Wireless communication node and wireless communication method

Abstract

This wireless communication node receives, from a lower-level node, a link display designating the link direction for a time resource which is to be allocated to a wireless link in the lower-level node, and transmits the link display received from the lower-level node to another lower-level node.

Description

[Technical Field]

[0001] The present disclosure relates to a wireless communication node and a wireless communication method for configuring wireless access and wireless backhaul. [Background technology]

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

[0003] For example, the NR radio access network (RAN) specifies Integrated Access and Backhaul (IAB), which integrates wireless access to terminals (User Equipment, UE) and wireless backhaul between wireless communication nodes such as radio base stations (gNBs) (see Non-Patent Document 1).

[0004] In IAB, an IAB node has a Mobile Termination (MT), which is a function for connecting with a parent node (which may also be called an IAB donor), and a Distributed Unit (DU), which is a function for connecting with a child node or UE.

[0005] Furthermore, the IAB is also studying dual connectivity (DC) scenarios, such as intra-band DC and intra-carrier DC (Non-Patent Document 2). [Prior art documents] [Non-patent literature]

[0006] [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 [Non-patent document 2] "RAN1 Chairman's Notes", 3GPP TSG RAN WG1 Meeting #103-e, 3GPP, November 2020 Summary of the Invention

[0007] In the case of the above-mentioned Intra-band DC, etc., there is a half-duplex communication restriction in each symbol (time resource), so the IAB node (MT) can only transmit and receive in one link direction (uplink (UL) / downlink (DL)) in each symbol.

[0008] Therefore, when two parent nodes targeted by DC instruct different (that is, contradictory) link directions, the IAB node (MT) cannot individually respond to the instructions.

[0009] Therefore, the following disclosure has been made in consideration of such circumstances, and aims to provide a wireless communication node and a wireless communication method that can operate normally even when the specified link directions are inconsistent, such as in intra-band DC.

[0010] One aspect of the present disclosure is a wireless communication node (wireless communication node 50) comprising a receiving unit (lower node connection unit 55) that receives from a lower node a link indication indicating the link direction of time resources allocated to a wireless link in the lower node, and a transmitting unit (transmitting unit) that transmits the link indication received from the lower node to another lower node.

[0011] One aspect of the present disclosure is a wireless communication node (wireless communication node 150) that includes a receiving unit (upper node connection unit 170) that receives a link indication from a first upper node that indicates the link direction of time resources allocated to a wireless link with a lower node, and a transmitting unit (upper node connection unit 170) that transmits the link indication received from the first upper node to a second upper node.

[0012] One aspect of the present disclosure is a wireless communication node (wireless communication node 150) comprising a receiving unit (upper node connection unit 170) that receives link indications from a first upper node and a second upper node, respectively, indicating the link direction of time resources allocated to a wireless link with a lower node, and a control unit (control unit 190) that operates in accordance with either the link indication received from the first upper node or the link indication received from the second upper node.

[0013] One aspect of the present disclosure is a method for transmitting a link indication from a first upper node to a wireless communication node, the link indication indicating a link direction of time resources allocated to a wireless link with the lower node; and a step in which the wireless communication node transmits the link indication received from the lower node to another lower node.

[0014] One aspect of the present disclosure is a method for transmitting a link indication from a first upper node to a wireless communication node, the link indication indicating a link direction of time resources allocated to a wireless link with the lower node; and transmitting, by the wireless communication node, the link indication received from the lower node to a second upper node.

[0015] One aspect of the present disclosure is a wireless communication method including a step in which a wireless communication node receives link indications from a first upper node and a second upper node, respectively, indicating a link direction of time resources allocated to a wireless link with a lower node, and a step in which the wireless communication node operates in accordance with either the link indication received from the first upper node or the link indication received from the second upper node. [Brief explanation of the drawings]

[0016] [Figure 1] FIG. 1 is a diagram showing the overall schematic configuration of a wireless communication system 10. As shown in FIG. [Figure 2] FIG. 2 is a functional block diagram of the wireless communication node 150. [Figure 3] FIG. 3 is a functional block diagram of the wireless communication node 50. As shown in FIG. [Figure 4] FIG. 4 is a diagram showing an example of link display in the IAB Intra-band DC scenario. [Figure 5] FIG. 5 is a diagram showing an example of Dynamic indication of a slot format according to operation example 2-1 (Option 1). [Figure 6] FIG. 6 is a diagram showing an example of Dynamic indication of a slot format according to operation example 2-1 (Option 2). [Figure 7] FIG. 7 is a diagram showing an example of Dynamic indication of a slot format according to the operation example 2-2. [Figure 8] FIG. 8 is a diagram illustrating an example of the hardware configuration of the wireless communication node 50, the wireless communication node 100, and the wireless communication node 150. As shown in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0017] Hereinafter, embodiments will be described with reference to the drawings. Note that the same or similar reference numerals are used to designate the same functions or configurations, and descriptions thereof will be omitted as appropriate.

[0018] (1) Overall configuration of the wireless communication system 1 is a schematic diagram of the overall configuration of a wireless communication system 10 according to this embodiment. The wireless communication system 10 is a wireless communication system conforming to 5G New Radio (NR) and is configured by a plurality of wireless communication nodes and terminals. Note that the wireless communication system 10 may also be a wireless communication system conforming to a scheme called Beyond 5G, 5G Evolution, or 6G.

[0019] Specifically, the wireless communication system 10 includes a Next Generation-Radio Access Network 20 (hereinafter referred to as NG-RAN 20), a wireless communication node 50, a wireless communication node 100, a wireless communication node 150, and a terminal 200 (hereinafter referred to as UE 200, User Equipment).

[0020] The wireless communication node 50, the wireless communication node 100, and the wireless communication node 150 can establish wireless access (Access link) with the UE 200 and wireless backhaul (Backhaul link) between the wireless communication nodes via the cell. For example, a backhaul (transmission path) by a wireless link may be established between the wireless communication node 50 and the wireless communication node 100, or between the wireless communication node 100 and the wireless communication node 150.

[0021] Such a configuration in which the wireless access to the UE 200 and the wireless backhaul between the wireless communication nodes are integrated is called Integrated Access and Backhaul (IAB).

[0022] The IAB will reuse existing functions and interfaces defined for radio access, in particular Mobile-Termination (MT), gNB-DU (Distributed Unit), gNB-CU (Central Unit), User Plane Function (UPF), Access and Mobility Management Function (AMF) and Session Management Function (SMF), as well as corresponding interfaces such as NR Uu (MT to gNB / DU), F1, NG, X2, and N4, may be used as a baseline.

[0023] The wireless communication node 100 is connected to the NG-RAN 20 and a core network (Next Generation Core (NGC) or 5GC) via a wired transmission path such as fiber transport. The NG-RAN and NGC may be collectively referred to simply as the "network."

[0024] In this embodiment, the wireless communication node 50 may constitute an IAB donor in the IAB, and the wireless communication node 100 may constitute a parent node in the IAB. Also, the wireless communication node 150 may constitute an IAB node in the IAB.

[0025] Note that the IAB donor (which may be a parent node) may be called a higher-level node in relation to the IAB node. Furthermore, the IAB donor may be called a parent node, or vice versa. Also, the IAB donor may have a CU, and the parent node may simply be used as a name in relation to the IAB node (or child node), and may not have a CU. The IAB node may be called a lower-level node in relation to the IAB donor (parent node). Also, the child node may include UE 200.

[0026] A wireless link (Backhaul link) is established between an IAB donor (or parent node) and an IAB node. Specifically, a wireless link called Link_parent may be established. A wireless link (Backhaul link) is established between an IAB node and a child node. Specifically, a wireless link called Link_child may be established.

[0027] Link_parent may be configured with a DL Parent BH in the downlink direction and a UL Parent BH in the uplink direction. Link_child may be configured with a DL Child BH in the downlink direction and a UL Child BH in the uplink direction.

[0028] An IAB node (which may include a parent node) has a Mobile Termination (IAB-MT), which is a function for connecting to an IAB donor (or parent node), and a Distributed Unit (IAB-DU), which is a function for connecting to a child node (or UE 200). The child node also has an MT and a DU. The IAB donor has a Central Unit (CU) and a DU.

[0029] From the DU's perspective, the radio resources used by the DU, including the downlink (DL), uplink (UL), and flexible time-resource (D / U / F), are classified into one of the following types: Hard, Soft, or Not Available (H / S / NA). Even within Soft (S), available or not available is specified.

[0030] Flexible time-resource (F) is a radio resource (time resource and / or frequency resource) that can be used for either DL or UL. "Hard" refers to a radio resource whose corresponding time resource is always available for a DU child link connected to a child node or UE, and "Soft" refers to a radio resource (DU resource) whose availability for a DU child link is explicitly or implicitly controlled by an IAB donor (or parent node).

[0031] Furthermore, in the case of Soft(S), the radio resource to be notified can be determined based on whether it is IA or INA.

[0032] "IA" means that the DU resource is explicitly or implicitly marked as available, and "INA" means that the DU resource is explicitly or implicitly marked as unavailable.

[0033] In this embodiment, the wireless access and wireless backhaul may be half-duplex or full-duplex, and the multiplexing methods available are time division multiplexing (TDM), space division multiplexing (SDM), and frequency division multiplexing (FDM).

[0034] When an IAB node operates in half-duplex communication, the DL Parent BH is the receiving (RX) side, the UL Parent BH is the transmitting (TX) side, the DL Child BH is the transmitting (TX) side, and the UL Child BH is the receiving (RX) side. In addition, in the case of Time Division Duplex (TDD), the DL / UL configuration pattern in the IAB node is not limited to DL-F-UL only, and configuration patterns such as UL-F-DL only or wireless backhaul (BH) only may be applied. In this embodiment, SDM / FDM is used to realize simultaneous operation of the DU and MT of the IAB node.

[0035] Furthermore, the wireless communication system 10 can also support dual connectivity (DC) scenarios, such as intra-band DC and intra-carrier DC, in IAB.

[0036] Intra-band DC is DC within a specific frequency band, and multiple component carriers (CCs) may be used. Intra-Carrier DC is DC within a band for one CC. Intra-band DC may include Intra-Carrier DC.

[0037] 1, a wireless communication node 150 (IAB node) may be connected to two wireless communication nodes 100 and execute DC. In this case, one wireless communication node 100 may configure a master cell group (MCG), and the other wireless communication node 100 may configure a secondary cell group (SCG).

[0038] (2) Functional block configuration of wireless communication system Next, a description will be given of the functional block configuration of the wireless communication system 10. Specifically, the functional block configurations of the wireless communication node 50 and the wireless communication node 150 will be described.

[0039] (2.1) Wireless communication node 150 2 is a functional block diagram of a wireless communication node 150 constituting an IAB node. As shown in FIG. 2, the wireless communication node 150 includes a wireless communication unit 110, an upper node connection unit 170, a lower node connection unit 180, and a control unit 190.

[0040] The wireless communication unit 110 transmits and receives wireless signals conforming to NR. The wireless communication unit 110 can support Massive MIMO, which generates a more directional beam by controlling radio (RF) signals transmitted from multiple antenna elements, Carrier Aggregation (CA), which aggregates and uses multiple component carriers (CCs), and Dual Connectivity (DC), which simultaneously communicates between a UE and two NG-RAN nodes.

[0041] The upper node connection unit 170 provides an interface that realizes connection with a node higher than the IAB node. Note that the upper node refers to a wireless communication node located on the network side, specifically, on the core network side (which may also be called the upstream side or uplink side), than the IAB node.

[0042] Specifically, the upper node connection unit 170 provides a function of Mobile Termination (MT). That is, in this embodiment, the upper node connection unit 170 is used for connection with a parent node (wireless communication node 100) that constitutes an upper node.

[0043] The upper node connection unit 170 can also receive a link indication indicating the link direction of the time resource allocated to the wireless link with the lower node from any one of the wireless communication nodes 100 (first upper node). Furthermore, the upper node connection unit 170 can transmit the link indication received from the first upper node to another wireless communication node 100 (second upper node).

[0044] In this embodiment, the upper node connection unit 170 may constitute a transmitter and a receiver. The first upper node and the second upper node may be interpreted as wireless communication nodes executing DC.

[0045] The time resource may be, for example, a slot, but may also be a symbol which is shorter than a slot, or a subframe which is longer than a slot.

[0046] The link direction may indicate either DL (which may be expressed as "D") or UL (which may be expressed as "U"), i.e., it can be used for communication in that direction.

[0047] The link indication may be interpreted as an indication that the time resource (e.g., slot) can be used in either DL or UL. The link indication may be applied to Data Center (DC) using TDD. The link indication may also be called a TDD indication, a Dynamic indication, etc.

[0048] Alternatively, the upper node connection unit 170 may receive the link indications as described above from the first upper node and the second upper node, respectively.

[0049] The lower node connection unit 180 provides an interface that realizes connection with a node lower than the parent node. Note that a lower node refers to a wireless communication node located closer to the end user (may also be called the downstream side or downlink side) than the IAB node.

[0050] 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 for connection with a child node (which may be the UE 200) that constitutes a lower node.

[0051] The control unit 190 executes control of each functional block that configures the wireless communication node 150. In particular, in this embodiment, the control unit 190 can execute control related to DC with the two wireless communication nodes 100.

[0052] Specifically, the control unit 190 may operate according to either a link indication received from any wireless communication node 100 (first upper node) to which the DC is connected, or a link indication received from another wireless communication node 100 (second upper node) to which the DC is connected.

[0053] Specifically, the control unit 190 may perform DL reception or UL transmission in the corresponding time resource (for example, slot) based on the link direction (DL or UL) indicated by the link indication.

[0054] The control unit 190 may ignore or discard the unused link display of the two received link displays. Alternatively, the control unit 190 may prioritize the link display received from the MCG (or SCG).

[0055] (2.2) Wireless communication node 50 3 is a functional block diagram of a wireless communication node 50 constituting an IAB donor. As shown in FIG. 2, the wireless communication node 50 includes a wireless communication unit 51, a NW IF unit 53, a lower node connection unit 55, and a control unit 57.

[0056] The wireless communication unit 51 transmits and receives wireless signals conforming to NR. The wireless communication unit 51 can support Massive MIMO, which generates a more directional beam by controlling radio (RF) signals transmitted from multiple antenna elements, and Carrier Aggregation (CA), which uses multiple component carriers (CCs) by bundling them together. Note that the wireless communication unit 51 may or may not support DC.

[0057] The NW IF unit 53 provides a communication interface that realizes connection with the NGC side, etc. For example, the NW IF unit 53 can include interfaces such as X2, Xn, N2, and N3.

[0058] The lower node connection unit 55 provides an interface that realizes connection with a node lower than the IAB donor. Note that the lower node means a wireless communication node located on the end user side (which may also be called the downstream side or downlink side) of the IAB donor, and may include the wireless communication node 100 (parent node) and the wireless communication node 150 (IAB node).

[0059] The lower node connection unit 55 can receive a link indication (TDD indication) indicating the link direction of time resources allocated to a wireless link in the lower node (which may mean the parent node here) from the lower node (parent node). In this embodiment, the lower node connection unit 55 may constitute a receiving unit that receives the link indication from the lower node.

[0060] The wireless link in the lower node (parent node) may refer to the wireless link between the parent node (wireless communication node 100) and the IAB node (wireless communication node 150), rather than the wireless link between the IAB donor (wireless communication node 50) and the parent node (wireless communication node 100).

[0061] Furthermore, the lower node connection unit 55 may transmit the link indication received from the lower node to another lower node (wireless communication node 100). In this embodiment, the lower node connection unit 55 may constitute a transmitting unit that transmits the link indication to another lower node.

[0062] The control unit 57 executes control of each functional block constituting the wireless communication node 50. In particular, in this embodiment, the control unit 57 executes DC and can execute control related to DC between the wireless communication node 100 constituting the master node (MN) and the wireless communication node 100 constituting the secondary node (SN).

[0063] (3) Operation of the wireless communication system Next, a description will be given of the operation of the wireless communication system 10. Specifically, a description will be given of the operation relating to TDD in Intra-band DC in IAB.

[0064] (3.1) Premise In the Intra-band DC scenario, there is a half-duplex restriction. For this reason, for example, if two DC-connected parent nodes individually instruct different link directions on the same symbol, the IAB-MT cannot simultaneously transmit (UL) to one parent node and receive (DL) from the other parent node.

[0065] Considering that the two parent nodes can independently and dynamically determine scheduling, the two parent nodes may indicate different link directions (link indications), and the contents of the instructions may conflict with each other.

[0066] Figure 4 shows an example of link display in the IAB Intra-band DC scenario. As shown in Figure 4, when IAB-MT receives instructions from two parent nodes (referred to here as PN1 and PN2 for convenience) that specify different link directions (the area surrounded by the dashed line where "D" and "U" do not match), that is, when it receives instructions for inconsistent link directions, IAB-MT cannot operate normally.

[0067] (3.2) Operation overview The following describes the operation of a wireless communication node that can solve the above-mentioned problems. That is, the following describes how to deal with a case where link indications (TDD indications) dynamically notified from an MCG and an SCG are inconsistent in an Intra-band DC. Specifically, the following operation example will be described.

[0068] (Example 1): IAB-MT does not follow the Dynamic indication of the TDD pattern notified by MCG / SCG. (Example 2): IAB-MT follows the dynamic indication of the TDD pattern notified by MCG / SCG. (Example 2-1): Even if there is a Dynamic indication, IAB-MT expects the TDD pattern of MCG / SCG to be the same. The sharing of TDD pattern information between parent nodes may be performed in any of the following ways.

[0069] (Option 1): A parent node reports a TDD pattern to an IAB donor, which then notifies another parent node of the reported TDD pattern. (Option 2): IAB-MT reports the information of one TDD pattern to the other parent node, and the parent node sets the reported content. (Example 2-2): Even if there is a dynamic indication, IAB-MT considers that the TDD patterns of MCG / SCG are different. For IAB-MT behavior, any of the following may apply: (Option 1): The TDD pattern set in the MCG takes precedence. (Option 2): The Radio Resource Control layer (RRC) / Medium Access Control layer (MAC) control element (MAC-CE) / Downlink Control Information (DCI) indicates which TDD pattern (MCG / SCG) is prioritized. (Option 3): Prefer dynamically configured (or semi-statically configured) TDD patterns The IAB-MT may notify the parent node of the low-priority cell group of information about the high-priority TDD pattern. After notification, the IAB-MT may expect at least one of the following instructions:

[0070] (Option 1): Expect new notifications from low priority cell groups (Option 2): Notification content is applied to the cell group with low priority (Option 3): Maintain the notification content of the first configured low-priority cell group (Operation example 3): IAB-MT assumes that the TDD pattern dynamic indication is notified only from either MCG or SCG. (Option 1): Specifies that only either the MCG or the SCG notifies the dynamic indication. (Option 2): MCG / SCG that notifies dynamic indication is set

[0071] (3.3) Example of operation Next, the details of the above-mentioned operation examples 1 to 3 will be explained.

[0072] (3.3.1) Example 1 In this example operation, the IAB-MT does not need to expect a dynamic indication of the slot format from the MCG or SCG.

[0073] Specifically, the IAB-MT may expect semi-static configuration of the same slot format for the MCG and SCG.

[0074] When this operation example is applied, only semi-static setting of the slot format is supported, and dynamic indication of the slot format does not need to be supported. Therefore, the IAB node does not need to assume a collision of link directions indicated by two parent nodes.

[0075] (3.3.2) Example 2 In this operation example, the IAB-MT may expect a dynamic indication of the slot formats of both the MCG and SCG.

[0076] In operation example 2-1, the IAB-MT may assume semi-static setting of the same slot format for the MCG and SCG, or dynamic indication. Note that the following cases may be included.

[0077] Dynamic indication of MCG and SCG slot formats is the same.

[0078] The dynamic indication of the slot format of one cell group is identical to the semi-static setting of the other cell group.

[0079] In operation example 2-2, the IAB-MT may assume different slot formats that are semi-statically or dynamically configured for the MCG and the SCG. Note that the following cases may be included:

[0080] Dynamic indication for MCG and SCG slot formats is different.

[0081] · The dynamic indication of the slot format of one cell group differs from the semi-static setting of the other cell group.

[0082] (3.3.2.1) Example 2-1 Fig. 5 shows an example of Dynamic indication of a slot format according to operation example 2-1 (Option 1), and Fig. 6 shows an example of Dynamic indication of a slot format according to operation example 2-1 (Option 2).

[0083] This requires information exchange between the two parent nodes regarding slot format setting / instruction.

[0084] As shown in FIG. 5, in Option 1, PN1 (MCG / SCG) may transmit information about the slot format of PN1 (MCG / SCG) to the IAB donor, and then transmit the information from the IAB donor to PN2 (MCG / SCG).

[0085] Note that information exchange between the IAB donor and the parent node may use F1-AP (Application), RRC, MAC-CE, or Layer 1 (physical layer) signaling. In the case of a semi-static slot format, information transmission from PN1 to the IAB donor (step 1) may be omitted.

[0086] As shown in Figure 6, in Option 2, the slot format information of PN1 (MCG / SCG) may be transmitted from PN1 (MCG / SCG) to the IAB node (IAB-MT), and then transmitted (forwarded) from the IAB node to PN2 (MCG / SCG).

[0087] Information exchange between the parent node and the IAB node may use MAC-CE or Layer 1 (physical layer) signaling. Note that information transmission from PN1 to IAB-MT (step 1) may follow the semi-static slot format or dynamic indication of 3GPP Release 15 / 16.

[0088] (3.3.2.2) Example 2-2 In this operation example, the IAB-MT may assume that different slot formats are set / instructed by the MCG and SCG.

[0089] For Option 1, by default, the slot format configured or specified for the MCG (or SCG) may have higher priority.

[0090] In the case of Option 2, it may be explicitly configured / indicated by RRC / MAC-CE / DCI, regardless of whether the slot format configured / indicated for MCG or SCG has higher priority.

[0091] An IAB node may cancel symbol-by-symbol UL transmissions for a lower priority cell group when configured / instructed as DL for a higher priority cell group, whereas an IAB node may cancel symbol-by-symbol DL transmissions for a lower priority cell group when configured / instructed as UL for a higher priority cell group.

[0092] In the case of Option 3, by default, the dynamic indication of the slot format may take precedence over (or even over) the semi-static slot format.

[0093] For example, if the slot format of the MCG is dynamically specified and the slot format of the SCG is semi-statically set, the MCG may have a higher priority.

[0094] In addition, when the slot formats of the MCG and SCG are set semi-statically, or when there is a dynamic indication of the slot formats of the MCG and SCG, Option 1 or Option 2 may be applied.

[0095] In this case, if the IAB node is configured / instructed as DL on a symbol-by-symbol basis for the higher priority cell group, it may consider both cell groups as DL and cancel symbol-by-symbol UL transmissions for the lower priority cell group. On the other hand, if the IAB node is configured / instructed as UL on a symbol-by-symbol basis for the higher priority cell group, it may consider both cell groups as UL and cancel symbol-by-symbol DL transmissions for the lower priority cell group.

[0096] The UL transmission may include all or part of a PUCCH (Physical Uplink Control Channel), a PUSCH (Physical Uplink Shared Channel), a SRS (Sounding Reference Signal), and a PRACH (Physical Random Access Channel).

[0097] Furthermore, DL reception may include all or part of PDSCH / PDCCH / SSB (Synchronization Signal / Physical Broadcast Channel blocks) / CSI-RS (Channel State Information Reference Signal).

[0098] In addition, in the operation example 2-2, if the slot formats are different, the IAB node may cancel UL transmission / DL reception on the cell group, which may cause resource waste and performance degradation of the canceled cell group. To address this problem, the following operation may be performed.

[0099] 7 shows an example of dynamic indication of a slot format according to operation example 2-2. Based on the above-described operation example, when different slot formats are set / instructed in the MCG and the SCG, the IAB node may notify the parent node of the cell group with a lower priority of the slot format set / instructed for the cell group with a higher priority.

[0100] The notification may be made using Layer 1 signaling or MAC-CE. As for the operation of the IAB node for the notification, as described above, at least one of the following indications may be expected:

[0101] (Option 1): Expect new notifications from low priority cell groups (Option 2): Notification content is applied autonomously to low-priority cell groups (Option 3): Maintain the notification content of the initially configured low-priority cell group. Specifically, keep the slot format indicated for the low-priority cell group, but do not expect the setting / indication of UL transmission / DL reception from the low-priority cell group in symbols with different link directions.

[0102] Note that UL transmission may include all or part of PUCCH / PUSCH / SRS / PRACH, and DL reception may include all or part of PDSCH / PDCCH / SSB / CSI-RS.

[0103] Furthermore, this operation example may be applied to Intra-Carrier DC and Intra-band DC. In this operation example, the operation (behavior) of IAB-MT has been described, but the same operation may be applied when UE 200 executes DC.

[0104] The semi-static configuration of the slot format may include the following:

[0105] DL / UL configured by tdd-UL-DL-ConfigurationCommon via RRC DL / UL configured by tdd-UL-DL-ConfigDedicated-IAB-MT via RRC (if tdd-UL-DL-ConfigDedicated applies to the UE) Also, the slot format Dynamic indication may include the following content:

[0106] Explicit DL / UL indication in DCI format 2_0 Explicit indication of DL / UL override flexible symbol in semi-static setting (Example of change) Explicit DL / UL override flexible symbol instruction or UL / DL override symbol in semi-static setting Implicit indication by setting / instructing UL transmission or DL ​​reception Implicit DL / UL override flexible symbol in quasi-static configuration (Example of change) Explicit DL / UL override flexible symbol instruction or UL / DL override symbol in semi-static setting UL transmission may include all or part of PUCCH / PUSCH / SRS / PRACH, and DL reception may include all or part of PDSCH / PDCCH / SSB / CSI-RS.

[0107] (3.3.3) Example 3 In this operation example, it is assumed that the IAB node receives a Dynamic indication of the TDD pattern only from either the MCG or the SCG.

[0108] In the case of Option 1, by default, only the MCG (or SCG) can expect a dynamic indication of the slot format.

[0109] In the case of Option 2, whether or not to expect a dynamic indication of the slot format may be explicitly configured / indicated by RRC / MAC-CE / DCI.

[0110] If an IAB node expects a dynamic indication of the slot format for a cell group, it may act according to one of the following:

[0111] ·IAB-MT does not expect DCI format 2_0, which indicates the slot format of the cell group.

[0112] ·IAB-MT does not expect to configure / instruct UL transmission / DL reception for cell groups on flexible symbols.

[0113] (4) Actions and Effects According to the above-described embodiment, the following advantageous effects can be obtained: Specifically, the wireless communication node 50 (IAB donor) can transmit a link indication (such as a dynamic indication) received from a lower node to another lower node.

[0114] Furthermore, the wireless communication node 150 (IAB node) can transmit a link indication received from the wireless communication node 100 (first upper node) to another wireless communication node 100 (second upper node). Alternatively, the wireless communication node 150 (IAB node) can operate according to either the link indication received from the first upper node or the link indication received from the second upper node.

[0115] Therefore, even if different (i.e., mutually contradictory) link directions are specified by two parent nodes targeted by the DC, that is, even if the specified link directions are contradictory, normal operation is possible.

[0116] (5) Other embodiments Although the embodiments have been described above, it will be obvious to those skilled in the art that the present invention is not limited to the description of the embodiments and that various modifications and improvements are possible.

[0117] For example, in the above-described embodiment, the names of parent node, IAB node, and child node are used, but as long as a wireless communication node configuration in which wireless backhaul between wireless communication nodes such as gNBs and wireless access with terminals are integrated is adopted, the names may be different. For example, they may be simply called first and second nodes, or may be called upper nodes, lower nodes, relay nodes, intermediate nodes, etc.

[0118] Furthermore, the wireless communication node may be simply called a communication device or a communication node, or may be read as a wireless base station.

[0119] The block diagrams (FIGS. 2 and 3) used to explain the above-described embodiments show functional blocks. These functional blocks (components) are realized by any combination of hardware and / or software. Furthermore, the method for realizing each functional block is not particularly limited. That is, each functional block may be realized using a single device that is physically or logically coupled, or may be realized using two or more physically or logically separated devices that are connected directly or indirectly (for example, by wire, wirelessly, etc.) and these multiple devices. The functional block may also be realized by combining software with the single device or multiple devices.

[0120] Functions include, but are not limited to, judgment, determination, judgment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, election, establishment, comparison, assumption, expectation, consideration, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assignment. For example, a functional block (component) that performs transmission is called a transmitting unit or transmitter. As mentioned above, there are no particular limitations on how each is implemented.

[0121] Furthermore, the above-described wireless communication node 50, wireless communication node 100, and wireless communication node 150 (the devices) may function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 8 is a diagram showing an example of the hardware configuration of the devices. As shown in Fig. 8, the devices may be configured as a computer including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0122] In the following description, the term "apparatus" can be interpreted as a circuit, a device, a unit, etc. The hardware configuration of the apparatus may be configured to include one or more of the apparatuses shown in the drawings, or may be configured to exclude some of the apparatuses.

[0123] Each functional block of the device (see FIGS. 2 and 3) is realized by any hardware element of the computer device or a combination of the hardware elements.

[0124] In addition, each function of the device is realized by loading specified software (programs) onto hardware such as processor 1001 and memory 1002, causing processor 1001 to perform calculations, control communication via communication device 1004, and control at least one of reading and writing data in memory 1002 and storage 1003.

[0125] The processor 1001 controls the entire computer by running, for example, an operating system, and may be configured as a central processing unit (CPU) including an interface with peripheral devices, a control unit, an arithmetic unit, a register, and the like.

[0126] The processor 1001 also reads programs (program codes), software modules, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and executes various processes in accordance with these. The programs used are those that cause a computer to execute at least some of the operations described in the above-mentioned embodiments. Furthermore, the various processes described above may be executed by one processor 1001, or may be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 may be implemented by one or more chips. The programs may be transmitted from a network via a telecommunications line.

[0127] The memory 1002 is a computer-readable recording medium and may be configured by, for example, at least one of a read-only memory (ROM), an erasable programmable ROM (EPROM), an electrically erasable programmable ROM (EEPROM), a random access memory (RAM), etc. The memory 1002 may also be called a register, a cache, a main memory (primary storage device), etc. The memory 1002 can store a program (program code), a software module, etc., that can execute a method according to an embodiment of the present disclosure.

[0128] Storage 1003 is a computer-readable recording medium, and may be, for example, at least one of an optical disk such as a Compact Disc ROM (CD-ROM), a hard disk drive, a flexible disk, a magneto-optical disk (e.g., a compact disk, a digital versatile disk, a Blu-ray disc), a smart card, a flash memory (e.g., a card, a stick, a key drive), a floppy disk, a magnetic strip, etc. Storage 1003 may also be referred to as an auxiliary storage device. The above-mentioned recording medium may be, for example, a database, a server, or other appropriate medium including at least one of memory 1002 and storage 1003.

[0129] The communication device 1004 is hardware (transmission / reception device) for communicating between computers via at least one of a wired network and a wireless network, and is also called, for example, a network device, a network controller, a network card, or a communication module.

[0130] The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. to realize, for example, at least one of Frequency Division Duplex (FDD) and Time Division Duplex (TDD).

[0131] The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that receives input from the outside. The output device 1006 is an output device (for example, a display, a speaker, an LED lamp, etc.) that outputs to the outside. The input device 1005 and the output device 1006 may be integrated into one device (for example, a touch panel).

[0132] Furthermore, each device such as the processor 1001 and the memory 1002 is connected to a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using different buses between each device.

[0133] Furthermore, the device may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), or a field programmable gate array (FPGA), and some or all of the functional blocks may be realized by the hardware. For example, the processor 1001 may be implemented using at least one of these pieces of hardware.

[0134] Furthermore, the notification of information is not limited to the aspects / embodiments described in the present disclosure, and may be performed using other methods. For example, the notification of information may be performed by physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI)), higher layer signaling (e.g., RRC signaling, Medium Access Control (MAC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB))), other signals, or a combination thereof. Furthermore, the RRC signaling may be referred to as an RRC message, and may be, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, or the like.

[0135] Each aspect / embodiment described in the present disclosure may be applied to at least one of a system using Long Term Evolution (LTE), LTE-Advanced (LTE-A), SUPER 3G, IMT-Advanced, a 4th generation mobile communication system (4G), a 5th generation mobile communication system (5G), Future Radio Access (FRA), New Radio (NR), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), or other suitable system, and a next-generation system extended based on these. Furthermore, a combination of multiple systems (e.g., a combination of at least one of LTE and LTE-A and 5G) may also be applied.

[0136] The order of the procedures, sequences, flowcharts, etc. of each aspect / embodiment described in this disclosure may be changed unless it is consistent. For example, the methods described in this disclosure present elements of various steps using an example order, and are not limited to the particular order presented.

[0137] In the present disclosure, a specific operation described as being performed by a base station may also be performed by its upper node in some cases. In a network consisting of one or more network nodes having a base station, it is clear that various operations performed for communication with a terminal may be performed by at least one of the base station and another network node other than the base station (for example, but not limited to, an MME or an S-GW). Although the above example illustrates a case where there is one other network node other than the base station, a combination of multiple other network nodes (for example, an MME and an S-GW) may also be used.

[0138] Information, signals (information, etc.) may be output from a higher layer (or a lower layer) to a lower layer (or a higher layer), or may be input / output via multiple network nodes.

[0139] Input and output information may be stored in a specific location (for example, memory) or may be managed using a management table. Input and output information may be overwritten, updated, or added to. Output information may be deleted. Input information may be sent to another device.

[0140] The determination may be made based on a value represented by one bit (0 or 1), a Boolean value (true or false), or a numerical comparison (e.g., comparison with a predetermined value).

[0141] Each aspect / embodiment described in this disclosure may be used alone, in combination, or switched depending on the implementation. Furthermore, notification of predetermined information (e.g., notification that "X is true") is not limited to being done explicitly, but may be done implicitly (e.g., by not notifying the predetermined information).

[0142] Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

[0143] Software, instructions, information, etc. may also be transmitted or received over a transmission medium. For example, if software is transmitted from a website, server, or other remote source using wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), and / or wireless technologies (such as infrared, microwave), then these wired and / or wireless technologies are included within the definition of transmission media.

[0144] The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0145] Note that terms explained in this disclosure and terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, at least one of a channel and a symbol may be a signal (signaling). Furthermore, a signal may be a message. Furthermore, a component carrier (CC) may be called a carrier frequency, a cell, a frequency carrier, etc.

[0146] As used in this disclosure, the terms "system" and "network" are used interchangeably.

[0147] Furthermore, the information, parameters, etc. described in the present disclosure may be expressed using absolute values, relative values ​​from a predetermined value, or other corresponding information. For example, a radio resource may be indicated by an index.

[0148] The names used for the above-described parameters are not intended to be limiting in any way. Furthermore, the mathematical expressions using these parameters may differ from those explicitly disclosed in this disclosure. The various channels (e.g., PUCCH, PDCCH, etc.) and information elements may be identified by any suitable names, and therefore the various names assigned to these various channels and information elements are not intended to be limiting in any way.

[0149] In this disclosure, terms such as "base station (BS)," "radio base station," "fixed station," "NodeB," "eNodeB (eNB)," "gNodeB (gNB)," "access point," "transmission point," "reception point," "transmission / reception point," "cell," "sector," "cell group," "carrier," and "component carrier" may be used interchangeably. Base stations may also be referred to by terms such as macrocell, small cell, femtocell, and picocell.

[0150] A base station can accommodate one or more (e.g., three) cells (also called sectors). When a base station accommodates multiple cells, the overall coverage area of ​​the base station can be divided into multiple smaller areas, and each smaller area can be provided with communication services by a base station subsystem (e.g., a small indoor base station (Remote Radio Head: RRH)).

[0151] The terms "cell" or "sector" refer to part or all of the coverage area of ​​a base station and / or base station subsystem that provides communication services within that coverage area.

[0152] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," etc. may be used interchangeably.

[0153] A mobile station may also be referred to by those skilled in the art as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable terminology.

[0154] At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a communication device, etc. At least one of the base station and the mobile station may be a device mounted on a mobile object, or the mobile object itself. The mobile object may be a vehicle (e.g., a car, an airplane, etc.), an unmanned mobile object (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). At least one of the base station and the mobile station may also include devices that do not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

[0155] Furthermore, a base station in the present disclosure may be read as a mobile station (user terminal, the same applies hereinafter). For example, the aspects / embodiments of the present disclosure may be applied to a configuration in which communication between a base station and a mobile station is replaced with communication between multiple mobile stations (which may be called, for example, Device-to-Device (D2D) or Vehicle-to-Everything (V2X)). In this case, the mobile station may be configured to have the functions of a base station. Furthermore, terms such as "uplink" and "downlink" may be read as terms corresponding to communication between terminals (for example, "side"). For example, terms such as uplink channel and downlink channel may be read as side channel.

[0156] Similarly, a mobile station in the present disclosure may be interpreted as a base station, in which case the base station may have the functions of a mobile station. A radio frame may be composed of one or more frames in the time domain. Each of the one or more frames in the time domain may be called a subframe. A subframe may further be composed of one or more slots in the time domain. A subframe may have a fixed time length (e.g., 1 ms) that is independent of numerology.

[0157] Numerology may be a communication parameter applied to at least one of transmission and reception of a signal or channel, such as subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame structure, specific filtering operations performed by a transceiver in the frequency domain, and specific windowing operations performed by a transceiver in the time domain.

[0158] A slot may consist of one or more symbols in the time domain (such as an Orthogonal Frequency Division Multiplexing (OFDM) symbol, a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol, etc.) A slot may be a numerology-based time unit.

[0159] A slot may include multiple minislots. Each minislot may consist of one or more symbols in the time domain. A minislot may also be called a subslot. A minislot may consist of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a minislot may be called PDSCH (or PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a minislot may be called PDSCH (or PUSCH) mapping type B.

[0160] The radio frame, subframe, slot, minislot, and symbol all represent time units for transmitting signals, and may be referred to by other names corresponding to the radio frame, subframe, slot, minislot, and symbol.

[0161] For example, one subframe may be called a transmission time interval (TTI), multiple consecutive subframes may be called a TTI, or one slot or one minislot may be called a TTI. That is, at least one of the subframe and the TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (e.g., 1-13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, minislot, etc., instead of a subframe.

[0162] Here, TTI refers to, for example, the smallest time unit for scheduling in wireless communication. For example, in an LTE system, a base station performs scheduling to allocate radio resources (such as frequency bandwidth and transmission power that can be used by each user terminal) to each user terminal in TTI units. However, the definition of TTI is not limited to this.

[0163] The TTI may be a transmission time unit for a channel-encoded data packet (transport block), a code block, a code word, etc., or may be a processing unit for scheduling, link adaptation, etc. When a TTI is given, the time interval (e.g., the number of symbols) to which a transport block, a code block, a code word, etc. is actually mapped may be shorter than the TTI.

[0164] When one slot or one minislot is called a TTI, one or more TTIs (i.e., one or more slots or one or more minislots) may be the minimum time unit for scheduling. Also, the number of slots (minislots) constituting the minimum time unit for scheduling may be controlled.

[0165] A TTI having a time length of 1 ms may be called a regular TTI (TTI in LTE Rel. 8-12), normal TTI, long TTI, regular subframe, normal subframe, long subframe, slot, etc. A TTI shorter than a regular TTI may be called a shortened TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, minislot, subslot, slot, etc.

[0166] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length of more than 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be interpreted as a TTI having a TTI length shorter than the TTI length of a long TTI and equal to or greater than 1 ms.

[0167] A resource block (RB) is a resource allocation unit in the time domain and frequency domain, and may include one or more consecutive subcarriers in the frequency domain. The number of subcarriers included in an RB may be the same regardless of numerology, for example, 12. The number of subcarriers included in an RB may also be determined based on numerology.

[0168] The time domain of an RB may include one or more symbols and may be one slot, one minislot, one subframe, or one TTI in length. Each TTI, subframe, etc. may be composed of one or more resource blocks.

[0169] Note that one or more RBs may also be called a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, or the like.

[0170] 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.

[0171] A Bandwidth Part (BWP) (which may also be referred to as a fractional bandwidth) may represent a subset of contiguous common resource blocks (RBs) for a given numerology on a given carrier, where the common RBs may be identified by their index relative to a common reference point of the carrier. PRBs may be defined in a given BWP and numbered within that BWP.

[0172] The BWP may include a BWP for UL (UL BWP) and a BWP for DL ​​(DL BWP). One or more BWPs may be configured for a UE within one carrier.

[0173] At least one of the configured BWPs may be active, and the UE may not expect to transmit or receive a given signal / channel outside the active BWP. Note that the terms "cell," "carrier," etc. in this disclosure may be read as "BWP."

[0174] The above-described structures of the radio frame, subframe, slot, minislot, and symbol are merely examples. For example, the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the cyclic prefix (CP) length, and other configurations can be changed in various ways.

[0175] The terms "connected," "coupled," or any variation thereof, refer to any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, "connected" may be read as "access." As used in this disclosure, two elements may be considered to be "connected" or "coupled" to each other using one or more wires, cables, and / or printed electrical connections, as well as electromagnetic energy having wavelengths in the radio frequency range, microwave range, and optical (both visible and invisible) range, as some non-limiting and non-exhaustive examples.

[0176] The reference signal may also be abbreviated as Reference Signal (RS), and may also be called a pilot depending on the applicable standard.

[0177] As used in this disclosure, the phrase "based on" does not mean "based only on," unless expressly stated otherwise. In other words, the phrase "based on" means both "based only on" and "based at least on."

[0178] The "means" in the configuration of each of the above devices may be replaced with "part," "circuit," "device," etc.

[0179] As used in this disclosure, any reference to an element using a designation such as "first," "second," etc. does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, a reference to a first and a second element does not imply that only two elements may be employed therein or that the first element must precede the second element in some way.

[0180] When used in this disclosure, the terms "include," "including," and variations thereof are intended to be inclusive, similar to the term "comprising." Furthermore, when used in this disclosure, the term "or" is not intended to be an exclusive or.

[0181] In this disclosure, where articles are added by translation, such as a, an, and the in English, the disclosure may include that the nouns following these articles are in the plural form.

[0182] As used in this disclosure, the terms "determining" and "determining" may encompass a wide variety of actions. "Determining" and "determining" may include, for example, judging, calculating, computing, processing, deriving, investigating, looking up, searching, inquiring (e.g., searching in a table, database, or other data structure), ascertaining, and the like. "Determining" and "determining" may also include receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in memory), and the like. Furthermore, "judgment" and "decision" can include regarding resolving, selecting, choosing, establishing, comparing, etc. as having been "judged" or "decided." In other words, "judgment" and "decision" can include regarding some action as having been "judged" or "decided." Furthermore, "judgment (decision)" can be interpreted as "assuming," "expecting," "considering," etc.

[0183] In the present disclosure, the term "A and B are different" may mean "A and B are different from each other." The term may also mean "A and B are each different from C." Terms such as "separate" and "coupled" may also be interpreted in the same way as "different."

[0184] Although the present disclosure has been described in detail above, it is clear to those skilled in the art that the present disclosure is not limited to the embodiments described herein. The present disclosure can be implemented in modified and altered forms without departing from the spirit and scope of the present disclosure as defined by the claims. Therefore, the description of the present disclosure is intended to be illustrative and does not have any limiting meaning on the present disclosure. [Explanation of symbols]

[0185] 10. Wireless communication systems 20 NG-RAN 50 wireless communication nodes 51 Radio Communication Department 53 NW IF Department 55 Lower node connection 57 Control Unit 100 wireless communication nodes 110 Radio Communication Department 150 wireless communication nodes 170 Upper node connection part 180 Lower Node Connection 190 Control Unit 200 UE 1001 processor 1002 memory 1003 Storage 1004 Communication equipment 1005 Input Device 1006 Output Device 1007 Bus

Claims

1. Link that indicates the link direction of the time resource allocated to the wireless link with the subordinate node The network display is the first and second upper nodes connected by the dual connectivity. a receiving unit for receiving the signals from the The first higher-level node and the second higher-level node transmit the time resource to each other. When a link indication is received, the first higher node operates in accordance with the link indication received from the first higher node. A control unit that operates Equipped with the first upper node is a master cell group, and the second upper node is a secondary cell group; The wireless communication node, wherein the receiving unit receives slot format information as the link indication from at least one of the first upper node and the second upper node.

2. A link of time resources allocated by a wireless communication node to a wireless link with a subordinate node The link indication indicating the direction is displayed on the first higher node, which is the destination of the dual connectivity. and a second higher-level node, respectively; The wireless communication node receives the time from both the first upper node and the second upper node. When the link indication for the inter-node resource is received, the previous link indication received from the first upper node is Steps to operate according to the link display Including, the first upper node is a master cell group, and the second upper node is a secondary cell group; The wireless communication method, wherein the receiving step receives slot format information as the link indication from at least one of the first higher-level node and the second higher-level node.

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