Wireless communication node and wireless communication method

Abstract

The present invention discloses a radio communication node including a control unit that controls a first radio link established with an upper node via a non-ground node and a second radio link established with a lower node, and a transmission unit that transmits, to the upper node, information on uplink transmission timing in the first radio link.

Description

[Technical Field]

[0001] The present disclosure relates to a wireless communication node and a wireless communication method.

[0002] Long Term Evolution (LTE) has been specified for Universal Mobile Telecommunication System (UMTS) networks, aiming to achieve higher data rates and lower latency. Furthermore, successor systems to LTE are also being considered, aiming to achieve even wider bandwidth and higher speeds than LTE. Examples of successor systems to LTE include LTE-Advanced (LTE-A), Future Radio Access (FRA), 5th generation mobile communication system (5G), 5G plus (5G+), Radio Access Technology (New-RAT), and New Radio (NR).

[0003] In addition, NR is studying Integrated Access and Backhaul (IAB) technology, which integrates access links and backhaul links. In IAB, a wireless communication node such as an IAB node forms a wireless access link with a terminal (User Equipment (UE)) and also forms a wireless backhaul link with other IAB nodes, wireless base stations, etc.

[0004] An IAB node has a Mobile Termination (MT), which is a function for wireless communication with a parent node (another IAB node located one node upstream), and a Distributed Unit (DU), which is a function for wireless communication with a child node (another IAB node located one node downstream) or a terminal. Note that, hereinafter, the MT of an IAB node may be referred to as "IAB-MT," and the DU of an IAB node may be referred to as "IAB-DU."

[0005] Non-patent documents 1 and 2 specify the derivation of the transmission timing of IAB-DU for achieving synchronization between IAB nodes in a terrestrial network.

[0006] Currently, non-terrestrial networks (NTNs) are being considered for NR (Non-Patent Document 3). NTNs use non-terrestrial networks such as satellites to provide services to areas that cannot be covered by terrestrial 5G networks, mainly due to cost reasons. NTNs can provide more reliable services. For example, they are expected to be applied to the Internet of Things (IoT), ships, buses, trains, and critical communications. NTNs also have scalability through efficient multicast or broadcast.

[0007] The NTN forms a backhaul link with the IAB node, and the IAB node forms an access link with the terminal, which has the advantage that the terminal does not need to access the NTN. [Prior art documents] [Non-patent literature]

[0008] [Non-Patent Document 1] 3GPP TS 38.213 V16.5.0 (2021-03) [Non-patent document 2] 3GPP TR 38.874 V16.0.0 (2018-12) [Non-patent document 3] 3GPP TR 38.821 V16.0.0 (2019-12) Summary of the Invention

[0009] One objective of the present disclosure is to provide a technique for utilizing non-terrestrial networks in IAB.

[0010] According to one aspect of the present disclosure, there is provided a wireless communication node having a control unit that controls a first wireless link with an upper node via a non-terrestrial node and a second wireless link with a lower node, and a transmission unit that transmits uplink transmission timing information for the first wireless link to the upper node. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a schematic diagram illustrating a wireless communication system according to one embodiment of the present disclosure. [Figure 2] FIG. 1 is a schematic diagram illustrating a wireless communication system according to another embodiment of the present disclosure. [Figure 3] FIG. 2 is a block diagram illustrating a configuration example of an IAB node according to an embodiment of the present disclosure. [Figure 4] 1 is a schematic diagram illustrating a wireless link in a wireless communication system according to one embodiment of the present disclosure. [Figure 5] FIG. 1 illustrates resource overlap according to one embodiment of the present disclosure. [Figure 6] FIG. 1 illustrates UL and DL resources for IAB without NTN. [Figure 7] FIG. 1 illustrates UL and DL resources for IAB according to one embodiment of the present disclosure. [Figure 8] FIG. 2 is a block diagram illustrating a functional configuration of a wireless communication node according to an embodiment of the present disclosure. [Figure 9] FIG. 2 is a block diagram illustrating a functional configuration of a terminal according to an embodiment of the present disclosure. [Figure 10] FIG. 2 is a block diagram illustrating a hardware configuration of a wireless communication node and a terminal according to an embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings.

[0013] <Wireless communication system> FIG. 1 is a schematic diagram illustrating a wireless communication system according to one embodiment of the present disclosure.

[0014] As shown in FIG. 1, the wireless communication system 1 includes two wireless communication nodes 10A and 10B, a terminal (UE) 20, a satellite 30, a gateway 40, and a core network 50. In the illustrated embodiment, the wireless communication nodes 10A and 10B constitute IAB nodes, with the wireless communication node 10A being a base station gNB as a parent IAB node and the wireless communication node 10B being a base station as a child IAB node. As shown in the figure, the wireless communication nodes 10A and 10B according to this embodiment are wirelessly connected via the satellite 30 and the gateway 40. Hereinafter, when the IAB nodes 10A and 10B are described without distinction, only common reference numerals may be used, such as "IAB node 10." Furthermore, the satellite 30 and the gateway 40 may be collectively referred to as the NTN 30.

[0015] The wireless communication node 10B establishes an access link for wireless communication with the terminal 20 via the access link, and establishes a backhaul link and a feeder link for wireless communication with the wireless communication node 10A via the satellite 30 and the gateway 40. In the wireless communication system 1, an existing interface for NR, such as NR Uu or NG, may be used.

[0016] However, the wireless communication system according to the present disclosure is not limited to the above, and as shown in FIG. 2, an inter-satellite link may be provided between multiple satellites 30A and 30B, and a backhaul link, an inter-satellite link, and a feeder link may be set between the wireless communication nodes 10A and 10B.

[0017] FIG. 3 is a block diagram showing an example configuration of an IAB node according to an embodiment of the present disclosure. As shown in FIG. 3, the IAB node 10 includes a control unit 100, a mobile termination (MT) 102, and a distributed unit (DU) 103. The control unit 100 controls the MT 102 and the DU 103. The MT 103 performs wireless communication with a parent node or upper node of the IAB node 10. The DU 103 performs wireless communication with a child node or lower node, and with a terminal 20. Here, the parent node or upper node may also be referred to as a donor. Note that the configuration of the IAB node is not limited to this.

[0018] FIG. 4 is a schematic diagram illustrating a wireless link in a wireless communication system according to an embodiment of the present disclosure. As shown in FIG. 4, for an IAB node 10B, a wireless backhaul link called Link_parent is established between the IAB node 10B and its parent IAB node 10A. The IAB node 10B uses a MT 102, and the parent IAB node 10A uses a DU to transmit and receive data over Link_parent. In this case, the IAB node 10B is a child node or subordinate node of the parent IAB node 10A, and the parent IAB node 10A is a parent node or superior node of the IAB node 10B. Downlink transmission from the parent IAB node 10A to the IAB node 10B via a non-terrestrial node (NTN) 30 is performed via a DL Parent BH, and uplink transmission from the IAB node 10B to the parent IAB node 10A via the NTN 30 is performed via a UL Parent BH.

[0019] Meanwhile, a wireless backhaul link called Link_child is established between the IAB node 10B and the child IAB node 10C, and the IAB node 10B transmits and receives data on Link_child using the DU 103 and the child IAB node 10C uses the MT 102. In this case, the IAB node 10B is the parent node or upper node of the child IAB node 10C, and the child IAB node 10C is the child node or lower node of the IAB node 10B. Downlink transmission from the IAB node 10B to the child IAB node 10C is performed via the DL Child BH, and uplink transmission from the child IAB node 10C to the IAB node 10B is performed via the UL Child BH.

[0020] The IAB node 10B may also perform wireless communication with the UE 20 over the cell, and a wireless access link is established between the IAB node 10B and the UE 20. The IAB node 10B uses the DU 103 to transmit data to the UE 20 via DL Access and to receive data from the UE 20 via UL Access.

[0021] Regarding the radio resources used by the DU 103, from the DU's perspective, the downlink (DL), uplink (UL), and flexible time-resource (D / U / F) are classified into one of the types Hard (H), Soft (S), or Not Available (NA). Furthermore, Soft (S) specifies whether it is available or not. Flexible time-resource (F) is a time resource that can be used for both DL and UL. Furthermore, Hard (H) is a radio resource whose corresponding time resource is always available for the Link_child of the DU 103 with a child IAB node or UE, and Soft (S) is a radio resource whose availability for the Link_child of the DU 103 is explicitly or implicitly controlled by the parent IAB node. Furthermore, for Soft (S), the radio resource to be notified can be determined based on whether it is indicated as available (IA) or not (INA). "IA" means that the DU resource is explicitly or implicitly marked as available, and "INA" means that the DU resource is explicitly or implicitly marked as unavailable.

[0022] In Release 16 IAB, guard symbols are provided that are not used by the MT 102 to account for timing misalignment between the MT 102 and the DU 103 when the IAB node 10B transitions between the MT 102 for communicating with the parent IAB node 10A and the DU 103 for communicating with the child IAB node 103 or the UE 20. For example, as shown in Figure 5, the MT 102 cannot use the time resources that overlap between the DU-DL time resources and the MT-UL time resources.

[0023] 6, in the Release 16 IAB, the DU-DL transmission timing of the IAB node 10B is aligned with the P-DU-DL transmission timing of the parent IAB node 10A, so the parent IAB node 10A recognizes the DU-DL transmission timing of the IAB node 10B. Furthermore, the parent IAB node 10A also recognizes the timing advance TA for the IAB node 10B and the time interval X between the P-DU-UL reception frame i and the P-DU-DL transmission frame i of the parent IAB node 10A. If the propagation delay between the parent IAB node 10A and the IAB node 10B is Tp, then the parent IAB node 10A recognizes the propagation delay Tp, since 2Tp + X = TA. Therefore, the parent IAB node 10A can recognize the MT-DL reception timing and MT-UL transmission timing of the IAB node 10B. Furthermore, the parent IAB node 10A can recognize the DU-UL transmission timing of the IAB node 10B based on the number of guard symbols reported from the IAB node 10B.

[0024] In Release 16 IAB, the parent IAB node 10A can recognize the transmission and reception timings of MT-UL, MT-DL, DU-UL, and DU-DL of the IAB node 10B based on the above. In addition, the parent IAB node 10A recognizes the H / S / NA and D / U / F configurations of the IAB node 10B, and can know at what timing MT transmission or reception can or cannot be set.

[0025] On the other hand, in the NTN of Release 17, when the MT 102 of the IAB node 10B establishes a wireless backhaul link with the NTN 30, the timing advance TA is determined by the following formula: T TA =(N TA +N TA, UE-specific +N TA, common +N TA, offset )×T c (1) where N TAis defined as 0 for PRACH and is updated based on the TA Command field. TA,UE-specific is the TA estimated by the UE to compensate for the delay of the service link in advance. TA,common N is a network-controlled common TA and may include any timing offset deemed necessary by the network. TA,offset is a fixed offset used to calculate the timing advance. c is a unit of time such as 10 ms.

[0026] The parent IAB node 10A is N TA,UE-specific If the parent IAB node 10A does not recognize the value of , it cannot recognize the transmission and reception timing of the MT102 of the IAB node 10B via the TA. Furthermore, the parent IAB node 10A cannot recognize the transmission and reception timing of the MT102 of the IAB node based on the guard symbol of Release 16. This is because the value range of the guard symbol of Release 16 is 0 to 4 symbols, while the propagation delay Tp in the NTN can be on the order of milliseconds, as shown in Figure 7.

[0027] If the parent IAB node 10A cannot recognize the transmission and reception timing of the MT 102 of the IAB node 10B, the parent IAB node 10A cannot recognize the timing at which the MT 102 of the IAB node 10B receives MT-DL frame i and the timing at which it starts transmitting MT-UL frame i. In other words, the parent IAB node 10A cannot recognize whether the transmission and reception of the MT 102 of the IAB node 10B overlaps with the (H) / (S) / (NA) symbols of the DU 103.

[0028] As described above, when the MT 102 and DU 103 of the IAB node 10B operate using TDM (Time Division Multiplexing), there is a possibility that the time resources of the MT 102 and DU 103 of the IAB node 10B may overlap. Therefore, the IAB node 10B needs to report the overlapping time resources to the parent IAB node 10A. Furthermore, when the IAB node 10B communicates with the parent IAB node 10A via a non-terrestrial network, there is a possibility that the transmission and reception timing of the MT 102 and the transmission and reception timing of the DU 103 of the IAB node 10B may be significantly separated, as shown in FIG. 7. Conventional symbol-based reporting of overlapping resources is unable to indicate a sufficiently long period of time, and a new scheme for reporting overlapping time resources is therefore required.

[0029] Example 1 In Example 1, an IAB node 10B that wirelessly communicates with a parent IAB node 10A by IAB via an NTN 30 transmits uplink transmission timing information on a backhaul link to the parent IAB node 10A to report information regarding the timing advance (TA) that it sets to the parent IAB node 10A.

[0030] In one embodiment, the uplink transmission timing information may include location information of the IAB node 10B. That is, the IAB node 10B may transmit the latitude and longitude of the location of the IAB node 10B as location information to the parent IAB node 10A via the NTN 30. For example, if the IAB node 10B is fixedly installed, the IAB node 10B may transmit the latitude and longitude indicating its installation location to the parent IAB node 10A. Alternatively, if the IAB node 10B is mobile, the IAB node 10B may measure its current location using any type of positioning technology, such as GNSS (Global Navigation Satellite System) positioning, and transmit the measured latitude and longitude to the parent IAB node 10A. Alternatively, the IAB node 10B may transmit the altitude along with the latitude and longitude as location information to the parent IAB node 10A.

[0031] The IAB node 10B may transmit the location information to the parent IAB node 10A via a Medium Access Control (MAC) information element (CE) or via Radio Resource Control (RRC) signaling.

[0032] Here, the reporting of the location information may be event-triggered. For example, the IAB node 10B may periodically transmit the location information to the parent IAB node 10A. Specifically, the IAB node 10B may use a periodic timer. That is, when the periodic timer expires, the IAB node 10B may transmit the location information to the parent IAB node 10A. The periodic timer may be set by RRC signaling or may be predefined.

[0033] Furthermore, when the location of the IAB node 10B changes, the location information may be reported. Specifically, when the location of the IAB node 10B has changed by a threshold or more from the most recently reported location, the IAB node 10B may report the changed location information to the parent IAB node 10A. The threshold may be set by RRC signaling or may be specified in advance. Alternatively, the threshold may be 0, and when the location of the IAB node 10B changes, the changed location information may be reported to the parent IAB node 10A.

[0034] Alternatively, location information may be reported when the propagation delay between the IAB node 10B and the satellite 30 and / or the parent IAB node 10A changes. Specifically, when the propagation delay changes by a threshold or more from the most recently reported propagation delay value, the IAB node 10B may report the changed location information to the parent IAB node 10A. The threshold may be set by RRC signaling or may be predefined. Alternatively, the threshold may be zero, and the changed location information may be reported to the parent IAB node 10A when the location of the IAB node 10B changes. The threshold may be set by RRC signaling or may be predefined. Alternatively, the threshold may be zero, and the changed location information may be reported to the parent IAB node 10A when the location of the IAB node 10B changes.

[0035] In this way, upon obtaining location information from IAB node 10B, parent IAB node 10A can calculate the propagation delay between parent IAB node 10A and IAB node 10B based on the obtained location information and the position of satellite 30.

[0036] In another embodiment, the uplink transmission timing information may include timing advance related information, where the timing advance related information is T=N TA,UE-specific *T c The IAB node 10B may have a value of T=N as timing advance related information. TA,UE-specific *T c The parent IAB node 10A may report the value of T to the parent IAB node 10A. Upon obtaining the value of T from the IAB node 10B, the parent IAB node 10A may determine the timing advance value TA according to equation (1) based on the obtained value of T.

[0037] However, the timing advance related information T is not limited to the above, and may be N TA,UE-specific The value of (N TA +N TA,UE-specific +N TA,common +N TA,offset) or any value used to calculate the timing advance TA.

[0038] The timing advance related information may be the value of the timing advance (TA) itself, and the IAB node 10B may use the timing advance related information as follows: T=TA=(N TA +N TA,UE-specific +N TA,common +N TA,offset )×T c The value of may be reported to the parent IAB node 10A.

[0039] In this case, the granularity of the reported T value is T c Units, plural T c The unit may be a unit of a symbol, a unit of multiple symbols, a slot, a unit of multiple slots, a subframe, or a unit of multiple subframes. It may also be a unit of a frame, a unit of multiple frames, a millisecond, or a unit of multiple milliseconds.

[0040] The value of T may also be reported in a combination of any two or more of these units. For example, if N1 and N2 are two reported values ​​and G1 and G2 are two predetermined granularities, the value of T may be expressed as N1*G1+N2*G2, where G1 is the slot unit and G2 is the symbol unit. When IAB node 10B reports values ​​of N1 and N2, parent IAB node 10A may determine that the value of T corresponds to a period of N1 slots + N2 symbols.

[0041] Similarly, for example, if N1, N2, and N3 are three reported values ​​and G1, G2, and G3 are three predetermined granularities, then the value of T may be represented by N1*G1+N2*G2+N3*G3, where G1 is in units of frames, G2 is in units of slots, and G3 is in units of symbols. If IAB node 10B reports values ​​of N1, N2, and N3, parent IAB node 10A may determine that the value of T corresponds to a period of N1 frames + N2 slots + N3 symbols.

[0042] The IAB node 10B may transmit timing advance related information to the parent IAB node 10A via a Medium Access Control (MAC) information element (CE) or Radio Resource Control (RRC) signaling.

[0043] Here, the reporting of the timing advance related information may be event-triggered. For example, the IAB node 10B may periodically transmit the timing advance related information to the parent IAB node 10A. Specifically, the IAB node 10B may use a periodic timer. That is, when the periodic timer expires, the IAB node 10B may transmit the timing advance related information to the parent IAB node 10A. The periodic timer may be set by RRC signaling or may be predefined.

[0044] Also, N TA,UE-specific The value of N TA,UE-specific ×T c The value of (N TA +N TA,UE-specific +N TA,common +N TA,offset ) value, or TA=(N TA +N TA,UE-specific +N TA,common +N TA,offset )×T c Timing advance related information may be reported when the value of N changes. TA,UE-specific The value of N TA,UE-specific ×T c The value of (N TA +N TA,UE-specific +N TA,common +N TA,offset ) value, or TA=(N TA +N TA,UE-specific +N TA,common +N TA,offset )×T cWhen the value of t_t changes from the last reported value by more than a threshold, the IAB node 10B may report the changed timing advance information to the parent IAB node 10A. The threshold may be set by RRC signaling or may be predefined. Alternatively, the threshold may be 0, and when the timing advance related information at the IAB node 10B changes, the changed timing advance related information may be reported to the parent IAB node 10A.

[0045] In the above-described embodiment, the IAB node 10B and the parent IAB node 10A perform wireless communication via the NTN 30, but the present disclosure is not limited to this and can also be applied to a case where the UE 20 and the parent IAB node 10A perform wireless communication via the NTN 30. In this case, the UE 20 may report uplink transmission timing information to the gNB 10A via the NTN 30 by the IAB node 10B described above.

[0046] <Example 2> In Examples 2 and 3, an IAB node 10B, which wirelessly communicates with a parent IAB node 10A via an IAB network via an NTN 30, transmits resource overlap information between a backhaul link with the parent IAB node 10A and an access link with the UE 20. In Example 2, the IAB node 10B may report timing misalignment between the MT-UL and DU-UL, timing misalignment between the MT-UL and DU-DL, timing misalignment between the MT-DL and DU-UL, or timing misalignment between the MT-DL and DU-DL to the parent IAB node 10A. For example, the IAB node 10B may report all or some of the timing misalignment between the MT-UL and DU-UL, timing misalignment between the MT-UL and DU-DL, timing misalignment between the MT-DL and DU-UL, and timing misalignment between the MT-DL and DU-DL to the parent IAB node 10A.

[0047] Furthermore, the timing misalignment between MT-UL and DU-UL, the timing misalignment between MT-UL and DU-DL, the timing misalignment between MT-DL and DU-UL, or the timing misalignment between MT-DL and DU-DL may represent the time interval between the start of an MT-UL transmission frame or an MT-DL reception frame and the start of a DU-DL transmission frame or a DU-UL reception frame.

[0048] The IAB node 10B may transmit the timing misalignment via MAC CE or RRC signaling, where the IAB node 10B may report the timing misalignment to the parent IAB node 10A in MAC CE or RRC signaling equal to the number of guard symbols, as described below.

[0049] In this case, the granularity of the reported timing misalignment value is T c Units, plural T c The unit may be a unit of a symbol, a unit of multiple symbols, a slot, a unit of multiple slots, a subframe, or a unit of multiple subframes. It may also be a unit of a frame, a unit of multiple frames, a millisecond, or a unit of multiple milliseconds.

[0050] The timing misalignment value may also be reported in a combination of any two or more of these units. For example, if N1 and N2 are two reported values ​​and G1 and G2 are two predetermined granularities, the timing misalignment value may be expressed as N1*G1+N2*G2, where G1 is the slot unit and G2 is the symbol unit. When IAB node 10B reports values ​​of N1 and N2, parent IAB node 10A may determine that the timing misalignment value corresponds to a period of N1 slots + N2 symbols.

[0051] Similarly, for example, if N1, N2, and N3 are three reported values ​​and G1, G2, and G3 are three predetermined granularities, then the timing misalignment value may be represented by N1*G1+N2*G2+N3*G3, where G1 is in frames, G2 is in slots, and G3 is in symbols. If IAB node 10B reports values ​​for N1, N2, and N3, parent IAB node 10A may determine that the timing misalignment value corresponds to a period of N1 frames + N2 slots + N3 symbols.

[0052] Here, the reporting of the timing misalignment may be event-triggered. For example, the IAB node 10B may periodically transmit the timing misalignment to the parent IAB node 10A. Specifically, the IAB node 10B may utilize a periodic timer. That is, when the periodic timer expires, the IAB node 10B may transmit the timing misalignment to the parent IAB node 10A. The periodic timer may be set by RRC signaling or may be predefined.

[0053] Furthermore, when the value of the timing misalignment between the MT-UL and DU-UL, the value of the timing misalignment between the MT-UL and DU-DL, the value of the timing misalignment between the MT-DL and DU-UL, or the value of the timing misalignment between the MT-DL and DU-DL changes, the timing misalignment value may be reported. Specifically, when the value of the timing misalignment between the MT-UL and DU-UL, the value of the timing misalignment between the MT-UL and DU-DL, the value of the timing misalignment between the MT-DL and DU-UL, or the value of the timing misalignment between the MT-DL and DU-DL changes by a threshold or more from the last reported value, the IAB node 10B may report the changed timing misalignment value to the parent IAB node 10A. For example, when one, some, or all of the timing misalignment values ​​between MT-UL and DU-UL, the timing misalignment value between MT-UL and DU-DL, the timing misalignment value between MT-DL and DU-UL, and the timing misalignment value between MT-DL and DU-DL change by more than a threshold, IAB node 10B may report the changed timing misalignment values ​​to its parent IAB node 10A.

[0054] The threshold may be set by RRC signaling or may be predefined, or may be zero, such that when the timing misalignment value at the IAB node 10B changes, the changed timing misalignment value is reported to the parent IAB node 10A.

[0055] In the above-described embodiment, the IAB node 10B and the parent IAB node 10A perform wireless communication via the NTN 30, but the present disclosure is not limited to this and can also be applied to a case where the UE 20 and the parent IAB node 10A perform wireless communication via the NTN 30. In this case, the UE 20 may report timing misalignment by the IAB node 10B to the gNB 10A via the NTN 30.

[0056] Example 3 In the second and third embodiments, an IAB node 10B that wirelessly communicates with a parent IAB node 10A by IAB via an NTN transmits resource overlap information between a backhaul link with the parent IAB node 10A and an access link with a UE 20. In the third embodiment, when the IAB node 10B reports to the parent IAB node 10A the number of guard symbols unused by the MT 102 in a slot transitioning between the MT 102 and the DU 103 of the IAB node 10B, the range of the number of guard symbols may be expanded from that in Release 16 / 17. For example, the range of the number of guard symbols may be set to 0 to X (where X is an integer between 4 and 14). This makes it possible to specify the number of guard symbols for a longer period.

[0057] The reporting of the number of guard symbols may also be event-triggered. For example, the IAB node 10B may periodically transmit the number of guard symbols to the parent IAB node 10A. Specifically, the IAB node 10B may use a periodic timer. That is, when the periodic timer expires, the IAB node 10B may transmit the number of guard symbols to the parent IAB node 10A. The periodic timer may be set by RRC signaling or may be predefined.

[0058] Additionally, when the number of guard symbols changes, the number of guard symbols may be reported. Specifically, when the number of guard symbols has changed by a threshold or more from the most recently reported value, the IAB node 10B may report the changed number of guard symbols to the parent IAB node 10A.

[0059] The threshold may be set by RRC signaling or may be predefined, or may be zero, and when the number of guard symbols in the IAB node 10B changes, the changed number of guard symbols may be reported to the parent IAB node 10A.

[0060] In addition, when the number of guard symbols for one, some, or all of the following scenarios changes by more than a threshold: switching between MT102 transmission (MT-Tx) and DU103 transmission (DU-Tx), switching between MT102 transmission (MT-Tx) and DU103 reception (DU-Rx), switching between MT102 reception (MT-Rx) and DU103 transmission (DU-Tx), and switching between MT102 reception (MT-Rx) and DU103 reception (DU-Rx), the IAB node 10B may report the changed number of guard symbols to the parent IAB node 10A.

[0061] Note that a change in the number of guard symbols occurs when the propagation delay between the IAB node 10B and the parent IAB node 10A changes, when the IAB node 10B or the parent IAB node 10A moves, etc. Therefore, when the propagation delay between the IAB node 10B and the parent IAB node 10A changes, or when the IAB node 10B or the parent IAB node 10A moves, the IAB node 10B may report the number of guard symbols to the parent IAB node 10A.

[0062] In the above-described embodiment, the IAB node 10B and the parent IAB node 10A perform wireless communication via the NTN 30, but the present disclosure is not limited to this and can also be applied to a case where the UE 20 and the parent IAB node 10A perform wireless communication via the NTN 30. In this case, the UE 20 may report the number of guard symbols to the gNB 10A via the NTN 30 by the IAB node 10B described above.

[0063] <Combination of Examples> This embodiment can be combined with the above-described embodiments 1 to 3. In embodiment 3, the number of guard symbols is reported in symbol units, but the present disclosure is not limited to this. For example, the range of the number of guard symbols may be in units of multiple symbols, slots, slots, subframes, or subframes. Alternatively, the range may be in units of frames, frames, milliseconds, or milliseconds.

[0064] The number of guard symbols may also be reported in a combination of any two or more of these units. For example, if N1 and N2 are two reported values ​​and G1 and G2 are two predetermined granularities, the number of guard symbols may be expressed as N1*G1+N2*G2, where G1 is the slot unit and G2 is the symbol unit. When IAB node 10B reports values ​​of N1 and N2, parent IAB node 10A may determine that the number of guard symbols corresponds to a period of N1 slots + N2 symbols.

[0065] Similarly, for example, if N1, N2, and N3 are three reported values ​​and G1, G2, and G3 are three predetermined granularities, the number of guard symbols may be represented by N1*G1+N2*G2+N3*G3, where G1 is the frame unit, G2 is the slot unit, and G3 is the symbol unit. If IAB node 10B reports values ​​for N1, N2, and N3, parent IAB node 10A may determine that the number of guard symbols corresponds to a period of N1 frames + N2 slots + N3 symbols.

[0066] In addition, in the third embodiment, the IAB node 10B may report to the parent IAB node 10A a symbol-level misalignment indicating an overlapping symbol Y between the receiving subframe i+X of the MT 102 and the transmitting subframe i of the DU 103. At this time, in the second embodiment, the IAB node 10B may report both a misalignment at the frame, subframe, slot, or millisecond level and a misalignment at the symbol level to the parent IAB node 10A. For example, the IAB node 10B may report a combination of X subframes and Y symbols.

[0067] In addition, in the third embodiment, the IAB node 10B may report to the parent IAB node 10A a symbol-level misalignment indicating an overlapping symbol Y between the receiving subframe i+X of the MT 102 and the transmitting subframe i of the DU 103. At this time, in the second embodiment, the IAB node 10B may report only a frame-, subframe-, slot-, or millisecond-level misalignment to the parent IAB node 10A without reporting the symbol-level misalignment. For example, the IAB node 10B may report the X subframe.

[0068] Furthermore, the timing misalignment between MT102 transmission and DU103 transmission, the timing misalignment between MT102 transmission and DU103 reception, the timing misalignment between MT102 reception and DU103 transmission, or the timing misalignment between MT102 reception and DU103 reception may be determined by the sum of the number of guard symbols and an offset, where the number of guard symbols may be reported according to Example 3 or Release 16 or 17.

[0069] Alternatively, the offset may be reported by the IAB node 10B, or may be set or notified by the parent IAB node 10A. T TA =(N TA +N TA, UE-specific +N TA, common +N TA, offset )×T c T in (2) TA Alternatively, the offset may be determined from the value of T in equation (2). TA N used to calculate TA , N TA,UE-specific , N TA,common and N TA,offset The value of the parameter may be determined from one or more values ​​of the parameters including:

[0070] The offset granularity is T c Units, plural T cUnits, symbol units, multiple-symbol units, slot units, multiple-slot units, subframe units, multiple-subframe units. It may also be a frame unit, multiple-frame units, millisecond units, multiple-millisecond units, etc.

[0071] Also, the offset of timing misalignment between MT-UL and DU-UL, the offset of timing misalignment between MT-UL and DU-DL, the offset of timing misalignment between MT-DL and DU-UL, or the offset of timing misalignment between MT-DL and DU-DL may be common or may be independent different values.

[0072] <IAB Node's Capability Information> Regarding IAB node 10, the following capability information can be defined: · Whether MT102 of IAB node 10 can be connected to NTN30 · Whether MT102 and DU103 of IAB node 10 can be time division multiplexing (TDM), frequency division multiplexing (FDM), or space division multiplexing (SDM) when connecting to NTN30 · Whether simultaneous MT-Tx / MT-Rx and DU-Tx / DU-Rx are supported when connecting to NTN30 · Whether IAB node 10 supports reporting the position of IAB node 10 (Example 1) · Whether IAB node 10 supports reporting "UE-specific TA" or "TA" (Example 1) · Whether IAB node 10 supports reporting the timing misalignment between MT-DL / MT-UL and DU-DL / DU-UL (Example 2) · Whether IAB node 10 supports extended guard symbols (Example 3) IAB node 10B may notify the above-mentioned capability information to the parent IAB node 10A via NTN30.

[0073] (Device Configuration) Next, a description will be given of an example of the functional configuration of the wireless communication node 10 and the terminal 20 that perform the processes and operations described above. The wireless communication node 10 and the terminal 20 include functions for performing the above-described embodiments. However, each of the wireless communication node 10 and the terminal 20 may be provided with only a part of the functions of the embodiments.

[0074] <Wireless communication node 10> Fig. 8 is a diagram showing an example of the functional configuration of the wireless communication node 10. As shown in Fig. 8, the wireless communication node 10 has a transmitting unit 11, a receiving unit 12, a setting unit 13, and a control unit 14. The functional configuration shown in Fig. 8 is merely an example. The functional divisions and names of the functional units may be any names as long as they can perform the operations according to the embodiment of the present invention.

[0075] The transmitter 11 has a function of generating a signal to be transmitted to the terminal 20 or another wireless communication node 10, and transmitting the signal by wire or wirelessly. The receiver 12 has a function of receiving various signals transmitted from the terminal 20 or another wireless communication node 10, and acquiring, for example, information of a higher layer from the received signal.

[0076] The setting unit 13 stores in a storage device setting information that is set in advance and various setting information to be transmitted to the terminal 20, and reads out the information from the storage device as needed. The content of the setting information may include, for example, various information for IAB.

[0077] As described in the embodiment, the control unit 14 controls wireless links with upper nodes via non-terrestrial nodes and wireless links with lower nodes for IAB via NTN 30. The control unit 14 also performs processing related to communication with the terminal 20. A functional unit related to signal transmission in the control unit 14 may be included in the transmitter 11, and a functional unit related to signal reception in the control unit 14 may be included in the receiver 12.

[0078] <Terminal 20> Fig. 9 is a diagram showing an example of the functional configuration of terminal 20. As shown in Fig. 9, terminal 20 has a transmitting unit 21, a receiving unit 22, a setting unit 23, and a control unit 24. The functional configuration shown in Fig. 9 is merely an example. The functional divisions and names of the functional units may be any names as long as they can perform the operations according to the embodiment of the present invention.

[0079] The transmitter 21 creates a transmission signal from transmission data and transmits the transmission signal wirelessly. The receiver 22 receives various signals wirelessly and acquires higher layer signals from the received physical layer signals. The receiver 22 also has a function of receiving NR-PSS, NR-SSS, NR-PBCH, DL / UL control signals, reference signals, etc. transmitted from the wireless communication node 10.

[0080] The setting unit 23 stores various setting information received from the wireless communication node 10 by the receiving unit 22 in a storage device and reads it out from the storage device as needed. The setting unit 23 also stores setting information that is set in advance. The content of the setting information may include, for example, various information for IAB.

[0081] As described in the embodiment, the control unit 24 controls the wireless link with the upper node via the non-terrestrial node and the wireless link with the lower node for IAB via the NTN 30. The function unit related to signal transmission in the control unit 24 may be included in the transmitting unit 21, and the function unit related to signal reception in the control unit 24 may be included in the receiving unit 22.

[0082] (Hardware configuration) The block diagrams used to explain the above embodiments show functional blocks. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method for realizing each functional block is not particularly limited. That is, each functional block may be realized using a single device that is physically or logically coupled, or may be realized using two or more physically or logically separated devices that are directly or indirectly connected (for example, using wires, wirelessly, etc.) and these multiple devices. The functional block may also be realized by combining the single device or multiple devices with software.

[0083] Functions include, but are not limited to, judgment, determination, judgment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, election, establishment, comparison, assumption, expectation, consideration, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocation, mapping, and assignment. For example, a functional block (component) that performs transmission is called a transmitting unit or transmitter. As mentioned above, there are no particular limitations on how these functions are implemented.

[0084] For example, an IAB node, a terminal, or the like according to an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 10 is a diagram illustrating an example of the hardware configuration of an IAB node and a terminal according to an embodiment of the present disclosure. The above-described IAB node 10 and terminal 20 may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like.

[0085] In the following description, the term "device" can be interpreted as a circuit, a device, a unit, etc. The hardware configuration of the IAB node 10 and the terminal 20 may be configured to include one or more of the devices shown in the figure, or may be configured to exclude some of the devices.

[0086] Each function in the IAB node 10 and the terminal 20 is realized by loading specified software (programs) onto hardware such as the processor 1001 and memory 1002, causing the processor 1001 to perform calculations, control communication by the communication device 1004, and control at least one of reading and writing data in the memory 1002 and storage 1003.

[0087] The processor 1001 controls the entire computer by running, for example, an operating system. The processor 1001 may be configured by a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, a register, etc. For example, the above-mentioned control unit 100, MT 102, DU 103, etc. may be realized by the processor 1001.

[0088] Furthermore, the processor 1001 reads programs (program codes), software modules, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and executes various processes in accordance with these. The programs used are those that cause a computer to execute at least some of the operations described in the above-described embodiments. For example, the control unit of the terminal 20 may be implemented by a control program stored in the memory 1002 and running on the processor 1001, and similar implementations may be made for other functional blocks. While the above-described various processes have been described as being executed by one processor 1001, they may also be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 may be implemented by one or more chips. The programs may be transmitted from a network via a telecommunications line.

[0089] The memory 1002 is a computer-readable recording medium and may be configured, for example, by at least one of a read-only memory (ROM), an erasable programmable ROM (EPROM), an electrically erasable programmable ROM (EEPROM), a random access memory (RAM), etc. The memory 1002 may also be called a register, a cache, a main memory (primary storage device), etc. The memory 1002 can store executable programs (program codes), software modules, etc. for implementing a wireless communication method according to an embodiment of the present disclosure.

[0090] Storage 1003 is a computer-readable recording medium, and may be composed of at least one of, for example, an optical disk such as a CD-ROM (Compact Disc ROM), a hard disk drive, a flexible disk, a magneto-optical disk (e.g., a compact disk, a digital versatile disk, a Blu-ray disc), a smart card, a flash memory (e.g., a card, a stick, a key drive), a floppy disk, a magnetic strip, etc. Storage 1003 may also be referred to as an auxiliary storage device. The above-mentioned storage medium may be, for example, a database, a server, or other appropriate medium including at least one of memory 1002 and storage 1003.

[0091] The communication device 1004 is hardware (transmission / reception device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, or a communication module. The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. to realize at least one of frequency division duplex (FDD) and time division duplex (TDD). For example, the antennas provided in the IAB node 10 and the terminal 20 may be realized by the communication device 1004.

[0092] The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that receives input from the outside. The output device 1006 is an output device (for example, a display, a speaker, an LED lamp, etc.) that outputs to the outside. The input device 1005 and the output device 1006 may be integrated into one device (for example, a touch panel).

[0093] Furthermore, 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 between each device.

[0094] Furthermore, 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. Furthermore, 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.

[0095] (Summary of the embodiment) As described above, according to an embodiment of the present invention, there is provided a wireless communication node having a control unit that controls a first wireless link with an upper node via a non-terrestrial node and a second wireless link with a lower node, and a transmission unit that transmits uplink transmission timing information for the first wireless link to the upper node.

[0096] According to the above configuration, in wireless communication by IAB via a non-terrestrial network, an IAB node can report uplink transmission timing even when there is a large difference between the transmission and reception timing of the MT and the transmission and reception timing of the DU.

[0097] In one embodiment, the uplink transmission timing information may include location information of the wireless communication node, which allows for the calculation of propagation delays between the parent IAB node and the IAB node.

[0098] The uplink transmission timing information may include timing advance related information. According to this embodiment, the uplink transmission timing by the IAB node can be configured and reported.

[0099] According to another embodiment of the present invention, there is provided a wireless communication node having a control unit that controls a first wireless link with an upper node via a non-terrestrial node and a second wireless link with a lower node, and a transmission unit that transmits resource overlap information between the first wireless link and the second wireless link to the upper node.

[0100] According to the above configuration, in wireless communication by IAB via a non-terrestrial network, an IAB node can report overlapping resources between an MT and a DU even if there is a large difference between the transmission and reception timing of the MT and the transmission and reception timing of the DU.

[0101] In one embodiment, the resource overlap information may indicate overlapping resources by a first time unit and a second time unit that is longer than the first time unit, thereby enabling reporting of longer time periods using multiple time units.

[0102] According to another embodiment of the present invention, there is provided a wireless communication method comprising the steps of controlling a first wireless link with an upper node via a non-terrestrial node and a second wireless link with a lower node, and transmitting uplink transmission timing information for the first wireless link to the upper node.

[0103] According to the above configuration, in wireless communication by IAB via a non-terrestrial network, an IAB node can report uplink transmission timing even when there is a large difference between the transmission and reception timing of the MT and the transmission and reception timing of the DU.

[0104] (Supplementary explanation of the embodiment) Although the embodiments of the present invention have been described above, the disclosed invention is not limited to such embodiments, and those skilled in the art will understand various modifications, alterations, alternatives, and substitutions. While specific numerical examples have been used to facilitate understanding of the invention, unless otherwise specified, these numerical values ​​are merely examples, and any appropriate values ​​may be used. The division of items in the above description is not essential to the present invention; features described in two or more items may be used in combination as needed, and features described in one item may apply to features described in another item (unless inconsistent). The boundaries between functional units or processing units in the functional block diagram do not necessarily correspond to the boundaries between physical components. The operations of multiple functional units may be performed by a single physical component, or the operations of a single functional unit may be performed by multiple physical components. The order of the processing steps described in the embodiments may be reversed as long as there is no contradiction. For convenience of processing description, the wireless communication node 10 and the terminal 20 have been described using functional block diagrams. However, such devices may be implemented using hardware, software, or a combination thereof. The software operated by the processor of the wireless communication node 10 according to an embodiment of the present invention and the software operated by the processor of the terminal 20 according to an embodiment of the present invention may each be stored in random access memory (RAM), flash memory, read-only memory (ROM), EPROM, EEPROM, registers, hard disk (HDD), removable disk, CD-ROM, database, server or any other suitable storage medium.

[0105] (Information notification, signaling) The notification of information is not limited to the aspects / embodiments described in the present disclosure and may be performed using other methods. For example, the notification of information may be performed by physical layer signaling (e.g., Downlink Control Information (DCI) and Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, and broadcast information (Master Information Block (MIB) and System Information Block (SIB))), other signals, or a combination thereof. Furthermore, the RRC signaling may be referred to as an RRC message, and may be, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, or the like.

[0106] (Applicable system) Each aspect / embodiment described in the present disclosure may be applied to at least one of systems using LTE (Long Term Evolution), LTE-Advanced (LTE-A), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system), FRA (Future Radio Access), NR (New Radio), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark), IEEE 802.20, UWB (Ultra-Wideband), Bluetooth (registered trademark), or other appropriate systems, and next-generation systems extended based on these. Furthermore, a combination of multiple systems (e.g., a combination of at least one of LTE and LTE-A with 5G) may also be applied.

[0107] (Processing procedures, etc.) The order of the procedures, sequences, flowcharts, etc. of each aspect / embodiment described in this disclosure may be changed unless it is consistent. For example, the methods described in this disclosure present elements of various steps using an example order, and are not limited to the particular order presented.

[0108] (IAB node operation) In the present disclosure, a specific operation described as being performed by an IAB node may also be performed by its upper node in some cases. In a network consisting of one or more network nodes having an IAB node, it is clear that various operations performed for communication with a terminal may be performed by at least one of the IAB node and another network node other than the IAB node (for example, but not limited to, an MME or an S-GW). Although the above example illustrates a case where there is one other network node other than the IAB node, a combination of multiple other network nodes (for example, an MME and an S-GW) may also be used.

[0109] (input / output direction) Information, etc. (See the "Information, Signals" section) can be output from a higher layer (or a lower layer) to a lower layer (or a higher layer). It can also be input / output via multiple network nodes.

[0110] (Handling of input and output information, etc.) Input and output information may be stored in a specific location (for example, memory) or may be managed using a management table. Input and output information may be overwritten, updated, or added to. Output information may be deleted. Input information may be sent to another device.

[0111] (Judgment method) The determination may be made based on a value represented by one bit (0 or 1), a Boolean value (true or false), or a numerical comparison (e.g., comparison with a predetermined value).

[0112] (software) Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

[0113] Software, instructions, information, etc. may also be transmitted or received over a transmission medium. For example, if software is transmitted from a website, server, or other remote source using wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), and / or wireless technologies (such as infrared, microwave), then these wired and / or wireless technologies are included within the definition of transmission media.

[0114] (information, signals) The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0115] Note that terms explained in this disclosure and terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, at least one of a channel and a symbol may be a signal (signaling). Furthermore, a signal may be a message. Furthermore, a component carrier (CC) may be called a carrier frequency, a cell, a frequency carrier, etc.

[0116] ("System", "Network") As used in this disclosure, the terms "system" and "network" are used interchangeably.

[0117] (parameter, channel name) Furthermore, the information, parameters, etc. described in the present disclosure may be expressed using absolute values, relative values ​​from a predetermined value, or other corresponding information. For example, a radio resource may be indicated by an index.

[0118] The names used for the above-described parameters are not intended to be limiting in any way. Furthermore, the mathematical expressions using these parameters may differ from those explicitly disclosed in this disclosure. The various channels (e.g., PUCCH, PDCCH, etc.) and information elements may be identified by any suitable names, and therefore the various names assigned to these various channels and information elements are not intended to be limiting in any way.

[0119] (Base station (wireless base station)) In this disclosure, an IAB node has the functionality of a base station. 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. A base station may also be referred to by terms such as a macrocell, small cell, femtocell, and picocell.

[0120] A base station can accommodate one or more (e.g., three) 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 be provided with communication service by a base station subsystem (e.g., a small indoor base station (RRH: Remote Radio Head)). The term "cell" or "sector" refers to a part or the entire coverage area of ​​a base station and / or base station subsystem that provides communication service within this coverage.

[0121] (Terminal) In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," etc. may be used interchangeably.

[0122] A mobile station may also be referred to by those skilled in the art as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable terminology.

[0123] (IAB node / mobile station) At least one of the IAB node and the mobile station may be referred to as a transmitting device, a receiving device, a communication device, etc. At least one of the IAB node and the mobile station may be a device mounted on a mobile object, the mobile object itself, etc. The mobile object may be a vehicle (e.g., a car, an airplane, etc.), an unmanned mobile object (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). At least one of the IAB node and the mobile station may also include devices that do not necessarily move during communication operations. For example, at least one of the IAB node and the mobile station may be an IoT (Internet of Things) device such as a sensor.

[0124] Furthermore, the IAB node in the present disclosure may be read as a user terminal. For example, the aspects / embodiments of the present disclosure may be applied to a configuration in which communication between an IAB node and a user terminal is replaced with communication between multiple user terminals (which may be called, for example, D2D (Device-to-Device) or V2X (Vehicle-to-Everything)). In this case, the terminal 20 may be configured to have the functions of the IAB node 10 described above. Furthermore, terms such as "uplink" and "downlink" may be read as terms corresponding to terminal-to-terminal communication (for example, "side"). For example, terms such as an uplink channel and a downlink channel may be read as a side channel.

[0125] Similarly, the term "terminal" in the present disclosure may be read as "IAB node." In this case, the IAB node 10 may be configured to have the functions of the terminal 20 described above.

[0126] (Term meaning and interpretation) As used in this disclosure, the terms "determining" and "determining" may encompass a wide variety of actions. "Determining" and "determining" may include, for example, judging, calculating, computing, processing, deriving, investigating, looking up, searching, inquiring (e.g., searching in a table, database, or other data structure), ascertaining, and the like. "Determining" and "determining" may also include receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in memory), and the like. Furthermore, "judgment" and "decision" can include regarding resolving, selecting, choosing, establishing, comparing, etc. as having been "judged" or "decided." In other words, "judgment" and "decision" can include regarding some action as having been "judged" or "decided." Furthermore, "judgment (decision)" can be interpreted as "assuming," "expecting," "considering," etc.

[0127] The terms "connected," "coupled," or any variation thereof, refer to any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, "connected" may be read as "access." As used in this disclosure, two elements may be considered to be "connected" or "coupled" to each other using one or more wires, cables, and / or printed electrical connections, as well as electromagnetic energy having wavelengths in the radio frequency range, microwave range, and optical (both visible and invisible) range, as some non-limiting and non-exhaustive examples.

[0128] (reference signal) The reference signal may be abbreviated as RS (Reference Signal) or may be called a pilot depending on the applicable standard.

[0129] (meaning "based on") As used in this disclosure, the phrase "based on" does not mean "based only on," unless expressly stated otherwise. In other words, the phrase "based on" means both "based only on" and "based at least on."

[0130] ("First", "Second") As used in this disclosure, any reference to an element using a designation such as "first," "second," etc. does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, a reference to a first and a second element does not imply that only two elements may be employed or that the first element must in some way precede the second element.

[0131] (means) The "unit" in the configuration of each of the above devices may be replaced with "means," "circuit," "device," etc.

[0132] (open format) When used in this disclosure, the terms "include," "including," and variations thereof are intended to be inclusive, similar to the term "comprising." Furthermore, when used in this disclosure, the term "or" is not intended to be an exclusive or.

[0133] (Time units such as TTI, frequency units such as RB, radio frame structure) A radio frame may be composed of one or more frames in the time domain. Each of the one or more frames in the time domain may be called a subframe. A subframe may further be composed of one or more slots in the time domain. A subframe may have a fixed time length (e.g., 1 ms) that is independent of numerology.

[0134] Numerology may be a communication parameter applied to at least one of transmission and reception of a signal or channel, and 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, radio frame structure, specific filtering operations performed by a transceiver in the frequency domain, and specific windowing operations performed by a transceiver in the time domain.

[0135] A slot may be composed of one or more symbols (such as an Orthogonal Frequency Division Multiplexing (OFDM) symbol or a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol) in the time domain. A slot may be a time unit based on numerology.

[0136] A slot may include multiple minislots. Each minislot may consist of one or multiple symbols in the time domain. A minislot may also be called a subslot. A minislot may consist of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a minislot may be called PDSCH (or PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a minislot may be called PDSCH (or PUSCH) mapping type B.

[0137] The radio frame, subframe, slot, minislot, and symbol all represent time units for transmitting signals, and may be referred to by other names corresponding to the radio frame, subframe, slot, minislot, and symbol.

[0138] For example, one subframe may be called a transmission time interval (TTI), multiple consecutive subframes may be called a TTI, or one slot or one minislot may be called a TTI. That is, at least one of the subframe and the TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (for example, 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.

[0139] Here, TTI refers to, for example, the smallest time unit for scheduling in wireless communication. For example, in an LTE system, an IAB node performs scheduling to allocate radio resources (such as frequency bandwidth and transmission power that can be used by each user terminal) to each user terminal in TTI units. Note that the definition of TTI is not limited to this.

[0140] The TTI may be a transmission time unit for a channel-encoded data packet (transport block), a code block, a code word, etc., or may be a processing unit for scheduling, link adaptation, etc. When a TTI is given, the time interval (e.g., the number of symbols) to which a transport block, a code block, a code word, etc. is actually mapped may be shorter than the TTI.

[0141] When one slot or one minislot is called a TTI, one or more TTIs (i.e., one or more slots or one or more minislots) may be the minimum time unit for scheduling. Also, the number of slots (minislots) constituting the minimum time unit for scheduling may be controlled.

[0142] A TTI having a time length of 1 ms may be called a regular TTI (TTI in LTE Rel. 8-12), normal TTI, long TTI, regular subframe, normal subframe, long subframe, slot, etc. A TTI shorter than a regular TTI may be called a shortened TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, minislot, subslot, slot, etc.

[0143] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length of more than 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be interpreted as a TTI having a TTI length shorter than the TTI length of a long TTI and equal to or greater than 1 ms.

[0144] A resource block (RB) is a resource allocation unit in the time domain and frequency domain, and may include one or more consecutive subcarriers in the frequency domain. The number of subcarriers included in an RB may be the same regardless of numerology, for example, 12. The number of subcarriers included in an RB may also be determined based on numerology.

[0145] The time domain of an RB may include one or more symbols and may have a length of one slot, one minislot, one subframe, or one TTI. One TTI, one subframe, etc. may each be composed of one or more resource blocks.

[0146] Note that one or more RBs may also be called a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, or the like.

[0147] Furthermore, a resource block may be composed of one or more resource elements (REs). For example, one RE may be a radio resource region of one subcarrier and one symbol.

[0148] A Bandwidth Part (BWP) (which may also be referred to as a fractional bandwidth) may represent a subset of contiguous common resource blocks (RBs) for a given numerology on a given carrier, where the common RBs may be identified by their index relative to a common reference point of the carrier. PRBs may be defined in a given BWP and numbered within that BWP.

[0149] The BWP may include a BWP for UL (UL BWP) and a BWP for DL ​​(DL BWP). One or more BWPs may be configured for a terminal within one carrier.

[0150] At least one of the configured BWPs may be active, and the terminal may not expect to transmit or receive a predetermined signal / channel outside the active BWP. Note that the terms "cell," "carrier," etc. in this disclosure may be read as "BWP."

[0151] The above-described structures of radio frames, subframes, slots, minislots, symbols, etc. are merely examples. For example, the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the cyclic prefix (CP) length, etc. may be changed in various ways.

[0152] In this disclosure, where articles are added by translation, such as a, an, and the in English, the disclosure may include that the nouns following these articles are in the plural form.

[0153] In the present disclosure, the term "A and B are different" may mean "A and B are different from each other." The term may also mean "A and B are each different from C." Terms such as "separate" and "coupled" may also be interpreted in the same way as "different."

[0154] (Variations of form, etc.) Each aspect / embodiment described in this disclosure may be used alone, in combination, or switched depending on the implementation. Furthermore, notification of predetermined information (e.g., notification that "X is true") is not limited to being done explicitly, but may be done implicitly (e.g., by not notifying the predetermined information).

[0155] Although the present disclosure has been described in detail above, it is clear to those skilled in the art that the present disclosure is not limited to the embodiments described herein. The present disclosure can be implemented in modified and altered forms without departing from the spirit and scope of the present disclosure as defined by the claims. Therefore, the description of the present disclosure is intended to be illustrative and does not have any limiting meaning on the present disclosure. [Explanation of symbols]

[0156] 10, 10A, 10B, 10C IAB nodes 20 terminals 100 control section 102 MT (Mobile Termination) 103 DU (Distributed Unit)

Claims

1. a control unit that controls a first wireless link with an upper node via a non-terrestrial node and a second wireless link with a lower node; a transmitter that transmits resource overlap information between the first wireless link and the second wireless link to the upper node; and the resource overlap information indicates overlapping resources by a first time unit and a second time unit longer than the first time unit; Wireless communication node.

2. A wireless communication node, controlling a first wireless link with a higher-level node via a non-terrestrial node and a second wireless link with a lower-level node; transmitting resource overlap information between the first wireless link and the second wireless link to the upper node; and the resource overlap information indicates overlapping resources by a first time unit and a second time unit longer than the first time unit; Wireless communication method.

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