Wireless communication node and wireless communication method

Abstract

This wireless communication node comprises: a reception unit that receives downlink control information for specifying a frequency resource available in a frequency direction, the frequency resource serving as a wireless resource which is allocated to a wireless link established with a lower node; and a control unit that, on the basis of the downlink control information, dynamically controls communication carried out via the wireless link.

Description

Technical Field

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

Background Art

[0002] The 3rd Generation Partnership Project (3GPP) is standardizing the 5th generation mobile communication system (also called 5G, New Radio (NR) or Next Generation (NG)), and is also proceeding with the standardization of the next generation called Beyond 5G, 5G Evolution or 6G.

[0003] For example, in the radio access network (RAN) of NR, Integrated Access and Backhaul (IAB) is defined, which integrates wireless access to a terminal (User Equipment, UE) and a wireless backhaul between wireless communication nodes such as a gNB (see Non-Patent Document 1).

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

[0005] Also, in IAB, simultaneous transmission and reception using time division duplexing (TDD) or the like is supported in the wireless link between the parent node and the IAB node (Link_parent) and the wireless link between the IAB node and the child node (Link_child).

Prior Art Documents

Non-Patent Documents

[0006]

Non-Patent Document 1

Summary of the Invention

[0007] By the way, in IAB, in Link_parent (i.e., DU) and Link_child (i.e., MT), not only TDD but also frequency division duplexing (FDD) is being considered, and static resource allocation in TDD and FDD is also being considered. Furthermore, for TDD, dynamic allocation of time resources in the time direction available as DU resources is also being considered using downlink control information (DCI).

[0008] Under such circumstances, as a result of intensive studies, the inventors have found the necessity for dynamic allocation of not only time resources available in the time direction but also frequency resources available in the frequency direction.

[0009] Therefore, the following disclosure has been made in view of such a situation, and an object thereof is to provide a wireless communication node and a wireless communication method that can dynamically use frequency resources in the frequency direction available as DU resources.

[0010] One aspect of the present disclosure is a wireless communication node, comprising: a receiving unit that receives downlink control information specifying frequency resources available in the frequency direction as wireless resources to be allocated to a wireless link with a lower node; and a control unit that dynamically controls communication using the wireless link based on the downlink control information.

[0011] One aspect of the present disclosure is a wireless communication method, which includes receiving downlink control information that specifies frequency resources available in the frequency direction as wireless resources to be allocated to a wireless link with a lower node, and dynamically controlling communication using the wireless link based on the downlink control information.

Brief Description of Drawings

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DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, embodiments will be described with reference to the drawings. The same or similar reference numerals are assigned to the same functions and configurations, and the description thereof will be omitted as appropriate.

[0014] (1) Overall schematic configuration of the wireless communication system FIG. 1 is an overall schematic configuration diagram of a wireless communication system 10 according to this 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. Note that the wireless communication system 10 may also be a wireless communication system according to a system called Beyond 5G, 5G Evolution, or 6G.

[0015] Specifically, the wireless communication system 10 includes a Next Generation-Radio Access Network 20 (hereinafter, NG-RAN 20), wireless communication nodes 100A, 100B, 100C, and a terminal 200 (hereinafter, UE 200, User Equipment).

[0016] The wireless communication nodes 100A, 100B, and 100C can each form a cell C1, cell C2, and cell C3. The wireless communication nodes 100A, 100B, and 100C can set up a wireless access link with the UE200 and a wireless backhaul link between the wireless communication nodes via the cell. Specifically, a backhaul (transmission path) using a wireless link may be set up between the wireless communication node 100A and the wireless communication node 100B, and between the wireless communication node 100B and the wireless communication node 100C.

[0017] In this way, the configuration in which the wireless access to the UE200 and the wireless backhaul between the wireless communication nodes are integrated is called Integrated Access and Backhaul (IAB).

[0018] 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 the corresponding interfaces, for example, NR Uu (between MT and gNB / DU), F1, NG, X2, and N4 may be used as a baseline.

[0019] The wireless communication node 100A is connected to the NG-RAN20 and the core network (Next Generation Core (NGC) or 5GC) via a wired transmission path such as a fiber transport. Note that, including the NG-RAN and NGC, it may simply be expressed as the "network".

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

[0021] Note that the IAB donor may be called a higher-level node in relation to the IAB node. Furthermore, the IAB donor may be called a parent node. Also, the IAB donor has a CU, and the parent node is simply used as a name in relation to the IAB node (or child node) and may not have a CU. The IAB node may be called a lower-level node in relation to the IAB donor (parent node). Also, the child node may include the UE200.

[0022] A wireless link (Backhaul link) is set between the IAB donor and the IAB node. Specifically, a wireless link called Link_parent may be set. A wireless link (Backhaul link) is set between the IAB node and the child node. Specifically, a wireless link called Link_child may be set.

[0023] Link_parent may be composed of a downlink DL Parent BH and an uplink UL Parent BH. Link_child may be composed of a downlink DL Child BH and an uplink UL Child BH.

[0024] The IAB node has a Mobile Termination (IAB-MT), which is a function for connecting to the IAB donor, and a Distributed Unit (IAB-DU), which is a function for connecting to the child node (or UE200). The child node also has an MT and a DU. The IAB donor has a Central Unit (CU) and a DU.

[0025] From the perspective of the DU, the radio resources used by the DU are classified into one of the types of Downlink (DL), Uplink (UL), and Flexible time-resource (D / U / F), which are Hard, Soft, or Not Available (H / S / NA). Also, within Soft (S), available or not available is defined.

[0026] Flexible time-resource (F) is a radio resource (time resource and / or frequency resource) that can be used for either DL or UL. Also, "Hard" means that the corresponding time resource is always available for the DU Link_child connected to the child node or UE, and "Soft" means that the availability of the corresponding time resource for the DU Link_child is explicitly or implicitly controlled by the IAB donor (or parent node) (DU resource).

[0027] Furthermore, in the case of Soft (S), based on IA or INA, the radio resources to be notified can be determined.

[0028] "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 not available.

[0029] In the embodiment, the radio access and radio backhaul can be either half-duplex communication or full-duplex communication. Also, multiplexing methods such as time-division multiplexing (TDM), space-division multiplexing (SDM), and frequency-division multiplexing (FDM) can be used.

[0030] When the IAB node operates in half-duplex, the DL Parent BH is on the receiving (RX) side, the UL Parent BH is on the transmitting (TX) side, the DL Child BH is on the transmitting (TX) side, and the UL Child BH is on the receiving (RX) side. Also, in the case of Time Division Duplex (TDD), the DL / UL setting pattern in the IAB node is not limited to DL-F-UL only, and setting patterns such as only wireless backhaul (BH), UL-F-DL, etc. may be applied. In this embodiment, SDM / FDM is used to realize the simultaneous operation of the DU and MT of the IAB node.

[0031] (2) Functional Block Configuration of Wireless Communication System Next, the functional block configuration of the wireless communication system 10 will be described. Specifically, the functional block configurations of the wireless communication nodes 100A, 100B, and 100C that make up the IAB node will be described.

[0032] FIG. 3 is a functional block configuration diagram of the wireless communication node 100B (IAB node). Note that the wireless communication node 100A differs from the wireless communication node 100B that functions as an IAB node in that it functions as an IAB donor (parent node). Also, the wireless communication node 100C differs from the wireless communication node 100B in that it functions as a child node. Hereinafter, the case of the wireless communication node 100B will be described as an example.

[0033] As shown in FIG. 3, the wireless communication node 100B includes a wireless signal transceiver unit 110, an amplifier unit 120, a modulation / demodulation unit 130, a control signal processing unit 140, an encoding / decoding unit 150, and a control unit 170.

[0034] Note that in FIG. 5, only the main functional blocks related to the description of the embodiment are shown, and it should be noted that the wireless communication node 100B has other functional blocks (for example, a power supply unit, etc.). Also, FIG. 5 shows the functional block configuration of the wireless communication node 100B. For the hardware configuration, refer to FIG. 19.

[0035] The wireless signal transceiver unit 110 transmits and receives wireless signals according to NR. The wireless signal transceiver unit 110 can support Massive MIMO that generates a more directional beam by controlling the wireless (RF) signals transmitted from a plurality of antenna elements, carrier aggregation (CA) that bundles and uses a plurality of component carriers (CC), and dual connectivity (DC) that enables simultaneous communication between the UE and two NG-RAN Nodes respectively.

[0036] The wireless signal transceiver unit 110 can transmit and receive wireless signals with the wireless communication node 100A via cell C1. Also, the wireless signal transceiver unit 110 can transmit and receive wireless signals with the wireless communication node 100C or UE200 via cell C2.

[0037] The amplifier unit 120 is composed of a PA (Power Amplifier) / LNA (Low Noise Amplifier), etc. The amplifier unit 120 amplifies the signal output from the modulation / demodulation unit 130 to a predetermined power level. Also, the amplifier unit 120 amplifies the RF signal output from the wireless signal transceiver unit 110.

[0038] The modulation / demodulation unit 130 performs data modulation / demodulation, transmission power setting, resource block allocation, etc. for each specific communication destination (wireless communication nodes 100A, 100B, or UE200).

[0039] The control signal processing unit 140 performs processing related to various control signals transmitted and received by the wireless communication node 100B. Specifically, the control signal processing unit 140 receives various control signals transmitted via the control channel from the wireless communication node 100A (or wireless communication node 100C, the same hereinafter) and UE200, for example, the control signals of the radio resource control layer (RRC). Also, the control signal processing unit 140 transmits various control signals to the wireless communication node 100A or UE200 via the control channel.

[0040] Furthermore, the control signal processing unit 140 can execute processing using reference signals (RS) such as Demodulation Reference Signal (DMRS) and Phase Tracking Reference Signal (PTRS).

[0041] DMRS is a reference signal (pilot signal) known between the base station and the terminal specific to the terminal for estimating the fading channel used for data demodulation. PTRS is a reference signal specific to the terminal for the purpose of estimating phase noise that is a problem in a high frequency band.

[0042] In addition to DMRS and PTRS, the reference signal may include Channel State Information-Reference Signal (CSI-RS), Sounding Reference Signal (SRS), and Positioning Reference Signal (PRS) for position information.

[0043] The channel includes a control channel and a data channel. The control channel includes Physical Downlink Control Channel (PDCCH), Physical Uplink Control Channel (PUCCH), Physical Random Access Channel (PRACH), and Physical Broadcast Channel (PBCH).

[0044] In addition, the data channel includes Physical Downlink Shared Channel (PDSCH) and Physical Uplink Shared Channel (PUSCH). The signal may include a channel and a reference signal.

[0045] In an embodiment, the control signal processing unit 140 receives downlink control information (DCI) that specifies a frequency resource available in the frequency direction as a radio resource (DU resource) to be allocated to a radio link (Link_child) with a lower node (for example, the wireless communication node 100C). The information element that specifies the frequency resource available in the frequency direction can be an information element (IA (Indication Available)) indicating that it is available as a DU resource in Soft (S), or an information element (INA (Indication Not-Available)) indicating that it is not available as a DU resource in Soft (S). The control signal processing unit 140 may receive DCI from an IAB donor (parent node). For example, the control signal processing unit 140 may receive DCI from the wireless communication node 100A.

[0046] Such DCI may be newly defined DCI or DCI obtained by extending existing DCI. The existing DCI may be DCI that specifies a time resource available in the time direction as a radio resource (DU resource). The DCI that specifies the time resource available in the time direction may be DCI having the format of DCI format 2_5 (see Section 7.3 of 3GPP TS38.212).

[0047] The DU resource may be defined by a unit in the time direction (for example, a symbol or a slot) and a unit in the frequency direction (for example, a subcarrier).

[0048] The encoding / decoding unit 150 performs data splitting / concatenation, channel coding / decoding, etc. for each predetermined communication destination (the wireless communication node 100A or the UE 200).

[0049] Specifically, the encoding / decoding unit 150 divides the data output from the data transmission / reception unit 160 into a predetermined size and performs channel coding on the divided data. Further, the encoding / decoding unit 150 decodes the data output from the modulation / demodulation unit 130 and concatenates the decoded data.

[0050] The data transmission / reception unit 160 performs the transmission and reception of Protocol Data Unit (PDU) and Service Data Unit (SDU). Specifically, the data transmission / reception unit 160 performs operations such as the assembly / disassembly of PDU / SDU in a plurality of layers (such as the Medium Access Control layer (MAC), the Radio Link Control layer (RLC), and the Packet Data Convergence Protocol layer (PDCP)).

[0051] The control unit 170 controls each functional block constituting the wireless communication node 100B. In particular, in this embodiment, the control unit 170 performs control related to the simultaneous transmission and reception between the IAB-MT and the IAB-DU.

[0052] In the embodiment, the control unit 170 dynamically controls the communication using the radio link (Link_child) based on the DCI. For example, the control unit 170 performs communication using the radio link (Link_child) using the frequency resources specified as available by the DCI.

[0053] (3) Quasi-static DU resources Below, the settings regarding the types (Hard, Soft, NA) of quasi-static (Semi-static) DU resources will be described.

[0054] As shown in FIG. 4, the type of DU resource in the time direction and the type of DU resource in the frequency direction may be set separately. In such a case, the type of DU resource specified by the Hard-Hard combination may be Hard. The type of DU resource specified by the Hard-Soft or Soft-Soft combination may be Soft. The type of DU resource specified by the Hard-NA, Soft-NA or NA-NA combination may be NA. Note that the information element for setting the type of DU resource in the time direction may be referred to as DU resource configuration (in Release 16). The information element for setting the type of DU resource in the frequency direction may be referred to as DU resource configuration for Frequency resource.

[0055] As shown in FIG. 5, the types of DU resources in the time direction and the frequency direction may be set simultaneously. In such a case, the type of DU resource can be set arbitrarily. The information element for simultaneously setting the types of DU resources in the time direction and the frequency direction may be referred to as DU resource configuration for T(Time)-F(Frequency) resource.

[0056] (4) Dynamic DU Resources Under the above-described background, in the embodiment, the designation of dynamic DU resources will be mainly described. The designation of dynamic DU resources is executed by an information element (e.g., IA / INA) indicating that it can be used as a DU resource.

[0057] (4.1) First Example In the first example, a case will be exemplified in which a new DCI is defined as a DCI including an information element (IA / INA) indicating that it can be used as a DU resource in the frequency direction. The format of the newly defined DCI may be the newly defined DCI format.

[0058] The new DCI may have a format similar to a DCI (e.g., DCI format 2_5) that includes an information element (e.g., IA / INA) indicating that it is available for use as a DU resource in the time direction.

[0059] For example, as shown in FIG. 6, it may include a number (e.g., N) of Freq_resourceAvailability indicators (Freq_resourceAvailability indicators 1 to N) corresponding to the DU serving cell. Each Freq_resourceAvailability indicator may include a set of availability combinations specified by FreqAvailabilityCombination. Each set of availability combinations may include Freq_resourceAvailability indicating the availability of symbols (hereinafter, soft symbols) in Soft (S) for the DU serving cell, and FreqAvailabilityCombinationID indicating the mapping of availability to the index value of the Freq_resourceAvailability indicator. Freq_resourceAvailability may be an example of an information element (IA / INA) indicating whether it is available for use as a DU resource in the frequency direction. For example, Freq_resourceAvailability may include the following values.

[0060] 0…No indication about the availability of soft symbol 1…DL soft symbol is available, and there is no indication about UL and Flexible soft symbols 2…UL soft symbol is available, and there is no indication for DL and Flexible soft symbol 3…DL and UL soft symbols are available, and there is no indication for Flexible soft symbol 4…Flexible soft symbol is available, and there is no indication for DL and UL soft symbols 5…DL and Flexible soft symbols are available, and there is no indication for UL 6…UL and Flexible soft symbols are available, and there is no indication for DL 7…DL, UL, and Flexible soft symbols are available Note that the Flexible soft symbol is a soft symbol that can be used for both DL and UL.

[0061] As shown in Figure 7, Freq_resourceAvailability may specify a common information element (IA / INA) for all units (e.g., slots) in the time direction (Applicable time duration in Figure 7) as an information element (IA / INA) indicating whether it can be used as a DU resource in the frequency direction. The unit in the time direction may be a slot. The Applicable time duration is the period to which the DCI is applied, and in Figure 7, a case where the Applicable time duration is 4 slots is illustrated.

[0062] In such a case, the Freq_resourceAvailability indicator may include an information element (IA / INA) corresponding to the number of units (e.g., subcarriers) in the frequency direction.

[0063] As described above, the IAB node (e.g., the wireless communication node 100B) receives, as DCI specifying the frequency resources available in the frequency direction as DU resources, DCI that is commonly applicable to all units of the time resources available in the time direction as DU resources during the applicable time duration to which the DCI is applied. The DCI specifying the frequency resources available in the frequency direction as DU resources is a DCI defined separately from the DCI (e.g., DCI format 2_5) specifying the time resources available in the time direction as DU resources.

[0064] As shown in FIG. 8, Freq_resourceAvailability may be an information element that specifies individual information elements (IA / INA) for one unit (e.g., a slot) in the time direction, as an information element (IA / INA) indicating whether it is available as a DU resource in the frequency direction. The unit in the time direction may be a slot. The Applicable time duration is the period to which the DCI is applied, and in FIG. 8, a case where the Applicable time duration is 4 slots is illustrated.

[0065] In such a case, Freq_resourceAvailability may include an Indication for each unit in the time direction. For example, as shown in FIG. 9, Freq_resourceAvailability may include an Indication corresponding to the number (X) of units in the time direction. Each Indication may include an information element (IA / INA) corresponding to the number (Y) of units in the frequency direction. For example, taking the case shown in FIG. 8 as an example when "1" means IA and "0" means INA, Freq_resourceAvailability may include four Indications such as "011", "001", "010", and "111".

[0066] Alternatively, Freq_resourceAvailability may include an Indication for each unit in the frequency direction. For example, as shown in FIG. 10, Freq_resourceAvailability may include an Indication corresponding to the number (Y) of units in the frequency direction. Each Indication may include an information element (IA / INA) corresponding to the number (X) of units in the time direction. For example, taking the case shown in FIG. 8 as an example when "1" means IA and "0" means INA, Freq_resourceAvailability may include three Indications such as "0001", "1011", and "1101".

[0067] As described above, the IAB node (e.g., the wireless communication node 100B) receives, as DCI specifying the frequency resources available in the frequency direction as DU resources, DCI that is individually applied for each unit of the time resources available in the time direction as DU resources during the applicable time duration to which the DCI is applied. The DCI specifying the frequency resources available in the frequency direction as DU resources is a DCI defined separately from the DCI (e.g., DCI format 2_5) specifying the time resources available in the time direction as DU resources.

[0068] In FIGS. 9 and 10, for clarity of explanation, a case where the values that the Indicator can take are two types, "0 (=INA)" and "1 (=IA)", is illustrated. However, the values that the Indicator can take may be any one or more of the eight types from "0" to "7" described above.

[0069] (4.2) Second example In the second example, an example is given of a case where a DCI (for example, DCI format 2_5) including an information element (IA / INA) indicating that it can be used as a DU resource in the time domain is extended as a DCI including an information element (IA / INA) indicating that it can be used as a DU resource in the frequency domain.

[0070] For example, as shown in FIG. 11, the Freq_resourceAvailability indicator may include Freq_resourceAvailability that directly specifies the Soft (S) frequency resource. The content of Freq_resourceAvailability may be the same as the cases shown in FIGS. 6 to 10.

[0071] The position of the Freq_resourceAvailability indicator may be predetermined. For example, the position of the Freq_resourceAvailability indicator may be after the Available indicator for the same DU serving cell. The position of the Freq_resourceAvailability indicator may be before the Available indicator for the same DU serving cell. The position of the Freq_resourceAvailability indicator may be set by an RRC message independently of the Available indicator.

[0072] Here, the Freq_resourceAvailability indicator only needs to exist for at least one DU serving cell. That is, DU serving cells with the Freq_resourceAvailability indicator and DU serving cells without the Freq_resourceAvailability indicator may coexist.

[0073] Alternatively, as shown in FIG. 12, the Freq_resourceAvailability indicator may include a set of availability combinations specified by the FreqAvailabilityCombination, similar to the example shown in FIG. 6. Each set of availability combinations may include Freq_resourceAvailability indicating the availability of soft symbols for the DU serving cell, and FreqAvailabilityCombinationID indicating the mapping of Freq_resourceAvailability to the index value of the Freq_resourceAvailability indicator. The content of Freq_resourceAvailability may be the same as the cases shown in FIGS. 6 to 10.

[0074] The mapping between FreqAvailabilityCombinationID and FreqAvailabilityCombination may be set by an RRC message. Similar to the case shown in FIG. 11, the position of the Freq_resourceAvailability indicator may be predefined or set by an RRC message.

[0075] Alternatively, as shown in FIG. 13, the Available indicator included in an existing DCI (e.g., DCI format 2_5) may include an availabilityCombinationID indicating the mapping of AvailabilityCombination and Freq_resourceAvailabilityCombination. Freq_resourceAvailabilityCombination indicates the mapping of Freq_resourceAvailability to the index value of the Availability indicator. The content of Freq_resourceAvailability may be the same as the cases shown in FIGS. 6 to 10.

[0076] The mapping between AvailabilityCombination and FreqAvailabilityCombination may be set by an RRC message. The mapping between FreqAvailabilityCombination and FreqAvailabilityCombination may be set by an RRC message.

[0077] Note that an extended DCI of an existing DCI (e.g., DCI format 2_5) may be newly defined as a DCI having a new DCI format.

[0078] As described above, an IAB node (e.g., the wireless communication node 100B) receives, as a DCI specifying a frequency resource that can be used as a DU resource in the frequency direction, a DCI applied to one or more units in the time direction as a DU resource during an applicable time duration to which the DCI is applied. The DCI specifying a frequency resource that can be used as a DU resource in the frequency direction is an extended DCI of a DCI (e.g., DCI format 2_5) specifying a time resource that can be used as a DU resource in the time direction.

[0079] In FIGS. 9 and 10, for clarity of explanation, a case is exemplified in which the values that the Indicator can take are two types, "0 (= INA)" and "1 (= IA)". However, the values that the Indicator can take may be any of the eight types of "0" to "7" described above.

[0080] (4.3) Third example In the third example, a case is exemplified in which a new DCI is defined as a DCI including an information element (IA / INA) indicating that it can be used as a DU resource in the frequency direction. The format of the newly defined DCI may be a newly defined DCI format.

[0081] The new DCI may be a DCI that simultaneously specifies time resources and frequency resources as DU resources. The new DCI may have a format similar to a DCI (e.g., DCI format 2_5) that includes an information element (IA / INA) indicating that it is available as a DU resource in the time direction.

[0082] For example, as shown in FIG. 14, it may include a number (e.g., N) of TF_resourceAvailability indicators (TF_resourceAvailability indicators 1 to N) corresponding to the DU serving cell. Each TF_resourceAvailability indicator may include a set of availability combinations specified by TF_resourceAvailabilityCombination. Each set of availability combinations may include TF_resourceAvailability indicating the availability of symbols (hereinafter, soft symbols) in Soft (S) for the DU serving cell, and TFAvailabilityCombinationID indicating the mapping of availability to the index value of the TF_resourceAvailability indicator. TF_resourceAvailability may be an example of an information element (IA / INA) indicating whether it is available as a DU resource in both the time direction and the frequency direction.

[0083] Here, TF_resourceAvailability indicating whether time resources and frequency resources are available may be represented in the form of a bitmap. As shown in FIG. 15, the bitmap may have an arrangement order that is shifted in the time direction after being arranged in the order of the frequency direction. In the case shown in FIG. 15, the bitmap may be represented by "10", "110", "01". In the bitmap, the TF_resourceAvailability of Hard and NA may be omitted. Alternatively, as shown in FIG. 16, the bitmap may have an arrangement order that is shifted in the frequency direction after being arranged in the order of the time direction. In the case shown in FIG. 16, the bitmap may be represented by "1", "110", "001". In the bitmap, the TF_resourceAvailability of Hard and NA may be omitted.

[0084] In such a case, the IAB node (e.g., the wireless communication node 100B) may assume reception of either a new DCI including TF_resourceAvailability or an existing DCI (e.g., DCI format 2_5). For example, when the IAB node supports the new DCI, it may assume reception of the new DCI. When the IAB node does not support the new DCI, it may assume reception of the existing DCI.

[0085] Alternatively, the IAB node (e.g., the wireless communication node 100B) may assume reception of both a new DCI including TF_resourceAvailability and an existing DCI (e.g., DCI format 2_5). The IAB node may determine which of the new DCI and the existing DCI to apply based on whether it supports FDM. For example, when the IAB node supports FDM, it may assume application of the new DCI. When the IAB node does not support FDM, it may assume application of the existing DCI.

[0086] Whether the IAB node supports FDM may be set or specified by the IAB donor or parent node. Whether the IAB node supports FDM may be set or specified by at least any one of the RRC message, MAC CE message, and DCI. Whether the IAB node supports FDM may be reported by the IAB node by at least any one of the RRC message, MAC CE message, and DCI. Whether the IAB node supports FDM may be set or specified by the IAB donor or parent node based on the report from the IAB node to the IAB donor or parent node. Whether the IAB node supports FDM may be set or specified explicitly or implicitly.

[0087] At least any one of the setting, specifying, and reporting of whether the IAB node supports FDM may be performed for each DU serving cell.

[0088] As described above, the IAB node (for example, the wireless communication node 100B) receives, as DCI specifying the frequency resource available in the frequency direction as the DU resource, DCI specifying both the time resource and the frequency resource as the DU resource during the applicable time duration to which the DCI is applied. The DCI specifying the frequency resource available in the frequency direction as the DU resource is a DCI defined separately from the DCI (for example, DCI format 2_5) specifying the time resource available in the time direction as the DU resource.

[0089] (4.4) The fourth example In the third example, an example is given of a case where a DCI (e.g., DCI format 2_5) including an information element (IA / INA) indicating availability as a DU resource in the time direction is extended as a DCI including an information element (IA / INA) indicating availability as a DU resource in the frequency direction. In such a case, the newly defined TF_resourceAvailability for the soft time-frequency symbol may be set by an RRC message. As options for setting the mapping, the following are conceivable.

[0090] In the first option, either one of the mapping between the existing availabilityCombinationID and the new TF_resourceAvailability and the mapping between the existing availabilityCombinationID and the existing resourceAvailability may be set.

[0091] In such a case, when the IAB node (e.g., the wireless communication node 100B) supports FDM, it may be assumed that the mapping between the existing availabilityCombinationID and the new TF_resourceAvailability is set. When the IAB node does not support FDM, it may be assumed that the mapping between the existing availabilityCombinationID and the existing resourceAvailability is set.

[0092] In the second option, both the mapping between the existing availabilityCombinationID and the TF_resourceAvailability and the mapping between the existing availabilityCombinationID and the existing resourceAvailability may be set.

[0093] In such a case, when the IAB node (e.g., the wireless communication node 100B) supports FDM, it may assume the application of the mapping between the existing availabilityCombinationID and the new TF_resourceAvailability. When the IAB node does not support FDM, it may assume the application of the mapping between the existing availabilityCombinationID and the existing resourceAvailability.

[0094] For example, as shown in FIG. 17, the RRC message may include AvailabilityCombination-r16. AvailabilityCombination-r16 may include the existing availabilityCombinationid-r16 and resourceAvailability-r16. Furthermore, AvailabilityCombination-r16 may include the new TF_resourceAvailability.

[0095] In the third option, both the mapping between the new TF_availabilityCombinationID and TF_resourceAvailability and the mapping between the existing availabilityCombinationID and the existing resourceAvailability may be set.

[0096] In such a case, when the IAB node (e.g., the wireless communication node 100B) supports FDM, it may assume the application of the mapping between the new TF_ availabilityCombinationID and the new TF_resourceAvailability. When the IAB node does not support FDM, it may assume the application of the mapping between the existing availabilityCombinationID and the existing resourceAvailability.

[0097] For example, as shown in FIG. 18, the RRC message may include AvailabilityCombination-r16. AvailabilityCombination-r16 may include the existing availabilityCombinationid-r16 and resourceAvailability-r16. Further, the RRC message may include TF_AvailabilityCombination as a new information element. TF_AvailabilityCombination may include a new TF_availabilityCombinationid and a new TF_resourceAvailability-r16.

[0098] Whether the IAB node supports FDM may be set or specified by the IAB donor or the parent node. Whether the IAB node supports FDM may be set or specified by at least any one of the RRC message, the MAC CE message, and the DCI. Whether the IAB node supports FDM may be reported by the IAB node by at least any one of the RRC message, the MAC CE message, and the DCI. Whether the IAB node supports FDM may be set or specified by the IAB donor or the parent node based on the report from the IAB node to the IAB donor or the parent node.

[0099] At least any one of the setting, specifying, and reporting of whether the IAB node supports FDM may be performed for each DU serving cell.

[0100] As described above, the IAB node (e.g., the wireless communication node 100B) receives, as DCI that specifies a frequency resource that can be used in the frequency direction as a DU resource, DCI that simultaneously specifies a time resource and a frequency resource as DU resources during an applicable time duration to which the DCI is applied. The DCI that specifies a frequency resource that can be used in the frequency direction as a DU resource is a DCI obtained by extending a DCI (e.g., DCI format 2_5) that specifies a time resource that can be used in the time direction as a DU resource.

[0101] (5) Operations and effects According to the above-described embodiment, the following operations and effects can be obtained. Specifically, the IAB node (e.g., the wireless communication node 100B) receives downlink control information (DCI) that specifies a frequency resource that can be used in the frequency direction as a radio resource (DU resource) to be allocated to a radio link (Link_child) with a lower-level node (e.g., the wireless communication node 100C). The IAB node dynamically controls communication using the radio link (Link_child) based on the DCI. According to such a configuration, the frequency resource in the frequency direction that can be used as a DU resource can be dynamically used.

[0102] (6) Other embodiments Although the embodiments have been described above, it is obvious to those skilled in the art that the present invention is not limited to the description of the embodiments, and various modifications and improvements are possible.

[0103] Although not particularly mentioned in the above-described embodiments, capability information indicating whether an IAB node (e.g., the wireless communication node 100B) supports FDM that multiplexes the Backhaul link (DU) and the Access link (MT) may be defined. The IAB node may report the capability information to the IAB donor or the parent node. Operations related to DCI indicating availability as a DU resource in the frequency direction may be applied when capability information indicating support for FDM is reported. Operations related to DCI indicating availability as a DU resource in the frequency direction may not be applied when capability information indicating whether FDM is supported is not reported.

[0104] Although not particularly mentioned in the above-described embodiments, operations related to DCI indicating availability as a DU resource in the frequency direction may be applied when set by upper layer signaling. Operations related to DCI indicating availability as a DU resource in the frequency direction may not be applied when not set by upper layer signaling.

[0105] In the above-described embodiments, the names of the parent node, IAB node, and child node were used. However, as long as a configuration of a wireless communication node integrating wireless backhaul between wireless communication nodes such as gNB and wireless access to a terminal is adopted, the names may be different. For example, they may simply be called the first, second nodes, etc., or may be called the upper node, lower node, or relay node, intermediate node, etc.

[0106] Furthermore, the wireless communication node may simply be called a communication device or communication node, or may be read as a wireless base station.

[0107] The block diagram (FIG. 3) used in the description of the above-described embodiment shows blocks in terms of functions. These functional blocks (components) are realized by any combination of at least one of hardware and software. Also, the method of realizing each functional block is not particularly limited. That is, each functional block may be realized using one physically or logically combined device, or two or more physically or logically separated devices may be directly or indirectly (e.g., using wired, wireless, etc.) connected and realized using these multiple devices. The functional block may be realized by combining software with the above one device or the above multiple devices.

[0108] Functions include, but are not limited to, judgment, decision, determination, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, solution, selection, selection determination, establishment, comparison, assumption, expectation, regarded as, notification (broadcasting), notification (notifying), communication (communicating), forwarding, configuration (configuring), reconfiguration (reconfiguring), allocation (allocating, mapping), assignment (assigning), etc. For example, a functional block (component) that functions to transmit is called a transmitting unit or a transmitter. As described above, the realization method is not particularly limited.

[0109] Furthermore, the above-described wireless communication nodes 100A to 100C (the device) may function as a computer that performs the processing of 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, and a bus 1007, etc.

[0110] In the following description, the term "device" can be read as a circuit, a device, a unit, etc. The hardware configuration of the device may be configured to include one or more of the devices shown in the figure, or may be configured without including some of the devices.

[0111] Each functional block of the device (see Figure 3) is realized by any hardware element of the computer device or a combination of the hardware elements.

[0112] Also, each function in the device is realized by loading a predetermined software (program) onto hardware such as the processor 1001 and the memory 1002, so that the processor 1001 performs calculations, controls communication by the communication device 1004, or controls at least one of reading and writing data in the memory 1002 and the storage 1003.

[0113] The processor 1001 controls the entire computer by operating an operating system, for example. The processor 1001 may be composed of a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, a register, and the like.

[0114] Also, 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 for causing a computer to execute at least a part of the operations described in the above embodiments is used. Further, the above various processes may be executed by one processor 1001, or may be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 may be mounted by one or more chips. Note that the program may be transmitted from a network via a telecommunication line.

[0115] The memory 1002 is a computer-readable recording medium and may be constituted by at least one of, for example, Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), 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 can store a program (program code), a software module, etc. that can execute the method according to an embodiment of the present disclosure.

[0116] The storage 1003 is a computer-readable recording medium and may be constituted by at least one of, for example, an optical disk such as a Compact Disc ROM (CD-ROM), a hard disk drive, a flexible disk, a magneto-optical disk (for example, a compact disc, a digital versatile disc, a Blu-ray (registered trademark) disc), a smart card, a flash memory (for example, a card, a stick, a key drive), a floppy (registered trademark) disk, a magnetic strip, etc. The storage 1003 may also be referred to as an auxiliary storage device. The above-described recording medium may be, for example, a database, a server, or other appropriate media including at least one of the memory 1002 and the storage 1003.

[0117] The communication device 1004 is hardware (a transmission / reception device) for performing communication 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, etc.

[0118] The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. in order to implement at least one of, for example, Frequency Division Duplex (FDD) and Time Division Duplex (TDD).

[0119] The input device 1005 is an input device that receives external input (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.). The output device 1006 is an output device that performs output to the outside (for example, a display, a speaker, an LED lamp, etc.). Note that the input device 1005 and the output device 1006 may have an integrated configuration (for example, a touch panel).

[0120] Also, each device such as the processor 1001 and the memory 1002 is connected by 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.

[0121] Furthermore, the device may be configured to include hardware such as a microprocessor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Programmable Logic Device (PLD), a Field Programmable Gate Array (FPGA), etc., and part or all of each functional block may be realized by the hardware. For example, the processor 1001 may be implemented using at least one of these hardware components.

[0122] In addition, the notification of information is not limited to the aspects / embodiments described in the present disclosure, and other methods may be used. For example, the notification of information may be implemented by physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI)), upper layer signaling (e.g., RRC signaling, Medium Access Control (MAC) signaling, notification information (Master Information Block (MIB), System Information Block (SIB))), other signals, or a combination thereof. Also, the RRC signaling may be referred to as an RRC message, and may be, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, etc.

[0123] Each aspect / embodiment described in the present disclosure may be applied to at least one of systems using Long Term Evolution (LTE), LTE-Advanced (LTE-A), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), Future Radio Access (FRA), New Radio (NR), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), other suitable systems, and next-generation systems extended based thereon. Also, a combination of multiple systems (e.g., a combination of at least one of LTE and LTE-A and 5G) may be applied.

[0124] For each processing procedure, sequence, flowchart, etc. described in the present disclosure, the order may be changed as long as there is no contradiction. For example, for the methods described in the present disclosure, the elements of various steps are presented using an exemplary order and are not limited to the specific order presented.

[0125] Specific operations assumed to be performed by a base station in the present disclosure may, in some cases, 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 a terminal can clearly be performed by at least one of the base station and other network nodes other than the base station (for example, but not limited to, an MME or an S-GW, etc.). Although the case where there is one other network node other than the base station has been exemplified above, a combination of a plurality of other network nodes (for example, an MME and an S-GW) may also be possible.

[0126] Information, signals (such as information) can be output from an upper layer (or a lower layer) to a lower layer (or an upper layer). They may also be input and output via a plurality of network nodes.

[0127] The input and output information may be stored in a specific location (for example, a memory) or may be managed using a management table. The input and output information can be overwritten, updated, or appended. The output information may be deleted. The input information may be transmitted to other devices.

[0128] The determination may be made based on a value represented by 1 bit (0 or 1), may be made based on a Boolean value (true or false), or may be made based on a numerical comparison (for example, comparison with a predetermined value).

[0129] Each aspect / embodiment described in the present disclosure may be used alone, in combination, or switched and used during execution. Further, the notification of predetermined information (for example, the notification of "being X") is not limited to being explicitly performed, and may be performed implicitly (for example, by not performing the notification of the predetermined information).

[0130] Software should be broadly construed to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, etc., whether called software, firmware, middleware, microcode, a hardware description language, or by any other name.

[0131] Also, software, instructions, information, etc. may be transmitted and received via a transmission medium. For example, when software is transmitted from a website, server, or other remote source using at least one of wired technologies (such as coaxial cable, optical fiber cable, twisted pair, Digital Subscriber Line (DSL), etc.) and wireless technologies (such as infrared, microwave, etc.), at least one of these wired and wireless technologies is included within the definition of the transmission medium.

[0132] The information, signals, etc. described in the present disclosure may be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc., which may be referred to throughout the above description, may be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0133] In addition, with regard to the terms described in the present disclosure and the terms necessary for understanding the present disclosure, they 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, a signal may be a message. Further, a component carrier (CC) may be referred to as a carrier frequency, a cell, a frequency carrier, or the like.

[0134] The terms "system" and "network" used in the present disclosure are used interchangeably.

[0135] Also, the information, parameters, etc. described in the present disclosure may be represented using absolute values, relative values from a predetermined value, or corresponding other information. For example, a radio resource may be indicated by an index.

[0136] The names used for the above-described parameters are not limiting in any way. Furthermore, mathematical formulas and the like using these parameters may be different from those explicitly disclosed in the present disclosure. Since various channels (e.g., PUCCH, PDCCH, etc.) and information elements can be identified by any suitable names, the various names assigned to these various channels and information elements are not limiting in any way.

[0137] In the present disclosure, terms such as "Base Station (BS)", "radio base station", "fixed station", "NodeB", "eNodeB (eNB)", "gNodeB (gNB)", "access point", "transmission point", "reception point", "transmission / reception point", "cell", "sector", "cell group", "carrier", and "component carrier" may be used interchangeably. The base station may also be referred to by terms such as macro cell, small cell, femto cell, and pico cell.

[0138] A base station can accommodate one or more (e.g., 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, and each smaller area can also provide communication services by a base station subsystem (e.g., a small indoor base station (Remote Radio Head: RRH)).

[0139] The term "cell" or "sector" refers to a part or the whole of the coverage area of at least one of the base station and the base station subsystem that provides communication services within this coverage.

[0140] In the present disclosure, terms such as "Mobile Station (MS)", "user terminal", "User Equipment (UE)", and "terminal" may be used interchangeably.

[0141] A mobile station may also be referred to by those skilled in the art as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable term.

[0142] At least one of the base station and the mobile station may be referred to as a transmitting device, a receiving device, a communication device, etc. Note that at least one of the base station and the mobile station may be a device mounted on a moving body, the moving body itself, etc. The moving body may be a vehicle (e.g., a car, an airplane, etc.), a moving body that moves without a driver (e.g., a drone, a self-driving vehicle, etc.), or a robot (humanoid or non-humanoid). Note that at least one of the base station and the mobile station also includes a device that does not necessarily move during communication operation. 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.

[0143] Also, the base station in the present disclosure may be read as a mobile station (user terminal, the same hereinafter). For example, each aspect / embodiment of the present disclosure may be applied to a configuration in which communication between a base station and a mobile station is replaced with communication between a plurality of mobile stations (which may be referred to as, for example, Device-to-Device (D2D), Vehicle-to-Everything (V2X), etc.). In this case, the functions of the base station may be configured as functions of the mobile station. Also, terms such as "uplink" and "downlink" may be read as terms corresponding to communication between terminals (e.g., "side"). For example, an uplink channel, a downlink channel, etc. may be read as a side channel.

[0144] Similarly, the mobile station in the present disclosure may be read as a base station. In this case, the functions of the mobile station may be configured as functions of the base station. The wireless frame may be composed of one or more frames in the time domain. Each of the one or more frames in the time domain may be called a subframe. The subframe may further be composed of one or more slots in the time domain. The subframe may have a fixed time length (e.g., 1 ms) that does not depend on numerology.

[0145] Numerology may be communication parameters applied to at least one of transmission and reception of a certain signal or channel. Numerology may indicate, for example, at least one of subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, wireless frame configuration, specific filtering processing performed by the transceiver in the frequency domain, specific windowing processing performed by the transceiver in the time domain, etc.

[0146] A slot may be composed of one or more symbols (Orthogonal Frequency Division Multiplexing (OFDM) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, etc.) in the time domain. A slot may be a time unit based on numerology.

[0147] A slot may include a plurality of minislots. Each minislot may be composed of one or more symbols in the time domain. Also, a minislot may be called a subslot. A minislot may be composed of a smaller number of symbols than a slot. The PDSCH (or PUSCH) transmitted in a time unit larger than a minislot may be called PDSCH (or PUSCH) mapping type A. The PDSCH (or PUSCH) transmitted using a minislot may be called PDSCH (or PUSCH) mapping type B.

[0148] A radio frame, subframe, slot, minislot, and symbol all represent time units for transmitting signals. Different names corresponding to each of them may be used.

[0149] For example, one subframe may be called a transmission time interval (TTI), a plurality of consecutive subframes may be called a TTI, or one slot or one minislot may be called a TTI. That is, at least one of the subframe and the TTI may be a subframe (1 ms) in the existing LTE, a period shorter than 1 ms (e.g., 1 - 13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, minislot, etc. instead of a subframe.

[0150] Here, the TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in an LTE system, the base station performs scheduling to allocate radio resources (frequency bandwidth, transmission power, etc. that can be used at each user terminal) to each user terminal in units of TTI. Note that the definition of the TTI is not limited to this.

[0151] The TTI may be a transmission time unit for a channel - encoded data packet (transport block), code block, codeword, etc., or may be a processing unit for scheduling, link adaptation, etc. Note that when a TTI is given, the time interval (e.g., the number of symbols) in which a transport block, code block, codeword, etc. are actually mapped may be shorter than the TTI.

[0152] When one slot or one mini-slot is called a TTI, one or more TTIs (i.e., one or more slots or one or more mini-slots) may be the minimum time unit for scheduling. Also, the number of slots (number of mini-slots) constituting the minimum time unit of the scheduling may be controlled.

[0153] 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, etc. A TTI shorter than a normal TTI may be called a shortened TTI, a short TTI, a partial TTI (partial or fractional TTI), a shortened subframe, a short subframe, a mini-slot, a sub-slot, a slot, etc.

[0154] Note that a long TTI (e.g., a normal TTI, a subframe, etc.) may be read as a TTI having a time length exceeding 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be read as a TTI having a TTI length less than that of a long TTI and not less than 1 ms.

[0155] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and in the frequency domain, it may include one or a plurality of consecutive subcarriers. The number of subcarriers included in an RB may be the same regardless of the numerology, for example, it may be 12. The number of subcarriers included in an RB may be determined based on the numerology.

[0156] Also, the time domain of an RB may include one or a plurality of symbols, and may be the length of 1 slot, 1 mini-slot, 1 subframe, or 1 TTI. 1 TTI, 1 subframe, etc. may each be composed of one or a plurality of resource blocks.

[0157] Note that one or more RBs may be referred to as a Physical Resource Block (PRB), a Sub-Carrier Group (SCG), a Resource Element Group (REG), a PRB pair, an RB pair, etc.

[0158] Also, a resource block may be composed of one or more Resource Elements (REs). For example, 1 RE may be a radio resource region of 1 sub-carrier and 1 symbol.

[0159] A Bandwidth Part (BWP) (which may also be called a partial bandwidth, etc.) may represent a subset of consecutive common resource blocks (common RBs) for a certain numerology in a certain carrier. Here, the common RB may be specified by the index of the RB based on the common reference point of the carrier. The PRB is defined in a certain BWP and may be numbered within the BWP.

[0160] 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 set within one carrier.

[0161] At least one of the set BWPs may be active, and it may not be assumed that the UE transmits and receives a predetermined signal / channel outside the active BWP. Note that "cell", "carrier", etc. in the present disclosure may be read as "BWP".

[0162] The structures such as the above-mentioned radio frame, sub-frame, slot, mini-slot, and symbol are merely illustrative. For example, the number of sub-frames included in a radio frame, the number of slots per sub-frame or radio frame, the number of mini-slots included in a slot, the number of symbols and RBs included in a slot or mini-slot, the number of sub-carriers included in an RB, and the number of symbols, symbol length, Cyclic Prefix (CP) length, etc. within a TTI can be variously changed.

[0163] The terms "connected" and "coupled", or any variations thereof, mean any direct or indirect connection or coupling between two or more elements, and can include the presence of one or more intermediate elements between two elements "connected" or "coupled" to each other. The coupling or connection between elements can be physical, logical, or a combination thereof. For example, "connected" may be read as "accessed". As used in this disclosure, two elements can be considered to be "connected" or "coupled" to each other using at least one of one or more electric wires, cables, and printed electrical connections, and also, by way of some non-limiting and non-exhaustive examples, electromagnetic energy having wavelengths in the radio frequency region, microwave region, and optical (both visible and invisible) region.

[0164] The reference signal can also be abbreviated as Reference Signal (RS) and may be called Pilot depending on the applicable standard.

[0165] As used in this disclosure, the description "based on" does not mean "based only on" unless otherwise specified. In other words, the description "based on" means both "based only on" and "based at least on".

[0166] The "means" in the configuration of each of the above devices may be replaced with "section", "circuit", "device", etc.

[0167] Any reference to an element using designations such as "first", "second", etc. used in this disclosure does not generally limit the quantity or order of those elements. These designations can be used in this disclosure as a convenient way to distinguish between two or more elements. Thus, a reference to a first and a second element does not mean that only two elements can be employed there, or that the first element must precede the second element in any way.

[0168] In this disclosure, when terms such as "include", "including" and their variants are used, these terms are intended to be inclusive in the same manner as the term "comprising". Further, the term "or" used in this disclosure is intended not to be an exclusive disjunction.

[0169] In this disclosure, for example, when articles are added by translation, such as a, an and the in English, this disclosure may include that the nouns following these articles are in the plural form.

[0170] As used herein, the terms "determining" and "deciding" may encompass a wide variety of operations. "Determining" and "deciding" may include, for example, judging, calculating, computing, processing, deriving, investigating, looking up (e.g., searching a table, database, or other data structure), ascertaining, and considering something as having been "determined" or "decided". "Determining" and "deciding" may also include receiving (e.g., receiving information), transmitting (e.g., transmitting information), inputting, outputting, accessing (e.g., accessing data in a memory), and considering something as having been "determined" or "decided". "Determining" and "deciding" may further include resolving, selecting, choosing, establishing, comparing, and the like, and considering something as having been "determined" or "decided". That is, "determining" and "deciding" may include considering something as having been "determined" or "decided" through some operation. Also, "determining (deciding)" may be read as "assuming", "expecting", "considering", or the like.

[0171] As used herein, the term "A and B are different" may mean that "A and B are different from each other". Note that the term may also mean that "A and B are each different from C". Terms such as "separated" and "coupled" may be interpreted in the same manner as "different".

[0172] As described above in detail, it is obvious 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 in the form of modifications and variations without departing from the spirit and scope of the present disclosure defined by the claims. Therefore, the description of the present disclosure is for illustrative purposes only and does not have any limiting meaning for the present disclosure.

Explanation of Signs

[0173] 10 Wireless communication system 100A, 100B, 100C Wireless communication nodes 110 Wireless signal transceiver 120 Amplifier section 130 Modulation / demodulation section 140 Control signal processing section 150 Encoding / decoding section 160 Data transceiver 170 Control section 200 UE C1, C2, C3 Cells 1001 Processor 1002 Memory 1003 Storage 1004 Communication device 1005 Input device 1006 Output device 1007 Bus

Claims

1. A wireless communication node, comprising: a receiving unit that receives an RRC message including a first information element indicating a resource available as a radio resource and receives downlink control information including an indicator; a control unit that dynamically controls communication using a radio link with a lower node of the wireless communication node based on the indicator; wherein the indicator is an indicator that specifies, for each frequency unit, whether a resource is available as the radio resource to be allocated to the radio link.

2. The wireless communication node according to claim 1, wherein the receiving unit receives an RRC message including a second information element indicating a mapping between a value included in the indicator and the first information element.

3. The wireless communication node according to claim 1, wherein the receiving unit receives an RRC message including a third information element indicating a position of a field of the indicator in the downlink control information.

4. A wireless communication method, comprising the steps of: a wireless communication node receiving an RRC message including a first information element indicating a resource available as a radio resource and receiving downlink control information including an indicator; the wireless communication node dynamically controlling communication using a radio link with a lower node of the wireless communication node based on the indicator; wherein the indicator is an indicator that specifies, for each frequency unit, whether a resource is available as the radio resource to be allocated to the radio link.

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