Wireless communication node and communication method

Abstract

According to one aspect of the present disclosure, a wireless communication node is provided that comprises: a control unit for controlling a first wireless link with an upper node and a second wireless link with a lower node; and a reception unit for receiving, from the upper node, a beam notification that indicates the beam usable or unusable in the second wireless link with regard to wireless resources used for the first wireless link.

Description

Technical Field

[0001] The present disclosure relates to a wireless communication node and a wireless communication method.

[0002] In a Universal Mobile Telecommunication System (UMTS) network, Long Term Evolution (LTE) has been standardized for the purpose of further high data rates, low latency, etc. Also, a successor system to LTE is being considered for the purpose of further broadband and high speed from LTE. Successor systems to LTE include, for example, systems called LTE-Advanced (LTE-A), Future Radio Access (FRA), 5th generation mobile communication system (5G), 5G plus (5G+), Radio Access Technology (New-RAT), New Radio (NR), etc.

[0003] Also, in NR, the technology of Integrated Access and Backhaul (IAB) that integrates the access link and the backhaul link is being considered. In IAB, a wireless communication node such as an IAB node forms a wireless access link with a terminal (User Equipment (UE)) and also forms a wireless backhaul link with other IAB nodes, a radio base station, etc.

[0004] An IAB node has a Mobile Termination (MT) which is a function for wireless communication with a parent node (another IAB node located one upstream) and a Distributed Unit (DU) which is a function for wireless communication with a child node (another IAB node located one downstream) or a terminal. Hereinafter, the MT of the IAB node may be described as "IAB-MT" and the DU of the IAB node may be described as "IAB-DU".

[0005] Also, 3GPP (3rd In the Generation Partnership Project, in order to facilitate the simultaneous operation and interference management of IAB nodes, it is being considered to support dynamic indication (in the upstream direction and / or downstream direction) of beam restrictions / usage / availability.

Prior Art Documents

Non-Patent Documents

[0006]

Non-Patent Document 1

Summary of the Invention

[0007] In 3GPP Release 17, it has been agreed that the parent node notifies the child node of the beams that are available or unavailable at the IAB-DU of the child node.

[0008] One problem of the present disclosure is to provide a scheme for notifying available or unavailable beams at an IAB node.

[0009] According to one aspect of the present disclosure, there is provided a wireless communication node including a control unit that controls a first wireless link with a higher-level node and a second wireless link with a lower-level node, and a reception unit that receives from the higher-level node a beam notification indicating a beam that is available or unavailable in the second wireless link with respect to the wireless resources used in the first wireless link.

Brief Description of the Drawings

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Mode for Carrying Out the Invention

[0011] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings.

[0012] <Wireless Communication System> FIG. 1 is a schematic diagram showing a wireless communication system according to an embodiment of the present disclosure. The wireless communication system 1 is a wireless communication system according to NR (New Radio), and is composed of a plurality of wireless communication nodes and terminals. However, the wireless communication system 1 is not limited thereto, and may be a wireless communication system according to a method called Beyond 5G, 5G Evolution or 6G.

[0013] The wireless communication system 1 includes a plurality of IAB nodes 10A to 10C, which are examples of wireless communication nodes, and a UE 20, which is an example of a user terminal. Hereinafter, when explaining without distinguishing the IAB nodes 10A to 10C, only the common numbers in the reference signs may be used as in "IAB node 10".

[0014] The IAB nodes 10A to 10C are each connected to other IAB nodes 10 by wireless communication. In FIG. 1, the IAB node 10B is connected to the IAB node 10A. The IAB node 10C is connected to the IAB node 10B. Hereinafter, the IAB node 10A upstream (that is, in the direction approaching the IAB donor) as viewed from the IAB node 10B is called the parent IAB node 10A or the upper IAB node 10A, and the IAB node 10C downstream (that is, in the direction away from the IAB donor) as viewed from the IAB node 10B is called the child IAB node 10C or the lower node 10C.

[0015] Note that the description "parent IAB node 10A" indicates that it is the parent IAB node with respect to the IAB node 10B, and "child IAB node 10C" indicates that it is the child IAB node with respect to the IAB node 10B. In other words, the IAB node 10B corresponds to the child IAB node with respect to the "parent IAB node 10A" and corresponds to the parent IAB node with respect to the "child IAB node 10C".

[0016] The IAB nodes 10A to 10C may each form a cell which is an area where wireless communication is possible. That is, the IAB node 10 may have a function as a base station. The UE 20 within the cell can be wirelessly connected to the IAB node 10 forming the cell.

[0017] In addition, the IAB node 10A may be connected to the core network (CN) through a fiber backhaul (BH). In this case, the IAB node 10A may be called an IAB donor. Also, in FIG. 1, the number of IAB nodes 10 is 3 and the number of UEs 20 is 1, but the number of IAB nodes 10 and the number of UEs 20 included in the wireless communication system 1 may be any number. Also, the number of parent IAB nodes for one IAB node 10 may be two or more, and the number of child IAB nodes for one IAB node 10 may be two or more.

[0018] Note that L shown in FIG. 1 and its subscript indicate the following. ·L P,DL indicates the downlink (DL; downlink) from the parent IAB node 10A to the IAB node 10B. ·L P,UL indicates the uplink (UL; uplink) from the IAB node 10B to the parent IAB node 10A. ·L C,DL indicates the DL from the IAB node 10B to the child IAB node 10C. ·L C,UL indicates the UL from the child IAB node 10C to the IAB node 10B. ·L A,DL indicates the DL from the IAB node 10B to the UE 20. ·L A,UL indicates the UL from the UE 20 to the IAB node 10B.

[0019] <IAB Node> FIG. 2 is a block diagram showing a configuration example of an IAB node according to an embodiment of the present disclosure.

[0020] As shown in FIG. 2, the IAB donor 10A includes a control unit 100, a Central Unit (CU) 101, and a Distributed Unit (DU) 103. The IAB nodes 10B and 10C include a control unit 100, a Mobile-Termination (MT) 102, and a DU 103. Note that the CU 101, MT 102, and DU 103 may be functional blocks. Hereinafter, when expressing the functions of the CU 101, the reference numeral may not be attached and it may be expressed simply as CU. Also, when expressing the functions of the MT 102, the reference numeral may not be attached and it may be expressed simply as MT. Further, when expressing the functions of the DU 103, the reference numeral may not be attached and it may be expressed simply as DU. Also, the DU 103 may have functions corresponding to a base station or a relay station. Further, an example of the MT 102 may have functions corresponding to a terminal.

[0021] The IAB node 10B is connected to an upstream IAB node (IAB donor 10A in FIG. 2) by the MT 102. That is, the MT 102 of the IAB node 10B processes the connection with the parent IAB node 10A.

[0022] The IAB node 10B is connected to the UE 20 and the MT of the downstream IAB node 10C by the DU 103. That is, the DU 103 of the IAB node 10B processes the connection with the UE 20 and the child IAB node 10C. The connection with the UE 20 and / or the child IAB node 10C by the DU 103 may be performed, for example, by establishing a Radio Resource Control (RRC) channel.

[0023] The control unit 100 controls the MT 102 (CU 101 in the case of the IAB donor 10A) and the DU 103. Note that the operations of the IAB node 10 described below may be realized by the control unit 100 controlling the MT 102 (CU 101 in the case of the IAB donor) and the DU 103. Also, the control unit 100 may include a storage unit for storing various information.

[0024] The parent IAB node 10A indicates the following time resources for the link with the parent IAB node 10A (hereinafter referred to as the "parent link") from the perspective of the MT102 of the IAB node 10B. · DL time resource (time resource used for DL) · UL time resource (time resource used for UL) · Flexible (hereinafter referred to as "FL") time resource (time resource used for DL or UL)

[0025] The IAB node 10B has the following types of time resources in the link between the IAB node 10B and the child IAB node 10C and / or the link between the IAB node 10B and the UE20 (hereinafter, these links are referred to as "child links") from the perspective of the DU103 of the IAB node 10B. Note that the "type" of the resource may be read as other terms such as the "usage", "type", "category", "classification", or "attribute" of the resource. · DL time resource · UL time resource · FL time resource · Not-available (hereinafter referred to as "NA") time resource (resource not used for the communication of the child link of the DU)

[0026] The DL, UL, and FL time resources of the child link of the DU belong to one of the following two classifications, respectively. · Hard: The corresponding time resource is always available for the child link of the DU. · Soft: The availability of the corresponding time resource for the child link of the DU is controlled explicitly and / or implicitly by the parent IAB node 10A.

[0027] Note that the configuration example of IAB shown in FIG. 2 is not necessarily limited to such a configuration. For example, in the wireless backhaul, IAB may be configured by tunneling using the GPRS Tunneling Protocol (GTP)-U / User Datagram Protocol (UDP) / Internet Protocol (IP).

[0028] The main advantages of such IAB include the ability to flexibly and densely deploy NR cells without increasing the density of the transport network. IAB can be applied to various scenarios, such as the deployment of small cells outdoors, indoors, and even the support of mobile relays (e.g., in buses and trains).

[0029] Also, as shown in FIGS. 1 and 2, IAB may support the deployment by a stand-alone (SA) of only NR or a non-stand-alone (NSA) including other RATs (such as LTE).

[0030] In this embodiment, the wireless access and the wireless backhaul can operate as half-duplex or full-duplex communication. Also, as multiplexing methods, time-division multiplexing (TDM), frequency-division multiplexing (FDM), and space-division multiplexing (SDM) can be used. That is, in this embodiment, FDM or SDM is used to realize the simultaneous operation of the DU and MT of the IAB node.

[0031] In addition to the above-described IAB, the wireless communication node 100 and the UE 200 can support Massive MIMO that generates a more directional antenna 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 simultaneously communicates between the UE and a plurality of NG-RAN Nodes, respectively.

[0032] In addition, the channels used in wireless communication include a control channel and a data channel. The control channel includes a Physical Downlink Control Channel (PDCCH), a Physical Uplink Control Channel (PUCCH), a Physical Random Access Channel (PRACH), Downlink Control Information (DCI) including a Random Access Radio Network Temporary Identifier (RA-RNTI), and a Physical Broadcast Channel (PBCH). Note that, as reference signals that may be included in the control channel, a Channel State Information-Reference Signal (CSI-RS), a Sounding Reference Signal (SRS), and a Positioning Reference Signal (PRS) for location information may be included. Also, the data channel includes a Physical Downlink Shared Channel (PDSCH), a Physical Uplink Shared Channel (PUSCH), and the like. Data may mean the data transmitted via the data channel.

[0033] The control unit 100 controls the notification (beam notification) of information regarding the antenna beam BM used by the IAB node (IAB-MT and IAB-DU). For the reception of PDSCH or PDCCH (demodulation reference signal (DMRS)), in NR, a Transmission Configuration Indication (TCI) state is set (alternatively, when not set, it may be the SSB index and QCL relationship at the time of the most recent PRACH transmission).

[0034] The QCL relationship may include both the case where it is explicitly set by the TCI state and the case where the TCI state is not set. The QCL / TCI state / beam (antenna beam) may be mutually interchangeable.

[0035] The beam notification may include any information regarding such QCL / TCI state / beam. That is, the beam notification may be an index (SSB index) that identifies an SSB (SS / PBCH Block), which is a block of a synchronization signal or a notification channel composed of an SS (Synchronization Signal) and a PBCH (Physical Broadcast Channel). The beam notification will be further described later.

[0036] <Consideration> In Release 17, for the simultaneous operation or transmission of the MT102 and the DU103 of the IAB node 10B, it is agreed that the parent IAB node 10A can notify the IAB node 10B of a beam set that is unavailable, restricted, or not preferred (hereinafter collectively referred to as an unavailable beam set) in the DU103 (IAB-DU) of the IAB node 10B. That is, regarding the simultaneous operation of the MT and the DU, the parent IAB node 10A can dynamically notify the IAB node 10B of an unavailable beam set in the DU103 (IAB-DU) of the IAB node 10B. Thereby, the beams used in the parent IAB node 10A and the MT102 of the IAB node 10B and the beams used in the DU103 of the IAB node 10B can be managed, and interference can be avoided.

[0037] Such available and / or unavailable beams can be transmitted via radio resource control (RRC), medium access control (MAC) control element (CE), or downlink control information (DCI). Also, in Release 16's Multiple-Input Multiple-Output (MIMO), simultaneous beam notification across multiple bandwidth parts (BWPs) or component carriers (CCs) is used to achieve low-latency and / or low-overhead beam notification.

[0038] On the other hand, a specific notification scheme for notifying available and / or unavailable DU beams in the IAB-DU has not been specified yet. For example, available and / or unavailable DU beams may be notified for each MT serving cell, MT BWP, or DU cell via MAC CE, but the details of the design of such MAC CE have not been specified. Also, if simultaneous notification of available and / or unavailable DU beams across multiple MT serving cells, multiple MT BWPs, or multiple DU cells is supported, it is advantageous for overhead reduction. For this reason, simultaneous notification of available and / or unavailable beams across multiple MT serving cells or multiple MT BWPs can be considered. Furthermore, simultaneous notification of available and / or unavailable beams across multiple DU cells can also be considered.

[0039] Note that in the following embodiments, the MT beam is an uplink and downlink beam transmitted and received between the parent IAB node 10A and the MT103 of the IAB node 10B. For example, it may indicate the synchronization signal block (SSB), channel state information reference signal (CSI-RS), sounding reference signal (SRS), spatialRelationInfo, Release 17 uplink transmission configuration indicator (Rel-17 UL TCI), Rel-17 joint UL and DL TCI, the code point of the SRS resource indicator (SRI) field in the DCI, or the code point of the TCI field in the DCI of the MT serving cell or MT BWP. Also, the DU beam is an uplink and downlink beam transmitted and received between the DU103 of the IAB node 10B and the child IAB node 10C or the UE200, and may indicate the SSB, CSI-RS, or SRS of the DU cell.

[0040] In addition, the following embodiments may be applicable to beam management (BM), SRS used as CB and / or NCB, SRS that is periodic, semi-persistent, and / or aperiodic, or CSI-RS that is periodic, semi-persistent, and / or aperiodic.

[0041] In the following embodiments, a specific scheme for the parent IAB node 10A to notify the DU 103 (IAB-DU) of the IAB node 10B of selected or non-selected beams will be described. That is, in the following embodiments, beam notification is not limited to notification of unavailable beam sets, and available, recommended, or preferred beam sets (hereinafter collectively referred to as available beam sets) may be notified to the IAB node 10B. Alternatively, both available beam sets and unavailable beam sets may be notified.

[0042] <Overview of the proposed scheme> As proposed scheme 1, DU beams that are available or unavailable in one or more MT serving cells, one or more MT bandwidth parts (MT BWPs), or one or more DU cells may be notified by a MAC CE including any of the following information. · Information on DU beams of one or more DU cells for an MT serving cell or an MT BWP · Information on DU beams of one or more DU cells for one MT beam of an MT serving cell or an MT BWP · Information on DU beams of one or more DU cells for a plurality of MT serving cells or MT BWPs · Information on DU beams of one or more DU cells for a plurality of MT beams of an MT serving cell or an MT BWP · Information on DU beams of one or more DU cells for a plurality of MT beams of a plurality of MT serving cells or MT BWPs

[0043] Also, as proposed scheme 2, a list of a plurality of MT serving cells or MT BWPs is set to notify available or unavailable DU beams for the plurality of MT serving cells or MT BWPs.

[0044] Furthermore, as proposed scheme 3, a list of a plurality of DU cells is set to notify available or unavailable DU beams for the plurality of DU cells.

[0045] <Proposed Scheme 1> In proposed scheme 1, available and / or unavailable DU beams are notified by MAC CE which will be described later with reference to FIGS. 3 to 12. Note that, in the following embodiments, beam notification is performed via MAC CE, but the beam notification according to the present disclosure is not limited thereto and may be transmitted via radio resource control (RRC) or downlink control information (DCI).

[0046] In this embodiment, the MAC CE notifies a set of DU beams from a single DU cell for a single MT serving cell or MT BWP.

[0047] FIG. 3 is a diagram showing DU beam notification according to an embodiment of the present disclosure. In the embodiment shown in FIG. 3, the MAC CE notifies a DU beam set of a single DU cell for a single MT serving cell and / or MT BWP. Specifically, the MAC CE indicates an MT serving cell ID that identifies a single MT serving cell, an MT BWP ID that identifies a single MT BWP, and a DU cell ID that identifies a single DU cell, and further indicates a DU beam ID that is available or unavailable in the corresponding DU cell.

[0048] According to the illustrated MAC CE, when the MT serving cell corresponding to the "MT Serving cell ID" notified in the MAC CE from the parent IAB node 10A and / or the MT BWP corresponding to the "MT BWP ID" are being used by the MT102 (IAB-MT) of the IAB node 10B, the DU103 (IAB-DU) of the IAB node 10B may or may not be able to use (N + 1) DU beams corresponding to "DU beam ID 0" to "DU beam ID N" in the DU cell corresponding to the "DU cell ID". Note that "R" in the illustrated MAC CE means reserved. When receiving the MAC CE from the parent IAB node 10A, if the MT102 of the IAB node 10B is using the MT serving cell and / or MT BWP notified in the MAC CE, the DU103 of the IAB node 10B will use the notified DU beam (in the case where the notified DU beam is available) or not use it (in the case where the notified DU beam is not available) in the DU cell notified in the MAC CE.

[0049] According to the MAC CE of this embodiment, it is possible to reduce the occurrence of interference between the beam signal used in a single MT serving cell and / or MT BWP in which the backhaul link between the parent IAB node 10A and the MT102 of the IAB node 10B is set, and the beam signal used in a single DU cell in which the backhaul link or access link between the DU103 of the IAB node 10B and the MT102 of the IAB node 10C or the terminal 200 is set.

[0050] In this embodiment, the MAC CE notifies a set of DU beams from a plurality of DU cells for a single MT serving cell or MT BWP.

[0051] FIG. 4 is a diagram showing a DU beam notification according to an embodiment of the present disclosure. In the embodiment shown in FIG. 4, the MAC CE notifies a DU beam set of a plurality of DU cells for a single MT serving cell and / or an MT BWP. Specifically, the MAC CE indicates an MT serving cell ID that identifies a single MT serving cell, an MT BWP ID that identifies a single MT BWP, and a DU cell ID that identifies a plurality of DU cells, and further indicates a DU beam ID that is available or unavailable in the corresponding DU cell.

[0052] According to the illustrated MAC CE, when the MT serving cell corresponding to the "MT Serving cell ID" notified in the MAC CE from the parent IAB node 10A and / or the MT BWP corresponding to the "MT BWP ID" are used by the MT102 (IAB-MT) of the IAB node 10B, the DU103 (IAB-DU) of the IAB node 10B can or cannot use (N + 1) DU beams corresponding to "DU beam ID m_0" to "DU beam ID m_N" in each DU cell corresponding to "DU cell ID m" (in the illustrated example, 0 ≦ m ≦ M). When receiving the MAC CE from the parent IAB node 10A, if the MT102 of the IAB node 10B is using the MT serving cell and / or the MT BWP notified in the MAC CE, the DU103 of the IAB node 10B uses the notified DU beam in each DU cell notified in the MAC CE (in the case where the notified DU beam is available), or does not use it (in the case where the notified DU beam is unavailable). Note that in the illustrated example, (N + 1) DU beams are notified for each DU cell, but the beam notification according to the present disclosure is not limited to this, and different numbers of DU beams may be notified for each DU cell.

[0053] According to the MAC CE of this embodiment, it is possible to reduce the occurrence of interference between the beam signal used in a single MT serving cell and / or MT BWP in which a backhaul link is set between the parent IAB node 10A and the MT102 of the IAB node 10B, and the beam signal used in a plurality of DU cells in which a backhaul link or an access link is set between the DU103 of the IAB node 10B and the MT102 of the IAB node 10C or the terminal 200. Also, it is possible to notify whether the DU beam is available or unavailable in each of the plurality of DU cells.

[0054] In this embodiment, the MAC CE notifies a set of DU beams from a single DU cell for a single MT beam in a single MT serving cell or MT BWP.

[0055] FIG. 5 is a diagram showing DU beam notification according to an embodiment of the present disclosure. In the embodiment shown in FIG. 5, the MAC CE notifies a DU beam set of a single DU cell for a single MT beam used in a single MT serving cell and / or MT BWP. Specifically, the MAC CE indicates an MT serving cell ID that identifies a single MT serving cell, an MT BWP ID that identifies a single MT BWP, an MT beam ID that identifies a single MT beam used in the corresponding MT serving cell and / or MT BWP, and a DU cell ID that identifies a single DU cell, and further indicates a DU beam ID that is available or unavailable in the corresponding DU cell.

[0056] According to the illustrated MAC CE, when the MT beam corresponding to the "MT beam ID" in the MT serving cell corresponding to the "MT Serving cell ID" notified in the MAC CE from the parent IAB node 10A and / or the MT BWP corresponding to the "MT BWP ID" is used between the parent IAB node 10A and the MT102 (IAB-MT) of the IAB node 10B, the DU103 (IAB-DU) of the IAB node 10B is made possible or not to use (N + 1) DU beams corresponding to "DU beam ID 0" to "DU beam ID N" in the DU cell corresponding to the "DU cell ID". When receiving the MAC CE from the parent IAB node 10A, if the MT102 of the IAB node 10B is using the MT beam corresponding to the MT serving cell and / or MT BWP notified in the MAC CE, the DU103 of the IAB node 10B uses the notified DU beam in the DU cell notified in the MAC CE (in the case where the notified DU beam is available), or does not use it (in the case where the notified DU beam is unavailable).

[0057] According to the MAC CE of this embodiment, it is possible to reduce the occurrence of interference between the beam signal used in a single MT serving cell and / or MT BWP in which the backhaul link between the parent IAB node 10A and the MT102 of the IAB node 10B is set, and the beam signal used in a single DU cell in which the backhaul link or access link between the DU103 of the IAB node 10B and the MT102 of the IAB node 10C or the terminal 200 is set. Also, it is possible to notify the DU beam that is available or unavailable corresponding to each MT beam signal.

[0058] In this embodiment, the MAC CE notifies a set of DU beams from a plurality of DU cells for a single MT beam of a single MT serving cell or MT BWP.

[0059] FIG. 6 is a diagram showing DU beam notification according to an embodiment of the present disclosure. In the embodiment shown in FIG. 6, the MAC CE notifies a DU beam set of a plurality of DU cells for a single MT serving cell and / or a single MT beam used in an MT BWP. Specifically, the MAC CE indicates an MT serving cell ID that identifies a single MT serving cell, an MT BWP ID that identifies a single MT BWP, an MT beam ID that identifies a single MT beam used in the corresponding MT serving cell and / or MT BWP, and a DU cell ID that identifies a plurality of DU cells, and further indicates a DU beam ID that is available or unavailable in the corresponding DU cell.

[0060] According to the illustrated MAC CE, when the MT beam corresponding to the "MT beam ID" in the MT serving cell corresponding to the "MT Serving cell ID" notified in the MAC CE from the parent IAB node 10A and / or the MT BWP corresponding to the "MT BWP ID" is being used between the parent IAB node 10A and the MT102 (IAB-MT) of the IAB node 10B, the DU103 (IAB-DU) of the IAB node 10B can or cannot use (N + 1) DU beams corresponding to "DU beam ID m_0" to "DU beam ID m_N" in each DU cell m corresponding to the "DU cell ID m" (in the illustrated example, 0 ≦ m ≦ M). When receiving the MAC CE from the parent IAB node 10A, if the MT102 of the IAB node 10B is using the corresponding MT beam in the MT serving cell and / or MT BWP notified in the MAC CE, the DU103 of the IAB node 10B uses (in the case where the notified DU beam is available) or does not use (in the case where the notified DU beam is unavailable) the notified DU beam in each DU cell notified in the MAC CE. Note that in the illustrated example, (N + 1) DU beams are notified for each DU cell, but the beam notification according to the present disclosure is not limited to this, and different numbers of DU beams may be notified for each DU cell.

[0061] According to the MAC CE of this embodiment, it is possible to reduce the occurrence of interference between the beam signals used in a single MT serving cell and / or MT BWP in which a backhaul link is set between the parent IAB node 10A and the MT102 of the IAB node 10B, and the beam signals used in a single DU cell in which a backhaul link or an access link is set between the DU103 of the IAB node 10B and the MT102 of the IAB node 10C or the terminal 200. Also, it is possible to notify whether the DU beam is available or unavailable corresponding to each combination of each MT beam signal and each DU cell.

[0062] In this embodiment, the MAC CE notifies a plurality of sets of DU beams for a plurality of MT serving cells or MT BWPs, and a single set of DU beams for each MT serving cell or MT BWP is from a single DU cell. Note that all sets of DU beams may be from a single DU cell, and in this case, a single DU cell ID may be notified for all sets of DU beams.

[0063] FIG. 7 is a diagram showing DU beam notification according to an embodiment of the present disclosure. In the embodiment shown in FIG. 7, the MAC CE notifies a DU beam set of a single DU cell for each of a plurality of MT serving cells and / or MT BWPs. Specifically, the MAC CE indicates an MT serving cell ID that identifies a plurality of MT serving cells, an MT BWP ID that identifies a plurality of MT BWPs, and a DU cell ID that identifies a single DU cell for each MT serving cell and / or MT BWP, and further indicates a DU beam ID that is available or unavailable in the corresponding DU cell.

[0064] According to the illustrated MAC CE, when the MT serving cell l corresponding to the "MT Serving cell ID l" notified in the MAC CE from the parent IAB node 10A and / or the MT BWP l corresponding to the "MT BWP ID l" (in the illustrated example, 0 ≤ l ≤ L) are used by the MT102 (IAB-MT) of the IAB node 10B, the DU103 (IAB-DU) of the IAB node 10B is made possible or not to use (N + 1) DU beams corresponding to "DU beam ID l_0" to "DU beam ID l_N" in the DU cell corresponding to the "DU cell ID l". When receiving the MAC CE from the parent IAB node 10A, if the MT102 of the IAB node 10B is using the MT serving cell l and / or MT BWP l notified in the MAC CE, the DU103 of the IAB node 10B uses the notified DU beam in the DU cell notified (in the case where the notified DU beam is available), or does not use it (in the case where the notified DU beam is not available).

[0065] According to the MAC CE of this embodiment, it is possible to reduce the occurrence of interference between the beam signals used in each of the plurality of MT serving cells and / or MT BWPs in which the backhaul link between the parent IAB node 10A and the MT102 of the IAB node 10B is set, and the beam signals used in a single DU cell in which the backhaul link or access link between the DU103 of the IAB node 10B and the MT102 of the IAB node 10C or the terminal 200 is set. Also, it is possible to notify the DU beams that are available or not available in each single DU cell of the plurality of MT serving cells and / or MT BWPs.

[0066] In this embodiment, the MAC CE notifies a plurality of sets of DU beams for a plurality of MT serving cells or MT BWPs, and a single set of DU beams for each MT serving cell or MT BWP is from a plurality of DU cells.

[0067] FIG. 8 is a diagram showing a DU beam notification according to an embodiment of the present disclosure. In the embodiment shown in FIG. 8, the MAC CE notifies a DU beam set of a plurality of DU cells for each of a plurality of MT serving cells and / or MT BWPs. Specifically, the MAC CE indicates an MT serving cell ID that identifies a plurality of MT serving cells, an MT BWP ID that identifies a plurality of MT BWPs, and a DU cell ID that identifies a plurality of DU cells for each MT serving cell and / or MT BWP, and further indicates a DU beam ID that is available or unavailable in each corresponding DU cell.

[0068] According to the illustrated MAC CE, when an MT serving cell l corresponding to the “MT Serving cell ID l” notified in the MAC CE from the parent IAB node 10A and / or an MT BWP l corresponding to the “MT BWP ID l” (in the illustrated example, 0 ≦ l ≦ L) are used by the MT102 (IAB-MT) of the IAB node 10B, the DU103 (IAB-DU) of the IAB node 10B is enabled or disabled to use (N + 1) DU beams corresponding to “DU beam ID l_m_0” to “DU beam ID l_m_N” in each DU cell m corresponding to the “DU cell ID m” (in the illustrated example, 0 ≦ m ≦ M). When receiving the MAC CE from the parent IAB node 10A, if the MT102 of the IAB node 10B is using the MT serving cell j and / or MT BWP j notified in the MAC CE, the DU103 of the IAB node 10B uses the notified DU beam (in the case where the notified DU beam is available) or does not use it (in the case where the notified DU beam is unavailable) in each DU cell i notified in the MAC CE.

[0069] According to the MAC CE of this embodiment, it is possible to reduce the occurrence of interference between the beam signals used in each of the plurality of MT serving cells and / or MT BWPs in which a backhaul link is set between the parent IAB node 10A and the MT 102 of the IAB node 10B, and the beam signals used in the plurality of DU cells in which a backhaul link or an access link is set between the DU 103 of the IAB node 10B and the MT 102 of the IAB node 10C or the terminal 200. Also, it is possible to notify whether a DU beam is available or unavailable in each combination of each of the plurality of MT serving cells and / or MT BWPs and each of the plurality of DU cells.

[0070] In this embodiment, the MAC CE notifies a plurality of sets of DU beams for a plurality of MT beams in a single MT serving cell or MT BWP, and a single set of DU beams for each MT beam is from a single DU cell.

[0071] FIG. 9 is a diagram showing DU beam notification according to an embodiment of the present disclosure. In the embodiment shown in FIG. 9, the MAC CE notifies a DU beam set of a single DU cell for each of the plurality of MT beams used in a single MT serving cell and / or MT BWP. Specifically, the MAC CE indicates an MT serving cell ID that identifies a single MT serving cell, an MT BWP ID that identifies a single MT BWP, an MT beam ID that identifies a plurality of MT beams used in the corresponding MT serving cell and / or MT BWP, and a DU cell ID that identifies a single DU cell for each MT beam, and further indicates a DU beam ID that is available or unavailable in the corresponding DU cell.

[0072] According to the illustrated MAC CE, when the MT beams corresponding to each "MT beam ID_k" (in the illustrated example, 0 ≦ k ≦ K) are used between the parent IAB node 10A and the MT102 (IAB-MT) of the IAB node 10B in the MT serving cell corresponding to the "MT Serving cell ID" notified in the MAC CE from the parent IAB node 10A and / or the MT BWP corresponding to the "MT BWP ID", the DU103 (IAB-DU) of the IAB node 10B can or cannot use (N + 1) DU beams corresponding to "DU beam ID k_0" to "DU beam ID k_N" in the DU cell corresponding to the "DU cell ID_k". When receiving the MAC CE from the parent IAB node 10A, if the MT102 of the IAB node 10B is using the MT serving cell and / or the corresponding MT beam in the MT BWP notified in the MAC CE, the DU103 of the IAB node 10B uses the notified DU beam in the DU cell notified in the MAC CE (in the case where the notified DU beam is available), or does not use it (in the case where the notified DU beam is unavailable).

[0073] According to the MAC CE of this embodiment, it is possible to reduce the occurrence of interference between the beam signals used in a single MT serving cell and / or MT BWP in which the backhaul link between the parent IAB node 10A and the MT102 of the IAB node 10B is set, and the beam signals used in a single DU cell in which the backhaul link or access link between the DU103 of the IAB node 10B and the MT102 of the IAB node 10C or the terminal 200 is set. Also, it is possible to notify whether the DU beams are available or unavailable corresponding to each MT beam signal.

[0074] In this embodiment, the MAC CE notifies a plurality of sets of DU beams for a plurality of MT beams in a single MT serving cell or MT BWP, and a single set of DU beams for each MT beam is from a plurality of DU cells.

[0075] FIG. 10 is a diagram showing DU beam notification according to an embodiment of the present disclosure. In the embodiment shown in FIG. 10, the MAC CE notifies a DU beam set of a plurality of DU cells for each of a plurality of MT beams used in a single MT serving cell and / or an MT BWP. Specifically, the MAC CE indicates an MT serving cell ID that identifies a single MT serving cell, an MT BWP ID that identifies a single MT BWP, an MT beam ID that identifies a plurality of MT beams used in the corresponding MT serving cell and / or MT BWP, and a DU cell ID that identifies a plurality of DU cells, and further indicates a DU beam ID that is available or unavailable in the corresponding DU cell.

[0076] According to the illustrated MAC CE, when each MT beam corresponding to the "MT beam ID" in the MT serving cell corresponding to the "MT Serving cell ID" notified in the MAC CE from the parent IAB node 10A and / or the MT BWP corresponding to the "MT BWP ID" is being used between the parent IAB node 10A and the MT102 (IAB-MT) of the IAB node 10B, the DU103 (IAB-DU) of the IAB node 10B can or cannot use (N + 1) DU beams corresponding to "DU beam ID m_0" to "DU beam ID m_N" in each DU cell m corresponding to the "DU cell ID i" (in the illustrated example, 0 ≦ m ≦ M). When receiving the MAC CE from the parent IAB node 10A, if the MT102 of the IAB node 10B is using each MT beam corresponding to the MT serving cell and / or MT BWP notified in the MAC CE, the DU103 of the IAB node 10B uses (in the case where the notified DU beam is available) or does not use (in the case where the notified DU beam is unavailable) the notified DU beam in each DU cell notified in the MAC CE. Note that in the illustrated example, (N + 1) DU beams are notified for each DU cell, but the beam notification according to the present disclosure is not limited to this, and different numbers of DU beams may be notified for each DU cell.

[0077] According to the MAC CE of this embodiment, it is possible to reduce the occurrence of interference between the beam signals used in a single MT serving cell and / or MT BWP in which a backhaul link is set between the parent IAB node 10A and the MT 102 of the IAB node 10B, and the beam signals used in a single DU cell in which a backhaul link or an access link is set between the DU 103 of the IAB node 10B and the MT 102 of the IAB node 10C or the terminal 200. In addition, it is possible to notify whether a DU beam is available or unavailable corresponding to each combination of each MT beam signal and each DU cell.

[0078] In this embodiment, the MAC CE notifies a plurality of sets of DU beams for a plurality of MT beams in a plurality of MT serving cells or MT BWPs, and a single set of DU beams for each MT beam is from a single DU cell. Note that all sets of DU beams may be from a single DU cell, and in this case, a single DU cell ID is notified for all sets of DU beams. Alternatively, all sets of DU beams for a single MT serving cell or MT BWP may be from a single DU cell, and in this case, a single DU cell ID is notified for all sets of DU beams for a single MT serving cell or MT BWP.

[0079] FIG. 11 is a diagram showing DU beam notification according to an embodiment of the present disclosure. In the embodiment shown in FIG. 11, the MAC CE notifies a DU beam set of a single DU cell for each of a plurality of MT beams used in each of a plurality of MT serving cells and / or MT BWPs. Specifically, the MAC CE indicates an MT serving cell ID that identifies a plurality of MT serving cells, an MT BWP ID that identifies a plurality of MT BWPs, an MT beam ID that identifies a plurality of MT beams used in the corresponding MT serving cell and / or MT BWP, and a DU cell ID that identifies a single DU cell for each MT beam, and further indicates a DU beam ID that is available or unavailable in the corresponding DU cell.

[0080] According to the illustrated MAC CE, when the MT beam k corresponding to "MT beam ID_k" is used between the parent IAB node 10A and the MT102 (IAB-MT) of the IAB node 10B in the MT serving cell l corresponding to "MT Serving cell ID_l" notified in the MAC CE and / or the MT BWP l corresponding to "MT BWP ID_l" (in the illustrated example, 0≦k≦K), the DU103 (IAB-DU) of the IAB node 10B may or may not use (N + 1) DU beams corresponding to "DU beam ID l_k_0" to "DU beam ID l_k_N" in the DU cell l_k corresponding to "DU cell ID_l_k". When receiving the MAC CE from the parent IAB node 10A, if the MT102 of the IAB node 10B is using the corresponding MT beam in the MT serving cell and / or MT BWP notified in the MAC CE, the DU103 of the IAB node 10B uses the notified DU beam in the DU cell notified in the MAC CE (in the case where the notified DU beam is available), or does not use it (in the case where the notified DU beam is unavailable).

[0081] According to the MAC CE of this embodiment, it is possible to reduce the occurrence of interference between the beam signals used in each of the plurality of MT serving cells and / or MT BWPs in which the backhaul link between the parent IAB node 10A and the MT102 of the IAB node 10B is set, and the beam signals used in a single DU cell in which the backhaul link or access link between the DU103 of the IAB node 10B and the MT102 of the IAB node 10C or the terminal 200 is set. Also, it is possible to notify whether the DU beam is available or unavailable corresponding to each MT beam signal.

[0082] In this embodiment, the MAC CE notifies a plurality of sets of DU beams for a plurality of MT serving cells or a plurality of MT beams in an MT BWP, and a single set of DU beams for each MT beam is from a plurality of DU cells.

[0083] FIG. 12 is a diagram showing DU beam notification according to an embodiment of the present disclosure. In the embodiment shown in FIG. 12, the MAC CE notifies a DU beam set of a plurality of DU cells for each of a plurality of MT beams used in each of a plurality of MT serving cells and / or an MT BWP. Specifically, the MAC CE indicates an MT serving cell ID that identifies a plurality of MT serving cells, an MT BWP ID that identifies a plurality of MT BWPs, an MT beam ID that identifies a plurality of MT beams used in the corresponding MT serving cell and / or MT BWP, and a DU cell ID that identifies a plurality of DU cells, and further indicates a DU beam ID that is available or unavailable in the corresponding DU cell.

[0084] According to the illustrated MAC CE, when each MT beam l_k corresponding to "MT beam ID l_k" in the MT serving cell l corresponding to "MT Serving cell ID_l" notified in the MAC CE from the parent IAB node 10A and / or the MT BWP l corresponding to "MT BWP ID_l" is used between the parent IAB node 10A and the MT102 (IAB-MT) of the IAB node 10B, the DU103 (IAB-DU) of the IAB node 10B can or cannot use (N + 1) DU beams corresponding to "DU beam ID l_k_0" to "DU beam ID l_k_N" in each DU cell m corresponding to "DU cell ID l_k_m" (in the illustrated example, 0 ≤ m ≤ M). When receiving the MAC CE from the parent IAB node 10A, if the MT102 of the IAB node 10B is using the corresponding MT beams in the MT serving cell and / or MT BWP notified in the MAC CE, the DU103 of the IAB node 10B uses the notified DU beams (in the case where the notified DU beams are available) or does not use them (in the case where the notified DU beams are unavailable) in each DU cell notified in the MAC CE. In the illustrated example, (N + 1) DU beams are notified for each DU cell, but the beam notification according to the present disclosure is not limited thereto, and different numbers of DU beams may be notified for each DU cell.

[0085] According to the MAC CE of this embodiment, it is possible to reduce the occurrence of interference between the beam signal used in a single MT serving cell and / or MT BWP in which the backhaul link between the parent IAB node 10A and the MT102 of the IAB node 10B is set, and the beam signal used in a single DU cell in which the backhaul link or access link between the DU103 of the IAB node 10B and the MT102 of the IAB node 10C or the terminal 200 is set. In addition, it is possible to notify DU beams that can or cannot be used corresponding to the combination of each MT beam signal and each DU cell.

[0086] Also, in the above-described MAC CE embodiments, when the beam notification is not for each MT serving cell, the MT BWP ID field may not be present. Also, when the DU beam is either an SSB or a CSI-RS, 1 bit may be added for each DU beam to indicate whether the DU beam is an SSB or a CSI-RS. Also, the size of the DU cell ID field may be set according to the maximum number of DU cells. Also, the size of the DU beam ID field may be set according to the maximum number of DU beams from a DU cell. Also, the size of the MT serving cell ID field and / or the MT BWP ID field may be set according to the maximum number of MT serving cells and / or MT BWPs. Also, the size of the MT beam ID field may be set according to the maximum number of MT beams from an MT serving cell or an MT BWP.

[0087] Also, the number of MT serving cells, MT BWPs, MT beams, DU cells, and / or DU beams in the MAC CE may be fixed or variable. When one or more of these numbers are fixed, the number may be predefined, set, or reported as capability information (IAB capability). When one or more of these numbers are variable, the maximum number of the number may be predefined, set, or reported as capability information (IAB capability). Also, when the beam notification is for each MT serving cell group, MT BWP group, MT beam group, DU cell group, or DU beam group, the MT serving cell ID, MT BWP ID, MT beam ID, DU cell ID, or DU beam ID may be replaced with the MT serving cell group ID, MT BWP group ID, MT beam group ID, DU cell group ID, or DU beam group ID. Note that the grouping may be set by upper layer signaling.

[0088] Furthermore, in the above-described embodiments, the beam notification was transmitted by means of a MAC CE. However, the beam notification according to the present disclosure is not limited thereto, and the content notified in each of the above-described embodiments may be notified by other signaling such as RRC and DCI, information elements, and the like.

[0089] <Proposed Scheme 2> In Proposed Scheme 2, in order to support simultaneous beam notifications indicating available or unavailable DU beams across multiple MT serving cells or MT BWPs, a list of multiple MT serving cells and / or MT BWPs may be configured. This list configuration is transmitted from the parent IAB node 10A to the MT 102 of the IAB node 10B and is recognized by both the parent IAB node 10A and the IAB-MT 102.

[0090] FIG. 13 is a diagram showing a list of MT serving cells for DU beam notification according to an embodiment of the present disclosure. In the embodiment shown in FIG. 13, the list of MT serving cells is configured as component carriers (CCs) #0, #1, #2, #3 ({CC#0, #1, #2, #3}). At this time, when available or unavailable DU beams for MT serving cell #0 are notified, the same available or unavailable DU beams are automatically applied to the other MT serving cells #1, #2, #3 in the list without explicit notification.

[0091] For example, in the illustrated embodiment, when the parent IAB node 10A notifies the MT 102 of the IAB node 10B of available or unavailable DU beams #1 to #N for MT serving cell #0, the DU 103 of the IAB node 10B recognizes the available or unavailable DU beams #1 to #N for the notified MT serving cell #0 and also recognizes that the DU beams #1 to #N are available or unavailable for the other MT serving cells #1, #2, #3 in the list.

[0092] Note that in the illustrated embodiment, the list is composed of MT serving cells, but the list according to the present disclosure is not limited thereto and may be composed of MT BWPs. In this case, when the available or unavailable DU beams for one MT BWP in the list are notified from the parent IAB node 10A, the DU 103 of the IAB node 10B can recognize that the same DU beams are available or unavailable not only for the MT BWP but also for other MT BWPs in the list.

[0093] According to this embodiment, by notifying the available or unavailable DU beams for a single MT serving cell or MT BWP, the available or unavailable DU beams for other MT serving cells or MT BWPs included in the list can be recognized.

[0094] FIG. 14 is a diagram showing a list of MT serving cells for DU beam notification according to an embodiment of the present disclosure. In the embodiment shown in FIG. 14, the list of MT serving cells is set as component carriers (CCs) #0, #1, #2, #3 ({CC#0, #1, #2, #3}). At this time, when the available or unavailable DU beams for the MT beam #1 (for example, SRS resource ID = 1) of the MT serving cell #0 are notified, the same available or unavailable DU beams are autonomously applied to the MT beams #1 of the other MT serving cells #1, #2, #3 in the list without explicit notification.

[0095] For example, in the illustrated embodiment, when the parent IAB node 10A notifies the MT 102 of the IAB node 10B of the available or unavailable DU beams #1 to #N for the MT beam #1 of the MT serving cell #0, the DU 103 of the IAB node 10B recognizes the available or unavailable DU beams #1 to #N for the notified MT beam #1 of the MT serving cell #0 and also recognizes that the DU beams #1 to #N are available or unavailable for the MT beams #1 of the other MT serving cells #1, #2, #3 in the list.

[0096] In the illustrated embodiment, the list is composed of MT serving cells. However, the list according to the present disclosure is not limited thereto and may be composed of MT BWPs. In this case, when the DU beams available or unavailable for the MT beams of one MT BWP in the list are notified from the parent IAB node 10A, the DU 103 of the IAB node 10B can recognize that the same DU beams are available or unavailable not only for the MT beams of the MT BWP but also for the corresponding MT beams of other MT BWPs in the list. Also, the same or corresponding MT beams may represent the same SRS resource ID, the same CSI-RS resource ID, the same SSB index, the same TCI state ID, the same spatialRelationInfoID, the same code point of the SRI field in the DCI, or the same code point of the TCI field in the DCI.

[0097] According to this embodiment, by notifying the DU beams available or unavailable for the MT beams of a single MT serving cell or MT BWP, the DU beams available or unavailable for the corresponding MT beams of other MT serving cells or MT BWPs included in the list can be recognized.

[0098] Here, the maximum number of lists may be predefined or reported in advance as the IAB capability of the IAB node 10B. Also, the maximum number of MT serving cells or MT BWPs in each list may be predefined or reported in advance as the IAB capability of the IAB node 10B. Also, a list of multiple MT BWPs may be predefined in advance as all the BWPs of the MT serving cell.

[0099] <Proposed Scheme 3> In Proposal Scheme 3, a list of multiple DU cells may be configured to support simultaneous beam notifications indicating available or unavailable DU beams across multiple DU cells. This list configuration is sent from the parent IAB node 10A to the MT102 of the IAB node 10B and is recognized by both the parent IAB node 10A and the IAB-MT102.

[0100] FIG. 15 is a diagram showing a list of DU cells for DU beam notification according to an embodiment of the present disclosure. In the embodiment shown in FIG. 15, the list of DU cells is configured as component carriers (CCs) #0, #1, #2, #3 ({CC#0, #1, #2, #3}). At this time, when an available or unavailable DU beam for DU cell #0 is notified, the same available or unavailable DU beam is automatically applied to the other DU cells #1, #2, #3 in the list without an explicit notification.

[0101] For example, in the illustrated embodiment, when the parent IAB node 10A notifies the MT102 of the IAB node 10B of available or unavailable DU beams #1 to #N for DU cell #0, the DU103 of the IAB node 10B recognizes the available or unavailable DU beams #1 to #N for the notified DU cell #0 and also recognizes that the DU beams #1 to #N are available or unavailable for the other DU cells #1, #2, #3 in the list.

[0102] According to this embodiment, by notifying an available or unavailable DU beam for a single DU cell, it is possible to recognize available or unavailable DU beams for other DU cells included in the list.

[0103] Here, the maximum number of lists may be predefined or reported as the IAB capability of the IAB node 10B. Also, the maximum number of DU cells in each list may be predefined or reported as the IAB capability of the IAB node 10B. Further, when the DU beam of the DU cell in the list is notified as an available or unavailable DU beam, the same DU beam of all DU cells in the list may be regarded as an available or unavailable beam. Note that the same DU beam may represent the same SRS resource ID, the same CSI-RS resource ID, or the same SSB index.

[0104] <Combination of Proposal Schemes 1 to 3> Two or more of the above-described proposal schemes 1 to 3 may be combined. For example, both proposal scheme 1 and 2 may be supported and used together. Also, when the beam notification according to proposal scheme 1 is transmitted by MAC CE, RRC, and / or DCI, the content of the beam notification may be applied to all MT serving cells, all MT BWPs, and / or all DU cells in the list according to proposal scheme 2 and / or 3.

[0105] <IAB capability> For the IAB node 10, the following IAB capability and / or upper layer signaling may be set. · Whether the parent IAB node supports notifying available or unavailable DU beams of the IAB-DU · Whether it supports simultaneous notification of available or unavailable DU beams across multiple MT serving cells or MT BWPs (if supported, the maximum number of lists, the maximum number of MT serving cells or MT BWPs in the list, etc.) · Whether it supports simultaneous notification of available or unavailable DU beams across multiple DU cells (if supported, the maximum number of lists, the maximum number of DU cells in the list, etc.) When the corresponding capability information is supported and / or enabled by the corresponding upper layer signaling, the proposed scheme described above may be applied.

[0106] (Device Configuration) Next, a functional configuration example of the wireless communication node 10 and the terminal 20 that perform the processes and operations described so far will be described. The wireless communication node 10 and the terminal 20 include functions for implementing the above-described embodiments. However, the wireless communication node 10 and the terminal 20 may each be provided with only some of the functions in the embodiments.

[0107] <Wireless Communication Node 10> FIG. 16 is a diagram showing an example of the functional configuration of the wireless communication node 10. As shown in FIG. 16, the wireless communication node 10 includes a transmission unit 11, a reception unit 12, a setting unit 13, and a control unit 14. The functional configuration shown in FIG. 16 is merely an example. As long as the operations according to the embodiments of the present invention can be performed, the functional division and the names of the functional units may be any.

[0108] The transmission unit 11 includes a function of generating a signal to be transmitted to the terminal 20 or another wireless communication node 10 and transmitting the signal by wire or wirelessly. The reception unit 12 includes a function of receiving various signals transmitted from the terminal 20 or another wireless communication node 10 and acquiring information of a higher layer, for example, from the received signals.

[0109] The setting unit 13 stores preset setting information and various setting information to be transmitted to another wireless communication node 10 or the terminal 20 in a storage device and reads it out from the storage device as necessary. The content of the setting information may include, for example, various information for IAB.

[0110] The control unit 14 controls the wireless link with the upper node and the wireless link with the lower node for IAB as described in the embodiments. In addition, the control unit 14 performs processes related to communication with the terminal 20. A functional unit related to signal transmission in the control unit 14 may be included in the transmission unit 11, and a functional unit related to signal reception in the control unit 14 may be included in the reception unit 12.

[0111] <Terminal 20> FIG. 17 is a diagram showing an example of the functional configuration of the terminal 20. As shown in FIG. 17, the terminal 20 includes a transmission unit 21, a reception unit 22, a setting unit 23, and a control unit 24. The functional configuration shown in FIG. 17 is merely an example. As long as the operations according to the embodiments of the present invention can be implemented, the functional divisions and the names of the functional units can be anything.

[0112] The transmission unit 21 creates a transmission signal from the transmission data and wirelessly transmits the transmission signal. The reception unit 22 wirelessly receives various signals and obtains signals of a higher layer from the received physical layer signals. Further, the reception unit 22 has a function of receiving NR-PSS, NR-SSS, NR-PBCH, DL / UL control signals, reference signals, etc. transmitted from another wireless communication node 10 or the terminal 20.

[0113] The setting unit 23 stores various setting information received from another wireless communication node 10 or the terminal 20 by the reception unit 22 in the storage device and reads it out from the storage device as necessary. Further, the setting unit 23 also stores preset setting information. The content of the setting information may include, for example, various information for IAB.

[0114] The control unit 24 controls the wireless link with the upper node and the wireless link with the lower node for IAB as described in the embodiments. The functional unit related to signal transmission in the control unit 24 may be included in the transmission unit 21, and the functional unit related to signal reception in the control unit 24 may be included in the reception unit 22.

[0115] (Hardware Configuration) Note that the block diagrams used in the description of the above embodiments show blocks of functional units. These functional blocks (components) are realized by any combination of at least one of hardware and software. Also, the method of realizing 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 (e.g., 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.

[0116] Functions include, but are not limited to, judgment, decision, determination, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, solution, selection, selection, establishment, comparison, assumption, expectation, regarded as, notification (broadcasting), notification (notifying), communication (communicating), forwarding, configuration (configuring), reconfiguration (reconfiguring), allocation (allocating, mapping), assignment (assigning), etc. For example, a functional block (component) that functions as transmission is called a transmitting unit or a transmitter. In any case, as described above, the realization method is not particularly limited.

[0117] For example, an IAB node, a terminal, etc. in an embodiment of the present disclosure may function as a computer that performs the processing of the wireless communication method of the present disclosure. FIG. 18 is a diagram showing an example of the hardware configuration of an IAB node and a terminal according to an embodiment of the present disclosure. The above-described IAB node 10 and terminal 20 may physically 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, and the like.

[0118] In the following description, the term "device" can be read as a circuit, a device, a unit, etc. The hardware configuration of the IAB node 10 and the terminal 20 may be configured to include one or more of each device shown in the figure, or may be configured without including some devices.

[0119] Each function in the IAB node 10 and the terminal 20 is realized by loading a predetermined software (program) 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.

[0120] The processor 1001 controls the entire computer by operating an operating system, for example. The processor 1001 may be constituted by a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, a register, etc. For example, the above-described control unit 100, CU 101, MT 102, DU 103, etc. may be realized by the processor 1001.

[0121] Also, the processor 1001 reads a program (program code), 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. For example, the control unit of the terminal 20 may be realized by a control program stored in the memory 1002 and operating in the processor 1001, and other functional blocks may be realized in the same way. Although it has been described that the above various processes are executed by one processor 1001, they 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.

[0122] The memory 1002 is a computer-readable recording medium and may be constituted by at least one of, for example, ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electrically Erasable Programmable ROM), RAM (Random Access Memory), etc. The memory 1002 may be referred to as a register, cache, main memory (main storage device), etc. The memory 1002 can store a program (program code), software module, etc. executable for implementing the wireless communication method according to an embodiment of the present disclosure.

[0123] Storage 1003 is a computer-readable recording medium and may be composed of, for example, at least one of an optical disc such as a CD-ROM (Compact Disc 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. Storage 1003 may be referred to as an auxiliary storage device. The above-described storage 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.

[0124] 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. The communication device 1004 may be configured to include, for example, a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. in order to implement at least one of frequency division duplex (FDD: Frequency Division Duplex) and time division duplex (TDD: Time Division Duplex). For example, an antenna included in the IAB node 10 and the terminal 20 may be realized by the communication device 1004.

[0125] 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 an external input. The output device 1006 is an output device (e.g., 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 (e.g., a touch panel).

[0126] In addition, 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.

[0127] In addition, 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. In addition, 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.

[0128] (Summary of Embodiment) As described above, according to the embodiment of the present invention, there is provided a wireless communication node including a control unit that controls a first wireless link with a higher-level node and a second wireless link with a lower-level node, and a reception unit that receives from the higher-level node a beam notification indicating a beam that is available or unavailable in the second wireless link with respect to a wireless resource used in the first wireless link.

[0129] According to the above configuration, in wireless communication by IAB, it is possible to reduce the occurrence of interference between a beam signal used in one or more MT serving cells and / or MT BWP (radio resources) in which a backhaul link is set between the parent IAB node 10A and the MT102 of the IAB node 10B, and a beam signal used in one or more DU cells in which a backhaul link or an access link is set between the DU103 of the IAB node 10B and the MT102 of the IAB node 10C or the terminal 200.

[0130] In one embodiment, the beam notification may indicate beams that are available or unavailable in one or more cells provided by the lower node for one or more serving cells or bandwidth parts (BWPs) provided by the upper node. According to this embodiment, the parent IAB node can notify the DU beams that are available or unavailable in one or more DU cells for one or more MT serving cells or BWPs.

[0131] In one embodiment, the beam notification may indicate beams that are available or unavailable in one or more cells provided by the lower node for one or more beams in one or more serving cells or bandwidth parts (MT BWPs) provided by the upper node. According to this embodiment, the parent IAB node can notify the DU beams that are available or unavailable in one or more DU cells for one or more MT beams of one or more MT serving cells or MT BWPs.

[0132] In one embodiment, the receiving unit may receive a list of a plurality of serving cells or bandwidth parts (BWPs) provided by the upper node. According to this embodiment, by notifying the available or unavailable DU beams for one MT serving cell or MT BWP, the available or unavailable DU beams for other MT serving cells or MT BWPs in the list can be set.

[0133] In one embodiment, the receiving unit may receive a list of a plurality of cells provided by the lower node. According to this embodiment, by notifying the available or unavailable DU beams for one DU cell, the available or unavailable DU beams for other DU cells in the list can be set.

[0134] According to another embodiment of the present invention, there is provided a wireless communication method executed by a wireless communication node, the method including: controlling a first wireless link with a higher-level node and a second wireless link with a lower-level node; and receiving, from the higher-level node, a beam notification indicating a beam that is available or unavailable in the second wireless link with respect to a wireless resource used in the first wireless link.

[0135] According to the above configuration, in wireless communication using IAB, it is possible to reduce the occurrence of interference between a beam signal used in one or more MT serving cells and / or MT BWP (radio resources) in which a backhaul link is set between the parent IAB node 10A and the MT 102 of the IAB node 10B, and a beam signal used in one or more DU cells in which a backhaul link or an access link is set between the DU 103 of the IAB node 10B and the MT 102 of the IAB node 10C or the terminal 200.

[0136] (Supplement of the embodiment) Although the embodiments of the present invention have been described above, the disclosed invention is not limited to such embodiments, and those skilled in the art will understand various variations, modifications, alternatives, substitutions, etc. Specific numerical examples have been used for the purpose of facilitating the understanding of the invention, but unless otherwise specified, these numerical values are merely examples, and any appropriate values may be used. The classification of items in the above description is not essential to the present invention, and the matters described in two or more items may be used in combination as necessary, or the matters described in one item may be applied to the matters described in another item (as long as there is no contradiction). The boundaries of the functional units or processing units in the functional block diagram do not necessarily correspond to the boundaries of physical components. The operations of multiple functional units may be physically performed by one component, or the operation of one functional unit may be physically performed by multiple components. Regarding the processing procedures described in the embodiments, the order of processing may be changed as long as there is no contradiction. For the convenience of processing explanation, the wireless communication node 10 and the terminal 20 have been described using functional block diagrams, but such devices may be implemented in hardware, software, or a combination thereof. The software operated by the processor included in the wireless communication node 10 according to the embodiments of the present invention and the software operated by the processor included in the terminal 20 according to the embodiments of the present invention may be stored in a random access memory (RAM), flash memory, read-only memory (ROM), EPROM, EEPROM, register, hard disk drive (HDD), removable disk, CD-ROM, database, server, or any other appropriate storage medium, respectively.

[0137] (Notification of Information, Signaling) 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., DCI (Downlink Control Information), UCI (Uplink Control Information)), upper layer signaling (e.g., RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling, notification information (MIB (Master Information Block), SIB (System Information Block))), other signals or combinations thereof. Also, the RRC signaling may be called an RRC message, and may be, for example, an RRC connection setup (RRC Connection Setup) message, an RRC connection reconfiguration (RRC Connection Reconfiguration) message, etc.

[0138] (Applicable system) Each aspect / embodiment described in the present disclosure may be applied to at least one of systems using LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system), FRA (Future Radio Access), NR (New Radio), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, UWB (Ultra-WideBand), Bluetooth (registered trademark), and other suitable systems, and next-generation systems extended based on these. Further, multiple systems may be combined (for example, a combination of at least one of LTE and LTE-A and 5G, etc.) and applied.

[0139] (Processing procedures, etc.) The processing procedures, sequences, flowcharts, etc. of each aspect / embodiment described in the present disclosure may be reordered as long as there is no contradiction. For example, for the methods described in the present disclosure, the elements of various steps are presented using an exemplary order and are not limited to the specific order presented.

[0140] (Operation of IAB node) Certain operations assumed to be performed by an IAB node in the present disclosure may, in some cases, be performed by its upper node. In a network consisting of one or more network nodes having IAB nodes, various operations performed for communication with a terminal can clearly be performed by at least one of the IAB node and other network nodes other than the IAB node (for example, but not limited to, an MME or an S-GW). Although the case where there is one other network node other than the IAB node has been exemplified above, a combination of a plurality of other network nodes (for example, an MME and an S-GW) may also be possible.

[0141] (Input / output direction) Information, etc. (see the item "Information, Signal") can be output from an upper layer (or a lower layer) to a lower layer (or an upper layer). It may be input / output via a plurality of network nodes.

[0142] (Handling of input / output information, etc.) The input / output information, etc. may be stored in a specific location (for example, a memory) or may be managed using a management table. The input / output information, etc. can be overwritten, updated, or appended. The output information, etc. may be deleted. The input information, etc. may be transmitted to other devices.

[0143] (Judgment method) The judgment may be made by a value represented by 1 bit (0 or 1), may be made by a Boolean value (true or false), or may be made by a numerical comparison (for example, comparison with a predetermined value).

[0144] (Software) Software should 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, execution threads, procedures, functions, etc., whether called software, firmware, middleware, microcode, a hardware description language, or by any other name.

[0145] 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, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and wireless technologies (such as infrared, microwave, etc.), at least one of these wired and wireless technologies is included within the definition of a transmission medium.

[0146] (Information, signal) The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, the data, instructions, commands, information, signals, bits, symbols, chips, etc. that 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.

[0147] Note that for the terms described in this disclosure and terms necessary for understanding this disclosure, they may be replaced with terms having the same or similar meaning. For example, at least one of channel and symbol may be a signal (signaling). Also, a signal may be a message. Also, a Component Carrier (CC) may be called a carrier frequency, a cell, a frequency carrier, etc.

[0148] ("System", "network") The terms "system" and "network" used in this disclosure are used interchangeably.

[0149] (Parameter, channel name) Also, the information, parameters, etc. described in this disclosure may be represented using absolute values, relative values from a predetermined value, or using corresponding other information. For example, wireless resources may be indicated by an index.

[0150] The names used for the above-described parameters are not limiting names in any way. Furthermore, mathematical formulas, etc. using these parameters may be different from those explicitly disclosed in this disclosure. Since various channels (e.g., PUCCH, PDCCH, etc.) and information elements can be identified by any suitable name, the various names assigned to these various channels and information elements are not limiting names in any way.

[0151] (Base station (radio base station)) In this disclosure, an IAB node has the functions of a base station. Terms such as "base station (BS:Base Station)", "radio base station", "fixed station", "NodeB", "eNodeB (eNB)", "gNodeB (gNB)", "access point", "transmission point", "reception point", "transmission / reception point", "cell", "sector", "cell group", "carrier", "component carrier", etc. may be used interchangeably. The base station may also be referred to by terms such as macrocell, small cell, femtocell, picocell, etc.

[0152] The base station can accommodate one or more (e.g., three) cells. When the 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 (RRH: Remote Radio Head)). 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 in this coverage.

[0153] (Terminal) In the present disclosure, terms such as "mobile station (MS)", "user terminal", "user equipment (UE)", and "terminal" can be used interchangeably.

[0154] The mobile station may also be called 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 appropriate terms.

[0155] (IAB Node / Mobile Station) At least one of the IAB node and the mobile station may be called a transmission device, a reception device, a communication device, etc. Note that at least one of the IAB node 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 without a driver (e.g., a drone, an autonomous vehicle, etc.), or a robot (humanoid or non-humanoid). Note that at least one of the IAB node and the mobile station also includes a device that does not necessarily move during the communication operation. For example, at least one of the IAB node and the mobile station may be an IoT (Internet of Things) device such as a sensor.

[0156] Also, the IAB node in the present disclosure may be read and replaced by a user terminal. For example, for a configuration in which the communication between the IAB node and the user terminal is replaced with communication between a plurality of user terminals (which may be referred to as, for example, D2D (Device-to-Device), V2X (Vehicle-to-Everything), etc.), each aspect / embodiment of the present disclosure may be applied. In this case, the functions of the above-described IAB node 10 may be the configuration of the terminal 20. Also, terms such as "up" and "down" may be read and replaced with terms corresponding to inter-terminal communication (for example, "side"). For example, an uplink channel, a downlink channel, etc. may be read and replaced with a side channel.

[0157] Similarly, the terminal in the present disclosure may be read and replaced by an IAB node. In this case, the functions of the above-described terminal 20 may be the configuration of the IAB node 10.

[0158] (Meaning and Interpretation of Terms) 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 (e.g., searching in a table, database, or another data structure), ascertaining, and considering something as having been "determined" or "decided". Additionally, "determining" and "deciding" may include considering something as having been "determined" or "decided" based on receiving (e.g., receiving information), transmitting (e.g., transmitting information), inputting, outputting, accessing (e.g., accessing data in memory), etc. Further, "determining" and "deciding" may include considering something as having been "determined" or "decided" based on resolving, selecting, choosing, establishing, comparing, etc. 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.

[0159] 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 that are "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, by way of 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, etc.

[0160] (Reference Signal) The reference signal can also be abbreviated as RS (Reference Signal) and may be called a Pilot depending on the applicable standard.

[0161] (Meaning of "based on") 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."

[0162] ( "First," "Second") Any reference to an element using designations such as "first," "second," etc. used in this disclosure does not generally limit the quantity or order of those elements. These designations can 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, or that the first element must precede the second element in any form.

[0163] (Means) In the configurations of each of the above devices, the "section" may be replaced with "means", "circuit", "device", etc.

[0164] (Open format) In the present disclosure, when the terms "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 the present disclosure is not intended to be an exclusive disjunction.

[0165] (Time units such as TTI, frequency units such as RB, radio frame configuration) A radio 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.

[0166] Numerology may be a communication parameter applied to at least one of transmission and reception of a certain signal or channel. Numerology may indicate at least one of, for example, subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio 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.

[0167] A slot may be composed of one or more symbols (such as OFDM (Orthogonal Frequency Division Multiplexing) symbols, SC-FDMA (Single Carrier Frequency Division Multiple Access) symbols, etc.) in the time domain. A slot may be a time unit based on a numerology.

[0168] A slot may include a plurality of mini-slots. Each mini-slot may be composed of one or more symbols in the time domain. Also, a mini-slot may be called a sub-slot. A mini-slot may be composed of a smaller number of symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a mini-slot may be called a PDSCH (or PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot may be called a PDSCH (or PUSCH) mapping type B.

[0169] A radio frame, a sub-frame, a slot, a mini-slot, and a symbol all represent time units for signal transmission. Different names corresponding to each of them may be used.

[0170] 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 a sub-frame (1 ms) in 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.

[0171] Here, TTI refers to, for example, the minimum time unit of scheduling in wireless communication. For example, in an LTE system, an IAB node 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 TTI is not limited to this.

[0172] TTI may be a transmission time unit such as a channel-coded data packet (transport block), code block, codeword, etc., or may be a processing unit such as scheduling and link adaptation. Note that when TTI is given, the time interval (e.g., the number of symbols) in which a transport block, code block, codeword, etc. are actually mapped may be shorter than the TTI.

[0173] Note that when one slot or one mini-slot is called TTI, one or more TTIs (i.e., one or more slots or one or more mini-slots) may be the minimum time unit of scheduling. Also, the number of slots (mini-slot number) constituting the minimum time unit of the scheduling may be controlled.

[0174] A TTI having a time length of 1 ms may be called a normal TTI (TTI in LTE Rel.8 - 12), normal TTI, long TTI, normal subframe, normal subframe, long subframe, slot, etc. A TTI shorter than the normal TTI may be called a shortened TTI, short TTI, partial TTI (partial or fractional TTI), shortened subframe, short subframe, mini-slot, sub-slot, slot, etc.

[0175] Note that a long TTI (e.g., a normal TTI, 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.

[0176] 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 an RB may be the same regardless of the numerology, for example, it may be 12. The number of subcarriers included in an RB may be determined based on the numerology.

[0177] Also, the time domain of an 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.

[0178] 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.

[0179] Also, a resource block may be composed of one or more resource elements (REs). For example, 1 RE may be a radio resource area of 1 subcarrier and 1 symbol.

[0180] A bandwidth part (BWP) (which may also be called a partial bandwidth, etc.) may represent a subset of consecutive common resource blocks (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. A PRB is defined in a certain BWP and may be numbered within that BWP.

[0181] The BWP may include a BWP for UL (UL BWP) and a BWP for DL (DL BWP). One or more BWPs may be configured within one carrier for a terminal.

[0182] At least one of the configured BWPs may be active, and the terminal 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".

[0183] The structures such as the radio frames, subframes, slots, minislots, and symbols described above 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, and the number of symbols, symbol length, cyclic prefix (CP) length, etc. within a TTI can be changed in various ways.

[0184] In the present disclosure, for example, when an article is added by translation, such as a, an, and the in English, the present disclosure may include that the noun following these articles is in the plural form.

[0185] In the present disclosure, the term "A and B are different" may mean "A and B are different from each other". Note that the term may also mean "A and B are different from C respectively". Terms such as "separate", "coupled", etc. may also be interpreted in the same way as "different".

[0186] (Variations of aspects, etc.) Each aspect / embodiment described in the present disclosure may be used alone, in combination, or switched and used during execution. Also, 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).

[0187] 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 as modifications and variations without departing from the spirit and scope of the present disclosure defined by the claims. Therefore, the description of the present disclosure is for illustrative purposes and has no restrictive meaning for the present disclosure.

Explanation of Reference Numerals

[0188] 10, 10A, 10B, 10C IAB Node 20 Terminal 100 Control Unit 101 CU (Central Unit) 102 MT (Mobile-Termination) 103 DU (Distributed Unit)

Claims

1. a receiving unit that receives, via a medium access control-control element (MAC CE), a beam notification including: a plurality of first fields related to a first beam restricted for use in a distributed unit (DU); a plurality of second fields related to a mobile termination (MT) serving cell and a DU cell associated with the first beam; and a plurality of third fields related to a second beam used in the MT associated with the first beam; a control unit that controls communication using the beam notification; A wireless communication node comprising the above.

2. The first field includes, as information related to the first beam, a synchronization signal block (SSB) index or a Channel State Information-Reference Signal (CSI-RS) index. The wireless communication node according to Claim 1.

3. The beam notification includes a fourth field indicating which of the SSB index and the CSI-RS index is included in the first field. The wireless communication node according to Claim 2.

4. The third field includes, as information related to the second beam, a synchronization signal block (SSB) ID, a channel state information-reference signal (CSI-RS) index, a transmission configuration indicator (TCI) state ID, or a sounding reference signal resource indicator (SRI). The wireless communication node according to Claim 1.

5. The wireless communication node is A beam notification including: a plurality of first fields related to a first beam restricted for use in a distributed unit (DU); a plurality of second fields related to a mobile termination (MT) serving cell and a DU cell associated with the first beam; and a plurality of third fields related to a second beam used in the MT associated with the first beam, is received via a medium access control-control element (MAC CE), communication is controlled using the beam notification, communication method.

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