Wireless communication node and wireless communication method

Abstract

This wireless communication node transmits a plurality of synchronization signals having different configurations, and sets at least one of the plurality of synchronization signals on the basis of the function or connection state of the wireless communication node.

Description

Technical Field

[0001] The present disclosure relates to a wireless communication node and a wireless communication method corresponding to a flexible network and a mesh network.

Background Art

[0002] The 3rd Generation Partnership Project (3GPP) has standardized the 5th generation mobile communication system (also called 5G, New Radio (NR) or Next Generation (NG)), and is also promoting the standardization of the next generation called Beyond 5G, 5G Evolution or 6G.

[0003] In 6G, various use cases such as higher required performance, ultra-coverage extension / ultra-long-distance communication, ultra-large capacity, ultra-reliable communication, virtual cell (User centric no cell), flexible network, and mesh network / sidelink are assumed (Non-Patent Document 1).

[0004] Regarding the initial access of a wireless communication node (which may include a terminal (User Equipment, UE), a wireless base station (such as a gNB, which may have another name), and a communication device constituting Integrated Access and Backhaul (IAB)), a design considering such 6G characteristics is inevitable.

Prior Art Documents

Non-Patent Documents

[0005]

Non-Patent Document 1

Summary of the Invention

[0006] In flexible networks and mesh networks, for example, flexible placement of network functions is assumed in conjunction with various network topologies.

[0007] Therefore, a wireless communication node such as a terminal needs to quickly and surely establish synchronization with various entities (which may be read as wireless communication nodes) having different functions to be provided.

[0008] Therefore, the following disclosure has been made in view of such a situation, and an object thereof is to provide a wireless communication node and a wireless communication method capable of quickly and surely establishing synchronization with various entities having different functions to be provided.

[0009] One aspect of the present disclosure is a wireless communication node (NW node 100) including a transmission unit (control signal / reference signal processing unit 140) that transmits a plurality of synchronization signals having different configurations, and a control unit (control unit 170) that sets at least any one of the plurality of synchronization signals based on the function or connection state of the wireless communication node.

[0010] One aspect of the present disclosure is a wireless communication node (NW node 100) including a transmission / reception unit (wireless signal transmission / reception unit 110) that transmits and receives wireless signals, and a control unit (control unit 170) that sets the transmission timing and reception timing of the wireless signals, wherein the control unit assumes that the reception timings of all the wireless signals in the wireless communication node coincide, and sets the transmission timing according to the reception timing.

[0011] One aspect of the present disclosure is a wireless communication method including: transmitting a plurality of synchronization signals having different configurations; and setting at least any one of the plurality of synchronization signals based on the function or connection state of a wireless communication node.

[0012] One aspect of the present disclosure is a wireless communication method including: transmitting and receiving a wireless signal; and setting a transmission timing and a reception timing of the wireless signal, wherein in the setting step, it is assumed that reception timings of all the wireless signals in a wireless communication node coincide with each other, and the transmission timing is set according to the reception timing.

Brief Description of the Drawings

[0013]

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Embodiments for Carrying Out the Invention

[0014] Hereinafter, embodiments will be described with reference to the drawings. Note that the same or similar reference numerals are given to the same functions and configurations, and the description thereof will be omitted as appropriate.

[0015] (1) Overall Schematic Configuration of the Wireless Communication System FIG. 1 is an overall schematic configuration diagram of a wireless communication system 10 according to the present embodiment. In the present embodiment, the wireless communication system 10 is a wireless communication system according to a method called Beyond 5G, 5G Evolution, or 6G, which is a successor to 5G New Radio (NR).

[0016] As shown in FIG. 1, the wireless communication system 10 may be configured by a plurality of wireless communication nodes. Specifically, the wireless communication system 10 may be configured by a plurality of network nodes 100 (hereinafter, NW Node 100) and terminals 200 (user equipment (User Equipment) 200, hereinafter, UE 200). Note that the wireless communication system 10 may include a core network (not shown) connected to an external network or the like, and a part (or all) of the radio access network configured by the core network and / or the wireless communication nodes may be simply expressed as a "network".

[0017] The NW node 100 and the UE 200 are a type of wireless communication nodes capable of performing wireless communication. Note that both the NW node 100 and the UE 200 are wireless communication nodes and do not necessarily need to be clearly distinguished. That is, the NW node 100 and the UE 200 may function as network nodes or UEs (or both) according to the type of communication, the application being executed, the communication state, the location, etc.

[0018] In addition to the NW node and the user device, the wireless communication node may be called by another name meaning a device that performs wireless communication (mobile communication), such as a node, a network entity, a network device, a communication device, etc.

[0019] Also, the functions of such wireless communication nodes may be provided while being mounted on various mobile bodies. For example, as shown in FIG. 1, the wireless communication node may be mounted on an aircraft 40, a drone 50, a vehicle 60, etc.

[0020] The aircraft 40 is a vehicle that carries people or objects and flies in the air, and may include a balloon, a flying ship, a glider, an airplane, a helicopter, etc. The flyable altitude of the aircraft 40 is not particularly limited, but an altitude up to 10,000 m may be assumed.

[0021] The drone 50 flies in the air in the same way as the aircraft 40, but in particular, it may be interpreted as an aircraft that flies unmanned by remote control or automatic control. However, the drone 50 does not necessarily have to be unmanned, nor does it have to be remote-controlled or automatically controlled. Also, generally, the flyable altitude of the drone 50 may be lower than that of the aircraft 40. The drone 50 may be called Unmanned Aerial Vehicles (UAV), etc.

[0022] The vehicle 60 may be interpreted as a vehicle that runs on land by power, such as an automobile. The vehicle 60 may include vehicles that run on a track, such as a train. Note that the wireless communication node is not limited to land and may be mounted on a ship at sea.

[0023] In addition, the wireless communication node may be mounted on a geostationary orbit (GEO) satellite, a low earth orbit (LEO) satellite, a high-altitude platform station (HAPS), or the like. Note that the HAPS can stay at a fixed location at an altitude of about 20 km and may form a coverage area with a large cell radius (e.g., 50 km or more) on land.

[0024] In this way, the wireless communication system 10 can support coverage expansion including a non-terrestrial network.

[0025] In addition, the wireless communication node may function as a wireless relay device intervening between other wireless communication nodes. The wireless relay device may be called a relay or a repeater, etc., and may be a component of an Integrated Access and Backhaul (IAB) that integrates wireless access to a terminal (User Equipment, UE) and a wireless backhaul between wireless communication nodes such as a wireless base station (e.g., gNB).

[0026] The wireless communication system 10 may support the same frequency band as NR and may use the same bandwidth (BW) and subcarrier spacing (SCS). Furthermore, the wireless communication system 10 may support an even higher frequency band. Specifically, the wireless communication system 10 may support a high frequency band such as millimeter waves exceeding 10 GHz. Also, a bandwidth of about several hundreds of MHz may be applied.

[0027] In addition, similar to NR, the wireless communication system 10 may support functions related to eMBB (enhanced Mobile Broadband), URLLC (Ultra-Reliable and Low Latency Communications), and mMTC (massive Machine Type Communication). Also, similar to NR, Cyclic Prefix-Orthogonal Frequency Division Multiplexing (CP-OFDM) / Discrete Fourier Transform - Spread (DFT-S-OFDM) with a larger Sub-Carrier Spacing (SCS) may be applied.

[0028] Furthermore, in order to achieve ultra-high-speed and high-capacity communication, an FTN (Faster-than-Nyquist) signal that non-orthogonally compresses and transmits a signal using a sampling rate larger than the frequency bandwidth in the time domain may be used.

[0029] Note that the time domain may also be referred to as the time direction, time component, time domain, symbol period, or symbol time. Also, the symbol period may also be referred to as the symbol length, time direction, or time domain. The frequency domain may also be referred to as the frequency direction, frequency component, frequency domain, resource block, resource block group, sub-carrier, BWP (Bandwidth part), sub-channel, common frequency resource, etc.

[0030] In addition, similar to NR, the wireless communication system 10 may also support Massive MIMO (mMIMO) that generates a more directional beam by controlling wireless signals transmitted from a plurality of antenna elements, carrier aggregation (CA) that bundles and uses a plurality of component carriers (CC), and dual connectivity (DC) that enables simultaneous communication between a UE and a plurality of wireless communication nodes.

[0031] As shown in FIG. 1, in the wireless communication system 10, a mesh-type network (mesh network) may be formed in which each wireless communication node is connected to a plurality of wireless communication nodes simultaneously and can form various connection paths (communication paths).

[0032] Also, as described above, the functions (which may also be roles) and types provided by each wireless communication node may be flexibly changed according to the situation and the like, and a flexible network function arrangement may be realized in combination with various network topologies. Such a network may be called a flexible network.

[0033] For example, in the radio access technology (RAT) adopted in the wireless communication system 10, it may be possible to enhance the distributed network in the spatial domain, that is, communicate at a distance as close as possible and in a line-of-sight environment (a path with less loss), and create as many communication paths as possible to increase the room for path selection (increase redundancy).

[0034] To realize such a flexible network or mesh network, distributed antenna deployment in which a large number of antenna devices are distributed and deployed, the arrangement of a reflecting plate (RIS: Reconfigurable Intelligent Surface) for the purpose of improving wireless performance, cooperative transmission and reception technology between terminals (wireless communication nodes), etc. may be applied.

[0035] (2) Functional Block Configuration of Wireless Communication System Next, the functional block configuration of the wireless communication system 10 will be described. Specifically, the functional block configuration of the NW node 100 will be described. FIG. 2 is a functional block configuration diagram of the NW node 100 and the UE 200.

[0036] As shown in FIG. 2, the NW node 100 includes a wireless signal transceiver unit 110, an amplifier unit 120, a modulation / demodulation unit 130, a control signal / reference signal processing unit 140, an encoding / decoding unit 150, a data transceiver unit 160, and a control unit 170.

[0037] Note that in FIG. 2, only the main functional blocks related to the description of the embodiment are shown, and it should be noted that the NW node 100 (UE200) has other functional blocks (for example, a power supply unit, etc.). Also, FIG. 3 shows the functional block configuration of the NW node 100. For the hardware configuration, refer to FIG. 12.

[0038] The wireless signal transceiver unit 110 transmits and receives wireless signals according to the 6G RAT. In this embodiment, the wireless signal transceiver unit 110 may constitute a transceiver unit.

[0039] The wireless signal transceiver unit 110 may support Massive MIMO that generates a more directional beam by controlling the wireless (RF) signals transmitted from a plurality of antenna elements, carrier aggregation (CA) that bundles and uses a plurality of component carriers (CC), and dual connectivity (DC) that enables simultaneous communication between two NW nodes 100 (or UE200).

[0040] The amplifier unit 120 is composed of a PA (Power Amplifier) / LNA (Low Noise Amplifier), etc. The amplifier unit 120 amplifies the signal output from the modulation / demodulation unit 130 to a predetermined power level. Also, the amplifier unit 120 amplifies the RF signal output from the wireless signal transceiver unit 110.

[0041] The modulation / demodulation unit 130 performs data modulation / demodulation, transmission power setting, resource block allocation, etc. for each specific communication destination (UE200).

[0042] The control signal / reference signal processing unit 140 executes processing related to various control signals transmitted and received by the NW node 100. Specifically, the control signal / reference signal processing unit 140 receives various control signals transmitted from the UE200 via a control channel, for example, control signals of the radio resource control layer (RRC). Also, the control signal / reference signal processing unit 140 transmits various control signals to the UE200 via a control channel.

[0043] The control signal may include downlink control information (DCI) and uplink control information (UCI).

[0044] DCI may be interpreted as control information transmitted on the downlink (DL) that includes at least one of scheduling information necessary for each UE200 (or NW node 100) to demodulate data, data modulation, and information on the channel coding rate.

[0045] UCI may be interpreted as control information transmitted on the uplink (UL) that includes at least one of ACK / NACK of hybrid automatic repeat request (HARQ), a scheduling request (SR) from UE200 (or NW node 100), and channel state information (CSI).

[0046] Furthermore, the control signal / reference signal processing unit 140 can execute processing using reference signals (RS) such as a demodulation reference signal and a phase tracking reference signal (PTRS).

[0047] DMRS is a reference signal (pilot signal) known between the base station for each terminal and the terminal for estimating the fading channel used for data demodulation. PTRS is a reference signal for each terminal for the purpose of estimating phase noise that is a problem in a high frequency band.

[0048] Note that the reference signal may include, in addition to DMRS and PTRS, a channel state information-reference signal (CSI-RS), a sounding reference signal (SRS), a positioning reference signal (PRS) for position information, and the like.

[0049] The channels include a control channel and a data channel. The control channel includes a PDCCH (Physical Downlink Control Channel), a PUCCH (Physical Uplink Control Channel), a PRACH (Physical Random Access Channel), a PBCH (Physical Broadcast Channel), and the like.

[0050] The data channel includes a PDSCH (Physical Downlink Shared Channel), a PUSCH (Physical Uplink Shared Channel), and the like. The signal may include a channel and a reference signal.

[0051] Note that the names of the reference signal and the channel are in accordance with NR, but they may be called by other names with the same meaning, and the names of the layers described later may also be called by other names with the same meaning.

[0052] Further, the control signal may include a synchronization signal used for establishing synchronization between wireless communication nodes. The control signal / reference signal processing unit 140 can transmit a plurality of synchronization signals having different configurations. In the present embodiment, the control signal / reference signal processing unit 140 may constitute a transmission unit.

[0053] In the wireless communication system 10, a plurality of types of synchronization signals, that is, synchronization signals having different configurations (which may be types), may be used according to the functions, roles, operating states, positions, usage environments, etc. of the wireless communication nodes. Alternatively, the synchronization signals may be the same regardless of the functions of the wireless communication nodes. Also, whether to use a plurality of synchronization signals separately or use one synchronization signal may be instructed by the network. Note that examples of the configuration of the synchronization signal will be described later.

[0054] In addition, the control signal / reference signal processing unit 140 can receive synchronization signal information regarding such a plurality of types of synchronization signals. In the present embodiment, the control signal / reference signal processing unit 140 may constitute a receiving unit.

[0055] Specifically, the control signal / reference signal processing unit 140 may receive information necessary to establish synchronization with the radio communication node equivalent to the radio base station (gNB) or another radio communication node from the radio communication node. The information may include, for example, the time and / or frequency domain to which the synchronization signal is allocated, the signal sequence (such as the number of bits), the modulation method, the coding rule, and the like.

[0056] The encoding / decoding unit 150 performs data splitting / concatenation and channel coding / decoding for each specific communication destination (UE200).

[0057] Specifically, the encoding / decoding unit 150 splits the data output from the data transmission / reception unit 160 into a predetermined size and performs channel coding on the split data. In addition, the encoding / decoding unit 150 decodes the data output from the modulation / demodulation unit 130 and concatenates the decoded data.

[0058] The data transmission / reception unit 160 performs the transmission and reception of Protocol Data Unit (PDU) and Service Data Unit (SDU). Specifically, the data transmission / reception unit 160 performs the assembly / disassembly of PDU / SDU in a plurality of layers (such as the Medium Access Control layer (MAC), the Radio Link Control layer (RLC), and the Packet Data Convergence Protocol layer (PDCP)).

[0059] The control unit 170 controls each functional block constituting the NW node 100. In particular, in the present embodiment, the control unit 170 executes control regarding the synchronization of the NW node 100.

[0060] Specifically, the control unit 170 can execute control necessary for the NW node 100 to establish synchronization with other wireless communication nodes. Establishing synchronization may mean entering a state where communication can be executed with a wireless communication node at the connection destination (communication destination) via a specific control channel or data channel. In other words, it may also be interpreted as a state where control data or user data can be transmitted or received in a specific time domain and / or frequency domain.

[0061] As described above, in the wireless communication system 10, a plurality of synchronization signals are used. However, the control unit 170 may set at least one of the plurality of synchronization signals based on the function or connection state of the wireless communication node. Here, the function of the wireless communication node may be the function (which may include the role) of its own node, or the function of the wireless communication node at the connection destination (which may not yet be connected). Also, the connection state may mean the availability of connection with a wireless communication node equivalent to a radio base station (gNB), the number of wireless communication nodes to be the connection destination, the configuration of the communication path, the speed (delay), and the like.

[0062] In view of the fact that a flexible network and / or a mesh network are configured in the wireless communication system 10, the control unit 170 may make the transmission timing of the synchronization signal different from the transmission timing of the synchronization signal in other wireless communication nodes. That is, the control unit 170 may apply an individual transmission timing of the synchronization signal for each wireless communication node.

[0063] The control unit 170 may set at least one of the plurality of synchronization signals based on the synchronization signal information received via the control signal / reference signal processing unit 140, and determine the transmission timing of the synchronization signal from its own node. As described above, the synchronization signal information transmitted from a wireless communication node equivalent to a radio base station (gNB) or the like includes information necessary for setting the synchronization signal. The control unit 170 may set the synchronization signal based on information such as the time domain and / or frequency domain included in the synchronization signal information, and transmit the set synchronization signal at a predetermined transmission timing.

[0064] In addition, the control unit 170 can set not only the synchronization signal but also the transmission timing and reception timing of a radio signal in which control data or user data is encoded and modulated. That is, the control unit 170 may set the transmission timing of the radio signal from its own node and the reception timing of the radio signal from other nodes.

[0065] Specifically, the control unit 170 may assume that all radio communication nodes in the radio communication system 10 align (match) the transmission timing. In this case, the reception timing may be determined according to the transmission timing (it may be timing according to the propagation delay difference between nodes).

[0066] Alternatively, the control unit 170 may assume that all radio communication nodes in the radio communication system 10 align (match) the reception timing. In this case, the transmission timing may be determined according to the reception timing.

[0067] In addition, the control unit 170 assumes that the reception timing of all radio signals (which may be read as radio links, channels, etc.) in a radio communication node (its own node or another radio communication node serving as a synchronization establishment reference) matches, and may set the transmission timing according to the reception timing. Note that the method for determining the transmission and reception timing of radio signals (radio links, channels) will be further described later.

[0068] In addition, the function related to the synchronization of the NW node 100 described above may also be provided in the UE 200.

[0069] (3) Operation of the radio communication system Next, the operation of the radio communication system 10 will be described. Specifically, an operation example related to synchronization among radio communication nodes in the radio communication system 10 will be described.

[0070] (3.1) Operation overview The following describes an operation example that enables synchronization between nodes when one terminal (UE200) is connected to a plurality of wireless communication nodes with different functions (hereinafter, appropriately abbreviated as nodes) in a flexible network or a mesh network.

[0071] Specifically, the following operation example will be described.

[0072] ·(Operation Example 1): Method for Establishing Synchronization between Nodes The wireless communication node may operate according to any of the following methods.

[0073] ·(i) Use a synchronization signal.

[0074] ·(ii) A wireless communication node equivalent to a radio base station (gNB) (hereinafter, appropriately denoted as gNB) notifies other wireless communication nodes (which may include UE200) of information regarding synchronization between nodes (when each node has means for directly or indirectly communicating with a wireless communication node equivalent to an NB).

[0075] ·(iii) Use a synchronization source implemented in the node, such as a satellite positioning system (GNSS).

[0076] ·(iv) A combination of (i) to (iii) above.

[0077] ·(Operation Example 2): Method for Determining Transmission / Reception Timing of Wireless Signals (Wireless Links) at Each Node The wireless communication node may operate according to any of the following methods.

[0078] ·(i) All nodes align the transmission timing (which may be aligned by the same method as the synchronization signal). For reception, it depends on the transmission timing (the timing will be according to the propagation delay difference between nodes).

[0079] ·(ii) For transmission, it depends on the reception timing. For reception, all nodes align the reception timing, or each node aligns the reception timing.

[0080] ·(iii) The transmitting node determines the transmission timing (e.g., the reception timing of the synchronization signal). For reception, it depends on the transmission timing (the timing according to the propagation delay difference between nodes).

[0081] ·(iv) Both transmission and reception are asynchronous.

[0082] (3.2) Operating Example 1 In this operating example, the synchronization signal can be configured as any of the following.

[0083] · All nodes transmit synchronization signals with the same configuration.

[0084] That is, all nodes may transmit synchronization signals composed of the same signal. For example, it may be a signal with the same frequency, time component, signal sequence, signal generation method, etc. of the synchronization signal.

[0085] Also, the synchronization signal may include information and / or settings specific to the transmitting node. For example, the identification information (ID) of the node may be included.

[0086] · The wireless communication node transmits synchronization signals with different configurations according to the role, function, type (such as wireless base station / relay device / terminal, etc.), connection state (whether it can be connected to the wireless base station), etc. of the node.

[0087] For example, it may be a signal with at least one of the frequency, time component, signal sequence, signal generation method, etc. of the synchronization signal being different. That is, according to the difference in the role, etc. of the node, synchronization signals (Sync 1, Sync 2 in FIG. 1) with at least a part of the configuration being different (the management sequence number, etc. may not be included) may be transmitted.

[0088] Also, the synchronization signal may include information and / or settings specific to the transmitting node. For example, the identification information (ID), role, function, type, etc. of the node may be included.

[0089] The type of the synchronization signal may be determined by the local node according to the role, function, and type of the node, the connection state, and the presence or absence of the synchronization source signal (for example, whether the GNSS function is installed, whether there is a radio link with the gNB), or may be determined by another node (for example, the destination node or the gNB).

[0090] Also, the transmission timing of the radio signal (radio link) from the node may be the same for all nodes or may be different.

[0091] FIG. 3 shows a timing example (Option 1) of the transmission signal according to Operation Example 1. FIG. 4 shows a timing example (Option 2) of the transmission signal according to Operation Example 1.

[0092] (In the case of Option 1), all nodes may transmit the transmission signal at the same timing. In this case, any of the following synchronization methods for the transmission timing may be applied.

[0093] · Information regarding the transmission timing (for example, propagation delay or information necessary to calculate the propagation delay (Timing Advance (TA), Round-Trip Time (RTT), etc.) is notified.

[0094] This information may be notified from a reference node such as a node related to the radio link to be synchronized (which may be the destination node) or the gNB. Alternatively, other available means implemented in the node such as GNSS may be used.

[0095] (In the case of Option 2), each node may transmit the transmission signal at an individual timing for each node.

[0096] In this case, each node may determine the transmission timing of its own synchronization signal based on the reception timing of the synchronization signal received from the upper node, and determine the timing of the transmission signal according to the transmission timing of the synchronization signal.

[0097] For example, all nodes may transmit at the same temporal position (system frame number, slot, or symbol that may be the same or equivalent (even with propagation delay)). (When transmitting at the reception timing, only the propagation delay between the node and the upper node will cause the transmission timing to be delayed).

[0098] Alternatively, the transmission timing of the synchronization signal may be determined independently (individually) by each node.

[0099] Also, regarding the transmission timing of the transmission signal, the transmission timing of the synchronization signal may be intentionally different (shifted) for each node.

[0100] FIG. 5 shows a timing example of the transmission signal according to Operation Example 1 (Option 3 (Part 1)). FIG. 6 shows a timing example of the transmission signal according to Operation Example 1 (Option 3 (Part 1)).

[0101] Specifically, FIG. 5 corresponds to Option 1 shown in FIG. 3, and FIG. 6 corresponds to Option 2 shown in FIG. 4. In the timing examples shown in FIGS. 5 and 6, time offsets are added respectively.

[0102] (In the case of Option 3), assuming half-duplex communication for each node, each node may avoid transmitting the synchronization signal simultaneously at the timing of receiving the synchronization signal. Different transmission timings may be set for each node. The setting of the transmission timing may be notified from the destination node of the wireless link to be synchronized or a gNB, etc.

[0103] Also, multiple transmission timings may be set for a node. For example, both a transmission timing common to all nodes and a transmission timing specific to each node may be set.

[0104] Furthermore, each node may set a plurality of reception windows for monitoring the transmission timings of a plurality of synchronization signals. As the reception window, for example, a configuration similar to the measurement window that can be set for each carrier (which may be called a sub-carrier) called NR's SSB based RRM Measurement Timing Configuration (SMTC) may be applied.

[0105] Also, as a method of dispersing the transmission and reception timings of each node, the DL / UL frequencies may be switched according to the connection state of the node or the number of connection hops from a reference node (e.g., gNB).

[0106] For example, between Node A and Node B, Frequency A is allocated to DL (Node B reception), and Frequency B is allocated to UL (Node B transmission). On the other hand, between Node B and Node C, Frequency B may be allocated to DL (Node B transmission), and Frequency A may be allocated to UL (Node B reception).

[0107] Also, regarding the timing and conditions for transmitting the synchronization signal, each node may determine them independently, or the start and / or stop of transmitting the synchronization signal etc. may be explicitly (or implicitly) instructed from other nodes (such as the destination node or gNB).

[0108] When each node determines individually, it may be based on information regarding the transmission of the synchronization signal (or it may be a radio signal (radio link)), and timings when the transmission of the synchronization signal becomes possible etc.

[0109] Alternatively, conditions for transmitting the synchronization signal may be defined. For example, according to the synchronization accuracy of the own node (such as whether it is synchronized with the gNB or GNSS), whether to transmit the synchronization signal may be determined.

[0110] Also, the priority of the synchronization signal may be set. For example, the synchronization signal transmitted by a node that has direct or indirect connection means with the gNB or has a synchronization source such as GNSS may be set with a high priority. For example, when the self-node is synchronized based on a synchronization signal with a high priority, the self-node may also transmit a synchronization signal. In such a case, the synchronization signal may include information related to the priority.

[0111] Also, when not using the synchronization signal, the gNB (the node corresponding thereto) may notify other nodes (which may include the UE200) of information related to synchronization between nodes (synchronization signal information). The notification of such information may be by notification in the system information (SIB) or may be realized by signaling such as RRC.

[0112] FIG. 7 shows a configuration example of a radio link between nodes including the gNB (the node corresponding thereto) according to Operation Example 1. Note that Node 1 to 3 (radio communication nodes) shown in FIG. 7 may correspond to the NW node 100 or may correspond to the UE200.

[0113] As shown in FIG. 7, when each of Node 1 to 3 has a radio link with the gNB, that is, a communication means, when synchronizing between nodes, the gNB may notify each node of information related to the propagation delay difference. Each node has a radio link with the gNB (refer to the dotted line), and synchronization is established between each node (refer to the solid line).

[0114] FIG. 8 shows a timing example (including the propagation delay difference) of the transmission signal according to Operation Example 1. The gNB (or other nodes) may, for example, derive the propagation delay from the TA (for example, as the difference of TA / 2 of each node).

[0115] Alternatively, the gNB may derive the propagation delay from the reception timing difference of a signal (such as PRACH) to which the TA is not applied.

[0116] The information regarding the notified propagation delay difference may be assumed to be able to take either positive or negative values. For example, it may be positive for Node 1 and negative for Node 2.

[0117] Also, either one of the nodes may establish synchronization with respect to the other node, or both nodes may establish synchronization respectively.

[0118] Note that the notification of such communication-related information may be triggered by the gNB, or (for example, nodes with equal received power of the gNB, close positions, etc.), each node may trigger it (for example, explore the presence of other nodes in advance and request notification upon detection).

[0119] Also, after synchronization is established, each node may operate as follows.

[0120] · Execute all or part of the initial access with the destination node.

[0121] The initial access may be interpreted, for example, as the transmission, reception, and interpretation of messages according to the random access (RA) procedure. The node that executes the initial access (connecting node) may transmit a PRACH or a channel or signal conforming to the PRACH.

[0122] Also, the destination node may notify information regarding the transmission timing and / or reception timing of the radio link, its own node's identification information (for example, network identifier), etc.

[0123] The connecting node may establish an RRC layer connection with the destination node or a node higher than the destination node.

[0124] Also, the connecting node may notify its own node's information (for example, identification information, node type, etc.) to the destination node. The destination node may add the identification information of the connecting node to the list of nodes connected to its own node.

[0125] Also, the connection node may start monitoring a specific resource (e.g., a control signal) transmitted by the destination node. The monitored information may be notified to the destination node and / or other nodes, for example, together with signals related to synchronization.

[0126] (3.3) Operation Example 2 In this operation example, for the transmission timing of a wireless signal (which may also be a wireless link or a channel, the same applies hereinafter), the operation may be as follows.

[0127] Specifically, the transmission timing for the upper node (e.g., gNB (or a node equivalent to gNB)) and the lower node (e.g., a node that is not a gNB or a node equivalent to gNB, UE, etc.) may be determined according to any of the following.

[0128] FIG. 9 shows an example (Option 1) of the transmission timing of a wireless signal according to Operation Example 2. FIG. 10 shows an example (Option 2) of the transmission timing of a wireless signal according to Operation Example 2. FIG. 11 shows an example (Option 3) of the transmission timing of a wireless signal according to Operation Example 2.

[0129] As shown in FIG. 9, in (Option 1), all nodes align the transmission timing (the method of alignment may be the same as that of the synchronization signal). On the other hand, for reception, it may be different for each node according to the transmission timing (it may be the timing according to the propagation delay difference between nodes).

[0130] As shown in FIG. 10, in (Option 2), contrary to Option 1, for transmission, it may be different for each node according to the reception timing. In this case, information regarding the transmission timing may be notified from the upper node or the lower node.

[0131] On the one hand, for reception, the reception timing of all nodes may be synchronized, or the reception timing may be individually synchronized for each node. When individually synchronizing the reception timing for each node, within the node, the reception timing of all wireless links may be made to coincide. Alternatively, the reception timing may be changed for each wireless link.

[0132] As shown in FIG. 11, in (Option 3), for transmission, the transmitting node may determine the timing (for example, the reception timing of the synchronization signal). On the other hand, for reception, it may vary for each node according to the transmission timing (it may be timing according to the propagation delay difference between nodes).

[0133] Alternatively, as Option 4, the transmission and reception timing may not be adjusted or controlled at all and may be asynchronous. That is, synchronization between the system and nodes may not be taken, and for example, the timing synchronization may be corrected for each communication.

[0134] Also, different options may be selected from the above-described options according to the functions and roles of the connected nodes and / or the own node, the connection method, signals, channel types, etc.

[0135] Note that since a resource collision between the transmission signal and the reception signal may occur according to the transmission and reception timing within the node, information necessary for switching the transmission resource and the reception resource, etc. for collision avoidance may be notified and exchanged.

[0136] (4) Operations and Effects According to the above-described embodiments, the following operations and effects can be obtained. Specifically, a wireless communication node (a node corresponding to a gNB, NW Node 100, or UE 200) may set at least any one of the plurality of synchronization signals based on the function or connection state of the wireless communication node.

[0137] Also, the wireless communication node may assume that all wireless communication nodes in the wireless communication system 10 synchronize (make coincide) the transmission or reception timing.

[0138] According to such a wireless communication node, in a flexible network and a mesh network, etc., even when a flexible network function arrangement is assumed in combination with various network topologies, it is possible to quickly and surely establish synchronization with various wireless communication nodes having different provided functions.

[0139] Further, the wireless communication node may make the transmission timing of the synchronization signal different from the transmission timing of the synchronization signal in other wireless communication nodes. Thereby, collision of the synchronization signal between nodes can be avoided, and synchronization between wireless communication nodes can be established more surely.

[0140] The wireless communication node may set at least any one of a plurality of synchronization signals based on the received synchronization signal information, and determine the transmission timing of the synchronization signal from its own node. For this reason, synchronization between wireless communication nodes can be established more surely by a reasonable method in which a plurality of wireless communication nodes cooperate.

[0141] (5) Other Embodiments As described above, the embodiments have been described, but it is obvious to those skilled in the art that the present invention is not limited to the description of the embodiments, and various modifications and improvements are possible.

[0142] For example, in the above-described embodiments, the term of the wireless communication node (NW node) is used, but as described above, it may be replaced with other similar terms such as a network device.

[0143] In the above-described embodiments, the terms of the downlink (DL) and the uplink (UL) are used, but they may be called by other terms. For example, they may be replaced with or associated with terms such as a forward link, a reverse link, an access link, and a backhaul. Alternatively, simply terms such as a first link, a second link, a first direction, and a second direction may be used.

[0144] Also, in the above description, "configure", "activate", "update", "indicate", "enable", "specify", "select" may be mutually interchanged. Similarly, "link", "associate", "correspond", "map" may be mutually interchanged, and "allocate", "assign", "monitor", "map" may also be mutually interchanged.

[0145] Furthermore, "specific", "dedicated", "UE-specific", "UE-dedicated" may be mutually interchanged. Similarly, "common", "shared", "group-common", "UE-common", "UE-shared" may be mutually interchanged.

[0146] Also, the block configuration diagram (Figure 2) used in the description of the above embodiments shows blocks in terms of functional units. These functional blocks (components) are realized by any combination of at least one of hardware and software. Also, the realization method of each functional block is not particularly limited. That is, each functional block may be realized using one physically or logically combined device, or two or more physically or logically separated devices may be directly or indirectly (for example, using wired, wireless, etc.) connected and realized using these multiple devices. The functional block may be realized by combining software with the above one device or the above multiple devices.

[0147] The functions include, but are not limited to, judgment, decision-making, determination, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, solution, selection, selection determination, establishment, comparison, assumption, expectation, consideration, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating (mapping), assigning, etc. For example, a functional block (component) that enables transmission is called a transmitting unit or a transmitter. As described above, the implementation method is not particularly limited.

[0148] Furthermore, the above-described NW node 100 and UE 200 (the device) may function as a computer that performs the processing of the wireless communication method of the present disclosure. FIG. 12 is a diagram showing an example of the hardware configuration of the device. As shown in FIG. 12, the device 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, and a bus 1007, etc.

[0149] In the following description, the term "device" can be read as a circuit, device, unit, etc. The hardware configuration of the device may be configured to include one or more of each device shown in the figure, or may be configured without including some devices.

[0150] Each functional block of the device (see FIG. 2) is realized by any hardware element of the computer device or a combination of the hardware elements.

[0151] In addition, each function in the device is realized by causing a predetermined software (program) to be loaded onto hardware such as the processor 1001 and the memory 1002, so that the processor 1001 performs operations, controls communication by the communication device 1004, or controls at least one of reading and writing data in the memory 1002 and the storage 1003.

[0152] The processor 1001 controls the entire computer by operating, for example, an operating system. The processor 1001 may be constituted by a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, registers, and the like.

[0153] In addition, the processor 1001 reads a program (program code), a software module, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and executes various processes according to these. As the program, a program that causes a computer to execute at least a part of the operations described in the above embodiments is used. Further, the above various processes 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. Note that the program may be transmitted from a network via a telecommunication line.

[0154] The memory 1002 is a computer-readable recording medium and may be constituted by at least one of, for example, Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), Random Access Memory (RAM), etc. The memory 1002 may also be referred to as a register, a cache, a main memory (main storage device), etc. The memory 1002 can store a program (program code), a software module, etc. that can execute the method according to an embodiment of the present disclosure.

[0155] The storage 1003 is a computer-readable recording medium and may be constituted by at least one of, for example, an optical disc such as a Compact Disc ROM (CD-ROM), a hard disk drive, a flexible disk, a magneto-optical disk (e.g., a compact disc, a digital versatile disc, a Blu-ray (registered trademark) disc), a smart card, a flash memory (e.g., a card, a stick, a key drive), a floppy (registered trademark) disk, a magnetic strip, etc. The storage 1003 may also be referred to as an auxiliary storage device. The above-described recording medium may be, for example, a database, a server, or other appropriate media including at least one of the memory 1002 and the storage 1003.

[0156] The communication device 1004 is hardware (a transmission / reception device) for performing communication between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, a communication module, etc.

[0157] The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. in order to implement at least one of, for example, Frequency Division Duplex (FDD) and Time Division Duplex (TDD).

[0158] The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that receives an external input. The output device 1006 is an output device (for example, a display, a speaker, an LED lamp, etc.) that performs an output to the outside. Note that the input device 1005 and the output device 1006 may have an integrated configuration (for example, a touch panel).

[0159] Also, each device such as the processor 1001 and the memory 1002 is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus or may be configured using different buses for each device.

[0160] 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), a Field Programmable Gate Array (FPGA), etc., and part or all of each functional block may be realized by the hardware. For example, the processor 1001 may be implemented using at least one of these hardware components.

[0161] In addition, the notification of information is not limited to the aspects / embodiments described in the present disclosure, and other methods may be used. For example, the notification of information may be implemented by physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI)), upper layer signaling (e.g., RRC signaling, Medium Access Control (MAC) signaling, notification information (Master Information Block (MIB), System Information Block (SIB))), other signals, or combinations thereof. Also, 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, etc.

[0162] Each aspect / embodiment described in the present disclosure may be applied to at least one of systems using Long Term Evolution (LTE), LTE-Advanced (LTE-A), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 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), other suitable systems, and next-generation systems extended based thereon. Also, a plurality of systems may be combined (e.g., a combination of at least one of LTE and LTE-A and 5G) and applied.

[0163] For each processing procedure, sequence, flowchart, etc. described in this disclosure, the order may be changed as long as there is no contradiction. For example, for the methods described in this disclosure, the elements of various steps are presented using an exemplary order and are not limited to the specific order presented.

[0164] Specific operations assumed to be performed by a base station in this disclosure may, in some cases, be performed by its upper node. In a network consisting of one or more network nodes having a base station, it is clear that various operations performed for communication with a terminal can be performed by at least one of the base station and other network nodes other than the base station (for example, but not limited to, MME or S-GW, etc.). Although the case where there is one other network node other than the base station is exemplified above, a combination of a plurality of other network nodes (for example, MME and S-GW) may also be possible.

[0165] Information, signals (such as information) can be output from an upper layer (or lower layer) to a lower layer (or upper layer). They may also be input and output via a plurality of network nodes.

[0166] The input and output information may be stored in a specific location (for example, memory) or may be managed using a management table. The input and output information can be overwritten, updated, or appended. The output information may be deleted. The input information may be transmitted to other devices.

[0167] The determination may be made based on a value represented by 1 bit (0 or 1), or may be made based on a Boolean value (true or false), or may be made by comparing numerical values (for example, comparison with a predetermined value).

[0168] Each aspect / embodiment described in the present disclosure may be used alone, in combination, or may be switched and used during execution. Further, the notification of predetermined information (for example, the notification of "being X") is not limited to being explicitly performed, and may be performed implicitly (for example, by not performing the notification of the predetermined information).

[0169] Software should be broadly interpreted to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, etc., whether called software, firmware, middleware, microcode, a hardware description language, or by any other name.

[0170] Also, software, instructions, information, etc. may be transmitted and received via a transmission medium. For example, when software is transmitted from a website, server, or other remote source using at least one of wired technologies (such as coaxial cable, optical fiber cable, twisted pair, Digital Subscriber Line (DSL), etc.) and wireless technologies (such as infrared, microwave, etc.), at least one of these wired technologies and wireless technologies is included within the definition of the transmission medium.

[0171] The information, signals, etc. described in the present disclosure may be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc., which may be referred to throughout the above description, may be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0172] In addition, with regard to the terms described in the present disclosure and the terms necessary for understanding the present disclosure, they 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). Also, the signal may be a message. Further, a component carrier (CC) may be referred to as a carrier frequency, a cell, a frequency carrier, or the like.

[0173] The terms "system" and "network" used in the present disclosure are used interchangeably.

[0174] Also, the information, parameters, etc. described in the present disclosure may be represented using absolute values, relative values from a predetermined value, or corresponding other information. For example, a radio resource may be indicated by an index.

[0175] The names used for the above-described parameters are not limiting names in any respect. Furthermore, mathematical formulas, etc. using these parameters may be different from those explicitly disclosed in the present disclosure. Since various channels (e.g., PUCCH, PDCCH, etc.) and information elements can be identified by any suitable names, the various names assigned to these various channels and information elements are not limiting names in any respect.

[0176] In the present 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. The base station may also be referred to by terms such as macro cell, small cell, femto cell, and pico cell.

[0177] A base station can accommodate one or more (e.g., three) cells (also called sectors). When a base station accommodates multiple cells, the entire coverage area of the base station can be divided into multiple smaller areas, and each of the smaller areas can also provide communication services by a base station subsystem (e.g., a small indoor base station (Remote Radio Head: RRH)).

[0178] The term "cell" or "sector" refers to a part or the whole of the coverage area of at least one of the base station and the base station subsystem that provides communication services within this coverage.

[0179] In the present disclosure, terms such as "Mobile Station (MS)", "user terminal", "User Equipment (UE)", and "terminal" may be used interchangeably.

[0180] 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 term.

[0181] 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. Note that at least one of the base station and the mobile station may be a device mounted on a moving body, the moving body itself, etc. The moving body may be a vehicle (e.g., a car, an airplane, etc.), a moving body that moves unmanned (e.g., a drone, a self-driving vehicle, etc.), or a robot (humanoid or unmanned). Note that at least one of the base station and the mobile station also includes a device that does not necessarily move during communication operation. 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.

[0182] Also, the base station in the present disclosure may be read as a mobile station (user terminal, the same hereinafter). For example, for a configuration in which communication between the base station and the mobile station is replaced with communication between a plurality of mobile stations (which may be referred to as, for example, Device-to-Device (D2D), Vehicle-to-Everything (V2X), etc.), each aspect / embodiment of the present disclosure may be applied. In this case, the functions of the base station may be configured as those of the mobile station. Also, terms such as "uplink" and "downlink" may be read as terms corresponding to inter-terminal communication (e.g., "side"). For example, an uplink channel, a downlink channel, etc. may be read as a side channel (or sidelink).

[0183] Similarly, the mobile station in the present disclosure may be read as a base station. In this case, the functions of the mobile station may be configured as those of the base station. A wireless frame may be composed of one or more frames in the time domain. Each of the one or more frames in the time domain may be called a subframe. A subframe may further be composed of one or more slots in the time domain. A subframe may have a fixed time length (e.g., 1 ms) that does not depend on numerology.

[0184] Numerology may be communication parameters applied to at least one of transmission and reception of a certain signal or channel. Numerology may indicate, for example, at least one of subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, wireless frame configuration, specific filtering processing performed by a transceiver in the frequency domain, specific windowing processing performed by a transceiver in the time domain, etc.

[0185] A slot may be composed of one or more symbols (Orthogonal Frequency Division Multiplexing (OFDM) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, etc.) in the time domain. A slot may be a time unit based on numerology.

[0186] The slot may include a plurality of mini-slots. Each mini-slot may be composed of one or more symbols in the time domain. Also, the mini-slot may be called a sub-slot. The mini-slot may be composed of a smaller number of symbols than the slot. The PDSCH (or PUSCH) transmitted in a time unit larger than the mini-slot may be called PDSCH (or PUSCH) mapping type A. The PDSCH (or PUSCH) transmitted using the mini-slot may be called PDSCH (or PUSCH) mapping type B.

[0187] The radio frame, sub-frame, slot, mini-slot, and symbol all represent time units for transmitting signals. Different names corresponding to each of them may be used.

[0188] For example, one sub-frame may be called a transmission time interval (TTI), or a plurality of consecutive sub-frames may be called a TTI, or one slot or one mini-slot may be called a TTI. That is, at least one of the sub-frame and the TTI may be the sub-frame (1 ms) in the existing LTE, or a period shorter than 1 ms (for example, 1 - 13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, a mini-slot, etc. instead of a sub-frame.

[0189] Here, the TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in the LTE system, the base station performs scheduling to allocate radio resources (such as the frequency bandwidth and transmission power that can be used at each user terminal) to each user terminal in TTI units. Note that the definition of the TTI is not limited to this.

[0190] The TTI may be a transmission time unit such as a channel-coded data packet (transport block), a code block, a codeword, etc., or may be a processing unit such as scheduling or link adaptation. When the TTI is given, the time interval (e.g., the number of symbols) in which a transport block, a code block, a codeword, etc. are actually mapped may be shorter than the TTI.

[0191] Note that when one slot or one mini-slot is called a TTI, one or more TTIs (i.e., one or more slots or one or more mini-slots) may be the minimum time unit for scheduling. Also, the number of slots (mini-slots) constituting the minimum time unit for the scheduling may be controlled.

[0192] A TTI having a time length of 1 ms may be called a normal TTI (TTI in LTE Rel.8 - 12), a normal TTI, a long TTI, a normal subframe, a normal subframe, a long subframe, a slot, etc. A TTI shorter than the normal TTI may be called a shortened TTI, a short TTI, a partial TTI, a shortened subframe, a short subframe, a mini-slot, a sub-slot, a slot, etc.

[0193] Note that a long TTI (e.g., a normal TTI, a subframe, etc.) may be read as a TTI having a time length exceeding 1 ms, or a short TTI (e.g., a shortened TTI, etc.) may be read as a TTI having a TTI length less than that of the long TTI and not less than 1 ms.

[0194] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and in the frequency domain, it may include one or more consecutive subcarriers. The number of subcarriers included in the RB may be the same regardless of the numerology, for example, it may be 12. The number of subcarriers included in the RB may be determined based on the numerology.

[0195] Also, the time domain of the RB may include one or more symbols, and may be the length of 1 slot, 1 mini-slot, 1 sub-frame, or 1 TTI. 1 TTI, 1 sub-frame, etc. may each be composed of one or more resource blocks.

[0196] Note that one or more RBs may be referred to as physical resource blocks (PRBs), sub-carrier groups (SCGs), resource element groups (REGs), PRB pairs, RB pairs, etc.

[0197] Also, the resource block may be composed of one or more resource elements (REs). For example, 1 RE may be a radio resource area of 1 sub-carrier and 1 symbol.

[0198] The bandwidth part (BWP) (which may also be called a partial bandwidth, etc.) may represent a subset of consecutive common resource blocks (common RBs) for a certain numerology in a certain carrier. Here, the common RB may be specified by the index of the RB based on the common reference point of the carrier. The PRB is defined in a certain BWP and may be numbered within the BWP.

[0199] The BWP may include a BWP for UL (UL BWP) and a BWP for DL (DL BWP). One or more BWPs may be set within 1 carrier for the UE.

[0200] At least one of the set BWPs may be active, and the UE may not be assumed to transmit and receive a predetermined signal / channel outside the active BWP. Note that "cell", "carrier", etc. in the present disclosure may be read as "BWP".

[0201] The structures such as the above-mentioned radio frames, sub-frames, slots, mini-slots, and symbols are merely illustrative. For example, the number of sub-frames included in a radio frame, the number of slots per sub-frame or radio frame, the number of mini-slots included in a slot, the number of symbols and RBs included in a slot or mini-slot, the number of sub-carriers included in an RB, and the number of symbols, symbol length, Cyclic Prefix (CP) length, etc. within a TTI can be variously changed.

[0202] The terms "connected" and "coupled", or any variations thereof, mean any direct or indirect connection or coupling between two or more elements, and can include the presence of one or more intermediate elements between two elements "connected" or "coupled" to each other. The coupling or connection between elements can be physical, logical, or a combination thereof. For example, "connected" may be read as "accessed". As used in this disclosure, two elements can be considered to be "connected" or "coupled" to each other using at least one of one or more wires, cables, and printed electrical connections, and also, as some non-limiting and non-exhaustive examples, electromagnetic energy having wavelengths in the radio frequency region, microwave region, and optical (both visible and invisible) region.

[0203] The reference signal can also be abbreviated as Reference Signal (RS) and may be called a Pilot depending on the applicable standard.

[0204] As used in this disclosure, the description "based on" does not mean "based only on" unless otherwise specified. In other words, the description "based on" means both "based only on" and "based at least on".

[0205] In the configurations of the above-described apparatuses, the "means" may be replaced with "section", "circuit", "device", or the like.

[0206] Any reference in this disclosure to elements using terms such as "first", "second", etc. does not generally limit the quantity or order of those elements. These terms may be used in this disclosure as a convenient way to distinguish between two or more elements. Thus, a reference to a first and a second element does not mean that only two elements can be employed there, or that the first element must precede the second element in any way.

[0207] In this disclosure, when terms such as "include", "including", and their variants are used, these terms are intended to be inclusive, similar to the term "comprising". Further, the term "or" used in this disclosure is not intended to be an exclusive disjunction.

[0208] In this disclosure, for example, when articles are added by translation, such as a, an, and the in English, this disclosure may include that the nouns following these articles are in the plural form.

[0209] As used in this disclosure, the terms "determining" and "deciding" may encompass a wide variety of actions. "Determining" and "deciding" may include, for example, judging, calculating, computing, processing, deriving, investigating, looking up, searching, inquiring (e.g., looking up in a table, database, or another data structure), and considering something ascertained as "determined" or "decided". Further, "determining" and "deciding" may include considering something received (e.g., receiving information), transmitted (e.g., transmitting information), input, output, accessed (e.g., accessing data in memory) as "determined" or "decided". Also, "determining" and "deciding" may include considering something resolved, selected, chosen, established, compared, etc. as "determined" or "decided". That is, "determining" and "deciding" may include considering that some action has been "determined" or "decided". Also, "determining (deciding)" may be read as "assuming", "expecting", "considering", etc.

[0210] In this disclosure, the term "A and B are different" may mean that "A and B are different from each other". Note that the term may also mean that "A and B are each different from C". Terms such as "separated" and "coupled" may also be interpreted in the same way as "different".

[0211] As described in detail above, it is obvious to those skilled in the art that the present disclosure is not limited to the embodiments described in the present disclosure. The present disclosure can be implemented in modified and changed 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 for illustrative purposes only and has no restrictive meaning for the present disclosure.

Explanation of Signs

[0212] 10 Wireless communication system 40 Aircraft 50 Drone 60 Vehicle 100 NW Node 110 Wireless signal transceiver 120 Amplifier unit 130 Modulation / demodulation unit 140 Control signal / reference signal processing unit 150 Encoding / decoding unit 160 Data transceiver 170 Control unit 200 UE 1001 Processor 1002 Memory 1003 Storage 1004 Communication device 1005 Input device 1006 Output device 1007 Bus

Claims

**Claim 1** A transmitting unit that transmits a plurality of synchronization signals having different configurations, A control unit that sets at least one of the plurality of synchronization signals based on the function or connection state of the wireless communication node A wireless communication node comprising the above. **Claim 2** The wireless communication node according to claim 1, wherein the control unit makes the transmission timing of the synchronization signal different from the transmission timing of the synchronization signal in other wireless communication nodes. **Claim 3** A receiving unit that receives synchronization signal information regarding the synchronization signal is provided, The wireless communication node according to claim 1, wherein the control unit sets at least one of the plurality of synchronization signals based on the synchronization signal information and determines the transmission timing of the synchronization signal. **Claim 4** A step of transmitting a plurality of synchronization signals having different configurations, A step of setting at least one of the plurality of synchronization signals based on the function or connection state of the wireless communication node A wireless communication method including the above.

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