Wireless communication nodes

Abstract

A wireless communication node (100B) receives setting information related to wireless resources at least for lower-level nodes from a parent node or a central device.

Description

Technical Field

[0001] The present disclosure relates to setting up dual connectivity in a wireless communication node for wireless access and wireless backhaul. Background Art

[0002] The 3rd Generation Partnership Project (3GPP) has standardized the 5th generation mobile communication system (also known as 5G, New Radio (NR) or Next Generation (NG)), and is also promoting the standardization of the next generation known as Beyond5G, 5G Evolution or 6G.

[0003] For example, in the NR radio access network (RAN), research is underway on integrated access and backhaul (IAB), which combines radio access to terminals (User Equipment: UE) and radio backhaul between wireless communication nodes such as gNBs.

[0004] In IAB, an IAB node has a mobile terminal (MT) function for connecting to an upper node such as a parent node or IAB donor CU (Central Unit), and a distributed unit (DU) function for connecting to a lower node such as a child node or UE.

[0005] In 3GPP Release 16, half-duplex communication and time division multiplexing (TDM) are now the prerequisites for wireless access and wireless backhaul. Furthermore, in Release 17, simultaneous operation of the mobile equipment (MT) and the data unit (DU) (simultaneous Tx / Rx) is being studied, along with the application of frequency division multiplexing (FDM), space division multiplexing (SDM), and full-duplex communication.

[0006] In addition, due to limitations such as half-duplex communication between the MT and the DU, a method for managing resources between the MT and the DU is under study (Non-Patent Document 1).

[0007] In addition, in order to set up dual connectivity (DC) of the wireless link with the parent node, the use of the NR DC framework (MCG / SCG association procedure, etc.) is considered (Non-Patent Document 2).

[0008] Prior art literature

[0009] Non-patent literature

[0010] Non-Patent Document 1: 3GPP TS 38.213 V16.1.0, 3rd Generation Partnership Project; Technical Specification Group Radio Access Network; NR; Physical layer procedures for control (Release 16), 3GPP, March 2020

[0011] Non-Patent Document 2: 3GPP TS 37.340 V15.6.0, 3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA) and NR; Multi-connectivity; Stage 2 (Release 15), 3GPP, June 2019 Summary of the Invention

[0012] Here, when the MT and DU want to achieve dual connectivity with multiple parent nodes, resource management becomes more complicated due to limitations such as half-duplex communication that exist between the MT and DU.

[0013] Therefore, the following disclosure is made in view of such a situation, and its purpose is to provide a wireless communication node that can achieve appropriate resource management in MT and DU when implementing dual connection with the parent node in integrated access and backhaul (IAB).

[0014] One embodiment of the present disclosure is a wireless communication node (wireless communication node 100B), which has: a connection unit (upper node connection unit 170, lower node connection unit 180), which is used for dual connection (dual connection) with multiple parent nodes (parent nodes 100A-1, 2) and connection with one or more lower nodes (child nodes 100C) that can share wireless resources; and a receiving unit (wireless receiving unit 162) that receives setting information related to wireless resources at least for lower nodes from the parent node (parent node 100A) or the central unit (CU 50). BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a diagram schematically illustrating the overall configuration of the wireless communication system 10 .

[0016] Figure 2 This is a diagram showing a basic configuration example of IAB.

[0017] Figure 3 This is a diagram showing the relationship between frequency overlap in TDM.

[0018] Figure 4 This is a functional block diagram of the parent node 100A.

[0019] Figure 5 FIG. 1 is a functional block diagram of the IAB node 100B constituting the IAB node.

[0020] Figure 6 This is a diagram showing a control sequence of Operation Example 1 in the present embodiment.

[0021] Figure 7 1 is a diagram showing an example of resource setting information provided from the IAB donor CU 50 .

[0022] Figure 8 This is a diagram showing an example of a different semi-static DU configuration set for each parent node 100A.

[0023] Figure 9 This is a diagram showing an example of the control sequence of Action Example 2-1-1.

[0024] Figure 10 This is a diagram showing the correspondence between the AI index field value and the indication content (indication) of DCI format 2_5.

[0025] Figure 11 This is a diagram showing the relationship between explicit or implicit indications from MCG and SCG and the availability of DU resources.

[0026] Figure 121 and 2 are diagrams showing an example of an operation in which the IAB donor CU 50 transmits resource setting information of a child node to the parent nodes 100A- 1 and 100A- 2 .

[0027] Figure 13 This is a diagram for explaining one possible solution to support action example 1-1.

[0028] Figure 14 100 is a diagram showing an example of the hardware configuration of the CU 50 , the wireless communication nodes 100A to 100C, and the UE 200 . DETAILED DESCRIPTION

[0029] Hereinafter, the embodiment will be described with reference to the accompanying drawings. In addition, the same or similar reference numerals are given to the same functions and structures, and their descriptions are omitted as appropriate.

[0030] (1) Overall schematic structure of wireless communication system

[0031] Figure 1 This is a diagram schematically illustrating the overall configuration of a wireless communication system 10 according to this embodiment. The wireless communication system 10 is a wireless communication system compliant with 5G New Radio (NR), and is composed of a plurality of wireless communication nodes and terminals.

[0032] Specifically, the wireless communication system 10 includes a central unit 50 (hereinafter referred to as CU 50 ), wireless communication nodes (including a parent node 100A, an IAB node 100B, and a subordinate node 100C), and a user terminal 200 (hereinafter referred to as UE 200 ).

[0033] The wireless communication nodes 100A, 100B, and 100C are capable of establishing wireless access with the UE 200 and establishing a wireless backhaul (BH) between the wireless communication nodes. Specifically, backhauls (transmission paths) based on wireless links are established between the parent node 100A and the IAB node 100B, and between the IAB node 100B and the lower node 100C.

[0034] In this way, the structure in which "radio access to the UE 200" and "radio backhaul between the radio communication nodes" are integrated is called Integrated Access and Backhaul (IAB).

[0035] IAB reuses existing functions and interfaces defined for radio access. Specifically, the Mobile Terminal (MT), gNB-Distributed Unit (gNB-DU), gNB-Central Unit (gNB-CU), User Plane Function (UPF), Access and Mobility Management Function (AMF), and Session Management Function (SMF), along with corresponding interfaces such as NR Uu (between MT and gNB / DU), F1, NG, X2, and N4, are used as a baseline.

[0036] The parent node 100A is connected to the NR's network access network (NG-RAN) and core network (Next Generation Core (NGC: Next Generation Core) or 5GC) via a wired transmission path such as optical fiber transmission. The NG-RAN / NGC includes a centralized unit 50 (CU 50) as a communication node. In addition, it can also be simply expressed as "network" including NG-RAN and NGC. The number of parent nodes 100A is not limited to 2, but in this embodiment, in order to illustrate the case where dual connection (DC) is implemented, one parent node is sometimes referred to as parent node 100A-1 and the other parent node is sometimes referred to as parent node 100A-2. Here, the parent nodes 100A-1 and 2 can be classified into a group of cells formed by the main wireless base station, namely, a main cell group (MCG: Master Cell Group) and a group of cells formed by the secondary wireless base station, namely, a secondary cell group (SCG: Secondary Cell Group).

[0037] The IAB node 100B is connected to the NR network access network (NG-RAN) and the core network (NGC or 5GC) via a wired transmission path such as optical fiber transmission. The NG-RAN / NGC includes a communication node, namely the CU 50. In addition, Figure 1 As shown, the IAB node 100B can simultaneously connect to multiple parent nodes 100A via dual connectivity (DC). Specifically, in this embodiment, the technology previously defined as dual connectivity (DC) in the radio access link in the 3rd Generation Partnership Project (3GPP) can be used for DC in the radio backhaul (see Non-Patent Document 2).

[0038] CU 50 may also be composed of any one or a combination of the aforementioned UPF, AMF, and SMF. Alternatively, CU 50 may also be a gNB-CU as described above. Furthermore, in the IAB, CU 50 may also be specifically referred to as an IAB donor CU.

[0039] Figure 2 : is a diagram showing an example of the basic structure of IAB. Figure 2 As shown, in this embodiment, wireless communication node 100A constitutes a parent node in the IAB, wireless communication node 100B constitutes an IAB node in the IAB, and wireless communication node 100C constitutes a child node in the IAB. Furthermore, in this embodiment, child node 100C is illustrated as a separate housing from UE 200. However, lower-level nodes may include UE 200 in addition to child nodes. Therefore, in this embodiment, child node 100C may also be used in place of UE 200.

[0040] Furthermore, the parent node can be referred to as an upper-level node in its relationship with the IAB node. Therefore, in this embodiment, the parent node can be replaced with an upper-level node, and the upper-level node can be replaced with a parent node. Furthermore, in addition to the parent node 100A, the upper-level node can also include the IAB donor CU 50. Furthermore, the IAB node 100B can be referred to as a child node or a lower-level node in its relationship with the parent node 100A.

[0041] As described above, a child node or lower-level node in the IAB can also be a UE 200. Therefore, in this embodiment, a child node can be replaced with a lower-level node, and a lower-level node can be replaced with a child node. The IAB node 100B can be referred to as a parent node or an upper-level node in its relationship with the child node, and the child node 100C can be referred to as a child node or a lower-level node in its relationship with the IAB node 100B.

[0042] A wireless link is established between the parent node and the IAB node. Specifically, a wireless link called Link_parent is established.

[0043] A wireless link is established between the IAB node and the child node. Specifically, a wireless link called Link_child is established.

[0044] The wireless link established between these wireless communication nodes is called a wireless backhaul link. Link_parent consists of a downlink "DL Parent Backhaul (DL Parent BH)" and an uplink "UL Parent Backhaul (UL Parent BH)." Link_child consists of a downlink "DL Child Backhaul (DL Child BH)" and an uplink "UL Child Backhaul (UL Child BH).

[0045] In addition, the radio link established between the UE 200 and the IAB node or parent node is called a radio access link. Specifically, the radio link is composed of a downlink DL access (DL Access) and an uplink UL access (UL Access).

[0046] In this embodiment, the wireless backhaul link and the wireless access link can share wireless resources due to limitations such as half-duplex communication, so resource segmentation technologies such as time division multiplexing (TDM), frequency division multiplexing (FDM), and space division multiplexing (SDM) are required.

[0047] The IAB node has a function for connecting to an upper node such as a parent node, namely a mobile terminal (MT) and a function for connecting to a lower node such as a child node or UE 200, namely a distributed unit (DU). Figure 2 Omitted in , but the parent node and child node also have MT and DU (refer to Figure 1 ).

[0048] The radio resources used by the DU include downlink (DL), uplink (UL), and flexible resources (D / U / F) from the DU's perspective. These radio resources are categorized as "Hard," "Soft," or "Not Available" (H / S / NA). Within the Soft (S) category, "Available" or "Not Available" is also specified.

[0049] Flexible resources (F) are resources that can be used in either DL or UL.

[0050] Furthermore, "Hard" indicates that the corresponding radio resource can always be used as a radio resource for a DU child link connected to a lower node such as a child node or UE, i.e., it indicates that the radio resource is designated as dedicated to the lower node. On the other hand, "Soft" indicates that whether the corresponding radio resource can be used as a DU child link is explicitly or implicitly controlled by an upper node such as a parent node or CU, i.e., it indicates that the radio resource is not designated as dedicated to the lower node. In addition, a radio resource for a lower node set to Soft is sometimes referred to as a DU soft resource.

[0051] Therefore, as a DU resource, any of DL-H, DL-S, UL-H, UL-S, FH, FS, or NA is set.

[0052] in addition, Figure 2 The example IAB structure shown is based on CU / DU splitting, but the IAB structure is not necessarily limited to this. For example, in wireless backhaul, the IAB can be constructed using a tunnel using the GPRS Tunneling Protocol (GTP)-U / User Datagram Protocol (UDP) / Internet Protocol (IP).

[0053] The main advantage of IAB is the ability to flexibly and densely configure NR cells without densifying the transmission network. IAB can be applied to various scenarios, including outdoor small cell configuration, indoor and mobile relay station support (for example, in buses and trains).

[0054] In addition, if Figure 1 and Figure 2 As shown, IAB can support extensions based on standalone (SA) based on NR only or non-standalone (NSA) based on extensions including other RATs (LTE, etc.).

[0055] In this embodiment, wireless access and wireless backhaul operate based on half-duplex communication. However, this is not necessarily limited to half-duplex communication. Full-duplex communication, such as simultaneous communication (Tx and / or Rx) between the MT and DU, is also possible as long as the requirements are met.

[0056] In addition, multiplexing methods can use time division multiplexing (TDM), space division multiplexing (SDM) and frequency division multiplexing (FDM) and the like.

[0057] When the IAB node 100B operates in half-duplex communication, the DL Parent BH becomes the receive (RX) side, the UL Parent BH becomes the transmit (TX) side, the DL Child BH becomes the transmit (TX) side, and the UL Child BH becomes the receive (RX) side. Furthermore, in the case of time division duplex (TDD), the DL / UL configuration mode within the IAB node is not limited to DL-F-UL; configuration modes such as wireless backhaul (BH) and UL-F-DL can also be applied.

[0058] In addition, in this embodiment, the backhaul link and the access link sometimes use TDM to achieve the simultaneous operation of the DU and MT of the IAB node as the center of the description, but the present invention is not limited to this, and the backhaul link and the access link may also use FDM / SDM. Figure 3 This is a diagram showing the relationship between frequency band overlap in MT and DU.

[0059] like Figure 3 As shown, the MT serving cells on the MT side are allocated different frequency bands, and the DU serving cells on the DU side are also allocated different frequency bands, which do not overlap. Here, when the MT-side radio link connection and the DU-side radio link connection share radio resources through half-duplex communication, time resources can be allocated through TDM, etc. For example, MT serving cell 1 and DU serving cell 1, and MT serving cell 4 and DU serving cell 3 are each allocated time resources. This allows for control of radio resource allocation without contention.

[0060] Here, when dual connectivity (DC) is implemented with MT service cell 2 and MT service cell 3 in the IAB node, as shown in the figure, the frequency bands of MT service cells 2 and 3 sometimes overlap with DU service cell 2, respectively, and thus, the allocation control of wireless resources becomes more complicated. Therefore, in this embodiment, wireless resource control is performed using an appropriate method as described in detail below. That is, in the DC scenario, there is a situation where the DU service cell overlaps with both a portion of the MT service cells belonging to the MCG and other MT service cells belonging to the SCG. Therefore, in this embodiment, in-depth research is conducted to enable the IAB node to accurately determine the availability of DU resources.

[0061] (2) Functional block structure of wireless communication system

[0062] Next, the functional block configurations of the parent node 100A and the IAB node 100B constituting the wireless communication system 10 will be described. Although not explicitly stated due to duplication of descriptions, the child node 100C may have the same configuration as the IAB node 100B.

[0063] (2.1) Parent node 100A

[0064] Figure 4 This is the functional block structure diagram of the parent node 100A. Figure 4 As shown, the parent node 100A includes a wireless transmission unit 110 , a wireless reception unit 120 , a NW IF unit 130 , an IAB node connection unit 140 , and a control unit 150 .

[0065] The wireless transmission unit 110 transmits a wireless signal that complies with the 5G specification. In addition, the wireless reception unit 120 transmits a wireless signal that complies with the 5G specification. In this embodiment, the wireless transmission unit 110 and the wireless reception unit 120 perform wireless communication with the IAB node 100B.

[0066] In this embodiment, the parent node 100A has the functions of an MT and a DU, and the wireless transmission unit 110 and the wireless reception unit 120 also transmit and receive wireless signals corresponding to the MT / DU.

[0067] In this embodiment, the wireless transmission unit 110 can transmit configuration information related to the availability of wireless resources in the IAB node 100B for the parent node and / or for the lower nodes to the IAB node 100B. More specifically, the wireless transmission unit 110 can transmit configuration information related to the availability of wireless resources on the MT side / DU side of the IAB node 100B to the IAB node 100B. Specific examples of the configuration information include "Hard (H)" indicating that wireless resources are used exclusively for lower nodes (DU), "Soft (S)" indicating that wireless resources are not designated exclusively for lower nodes, or "NA (Not Available)" indicating that wireless resources are unavailable for lower nodes (H / S / NA).

[0068] Furthermore, the setting information may be information that can be specified when the radio resource is not designated as dedicated to the lower node (in the case of soft (S)), and specifies whether it is available or not available for the lower node. For example, the setting information may be information called a dynamic indication or an availability indicator (AI). Furthermore, the above information may include flexible information (UL / DL / F) that further specifies the uplink (UL), downlink (DL), or any one of the DL or UL that can be used in the communication with the lower node (DU) in the IAB node 100B. In addition, the setting information includes not only explicitly indicated information but also implicitly indicated information. Specifically, when there is no explicit indication from the network, CU 50, or parent node within a fixed period for a radio resource set to soft, this situation can be interpreted as an implicit indication, and according to the setting information, for example, control may be performed to make the radio resource available for the lower node.

[0069] The NW IF unit 130 provides a communication interface for connecting to the NGC side such as the CU 50. For example, the NW IF unit 130 may include interfaces such as X2, Xn, N2, and N3.

[0070] The IAB node connection unit 140 provides an interface for connecting to an IAB node (or a child node including a UE). Specifically, the IAB node connection unit 140 functions as a distributed unit (DU). That is, the IAB node connection unit 140 is used to connect to an IAB node (or child node).

[0071] Alternatively, an IAB node may be described as a RAN node that "supports wireless access for UE 200 and wirelessly backhauls access traffic." Furthermore, a parent node or IAB donor may be described as a RAN node that "provides an interface for the UE toward the core network and wireless backhaul functionality toward the IAB node."

[0072] The control unit 150 controls each functional block that constitutes the parent node 100A. For example, the control unit 150 can perform control related to the DU soft resources of the IAB node 100B by sending setting information such as a dynamic indication or an availability indicator (AI). In addition, the control unit 150 can also perform implicit indication by not sending setting information. For example, setting information indicating that the DU resource is soft is sent from the CU 50 to the IAB node 100B, but the parent node 100A belonging to the MCG, etc., does not send explicit setting information related to the DU soft resource, and an implicit indication can be made. That is, for wireless resources available to both DU and MT, the situation where there is no explicit indication from the network may become setting information indicating an implicit indication.

[0073] The control unit 150 may have a semi-static setting indicating whether the DU soft resource of the IAB node can be used in any of DL / UL / F. Semi-static setting means that the setting content is not dynamically changed, but can be updated or changed according to instructions from the network.

[0074] The control unit 150 can obtain resource configuration information for a child node (i.e., IAB node 100B) received from the CU 50 via the NW IF unit 130. For example, the control unit 150 can obtain configuration information related to the resource configuration of the child node (i.e., IAB node 100B) observed by the control unit 150 (e.g., the H / S / NA type of the child node's DU resources). This allows the control unit 150 to dynamically control the DU soft resources, for example, if the received configuration information for the target DU resource of the child node is "Soft."

[0075] (2.2) IAB node 100B

[0076] Figure 5 FIG. 1 is a functional block diagram of the IAB node 100B constituting the IAB node. Figure 5 As shown, the IAB node 100B includes a wireless transmission unit 161 , a wireless reception unit 162 , an upper node connection unit 170 , a lower node connection unit 180 , and a control unit 190 .

[0077] As described above, the IAB node 100B has functional blocks similar to those of the parent node 100A described above, but differs in that it has an upper node connection unit 170 and a lower node connection unit 180 , and in that the function of the control unit 190 is different.

[0078] The wireless transmission unit 161 transmits a wireless signal that complies with the 5G specification. In addition, the wireless reception unit 162 receives a wireless signal that complies with the 5G specification. In this embodiment, the wireless transmission unit 161 and the wireless reception unit 162 perform wireless communication with an upper node such as the parent node 100A, and wireless communication with a lower node such as a child node (including the UE 200). For example, the wireless reception unit 162 receives setting information related to wireless resources at least for the lower node from the parent node 100A. For example, the wireless reception unit 162 may also receive setting information related to the availability of wireless resources in the IAB node 100B as a parent node and / or for the lower node.

[0079] The upper node connection unit 170 provides an interface for realizing connection with a node higher than the IAB node, etc. In addition, the upper node may also be a wireless communication node located closer to the network than the IAB node, specifically, closer to the core network side (which may also be referred to as the upstream side or the uplink side). Specifically, the upper node connection unit 170 provides the function of a mobile terminal (MT: Mobile Termination). That is, in the present embodiment, the upper node connection unit 170 is used for connection with the parent nodes 100A-1 and 2 constituting the upper node. In particular, in the present embodiment, the upper node connection unit 170 is used for duplex connection with multiple parent nodes 100A-1 and 2, specifically, for dual connection.

[0080] Furthermore, the upper node connection unit 170 is not limited to wireless communication, and is also connected to the core network side of the CU 50, etc., via a wired transmission path or the like. Thus, the control unit 190 can receive configuration information related to at least wireless resources for lower nodes from the CU 50 via the upper node connection unit 170. For example, the control unit 190 can receive configuration information related to the availability of wireless resources in the IAB node 100B for the parent node and / or for lower nodes from the CU 50 via the upper node connection unit 170. Furthermore, without limitation to this, the wireless reception unit 120 can also obtain configuration information from the CU 50 via wireless communication.

[0081] The lower node connection unit 180 provides an interface for connecting to nodes lower than the IAB node. A lower node refers to a wireless communication node located closer to the end user (also called downstream) than the IAB node.

[0082] Specifically, the lower node connection unit 180 provides the function of a distributed unit (DU). That is, in this embodiment, the lower node connection unit 180 is used to connect to a child node (which may be the UE 200) constituting a lower node.

[0083] In this embodiment, the upper node connection unit 170 is used for dual connectivity with multiple parent nodes 100A, and the lower node connection unit 180 is used for connection with one or more lower nodes (child nodes 100C, etc.). These upper node connections (MT connections) and lower node connections (DU connections) can share wireless resources.

[0084] The control unit 190 controls each functional block constituting the IAB node 100B. In particular, in this embodiment, the control unit 190 controls radio resources.

[0085] As described above, the radio resources in IAB node 100B can be used for either MTs or DUs. Furthermore, MTs can connect to two parent nodes 100A-1 and 100A-2 via dual connectivity (DC). Therefore, control unit 190 controls radio resources that can be shared by multiple parent nodes and at least one subordinate node.

[0086] More specifically, the control unit 190 controls the radio resources for the parent node (MT side) and / or the lower node (DU side) based on the configuration information received from the CU 50 or the parent node 100A. Furthermore, the control unit 190 may also control the radio resources for the parent node (MT side) and / or the lower node (DU side) based on the utilization status of the radio resources for the parent node. Furthermore, the control unit 190 may also control the radio resources for the parent node and / or the lower node based on implicit conditions, such as when no explicit configuration information is received from the CU 50 or the parent node 100A within a fixed period.

[0087] Channels include control channels and data channels. Control channels include PDCCH (Physical Downlink Control Channel), PUCCH (Physical Uplink Control Channel), PRACH (Physical Random Access Channel), and PBCH (Physical Broadcast Channel).

[0088] In addition, data channels include PDSCH (Physical Downlink Shared Channel) and PUSCH (Physical Uplink Shared Channel).

[0089] Reference signals include a demodulation reference signal (DMRS), a sounding reference signal (SRS), a phase tracking reference signal (PTRS), and a channel state information reference signal (CSI-RS). Signals include channels and reference signals. Furthermore, data can refer to data transmitted via a data channel.

[0090] UCI is symmetrical control information, which is downlink control information (DCI), and is transmitted via PUCCH or PUSCH. UCI may include SR (Scheduling Request), HARQ (Hybrid Automatic Repeat Request) ACK / NACK, and CQI (Channel Quality Indicator).

[0091] The control unit 190 can control the wireless resources based on the availability of the wireless resources indicated by the setting information. Specifically, in addition to the H / S / NA information indicated in the setting information, the control unit 190 can also determine the availability of DU resources based on the setting information of IA (Indicated as Available) or INA (Indicated as not Available) when the target resource is Soft (S). In addition, "IA" means explicitly or implicitly indicating that the DU resource is available. In addition, "INA" means explicitly or implicitly indicating that the DU resource is not available. As setting information, in addition to the dynamic indication (Dynamic Indication), the control unit 190 can also control the DU resources based on setting information such as the availability indicator (AI: Availability indicator). In addition, for example, when the wireless resources are not designated as dedicated to the lower nodes, such as when the object resource is soft (S), the control unit 190 can receive setting information (such as dynamic indication, etc.) related to the availability of wireless resources for the lower nodes from the CU 50 or one of the multiple parent nodes 100A-1, 100A-2, and control the wireless resources for the parent node (MT side) and / or the lower node (DU side) based on the received setting information.

[0092] Furthermore, the control unit 190 can grasp the utilization status of radio resources for the parent node (MT side) via the upper node connection unit 170, and can grasp the utilization status of radio resources for the lower node (DU side) via the lower node connection unit 180. Furthermore, in addition to setting information, the control unit 190 can also control radio resources based on the utilization status of radio resources for the parent node and / or for the lower node.

[0093] In addition, when the control unit 190 receives multiple setting information, it can control the wireless resource as follows. That is, for example, when the wireless resource is designated as dedicated to the lower node (Hard) in all the setting information, the control unit 190 can control so that the wireless resource is used as the lower node. In addition, when it is indicated in at least one setting information that the wireless resource is not available as the lower node, the control unit 190 can control so that the wireless resource is not used as the lower node. In addition, the control unit 190 can also control whether the wireless resource is used as the lower node based on the setting information received from the parent node (for example, the parent node whose DU resource is set to Soft) in which the wireless resource is not designated as dedicated to the lower node among the multiple setting information.

[0094] Furthermore, when the control unit 190 receives multiple pieces of configuration information, if the configuration information from at least one parent node indicates that the radio resource is available for use as a lower-level node, the control unit 190 may control the radio resource to be used as a lower-level node. Furthermore, when the control unit 190 receives multiple pieces of configuration information, if the radio resource is not available for use as an upper-level node, the control unit 190 may control the radio resource to be used as a lower-level node.

[0095] As described above, even when receiving multiple configuration information from multiple parent nodes, the control unit 190 can appropriately control the allocation of MT / DU radio resources.

[0096] (3) Operation of wireless communication system

[0097] Next, the operation of the wireless communication system 10 will be described. Specifically, the operation of controlling radio resources in the IAB node when TDM, SDM, or FDM is used under half-duplex constraints to achieve simultaneous MT / DU operation with dual connectivity to the parent node will be described.

[0098] (3.1) General Action

[0099] As reference Figure 3 As described above, when implementing simultaneous MT / DU actions (transmission and reception such as MT Tx / DU Tx (MT transmission / DU transmission), MT Tx / DU Rx (MT transmission / DU reception), MT Rx / DU Tx (MT reception / DU transmission), and MT Rx / DU Rx (MT reception / DU reception)) together with dual connections (DC) with multiple parent nodes, due to half-duplex limitations, etc., competition for wireless resources may occur in implementing the MT connection toward the parent node of DC and the DU connection toward the lower node. Therefore, it is necessary to control the wireless resources through appropriate methods. Therefore, in the following embodiment, various control steps for wireless resources are described.

[0100] (3.1-1) Action Example 1-1

[0101] Next, an example of operations related to the report of Flexible DU resources (transmission of resource information) of the IAB node will be described. Figure 6 1 is a diagram showing a control sequence of operation example 1 in this embodiment. Figure 7This diagram shows an example of resource configuration information provided by the IAB donor CU 50. In this operation example 1-1, it is assumed that one semi-static DU configuration is configured and the configuration information is shared among multiple parent nodes and child nodes.

[0102] like Figure 6 As shown, first, the IAB donor CU 50 sends the resource setting information of the IAB node 100B (for example, the setting information of H / S / NA) to the IAB node 100B, namely, GNB-DU RESOURCE CONFIGURATION (S10) (For gNB settings, refer to 3GPP TSG-RAN WG3 Meeting#107-e, "(TP to NR_IAB BL CR to 38473) PHY layer parameter configuration", R3-201355, March 2020).

[0103] Next, the IAB donor CU 50 sends the child node resource configuration information (e.g., H / S / NA configuration information) or CHILD RESOURCE CONFIGURATION to the two parent nodes 100A-1 and 100A-2 (S20, S30). That is, the parent node can obtain the semi-static configuration of the DU resources of the child node through the CHILD NODE RESOURCE CONFIGURATION from the CU 50. In addition, the child node here refers to the child node observed by the parent nodes 100A-1 and 100A-2, namely the IAB node 100B. Figure 7 As shown, the configuration information of CHILD RESOURCE CONFIGURATION and GNB-DU RESOURCE CONFIGURATION transmitted from the IAB donor CU 50 indicates the semi-static configuration (H / S / NA) of the DU resources of the IAB node 100B.

[0104] Therefore, the control unit 190 of the IAB node 100B can configure DU resources using the Hard / Soft / NA resource type for each serving cell of the IAB node DU based on the GNB-DU RESOURCE CONFIGURATION from the CU 50 (S40). Furthermore, if the downlink (DL), uplink (UL), or flexible (F) symbol is set to Hard (H) in the configuration information, the control unit 190 of the IAB node 100B can use the target resource exclusively for lower-level nodes, thereby enabling transmission (DL), reception (UL), or either transmission or reception (F) within the symbol. On the other hand, if the symbol is set to Unavailable (NA) in the configuration information, the control unit 190 of the IAB node 100B, as an IAB node DU, neither transmits nor receives the symbol.

[0105] When the DU resources are set in this manner ( S40 ), the IAB node 100B can control the radio resources in the dual connection with the parent node 100A- 1 and the parent node 100A- 2 and the connection with the child node 200 ( S50 ).

[0106] (3.1-2) Action Example 1-2

[0107] Next, the following describes the operation example 1-2 related to the case of setting multiple different semi-static configurations. That is, in operation example 1-2, the IAB node sets multiple different semi-static DU configurations for each parent node, and each parent node is provided with a semi-static DU configuration corresponding to itself. In addition, as a control sequence, the above-mentioned Figure 6 Same, therefore, continue to use Figure 6 Provide explanation.

[0108] like Figure 6 As shown, first, the IAB donor CU 50 sends GNB-DU RESOURCE CONFIGURATION, resource configuration information for IAB node 100B configured for parent nodes 100A-1 and 100A-2, to IAB node 100B (S30). Specifically, two pieces of configuration information (e.g., DU resource types Hard / Soft / NA associated with each parent node) are sent from CU 50 to IAB node 100B.

[0109] Next, the IAB donor CU 50 sends the resource configuration information for the different child nodes, namely, CHILD RESOURCE CONFIGURATION, to the two parent nodes 100A-1 and 100A-2 (S10, S20). That is, the CU 50 provides the CHILD NODE RESOURCE CONFIGURATION for the parent node 100A-1 and the CHILD NODE RESOURCE CONFIGURATION for the parent node 100A-2, so that each parent node 100A can obtain the semi-static configuration of the DU resources for its child node (IAB node 100B) configured for it. Figure 8 This is a diagram showing an example of a different Semi-static DU configuration set for each parent node 100A.

[0110] like Figure 8 As shown in Example 1-2, the semi-static configuration of hard / soft / NA of the DU resource is configured separately for the two parent nodes (MCG or SCG). In addition, the CellGroupID of the MT serving cell can be included in the semi-static configuration signaling of the hard / soft / NA of the DU resource.

[0111] Then, the control unit 190 of the IAB node 100B configures DU resources using the resource types of Hard / Soft / NA for each serving cell of the IAB node DU according to the GNB-DU RESOURCE CONFIGURATION from the CU 50 ( S40 ).

[0112] For example, when the radio resource is designated as Hard or NA, the IAB node 100B operates as follows. Figure 8 As shown in the left column of each setting information of , when the DL / UL / F codeword is set to hard for both parent nodes (MCG and SCG), the IAB node 100B can perform Tx / Rx / "either Tx or Rx" within the codeword for the DU serving cell. On the other hand, Figure 8 As shown in the right column of each setting information, when the codeword is set to NA for any parent node (MCG or SCG), the control unit 190 of the IAB node 100B does not transmit or receive the codeword as a DU.

[0113] Specifically, if all of the multiple configuration information indicates "Hard," the control unit 190 of the IAB node 100B activates the DU and does not activate the MT. Furthermore, if even one of the multiple configuration information indicates "NA," the control unit 190 of the IAB node 100B does not activate the DU and activates the MT.

[0114] In addition, in Figure 8 As shown in the middle column of Figure 1, if one parent node 1 (MCG) is set to Soft and another parent node 2 (SCG) is set to Hard, the IAB node 100B only needs dynamic indications of DU soft resources from the parent node 1 (MCG) designated as Soft. This reduces the complexity of the IAB node. Details of dynamic indications will be described later.

[0115] When the DU resources are set as described above ( S40 ), the IAB node 100B can control the wireless resources in the dual connection with the parent node 100A- 1 and the parent node 100A- 2 and the connection with the child node 200 ( S50 ).

[0116] (3.2) Action Example 2

[0117] Next, operation example 2 related to dynamic indication will be described.

[0118] Dynamic indication of DU soft resources supports both explicit and implicit indication. When a downlink (DL), uplink (UL), or flexible (F) symbol is set to soft (S), an IAB Node DU can transmit, receive, or either transmit or receive within the symbol only under the following conditions:

[0119] The case where the IAB node MT does not transmit or receive in the codeword (implicit indication)

[0120] The IAB node MT intends to transmit or receive within a symbol, and the use of symbols based on the IAB node DU does not change the transmission or reception within the symbol (implicit indication)

[0121] The IAB node MT detects DCI format 2_5, and the AI index field value indicates whether soft code elements are available (explicit indication)

[0122] ※ In the case of DCI format 2_5, the IAB node is provided with a search space set configuration (Search space set configuration) by SearchSpace-IAB to monitor the PDCCH. This search space set configuration is configured for each MT serving cell.

[0123] In the second operation example, a method of notifying the dynamic indication of the soft resources of the IAB node DU when the IAB node is connected to a plurality of parent nodes 100A-1 and 100A-2 will be described.

[0124] Hereinafter, a specific operation example will be described.

[0125] (Action Example 2-1) When the DU resource configuration information (H / S / NA) is a single configuration and is shared by both the MCG and SCG

[0126] (Action Example 2-1-1) An IAB node expects dynamic instructions from only one parent node

[0127] (Action Example 2-1-2) The IAB node expects dynamic instructions from both parent nodes

[0128] (Action Example 2-1-3) The above combination / setting

[0129] (Action Example 2-2) When the DU resource configuration information (H / S / NA) is different and is configured independently for the MCG and SCG

[0130] (3.2-1) Action Example 2-1

[0131] In Action Example 2-1, the dynamic indication of DU soft resources to the IAB node is notified by a single parent node as follows. Furthermore, in Action Example 2-1, the IAB node only expects dynamic indications of soft resource availability from a single parent node (MCG / SCG). The IAB node assumes that the other parent node (SCG / MCG) does not use the soft resources.

[0132] (3.2-1-1) Action Example 2-1-1

[0133] In option 1 of action example 2-1-1, the parent node that sends the dynamic indication is predetermined as, for example, MCG and is clarified through specifications. Figure 9 This is a diagram showing an example of the control sequence of Action Example 2-1-1.

[0134] like Figure 9As shown, the CU 50 transmits setting information designating that the node 100A-1 should function as an MCG to the parent node 100A-1 ( S10 ), and transmits setting information designating that the node 100A-2 should function as an SCG to the parent node 100A-2 ( S20 ).

[0135] Then, the parent node 100A-1 belonging to the MCG transmits a dynamic indication related to the DU soft resource of the IAB node 100B as setting information to the IAB node 100B (S30).

[0136] As a result, the IAB node 100B can determine the availability of the DU soft resource based on the setting information of the dynamic instruction ( S40 ).

[0137] When the DU resources are set ( S40 ), the IAB node 100B can control the wireless resources in the dual connection with the parent node 100A- 1 and the parent node 100A- 2 and the connection with the child node 200 ( S50 ).

[0138] Thus, in action example 2-1-1, it is predefined by the specification from which parent node the dynamic indication is expected. For example, when the IAB node is predefined as being predetermined to detect only DCI format 2_5 from the MCG and indicates through dynamic indication that the soft resources are available to the MCG, the IAB node DU is able to use the resources. On the other hand, the IAB node does not expect to be provided with the PDCCH search space for DCI format 2_5 on the SCG. Alternatively, it can also be stipulated that although the PDCCH search space for DCI format 2_5 is provided on the SCG, the IAB node does not detect DCI format 2_5 on the SCG. The IAB node is assumed to be a resource that the SCG does not use, that is, the SCG does not use the soft resources indicated by semi-static signaling.

[0139] The AI (Availability indicator) index field value of DCI format 2_5 indicates the availability of soft codewords. The IAB node DU can provide multiple combinations of availability based on availabilityCombinations for each serving cell. In addition, each availabilityCombinations contains resourceAvailability indicating the availability of soft codewords in more than one time slot of the IAB node DU serving cell, and a combination of the availability of soft codewords provided by the availabilityCombination, which maps the AI index field value corresponding to the DCI format 2_5 provided by the availabilityCombinationId. Here, Figure 10This is a diagram showing the correspondence between the AI index field value and the indication content (indication) of DCI format 2_5.

[0140] The mapping between resourceAvailability and indication is as follows Figure 10 That is,

[0141] 0. Does not indicate whether the soft code element is available

[0142] 1. Indicates that DL soft symbols are available. Does not indicate whether UL and Flexible soft symbols are available.

[0143] 2. Indicates that UL soft symbols are available. Does not indicate whether DL and flexible soft symbols are available.

[0144] 3. Indicates that DL and UL soft symbols are available. Does not indicate whether flexible soft symbols are available.

[0145] 4. Indicates that flexible soft symbols are available. Does not indicate whether DL and UL soft symbols are available.

[0146] 5. Indicates that DL and flexible soft symbols are available. Does not indicate whether UL soft symbols are available.

[0147] 6. Indicates that UL and Flexible soft symbols are available. Does not indicate whether DL soft symbols are available.

[0148] 7. Indicates that DL, UL and Flexible soft symbols are available.

[0149] As a method for expecting dynamic indication of an IAB node from only one parent node, in addition to the method defined by the above-mentioned specification, the following options are also considered.

[0150] (Option 2 of Action Example 2-1-1)

[0151] In option 2 of action example 2-1-1, the network (CU 50, etc.) sets the parent node that sends the dynamic indication. The setting method is as follows.

[0152] Option 2-1: Use signaling to explicitly notify the parent node that sent the dynamic indication

[0153] Option 2-2: Set the PDCCH search space only for the parent node that sends the dynamic indication

[0154] Option 2-3: Each parent node notifies as needed

[0155] (Option 2-1 of Action Example 2-1-1)

[0156] Explicitly setting / indicating the cell group (MCG / SCG) from which the soft resource availability is dynamically indicated can be provided by the IAB donor CU via RRC or F1-AP, or by the parent node (or cell group) via MACCE or DCI.

[0157] When dynamic indication is enabled, the IAB node is expected to detect DCI format 2_5 from the cell group. If soft resources are available, the IAB node DU can utilize these resources. If dynamic indication is not available, the IAB node does not expect to be provided with PDCCH search space for DCI format 2_5 on the cell group. Alternatively, the IAB node is provided with PDCCH search space for DCI format 2_5 but is not expected to detect DCI format 2_5 for this cell group. The IAB node assumes that this cell group does not utilize resources. Furthermore, the setting / indication can be specific to each DU serving cell or a single setting / indication for all DU serving cells.

[0158] (Option 2-2 of Action Example 2-1-1)

[0159] In option 2-2, a determination is made as to whether a PDCCH search space for DCI format 2_5 is configured. If a PDCCH search space for DCI format 2_5 is configured for each cell group, the IAB node expects to detect DCI format 2_5 from the cell group. If this indicates that soft resources are available, the IAB node DU can utilize the resources. On the other hand, if a PDCCH search space for DCI format 2_5 is not configured, the IAB node assumes that the cell group does not utilize the resources.

[0160] (Option 2-3 of Action Example 2-1-1)

[0161] Regarding each DU serving cell, the AvailabilityIndicator (AI) set in the MCG or SCG determines whether it includes the AvailabilityCombinationsPerCell for the DU serving cell. Regarding the MT serving cell of each cell group (MCG / SCG), when the AvailabilityIndicator (AI) includes the AvailabilityCombinationsPerCell of the DU serving cell, the IAB node is expected to detect the DCI format 2_5 of the DU serving cell from the cell group. If it indicates that soft resources are available, the IAB node DU can utilize the resources. On the other hand, when the AvailabilityIndicator does not include the AvailabilityCombinationsPerCell of the DU serving cell, the IAB node assumes that the cell group does not utilize the resources.

[0162] In addition, resource adjustment between MCG and SCG can be set in units of CU, and can also be implemented in other ways (refer to Action Example 2-1-3).

[0163] (3.2-1-2) Action Example 2-1-2

[0164] Example 2-1-2 describes the operation when dynamic instructions are notified by multiple parent nodes. In this example, the IAB node expects dynamic instructions from both parent nodes. When the IAB node 100B receives multiple notifications, the conditions for operating DU software resources for lower-level nodes are as follows.

[0165] When an IA (Indicated as Available: DU soft resource available) indication (setting information) is sent from all parent nodes

[0166] · When IA instructions are sent from some parent nodes and MT resources are not used

[0167] · Case where there is no instruction from all parent nodes but MT resources are not utilized

[0168] Here, Figure 11 This diagram shows the relationship between explicit or implicit indications from MCG and SCG and the availability of DU resources. In action example 2-1-2, the IAB node 100B is expected to detect DCI format 2_5 to receive dynamic indications of the availability of soft resources from both parent nodes 100A-1 and 2.

[0169] like Figure 11 As shown, in the following cases, the IAB node DU can use soft resources. Figure 11 As shown in the third row of the table, the IAB node can use the DU soft resources when DCI format 2_5 is detected from both parent nodes and indicates that soft codewords are available (when there is an explicit indication from both parent nodes).

[0170] In addition, if Figure 11 As shown in the 4th and 5th rows of the table, the IAB node can utilize DU soft resources when it detects DCI format 2_5 indicating that soft code elements are available only from the parent node (MCG or SCG) of one party, and does not affect the transceiver capability of the MT according to the usage status (setting and scheduling) of the parent node (SCG or MCG) of the other party (with explicit indication from the parent node of one party and implicit indication from the parent node of the other party).

[0171] In addition, in Figure 11 As shown in the 6th row of the table, there is no explicit indication of the availability of soft resources from the parent nodes of both parties, but the utilization of the resources does not affect the transceiver capabilities of the MT according to the usage conditions (settings and scheduling) of both MCG and SCG (when there is implicit indication from the parent nodes of both parties), and the DU soft resources can be utilized.

[0172] In addition, as a premise of action example 2-1-2, Figure 12 As shown, the IAB donor CU 50 may send the child node resource configuration information, namely, CHILD RESOURCE CONFIGURATION, to the parent nodes 100A-1 and 100A-2 in advance to obtain the configuration information of the DU soft resources.

[0173] In addition, as another embodiment of the above-mentioned action example 2-1-2, when the IAB node is connected to two parent nodes, when the downlink, uplink or flexible codeword is set to Soft, the IAB node DU can only send, receive, or either send or receive within the codeword in the following cases.

[0174] · When the IAB node MT does not perform transmission or reception in a symbol

[0175] When the IAB node MT wants to send or receive a symbol and the IAB node DU is not changed to use the symbol to send or receive the symbol

[0176] The IAB node MT detects the DCI format 2_5 from both parent nodes through the AI index field value indicating the soft code element is available.

[0177] The IAB node MT detects a DCI format 2_5 having an AI index field value indicating that soft symbols are available from the MCG (or SCG) and the IAB node MT does not transmit or receive symbols on the SCG (or MCG).

[0178] When the IAB node MT detects DCI format 2_5 with an AI index field value indicating that soft symbols are available from the MCG (or SCG) and the MT's transmission and reception in the symbols on the SCG (or MCG) are not changed by using the symbols based on the IAB node DU

[0179] (3.2-1-3) Action Example 2-1-3

[0180] This example describes the combination / setting of Option 2 of Action Example 2-1-1 and Option 2-1-2. Specifically, when the IAB node 100B receives one piece of configuration information from one parent node, it operates according to Option 2 of Action Example 2-1-1. When it receives configuration information from multiple parent nodes, it operates according to Option 2 of Action Example 2-1-2.

[0181] In addition, if there is no notification from the parent node, any of the following default actions are performed.

[0182] Alt 1: Make DU take action

[0183] Alt 2: Make DU take action without using MT resources

[0184] Alt 3: Do not make DU take action

[0185] More specifically, according to action example 2-1-2, an IAB node can configure / instruct whether to expect to detect DCI format 2_5 to obtain dynamic indications regarding the availability of soft resources from each cell group. Action example 2-1-2 is applied when an IAB node is configured / instructed to expect to detect DCI format 2_5 only from one cell group to obtain dynamic indications regarding the availability of soft resources.

[0186] On the other hand, if the IAB node is configured / instructed to expect detection of DCI format 2_5 for dynamic indications regarding soft resource availability from multiple cell groups, action example 2-2 applies. For example, in both the MCG and SCG, the AvailabilityIndicator includes the AvalabilityCombinationsPerCell of the DU serving cell, and the DU serving cell expects dynamic indications from both the MSC and SCG. Here, if the IAB node MT detects DCI format 2_5 from both parent nodes and indicates that the AI index field value is available, the IAB node DU can transmit / receive the symbol.

[0187] If the IAB node is not configured / instructed to detect DCI format 2_5 for dynamic indications related to soft resource availability from any cell group in the MCG and SCG, for example, the AvailabilityIndicator does not include the AvalabilityCombinationsPerCell of the DU serving cell. In this case, the default IAB node behavior is defined by one of the following:

[0188] Alt1: The IAB node DU can perform Tx / Rx on the resource. The IAB node DU assumes that both parent nodes (MCG and SCG) do not use the resource.

[0189] Alt2: When it is determined from implicit indication that resources are available, that is, when the IAB node MT does not transmit or receive within a codeword, or when the IAB node MT transmits or receives within a codeword and does not change the transmission or reception within the codeword to use the codeword based on the IAB node DU, the IAB node DU can transmit / receive on the resources.

[0190] Alt3: The IAB node DU cannot perform Tx / Rx on the resource.

[0191] (3.2-2) Action Example 2-2

[0192] Operation Example 2-2 is described, assuming that the configuration information (H / S / NA) of DU resources is configured differently and independently for MCG and SCG.

[0193] (Case 1)

[0194] In this case 1, when one is set to Hard and the other is set to Soft, the parent node of the other resource set to Soft transmits setting information for dynamically instructing IA / INA.

[0195] More specifically, this section describes the operation in the case where a resource is semi-statically set to Hard in one cell group and to Soft in another. For a cell group where resources are set to Soft, the IAB node determines whether the resource is available using the following Release 16 functionality. If the resource is explicitly or implicitly indicated as available, the IAB node DU can use the resource.

[0196] When an IAB node is connected to two parent nodes in a downlink, uplink or flexible codeword, if the codeword is set to Hard for MCG (or SCG) and is set to Soft for SCG (or MCG), the IAB node DU can only send, receive, or either send or receive within the codeword in the following cases.

[0197] The case where the IAB node MT does not use the code elements on the SCG (or MCG) for transmission and reception

[0198] The IAB node MT uses the codewords on the SCG (or MCG) for transmission and reception, but the codeword transmission and reception are not changed because the IAB node DU uses the codewords

[0199] ※In addition, the IAB node MT detects DCI format 2_5 having an AI index field value indicating that soft codewords are available from the SCG (MCG).

[0200] (Case 2)

[0201] If all of the multiple configuration information indicates soft resources, action example 2-1-2 is applied. That is, if resources are configured as soft for both cell groups, action example 2-1-2 can be used. In this action example 2-2, the IAB node is expected to detect DCI format 2_5 only from cell groups where soft resources are semi-statically configured.

[0202] The above is an example of an action for controlling wireless resources in the present embodiment. In addition, a possible solution to support action example 1-1 is to manage resource adjustment by CU 50. CU 50 can indicate the H / S / NA settings of the child node 100B in the parent node 100A. Therefore, for the resources of the IAB node 100B, CU 50 can indicate the resources as "Soft" in one of the parent nodes 100A-1 and indicate the resources as "Hard" in the other parent node 100A-2. In the case where the resources of the child node are indicated as "Hard", the parent node does not use the resources. Figure 13In the example, the CU 50 can indicate the resources of the child node as "Hard" to the SCG, in which case the SCG does not utilize the "Hard" resources of the child node, so the IAB node 100B only needs an indication of the availability of soft resources from the MCG.

[0203] Another possible solution to support action example 1-1 is to implement the SCG to never utilize the soft resources of the child node, but the resources of the child node are indicated as soft. In this case, the IAB node also only needs the indication of the availability of soft resources from the MCG.

[0204] The above is an example of the operation of this embodiment.

[0205] (4) Action / Effect

[0206] The above-described embodiment achieves the following effects. Specifically, the IAB node 100B of this embodiment includes a connection unit (an upper node connection unit 170 and a lower node connection unit 180) for dual connections with multiple parent nodes (MT dual connections) and connections with one or more lower nodes (DU connections), enabling the sharing of wireless resources; and a reception unit (a wireless reception unit 120) for receiving configuration information related to wireless resources for at least lower nodes from the parent node 100A or the central device 50. This allows the sharing of configuration information related to the availability of resources that can be shared with the upper node (MT side), and the acquisition of information for accurate resource management in both MT dual connections and DU connections.

[0207] More specifically, according to this embodiment, since wireless resources for the parent node (MT side) and / or for the lower node (DU side) are controlled based on setting information received from the central device 50 or the parent node 100A, information related to the settings regarding the availability of sharable resources is obtained. As a result, MT connections and DU connections that achieve dual connections with multiple parent nodes can be made under half-duplex restrictions, etc., and appropriate resource control can be performed in the MT and DU even in situations where resource management becomes complicated.

[0208] Furthermore, according to this embodiment, in addition to received configuration information, radio resource control for the parent node (MT side) and / or for the lower-level node (DU side) is performed based on the utilization status of radio resources for the parent node. Therefore, even in situations where, for example, there is no explicit instruction from the upper-level node regarding DU soft resources, the utilization status of sharable radio resources on the MT side is taken into account, thereby enabling appropriate resource control. More specifically, when the DU is not using the target resource while the MT is using it, or when the DU is not using the target resource while the MT is not using it, resource control can be performed to provide the resource to the DU, etc.

[0209] Furthermore, according to this embodiment, even when wireless resources are not designated as dedicated to lower nodes (e.g., Hard) (e.g., in the case of DU soft resources), setting information regarding the availability of wireless resources for lower nodes (e.g., dynamic indications such as Available or NA (Not Available)) is received from the central device 50 or one of the multiple parent nodes 100A-1, 100A-2. Based on the received setting information, control of the wireless resources for the parent node (MT side) and / or for the lower nodes (DU side) is performed. Therefore, even when wireless resources are not designated as dedicated to lower nodes (e.g., in the case of DU soft resources), accurate resource control can be achieved based on an indication of availability of the target node from the upper node.

[0210] Furthermore, according to this embodiment, the following actions are performed:

[0211] When a plurality of setting information is received, if the radio resource is designated as dedicated for lower-level nodes (for example, Hard) in all the setting information, control is performed so that the radio resource is used for lower-level nodes.

[0212] When receiving multiple pieces of setting information, at least one of which indicates that the radio resource cannot be used for the lower node (e.g., NA), controlling the radio resource so that it is not used for the lower node, and / or

[0213] Controlling whether the radio resource is used for lower-level nodes based on the setting information received from the parent node for which the radio resource is not designated as dedicated for lower-level nodes (e.g., Hard) among the plurality of setting information,

[0214] Therefore, even when there are multiple pieces of setting information in an environment where the parent node 100A is multi-connected and multiple pieces of setting information are connected, resources can be managed accurately.

[0215] In addition, according to this embodiment, when multiple setting information is received, when the setting information from at least one parent node 100A indicates that the wireless resource can be used for the lower node, and / or when the wireless resource is not used for the upper node, control is performed so that the wireless resource is used for the lower node. Therefore, in an environment where the parent node 100A has multiple dual connections, accurate resource management can be performed based on multiple setting information and / or the MT utilization status of the resource.

[0216] (5) Other Implementation Methods

[0217] Although the embodiment has been described above, the present invention is not limited to the description of the embodiment, and it is obvious that various modifications and improvements can be made by those skilled in the art.

[0218] For example, in the above embodiments, the names parent node, IAB node, and child node are used. However, as long as a wireless communication node structure is adopted that integrates wireless backhaul between wireless communication nodes such as gNBs and wireless access with terminals, these names can be different. For example, they can be simply called first node, second node, etc., or they can be called upper node, lower node, relay node, intermediate node, etc.

[0219] In addition, a wireless communication node may be simply referred to as a communication device or a communication node, and may also be replaced by a wireless base station.

[0220] In the above embodiments, the terms downlink (DL) and uplink (UL) are used, but other terms may be used. For example, they may be replaced with or associated with terms such as forward link, reverse link, access link, and backhaul. Alternatively, only terms such as first link, second link, first direction, and second direction may be used.

[0221] In addition, the block diagram ( Figure 3 、 4 ) shows blocks in units of functions. These functional blocks (structural parts) are implemented by any combination of at least one of hardware and software. In addition, there is no particular limitation on the implementation method of each functional block. That is, each functional block can be implemented using a device that is physically or logically combined, or it can be implemented by connecting two or more physically or logically separated devices directly or indirectly (for example, using wired or wireless connections) and using these multiple devices. The functional block can also be implemented by combining software with the above-mentioned one device or the above-mentioned multiple devices.

[0222] Functionally, these include, but are not limited to, judging, deciding, determining, calculating, calculating, processing, deriving, investigating, searching, confirming, receiving, sending, outputting, accessing, resolving, selecting, choosing, establishing, comparing, assuming, expecting, regarding, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assigning. For example, a functional block (structural unit) that enables the transmission function is called a transmitting unit or a transmitter. In short, as described above, there is no particular limitation on the implementation method.

[0223] Furthermore, the above-mentioned CU 50 , wireless communication nodes 100A to 100C, and UE 200 (the device) may also function as a computer that performs the processing of the wireless communication method of the present disclosure. Figure 14 FIG. 1 is a diagram showing an example of the hardware structure of the device. Figure 14 As shown, the device may also be configured as a computer device including a processor 1001 , a memory 1002 (memory), a storage 1003 (storage), a communication device 1004 , an input device 1005 , an output device 1006 , and a bus 1007 .

[0224] In the following description, the word "device" can be replaced with "circuit," "device," "unit," etc. The hardware structure of the device may include one or more of the devices shown in the figures, or may exclude some of the devices.

[0225] Each functional block of the device (refer to Figure 3 、 4 ) is implemented by any hardware element or combination of hardware elements of the computer device.

[0226] In addition, each function in the device is implemented by the following method: predetermined software (program) is read into hardware such as the processor 1001 and the memory 1002, so that the processor 1001 performs calculations and controls the communication of the communication device 1004 or controls at least one of the reading and writing of data in the memory 1002 and the storage 1003.

[0227] The processor 1001 controls the entire computer by, for example, running an operating system. The processor 1001 may be composed of a central processing unit (CPU) including an interface with peripheral devices, a control device, a calculation device, registers, and the like.

[0228] In addition, the processor 1001 reads programs (program codes), software modules, data, etc. from at least one of the memory 1003 and the communication device 1004 to the memory 1002, and performs various processes accordingly. As a program, a program that causes the computer to perform at least a part of the actions described in the above-mentioned embodiment is used. Moreover, with respect to the above-mentioned various processes, although it is described that the above-mentioned various processes are performed by one processor 1001, the above-mentioned various processes can also be performed simultaneously or sequentially by more than two processors 1001. The processor 1001 can also be installed by one or more chips. In addition, the program can also be sent from the network via a telecommunications line.

[0229] Memory 1002 is a computer-readable recording medium and may be composed of, for example, at least one of a read-only memory (ROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), and a random access memory (RAM). Memory 1002 may also be referred to as a register, a cache, or a main memory (main storage device). Memory 1002 may store programs (program code), software modules, and the like that enable execution of the method according to an embodiment of the present disclosure.

[0230] The memory 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 floppy disk, a magneto-optical disc (for example, a compact disc, a digital versatile disc, a Blu-ray (registered trademark) disc), a smart card, a flash memory (for example, a card, a stick, a key drive), a Floppy (registered trademark) disk, a magnetic strip, and the like. The memory 1003 may also be referred to as an auxiliary storage device. The above-mentioned recording medium may be, for example, a database, a server, or other appropriate media that includes at least one of the memory 1002 and the memory 1003.

[0231] The communication device 1004 is hardware (transceiver) for communicating between computers via at least one of a wired network and a wireless network, and is also called a network device, a network controller, a network card, a communication module, etc.

[0232] For example, the communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, and the like in order to realize at least one of frequency division duplex (FDD) and time division duplex (TDD).

[0233] The input device 1005 is an input device that receives input from the outside (e.g., a keyboard, mouse, microphone, switch, button, sensor, etc.). The output device 1006 is an output device that outputs to the outside (e.g., a display, speaker, LED light, etc.). Alternatively, the input device 1005 and the output device 1006 may be integrally formed (e.g., a touch panel).

[0234] Furthermore, the processor 1001 and the memory 1002 and other devices are connected via a bus 1007 for communicating information. The bus 1007 may be configured using a single bus or may be configured using separate buses for each device.

[0235] Furthermore, the device may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a programmable logic device (PLD), or a field-programmable gate array (FPGA), and some or all of the functional blocks may be implemented using such hardware. For example, the processor 1001 may be implemented using at least one of these hardware components.

[0236] In addition, the notification of information is not limited to the form / implementation method described in the present disclosure, and other methods may also be used. For example, the notification of information may be implemented through physical layer signaling (e.g., downlink control information (DCI: Downlink Control Information), uplink control information (UCI: Uplink Control Information), high-layer signaling (e.g., RRC signaling, medium access control (MAC: Medium Access Control) signaling, broadcast information (Master Information Block (MIB: Master Information Block), System Information Block (SIB: System Information Block)), other signals or a combination thereof. In addition, RRC signaling may also be referred to as an RRC message, such as an RRC Connection Setup message, an RRC Connection Reconfiguration message, etc.

[0237] Each form / embodiment described in this disclosure may also be applied to at least one of LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), Future Radio Access (FRA), New Radio (NR), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, UWB (Ultra-WideBand), Bluetooth (registered trademark), systems using other appropriate systems, and next-generation systems derived therefrom. Furthermore, a combination of multiple systems (e.g., a combination of at least one of LTE and LTE-A with 5G) may also be applied.

[0238] The processing procedures, timings, and flows of each form / implementation described in this disclosure may be performed in a different order unless there is a conflict. For example, the methods described in this disclosure use an illustrative order to present the elements of various steps, but are not limited to the specific order presented.

[0239] In this disclosure, specific actions performed by a base station are sometimes performed by its upper node, depending on the situation. In a network consisting of one or more network nodes including a base station, various actions performed to communicate with a terminal can be performed by at least one of the base station and other network nodes other than the base station (for example, an MME or S-GW, but not limited thereto). In the above description, the example of a single other network node other than the base station is illustrated, but the other network node may also be a combination of multiple other network nodes (for example, an MME and an S-GW).

[0240] Information, signals (information, etc.) can be output from a higher layer (or lower layer) to a lower layer (or higher layer), and can also be input or output via multiple network nodes.

[0241] Input or output information can be stored in a specific location (e.g., memory) or managed using a management table. Input or output information can be overwritten, updated, or appended. Output information can also be deleted. Input information can also be sent to other devices.

[0242] The determination may be made using a value represented by one bit (0 or 1), a Boolean value (true or false), or a comparison of numerical values (for example, comparison with a predetermined value).

[0243] Each form / implementation described in this disclosure may be used individually or in combination, and may be switched between them depending on the execution. Furthermore, notification of scheduled information is not limited to being performed explicitly (e.g., a notification of "yes X") but may also be performed implicitly (e.g., not notifying the scheduled information).

[0244] Software, whether referred to as software, firmware, middleware, microcode, hardware description language, or by other names, shall be interpreted broadly to refer to instructions, sets of instructions, code, code segments, program code, programs, subroutines, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, etc.

[0245] Furthermore, software, commands, information, and the like may be transmitted and received via a transmission medium. For example, if software is transmitted from a website, server, or other remote source using at least one of a wired technology (coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and a wireless technology (infrared, microwave, etc.), then at least one of these wired and wireless technologies is included within the definition of a transmission medium.

[0246] The information, signals, etc. described in this disclosure may also be represented using any of a variety of different technologies. For example, data, commands, instructions, information, signals, bits, symbols, chips, etc. that may be referred to in the entire description may be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any combination thereof.

[0247] In addition, the terms used in this disclosure and those necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, at least one of a channel and a symbol may be a signal (signaling). Furthermore, a signal may be a message. Furthermore, a component carrier (CC) may be referred to as a carrier frequency, a cell, a frequency carrier, etc.

[0248] As used in this disclosure, the terms "system" and "network" are used interchangeably.

[0249] In addition, the information, parameters, etc. described in this disclosure may be represented by absolute values, relative values relative to predetermined values, or other corresponding information. For example, wireless resources may also be indicated by indexes.

[0250] The names used for the above parameters are not limiting in any way. Furthermore, the formulas and the like using these parameters may sometimes differ from those explicitly disclosed in this disclosure. Various channels (e.g., PUCCH, PDCCH, etc.) and information elements can be identified by appropriate names, and the names assigned to these channels and information elements are not limiting in any way.

[0251] In this disclosure, terms such as "base station (BS)", "wireless base station", "fixed station", "NodeB", "eNodeB (eNB)", "gNodeB (gNB)", "access point", "transmission point", "reception point", "transmission / reception point", "cell", "sector", "cell group", "carrier", and "component carrier" are used interchangeably. Base stations are also sometimes referred to as macrocells, small cells, femtocells, and picocells.

[0252] A base station can accommodate one or more (for example, three) cells (also known as sectors). When a base station accommodates multiple cells, the base station's overall coverage area can be divided into multiple smaller areas, each of which can also provide communication services through a base station subsystem (for example, a small base station (Remote Radio Head: RRH) for indoor use).

[0253] The terms "cell" or "sector" refer to a portion or the entire coverage area of at least one of a base station and a base station subsystem that provides communication services within the coverage area.

[0254] In the present disclosure, terms such as “mobile station (MS)”, “user terminal (user terminal)”, “user equipment (UE)”, and “terminal” may be used interchangeably.

[0255] For mobile stations, those skilled in the art sometimes also use the following terms to refer to them: 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.

[0256] At least one of the base station and the mobile station may also be referred to as a transmitting device, a receiving device, a communication device, etc. In addition, at least one of the base station and the mobile station may be a device mounted on a mobile body, the mobile body itself, etc. The mobile body may be a vehicle (e.g., a car, an airplane, etc.), a mobile body that moves unmanned (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). In addition, at least one of the base station and the mobile station also includes a device that does not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

[0257] In addition, the base station in the present disclosure can also be replaced by a mobile station (user terminal, the same below). For example, regarding a structure in which the communication between a base station and a mobile station is replaced by communication between multiple mobile stations (for example, it can also be called device-to-device (D2D: Device-to-Device), vehicle-to-everything system (V2X: Vehicle-to-Everything), etc.), the various forms / implementations of the present disclosure can also be applied. In this case, it is also possible to set a structure in which the mobile station has the functions of the base station. In addition, terms such as "uplink" and "downlink" can also be replaced by terms corresponding to communication between terminals (for example, "side"). For example, uplink channels, downlink channels, etc. can also be replaced by side channels.

[0258] Likewise, the mobile station in the present disclosure may be replaced by a base station. In this case, the base station may have the same functions as the mobile station.

[0259] A radio frame can be composed of one or more frames in the time domain. In the time domain, one or more frames can be called a subframe. A subframe can be further composed of one or more time slots in the time domain. A subframe can also be a fixed time length (e.g., 1 ms) that is independent of the numerology.

[0260] A parameter set may be a communication parameter applied to at least one of the transmission and reception of a signal or channel. For example, the parameter set may represent at least one of the following: subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame structure, specific filtering performed by the transceiver in the frequency domain, specific windowing performed by the transceiver in the time domain, and the like.

[0261] In the time domain, a slot may be composed of one or more symbols (Orthogonal Frequency Division Multiplexing (OFDM) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, etc.) A slot may be a time unit based on a parameter set.

[0262] A time slot may contain multiple mini-slots. Each mini-slot may consist of one or more symbols in the time domain. Furthermore, a mini-slot may also be referred to as a sub-slot. A mini-slot may consist of fewer symbols than a time slot. A PDSCH (or PUSCH) transmitted in time units larger than a mini-slot may be referred to as PDSCH (or PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot may be referred to as PDSCH (or PUSCH) mapping type B.

[0263] Radio frame, subframe, time slot, mini-time slot, and symbol all represent time units for signal transmission. Radio frame, subframe, time slot, mini-time slot, and symbol may be referred to by other corresponding names.

[0264] For example, a subframe can also be called a transmission time interval (TTI), multiple consecutive subframes can also be called a TTI, and a slot or a mini-slot can also be called a TTI. That is, at least one of a subframe and a TTI can be a subframe (1ms) in existing LTE, a period shorter than 1ms (for example, 1-13 symbols), or a period longer than 1ms. Furthermore, the unit representing a TTI can be a slot, a mini-slot, or the like, rather than a subframe.

[0265] Here, TTI refers to, for example, the minimum time unit for scheduling in wireless communications. For example, in the LTE system, a base station schedules the allocation of radio resources (such as the frequency bandwidth and transmit power available to each user terminal) to each user terminal using TTIs. The definition of TTI is not limited to this.

[0266] The TTI can be the time unit for transmitting data packets (transport blocks), code blocks, code words, etc. after channel coding, and can also be the processing unit for scheduling, link adaptation, etc. In addition, when a TTI is given, the time interval (for example, the number of symbols) to which the transport blocks, code blocks, code words, etc. are actually mapped can be shorter than the TTI.

[0267] In addition, when one time slot or one mini-time slot is referred to as a TTI, one or more TTIs (i.e., one or more time slots or one or more mini-time slots) can constitute the minimum time unit for scheduling. In addition, the number of time slots (the number of mini-time slots) constituting the minimum time unit for scheduling can be controlled.

[0268] A TTI with a time length of 1 ms may also be referred to as a normal TTI (TTI in LTE Rel. 8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, a long subframe, a time slot, etc. A TTI shorter than a normal TTI may be referred to as a shortened TTI, a short TTI, a partial or fractional TTI, a shortened subframe, a short subframe, a minislot, a subslot, a time slot, etc.

[0269] In addition, for long TTI (for example, normal TTI, subframe, etc.), it can be replaced with a TTI with a time length of more than 1ms, and for short TTI (for example, shortened TTI, etc.), it can be replaced with a TTI length that is smaller than long TTI (longTTI) and has a TTI length of more than 1ms.

[0270] A resource block (RB) is a unit of resource allocation in the time and frequency domains. In the frequency domain, it can contain one or more consecutive subcarriers. The number of subcarriers contained in an RB can be the same regardless of the parameter set, for example, it can be 12. The number of subcarriers contained in an RB can also be determined by the parameter set.

[0271] In addition, the time domain of an RB may include one or more symbols and may be the length of one slot, one mini-slot, one subframe, or one TTI. One TTI, one subframe, etc. may each be composed of one or more resource blocks.

[0272] In addition, one or more RBs may be referred to as a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, and the like.

[0273] Furthermore, a resource block may be composed of one or more resource elements (REs). For example, one RE may be a radio resource region of one subcarrier and one symbol.

[0274] A Bandwidth Part (BWP) (also known as a fractional bandwidth) can represent a subset of contiguous common resource blocks (RBs) for a particular parameter set within a carrier. Common RBs can be identified by their index relative to the common reference point of the carrier. PRBs can be defined within a BWP and numbered within that BWP.

[0275] The BWP may include a BWP for UL (UL BWP) and a BWP for DL (DL BWP). One or more BWPs may be configured for a UE within a single carrier.

[0276] At least one of the configured BWPs may be active, and it is not assumed that the UE transmits or receives predetermined signals / channels outside of the activated BWP. In addition, "cell", "carrier", etc. in the present disclosure may be replaced with "BWP".

[0277] The above-described structures of radio frames, subframes, slots, mini-slots, and symbols are merely examples. For example, various modifications may be made to the structures including the number of subframes in a radio frame, the number of slots per subframe or radio frame, the number of mini-slots in a slot, the number of symbols and RBs in a slot or mini-slot, the number of subcarriers in an RB, the number of symbols in a TTI, the symbol length, and the cyclic prefix (CP) length.

[0278] The terms "connected", "coupled" or any variation of these terms are intended to indicate any direct or indirect connection or combination between two or more elements, and may include situations where there is one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The combination or connection between elements may be a physical combination or connection, a logical combination or connection, or a combination of these. For example, "access" may be used instead of "connection". As used in this disclosure, two elements may 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 as some non-limiting and non-inclusive examples, electromagnetic energy having wavelengths in the wireless frequency domain, microwave region and optical (visible and invisible) region may be used to "connect" or "couple" to each other.

[0279] The reference signal may be referred to as Reference Signal (RS) for short, or may be referred to as a pilot signal depending on the applied standard.

[0280] The phrase "according to" used in this disclosure does not mean "only according to" unless otherwise expressly stated. In other words, the phrase "according to" means both "only according to" and "at least according to."

[0281] The “unit” in the configuration of each of the above-mentioned devices may be replaced with a “section,” “circuit,” “device,” or the like.

[0282] Any reference to an element using the terms "first," "second," etc., as used in this disclosure, does not necessarily limit the number or order of these elements. These terms can be used as a convenient way to distinguish between two or more elements in this disclosure. Therefore, a reference to a first element and a second element does not imply that only two elements can be used or that the first element must precede the second element in any manner.

[0283] When the terms "include," "including," and variations thereof are used in this disclosure, these terms are intended to be inclusive, similar to the term "comprising." Furthermore, the term "or" used in this disclosure does not mean an exclusive OR.

[0284] In the present disclosure, when an article is added by translation, such as a, an, and the in English, the present disclosure may also include cases where the noun following the article is in a plural form.

[0285] As used in this disclosure, terms such as “determining” and “determining” sometimes also include a variety of actions. “Determining” and “judging” may, for example, include considering matters such as judging, calculating, computing, processing, deriving, investigating, looking up, searching, inquiring (for example, searching in a table, database or other data structure), and ascertaining as matters that have been “determined” or “determined”. In addition, “determining” and “receiving” (for example, receiving information), transmitting (for example, sending information), inputting, outputting, accessing (for example, accessing data in a memory) as matters that have been “determined” or “determined”. In addition, “determining” and “resolving” may include matters such as selecting, choosing, establishing, and comparing as matters that have been “determined” or “determined”. That is, "judgment" and "decision" can include matters that are considered to have "judged" or "decided" any action. In addition, "judgment (decision)" can also be replaced by "assuming (assuming)", "expecting (expecting)", "considering (considering)", etc.

[0286] In this disclosure, the phrase "A is different from B" may also mean "A and B are different from each other." Furthermore, the phrase may also mean "A and B are each different from C." Terms such as "separate" and "combined" may also be interpreted in the same way as "different."

[0287] While the present disclosure has been described in detail above, it should be clear to those skilled in the art that the present disclosure is not limited to the embodiments described herein. The present disclosure can be implemented in various modifications and variations without departing from the spirit and scope of the present disclosure as defined by the claims. Therefore, the description of the present disclosure is for illustrative purposes only and does not have any limiting meaning on the present disclosure.

[0288] Description of labels

[0289] 10: Wireless communication system;

[0290] 50: CU;

[0291] 100A: parent node;

[0292] 100B: IAB node;

[0293] 100C: child node;

[0294] 110: wireless transmission unit;

[0295] 120: wireless receiving unit;

[0296] 130: NW IF Department;

[0297] 140: IAB node connection part;

[0298] 150;Control Department;

[0299] 161: wireless transmission unit;

[0300] 162: wireless receiving unit;

[0301] 170: upper node connection;

[0302] 180: lower node connection;

[0303] 190;Control Department;

[0304] 200:UE;

[0305] 1001: processor;

[0306] 1002: Memory;

[0307] 1003: memory;

[0308] 1004: Communication device;

[0309] 1005: input device;

[0310] 1006: Output device.

[0311] 1007: Bus.

Claims

1. A wireless communication node comprising: a receiving unit that receives downlink control information including a field value indicating availability of resources for a lower node from one of two cell groups in which the wireless communication node performs dual connectivity; and A control unit that uses the resources to perform communication with the lower node when the field value in the downlink control information received from one of the two cell groups indicates that the resources can be used and the transmission and reception between the other of the two cell groups is not changed by using the resources.

2. The wireless communication node according to claim 1, wherein The downlink control information is DCI format 2_5.

3. The wireless communication node according to claim 1 or 2, wherein: The resources are soft symbols.

4. A wireless communication method, performed by a wireless communication node, comprising the following steps: receiving, from one of the two cell groups in which the wireless communication node performs dual connectivity, downlink control information including a field value indicating availability of resources for a lower node; and When the field value in the downlink control information received from one of the two cell groups indicates that the resource can be used and transmission and reception with the other of the two cell groups is not changed by using the resource, communication with the lower node is performed using the resource.

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