Wireless radio communication node and radio communication method

Abstract

To provide a wireless communication node and a wireless communication method for configuring wireless access and wireless backhaul.SOLUTION: In a wireless communication system, a wireless communication node (100B) receives resource information indicating a type of resources allocated to a wireless link with a lower node from a network, and sets the wireless link on the basis of resource information, and receives the resource information indicating the type of a time resource in a time direction and the type of a frequency resource in a frequency direction for at least a part of the time resources or the resource information indicating the type of the resource for each combination of a position in the time direction and the position in the frequency direction for at least a part of the time resources.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present disclosure relates to a wireless communication node 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] 3GPP Release 17 is planned to support simultaneous transmission and reception using frequency division multiplexing (FDM) between the wireless link (Link_parent) between the parent node and IAB node, i.e., MT, and the wireless link (Link_child) between the IAB node and child node, i.e., DU. [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 Summary of the Invention

[0007] In order to realize simultaneous transmission and reception in MT and DU using FDM, it may be possible to specify that the network transmits resource information indicating the type of resource in the time and frequency directions (Hard / Soft / NA (Not Available) etc.) to the IAB node. However, when TDM (Time Division Multiplexing) and FDM coexist, it is necessary to overcome backward compatibility issues, such as dealing with cases where they are not supported by previous specifications.

[0008] Therefore, the following disclosure has been made in consideration of this situation, and aims to provide a wireless communication node that can perform appropriate simultaneous transmission and reception using FDM between MT and DU even when it coexists with TDM.

[0009] One aspect of the present disclosure is a wireless communication node (wireless communication node 100B) that includes a receiver (wireless receiver 162) that receives resource information from a network indicating types of resources to be allocated to a wireless link with a lower node, and a control unit (control unit 190) that sets the wireless link based on the resource information, wherein the receiver receives the resource information indicating types of time resources in the time direction and types of frequency resources in the frequency direction for at least some of the time resources, or the resource information indicating the types of resources for each combination of position in the time direction and position in the frequency direction for at least some of the time resources.

[0010] One aspect of the present disclosure is a wireless communication node (wireless communication node 100B) that includes a receiver (wireless receiver 162) that receives, from a network, resource information indicating types of resources to be allocated to a wireless link with a lower node, and a controller (controller 190) that sets the wireless link based on the resource information, wherein the receiver receives the resource information indicating types of time resources in the time direction and types of frequency resources in the frequency direction for at least some of the time resources, or the resource information indicating, for at least some of the time resources, the resource types for each combination of a position in the time direction and a position in the frequency direction. [Brief explanation of the drawings]

[0011] [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 diagram showing an example of the basic configuration of the IAB. [Figure 3] FIG. 3 is a functional block diagram of the wireless communication node 100A. [Figure 4] FIG. 4 is a functional block diagram of the wireless communication node 100B. [Figure 5A] FIG. 5A is a diagram showing an example of frequency resource usage of a DU serving cell and an MT serving cell based on Assumption 1. [Figure 5B] FIG. 5B is a diagram showing an example of frequency resource usage of the DU serving cell and the MT serving cell based on Assumption 2. [Figure 5C] FIG. 5C is a diagram showing an example of frequency resource usage of the DU serving cell and the MT serving cell based on Assumption 3. [Figure 6] FIG. 6 is a diagram showing a schematic communication sequence relating to the setting of DU resources of an IAB node. [Figure 7A] FIG. 7A is a diagram illustrating an example of DU resource configuration according to option 1. [Figure 7B] FIG. 7B is a diagram illustrating an example of DU resource configuration according to option 2. [Figure 8] FIG. 8 is a diagram illustrating the assumed case 1. [Figure 9] FIG. 9 is a diagram illustrating the assumed case 2. [Figure 10] FIG. 10 is a diagram showing Case 1 and Case 2. [Figure 11] FIG. 11 is a diagram showing an example (Alt. 1) in which the type of DU frequency / TF resource (H / S / NA) is set only when a soft symbol is set. [Figure 12] FIG. 12 is a diagram showing an example (Alt. 2) in which the time at which the DU frequency / TF resource type (H / S / NA) is set is determined by a new setting. [Figure 13] FIG. 13 is a diagram showing another example. [Figure 14] FIG. 14 is a diagram illustrating an example (Case 1) of dynamic indication of availability for RBG per slot per D / U / F resource type. [Figure 15] FIG. 15 is a diagram showing an example (Case 2) of dynamic indication of availability per slot per D / U / F resource type. [Figure 16] FIG. 16 is a diagram showing an example in which Case 1 and Case 2 coexist. [Figure 17] FIG. 17 is a diagram showing an example in which dynamic indication of DU symbols and dynamic indication of DU frequency / TF resources are shown for different slots. [Figure 18] FIG. 18 is a diagram showing an example of a signaling structure of DCI format 2_5. [Figure 19] FIG. 19 is a diagram illustrating an example of the hardware configuration of the CU 50, the wireless communication nodes 100A to 100C, and the UE 200. As shown in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0012] 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.

[0013] (1) Overall configuration of the wireless communication system 1 is a diagram showing an overall schematic 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.

[0014] Specifically, the wireless communication system 10 includes wireless communication nodes 100A, 100B, and 100C, and a user equipment 200 (hereinafter, referred to as UE 200).

[0015] The wireless communication nodes 100A, 100B, and 100C can establish wireless access with the UE 200 and wireless backhauls (BH) between the wireless communication nodes. Specifically, backhauls (transmission paths) are established by wireless links between the wireless communication nodes 100A and 100B, and between the wireless communication nodes 100A and 100C.

[0016] 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).

[0017] 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.

[0018] The wireless communication node 100A is connected to an NR radio access network (NG-RAN) and a core network (Next Generation Core (NGC) or 5GC) via a wired transmission path such as fiber transport. The NG-RAN / NGC includes a Central Unit 50 (hereinafter, CU50), which is a communication node. The NG-RAN and NGC may be collectively referred to simply as the "network."

[0019] The CU 50 may be configured using any one or a combination of the UPF, AMF, and SMF described above, or may be a gNB-CU as described above.

[0020] Fig. 2 is a diagram showing a basic configuration example of an IAB. As shown in Fig. 2, in this embodiment, the wireless communication node 100A constitutes a parent node in the IAB, and the wireless communication node 100B (and the wireless communication node 100C) constitutes an IAB node in the IAB.

[0021] In addition, the parent node may be called an upper node in relation to the IAB node. Furthermore, the parent node may be called an IAB donor. Furthermore, the IAB node may be called a lower node in relation to the parent node.

[0022] A child node in the IAB is configured by another wireless communication node not shown in Fig. 1. Alternatively, the UE 200 may configure the child node. The IAB node may be called an upper node in relation to the child node, and the child node may be called a lower node in relation to the IAB node.

[0023] A wireless link is established between the parent node and the IAB node. Specifically, a wireless link called Link_parent is established.

[0024] A wireless link is established between the IAB node and the child node. Specifically, a wireless link called Link_child is established.

[0025] Such a wireless link established between wireless communication nodes may be called a wireless backhaul link. Link_parent is composed of a DL Parent BH in the downlink direction and a UL Parent BH in the uplink direction. Link_child is composed of a DL Child BH in the downlink direction and a UL Child BH in the uplink direction.

[0026] 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 configured by a DL access in the downlink direction and a UL access in the uplink direction.

[0027] An IAB node has a Mobile Termination (MT), which is a function for connecting to a parent node, and a Distributed Unit (DU), which is a function for connecting to a child node (or UE 200). Although omitted in Fig. 2, the parent node and child node also have an MT and a DU.

[0028] 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.

[0029] Flexible time-resource (F) is a time 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 connecting 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 a parent node.

[0030] Furthermore, in the case of Soft (S), the radio resources to be notified can be determined based on whether they are indicated as available (IA) or not available (INA).

[0031] "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.

[0032] Although the IAB configuration example shown in Fig. 2 uses CU / DU division, the IAB configuration is not necessarily limited to this configuration. For example, the IAB may be configured by tunneling using GPRS Tunneling Protocol (GTP)-U / User Datagram Protocol (UDP) / Internet Protocol (IP) for the wireless backhaul.

[0033] The main advantage of such IAB is that it allows flexible and dense deployment of NR cells without densifying the transport network. IAB can be applied to various scenarios, such as outdoor small cell deployment, indoor deployment, and even support for mobile relay (e.g., in buses and trains).

[0034] The IAB may also support NR-only standalone (SA) deployments, as shown in Figures 1 and 2, or non-standalone (NSA) deployments that include other RATs (such as LTE).

[0035] 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).

[0036] 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. Also, 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 wireless backhaul (BH) only, UL-F-DL, etc. may be applied.

[0037] In this embodiment, in particular, a case where simultaneous operation of DU and MT of an IAB node is realized using TDM / FDM will be described. Note that both TDM and FDM are not always supported, and it is assumed that only one of them is supported.

[0038] (2) Functional block configuration of wireless communication system Next, the functional block configuration of the wireless communication node 100A and the wireless communication node 100B that configure the wireless communication system 10 will be described.

[0039] (2.1) Wireless communication node 100A 3 is a functional block diagram of a wireless communication node 100A constituting a parent node. As shown in FIG. 3, the wireless communication node 100A includes a wireless transmitting unit 110, a wireless receiving unit 120, a NW IF unit 130, an IAB node connecting unit 140, and a control unit 150.

[0040] The wireless transmission unit 110 transmits a wireless signal conforming to the 5G to 6G specifications. The wireless reception unit 120 also transmits a wireless signal conforming to the 5G to 6G specifications. In this embodiment, the wireless transmission unit 110 and the wireless reception unit 120 perform wireless communication with the wireless communication node 100B constituting the IAB node.

[0041] In this embodiment, the wireless communication node 100A has the functions of MT and DU, and the wireless transmitting unit 110 and the wireless receiving unit 120 also transmit and receive wireless signals in accordance with MT / DU.

[0042] The radio transmitting unit 110 and the radio receiving unit 120 can perform radio communication in accordance with half-duplex and full-duplex. Furthermore, the radio transmitting unit 110 and the radio receiving unit 120 can perform radio communication in accordance with FDM and SDM, as well as TDM (TDD).

[0043] The NW IF unit 130 provides a communication interface that realizes connection with the NGC side, etc. For example, the NW IF unit 130 may include interfaces such as X2, Xn, N2, and N3.

[0044] The IAB node connection unit 140 provides an interface and the like that realizes connection with an IAB node (or a child node including a UE). Specifically, the IAB node connection unit 140 provides the function of a Distributed Unit (DU). In other words, the IAB node connection unit 140 is used for connection with an IAB node (or a child node).

[0045] An IAB node may be described as a RAN node that supports wireless access for the UE 200 and wirelessly backhauls access traffic, and a parent node, i.e., an IAB donor, may be described as a RAN node that provides the UE's interface to the core network and wireless backhaul functionality to the IAB node.

[0046] The control unit 150 controls each functional block constituting the wireless communication node 100 A. In particular, in this embodiment, the control unit 150 controls the setting of a wireless link with the IAB node (wireless communication node 100 B).

[0047] Specifically, the control unit 150 can determine DU resources (which may also be called radio resources) to be allocated to the radio link established via the functionality of the DU for the IAB node.

[0048] The resources may include time resources in the time direction and frequency resources in the frequency direction.

[0049] A time resource is a resource in the time direction, and may be a unit such as a symbol, a slot, or a subframe. The time direction may also be called a time domain, a symbol period, or a symbol time. A symbol may also be called an Orthogonal Frequency Division Multiplexing (OFDM) symbol.

[0050] The frequency resource is a resource in the frequency direction, and may be a resource block, a resource block group, a subcarrier, etc. The frequency direction may also be called a frequency domain, a resource block, a resource block group, a subcarrier, a BWP (Bandwidth part), etc.

[0051] (2.2) Wireless communication node 100B 4 is a functional block diagram of a wireless communication node 100B constituting an IAB node. As shown in FIG. 4, the wireless communication node 100B includes a wireless transmitting unit 161, a wireless receiving unit 162, an upper node connecting unit 170, a lower node connecting unit 180, and a control unit 190.

[0052] As such, the wireless communication node 100B has functional blocks similar to those of the wireless communication node 100A (parent node) described above, but differs in that it has an upper node connection unit 170 and a lower node connection unit 180, and in the functions of the control unit 190.

[0053] The wireless transmitting unit 161 transmits a wireless signal conforming to the 5G to 6G specifications. The wireless receiving unit 162 also transmits a wireless signal conforming to the 5G to 6G specifications. In this embodiment, the wireless transmitting unit 161 and the wireless receiving unit 162 perform wireless communication with the wireless communication node 100A constituting the parent node, and wireless communication with a child node (including the UE 200).

[0054] The wireless transmitting unit 161 and the wireless receiving unit 162, like the wireless communication node 100A (parent node), can perform wireless communication according to half-duplex and full-duplex, and further, wireless communication according to FDM and SDM as well as TDM (TDD).

[0055] In this embodiment, the wireless receiving unit 162 can receive, from the network, resource information indicating the type of resource allocated to a wireless link with another wireless communication node constituting a child node in relation to a lower node, specifically, the UE 200 or an IAB node. In this embodiment, the wireless receiving unit 162 constitutes a receiving unit.

[0056] Specifically, the wireless receiving unit 162 can receive resource information indicating the type of DU resource (e.g., H / S / NA, IA / INA) allocated to the wireless link set via the function of the DU for the lower node. The resource information may be transmitted from the CU 50 in accordance with an F1-AP (Application) protocol applied to the F1 interface between the CU and the DU, or may be transmitted from the network (specifically, gNB) by signaling of the radio resource control layer (RRC).

[0057] The resource information received by the radio receiving unit 162 may indicate the type of time resource (H / S(IA / INA) / NA) and / or the type of frequency resource (H / S(IA / INA) / NA).

[0058] Specifically, the resource information can indicate the resource type (Hard, Soft (IA / INA), or NA) for each unit in the time direction (e.g., symbol) and the resource type (Hard, Soft (IA / INA), or NA) for each unit in the frequency direction (e.g., subcarrier). Note that the resource information indicating at least the type of time resource and the resource information indicating at least the type of frequency resource may be specified (received) multiple times.

[0059] As mentioned above, the unit in the time direction is not limited to a symbol, but may be a slot made up of multiple symbols (for example, 14 symbols).

[0060] The resource information may also indicate frequency resources based on resource blocks (RBs) or resource block groups (RGBs). One RB may be interpreted as 12 resource elements (REs) in the frequency domain, and one RE may be interpreted as the smallest unit of a resource grid consisting of one subcarrier in the frequency domain (one OFDM symbol in the time domain).

[0061] Furthermore, as will be described later, the resource information may indicate the type of time resource and the type of frequency resource separately, or may indicate a combination of the type of time resource and the type of frequency resource.

[0062] Alternatively, the resource information may indicate the type of resource for each combination of a position in the time direction and a position in the frequency direction. For example, the resource information may indicate the resource type (Hard, Soft, NA, and / or IA / INA) for each combination of a symbol position (which may be specified by a symbol number) and a subcarrier position (which may be specified by a subcarrier number or an RB / RBG index) (that is, for each combination (which may be expressed as a set) of a time resource and a frequency resource).

[0063] Even when the resource type is indicated for each combination (set) of time resources and frequency resources in this manner, the resource information may indicate the resource type (Hard, Soft, or NA) for each combination of time resources and frequency resources defined by a unit in the time direction (e.g., a symbol) and a unit in the frequency direction (e.g., a subcarrier).

[0064] Furthermore, the resource information may collectively indicate a plurality of resources of the same type that are consecutive in the time direction or the frequency direction (or at least one of them).

[0065] For example, the resource information may indicate the slot number at which the same type of resource (eg, Hard) starts in the time direction, and the number of slots in which the same type of resource continues (eg, two slots).

[0066] In this embodiment, a case where TDM and FDM are mixed will be described in particular. Therefore, the resource information does not necessarily indicate the types of frequency resources at all times. In other words, the resource information indicates the types of frequency resources in the frequency direction for at least some of the time resources. Alternatively, the resource information indicates the types of resources for each combination of a position in the time direction and a position in the frequency direction for at least some of the time resources. Furthermore, as described above, the types of time resources may be indicated in the resource information indicating the types of frequency resources, or the types of time resources may be indicated in other resource information. Furthermore, some of the time resources for which the types of frequency resources are indicated are not necessarily notified (received) from the network, but may be defined by specifications, etc. Specific examples of resource information will be described further below.

[0067] 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.

[0068] 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 that constitutes an upper node.

[0069] The lower node connection unit 180 provides an interface that realizes connection with a node lower than the IAB node. Note that the 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.

[0070] 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.

[0071] The control unit 190 controls each functional block constituting the wireless communication node 100 B. In particular, in this embodiment, the control unit 190 sets up a wireless link based on resource information received from a network (which may include the CU 50).

[0072] Specifically, the control unit 190 can determine resources (DU resources) to be allocated to radio links with other radio communication nodes that constitute child nodes in relation to a lower node, specifically, UE 200 or an IAB node, based on the type of time resource (H / S / NA, IA / INA) and the type of frequency resource (H / S / NA, IA / INA) indicated by the resource information.

[0073] Various channels may be transmitted and received via the wireless link to which the DU resource is allocated.

[0074] The channels include a control channel and a data channel, such as a physical downlink control channel (PDCCH), a physical uplink control channel (PUCCH), a physical random access channel (PRACH), and a physical broadcast channel (PBCH).

[0075] The data channels include a physical downlink shared channel (PDSCH) and a physical uplink shared channel (PUSCH).

[0076] The reference signal includes 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), and the signal includes a channel and a reference signal. Furthermore, the data may refer to data transmitted via a data channel.

[0077] Uplink Control Information (UCI) is UL control information, and is the counterpart of Downlink Control Information (DCI). UCI is transmitted via PUCCH or PUSCH. UCI may include SR (Scheduling Request), HARQ (Hybrid Automatic repeat request) ACK / NACK, CQI (Channel Quality Indicator), etc.

[0078] DCI is DL control information. DCI is transmitted via PDCCH. DCI may include schedule information for PDSCH and PUSCH.

[0079] (3) Operation of the wireless communication system Next, a description will be given of the operation of the wireless communication system 10. Specifically, the description will be given of the operation related to simultaneous transmission and reception using TDM / FDM between an IAB node (wireless communication node 100B) and a parent node (wireless communication node 100A) via a wireless link (parent link (Link_parent)) and a child node (UE 200 or another wireless communication node constituting the child node) via a wireless link (child link (Link_child)).

[0080] (3.1) Premise 3GPP Release 16 specifies resource multiplexing by TDM between a parent link and a child link.

[0081] The TDM DU resources can be configured semi-statically and / or dynamically. In each serving cell formed by an IAB node DU, the IAB node DU can configure the resource type (Hard, Soft (IA / INA), or NA) for the symbols in each slot.

[0082] This setting can be realized using a GNB-DU RESOURCE CONFIGURATION, which is an F1-AP message transmitted from the CU 50, or the like.

[0083] Also, when a DU resource (symbol) is Soft, dynamic indication (IA or INA) can be performed explicitly and implicitly.

[0084] Specifically, when a DL, UL or Flexible symbol is configured as Soft, an IAB node DU may transmit and receive, or either transmit or receive, within the symbol only if:

[0085] IAB node MT does not transmit or receive at that symbol (implicit instruction) Since the IAB node MT transmits or receives at the symbol, the use of the symbol by the IAB node DU does not change the transmission or reception at the symbol (implicit instruction). The IAB node MT detects DCI format 2_5 (see 3GPP TS38.212 Chapter 7.3) and indicates that the symbol is available by the Availability Indicator (AI) index field value (explicit indication).

[0086] Regarding DU resources in the frequency domain, the CU 50 can set the frequency information and transmission bandwidth of the serving cell formed by the DU (hereinafter referred to as the DU serving cell) via F1-AP signaling using the Served Cell Information information element (IE). The Served Cell Information can include NR Frequency Info and Transmission Bandwidth IEs.

[0087] Table 1 shows an example of the configuration of the Transmission Bandwidth defined in 3GPP TS38.473 Chapter 9.3.1.15.

[0088] [Table 1]

[0089] Transmission Bandwidth is used to indicate the transmission bandwidth of UL or DL.

[0090] Table 2 shows an example of the configuration of NR Frequency Info specified in 3GPP TS38.473 Chapter 9.3.1.17.

[0091] [Table 2]

[0092] NR Frequency Info can define the carrier frequencies used within a cell for a specific direction (UL or DL) in FDD, both directions in TDD, or a Supplementary Uplink (SUL) carrier.

[0093] In 3GPP Release 16, the donor CU and parent node can recognize the multiplexing capability (whether TDM is required) for any MT component carrier (CC) or DU cell pair between the MT and DU of the IAB node.

[0094] In addition, an indication of the multiplexing capability in the case where the MT and DU of an IAB node are non-TDM is additionally provided for each transmit / receive direction combination (per pair of MT CC or DU cells) as follows:

[0095] MT transmission / DU transmission MT transmission / DU reception MT reception / DU transmission MT reception / DU reception Regarding simultaneous transmission and reception on the parent link and the child link by resource multiplexing between the parent link and the child link using FDM, the following assumptions 1 to 3 are possible.

[0096] 5A, 5B, and 5C show examples of frequency resource usage of the DU serving cell and the MT serving cell based on Assumptions 1 to 3.

[0097] (Assumption 1): The DU serving cell and the MT serving cell perform simultaneous transmission and reception (which may mean simultaneous transmission or simultaneous reception) using non-overlapping resources in the frequency direction.

[0098] As shown in FIG. 5A, the DU transmission band does not overlap with the BWP of the MT serving cell (which may be set by signaling to the RRC layer).

[0099] In addition, the DU serving cell and the MT serving cell may refer to the cells formed by the DU and MT of the IAB node, respectively.

[0100] · (Assumption 2): The DU serving cell and the MT serving cell transmit and receive simultaneously using resources that completely overlap in the frequency direction.

[0101] · (Assumption 3): The DU serving cell and the MT serving cell transmit and receive simultaneously using resources that partially overlap in the frequency direction.

[0102] In the case of (Assumption 1), the bandwidths of the DU serving cell and the MT serving cell are configured to not overlap. Therefore, if the multiplexing capability of the IAB node supports simultaneous transmission and reception of the pair of the DU serving cell and the MT serving cell, the MT and DU of the IAB node can perform simultaneous transmission and reception as long as the transmission direction is consistent with the multiplexing capability. In this case, no additional signaling for resource multiplexing in the frequency domain is required.

[0103] In the case of (Assumption 2) or (Assumption 3), even if an IAB node has the capability to support simultaneous transmission and reception between a pair of a DU serving cell and an MT serving cell, the MT and DU of the IAB node can perform simultaneous transmission and reception only if the parent node and the IAB node have a common understanding that orthogonal frequency resources are used by the MT and DU.

[0104] In light of the specifications of 3GPP Release 16, this embodiment realizes semi-static or dynamic resource multiplexing between a parent link and a child link by FDM. Note that this embodiment is premised on the assumption that FDM is not always performed at all times, and will particularly describe a method for performing appropriate simultaneous transmission and reception even in such a case.

[0105] (3.2) Operation overview In the following, we will explain semi-static resource multiplexing using FDM, and also dynamic resource multiplexing. Note that the operations described below are not limited to (Assumption 2) or (Assumption 3), and may also be applied to (Assumption 1).

[0106] The operational example described below enables simultaneous transmission and reception according to FDM by the MT and DU of an IAB node within the same frequency band (which may also be simply called a band or frequency range), i.e., frequency division duplex (FDD).

[0107] To support FDD operation by MT and DU in IAB nodes, the following two options may be configured. Note that these options are for semi-static configuration, but dynamic indication may also be provided (details will be explained later).

[0108] (Option 1): Semi-statically set whether or not the IAB node can use DU resources (H / S / NA) for each frequency axis / time axis (each unit in the frequency direction / time direction).

[0109] (Option 2): For each matrix (combination) of frequency / time axes (units in the frequency direction / time direction), the availability (H / S / NA) of DU resources of IAB nodes is set semi-statically.

[0110] (Operation example 1a): This is an operation example (Option 1a) related to Option 1, in which H / S / NA in the frequency direction is set for each time resource (the H / S / NA setting in the time direction in 3GPP Release 16 is not required).

[0111] In Option 1a, each frequency resource (RB group / set) can be configured as the H / S / NA of each slot of each D / U / F resource type (which has the same granularity as the H / S / NA of Rel-16).

[0112] For each DU serving cell, each frequency resource may be set to Hard, Soft, or NA for each time unit.

[0113] As in the first operational example, the H / S / NA settings for the DU symbols in Rel-16 are reused.

[0114] An IAB node may determine whether a DU of the IAB node can use a TF resource based on both the H / S / NA setting of the DU symbol according to Rel-16 and the H / S / NA setting of the frequency resource in Option 1.

[0115] Here, it differs from Option 1 in that different resource types (H / S / NA) can be set for frequency resources if the time unit (e.g., symbol) is different (see the circled area in the figure). On the other hand, the H / S / NA setting of frequency resources for each time unit is the same as in Operation Example 1. Here, whether or not DU resources can be used for transmission and reception is determined according to the H / S / NA settings in the time and frequency directions, as in Figure 7A.

[0116] The time unit may be multiple subframes, subframes, multiple slots, slots, symbols, symbol groups, or D / U / F within each slot.

[0117] The granularity may be predefined in the 3GPP specifications or may be set by the network. Similarly, the periodicity in the time domain may be predefined in the 3GPP specifications or may be set by the network. The set resource type may be repeated at the periodicity.

[0118] (Example 2): Example of operation related to option 2 (Option 2-1): Configure resources configured as H / S / NA together (Option 2-1-1): Set for each frequency axis / time axis (Option 2-1-2): Set the resource indicated by the frequency axis / time axis matrix by bitmap for each H / S / NA (Example 2-2): Set the H / S / NA of each resource in the order of frequency, time, or time, frequency.

[0119] The size of the RBG may be predefined by 3GPP specifications or may be set by signaling such as RRC. Alternatively, a default resource type may be set, for example, a default value (H / S / NA) for each RB / RBG. Alternatively, only two of the resource types (H / S / NA) may be set, for example (H / S).

[0120] (3.3) Example of operation First, the overall sequence for setting DU resources of an IAB node will be described. Figure 6 shows a schematic communication sequence for setting DU resources of an IAB node.

[0121] 6, the CU 50 transmits resource information (e.g., GNB-DU RESOURCE CONFIGURATION) including the type of DU resource of the IAB node to the wireless communication node 100B (IAB node) (S10). Note that the GNB-DU RESOURCE CONFIGURATION is a type of F1-AP message and is specified in 3GPP TS38.473.

[0122] In response to receiving the GNB-DU RESOURCE CONFIGURATION, the wireless communication node 100B, specifically the DU of the IAB node, returns a GNB-DU RESOURCE CONFIGURATIONACKNOWLEDGE to the CU 50 (S20). Note that the GNB-DU RESOURCE CONFIGURATION and the GNB-DU RESOURCE CONFIGURATION ACKNOWLEDGE are types of F1-AP messages, and are defined in 3GPP TS38.473.

[0123] The radio communication node 100B sets the DU resource based on the type of DU resource (H / S / NA) included in the resource information (GNB-DU RESOURCE CONFIGURATION) (S30).

[0124] Specifically, the wireless communication node 100B determines the time resources and (at least a part of) the frequency resources to be allocated to the child link (Link_child) based on the type of DU resource (H / S / NA). Note that the child link may be called a DU serving cell as described above.

[0125] The wireless communication node 100A (parent node) and the wireless communication node 100B set a parent link (Link_parent) and a child link (Link_child) (S40). As described above, in this operation example, transmission and reception are performed between the parent link and the child link in accordance with TDM / FDM (including the case where only a part of the TDM / FDM is used).

[0126] 7A shows an example of DU resource configuration according to option 1. FIG. 7B shows an example of DU resource configuration according to option 2.

[0127] As described above, in Option 1, the H / S / NA of frequency resources can be configured for each DU serving cell, but the DU symbol (time resource) configuration method of 3GPP Release 16 (hereinafter referred to as Rel-16) may be reused in Option 1. Whether a DU can use time-frequency (TF) resources must be determined from both the H / S / NA configuration of the DU symbol (i.e., time resource) in Rel-16 and the H / S / NA configuration of the frequency resource in Option 1.

[0128] As shown in FIG. 7A, the type of each DU resource (Hard, Soft, or NA) is determined in the time direction according to the H / S / NA setting of Rel-16, and in the frequency direction according to the H / S / NA setting of Option 1.

[0129] That is, if the settings in both the time direction and frequency direction are Hard (H), the DU resource can be used for transmission or reception, and if the setting in either the time direction or frequency direction is NA, the DU resource cannot be used for transmission or reception.In other cases (if the setting in either the time direction or frequency direction, or both, is Soft (S)), the parent node notifies the availability of the DU resource for transmission or reception using DCI format 2_5.

[0130] Also, as mentioned above, in Option 2, TF resources can be configured as Hard, Soft, or NA for each DU serving cell. In Option 2, individual H / S / NA configuration for Rel-16 DU symbols is not required. Whether a DU can use TF resources can be determined directly according to the configuration in Option 2.

[0131] (3.3.1) Example 1 Option 1 may further have the following sub-options:

[0132] (Option 1-1): Indicates a set of frequency resources and the resource type of the set of frequency resources.

[0133] (Option 1-2): Indicates a sequence of resource types, where each resource type corresponds to a frequency resource within the DU transmission band.

[0134] The granularity of the frequency resource may be RB or RBG (RB / RBG).

[0135] The DU resource display may be for the DU transmission band. In this example, resource blocks (RBs) #1, 6, and 10 are set to Hard, RBs #5 and 7 are set to Soft, and RBs #4, 8, and 9 are set to NA.

[0136] In the case of option 1-1, the numbers of the RBs included in each set (#1 to #3) of frequency resources and the resource types (H / S / NA) are indicated.

[0137] In the case of option 1-2, the sequence of resource types (H / S / NA) along the RB order (Index) (H, S, NA, NA, S, H, S, NA, NA, H) is shown.

[0138] (3.3.2) Example 2 In this operation example, it is assumed that the IAB node configures the H / S / NA of the IAB-DU in both the time direction and the frequency direction (or the time-frequency direction). Here, Fig. 8 is a diagram showing assumed case 1. Fig. 9 is a diagram showing assumed case 2.

[0139] The IAB node assumes Rel-16 configuration of H / S / NA for DU symbols for each slot / each DUF (Downlink / Uplink / Free) resource type at slot / symbol level (see case 2 in Figure 9). Alternatively, the IAB node assumes new configuration of H / S / NA for DU frequency (freq.) / TF resource for each slot / each DUF resource type at slot / symbol level (see case 1 in Figure 8). Here, the Rel-16 configuration of H / S / NA for DU symbols may mean H / S / NA for each D / U / F resource type. Furthermore, the H / S / NA setting for the DU frequency (freq.) / TF resource may refer to the H / S / NA per slot per RBG per D / U / F resource type, the H / S / NA per slot per RBG, or the H / S / NA per symbol per RBG (H / S / NA per RB group (N RBs) per slot per D / U / F resource type, or per RBG per slot or per RBG per symbol). Furthermore, the type (kind) of the frequency / TF resource may refer to the resource type (H / S / NA) in the frequency direction during a certain period of time, or the resource type (H / S / NA) for each combination (TF) of a time (T) position and a frequency (F) position during a certain period of time.

[0140] Note that whether the resource type "H / S / NA" is configured for DU symbols or DU frequency / TF can be distinguished by higher layer parameters (e.g., "FDM operation"). For example, if "FDM operation" is enabled, the IAB node assumes new configurations of H / S / NA for DU frequency / TF resources. On the other hand, if "FDM operation" is not enabled, the IAB node assumes the R 16 configuration of H / S / NA for DU symbols.

[0141] In this embodiment, a case where FDM and TDM are mixed will be particularly assumed, and an operation in the case where the above-mentioned Case 1 and Case 2 are mixed will be described. Fig. 10 is a diagram showing Case 1 and Case 2.

[0142] As shown in Figure 10, the IAB node assumes both the Rel-16 configuration of H / S / NA for DU symbols and the new configuration of H / S / NA for DU frequency / TF resources for each slot / symbol.

[0143] (3.3.3) Example 3 In this example operation, the IAB node assumes the Rel-16 configuration of H / S / NA for DU symbols for each slot / symbol, and also assumes new configurations of H / S / NA for DU frequency / TF resources for some slots / DUF resource types at the slot / symbol level.

[0144] Here, FIG. 11 is a diagram showing an example (Alt. 1) in which the type of DU frequency / TF resource (H / S / NA) is set only when a soft symbol is set.

[0145] As shown in Figure 11, in this example (Alt. 1), whether the type (H / S / NA) for the DU frequency / TF resource is configured for each slot, for each D / U / F resource type in each slot, or for each symbol is determined (implicitly) by a predefined rule. For example, as shown in Figure 11, in the Release 16 configuration, the specification (predefined / predefined) may be that the H / S / NA resource type is configured in the frequency direction only for DU symbols designated as soft. Thus, in this example, the DU frequency / TF resource type (H / S / NA) is configured only for a specific resource type (H / S / NA) of the DU symbol (e.g., only for DU soft symbols or only for DU hard / soft symbols).

[0146] Here, FIG. 12 is a diagram showing an example (Alt. 2) in which the time at which the DU frequency / TF resource type (H / S / NA) is set is determined by a new setting.

[0147] As shown in Figure 12, in this example (Alt.2), for each slot, for each D / U / F resource type of each slot, or for each symbol, it is explicitly set whether the type (H / S / NA) for the DU frequency / TF resource is set.

[0148] For example, as shown in the lower diagram of Figure 12, one bit is provided for each slot, for each D / U / F resource type of each slot, or for each symbol. If "0" ("FDM") is set, the UE may assume that H / S / NA configuration is performed for the DU frequency / TF resource. On the other hand, if "1" ("TDM") is set, the UE does not assume that H / S / NA configuration is performed for the DU frequency / TF resource. As another example, "0" and "1" may be interchanged.

[0149] As described above, the IAB node may assume that all time resources are configured in the time direction and some time resources are configured in the frequency direction (or time-frequency direction). Furthermore, as described above, the following modifications Alt. 1 and 2 may be implemented. Alt.1: Specifies the time resource for which the frequency direction (or time-frequency direction) is configured Alt.2: The time resource for which the frequency direction (or time-frequency direction) is configured is notified.

[0150] As another example, the IAB node may consider a new configuration signaling, where FIG. 13 illustrates another example, in which H / S / NA of some slots / DUF resource types / symbols at slot level are configured for DU frequency / TF resources, and H / S / NA of other slots / DUF resource types / symbols at slot level are configured for DU symbols.

[0151] As described above, whether the resource type (H / S / NA) is set for each symbol or for the DU frequency / TF resource may be determined by a predefined rule, may be explicitly set for each slot, or may be (implicitly) determined from the resource type (D / U / F) of each slot or each symbol.

[0152] (3.4) Dynamic Indication Examples In the above options, an example in which a semi-static setting is made for the resource type has been described, but this is not limiting and dynamic instructions may also be made. For example, the semi-static resource type setting "H / S / NA" in the above example may be replaced with the dynamic instruction "IA / INA."

[0153] Here, Figure 14 is a diagram showing an example of dynamic indication for DU frequency / TF resource. As shown in Figure 14, within the framework of DCI format 2_5, soft resource availability in IAB FDM may be dynamically indicated (IA / INA). The following two options may be adopted: Option 1-2: Reuse DCI format 2_5 to indicate the availability of each soft frequency resource Proposal 2-2: Reuse DCI format 2_5 to indicate the availability of each soft TF (time-frequency) resource

[0154] In this operation example, we will explain the case where the IAB assumes both of the above options. Regarding dynamic indication, the IAB node assumes that notification is made in the time direction in some time resources and in the frequency direction (or time-frequency direction) in other time resources. The following options may also be adopted: Alt.1: Specifies whether the dynamic indication corresponds to the time direction or the frequency direction (or the time-frequency direction). Alt.2: Dynamic indication is notified whether it corresponds to the time direction or the frequency direction (or the time-frequency direction)

[0155] An IAB node expects a dynamic indication of DU symbol availability (IA / INA) for some slots / symbols, while for other slots / symbols it expects a dynamic indication of DU frequency / TF resource availability.

[0156] In addition, the IAB node may assume one DCI that dynamically indicates resource availability for each slot / symbol. Here, if availability (IA / INA) for each DU frequency / TF resource per slot per D / U / F resource type is indicated, there is no need to indicate availability for the DU symbol. On the other hand, if availability is indicated for each DU symbol, there is no need to indicate availability for the DU frequency / TF resource (e.g., if a DU symbol is indicated as available (IA), all frequency / TF resources of that symbol may be considered available). In other words, there is no need to indicate availability for both the DU symbol and the DU frequency / TF resource.

[0157] Note that the dynamic indication of DU symbol availability may refer to the dynamic indication of availability per slot for each D / U / F resource type (IA / INA). Also, the dynamic indication for DU frequency / TF resources may refer to the dynamic indication of availability (IA / INA) per RB group (N RB), per slot, per D / U / F resource type, per RBG per slot, or per RBG per symbol. Note that IA means that it is indicated as available. INA means that it is unavailable or there is no explicit indication.

[0158] Either the IAB node assumes dynamic indication of DU symbol availability for each slot / symbol, or the IAB node assumes dynamic indication of DU frequency / TF resource availability for each slot / symbol.

[0159] For example, whether an IAB node assumes dynamic indication of DU symbol availability or dynamic indication of DU frequency / time-frequency (TF) resource availability may be determined by a higher layer parameter (e.g., "FDM"). If "FDM" is enabled, the IAB node assumes dynamic indication of each frequency / TF resource availability. On the other hand, if "FDM" is not enabled, the IAB node assumes dynamic indication of each symbol availability.

[0160] Here, Fig. 14 is a diagram showing an example (Case 1) of dynamic indication of availability for RBG per slot per D / U / F resource type. Fig. 15 is a diagram showing an example (Case 2) of dynamic indication of availability per slot per D / U / F resource type. In this operation example, it is assumed that the IAB node may coexist with both of these cases.

[0161] Figure 16 shows an example where Case 1 and Case 2 coexist. As shown in Figure 15, an IAB node assumes different D / U / F resource types. That is, an IAB node may assume either dynamic indication for DU symbols or dynamic indication for DU frequency / TF resources.

[0162] In this way, an IAB node may assume dynamic indication of DU symbol availability for some slots / some DUF resource types at slot / symbol level. Also, an IAB node may assume dynamic indication of DU frequency / TF resource availability for some other slots / some other DUF resource types at slot / symbol level. The following options may be adopted:

[0163] The dynamic indication of Alt.1 DU symbol availability or DU frequency / TF resource availability is determined by predefined rules for each slot, each D / U / F resource type in each slot, or each symbol. For example, it may be based on semi-static configuration. That is, if H / S / NA is configured for the DU symbol, the DU symbol availability is dynamically indicated, and if H / S / NA is configured for the DU frequency / TF resource, the DU frequency / TF resource availability is dynamically indicated.

[0164] Alt.2 Dynamic indication of DU symbol availability or dynamic indication of DU frequency / TF resource availability is explicitly configured for each slot, each D / U / F resource type of each slot, or each symbol. For example, one bit is provided for each slot, each D / U / F resource type of each slot, or each symbol, and when "0" ("FDM") is set, the UE may assume dynamic indication of DU frequency / TF resource availability. On the other hand, when "1" ("TDM") is set, the UE may assume dynamic indication of DU symbol availability. Note that in the above, "0" and "1" may be interchanged.

[0165] In this way, an IAB node may assume that dynamic indication is notified in the time direction in some time resources and in the frequency direction (or time-frequency direction) in other time resources, and may adopt the following options as described above. Alt.1: Specifies whether the dynamic indication corresponds to the time direction or the frequency direction (or the time-frequency direction). Alt.2: Dynamic indication is notified whether it corresponds to the time direction or the frequency direction (or the time-frequency direction)

[0166] Therefore, an IAB node can assume either dynamic indication of DU symbols or dynamic indication of DU frequency / TF resources for different slots, as shown in Figure 17. At slot level, dynamic indication of all D / U / F resource types is performed for DU symbols, and dynamic indication of all D / U / F resource types is performed for DU frequency / TF resources.

[0167] Here, Fig. 18 is a diagram showing an example of a signaling structure of DCI format 2_5. As shown in Fig. 18, the configuration of the Availability Indicator (AI) for the DU serving cell may include an indication indicating the availability of DU symbols, or an indication indicating the availability of DU frequencies / TF resources.

[0168] Note that the Indication may use the availability indication (mapping between resourceAvailability element and availability) for the DU symbol defined in Rel-16, as shown below. [Table 3]

[0169] Alternatively, for example, the availability indication for DU symbols (mapping between resourceAvailability element and availability) may be specified in a new table, as shown below. This is useful when different DUF resource types are used at slot level, and an IAB node can assume either dynamic indication for DU symbols or dynamic indication for DU frequency / TF resources. In this case, each indication may be configured for one DUF resource type. [Table 4]

[0170] (3.5) Examples of Combinations of Quasi-Static Settings and Dynamic Instructions The above-mentioned semi-static settings and dynamic instructions may be implemented in any combination. For example, one of the following options may be adopted: Semi-static: H / S / NA in time direction, Dynamic: Time and frequency direction Semi-static: frequency direction, Dynamic: time and frequency direction Semi-static: time and frequency direction, Dynamic: time and frequency direction

[0171] Specifically, for a slot / symbol, when the H / S / NA of the DU symbol is configured, a dynamic indication of the availability of the DU symbol and a dynamic indication of the availability of the DU frequency / TF resource may be assumed.

[0172] Also, for a slot / symbol, when the H / S / NA of the DU frequency / TF resource is configured, a dynamic indication of the availability of the DU symbol and a dynamic indication of the availability of the DU frequency / TF resource may be assumed.

[0173] Also, if for a slot / symbol both the H / S / NA of the DU symbol and the H / S / NA of the DU frequency / TF resource are configured, a dynamic indication of the availability of the DU symbol and a dynamic indication of the availability of the DU frequency / TF resource may be assumed.

[0174] Additionally, UE capabilities and / or upper layer configurations may be defined as follows: Whether FDM between MT Tx / Rx and DU Tx / Rx is supported ·Whether FDM is supported between MT Tx / Rx and DU Tx / Rx in the MT serving cell / DU cell

[0175] Also, the above may only apply if the corresponding UE capabilities are reported and / or configured by the corresponding higher layer signaling.

[0176] (4) Actions and Effects According to the above-described embodiment, the following advantageous effects can be obtained. Specifically, the radio communication node 100B (IAB node) can receive resource information indicating the type of DU resource (H / S / NA, IA / INA) allocated to the radio link set up via the function of the DU for the lower node (UE 200 or child node). Furthermore, the radio communication node 100B can set up the radio link (child link) based on the resource information. Furthermore, the resource information is resource information indicating the type of time resource in the time direction and the type of frequency resource in the frequency direction for at least some of the time resources, or resource information indicating the type of resource for each combination of a position in the time direction and a position in the frequency direction for at least some of the time resources.

[0177] Therefore, the IAB node can perform simultaneous transmission and reception using FDM for the MT and DU even when TDM and FDM are mixed. That is, the IAB node can determine whether DU resources, specifically frequency resources, are applicable to simultaneous transmission and reception with the MT using FDM, and thus the IAB node can perform appropriate simultaneous transmission and reception using FDM for the MT and DU even when TDM and FDM coexist.

[0178] In this embodiment, the wireless communication node 100B can receive resource information indicating the type of time resource in the time direction, resource information indicating the type of frequency resource in the frequency direction, or resource information indicating the type of resource for each combination of a position in the time direction and a position in the frequency direction.

[0179] Therefore, in this embodiment, the wireless communication node 100B receives new frequency direction resource type information separately in addition to the conventional resource type information for each DU symbol / slot, and thus the wireless communication node 100B can flexibly and reliably determine the type of time resource and the type of frequency resource.

[0180] In this embodiment, the wireless communication node 100B is configured with some time resources that indicate the type of frequency resource in the frequency direction, or is notified by the network.

[0181] Therefore, the radio communication node 100B can determine whether or not the type of frequency resource in the frequency direction is indicated for a part of the time, either implicitly or explicitly from other information or the like.

[0182] (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.

[0183] 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.

[0184] Furthermore, the wireless communication node may simply be called a communication device or a communication node, or may be read as a wireless base station.

[0185] In the above-described embodiment, 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, terms such as first link, second link, first direction, and second direction may simply be used.

[0186] Furthermore, the block diagrams (FIGS. 3 and 4) used in the description of the above-described embodiments show functional blocks. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method of 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 the single device or the multiple devices with software.

[0187] 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.

[0188] Furthermore, the above-described CU 50, the wireless communication nodes 100A to 100C, and the UE 200 (the devices) may function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 19 is a diagram showing an example of the hardware configuration of the devices. As shown in Fig. 19, 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.

[0189] 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.

[0190] Each functional block of the device (see FIGS. 3 and 4) is realized by any hardware element of the computer device or a combination of the hardware elements.

[0191] 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.

[0192] 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.

[0193] 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.

[0194] 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.

[0195] 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.

[0196] 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.

[0197] 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).

[0198] 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).

[0199] 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.

[0200] 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.

[0201] 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.

[0202] Each aspect / embodiment described in the present disclosure may be implemented in accordance with Long Term Evolution (LTE), LTE-Advanced (LTE-A), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5G, and other standards. th The present invention may be applied to at least one of a system using a next 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 enhanced based on these. Furthermore, the present invention may be applied to a combination of multiple systems (e.g., a combination of at least one of LTE and LTE-A with 5G).

[0203] 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.

[0204] 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, an MME or an S-GW, etc., but are not limited to these). 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.

[0205] 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.

[0206] The input and output information may be stored in a specific location (for example, memory) or may be managed using a management table. The input and output information may be overwritten, updated, or added to. The output information may be deleted. The input information may be sent to another device.

[0207] 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).

[0208] 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).

[0209] 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.

[0210] 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.

[0211] 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.

[0212] 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.

[0213] As used in this disclosure, the terms "system" and "network" are used interchangeably.

[0214] 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.

[0215] 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.

[0216] 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.

[0217] 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)).

[0218] 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.

[0219] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," etc. may be used interchangeably.

[0220] 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.

[0221] 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.

[0222] 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.

[0223] 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.

[0224] 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.

[0225] 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.

[0226] 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.

[0227] 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.

[0228] 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.

[0229] 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.

[0230] 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.

[0231] 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.

[0232] 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.

[0233] 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.

[0234] 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.

[0235] 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.

[0236] 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.

[0237] 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.

[0238] 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.

[0239] 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.

[0240] 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.

[0241] 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."

[0242] 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.

[0243] 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.

[0244] The reference signal may also be abbreviated as Reference Signal (RS), and may also be called a pilot depending on the applicable standard.

[0245] 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."

[0246] The "means" in the configuration of each of the above devices may be replaced with "part," "circuit," "device," etc.

[0247] 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.

[0248] 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.

[0249] 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.

[0250] 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.

[0251] 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."

[0252] 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]

[0253] 10. Wireless communication systems 50 CU 100A, 100B, 100C wireless communication nodes 110 Radio transmitter 120 Radio receiver 130 NW IF Department 140 IAB Node Connection 150 control section 161 Radio transmitter 162 Radio receiving unit 170 Upper node connection part 180 Lower Node Connection 190 Control Unit UE 200 1001 processor 1002 memory 1003 Storage 1004 Communication equipment 1005 Input Device 1006 Output Device 1007 Bus

Claims

1. a receiving unit that receives resource information indicating types of resources allocated to wireless links with lower nodes from a central device; a control unit that sets the wireless link based on the resource information, The wireless communication node, wherein the control unit applies a setting based on the resource information in the frequency domain indicating a resource type to each symbol of a slot.

2. The wireless communication node according to claim 1 , wherein the control unit applies the setting when the wireless communication node performs simultaneous transmission and reception in the slot.

3. The wireless communication node according to claim 1, wherein the resource information explicitly indicates whether the resource type is "Hard", which indicates that the corresponding time resource is a radio resource that is always available for use as a DU child link connected to a child node, "Soft", which indicates that the corresponding time resource is a radio resource whose availability for use as a DU child link is explicitly or implicitly controlled by a parent node, or "NA", which indicates that the corresponding time resource is an unavailable radio resource.

4. a receiving step of receiving, from the central device, resource information indicating the type of resource allocated to a wireless link with a lower node; a control step of setting up the wireless link based on the resource information; The control step applies a setting based on the resource information in the frequency domain indicating a resource type to each symbol of the slot.

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