Wireless communication nodes

Abstract

A wireless communication node (100B) reports power control information used for downlink transmission power control in the upper node (100A) to the upper node (100A).

Description

Technical Field

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

[0002] In the 3rd Generation Partnership Project (3GPP), Long Term Evolution (LTE) is standardized, and LTE-Advanced (hereinafter referred to as LTE including LTE-Advanced) is standardized for the purpose of further speeding up LTE. In addition, subsequent systems of LTE such as 5G New Radio (NR) or Next Generation (NG) are further standardized.

[0003] For example, in the radio access network (RAN) of NR, research is underway on integrated access and backhaul (IAB) (refer to non-patent document 1) that integrates wireless access to terminals (User Equipment, UE) with wireless backhaul between wireless communication nodes such as wireless base stations (gNBs).

[0004] In the IAB, an IAB node has a function for connecting to a parent node (also referred to as an IAB donor), namely a mobile terminal (MT), and a function for connecting to a child node or a UE, namely a distributed unit (DU).

[0005] In 3GPP Release 16, wireless access and wireless backhaul are based on half-duplex communication and time division multiplexing (TDM). In Release-17, the application of frequency division multiplexing (FDM), space division multiplexing (SDM) and full-duplex communication (Full-duplex) is studied (Non-Patent Document 2). In other words, the simultaneous operation of MT and DU is studied.

[0006] Prior art literature

[0007] Non-patent literature

[0008] Non-patent document 1: 3GPP TR 38.874 V16.0.0, 3rd Generation Partnership Project; Technical Specification Group Radio Access Network; NR; Study on Integrated Access and Backhaul; (Release 16), 3GPP, December 2018

[0009] Non-patent document 2: "New WID on Enhancements to Integrated Access and Backhaul", RP-192521, 3GPP TSG RAN Meeting #86, 3GPP, December 2019 Summary of the invention

[0010] However, the simultaneous operation of MT and DU has the following problems: Specifically, when MT and DU use the same time resources to receive wireless signals, it is considered that the power of the wireless signal received by MT and the power of the wireless signal received by DU (hereinafter referred to as received power) will be different.

[0011] When the difference in the received power is large, the wireless signal with a smaller received power cannot be received normally because the wireless signal with a larger received power will interfere with the wireless signal with a smaller received power.

[0012] Furthermore, when a receiver is shared by the MT and the DU in a wireless communication node, if the receiver coincides with a wireless signal with a larger receiving power, the wireless signal with a smaller receiving power may deviate from the receivable range.

[0013] Therefore, the following disclosure is made in view of the above situation, and its purpose is to provide a wireless communication node that can normally receive wireless signals even when the Mobile Termination (MT) and the Distributed Unit (DU) are operating simultaneously in Integrated Access and Backhaul (IAB).

[0014] One embodiment of the present disclosure provides a wireless communication node (wireless communication node 100B), which has: a transceiver unit (wireless transmission unit 161 and wireless reception unit 162) that transmits and receives wireless signals from an upper node (wireless communication node 100A) constituting an integrated access backhaul; and a control unit (control unit 170) that reports power control information used for transmission power control of a downlink in the upper node to the upper node. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0016] Figure 2 This is a diagram showing an example of the basic structure of IAB.

[0017] Figure 3 FIG. 4 is a functional block diagram of the wireless communication node 100A.

[0018] Figure 4 FIG. 4 is a functional block diagram of the wireless communication node 100B.

[0019] Figure 5 The diagram shows an example of a scenario in which transmission power control that can avoid transmission power imbalance is required.

[0020] Figure 6 This is a diagram showing an example of the application period of the report according to the first operation example.

[0021] Fig. 7A This is a diagram showing an example (part 1) of resources to which a report according to action example 1 (option 1-1) is applied.

[0022] Figure 7B This is a diagram showing an example (part 1) of resources to which a report according to action example 1 (option 1-1) is applied.

[0023] Figure 7C This is a diagram showing an example (part 1) of resources to which a report according to action example 1 (option 1-1) is applied.

[0024] Fig. 8A This is a diagram showing an example (part 2) of resources to which the report according to the example 1 of action (option 1-1) is applied.

[0025] Figure 8B This is a diagram showing an example (part 2) of resources to which the report according to the example 1 of action (option 1-1) is applied.

[0026] Fig.9A This is a diagram showing an example of resources to which the report according to the action example 1 (option 1-2) is applied.

[0027] Fig. 9B This is a diagram showing an example of resources to which the report according to the action example 1 (option 1-2) is applied.

[0028] Fig. 10A This is a diagram showing a configuration example of a bit field according to Action Example 1 (Option 2-1).

[0029] Fig. 10B This is a diagram showing a configuration example of a bit field according to Action Example 1 (Option 2-1).

[0030] Fig. 10C This is a diagram showing a configuration example of a bit field according to Action Example 1 (Option 2-1).

[0031] Fig.11 This is a diagram showing an example of resources to which the report according to the action example 1 (option 2-2) is applied.

[0032] Fig. 12A This is a diagram showing an example of resources to which the report according to Action Example 3 (Option 1) is applied.

[0033] Fig. 12B This is a diagram showing an example of resources to which the report according to Action Example 3 (Option 1) is applied.

[0034] Fig.13A This is a diagram showing an example of resources to which the report according to Action Example 3 (Option 2) is applied.

[0035] Fig. 13B This is a diagram showing an example of resources to which the report according to Action Example 3 (Option 2) is applied.

[0036] Fig.14 1 is a diagram showing an example of the hardware configuration of the CU 50 , the wireless communication nodes 100A to 100C, and the UE 200 . DETAILED DESCRIPTION

[0037] Hereinafter, the embodiments will be described based on the drawings. In addition, the same or similar reference numerals are given to the same functions and structures, and the description thereof will be appropriately omitted.

[0038] (1) Overall schematic structure of wireless communication system

[0039] Figure 1 1 is a diagram schematically showing the overall structure of a wireless communication system 10 according to the present embodiment. The wireless communication system 10 is a wireless communication system based on 5G New Radio (NR), and is composed of a plurality of wireless communication nodes and terminals.

[0040] Specifically, the wireless communication system 10 includes wireless communication nodes 100A, 100B, 100C, and a terminal 200 (hereinafter referred to as UE 200, User Equipment).

[0041] The wireless communication nodes 100A, 100B, and 100C are capable of setting up wireless access with the UE 200 and wireless backhaul (BH) between the wireless communication nodes. Specifically, a backhaul (transmission path) based on a wireless link is set up 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.

[0042] Therefore, a structure in which the radio access to the UE 200 and the radio backhaul between the radio communication nodes are integrated is called Integrated Access and Backhaul (IAB).

[0043] IAB reuses existing functions 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), as well as corresponding interfaces such as NR Uu (MT to gNB / DU), F1, NG, X2 and N4 are used as the baseline.

[0044] The wireless communication node 100A is connected to the NR radio access network (NG-RAN) and the core network (Next Generation Core (NGC) or 5GC) via a wired transmission path such as optical fiber transmission. The NG-RAN / NGC includes a central unit (Central Unit) 50 (hereinafter referred to as CU 50) as a communication node. In addition, the NG-RAN and NGC can be included and simply referred to as a "network".

[0045] In addition, CU 50 may be composed of any one of the above-mentioned UPF, AMF, SMF or a combination thereof. Alternatively, CU 50 may be the above-mentioned gNB-CU.

[0046] Figure 2 : is a diagram showing a basic structural example of IAB. Figure 2 As shown, 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) constitute an IAB node in the IAB. In addition, the parent node can be called an IAB donor.

[0047] The child node in IAB consists of Figure 1 Alternatively, UE 200 may constitute a child node.

[0048] A wireless link is set up between the parent node and the IAB node. Specifically, a wireless link called Link_parent is set up.

[0049] A wireless link is set up between the IAB node and the child node. Specifically, a wireless link called Link_child is set up.

[0050] This wireless link set up between wireless communication nodes is called a wireless backhaul link. Link_parent consists of a DL parent backhaul (DL Parent BH) in the downlink (DL) direction and an UL parent backhaul (UL Parent BH) in the uplink (UL) direction. Link_child consists of a DL child backhaul (DL Child BH) in the DL direction and an UL child backhaul (UL Child BH) in the UL direction.

[0051] That is, in IAB, the direction from the parent node toward the child node (including the UE 200) is the DL direction, and the direction from the child node toward the parent node is the UL direction.

[0052] In addition, the radio link established between the UE 200 and the IAB node or the parent node is called a radio access link. Specifically, the radio link is composed of a DL access (DL Access) in the DL direction and a UL access (UL Access) in the UL direction.

[0053] The IAB node has a function of connecting to a parent node (also called an upper node), namely a mobile terminal (MT), and a function of connecting to a child node (or UE 200), namely a distributed unit (DU). In addition, a child node may also be called a lower node.

[0054] Similarly, the parent node has an MT for connecting to an upper node and a DU for connecting to a lower node such as an IAB node. In addition, the parent node may have a CU (Central Unit) instead of the MT.

[0055] In addition, similar to the IAB node and the parent node, the child node also has an MT for connecting to an upper node such as the IAB node, and a DU for connecting to a lower node such as the UE 200 .

[0056] Regarding the wireless resources used by the DU, DL, UL, and flexible time-resource (D / U / F) are classified into any type of "Hard", "Soft", or "Not Available" (H / S / NA) from the perspective of the DU. In addition, "Soft" (S) also specifies whether it is available or not available.

[0057] in addition, Figure 2 The example of the IAB structure shown uses CU / DU splitting, but the structure of the IAB is not necessarily limited to this structure. For example, in the wireless backhaul, the IAB can be formed by a tunnel using GPRS Tunneling Protocol (GTP)-U / User Datagram Protocol (UDP) / Internet Protocol (IP).

[0058] The main advantage of such IAB is the ability to flexibly and densely configure NR cells without densifying the transmission network. IAB can be applied to a variety of scenarios such as outdoor small cell configuration, indoor and mobile relay equipment (for example, in buses and trains).

[0059] In addition, if Figure 1 as well as Figure 2 As shown, IAB can support deployment based on independent (SA) only NR, or deployment based on non-independent (NSA) including other RATs (LTE, etc.).

[0060] In this embodiment, wireless access and wireless backhaul can operate as half-duplex communication (Half-duplex) or full-duplex communication (Full-duplex).

[0061] In addition, as a multiplexing method, time division multiplexing (TDM), frequency division multiplexing (FDM) and space division multiplexing (SDM) can be used. That is, in this embodiment, FDM / SDM is used to realize the simultaneous operation of the DU and MT of the IAB node.

[0062] (2) Functional block structure of wireless communication system

[0063] Next, the functional block configuration of the wireless communication node 100A, the wireless communication node 100B, and the UE 200 constituting the wireless communication system 10 will be described.

[0064] (2.1) Wireless communication node 100A

[0065] Figure 3 FIG. 1 is a functional block diagram of the wireless communication node 100A constituting the parent node. Figure 3 As shown, the wireless communication node 100A includes a wireless transmission unit 110 , a wireless reception unit 120 , a NW IF unit 130 , a power control information reception unit 140 , and a control unit 150 .

[0066] The wireless transmission unit 110 transmits a wireless signal in accordance with the 5G standard. In addition, the wireless reception unit 120 receives a wireless signal in accordance with the 5G standard. 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.

[0067] In this embodiment, the wireless communication node 100A has the functions of MT and DU, and the wireless transmission unit 110 and the wireless reception unit 120 both transmit and receive wireless signals corresponding to MT / DU.

[0068] The NW IF unit 130 provides a communication interface for realizing connection with the NGC side, etc. For example, the NW IF unit 130 may include interfaces such as X2, Xn, N2, and N3.

[0069] The power control information receiving unit 140 receives power control information transmitted from the IAB node. Specifically, the power control information receiving unit 140 may receive power control information for DL ​​transmission power control in the parent node (ie, the wireless communication node 100A).

[0070] The power control information may be any information that enables DL transmission power control. For example, it may be information that directly indicates that the DL transmission power needs to be reduced, or it may be a numerical value related to DL transmission power control. The numerical value may be, for example, the value of the UL reception power in the IAB node, or the difference between the DL reception power and the UL reception power in the IAB node.

[0071] Alternatively, the power control information may be composed of a combination of information directly indicating that the DL transmission power needs to be reduced and a numerical value related to the DL transmission power control.

[0072] The control unit 150 controls each functional block constituting the wireless communication node 100A. In particular, in the present embodiment, the control unit 150 can control the DL transmission power of the DU based on the power control information received by the power control information receiving unit 140.

[0073] (2.2) Wireless communication node 100B

[0074] Figure 4 FIG. 1 is a functional block diagram of a wireless communication node 100B constituting an IAB node. Figure 4 As shown, the wireless communication node 100B includes a wireless transmission unit 161 , a wireless reception unit 162 , a control unit 170 , and a power control information transmission unit 180 .

[0075] The wireless transmission unit 161 transmits a wireless signal in accordance with the 5G specification. In addition, the wireless reception unit 162 receives a wireless signal in accordance with the 5G specification. In this embodiment, the wireless transmission unit 161 and the wireless reception unit 162 perform wireless communication with the wireless communication node 100A constituting the parent node, and wireless communication with the child node (including the case of UE200).

[0076] In this embodiment, the wireless transmission unit 161 and the wireless reception unit 162 constitute a transceiver that transmits and receives wireless signals with an upper node (specifically, the wireless communication node 100A constituting an integrated access backhaul (IAB)).

[0077] The control unit 170 controls each functional block constituting the wireless communication node 100B. In particular, in the present embodiment, the control unit 170 can perform processing related to power control information used for transmission power control in a parent node (upper node) or a child node (lower node).

[0078] Specifically, the control unit 170 can report power control information for DL ​​transmission power control in the upper node to the upper node. The control unit 170 can control the power control information transmission unit 180 to transmit appropriate power control information to the upper node.

[0079] As described above, the power control information is not particularly limited as long as it is information that can perform DL transmission power control in an upper node such as a parent node.

[0080] For example, the control unit 170 can report power control information indicating whether DL transmission power control is necessary in the upper node. Whether transmission power control is necessary may simply indicate whether transmission power control is necessary, or may explicitly request a reduction in DL transmission power.

[0081] In addition, the control unit 170 can also report power control information including a numerical value related to the DL transmission power in the upper node. As described above, the numerical value may be, for example, the value of the UL reception power in the IAB node, or the difference between the DL reception power and the UL reception power in the IAB node. In addition, other specific examples of the numerical value will be described later.

[0082] The control unit 170 may report the above-mentioned power control information in response to an instruction (trigger) from an upper node (for example, a parent node (radio communication node 100A)).

[0083] In addition, the power control information may include information specifying resources constituting the object of DL transmission power control in the upper node. That is, the upper node may control DL transmission power (for example, reduce DL transmission power) only for the specified resources (which may also be called radio resources).

[0084] The power control information transmission unit 180 may transmit the power control information to a parent node (upper node) or a child node (lower node).

[0085] Specifically, the power control information transmitting unit 180 can transmit the power control information to the upper node according to the control performed by the control unit 170. For example, the power control information can be transmitted through uplink control information (UCI), medium access control-control element (MAC-CE), or signaling of a higher layer (e.g., radio resource control layer (RRC)).

[0086] (3) Operation of wireless communication system

[0087] Next, the operation of the wireless communication system 10 will be described. Specifically, the operation of controlling the DL transmission power between the parent node (upper node) and the IAB node will be described.

[0088] (3.1) Multiplexing and communication methods in IAB

[0089] When FDM or SDM is applied in wireless backhaul or wireless access, especially within the antenna panel, the transmission power of the wireless backhaul is usually much higher than the transmission power of the wireless access. Therefore, due to the power imbalance between the wireless backhaul and the wireless access, the receiving performance in the IAB node, etc. may be reduced.

[0090] Specifically, in the following scenario, it is necessary to perform transmission power control that can avoid imbalance in transmission power.

[0091] Figure 5An example of a scenario in which transmission power control that can avoid transmission power imbalance is required is shown. Figure 5 As shown, four scenarios are listed, namely, scenarios 1 to 4. Each scenario is from the perspective of the IAB node (wireless communication node 100B), and is described as follows.

[0092] Scenario 1: Simultaneous reception of UL Child BH and UL Access in the IAB node

[0093] Scenario 2: Simultaneous reception of DL Parent BH and DL Parent BH in IAB node

[0094] Scenario 3: Simultaneous reception of DL Parent BH and UL Child BH in IAB node

[0095] Scenario 4: Simultaneous reception of UL Child BH and UL Access in the IAB node

[0096] In scenarios 2 to 4, in order to avoid imbalance in transmission power, it may be necessary to perform DL transmission power control of the parent node (wireless communication node 100A).

[0097] In addition, in IAB, when DL Parent BH and UL Access are received simultaneously, the transmission power of DL Parent BH may affect UL Access. Therefore, in allocating DL transmission power in the parent node, the state (channel status) of UL Access in the IAB node needs to be considered.

[0098] Information assisting the transmission power control (may also be referred to as power control information or auxiliary information) may be reported from the IAB node to the parent node.

[0099] (3.2) Action example

[0100] Hereinafter, when the MT and DU of the IAB node operate by FDM, SDM or Full Duplex, an operation example is described in which the reception power of each of the MT and the DU is averaged to enable simultaneous reception of the MT and the DU.

[0101] (3.2.1) Operation overview

[0102] The outline of the operation example described below is as follows.

[0103] (Action Example 1): In order to perform DL transmission power control, the IAB node reports to the parent node

[0104] (Option 1): The IAB node reports whether it needs to make the parent node reduce the DL transmission power

[0105] (Option 1-1): Use 1-bit reporting to apply the control within a certain interval (can also be replaced by a certain period. The same applies below)

[0106] (Option 1-2): Use a bitmap, reporting 1 bit for each resource

[0107] (Option 2): The IAB node reports values ​​related to DL transmit power control

[0108] (Option 2-1): The IAB node reports a value related to DL transmit power control and applies it within a certain interval.

[0109] Report content (example): UL received power, difference between DL received power and UL received power, expected DL received power, reduction in DL received power, expected DL transmit power, reduction in DL transmit power

[0110] Reported value (examples): absolute value, deviation from determined value, deviation from first reported value, deviation from immediately previous reported value

[0111] Bit field configuration (example): a value uniquely determined for each bit field, a value having a range for each bit field, a multiplication value for a coefficient of each bit field

[0112] (Option 2-2): Report continuous values ​​within a certain interval related to DL transmission power control

[0113] (Option 3): Combination of Option 1 and Option 2

[0114] IAB node reports the necessity of DL transmit power control and the values ​​related to power control

[0115] (Action Example 2): Reporting method for DL ​​transmission power control

[0116] (Option 1): Parent node triggers report

[0117] (Option 1-1): Use UCI to report periodically, semi-persistently, or aperiodic

[0118] (Option 1-2): Use MAC CE or higher layers to report periodically, semi-persistently, or aperiodically

[0119] (Option 2): IAB node triggers reporting

[0120] (Action Example 3): Control actions in the parent node and IAB node

[0121] (Option 1): Case of (Option 1) of (Action Example 1) (reporting whether it is necessary to reduce the DL transmission power)

[0122] No report exists: DL transmit power depends on the installation, or the parent node reduces DL transmit power

[0123] There is a reporting situation: DL transmit power depends on the installation, the parent node reduces the DL transmit power, or only for the indicated specific resources, the parent node reduces the DL transmit power

[0124] (Option 2): Case of (Option 2) of (Operation Example 1) (Reporting a value related to DL transmission power control)

[0125] No report exists: DL transmit power depends on the installation, or the parent node reduces DL transmit power

[0126] There is a reporting situation: DL transmit power depends on the installation, the parent node reduces the DL transmit power, or only for the indicated specific resources, the parent node reduces the DL transmit power

[0127] (3.2.2) Action Example 1

[0128] In this operation example, several options can be set for the report content as described above. Each option will be described in more detail below.

[0129] (3.2.2.1) Option 1-1

[0130] When a 1-bit report is used, the operation can be performed as described below.

[0131] Alt.1: When UL Access is being received, for example, it may be set to "1". When it is set to "0", it means that UL Access is not being received.

[0132] Alt.2: When UL Access is received and the power difference between DL Parent BH and UL Access exceeds the threshold, for example, it can be set to "1". When it is set to "0", it means that there is no UL Access reception or the power difference between DL Parent BH and UL Access is lower than the threshold. In addition, the threshold can be defined in advance by the specification. Or it can be set by RRC.

[0133] Alt.3: When UL Access is received and the power of DL Parent BHL exceeds the threshold, for example, it can be set to "1". When it is set to "0", it can indicate that there is no UL Access reception or the power of DL Parent BH is lower than the threshold. In addition, the threshold can be pre-defined by the specification. Or it can be set by RRC.

[0134] Alt.4: When UL Access is received and the power of UL Access is lower than the threshold, for example, it can be set to "1". When it is set to "0", it can indicate that there is no UL Access reception or the power of UL Access exceeds the threshold. In addition, the threshold can be defined in advance by the specification. Or it can be set by RRC.

[0135] Alt.5: For example, when it is set to "1", it may indicate that the DL transmission power needs to be reduced, and when it is set to "0", it may indicate that the DL transmission power does not need to be reduced. The setting of "0" or "1" may depend on the implementation.

[0136] Figure 6 An example of the application period of the report involved in Action Example 1 is shown. Figure 6 As shown, n is the timing of sending the report, and the content of the report can be applied in the interval from n+k1 to n+k2.

[0137] In addition, the granularity of n / k1 / k2 can be set to time slots, codewords (also called OFDM codewords), or codeword groups.

[0138] k1 and k2 may be predefined by the specification, or may be set by RRC. Alternatively, k2 may be omitted and the content of the report may be applied from n+k1 until the next report is received.

[0139] Fig. 7A , Figure 7B as well as Figure 7C An example (part 1) of resources to which the report related to action example 1 (option 1-1) is applied is shown. Fig. 8A and Figure 8B An example of a resource to which the report involved in Action Example 1 (Option 1-1) is applied (part 2) is shown. The shaded portion in the figure shows an example of a resource to which the report content is applied (the same applies below). The above-mentioned report by the IAB node can be applied to the following resources.

[0140] Alt.1: The report is applied to all resources associated with MT timing

[0141] Alt.2: The report is applied to all resources associated with the DU timing

[0142] Alt.3: The report applies to MT resources of any of the following resource types

[0143] MT-DL / MT-F

[0144] Duplicate with MT-DL / MT-F

[0145] DU-hard-UL / DU-hard-F

[0146] DU-soft-UL / DU-soft-F

[0147] DU-soft-UL / DU-soft-F indicated as IA

[0148] In case of supporting reporting of the link direction of DU-F, DU-hard-F / DU-soft-F / DU-soft-F reported as IA may be reported as UL.

[0149] In addition, "IA" indicates that the DU resource is explicitly or implicitly indicated as available. In addition, "INA" indicates that the DU resource is explicitly or implicitly indicated as unavailable.

[0150] In addition, the granularity of resources can be set to slot / symbol / symbol group. For example, in the case where the slot contains symbols of the resource types mentioned above, the reporting can be applied in the MT slot.

[0151] Alt.4: Reports can be applied to any of the following DU resource types

[0152] DU-hard-UL / DU-hard-F

[0153] DU-soft-UL / DU-soft-F / DU-soft-UL indicated as IA

[0154] In case of link direction reporting supporting DU-F, DU-hard-F / DU-soft-F / DU-soft-F reported as IA may be reported as UL

[0155] DU-hard-UL / DU-hard-F overlaps with MT-D / MT-F

[0156] DU / soft-UL / DU-soft-F / DU-soft-UL that indicates duplication of IA and MT-D / MT-F can be expressed as IA / DU-soft-F

[0157] In the case of reporting of the link direction supporting DU-F, DU-hard-F / DU-soft-F / DU-soft-F indicated as "IA reported as duplicate of IA and MT-D / MT-F"

[0158] In addition, the granularity of resources can be set to slot / symbol / symbol group. For example, in the case where the slot contains symbols of the above resource types, the report can be applied in the DU slot.

[0159] (3.2.2.2) Option 1-2

[0160] In this option, a 1-bit bitmap can be reported for each resource at each certain period. Fig.9A and Fig. 9B An example of resources to which the report related to Action Example 1 (option 1-2) is applied is shown.

[0161] In this option, the granularity of resources can also be set to time slot / symbol / symbol group. For example, for each time slot, 1 bit of information can be reported.

[0162] The report contents for each resource may be the same as those for option 1-1. Also, the period for which the report is applied may be the same as that for option 1-1.

[0163] For example, n is the timing of sending the report, and the content of the report by the IAB node can be applied in the interval from n+k1 to n+k2 (see Figure 6 ). In addition, regarding the resource type to which the report is applied, it can also be the same as option 1-1.

[0164] (3.2.2.3) Option 2-1

[0165] In this option, the IAB node can report the reference power (reference power) of the parent node for DL ​​transmission power control, and can report a reference value within a certain period, and the content of the report is applied to the period.

[0166] The reference power reported by the IAB node may be any of the following.

[0167] Alt.1: UL receive power in IAB node

[0168] Alt.2: Difference between DL received power and UL received power in IAB node

[0169] In addition, in Alt.1 / 2, when the parent node is able to estimate the DL path loss between the parent node and the IAB node (for example, with channel-related DL reference signal received power (Reference Signal Received Power: RSRP) or UL radio signal (RS) measurement), in order to avoid power imbalance, the parent node can determine the DL transmit power based on the UL received power in the IAB node and the DL path loss.

[0170] Alt.3: Expected DL Rx power in IAB node

[0171] Alt.4: Expecting reduction in DL Rx power in IAB nodes

[0172] In addition, in Alt.3 / 4, when the parent node is able to estimate the DL path loss between the parent node and the IAB node (for example, with channel-related DL Reference Signal Received Power (RSRP) or UL radio signal (RS) measurement), in order to avoid power imbalance, the parent node can determine the DL transmit power based on the expected DL received power and the DL path loss.

[0173] Alt.5: Expected DL transmit power in the parent node

[0174] Alt.6: Expected reduction in DL transmission power in the parent node

[0175] In addition, when using Alt.5 / 6, the parent node can determine the DL transmission power based on the reported expected DL transmission power.

[0176] In addition, the above-mentioned reference values ​​may be reported as any of the following values.

[0177] Alt.1: Absolute value

[0178] Alt.2: An offset value from the value pre-defined by the specification. Or set by RRC

[0179] Alt.3: offset from the original reported value

[0180] The initial report can be set to an absolute value or a predefined value or an offset from a set value.

[0181] Alt.4: The offset from the value reported immediately before

[0182] Fig. 10A , Fig. 10B as well as Fig. 10C A configuration example of a bit field according to operation example 1 (option 2-1) is shown.

[0183] The bit field of the report content may be configured as follows.

[0184] Alt.1: Each bit field is mapped to a value pre-defined by the specification or set by RRC.

[0185] Alt.2: Each bit field is mapped to a range of values ​​predefined by the specification or set by RRC.

[0186] Alt.3: Each bit field is mapped to a multiple of the granularity pre-defined by the specification. Or set by RRC. For example, in the case where the report content is k, the parent node can interpret the value as k*granularity.

[0187] In addition, the value of the bit field may be represented by an absolute value or an offset value. Option 1 may be considered as a special case of Option 2. In Option 1, when the difference between the power of DL Parent BH and UL Access exceeds a threshold, "1" is set, and in other cases, "0" may be set.

[0188] In option 2, "1" is mapped to a certain range of values ​​(from a threshold value to a predetermined value), and "0'" can be mapped to another certain range of values ​​(from a predetermined value to a threshold value).

[0189] In addition, the application time may be the same as option 1-1. When there is no UL transmission or when it is not necessary to reduce the DL power, the report content may be set to any of the following.

[0190] Alt.1: Depends on installation

[0191] Alt.2: The content of the report is set to the value defined in advance by the specification

[0192] For example, in the case where the UL reception power of the IAB node is reported, if it is UL reception, the report content may be set to "0" defined in advance by the specification.

[0193] (3.2.2.4) Option 2-2

[0194] In this option, a series of reference values ​​are reported for each resource at each certain period. Fig.11 An example of resources to which the report according to Action Example 1 (option 2-2) is applied is shown.

[0195] The IAB node can report the reference value for DL ​​transmit power control of the parent node. In this option, the granularity of resources can also be set to time slot / symbol / symbol group.

[0196] The report content for each resource can be any of the following.

[0197] Alt.1: Same as option 2-1

[0198] Alt.2: Reporting of the initial resource Following option 2-1, for other resources, the offset values ​​from the initial value are reported.

[0199] The bit field indicating the offset value may be the same as Option 2-1. The time when the report is applied may be the same as Option 1-1. The IAB node may report on the resources in the period from n+k1 to n+k2.

[0200] In addition, regarding the resource type to be reported, it may be the same as option 1-1. For example, the IAB node may report a reference value of each MT DL resource.

[0201] (3.2.2.5) Option 3

[0202] This option is a combination of option 1 and option 2. Specifically, the following combination can be applied.

[0203] Option 3-1: A combination of options 1-1 and 2-1

[0204] The IAB node reports whether or not DL transmission power reduction is necessary and a reference (power) for DL ​​transmission power control.

[0205] Option 3-2: A combination of options 1-1 and 2-2

[0206] The IAB node reports whether or not DL transmission power reduction is necessary and a DL transmission power control reference (power) for each resource.

[0207] Option 3-3: A combination of options 1-2 and 2-1

[0208] The IAB node reports whether or not DL transmission power reduction is necessary for each resource, and a reference (power) for DL ​​transmission power control is applied to all resources.

[0209] Option 3-4: A combination of options 1-2 and 2-2

[0210] The IAB node reports whether or not DL transmission power reduction is necessary for each resource, and a reference (power) for DL ​​transmission power control is applied to all resources.

[0211] In addition, in the above combination, the contents of option 1 and option 2 may be reported separately or together.

[0212] (3.2.3) Action Example 2

[0213] In this operation example, several options can be set as described above regarding the reporting method of DL transmission power control. Each option will be described in more detail below.

[0214] (3.2.3.1) Option 1-1

[0215] Periodic, semi-persistent or non-periodic reporting via UCI may be based on the Channel State Information (CSI) framework. New CSI reporting content may be introduced.

[0216] (3.2.3.2) Option 1-2

[0217] The IAB node implements periodic, semi-persistent or aperiodic reporting based on MAC CE and higher layer signaling. Specifically, the reporting may be as follows.

[0218] In case of periodic reporting, the parent node sets the reporting period and offset value in RRC.

[0219] In case of semi-persistent reporting, the parent node sets the reporting period and offset value in RRC. In addition, the reporting can be activated through MAC CE or DCI.

[0220] In case of non-periodic reporting, the parent node sets the offset value in the RRC. The report can be triggered by MAC CE or DCI.

[0221] The resources for reporting can be determined by configuration via RRC or specification by the parent node using DCI, and when there are no available resources, the UE 200 can request it.

[0222] (3.2.3.3) Option 2

[0223] In this option, the report is triggered by the IAB node. Specifically, the IAB node may trigger the report according to at least any one of the following events.

[0224] Alt.1: The difference between the DL received power and the UL received power is greater than a threshold value predefined by the specification or set by RRC.

[0225] Alt.2: The DL received power is greater than the threshold value pre-defined by the specification or set by RRC.

[0226] Alt.3: The UL received power is lower than the threshold value pre-defined by the specification or set by RRC.

[0227] Alt.4: The performance (UL received block error rate (BLER) etc.) is lower than the threshold value predefined by the specification or set by RRC.

[0228] The report may be sent via UCI, MAC CE or higher layer signaling. Alternatively, the resources for reporting may be determined by setting via RRC or by specifying by the parent node using DCI, and may be requested by UE 200 if there are no available resources. For example, resources for periodic reporting may be reserved and set by the parent node.

[0229] (3.2.4) Action Example 3

[0230] Regarding the control of DL transmission power in the parent node and the IAB node, the parent node and the IAB node may operate as follows.

[0231] (3.2.4.1) Option 1

[0232] In (Option 1) of (Action Example 1) (reporting whether DL transmission power needs to be reduced) and there is no report on whether DL transmission power control needs to be performed, the parent node and the IAB node can perform operations according to any of the following options.

[0233] Alt.1: DL transmit power may be installation dependent. In this case, the IAB node may not expect a reduction in DL transmit power.

[0234] Alt.2: The parent node reduces the DL transmission power, and the IAB node expects a reduction in the DL transmission power of resources overlapping with DU resources having any of the following resource types.

[0235] DU-hard-UL / DU-hard-F

[0236] DU-soft-UL / DU-soft-F / DU-soft-UL indicated as IA

[0237] In case of supporting reporting of the link direction of DU-F, DU-hard-F / DU-soft-F / DU-soft-F reported as IA may be reported as UL.

[0238] On the other hand, in (Option 1) of (Action Example 1) (reporting whether DL transmit power needs to be reduced) and when there is a report on whether DL transmit power control needs to be performed, the parent node and the IAB node can act according to any of the following options.

[0239] Alt.1: DL transmit power depends on the installation.

[0240] Alt.2: The parent node reduces the DL transmission power, and the IAB node expects a reduction in the DL transmission power for the resources reported by the IAB node as requiring power reduction.

[0241] Alt.3: When the report includes inapplicable resources, the parent node reduces the DL transmission power, and the IAB node expects a reduction in the DL transmission power for the resources reported by the IAB node as requiring power reduction.

[0242] The type of applicable resources may be the same as (option 1) in (action example 1), for example, it may be a DU UL resource overlapping with an MT-DL resource.

[0243] On the other hand, for unused resources, the following actions can be taken.

[0244] Alt.3-1: The parent node ignores reports for resources that are not applied, and only applies the contents of reports for resources that can be applied.

[0245] Alt.3-2: The parent node expects a report that no power reduction is required.

[0246] Fig. 12A and Fig. 12B An example of a resource to which the report involved in Action Example 3 (Option 1) is applied is shown. Specifically, Fig. 12A Corresponding to Alt.2, Fig. 12B Corresponding to Alt.3-1.

[0247] For example, "1" may indicate that the DL transmission power needs to be reduced. In addition, the parent node may reduce the DL transmission power for the resources in the shaded portion in the figure.

[0248] In addition, in the case of Alt.3-2, the report can be regarded as an error case. In the case where the report content can only be applied to the MT resources that overlap with DU-UL, Fig. 12A The report content (the shaded part) can be set to "0,1,0" (in this case, "0" indicates an error).

[0249] (3.2.4.2) Option 2

[0250] In (Option 2) (reporting the value related to DL transmit power control) of (Action Example 1), when there is no report on whether DL transmit power control is required, the parent node and the IAB node can act according to any of the following options.

[0251] Alt.1: DL transmission power may vary depending on the installation. IAB nodes do not expect a reduction in DL transmission power.

[0252] Alt.2: The parent node reduces the DL transmission power. The IAB node expects a reduction in the DL transmission power of resources that overlap with DU resources having at least one of the following resource types, assuming the worst case of power imbalance. For example, when the UL reception power is reported by the parent node, it is assumed that the UL reception power is the minimum value that the IAB node can report.

[0253] DU-hard-UL / DU-hard-F

[0254] DU-soft-UL / DU-soft-F / DU-soft-UL indicated as IA

[0255] In case of supporting reporting of the link direction of DU-F, DU-hard-F / DU-soft-F / DU-soft-F reported as IA may be reported as UL.

[0256] On the other hand, in (option 2) of (action example 1) (report whether DL transmission power needs to be reduced) and whether DL transmission power control needs to be performed, the parent node and the IAB node can act according to any of the following options.

[0257] Alt.1: DL transmit power may depend on the installation.

[0258] Alt.2: The parent node reduces the DL transmission power, and the IAB node expects a reduction in the DL transmission power when the report corresponds to a rule defined in advance. For example, the parent node and the IAB node may operate as follows.

[0259] The parent node reduces the DL transmission power when the UL reception power is reported and the reported UL reception power is less than a threshold.

[0260] The parent node reduces the DL transmission power when the difference between the DL reception power and the UL reception power is reported and the reported difference exceeds a threshold.

[0261] The parent node follows the power reported by the IAB node when the expected DL transmit power / DL receive power or a reduction in the expected DL transmit power / DL receive power is reported.

[0262] Alt.3: When the report includes inapplicable resources, the parent node reduces the DL transmission power, and when the report corresponds to a predefined rule and the resources are applicable, the IAB node expects a reduction in the DL transmission power of the resources.

[0263] The type of applicable resources may be the same as (option 1) of (action example 1), for example, it may be a DU UL resource that overlaps with an MT-DL resource.

[0264] On the other hand, regarding unused resources, the following actions can be performed.

[0265] Alt.3-1: The parent node ignores reports for resources that are not applicable, and applies the contents of the reports only to resources that can be applied.

[0266] Alt.3-2: The parent node expects a report of a value that is predefined by the specification.

[0267] Fig.13A and Fig. 13B An example of a resource to which the report involved in Action Example 3 (Option 2) is applied is shown. Specifically, Fig.13A Corresponding to Alt.2, Fig. 13B Corresponding to Alt.3-1.

[0268] For example, the IAB node may report the UL received power of all MT-DL resources. If the threshold is set to 15, the reported content may be set to "10, 10, 10" and so on.

[0269] In addition, in the case of Alt.3-2, the report can be regarded as an error case. In the case where the report content can only be applied to the MT resources that overlap with DU-UL, Fig. 12A The report content (the shaded part) can be set to "0,10,0" (in this case, "0" indicates an error).

[0270] (4) Action and Effect

[0271] According to the above-mentioned embodiment, the following effects can be obtained. Specifically, according to the IAB node (wireless communication node 100B), the power control information used for DL ​​transmission power control in the parent node (upper node) can be reported to the parent node. Therefore, the parent node can reduce the DL transmission power as needed based on the power control information. In this way, the power imbalance between the wireless communication nodes constituting the IAB can be suppressed.

[0272] As a result, in IAB, even when the MT and the DU operate simultaneously, the wireless communication nodes can each normally receive a wireless signal.

[0273] In this embodiment, the IAB node can report power control information indicating whether DL transmission power control is required in the parent node. Therefore, the parent node can reliably reduce DL transmission power when necessary.

[0274] In this embodiment, the IAB node can report power control information indicating numerical values ​​(such as UL received power values) related to DL transmission power control in the parent node. Therefore, the parent node can implement more appropriate DL transmission power control based on the numerical values.

[0275] In this embodiment, the IAB node can report the power control information according to the instruction from the parent node, so that the DL transmission power control can be realized at the appropriate timing when the transmission power control is required.

[0276] In this embodiment, the power control information may include information specifying resources constituting the object of the transmission power control. Therefore, more detailed DL transmission power control can be realized in the parent node.

[0277] (5) Other Implementation Methods

[0278] Although the embodiment has been described above, it is obvious to those skilled in the art that the present invention is not limited to the description of the embodiment, and various modifications and improvements can be made.

[0279] For example, in the above-mentioned embodiments, names such as parent node, IAB node, and child node are used, but as long as the structure of the wireless communication node obtained by integrating the wireless backhaul between wireless communication nodes such as gNB and the wireless access with the terminal is adopted, the name can be different. For example, it can be simply called the first node, the second node, etc., or it can be called an upper node, a lower node, or a relay node, an intermediate node, etc.

[0280] In addition, a wireless communication node may be simply referred to as a communication device or a communication node, and may also be replaced by a wireless base station.

[0281] In the above-mentioned embodiments, the terms downlink (DL) and uplink (UL) are used, but other terms may be used to refer to the downlink. For example, the terms forward link, reverse link, access link, backhaul, etc. may be substituted or associated. Alternatively, the terms first link, second link, first direction, second direction, etc. may be simply used.

[0282] The block diagram used in the description of the above embodiment ( Figure 3 , 4) shows blocks in units of functions. These functional blocks (structural parts) are implemented by any combination of at least one of hardware and software. In addition, there is no particular limitation on the implementation method of each functional block. That is, each functional block can be implemented using a device that is physically or logically combined, or two or more physically or logically separated devices can be directly or indirectly connected (for example, using wires, wirelessly, etc.) and implemented using these multiple devices. The functional block can also be implemented by combining software with the above-mentioned one device or the above-mentioned multiple devices.

[0283] Functionally, it includes judging, deciding, determining, calculating, calculating, processing, deriving, investigating, searching, confirming, receiving, sending, outputting, accessing, solving, selecting, selecting, establishing, comparing, assuming, expecting, regarding, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc., but is not limited to these. For example, the functional block (structural part) that enables the sending function is called a transmitting unit or a transmitter. In short, as mentioned above, there is no particular limitation on the implementation method.

[0284] Furthermore, the above-mentioned CU 50 , wireless communication nodes 100A to 100C, and UE 200 (the device) may also function as a computer that performs the processing of the wireless communication method of the present disclosure. Fig.14 FIG. 1 is a diagram showing an example of the hardware structure of the device. Fig.14 As shown, the device may also be configured as a computer device including a processor 1001, a memory 1002 (memory), a storage 1003 (storage), a communication device 1004, an input device 1005, an output device 1006, and a bus 1007.

[0285] In the following description, the word "device" may be replaced by "circuit", "device", "unit", etc. The hardware structure of the device may include one or more of the devices shown in the figure, or may exclude some of the devices.

[0286] Each functional block of the device ( Figure 3 , 4 ) can be implemented by any hardware element or combination of hardware elements of the computer device.

[0287] In addition, each function in the device is implemented by the following method: predetermined software (program) is read into hardware such as processor 1001 and memory 1002, so that processor 1001 performs calculations and controls the communication of communication device 1004 or controls at least one of the reading and writing of data in memory 1002 and storage 1003.

[0288] The processor 1001 controls the entire computer by, for example, running an operating system. The processor 1001 may be constituted by a central processing unit (CPU) including an interface with peripheral devices, a control device, a calculation device, a register, and the like.

[0289] In addition, the processor 1001 reads a program (program code), a software module or data, etc. from at least one of the memory 1003 and the communication device 1004 to the memory 1002, and performs various processes accordingly. As a program, a program that causes a computer to perform at least a part of the actions described in the above-mentioned embodiments is used. In addition, with respect to the above-mentioned various processes, although it is described that the above-mentioned various processes are performed by one processor 1001, the above-mentioned various processes can also be performed simultaneously or sequentially by more than two processors 1001. The processor 1001 can also be installed by more than one chip. In addition, the program can also be sent from the network via a telecommunication line.

[0290] The memory 1002 is a computer-readable recording medium, and may be composed of 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 referred to as a register, a cache, a main memory (main storage device), etc. The memory 1002 may store a program (program code), a software module, etc. that can execute a method according to an embodiment of the present disclosure.

[0291] The memory 1003 is a computer-readable recording medium, and may be composed of at least one of an optical disk such as a CD-ROM (Compact Disc ROM), a hard disk drive, a floppy disk, a magneto-optical disk (e.g., a compressed disk, a digital versatile disk, a Blu-ray (registered trademark) disk, a smart card, a flash memory (e.g., a card, a stick, a key drive), a Floppy (registered trademark) disk, a magnetic strip, etc. The memory 1003 may also be referred to as an auxiliary storage device. The above-mentioned recording medium may be, for example, other appropriate media such as a database, a server, etc. that includes at least one of the memory 1002 and the memory 1003.

[0292] The communication device 1004 is hardware (transceiver) used to communicate between computers via at least one of a wired network and a wireless network, and may also be called a network device, a network controller, a network card, a communication module, etc.

[0293] The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc., for example, in order to realize at least one of frequency division duplex (FDD) and time division duplex (TDD).

[0294] The input device 1005 is an input device that receives input from the outside (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.). The output device 1006 is an output device that implements output to the outside (e.g., a display, a speaker, an LED light, etc.). In addition, the input device 1005 and the output device 1006 may also be integrally formed (e.g., a touch panel).

[0295] In addition, the processor 1001 and the memory 1002 and other devices are connected via a bus 1007 for communicating information. The bus 1007 may be configured using a single bus or may be configured using different buses for each device.

[0296] In addition, 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), a field programmable gate array (FPGA), etc., and a part or all of each functional block may be implemented by the hardware. For example, the processor 1001 may also be installed using at least one of these hardware.

[0297] In addition, the notification of information is not limited to the form / implementation method described in the present disclosure, and other methods may also be used. For example, the notification of information may be implemented through physical layer signaling (e.g., downlink control information (Downlink Control Information: DCI), uplink control information (Uplink Control Information: UCI)), high-level signaling (e.g., RRC signaling, medium access control (Medium Access Control: MAC) signaling, broadcast information (Master Information Block: MIB, System Information Block: SIB)), other signals or a combination thereof. In addition, RRC signaling may also be referred to as an RRC message, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, etc.

[0298] The various forms / implementations described in the present disclosure may also be applied to Long Term Evolution (LTE), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, fourth generation mobile communication systems (4 th generation mobile communication system:4G), fifth generation mobile communication system (5 thAt least one of the following: future generation mobile communication system: 5G), future radio access (Future Radio Access: FRA), new radio (New Radio: NR), W-CDMA (registered trademark), GSM (registered trademark), CDMA 2000, Ultra Mobile Broadband (Ultra Mobile Broadband: UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, UWB (Ultra-WideBand), Bluetooth (registered trademark), a system using other appropriate systems, and a next generation system expanded therefrom. In addition, a combination of multiple systems (for example, a combination of at least one of LTE and LTE-A with 5G, etc.) may be used.

[0299] The processing procedures, timings, processes, etc. of each form / implementation described in this disclosure may be changed in order without contradiction. For example, for the method described in this disclosure, the elements of various steps are presented in an illustrative order, but are not limited to the specific order presented.

[0300] In the present disclosure, specific actions performed by a base station are sometimes performed by its upper node depending on the situation. In a network consisting of one or more network nodes having a base station, various actions performed to communicate with a terminal can be performed by at least one of the base station and other network nodes other than the base station (for example, consider MME or S-GW, etc., but not limited to these). In the above, the case where there is one other network node other than the base station is illustrated, but the other network node may also be a combination of multiple other network nodes (for example, MME and S-GW).

[0301] Information, signals (information, etc.) can be output from a higher layer (or lower layer) to a lower layer (or higher layer), and can also be input or output via multiple network nodes.

[0302] The input or output information can be stored in a specific location (e.g., memory) or managed using a management table. The input or output information can be rewritten, updated, or appended. The output information can also be deleted. The input information can also be sent to other devices.

[0303] The determination may be made by a value represented by one bit (0 or 1), by a Boolean value (Boolean: true or false), or by comparison of numerical values ​​(for example, comparison with a predetermined value).

[0304] Each form / implementation described in the present disclosure may be used alone or in combination, and may be switched according to execution. In addition, notification of scheduled information is not limited to being performed explicitly (e.g., notification of "yes X"), but may also be performed implicitly (e.g., not notifying the scheduled information).

[0305] Software, whether referred to as software, firmware, middleware, microcode, hardware description language, or by other names, shall be interpreted broadly to refer to commands, sets of commands, codes, code segments, program codes, programs, subroutines, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, etc.

[0306] In addition, software, commands, information, etc. may be sent and received via a transmission medium. For example, when software is sent from a web page, server, or other remote source using at least one of wired technology (coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), etc.) and wireless technology (infrared, microwave, etc.), at least one of these wired technology and wireless technology is included in the definition of transmission medium.

[0307] The information, signals, etc. described in the present disclosure may also be represented by any of a variety of different technologies. For example, data, commands, instructions, information, signals, bits, symbols, chips, etc. that may be involved in the above description as a whole may be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any combination thereof.

[0308] In addition, the terms described in the present disclosure and the terms required 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 also be a signal (signaling). In addition, a signal may also be a message. In addition, a component carrier (CC) may be referred to as a carrier frequency, a cell, a frequency carrier, etc.

[0309] The terms "system" and "network" used in this disclosure may be used interchangeably.

[0310] In addition, the information, parameters, etc. described in the present disclosure may be represented by absolute values, relative values ​​to predetermined values, or other corresponding information. For example, wireless resources may also be indicated by indexes.

[0311] The names used for the above parameters are not limiting in any way. Furthermore, the formulas etc. using these parameters may sometimes differ from those explicitly stated in this disclosure. Various channels (e.g., PUCCH, PDCCH, etc.) and information elements may be identified by appropriate names, and therefore the various names assigned to these various channels and information elements are not limiting in any way.

[0312] In the present disclosure, the terms "base station (BS)", "wireless base station", "fixed station", "NodeB", "eNodeB (eNB)", "gNodeB (gNB)", "access point", "transmission point", "reception point", "transmission / reception point", "cell", "sector", "cell group", "carrier", "component carrier" and the like are used interchangeably. Sometimes, a base station is also referred to as a macro cell, a small cell, a micro cell, a pico cell, etc.

[0313] A base station can accommodate one or more (for example, 3) cells. 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 also provide communication services through a base station subsystem (for example, a small base station for indoor use (Remote Radio Head (RRH))).

[0314] The terms "cell" or "sector" refer to a part or the entirety of a coverage area of ​​at least one of a base station and a base station subsystem that provide communication services within the coverage area.

[0315] In the present disclosure, terms such as “mobile station (MS)”, “user terminal (user terminal)”, “user equipment (UE)”, and “terminal” may be used interchangeably.

[0316] For mobile stations, those skilled in the art sometimes also use the following terms: subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other appropriate terms.

[0317] At least one of the base station and the mobile station may also be referred to as a transmitting device, a receiving device, a communication device, etc. In addition, at least one of the base station and the mobile station may be a device mounted on a mobile body, the mobile body itself, etc. The mobile body may be a means of transportation (e.g., a car, an airplane, etc.), a mobile body that moves in an unmanned manner (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). In addition, at least one of the base station and the mobile station also includes a device that does not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

[0318] In addition, the base station in the present disclosure may also be replaced by a mobile station (user terminal, the same below). For example, various forms / implementations of the present disclosure may also be applied to a structure in which the communication between a base station and a mobile station is replaced by the communication between multiple mobile stations (for example, may also be referred to as device-to-device (Device-to-Device: D2D), vehicle-to-everything (Vehicle-to-Everything: V2X), etc. In this case, it may also be configured that the mobile station has the functions of the base station. In addition, terms such as "uplink" and "downlink" may also be replaced by terms corresponding to communication between terminals (for example, "side"). For example, an uplink channel, a downlink channel, etc. may also be replaced by a side channel.

[0319] Likewise, the mobile station in the present disclosure may be replaced by a base station. In this case, the base station may have the same functions as the mobile station.

[0320] A radio frame may be composed of one or more frames in the time domain. One or more frames in the time domain may also be referred to as subframes. A subframe may also be composed of one or more time slots in the time domain. A subframe may be a fixed time length (e.g., 1 ms) that is independent of a parameter set (numerology).

[0321] A parameter set may also be a communication parameter applied to at least one of the transmission and reception of a certain signal or channel. The parameter set may, for example, represent at least one of a subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), the number of symbols per TTI, a wireless frame structure, a specific filtering process performed by a transceiver in the frequency domain, a specific windowing process performed by a transceiver in the time domain, and the like.

[0322] A time slot may be composed of one or more symbols (Orthogonal Frequency Division Multiplexing (OFDM) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, etc.) in the time domain. A time slot may be a time unit based on a parameter set.

[0323] A time slot may also include multiple mini-slots. Each mini-slot may be composed of one or more symbols in the time domain. In addition, a mini-slot may also be referred to as a sub-slot. A mini-slot may also be composed of fewer symbols than a time slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a mini-slot may also be referred to as a PDSCH (or PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot may also be referred to as a PDSCH (or PUSCH) mapping type B.

[0324] Radio frames, subframes, time slots, mini-time slots, and symbols all represent time units for transmitting signals. Radio frames, subframes, time slots, mini-time slots, and symbols may also be referred to by other corresponding names.

[0325] For example, 1 subframe may also be referred to as a transmission time interval (TTI), multiple consecutive subframes may also be referred to as a TTI, and 1 time slot or 1 mini time slot may also be referred to as a TTI. That is, at least one of the subframe and the TTI may be a subframe (1ms) in the existing LTE, or a period shorter than 1ms (for example, 1-13 symbols), or a period longer than 1ms. In addition, the unit representing the TTI may not be a subframe, but may be referred to as a time slot, a mini time slot, or the like.

[0326] Here, TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in the LTE system, the base station schedules each user terminal to allocate wireless resources (frequency bandwidth, transmission power, etc. that can be used in each user terminal) in units of TTI. In addition, the definition of TTI is not limited to this.

[0327] TTI can be a transmission time unit of data packets (transport blocks), code blocks, code words, etc. after channel coding, or a processing unit for scheduling, link adaptation, etc. In addition, when a TTI is assigned, the time interval (for example, the number of symbols) to which a transport block, code block, code word, etc. is actually mapped can also be shorter than the TTI.

[0328] In addition, when 1 time slot or 1 mini time slot is called TTI, more than one TTI (i.e., more than one time slot or more than one mini time slot) can also constitute the minimum time unit of scheduling. In addition, the number of time slots (mini time slots) constituting the minimum time unit of scheduling can also be controlled.

[0329] A TTI having a time length of 1 ms may be referred to as a normal TTI (TTI in LTE Rel.8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, a long subframe, a time slot, etc. A TTI shorter than a normal TTI may be referred to as a shortened TTI, a short TTI, a partial TTI (partial or fractional TTI), a shortened subframe, a short subframe, a mini time slot, a sub time slot, a time slot, etc.

[0330] In addition, long TTI (e.g., normal TTI, subframe, etc.) can be replaced by TTI with a time length exceeding 1ms, and short TTI (e.g., shortened TTI, etc.) can also be replaced by TTI with a TTI length smaller than that of long TTI and greater than 1ms.

[0331] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain. In the frequency domain, it may also include one or more consecutive subcarriers. The number of subcarriers included in an RB may be the same regardless of the parameter set, for example, it may be 12. The number of subcarriers included in an RB may be determined based on the parameter set.

[0332] In addition, the time domain of an RB may include one or more symbols, and may be of the length of 1 slot, 1 mini slot, 1 subframe, or 1 TTI. 1 TTI, 1 subframe, etc. may also be composed of one or more resource blocks.

[0333] In addition, one or more RBs may also be referred to as a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, and the like.

[0334] In addition, a resource block may be composed of one or more resource elements (RE). For example, 1 RE may be a radio resource region of 1 subcarrier and 1 symbol.

[0335] A bandwidth part (BWP) (also called partial bandwidth, etc.) may also represent a subset of continuous common RBs (common resource blocks) for a parameter set in a certain carrier. Here, the common RBs may also be determined by the index of the RB based on the common reference point of the carrier. PRBs may also be defined by a BWP and numbered within the BWP.

[0336] The BWP may include a BWP for UL (UL BWP) and a BWP for DL ​​(DL BWP). For a UE, one or more BWPs may be configured within one carrier.

[0337] At least one of the configured BWPs may be activated, and the UE may not assume that it transmits or receives predetermined signals / channels other than the activated BWP. In addition, "cell", "carrier", etc. in the present disclosure may also be replaced by "BWP".

[0338] The above structures of radio frames, subframes, time slots, mini-time slots, and symbols are merely examples. For example, the number of subframes included in a radio frame, the number of time slots in each subframe or radio frame, the number of mini-time slots included in a time slot, the number of symbols and RBs included in a time slot or mini-time slot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the cyclic prefix (CP) length, and the like can be variously changed.

[0339] The terms "connected", "coupled" or all variations of these terms are intended to indicate any direct or indirect connection or combination between two or more elements, and may include the situation where there is one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The combination or connection between elements may be a physical combination or connection, a logical combination or connection, or a combination of these. For example, "access" may be used to replace "connection". In the context of the present disclosure, for two elements, it may be considered that they are "connected" or "coupled" to each other by using at least one of one or more wires, cables, and printed electrical connections, and as some non-limiting and non-inclusive examples, by using electromagnetic energy such as electromagnetic energy with wavelengths in the wireless frequency domain, microwave region, and light (including both visible and invisible) region.

[0340] The reference signal may be referred to as Reference Signal (RS) for short, or may be referred to as a pilot signal depending on the applied standard.

[0341] The phrase "according to" used in the present disclosure does not mean "only according to" unless otherwise expressly stated. In other words, the phrase "according to" means both "only according to" and "at least according to".

[0342] The “unit” in the configuration of each of the above-mentioned devices may be replaced with a “section”, “circuit”, “device” or the like.

[0343] Any reference to an element using the terms "first", "second", etc. used in this disclosure does not necessarily limit the number and order of these elements. These terms are used in this disclosure as a simple method to distinguish between two or more elements. Therefore, a reference to a first and a second element does not mean that only two elements can be used here or that the first element must precede the second element in any form.

[0344] When the terms "include," "including," and variations thereof are used in the present disclosure, these terms are intended to be inclusive, as is the term "comprising." Furthermore, the term "or" used in the present disclosure does not mean an exclusive or.

[0345] In the present disclosure, when an article is added by translation, such as a, an, and the in English, for example, the present disclosure also includes the case where the noun following the article is in plural form.

[0346] The terms "determining" and "determining" used in the present disclosure sometimes also include situations of various actions. "Judgment" and "determination" may, for example, include situations where matters that have been judged, calculated, calculated, processed, derived, investigated, searched (for example, searched in a table, database or other data structure), confirmed (ascertaining) are considered to be "judged" or "determined". In addition, "judgment" and "determination" may include situations where matters that have been received (for example, receiving information), transmitted (for example, transmitting information), input, output, accessed (for example, accessed data in memory) are considered to be "judged" or "determined". In addition, "judgment" and "determination" may include situations where matters that have been resolved (resolving), selected (selecting), chosen (choosing), established (establishing), compared (comparing), etc. are considered to be "judged" or "determined". That is, "judgment" and "decision" can include "judgment" and "decision" of any action. In addition, "judgment (decision)" can be replaced by "assuming (assuming)", "expecting (expecting)", "considering (considering)".

[0347] In the present disclosure, the phrase "A and B are different" may also mean "A and B are different from each other". In addition, the phrase may also mean "A and B are different from C, respectively". The phrases such as "separate" and "combine" may also be interpreted as "different".

[0348] The present disclosure has been described in detail above, but it should be 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 can be implemented as a modification and alteration without departing from the subject matter and scope of the present disclosure as determined by the claims. Therefore, the purpose of the description of the present disclosure is to illustrate and not to have any limiting meaning on the present disclosure.

[0349] Description of labels:

[0350] 10 Wireless Communication Systems

[0351] 50 CU

[0352] 100A, 100B, 100C Wireless Communication Node

[0353] 110 Wireless Transmission Unit

[0354] 120 Wireless receiving unit

[0355] 130 NW IF Department

[0356] 140 Power control information receiving unit

[0357] 150 Control Department

[0358] 161 Wireless Transmission Unit

[0359] 162 Wireless receiving unit

[0360] 170 Control Department

[0361] 180 Power control information sending unit

[0362] UE 200

[0363] 1001 Processor

[0364] 1002 Memory

[0365] 1003 Memory

[0366] 1004 Communication devices

[0367] 1005 Input Device

[0368] 1006 Output Device

[0369] 1007 Bus

Claims

1. A wireless communication node having a function of connecting to an upper wireless communication node that acts as a parent node relative to the wireless communication node, namely a mobile terminal MT, and a function of connecting to a lower wireless communication node that acts as a child node relative to the wireless communication node, namely a distribution unit DU, wherein: The wireless communication node has: a receiving unit configured to receive a downlink signal from the upper wireless communication node; and a transmitting unit configured to transmit a medium access control element (MAC CE) including a value for controlling the transmission power of the downlink signal to the upper wireless communication node, The MAC CE includes information specifying resources associated with the MT and the DU that are the objects of control of the transmission power.

2. The wireless communication node according to claim 1, wherein The value for controlling the transmission power is an offset value of the downlink signal with respect to a reference power.

3. The wireless communication node according to claim 2, wherein: The reference power is set by the radio resource control layer.

4. A wireless communication method, which is a wireless communication method in a wireless communication node, the wireless communication node having a function for connecting to an upper wireless communication node that acts as a parent node relative to the wireless communication node, namely a mobile terminal MT, and a function for connecting to a lower wireless communication node that acts as a child node relative to the wireless communication node, namely a distribution unit DU, wherein: receiving a downlink signal from the upper wireless communication node, sending a medium access control element (MAC CE) including a value for controlling the transmission power of the downlink signal to the upper wireless communication node, The MAC CE includes information specifying resources associated with the MT and the DU that are the objects of control of the transmission power.

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