WO2021152729A1

WO2021152729A1 - Wireless communication node

Info

Publication number: WO2021152729A1
Application number: PCT/JP2020/003198
Authority: WO
Inventors: 大輔栗田; 浩樹原田; ウェイチースン; ジンワン; ギョウリンコウ
Original assignee: 株式会社Ｎｔｔドコモ
Priority date: 2020-01-29
Filing date: 2020-01-29
Publication date: 2021-08-05
Also published as: JPWO2021152729A1

Abstract

A wireless communication node (100B) transmits, to a higher-order node or a network, resource information indicating whether a flexible resource directed towards a lower-order node is used in the uplink direction or the downlink direction.

Description

Wireless communication node

This disclosure relates to a wireless communication node that sets wireless access and a wireless backhaul.

The 3rd Generation Partnership Project (3GPP) has specified Long Term Evolution (LTE), and aims to further speed up LTE with LTE-Advanced (hereinafter referred to as LTE including LTE-Advanced), and 5G New Radio (NR). ) Or the successor system of LTE called Next Generation (NG) is specified.

For example, in an NR radio access network (RAN), Integrated Access and Backhaul integrate wireless access to terminals (User Equipment, UE) and wireless backhaul between wireless communication nodes such as wireless base stations (gNB). (IAB) is being studied (see Non-Patent Document 1).

In IAB, IAB nodes have MobileTermination (MT), which is a function for connecting to a parent node (may be called an IAB donor), and DistributedUnit (DU), which is a function for connecting to a child node or UE. ) And.

In 3GPP Release 16, wireless access and wireless backhaul are premised on half-duplex communication (Half-duplex) and time division multiplexing (TDM). Further, in Release 17, the application of frequency division multiplexing (FDM), spatial division multiplexing (SDM), and full-duplex communication (Non-Patent Document 2) is being studied. In other words, simultaneous operation of MT and DU is being considered.

The wireless resources available for wireless access and wireless backhaul include downlink (DL), uplink (UL) and Flexible time-resource (D / U / F) from a DU perspective. , Hard, soft or Not Available (H / S / NA).

Flexible time-resource (F) is a time resource that can be used for both DL and UL. In addition, "hard" is a wireless resource that is always available for DU child link in which the corresponding time resource is connected to the child node or UE, and "software" is for DU child link of the corresponding time resource. A radio resource (DU resource) whose availability is explicitly or implicitly controlled by the parent node.

Therefore, as the DU resource, either DL-H, DL-S, UL-H, UL-S, F-H, F-S or NA is set.

As mentioned above, 3GPP Release 16 assumes TDM and does not consider the simultaneous operation of MT and DU of the IAB node. In the future, in Release 17 and later, the application of spatial division multiplexing (SDM) and frequency division multiplexing (FDM) will be studied as described above.

When specifying Release 17 or later, it is necessary to consider the realization of simultaneous operation of MT and DU while following the IAB function of Release 16.

In particular, if the DU resource is Flexible, specifically FH or FS, the parent node may not always be able to correctly recognize whether the Flexible DU resource is used in the DL or UL of the IAB node. There is sex.

Therefore, the following disclosure was made in view of such a situation, and even when Flexible DU resources are used in Integrated Access and Backhaul (IAB), more reliable simultaneous operation of MT and DU is realized. The purpose is to provide a wireless communication node to obtain.

One aspect of the present disclosure includes an upper node connection unit (upper node connection unit 170) used for connection with an upper node, a lower node connection unit (lower node connection unit 180) used for connection with a lower node, and the above. A wireless communication node (wireless communication) including a transmission unit (radio transmission unit 161) that transmits resource information indicating whether the flexible resource for the lower node is used in the downlink or uplink direction to the upper node or the network. Node 100B).

One aspect of the present disclosure is a receiving unit (wireless receiving unit 120) that receives resource information indicating whether a flexible resource for a lower node is used in a downlink direction or an uplink direction from the lower node, and the resource. When the direction of the flexible resource indicated by the information is different from the set direction of the flexible resource, a wireless communication node (control unit 150) including a control unit (control unit 150) that gives priority to the set direction of the flexible resource (control unit 150). Wireless communication node 100A).

FIG. 1 is an overall schematic configuration diagram of the wireless communication system 10. FIG. 2 is a diagram showing a basic configuration example of the IAB. FIG. 3 is a functional block configuration diagram of the wireless communication node 100A. FIG. 4 is a functional block configuration diagram of the wireless communication node 100B. FIG. 5 is a diagram showing an outline of a communication sequence regarding reporting to the parent node in the direction (DL or UL) in which the Flexible DU resource of the IAB node is used. FIG. 6 is a diagram showing the relationship between the trigger of the report to the parent node in the transmission direction of the Flexible DU resource in the IAB node and the transmission timing of the report. FIG. 7 is a diagram showing an example of a transmission sequence of resource information using MAC-CE or higher layer signaling. FIG. 8 is a diagram showing a setting example of a target section for reporting the transmission direction of the Flexible DU resource of the IAB node. FIG. 9 is a diagram showing an example of setting and reporting the Flexible DU resource in the operation example 2-2-1. FIG. 10 is a diagram showing a flexible DU resource setting and reporting example (No. 1) in the operation example 2-2-2. FIG. 11 is a diagram showing a flexible DU resource setting and reporting example (No. 2) in the operation example 2-2-2. FIG. 12 is a diagram showing a flexible DU resource setting and reporting example (No. 1) in the operation example 2-2-3a. FIG. 13 is a diagram showing a flexible DU resource setting and reporting example (No. 2) in the operation example 2-2-3a. FIG. 14 is a diagram showing a flexible DU resource setting and reporting example (No. 1) in the operation example 2-2-3b. FIG. 15 is a diagram showing a flexible DU resource setting and reporting example (No. 2) in the operation example 2-2-3b. FIG. 16 is a diagram showing a configuration example of a slot format table and an example of D / U / F allocation for each symbol in the slot. FIG. 17 is a diagram showing an example (No. 1) in which the quasi-static setting contents of the DU resource in the operation example 3 and the contents of the resource information (report) are inconsistent. FIG. 18 is a diagram showing an example (No. 2) in which the quasi-static setting contents of the DU resource in the operation example 3 and the contents of the resource information (report) are inconsistent. FIG. 19 is a diagram showing an example of the hardware configuration of the CU 50, the wireless communication nodes 100A to 100C, and the UE 200.

Hereinafter, embodiments will be described based on the drawings. The same functions and configurations are designated by the same or similar reference numerals, and the description thereof will be omitted as appropriate.

(1) Overall Schematic Configuration of Wireless Communication System FIG. 1 is an overall schematic configuration diagram of the wireless communication system 10 according to the present embodiment. The wireless communication system 10 is a wireless communication system according to 5G New Radio (NR), and is composed of a plurality of wireless communication nodes and terminals.

Specifically, the wireless communication system 10 includes

wireless communication nodes

100A, 100B, 100C, and a user terminal 200 (hereinafter, UE200).

Wireless communication nodes

100A, 100B, 100C can set wireless access with UE200 and wireless backhaul (BH) between the wireless communication nodes. Specifically, a backhaul (transmission path) by a wireless link is set between the wireless communication node 100A and the wireless communication node 100B, and between the wireless communication node 100A and the wireless communication node 100C.

In this way, the configuration in which the wireless access with the UE 200 and the wireless backhaul between the wireless communication nodes are integrated is called Integrated Access and Backhaul (IAB).

IAB reuses existing features and interfaces defined for wireless 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), and support Interfaces such as NR Uu (between MT and gNB / DU), F1, NG, X2 and N4 are used as baselines.

The wireless communication node 100A is connected to the NR radio access network (NG-RAN) and core network (Next Generation Core (NGC) or 5GC) via a wired transmission line such as a fiber transport. NG-RAN / NGC includes CentralUnit 50 (hereinafter referred to as CU50), which is a communication node. In addition, NG-RAN and NGC may be included and simply expressed as "network".

The CU50 may be configured by any or a combination of the above-mentioned UPF, AMF, and SMF. Alternatively, the CU 50 may be a gNB-CU as described above.

FIG. 2 is a diagram showing a basic configuration example of IAB. As shown in FIG. 2, in the present embodiment, the wireless communication node 100A constitutes a parent node (Parent node) in the IAB, and the wireless communication node 100B (and the wireless communication node 100C) constitutes an IAB node in the IAB. ..

The parent node may be called a higher-level node in relation to the IAB node. In addition, the parent node may be referred to as the IAB donor. In addition, the IAB node may be called a subordinate node in relation to the parent node.

The child node in the IAB is composed of other wireless communication nodes (not shown in FIG. 1). Alternatively, the UE 200 may configure a child node. The IAB node may be referred to as the superior node in relation to the child node, and the child node may be referred to as the inferior node in relation to the IAB node.

A wireless link is set between the parent node and the IAB node. Specifically, a wireless link called Link_parent is set.

A wireless link is set between the IAB node and the child node. Specifically, a wireless link called Link_child is set.

The wireless link set between such wireless communication nodes is called a wireless backhaul link. Link_parent is composed of DL Parent BH in the downward direction and UL Parent BH in the upward direction. Link_child is composed of DL Child BH in the downward direction and UL Child BH in the upward direction.

The wireless link set between the UE200 and the IAB node or parent node is called a wireless access link. Specifically, the wireless link is composed of DL Access in the downlink direction and UL Access in the uplink direction.

The IAB node has a MobileTermination (MT), which is a function for connecting to a parent node, and a DistributedUnit (DU), which is a function for connecting to a child node (or UE200). Although omitted in FIG. 2, the parent node and the child node also have MT and DU.

From the viewpoint of DU, the wireless resources used by DU include downlink (DL), uplink (UL) and Flexible time-resource (D / U / F), which are hard, soft or Not Available (H / S /). It is classified into any type of NA). Also, in the software (S), availability or not available is specified.

The IAB configuration example shown in FIG. 2 uses CU / DU division, but the IAB configuration is not necessarily limited to such a configuration. For example, in the wireless backhaul, IAB may be configured by tunneling using GPRS Tunneling Protocol (GTP) -U / User Datagram Protocol (UDP) / Internet Protocol (IP).

The main advantage of such IAB is that NR cells can be arranged flexibly and at high density without increasing the density of the transport network. The IAB can be applied in a variety of scenarios, such as outdoor small cell placement, indoors, and even support for mobile relays (eg, in buses and trains).

The IAB may also support NR-only stand-alone (SA) deployments or non-standalone (NSA) deployments including other RATs (LTE, etc.), as shown in FIGS. 1 and 2.

In this embodiment, the wireless access and the wireless backhaul operate on the premise of half-duplex communication. However, it is not necessarily limited to half-duplex communication, and full-duplex communication may be used as long as the requirements are satisfied.

In addition, time division multiplexing (TDM), spatial division multiplexing (SDM), and frequency division multiplexing (FDM) can be used as the multiplexing method.

When the IAB node operates in half-duplex communication, DLParentBH is the receiving (RX) side, ULParentBH is the transmitting (TX) side, DLChildBH is the transmitting (TX) side, and UL. Child BH is the receiving (RX) side. In the case of Time Division Duplex (TDD), the DL / UL setting pattern on the IAB node is not limited to DL-F-UL, but only the wireless backhaul (BH), UL-F-DL, and other setting patterns. May be applied.

Further, in this embodiment, SDM / FDM is used to realize simultaneous operation of DU and MT of the IAB node.

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

(2.1) Wireless communication node 100A
FIG. 3 is a functional block configuration diagram of the wireless communication node 100A constituting the parent node. As shown in FIG. 3, the wireless communication node 100A includes a wireless transmission unit 110, a wireless reception unit 120, an NW IF unit 130, an IAB node connection unit 140, and a control unit 150.

The wireless transmitter 110 transmits a wireless signal according to the 5G specifications. In addition, the wireless receiver 120 transmits a wireless signal according to the 5G specifications. In the present embodiment, the wireless transmission unit 110 and the wireless reception unit 120 execute wireless communication with the wireless communication node 100B constituting the IAB node.

In the present 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 corresponding to MT / DU.

The wireless receiver 120 can receive resource information indicating the usage status of the flexible resource (F) for DU of the IAB node from the lower node (IAB node). In the present embodiment, the wireless receiving unit 120 constitutes a receiving unit.

Specifically, the wireless receiver 120 can receive resource information indicating in which direction the flexible resource for the lower node (IAB node) is used, DL or UL. The resource information may be any information that can recognize the direction in which the Flexible DU resource used in the DU of the IAB node is used (may be called the transmission direction, communication direction, etc.). The details of the resource information will be described later.

Resource information can be included in uplink control information, specifically Uplink Control Information (UCI). Alternatively, the resource information is transmitted from the IAB node by signaling from the MAC-CE (Medium Access Control-Control Element) or the upper layer (radio resource control layer (RRC), etc.), and the parent node (upper node) is the resource. Information may be received.

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

The IAB node connection unit 140 provides an interface or the like that realizes a connection with an IAB node (or a child node including a UE). Specifically, the IAB node connection unit 140 provides the distributed unit (DU) function. That is, the IAB node connection unit 140 is used for connection with the IAB node (or child node).

The IAB node may be expressed as a RAN node that supports wireless access to the UE200 and backhauls access traffic wirelessly. The parent node, or IAB donor, may also be described as a RAN node that provides the UE interface to the core network and wireless backhaul functionality to the IAB node.

The control unit 150 controls each functional block constituting the wireless communication node 100A. In particular, in the present embodiment, the control unit 150 executes control regarding the flexible resource for the IAB node, specifically, the Flexible DU resource of the IAB node.

The control unit 150 may have a quasi-static setting indicating in which direction the Flexible DU resource of the IAB node is used, DL or UL. A semi-static setting may mean that the setting is not dynamically changed, but may be updated or changed based on instructions from the network.

If the direction of the flexible resource indicated by the received resource information or the direction of the DU resource including the flexible resource is different from the direction of the set DU resource, that is, the quasi-static setting, the control unit 150 sets the DU. The direction of the resource may be prioritized. That is, the control unit 150 does not have to follow the direction (DL or UL) of the DU resource indicated by the received resource information. Note that the direction of the DU resource (including the Flexible DU resource) indicated by the resource information is different from the direction of the set DU resource when a part of the DU resource (for example, symbol level) is different. It may be, or it may be the case that all the DU resources concerned are different.

Further, the control unit 150 does not have to expect the resource information to be transmitted (reported) from the IAB node for the DU resource indicated by the quasi-static setting.

(2.2) Wireless communication node 100B
FIG. 4 is a functional block configuration diagram of the wireless communication node 100B constituting the IAB node. As shown in FIG. 4, the wireless communication node 100B includes a wireless transmission unit 161, a wireless reception unit 162, an upper node connection unit 170, a lower node connection unit 180, and a control unit 190.

As described above, the wireless communication node 100B has a functional block similar to the wireless communication node 100A (parent node) described above, but includes a higher node connection unit 170 and a lower node connection unit 180, and a function of the control unit 190. Is different.

The wireless transmitter 161 transmits a wireless signal according to the 5G specifications. In addition, the radio receiver 162 transmits a radio signal according to the 5G specifications. In the present embodiment, the wireless transmission unit 161 and the wireless reception unit 162 execute wireless communication with the wireless communication node 100A constituting the parent node and wireless communication with the child node (including the case of UE200).

The wireless transmission unit 161 can transmit resource information indicating the usage status of the flexible resource (F) for DU of the IAB node to the upper node (parent node). In the present embodiment, the wireless transmission unit 161 constitutes a transmission unit. The wireless transmission unit 161 may transmit the resource information to the network (for example, CU50).

Specifically, the wireless transmission unit 161 transmits resource information indicating in which direction the flexible resource (Flexible DU resource) for the lower node (IAB node) is used, DL or UL. As mentioned above, resource information can be transmitted via UCI, MAC-CE or higher layer signaling.

The wireless transmission unit 161 can transmit resource information indicating in which direction the Flexible DU resource is used, DL or UL, for each slot or symbol.

A slot is a data scheduling unit, and may be composed of a plurality of symbols, specifically, Orthogonal Frequency Division Multiplexing (OFDM) symbols. In addition, the slot may be composed of 14 symbols, or may be composed of a number of symbols more than 14 symbols (for example, 28, 56, etc.).

For resource information, 1 bit may be assigned to each Flexible DU resource, or 2 bits (or 3 bits or more) may be assigned. Further, the size of the resource information may be fixed or may change according to the number of Flexible DU resources. The resource information may be referred to as a report of a flexible resource (Flexible DU resource) for a lower node (IAB node).

Further, the wireless transmission unit 161 may transmit resource information indicating the number of flexible resources (Flexible DU resources) used in the DL or UL direction. The number of Flexible DU resources may be indicated directly or indirectly (or implicitly).

When indirectly indicating the number of Flexible DU resources used in the DL or UL direction, for example, by indicating the number of DU resources other than the Flexible DU resources used in the DL and UL directions, the number of the Flexible DU resources. May be shown indirectly (implicitly).

In addition, the IAB node (wireless communication node 100B) may arbitrarily set the target section of the resource information transmitted to the upper node (parent node). Alternatively, the target section of the resource information may be specified by the network.

For example, the target section of the resource information may be specified by a slot. Specifically, it may be a slot (n + k1) to a slot (n + k2). In this way, the time range in which the resource information is targeted is variable. Also, the slot (n + k2) may be shown directly or as an offset from the slot (n + k1).

The start position and end position of the section targeted by the resource information may be notified from the network to the IAB node by signaling such as the RRC layer. Alternatively, the IAB node may determine the start and end positions and notify the parent node or network.

The upper node connection unit 170 provides an interface that realizes a connection with a node higher than the IAB node. The upper node means a wireless communication node located on the network, specifically, the core network side (may be called the upstream side or the upstream side) rather than the IAB node.

Specifically, the upper node connection unit 170 provides the MobileTermination (MT) function. That is, in the present embodiment, the upper node connection unit 170 is used for connection with the parent node constituting the upper node.

The lower node connection unit 180 provides an interface that realizes a connection with a node lower than the IAB node. The lower node means a wireless communication node located on the end user side (which may be called the downstream side or the downlink side) of the IAB node.

Specifically, the lower node connection unit 180 provides the distributed unit (DU) function. That is, in the present embodiment, the lower node connection unit 180 is used for connection with a child node (which may be UE200) constituting the lower node.

The control unit 190 controls each functional block constituting the wireless communication node 100B. In particular, in the present embodiment, the control unit 190 executes control regarding flexible resources, specifically, Flexible DU resources.

As mentioned above, the DU resource can be defined as Flexible (F) that can be used for both DL and UL.

In this way, the control unit 190 can determine in which direction the radio resource is used for the lower node, that is, the radio resource (Flexible) used by either DL or UL in the child node. The wireless resources (DU resources) include Flexible hardware (hereinafter, appropriately referred to as F-H) and Flexible software (appropriately referred to as F-S) resources.

The control unit 190 can use the Uplink Control Information (UCI) to transmit resource information indicating in which direction the radio resource is used from the radio transmission unit 161. UCI is transmitted over a predetermined channel.

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

The data channels include PDSCH (Physical Downlink Shared Channel) and PUSCH (Physical Uplink Shared Channel).

The reference signal includes Demodulation reference signal (DMRS), Sounding Reference Signal (SRS), Phase Tracking Reference Signal (PTRS), and Channel State Information-Reference Signal (CSI-RS), and the signal includes a channel. And reference signals are included. Further, the data may mean data transmitted via a data channel.

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

As described above, the control unit 190 may transmit the resource information from the radio transmission unit 161 by signaling of the MAC-CE or an upper layer (radio resource control layer (RRC) or the like).

The control unit 190 may determine the radio resource to be the target of the resource information based on the availability of the radio resource. Specifically, when the radio resource is software (S), the control unit 190 can determine the radio resource to be notified based on IA or INA.

"IA" means that the DU resource is explicitly or implicitly indicated as available. Also, "INA" means that the DU resource is explicitly or implicitly indicated as unavailable.

(3) Operation of Wireless Communication System Next, the operation of the wireless communication system 10 will be described. Specifically, when the simultaneous operation of DU and MT of the IAB node (simultaneous Tx / Rx) is realized by using SDM or FDM, the direction in which the flexible resource (Flexible DU resource) for the IAB node is used (DL or The operation of recognizing UL) by the parent node (upper node) will be described.

(3.1) Outline operation The direction (DL or UL) in which the flexible resource (Flexible DU resource) is used between the IAB node and the child node can be determined by the IAB node. In 3GPP Release-16, the IAB node can dynamically indicate the slot format to the child node (MT) using format 2_0 of Downlink Control Information (DCI).

In 3GPP Release-17, since the IAB node supports SDM / FDM, it is necessary to report the direction (DL or UL) in which the Flexible DU resource of the IAB node is used to the parent node. The report, i.e. the transmission of resource information described above, may be triggered by the IAB node based on the determination of the direction in which the flexible resource will be used between the DU of the IAB node and the child node or UE.

The report (resource information) can be transmitted by UCI, MAC-CE or higher layer signaling as described above.

FIG. 5 shows an outline of the communication sequence regarding reporting to the parent node in the direction (DL or UL) in which the Flexible DU resource of the IAB node is used.

As shown in FIG. 5, the wireless communication node 100B (IAB node) determines the direction (DL or UL) in which the Flexible DU resource of the IAB node is used (S10). The wireless communication node 100B may independently determine the direction in which the Flexible DU resource is used, or may determine the direction based on an instruction from the network.

The wireless communication node 100B has a child format (indicating either DL or UL) of the slot applied between the IAB node and the child node according to DCI format 2_0 based on the determination of the direction in which the Flexible DU resource is used. Notify the node (eg UE200) (S20).

Further, the wireless communication node 100B reports the direction in which the Flexible DU resource is used to the wireless communication node 100A (parent node) based on the content of determining the direction in which the Flexible DU resource is used (S30). Specifically, the wireless communication node 100B transmits resource information indicating the usage status of the Flexible DU resource of the IAB node to the wireless communication node 100A.

(3.2) Operation example Next, an operation example related to reporting Flexible DU resources (transmission of resource information) of the IAB node will be described.

Specifically, the following operation example will be described.

(Operation example 1) The IAB node triggers a report (may be called a notification) to the parent node in the direction in which the Flexible DU resource of the IAB node is used (hereinafter, appropriately abbreviated as the transmission direction) (Operation example 2) Parent Report target section and report content for node (Operation example 2-1) Set the report target section to arbitrary (slots n + k1 to n + k2) (Operation example 2-2) Transmission of Flexible DU resource of IAB node Details of report contents to the parent node of the direction (Operation example 2-2-1) Slot level report (The transmission direction of all Flexible DU resources in the slot must be the same)
(Operation example 2-2-2) Symbol level report (Operation example 2-2-3) Report the total number of Flexible DU resources used as DL and Flexible DU resources used as UL (UL of Flexible DU resource) / DL must be in the form DL- (F) -UL or UL- (F) -DL)
(Operation example 2-2-3a) In addition to the total number of DL and UL, report whether the Flexible DU resource is used in the form of DL-F-UL or UL-F-DL (Operation example 2-). 2-3b) Report only the total number of DL and UL (determine whether the Flexible DU resource is DL-F-UL or UL-F-DL is the same as the slot)
(Operation example 2-2-4) Report using a slot format table (Operation example 3) The transmission direction of the Flexible DU resource reported from the IAB node is quasi-static held by the parent node. If there is a conflict with the settings, the parent node gives priority to (assumes) the quasi-static settings.

(3.2.1) Operation example 1
A report to the parent node in the direction of transmission of the Flexible DU resource of the IAB node, that is, the transmission of resource information, can be triggered by the IAB node. The transmission of resource information may be executed by any of the following.

-Transmission of resource information using UCI: The IAB node transmits resource information using periodic PUCCH resources. Figure 6 shows the trigger of the report to the parent node in the transmission direction of the Flexible DU resource in the IAB node. The relationship with the report transmission timing is shown. As shown in FIG. 6, the resource information can be transmitted at the periodic PUCCH timing immediately after the transmission of the resource information is triggered.

-Transmission of resource information using MAC-CE or higher layer signaling: The IAB node transmits resource information using PUSCH resources. Figure 7 shows transmission of resource information using MAC-CE or higher layer signaling. An example sequence is shown.

As shown in FIG. 7, the wireless communication node 100B (IAB node) detects a report to the parent node in the transmission direction of the Flexible DU resource of the IAB node, that is, the occurrence of a trigger for resource information transmission (S110). The trigger may occur at the timing when the transmission direction of the Flexible DU resource is newly determined, or at the timing when the transmission direction is changed.

Since the wireless communication node 100B transmits resource information via UL, it requests UL transmission permission (UL grant) from the parent node (S120). The UL grant request is sent when the available PUSCH resource is not set. In this way, the wireless communication node 100B transmits resource information via PUSCH.

The wireless communication node 100A (parent node) returns the UL grant to the wireless communication node 100B at the request of the UL grant (S130).

The wireless communication node 100B reports the direction in which the Flexible DU resource is used via PUSCH, that is, transmits the resource information to the wireless communication node 100A (S140).

In the case of sending resource information using UCI, it is necessary to reserve PUCCH resources for the report, so the usage rate of PUCCH resources may decrease.

(3.2.2) Operation example 2
Next, an operation example relating to the target section of the report to the parent node and the report content will be described. Specifically, the following operation example will be described.

(Operation example 2-1) When resource information (report) is transmitted in slot n, the resource information is composed of information indicating the transmission direction of flexible resources in slots n + k1 to n + k2. (Operation example 2-2) Regarding the resource information (report) of each slot, the granularity of the information (report) may be different as follows in consideration of the overhead.

(Operation example 2-2-1) Send a slot level report. One or two bits may be used to indicate the type of D / U or D / U / F for each slot.

(Operation example 2-2-2) Send a symbol level report. One or two bits may be used to indicate the D / U or D / U / F type of each symbol in the slot.

(Operation example 2-2-3) Send a symbol group level report. The report starts with consecutive DL / UL symbols and ends with consecutive UL / DL symbols. The number of consecutive DL and / or UL symbols may be indicated per slot.

(Operation example 2-2-4) To indicate the slot format of each slot, the entry index indicated by the slot format table of 3GPP TS38.213 is used.

Note that the above-mentioned operation example 2-2 is applied to both a set periodic, semi-persistent or aperiodic report and a report triggered by UE200. May be done.

Further, the operation example may be applied to F-H only or both F-H and F-S DU resources. In this case, the Flexible resources (F-H, F-S) of DU may be subject to the following conditions in consideration of SDM / FDM support.

(Condition 1): In the case of SDM / FDM, simultaneous transmission / reception of DU and MT in the case of F-H (hereinafter, simultaneous Tx / Rx) is executed according to the direction of DU.

・ In F-H, MT can execute Tx only when DU is Tx and the parent node DU knows in advance that DU is Tx. MT can only execute Rx if the DU is Rx and the parent node DU knows in advance that the DU is Rx.

・ In F-S, simultaneous Tx / Rx cannot be executed or can be executed according to the direction of MT.

(Condition 2): In the case of SDM / FDM, simultaneous Tx / Rx is supported by following the direction of DU in both F-S and F-H shown as IA resources.

・ In F-S and F-H shown as IA resources, MT can execute Tx only when DU is Tx and the parent node DU knows in advance that DU is Tx. MT can only execute Rx if the DU is Rx and the parent node DU knows in advance that the DU is Rx.

That is, condition 1 is when the DU resource is F-H, and condition 2 is F-H or F-S (when available).

Also, in the case of F-S, the DU resource indicated as "INA" is excluded, but it may be applied to all DU resources indicated as "IA". In the following explanation, the DU resource shown as "IA" is targeted.

(3.2.2.1) Operation example 2-1
In this operation example, the IAB node (or network) can determine the target section for reporting the transmission direction of the Flexible DU resource of the IAB node.

FIG. 8 shows an example of setting the target section for reporting the transmission direction of the Flexible DU resource of the IAB node. As shown in FIG. 8, when the resource information (report) is transmitted in slot n, the resource information is composed of information indicating the transmission direction of the flexible resource in the slots from slot n + k1 to slot n + k2. You can. Note that k1 and k2 may be arbitrary values (however, k1 <k2).

K1 and k2 may be predetermined and notified from the network to the parent node and the IAB node by signaling of the RRC layer.

Alternatively, k1 and k2 may be determined by the IAB node together with the transmission direction of the Flexible DU resource and reported to the parent node (which may include the network).

Further, k1 may be indicated by an offset (number of slots) from the report transmission opportunity (report occurrence), and k2 may be indicated by an offset from the report transmission opportunity or an offset from k1.

(3.2.2.2) Operation example 2-2
In this operation example, the IAB node transmits multiple types of resource information (reports) with different particle sizes of information (reports).

(3.2.2.2.) Operation example 2-2-1
The IAB node sends slot-level reports. FIG. 9 shows an example of setting and reporting the Flexible DU resource in the operation example 2-2-1.

As shown in FIG. 9, 1 bit is used to indicate whether the Flexible DU resource is used for DL or UL (in FIG. 9, "0" indicates DL and "1" indicates UL). The 1-bit display may be applied to all Flexible symbols (F symbols) in the slot. The upper part of FIG. 9 shows the configuration of the slot including the F symbol (6 symbols in the center), and the lower part of FIG. 9 shows the configuration of the slot after it is decided that the F symbol is used as DL or UL. (Same below).

Further, for each slot, 1 bit may be used to indicate the type (D / U / F) of the DU resource, and a total of 2 bits may be used. Again, the additional 1-bit display may apply to all F symbols in the slot.

(3.2.2.2) Operation example 2-2-2
The IAB node sends a symbol-level report for each strike. FIG. 10 shows an example of setting and reporting the Flexible DU resource (No. 1) in the operation example 2-2-2.

As shown in FIG. 10, for each symbol in the slot, 1 bit is used to indicate whether the Flexible DU resource is used for DL or UL (in FIG. 10, “0” is DL and “1” is Indicates UL). In the example shown in FIG. 10, only the F symbol is targeted, and the 6 F symbols and the corresponding 6 bits are used.

The size of the resource information (report) is variable and may change depending on the number of F symbols. Since the parent node can recognize the type (D / U / F) of the DU resource by the quasi-static setting, the size of the resource information can be determined.

FIG. 11 shows an example of setting and reporting the Flexible DU resource (No. 2) in the operation example 2-2-2. As shown in FIG. 11, for each symbol in the slot, one bit is used to indicate whether the Flexible DU resource is used for DL or UL. This point is the same as the example shown in FIG.

On the other hand, in the example shown in FIG. 11, not only the F symbol but all the symbols (14 symbols) in the slot are targeted, and the 14 bits corresponding to each symbol in the slot are used.

Further, as in the operation example 2-2-1, 1 bit may be used for each slot to indicate the type (D / U / F) of the DU resource, and a total of 2 bits may be used. Again, the additional 1-bit display may apply to only the F symbol in the slot (6 bits) or to all symbols in the slot (14 bits).

(3.2.2.2.3) Operation example 2-2-3
The IAB node sends a symbol group level report. Specifically, the IAB node sends resource information (report) to the parent node so that the parent node can determine the total number of Flexible DU resources used as DL and Flexible DU resources used as UL.

(3.2.2.2.3a) Operation example 2-2-3a
The IAB node reports the total number of DLs and ULs, as well as whether Flexible DU resources are used in the form DL-F-UL or UL-F-DL.

Note that DL-F-UL means that the slot starts with the DL symbol and ends with the UL symbol, and UL-F-DL means that the slot starts with the UL symbol and ends with the DL symbol. You can do it.

FIG. 12 shows an example of setting and reporting the Flexible DU resource (No. 1) in the operation example 2-2-3a. In this operation example, the resource information indicates the total number of F symbols used as DL symbols and the total number of F symbols used as UL symbols. In FIG. 12, the F symbol that is not used in either DL or UL is shown as F as it is.

As shown in FIG. 12, the number of DL symbols and UL symbols among the F symbols is shown for each slot.

Also, considering that the slot format is DL-F-UL (denoted as DFU in the figure) or UL-F-DL (denoted as UFD in the figure), the following options are applied. good.

(Option 1) 1 bit is used to indicate whether the slot format is DL-F-UL or UL-F-DL (Option 2) There is no explicit indication by resource information. In this case, the parent node can recognize whether it is DL-F-UL or UL-F-DL by the quasi-static setting.

FIG. 13 shows an example of setting and reporting the Flexible DU resource (No. 2) in the operation example 2-2-3a. In this operation example, the resource information indicates the total number of DL symbols and the total number of UL symbols among all the symbols in the slot including the F symbol. In FIG. 13, the F symbol that is not used in either DL or UL is shown as F as it is.

Further, also in this operation example, as shown in FIG. 13, the above-mentioned option 1 or option 2 may be applied.

(3.2.2.22.3b) Operation example 2-2-3b
The IAB node reports the transmission direction of the Flexible DU resource at the symbol group level for each slot.

FIG. 14 shows an example of setting and reporting the Flexible DU resource (No. 1) in the operation example 2-2-3b. In this operation example, the resource information indicates the total number of symbols used as DL symbols (or UL symbols) in the slot, and the remaining symbols are determined to be UL symbols (or DL symbols).

As shown in FIG. 14, the number of DL symbols (2 symbols) among the F symbols is shown for each slot. Of the F symbols, the remaining symbols (4 symbols) may be determined to be used as UL. In this operation example as well, as shown in FIG. 14, the above-mentioned option 1 or option 2 may be applied.

FIG. 15 shows an example of setting and reporting the Flexible DU resource (No. 2) in the operation example 2-2-3b. In this operation example, the resource information indicates the total number of DL symbols (or UL symbols) among all the symbols in the slot including the F symbol, and the remaining symbols are determined to be UL symbols (or DL symbols). .. In this operation example as well, as shown in FIG. 15, the above-mentioned option 1 or option 2 may be applied.

(3.2.2.2.4) Operation example 2-2-4
For each slot, the IAB node reports the transmission direction of the F symbol to the parent node using the entry index of the slot format table as specified in 3GPP TS38.213 Section 11.1.1.

FIG. 16 shows a configuration example of a slot format table and an example of D / U / F allocation for each symbol in the slot.

As shown in FIG. 16, in the slot format table, in Format 6 (called index 6), the first 10 symbols out of the 14 symbols in the slot are used as DL symbols, and the remaining 4 symbols are F symbols. It has been shown to be used as.

Note that 8-bit information may be used in order to correspond to the number of Format (index) (256) included in the table.

In the example shown in FIG. 16, index 6 is selected. The IAB node only needs to report the numerical value (6) of the index to the parent node.

(3.2.3) Operation example 3
This operation example is related to the parent node. Specifically, if the transmission direction of the DU resource reported by the IAB node conflicts with the quasi-static settings held by the parent node, the parent node sets the quasi-static settings. Give priority (assume).

FIG. 17 shows an example (No. 1) in which the quasi-static setting contents of the DU resource in the operation example 3 and the contents of the resource information (report) are inconsistent.

As shown in FIG. 17, when the parent node receives the resource information (report), it determines whether or not the content of the resource information and the quasi-static setting content of the DU resource match. ..

The parent node does not expect the quasi-statically configured DL symbol to be reported by the IAB node as a UL or F symbol, and the quasi-statically configured UL symbol is reported as a DL or F symbol. You don't have to expect that.

In this case, as shown in FIG. 17, when at least a part (the last 4 symbols) of the quasi-statically set contents of the DU resource and the contents of the resource information do not match and are inconsistent, the resource information The content may be treated as an error.

FIG. 18 shows an example (No. 2) in which the quasi-static setting contents of the DU resource in the operation example 3 and the contents of the resource information (report) are inconsistent.

As shown in FIG. 18, when the transmission direction of the DU resource reported from the IAB node conflicts with the semi-static setting contents held by the parent node, the parent node is a flexible resource, specifically. , It is determined that the 6 F symbols are used as DL symbols according to the contents of the resource information, but the last 4 contradictory symbols may be used as UL symbols without reflecting the contents of the resource information. ..

That is, the parent node does not have to change the direction in which the symbols are used for DL symbols and UL symbols other than the F symbol.

(4) Action / Effect According to the above-described embodiment, the following action / effect can be obtained. Specifically, the IAB node (wireless communication node 100B) according to the present embodiment provides resource information indicating in which direction the flexible resource for the lower node (child node) is used, DL or UL, as the upper node. Can be sent to (parent node) or network.

Therefore, even if the DU resource is Flexible, specifically F-H or F-S, the parent node can correctly recognize whether the DU resource of the Flexible is used in DL or UL of the IAB node. As a result, even when Flexible DU resources are used in Integrated Access and Backhaul (IAB), more reliable simultaneous operation of MT and DU can be realized.

In the present embodiment, the IAB node can transmit resource information indicating in which direction the flexible resource is used, DL or UL, for each slot or symbol.

Also, the IAB node can send resource information indicating the number of flexible resources used in the DL or UL direction.

Therefore, resource information can be transmitted more efficiently according to the setting status of flexible resources. As a result, more efficient use of wireless resources can be realized.

In this embodiment, the time range in which the resource information is targeted is variable. Therefore, the size of the resource information can be flexibly set according to the type of the channel (PUCCH or PUSCH) used for transmitting the resource information. As a result, more efficient use of wireless resources can be realized.

In the present embodiment, when the direction of the flexible resource indicated by the resource information is different from the direction of the flexible resource set in the parent node, the parent node (wireless communication node 100A) is set in the direction of the flexible resource. May be prioritized.

Therefore, even if the transmission direction of the DU resource reported by the IAB node conflicts with the quasi-static setting contents held by the parent node, the operation according to the quasi-static setting content is performed. Can continue.

(5) Other Embodiments Although the embodiments have been described above, it is obvious to those skilled in the art that various modifications and improvements are possible without being limited to the description of the embodiments.

For example, in the above-described embodiment, the names of the parent node, the IAB node, and the child node have been used, but wireless communication in which wireless backhaul between wireless communication nodes such as gNB and wireless access with the terminal are integrated. The names may be different as long as the node configuration is adopted. For example, it may be simply called a first node, a second node, or the like, or it may be called an upper node, a lower node, a relay node, an intermediate node, or the like.

Further, the wireless communication node may be simply referred to as a communication device or a communication node, or may be read as a wireless base station.

In the above-described embodiment, the terms downlink (DL) and uplink (UL) were used, but they may be referred to by other terms. For example, it may be replaced with or associated with terms such as forward ring, reverse link, access link, and backhaul. Alternatively, terms such as first link, second link, first direction, and second direction may be used.

Further, the block configuration diagrams (FIGS. 3 and 4) used in the description of the above-described embodiment show the blocks of the functional units. These functional blocks (components) are realized by any combination of at least one of hardware and software. Further, the method of realizing each functional block is not particularly limited. That is, each functional block may be realized using one physically or logically coupled device, or two or more physically or logically separated devices can be directly or indirectly (eg, for example). , Wired, wireless, etc.) and may be realized using these plurality of devices. The functional block may be realized by combining the software with the one device or the plurality of devices.

Functions include judgment, decision, judgment, calculation, calculation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, solution, selection, selection, establishment, comparison, assumption, expectation, and assumption. Broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc., but limited to these I can't. For example, a functional block (constituent unit) that makes transmission function is called a transmitting unit (transmitting unit) or a transmitter (transmitter). As described above, the method of realizing each of them is not particularly limited.

Further, the above-mentioned CU50, wireless communication nodes 100A to 100C, and UE200 (the device) may function as a computer that processes the wireless communication method of the present disclosure. FIG. 19 is a diagram showing an example of the hardware configuration of the device. As shown in FIG. 19, the device may be configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like.

In the following explanation, the word "device" can be read as a circuit, device, unit, etc. The hardware configuration of the device may be configured to include one or more of each of the devices shown in the figure, or may be configured not to include some of the devices.

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.

Further, for each function in the device, by loading predetermined software (program) on the hardware such as the processor 1001 and the memory 1002, the processor 1001 performs the calculation, controls the communication by the communication device 1004, and the memory. It is realized by controlling at least one of reading and writing of data in 1002 and storage 1003.

Processor 1001 operates, for example, an operating system to control the entire computer. The processor 1001 may be composed of a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, a register, and the like.

Further, the processor 1001 reads a program (program code), a software module, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and executes various processes according to these. As the program, a program that causes a computer to execute at least a part of the operations described in the above-described embodiment is used. Further, 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. Processor 1001 may be implemented by one or more chips. The program may be transmitted from the network via a telecommunication line.

The memory 1002 is a computer-readable recording medium, and is composed of at least one such as ReadOnlyMemory (ROM), ErasableProgrammableROM (EPROM), Electrically ErasableProgrammableROM (EEPROM), and RandomAccessMemory (RAM). May be done. The memory 1002 may be called a register, a cache, a main memory (main storage device), or the like. The memory 1002 can store a program (program code), a software module, or the like that can execute the method according to the embodiment of the present disclosure.

The storage 1003 is a computer-readable recording medium, for example, an optical disk such as a Compact Disc ROM (CD-ROM), a hard disk drive, a flexible disk, an optical magnetic disk (for example, a compact disk, a digital versatile disk, or a Blu-ray). It may consist of at least one (registered trademark) disk), smart card, flash memory (eg, card, stick, key drive), floppy (registered trademark) disk, magnetic strip, and the like. Storage 1003 may be referred to as auxiliary storage. The recording medium described above may be, for example, a database, server or other suitable medium containing at least one of memory 1002 and storage 1003.

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 referred to as, for example, a network device, a network controller, a network card, a communication module, or the like.

The communication device 1004 includes, for example, a high frequency switch, a duplexer, a filter, a frequency synthesizer, etc. in order to realize at least one of frequency division duplex (FDD) and time division duplex (TDD). It may be composed of.

The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that accepts 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 have an integrated configuration (for example, a touch panel).

In addition, each device such as the processor 1001 and the memory 1002 is connected by the bus 1007 for communicating information. Bus 1007 may be configured using a single bus or may be configured using different buses for each device.

Further, the device includes hardware such as a microprocessor, a digital signal processor (Digital Signal Processor: DSP), an Application Specific Integrated Circuit (ASIC), a Programmable Logic Device (PLD), and a Field Programmable Gate Array (FPGA). The hardware may implement some or all of each functional block. For example, processor 1001 may be implemented using at least one of these hardware.

Further, the notification of information is not limited to the mode / embodiment described in the present disclosure, and may be performed by using another method. For example, information notification includes physical layer signaling (eg, Downlink Control Information (DCI), Uplink Control Information (UCI), higher layer signaling (eg, RRC signaling, Medium Access Control (MAC) signaling, broadcast information (Master Information Block)). (MIB), System Information Block (SIB)), other signals or a combination thereof. RRC signaling may also be referred to as an RRC message, for example, RRC Connection Setup. ) Message, RRC Connection Reconfiguration message, etc. may be used.

Each aspect / embodiment described in this disclosure, Long Term Evolution (LTE), LTE-Advanced (LTE-A), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5 th 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®), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth®, and other systems that utilize suitable systems and at least next-generation systems extended based on them. It may be applied to one. In addition, a plurality of systems may be applied in combination (for example, a combination of at least one of LTE and LTE-A and 5G).

The order of the processing procedures, sequences, flowcharts, etc. of each aspect / embodiment described in the present disclosure may be changed as long as there is no contradiction. For example, the methods described in the present disclosure present elements of various steps using exemplary order, and are not limited to the particular order presented.

In some cases, the specific operation performed by the base station in the present disclosure may be performed by its upper node. In a network consisting of one or more network nodes having a base station, various operations performed for communication with the terminal are performed by the base station and other network nodes other than the base station (for example, MME or). It is clear that it can be done by at least one of (but not limited to, S-GW, etc.). Although the case where there is one network node other than the base station is illustrated above, it may be a combination of a plurality of other network nodes (for example, MME and S-GW).

Information and signals (information, etc.) can be output from the upper layer (or lower layer) to the lower layer (or upper layer). Input / output may be performed via a plurality of network nodes.

The input / output information may be stored in a specific location (for example, memory) or may be managed using a management table. Input / output information can be overwritten, updated, or added. The output information may be deleted. The input information may be transmitted to another device.

The determination may be made by a value represented by 1 bit (0 or 1), by a boolean value (Boolean: true or false), or by comparing numerical values (for example, a predetermined value). It may be done by comparison with the value).

Each aspect / embodiment described in the present disclosure may be used alone, in combination, or switched with execution. Further, the notification of predetermined information (for example, the notification of "being X") is not limited to the explicit one, but is performed implicitly (for example, the notification of the predetermined information is not performed). May be good.

Software, whether referred to as software, firmware, middleware, microcode, hardware description language, or by any other name, is an instruction, instruction set, code, code segment, program code, program, subprogram, software module. , Applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, features, etc. should be broadly interpreted.

Further, software, instructions, information, etc. may be transmitted and received via a transmission medium. For example, a website, where the software uses at least one of wired technology (coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and wireless technology (infrared, microwave, etc.). When transmitted from a server, or other remote source, at least one of these wired and wireless technologies is included within the definition of transmission medium.

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

Note that the terms explained in the present disclosure and the terms necessary for understanding the present 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). Also, the signal may be a message. Further, the component carrier (CC) may be referred to as a carrier frequency, a cell, a frequency carrier, or the like.

The terms "system" and "network" used in this disclosure are used interchangeably.

In addition, the information, parameters, etc. described in the present disclosure may be expressed using absolute values, relative values from predetermined values, or using other corresponding information. It may be represented. For example, the radio resource may be one indicated by an index.

The names used for the above parameters are not limited in any respect. Further, mathematical formulas and the like using these parameters may differ from those explicitly disclosed in this disclosure. Since various channels (eg, PUCCH, PDCCH, etc.) and information elements can be identified by any suitable name, the various names assigned to these various channels and information elements are in any respect limited names. is not it.

In this disclosure, "Base Station (BS)", "Wireless Base Station", "Fixed Station", "NodeB", "eNodeB (eNB)", "gNodeB (gNB)", " "Access point", "transmission point", "reception point", "transmission / reception point", "cell", "sector", "cell group", "cell group" Terms such as "carrier" and "component carrier" can be used interchangeably. Base stations are sometimes referred to by terms such as macrocells, small cells, femtocells, and picocells.

The base station can accommodate one or more (for example, three) cells (also called sectors). When a base station accommodates multiple cells, the entire coverage area of the base station can be divided into multiple smaller areas, each smaller area being a base station subsystem (eg, a small indoor base station (Remote Radio)). Communication services can also be provided by Head: RRH).

The term "cell" or "sector" refers to a base station that provides communication services in this coverage, and part or all of the coverage area of at least one of the base station subsystems.

In the present disclosure, terms such as "mobile station (MS)", "user terminal", "user equipment (UE)", and "terminal" may be used interchangeably. ..

Mobile stations can be used by those skilled in the art as subscriber stations, mobile units, subscriber units, wireless units, remote units, mobile devices, wireless devices, wireless communication devices, remote devices, mobile subscriber stations, access terminals, mobile terminals, wireless. It may also be referred to as a terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable term.

At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a communication device, or the like. At least one of the base station and the mobile station may be a device mounted on the mobile body, the mobile body itself, or the like. The moving body may be a vehicle (eg, car, airplane, etc.), an unmanned moving body (eg, drone, self-driving car, etc.), or a robot (manned or unmanned). ) May be. It should be noted that at least one of the base station and the mobile station includes a device that does not necessarily move during communication operation. For example, at least one of a base station and a mobile station may be an Internet of Things (IoT) device such as a sensor.

Further, the base station in the present disclosure may be read as a mobile station (user terminal, the same applies hereinafter). For example, communication between a base station and a mobile station has been replaced with communication between a plurality of mobile stations (for example, it may be called Device-to-Device (D2D), Vehicle-to-Everything (V2X), etc.). Each aspect / embodiment of the present disclosure may be applied to the configuration. In this case, the mobile station may have the functions of the base station. In addition, words such as "up" and "down" may be read as words corresponding to communication between terminals (for example, "side"). For example, an uplink channel, a downlink channel, and the like may be read as a side channel.

Similarly, the mobile station in the present disclosure may be read as a base station. In this case, the base station may have the functions of the mobile station.

The wireless frame may be composed of one or more frames in the time domain. Each one or more frames in the time domain may be referred to as a subframe. Subframes may further consist of one or more slots in the time domain. The subframe may have a fixed time length (eg, 1 ms) that is independent of numerology.

The numerology may be a communication parameter that applies to at least one of the transmission and reception of a signal or channel. Numerology includes, for example, SubCarrier Spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame configuration, transmission / reception. At least one of a specific filtering process performed by the machine in the frequency domain, a specific windowing process performed by the transceiver in the time domain, and the like may be indicated.

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

The slot may include a plurality of mini slots. Each minislot may consist of one or more symbols in the time domain. Further, the mini slot may be referred to as a sub slot. A minislot may consist of a smaller number of symbols than the slot. PDSCH (or PUSCH) transmitted in time units larger than the minislot may be referred to as PDSCH (or PUSCH) mapping type A. The PDSCH (or PUSCH) transmitted using the minislot may be referred to as PDSCH (or PUSCH) mapping type B.

The wireless frame, subframe, slot, minislot and symbol all represent the time unit when transmitting a signal. The radio frame, subframe, slot, minislot and symbol may have different names corresponding to each.

For example, one subframe may be referred to as a transmission time interval (TTI), a plurality of consecutive subframes may be referred to as TTI, and one slot or one minislot may be referred to as TTI. That is, at least one of the subframe and TTI may be a subframe (1ms) in existing LTE, a period shorter than 1ms (eg, 1-13 symbols), or a period longer than 1ms. It may be. The unit representing TTI may be called a slot, a mini slot, or the like instead of a subframe.

Here, TTI refers to, for example, the minimum time unit of scheduling in wireless communication. For example, in an LTE system, a base station schedules each user terminal to allocate radio resources (frequency bandwidth that can be used in each user terminal, transmission power, etc.) in TTI units. The definition of TTI is not limited to this.

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

When one slot or one minislot is called a TTI, one or more TTIs (that is, one or more slots or one or more minislots) may be the minimum time unit for scheduling. Further, the number of slots (number of mini-slots) constituting the minimum time unit of the scheduling may be controlled.

A TTI having a time length of 1 ms may be called a normal TTI (TTI in LTE Rel.8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, a long subframe, a slot, or the like. TTIs shorter than normal TTIs may also be referred to as shortened TTIs, short TTIs, partial TTIs (partial or fractional TTIs), shortened subframes, short subframes, minislots, subslots, slots, and the like.

Note that long TTIs (eg, normal TTIs, subframes, etc.) may be read as TTIs with a time length of more than 1 ms, and short TTIs (eg, shortened TTIs, etc.) are less than the TTI length of long TTIs and 1 ms. It may be read as a TTI having the above TTI length.

The resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may include one or a plurality of continuous subcarriers in the frequency domain. The number of subcarriers contained in RB may be the same regardless of numerology, and may be, for example, 12. The number of subcarriers contained in the RB may be determined based on numerology.

Further, the time domain of RB may include one or more symbols, and may have a length of 1 slot, 1 mini slot, 1 subframe, or 1 TTI. Each 1TTI, 1 subframe, etc. may be composed of one or a plurality of resource blocks.

One or more RBs include a physical resource block (Physical RB: PRB), a sub-carrier group (Sub-Carrier Group: SCG), a resource element group (Resource Element Group: REG), a PRB pair, an RB pair, and the like. May be called.

Further, the resource block may be composed of one or a plurality of resource elements (ResourceElement: RE). For example, 1RE may be a radio resource area of 1 subcarrier and 1 symbol.

Bandwidth Part (BWP) (which may also be called partial bandwidth, etc.) may represent a subset of consecutive common resource blocks (RBs) for a neurology in a carrier. good. Here, the common RB may be specified by the index of the RB with respect to the common reference point of the carrier. PRBs may be defined in a BWP and numbered within that BWP.

BWP may include BWP for UL (UL BWP) and BWP for DL (DL BWP). One or more BWPs may be set in one carrier for the UE.

At least one of the configured BWPs may be active, and the UE may not expect to send or receive a given signal / channel outside the active BWP. In addition, "cell", "carrier" and the like in this disclosure may be read as "BWP".

The above-mentioned structures such as wireless frames, subframes, slots, minislots and symbols are merely examples. For example, the number of subframes contained in a wireless frame, the number of slots per subframe or wireless frame, the number of minislots contained within a slot, the number of symbols and RBs contained in a slot or minislot, and the number of RBs. The number of subcarriers, the number of symbols in the TTI, the symbol length, the cyclic prefix (CP) length, and other configurations can be changed in various ways.

The terms "connected", "coupled", or any variation thereof, mean any direct or indirect connection or connection between two or more elements, and each other. It can include the presence of one or more intermediate elements between two "connected" or "combined" elements. The connection or connection between the elements may be physical, logical, or a combination thereof. For example, "connection" may be read as "access". As used in the present disclosure, the two elements use at least one of one or more wires, cables and printed electrical connections, and, as some non-limiting and non-comprehensive examples, the radio frequency domain. , Electromagnetic energies with wavelengths in the microwave and light (both visible and invisible) regions, etc., can be considered to be "connected" or "coupled" to each other.

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

The phrase "based on" as used in this disclosure does not mean "based on" unless otherwise stated. In other words, the statement "based on" means both "based only" and "at least based on".

The "means" in the configuration of each of the above devices may be replaced with a "part", a "circuit", a "device", or the like.

Any reference to elements using designations such as "first", "second" as used in this disclosure does not generally limit the quantity or order of those elements. These designations can be used in the present disclosure as a convenient way to distinguish between two or more elements. Thus, references to the first and second elements do not mean that only two elements can be adopted there, or that the first element must somehow precede the second element.

When "include", "including" and variations thereof are used in the present disclosure, these terms are as comprehensive as the term "comprising". Is intended. Moreover, the term "or" used in the present disclosure is intended not to be an exclusive OR.

In the present disclosure, if articles are added by translation, for example, a, an and the in English, the disclosure may include that the nouns following these articles are plural.

The terms "determining" and "determining" used in this disclosure may include a wide variety of actions. "Judgment" and "decision" are, for example, judgment (judging), calculation (calculating), calculation (computing), processing (processing), derivation (deriving), investigation (investigating), search (looking up, search, inquiry). (For example, searching in a table, database or another data structure), ascertaining may be regarded as "judgment" or "decision". Also, "judgment" and "decision" are receiving (for example, receiving information), transmitting (for example, transmitting information), input (input), output (output), and access. (Accessing) (for example, accessing data in memory) may be regarded as "judgment" or "decision". In addition, "judgment" and "decision" mean that the things such as solving, selecting, choosing, establishing, and comparing are regarded as "judgment" and "decision". Can include. That is, "judgment" and "decision" may include considering some action as "judgment" and "decision". Further, "judgment (decision)" may be read as "assuming", "expecting", "considering" and the like.

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

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 in the present disclosure. The present disclosure may be implemented as an amendment or modification without departing from the purpose and scope of the present disclosure, which is determined by the description of the scope of claims. Therefore, the description of the present disclosure is for the purpose of exemplary explanation and does not have any limiting meaning to the present disclosure.

10 wireless communication system 50 CU
100A, 100B, 100C Wireless communication node 110 Wireless transmitter 120 Wireless receiver 130 NW IF section 140 IAB node connection section 150 Control section 161 Wireless transmitter section 162 Wireless receiver 170 Upper node connection section 180 Lower node connection section 190 Control section UE 200
1001 Processor 1002 Memory 1003 Storage 1004 Communication Device 1005 Input Device 1006 Output Device 1007 Bus

Claims

The upper node connection part used for connecting to the upper node and
The lower node connection part used for connecting to the lower node,
A wireless communication node including a transmission unit that transmits resource information indicating whether a flexible resource for a lower node is used in a downlink direction or an uplink direction to the upper node or a network.
The wireless communication node according to claim 1, wherein the transmission unit transmits the resource information indicating in which direction the flexible resource is used, the downlink or the uplink, for each slot or symbol.
The wireless communication node according to claim 1, wherein the transmission unit transmits the resource information indicating the number of the flexible resources used in the direction of the downlink or the uplink.
The wireless communication node according to any one of claims 1 to 3, wherein the time range of the resource information is variable.
A receiver that receives resource information from the lower node indicating whether the flexible resource for the lower node is used in the downlink or uplink direction, and
A wireless communication node including a control unit that gives priority to the set direction of the flexible resource when the direction of the flexible resource indicated by the resource information is different from the direction of the set flexible resource.