limiting in any way.

[0332] In this disclosure, terms such as "base station (BS)," "radio base station," "fixed station," "NodeB," "eNodeB (eNB)," "gNodeB (gNB)," "access point," "transmission point," "reception point," "transmission / reception point," "cell," "sector," "cell group," "carrier," and "component carrier" may be used interchangeably. Base stations may also be referred to by terms such as macrocell, small cell, femtocell, and picocell.

[0333] A base station can accommodate one or more (e.g., three) cells (also called sectors). When a base station accommodates multiple cells, the overall coverage area of ​​the base station can be divided into multiple smaller areas, and each smaller area can be provided with communication services by a base station subsystem (e.g., a small indoor base station (Remote Radio Head: RRH)).

[0334] The terms "cell" or "sector" refer to part or all of the coverage area of ​​a base station and / or base station subsystem that provides communication services within that coverage area.

[0335] In the present disclosure, the base station transmitting information to a terminal may be interpreted as the base station instructing the terminal to control or operate based on the information.

[0336] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," etc. may be used interchangeably.

[0337] A mobile station may also be referred to by those skilled in the art as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable terminology.

[0338] At least one of the base station and the mobile station may be referred to as a transmitting device, a receiving device, a communication device, etc. At least one of the base station and the mobile station may be a device mounted on a mobile object, the mobile object itself, etc. The mobile object may be a vehicle (e.g., a car, an airplane, etc.), an unmanned mobile object (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). At least one of the base station and the mobile station may also include devices that do not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

[0339] Furthermore, a base station in the present disclosure may be read as a mobile station (user terminal, the same applies hereinafter). For example, the aspects / embodiments of the present disclosure may be applied to a configuration in which communication between a base station and a mobile station is replaced with communication between multiple mobile stations (which may be called, for example, Device-to-Device (D2D) or Vehicle-to-Everything (V2X)). In this case, the mobile station may be configured to have the functions of a base station. Furthermore, terms such as "uplink" and "downlink" may be read as terms corresponding to terminal-to-terminal communication (for example, "side"). For example, terms such as an uplink channel and a downlink channel may be read as a side channel.

[0340] Similarly, a mobile station in the present disclosure may be interpreted as a base station, in which case the base station may have the functions of a mobile station.

[0341] A radio frame may be composed of one or more frames in the time domain, each of which may be called a subframe.

[0342] A subframe may further be composed of one or more slots in the time domain, and may have a fixed time length (e.g., 1 ms) that is independent of numerology.

[0343] Numerology may be a communication parameter applied to the transmission and / or reception of a signal or channel, and may indicate, for example, at least one of a subcarrier spacing (SCS), a bandwidth, a symbol length, a cyclic prefix length, a transmission time interval (TTI), a number of symbols per TTI, a radio frame structure, a particular filtering operation performed by a transceiver in the frequency domain, a particular windowing operation performed by a transceiver in the time domain, etc.

[0344] A slot may consist of one or more symbols in the time domain (such as Orthogonal Frequency Division Multiplexing (OFDM) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, etc.) A slot may be a numerology-based time unit.

[0345] A slot may include multiple minislots. Each minislot may consist of one or multiple symbols in the time domain. A minislot may also be called a subslot. A minislot may consist of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a minislot may be called PDSCH (or PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a minislot may be called PDSCH (or PUSCH) mapping type B.

[0346] The radio frame, subframe, slot, minislot, and symbol all represent time units for transmitting signals, and may be referred to by other names corresponding to the radio frame, subframe, slot, minislot, and symbol.

[0347] For example, one subframe may be referred to as a transmission time interval (TTI), multiple consecutive subframes may be referred to as a TTI, or one slot or one minislot may be referred to as a TTI. That is, at least one of the subframe and the TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (e.g., 1-13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, minislot, etc., instead of a subframe.

[0348] Here, TTI refers to, for example, the smallest time unit for scheduling in wireless communication. For example, in an LTE system, a base station schedules each user terminal to allocate radio resources (such as frequency bandwidth and transmission power that can be used by each user terminal) in TTI units. Note that the definition of TTI is not limited to this.

[0349] The TTI may be a transmission time unit for a channel-encoded data packet (transport block), a code block, a code word, etc., or may be a processing unit for scheduling, link adaptation, etc. When a TTI is given, the time interval (e.g., the number of symbols) to which a transport block, a code block, a code word, etc. is actually mapped may be shorter than the TTI.

[0350] When one slot or one minislot is called a TTI, one or more TTIs (i.e., one or more slots or one or more minislots) may be the minimum time unit for scheduling. Also, the number of slots (minislots) constituting the minimum time unit for scheduling may be controlled.

[0351] A TTI having a time length of 1 ms may be called a regular TTI (TTI in LTE Rel. 8-12), normal TTI, long TTI, regular subframe, normal subframe, long subframe, slot, etc. A TTI shorter than a regular TTI may be called a shortened TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, minislot, subslot, slot, etc.

[0352] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length of more than 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be interpreted as a TTI having a TTI length shorter than the TTI length of a long TTI and equal to or greater than 1 ms.

[0353] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may include one or more consecutive subcarriers in the frequency domain. The number of subcarriers included in an RB may be the same regardless of numerology, for example, 12. The number of subcarriers included in an RB may also be determined based on numerology.

[0354] The time domain of an RB may include one or more symbols and may have a length of one slot, one minislot, one subframe, or one TTI. One TTI, one subframe, etc. may each be composed of one or more resource blocks.

[0355] Note that one or more RBs may also be called a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, etc.

[0356] Furthermore, a resource block may be composed of one or more resource elements (REs). For example, one RE may be a radio resource region of one subcarrier and one symbol.

[0357] A Bandwidth Part (BWP) (which may also be referred to as a fractional bandwidth) may represent a subset of contiguous common resource blocks (RBs) for a given numerology on a given carrier, where the common RBs may be identified by their index relative to a common reference point of the carrier. PRBs may be defined in a given BWP and numbered within that BWP.

[0358] The BWP may include a BWP for UL (UL BWP) and a BWP for DL ​​(DL BWP). One or more BWPs may be configured for a UE within one carrier.

[0359] At least one of the configured BWPs may be active, and the UE may not expect to transmit or receive a given signal / channel outside the active BWP. Note that the terms "cell," "carrier," etc. in this disclosure may be read as "BWP."

[0360] The above-described structures of radio frames, subframes, slots, minislots, symbols, etc. are merely examples. For example, the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the cyclic prefix (CP) length, etc. may be variously changed.

[0361] The terms "connected," "coupled," or any variation thereof, refer to any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, "connected" may be read as "access." As used in this disclosure, two elements may be considered to be "connected" or "coupled" to each other using one or more wires, cables, and / or printed electrical connections, as well as electromagnetic energy having wavelengths in the radio frequency range, microwave range, and optical (both visible and invisible) range, as some non-limiting and non-exhaustive examples.

[0362] The reference signal may also be abbreviated as Reference Signal (RS) and may be called a pilot depending on the applicable standard.

[0363] As used in this disclosure, the phrase "based on" does not mean "based only on," unless expressly stated otherwise. In other words, the phrase "based on" means both "based only on" and "based at least on."

[0364] The "means" in the configuration of each of the above devices may be replaced with "part," "circuit," "device," etc.

[0365] As used in this disclosure, any reference to an element using a designation such as "first," "second," etc. does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, a reference to a first and a second element does not imply that only two elements may be employed therein or that the first element must precede the second element in some way.

[0366] When the terms "include," "including," and variations thereof are used in this disclosure, these terms are intended to be inclusive, similar to the term "comprising." Furthermore, when the term "or" is used in this disclosure, it is not intended to be an exclusive or.

[0367] In this disclosure, where articles are added by translation, such as a, an, and the in English, the disclosure may include that the nouns following these articles are in the plural form.

[0368] As used in this disclosure, the terms "determining" and "determining" may encompass a wide variety of actions. "Determining" and "determining" may include, for example, judging, calculating, computing, processing, deriving, investigating, looking up, searching, inquiring (e.g., searching in a table, database, or other data structure), ascertaining, and the like. "Determining" and "determining" may also include receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in memory), and the like. Furthermore, "judgment" and "decision" can include regarding resolving, selecting, choosing, establishing, comparing, etc. as having been "judged" or "decided." In other words, "judgment" and "decision" can include regarding some action as having been "judged" or "decided." Furthermore, "judgment (decision)" can be interpreted as "assuming," "expecting," "considering," etc.

[0369] In the present disclosure, the term "A and B are different" may mean "A and B are different from each other." The term may also mean "A and B are each different from C." Terms such as "separate" and "coupled" may also be interpreted in the same way as "different."

[0370] 24 shows an example of the configuration of a vehicle 2001. As shown in Fig. 24, the vehicle 2001 includes a drive unit 2002, a steering unit 2003, an accelerator pedal 2004, a brake pedal 2005, a shift lever 2006, left and right front wheels 2007, left and right rear wheels 2008, an axle 2009, an electronic control unit 2010, various sensors 2021 to 2029, an information service unit 2012, and a communication module 2013.

[0371] The drive unit 2002 is composed of, for example, an engine, a motor, or a hybrid of an engine and a motor.

[0372] The steering unit 2003 includes at least a steering wheel (also called a handle) and is configured to steer at least one of the front wheels and the rear wheels based on the operation of the steering wheel operated by the user.

[0373] The electronic control unit 2010 is composed of a microprocessor 2031, a memory (ROM, RAM) 2032, and a communication port (IO port) 2033. Signals are input to the electronic control unit 2010 from various sensors 2021 to 2027 provided in the vehicle. The electronic control unit 2010 may also be called an ECU (Electronic Control Unit).

[0374] The signals from the various sensors 2021 to 2028 include a current signal from a current sensor 2021 that senses the current of the motor, a rotation speed signal of the front and rear wheels obtained by a rotation speed sensor 2022, an air pressure signal of the front and rear wheels obtained by an air pressure sensor 2023, a vehicle speed signal obtained by a vehicle speed sensor 2024, an acceleration signal obtained by an acceleration sensor 2025, an accelerator pedal depression amount signal obtained by an accelerator pedal sensor 2029, a brake pedal depression amount signal obtained by a brake pedal sensor 2026, a shift lever operation signal obtained by a shift lever sensor 2027, and a detection signal for detecting obstacles, vehicles, pedestrians, etc. obtained by an object detection sensor 2028.

[0375] The information service unit 2012 is composed of various devices, such as a car navigation system, an audio system, speakers, a television, and a radio, for providing various types of information such as driving information, traffic information, and entertainment information, and one or more ECUs for controlling these devices. The information service unit 2012 uses information obtained from external devices via the communication module 2013, etc., to provide various types of multimedia information and multimedia services to the occupants of the vehicle 1.

[0376] The driving assistance system unit 2030 is composed of various devices that provide functions for preventing accidents and reducing the driver's driving burden, such as millimeter-wave radar, LiDAR (Light Detection and Ranging), cameras, positioning locators (e.g., GNSS, etc.), map information (e.g., high-definition (HD) maps, autonomous vehicle (AV) maps, etc.), gyro systems (e.g., IMU (Inertial Measurement Unit), INS (Inertial Navigation System), etc.), AI (Artificial Intelligence) chips, and AI processors, as well as one or more ECUs that control these devices. The driving assistance system unit 2030 also transmits and receives various information via the communication module 2013 to realize driving assistance functions or autonomous driving functions.

[0377] The communication module 2013 can communicate with the microprocessor 2031 and components of the vehicle 1 via the communication port. For example, the communication module 2013 transmits and receives data via the communication port 2033 to and from a driving unit 2002, a steering unit 2003, an accelerator pedal 2004, a brake pedal 2005, a shift lever 2006, left and right front wheels 2007, left and right rear wheels 2008, an axle 2009, a microprocessor 2031 and memory (ROM, RAM) 2032 in the electronic control unit 2010, and sensors 2021 to 2028, which are provided in the vehicle 2001.

[0378] The communication module 2013 is a communication device that can be controlled by the microprocessor 2031 of the electronic control unit 2010 and can communicate with an external device. For example, it transmits and receives various information to and from the external device via wireless communication. The communication module 2013 may be located either inside or outside the electronic control unit 2010. The external device may be, for example, a base station, a mobile station, or the like.

[0379] The communication module 2013 transmits, via wireless communication to an external device, a current signal from the current sensor that is input to the electronic control unit 2010. The communication module 2013 also transmits, via wireless communication to an external device, the rotation speed signals of the front and rear wheels acquired by a rotation speed sensor 2022, the air pressure signals of the front and rear wheels acquired by an air pressure sensor 2023, the vehicle speed signal acquired by a vehicle speed sensor 2024, the acceleration signal acquired by an acceleration sensor 2025, the accelerator pedal depression amount signal acquired by an accelerator pedal sensor 2029, the brake pedal depression amount signal acquired by a brake pedal sensor 2026, the shift lever operation signal acquired by a shift lever sensor 2027, and the detection signals for detecting obstacles, vehicles, pedestrians, etc. acquired by an object detection sensor 2028, all of which are input to the electronic control unit 2010.

[0380] The communication module 2013 receives various information (traffic information, traffic signal information, vehicle distance information, etc.) transmitted from external devices and displays it on an information service unit 2012 provided in the vehicle. The communication module 2013 also stores the various information received from the external devices in a memory 2032 that can be used by the microprocessor 2031. Based on the information stored in the memory 2032, the microprocessor 2031 may control the drive unit 2002, steering unit 2003, accelerator pedal 2004, brake pedal 2005, shift lever 2006, left and right front wheels 2007, left and right rear wheels 2008, axle 2009, sensors 2021 to 2028, and the like provided in the vehicle 2001.

[0381] Although the present disclosure has been described in detail above, it is clear to those skilled in the art that the present disclosure is not limited to the embodiments described herein. The present disclosure can be implemented in modified and altered forms without departing from the spirit and scope of the present disclosure as defined by the claims. Therefore, the description of the present disclosure is intended to be illustrative and does not have any limiting meaning on the present disclosure.

[0382] (Supplementary Note 1) The above disclosure may be expressed as follows:

[0383] A first feature is a terminal including: a receiving unit that receives first information that identifies a target cell as a specific cell belonging to a non-terrestrial network and second information that identifies that the target cell supports sidelink communication; and a control unit that executes specific control regarding the sidelink communication based on the first information and the second information.

[0384] A second feature is that, in the first feature, the terminal includes a transmitting unit that transmits at least one of information indicating whether to perform the sidelink communication based on the second information and information indicating whether an operation related to simultaneous execution of the sidelink communication and the communication between the specific cell and the terminal is possible.

[0385] A third feature is the terminal according to the first feature or the second feature, wherein the receiving unit receives information indicating whether the terminal performing the sidelink communication based on the second information is connectable to the specific cell.

[0386] A fourth feature is a base station including: a transmitter that transmits first information that identifies a target cell as a specific cell belonging to a non-terrestrial network and second information that identifies that the target cell supports the sidelink communication; and a controller that assumes that a terminal executes specific control regarding the sidelink communication based on the first information and the second information.

[0387] A fifth feature is a wireless communication system including a terminal and a base station, wherein the terminal includes a receiver that receives first information that identifies a target cell as a specific cell belonging to a non-terrestrial network and second information that identifies that the target cell supports the sidelink communication, and a controller that executes specific control regarding the sidelink communication based on the first information and the second information.

[0388] A sixth feature is a wireless communication method including: a step A of receiving first information identifying a target cell as a specific cell belonging to a non-terrestrial network; a step B of receiving second information identifying that the target cell supports the sidelink communication; and a step C of executing specific control regarding the sidelink communication based on the first information and the second information.

[0389] (Supplementary Note 2) The above disclosure may be expressed as follows:

[0390] A first feature of the terminal is that it includes: a receiving unit that receives information indicating resources for sidelink communication in a specific cell belonging to a non-terrestrial network; and a control unit that performs specific control regarding the sidelink communication when the resources for the sidelink communication are allocated by the specific cell.

[0391] A second feature is that, in the terminal of the first feature, the controller performs, as the specific control, control to determine timing for transmitting feedback regarding the sidelink communication to the specific cell based on a specific parameter in the specific cell.

[0392] A third feature is the terminal according to the first or second feature, wherein the control unit executes, as the specific control, control to report a timing advance to be applied to an uplink signal for the specific cell.

[0393] A fourth feature is a base station including: a transmitter that transmits information indicating resources for sidelink communication in a specific cell that belongs to a non-terrestrial network; and a controller that assumes that a terminal executes specific control regarding the sidelink communication when the resources for the sidelink communication are allocated by the specific cell.

[0394] A fifth feature is a wireless communication system including a terminal and a base station, wherein the terminal includes a receiving unit that receives information indicating resources for sidelink communication in a specific cell belonging to a non-terrestrial network, and a control unit that performs specific control regarding the sidelink communication when the resources for the sidelink communication are allocated by the specific cell.

[0395] A sixth feature is a wireless communication method comprising: a step A of receiving information indicating resources for sidelink communication in a specific cell belonging to a non-terrestrial network; and a step B of performing specific control regarding the sidelink communication when the resources for the sidelink communication are allocated by the specific cell.

[0396] (Appendix 3) The above disclosure may be expressed as follows:

[0397] A first feature is a terminal including: a communication unit that transmits an uplink signal to a specific cell belonging to a non-terrestrial network and performs sidelink communication; and a control unit that, when autonomously selecting resources for the sidelink communication, performs specific control regarding the transmission of the uplink signal and the sidelink communication.

[0398] A second feature is the terminal of the first feature, wherein the controller performs, as the specific control, control to exclude resources for the sidelink communication that overlap in time with resources for the uplink signal from candidate resources for the sidelink communication.

[0399] A third feature is the terminal according to the first or second feature, wherein the control unit executes control to report information related to the sidelink communication as the specific control.

[0400] A fourth feature is a base station including: a receiving unit that receives an uplink signal for a specific cell belonging to a non-terrestrial network; and a control unit that assumes that, when a terminal autonomously selects resources for sidelink communication, the terminal performs specific control regarding transmission of the uplink signal and the sidelink communication.

[0401] A fifth feature is a wireless communication system including a terminal and a base station, wherein the terminal includes a communication unit that transmits an uplink signal to a specific cell belonging to a non-terrestrial network and performs sidelink communication, and a control unit that, when autonomously selecting resources for the sidelink communication, performs specific control regarding the transmission of the uplink signal and the sidelink communication.

[0402] A sixth feature is a wireless communication method including: step A of transmitting an uplink signal to a specific cell belonging to a non-terrestrial network; step B of performing sidelink communication; and step C of performing specific control regarding the transmission of the uplink signal and the sidelink communication when autonomously selecting resources for the sidelink communication.

[0403] 10 Wireless communication system 20 NG-RAN 30 Core network 100 gNB 100X NTN gateway 110 Receiving unit 120 Transmitting unit 130 Control unit 150 Satellite 200 UE 210 Wireless signal transmitting / receiving unit 220 Amplifier unit 230 Modulation / demodulation unit 240 Control signal / reference signal processing unit 250 Encoding / decoding unit 260 Data transmitting / receiving unit 270 Control unit 300 LMF 1001 Processor 1002 Memory 1003 Storage 1004 Communication device 1005 Input device 1006 Output device 1007 Bus 2001 Vehicle 2002 Drive unit 2003 Steering unit 2004 Accelerator pedal 2005 Brake pedal 2006 Shift lever 2007 Left and right front wheels 2008 Left and right rear wheels 2009 Axle 2010 Electronic control unit 2012 Information service unit 2013 Communication module 2021 Current sensor 2022 RPM sensor 2023 Air pressure sensor 2024 Vehicle speed sensor 2025 Acceleration sensor 2026 Brake pedal sensor 2027 Shift lever sensor 2028 Object detection sensor 2029 Accelerator pedal sensor 2030 Driving assistance system unit 2031 Microprocessor 2032 Memory (ROM, RAM) 2033 Communication port

Claims

1. A terminal comprising: a receiving unit that receives information indicating resources for sidelink communication in a specific cell belonging to a non-terrestrial network; and a control unit that performs specific control regarding the sidelink communication when resources for the sidelink communication are allocated by the specific cell.

2. The terminal according to claim 1, wherein the control unit executes, as the specific control, control to determine a timing for transmitting feedback regarding the sidelink communication to the specific cell based on a specific parameter in the specific cell.

3. The terminal according to claim 1, wherein the control unit executes, as the specific control, control of reporting a timing advance to be applied to an uplink signal for the specific cell.

4. A base station comprising: a transmitter that transmits information indicating resources for sidelink communication in a specific cell belonging to a non-terrestrial network; and a control unit that assumes that a terminal executes specific control regarding the sidelink communication when the resources for the sidelink communication are allocated by the specific cell.

5. A wireless communication system comprising a terminal and a base station, wherein the terminal comprises: a receiving unit that receives information indicating resources for sidelink communication in a specific cell belonging to a non-terrestrial network; and a control unit that performs specific control regarding the sidelink communication when resources for the sidelink communication are allocated by the specific cell.

6. A wireless communication method comprising: a step A of receiving information indicating resources for sidelink communication in a specific cell belonging to a non-terrestrial network; and a step B of performing specific control regarding the sidelink communication when the resources for the sidelink communication are allocated by the specific cell.