Wireless communication nodes

Abstract

The wireless communication node (100B) includes: a cell information acquisition unit (165) that acquires a set subcarrier spacing and a used frequency range; and a control unit (170) that sets a reference additional time included in a time difference from transmission in a serving cell to reception in a wireless communication node and a granularity applied to the reference additional time based on the subcarrier spacing and the frequency range.

Description

Technical Field

[0001] The present invention relates to wireless communication nodes for setting up wireless access and wireless backhaul. Background Art

[0002] In the 3rd Generation Partnership Project (3GPP), Long Term Evolution (LTE) was standardized, and with the aim of further speeding up LTE, standardization of LTE-Advanced (hereinafter referred to as LTE including LTE-Advanced) and the fifth generation mobile communication system (also known as 5G, New Radio (NR) or Next Generation (NG)) were also carried out.

[0003] For example, 3GPP version 16 stipulates that in the NR radio access network (RAN), integrated access and backhaul (IAB) is supported, which integrates radio access to terminals (User Equipment: UE) and radio backhaul between wireless communication nodes such as radio base stations (gNBs) (see non-patent document 1).

[0004] In IAB, an IAB node has a mobile terminal (MT) functioning to connect to a parent node (also called an IAB donor) and a distributed unit (DU) functioning to connect to a child node or UE.

[0005] In addition, in Release 16 of 3GPP, an additional time (T delta ) etc. (refer to non-patent document 2).

[0006] In addition, it also proposed to notify T delta A scheme for the control element (CE) of the medium access control layer (MAC) with an index (0, 1, 2, ..., 1199) (refer to non-patent document 3).

[0007] Prior art literature

[0008] Non-patent literature

[0009] Non-Patent Document 1: 3GPP TS 23.501 V16.3.0, 3rd Generation Partnership Project; Technical Specification Group Services and System Aspects; System architecture for the 5G System (5GS); Stage 2 (Release 16), 3GPP, December 2019

[0010] Non-Patent Document 2: 3GPP TS 38.213 V16.0.0, 3rd Generation Partnership Project; Technical Specification Group Radio Access Network; NR; Physical layer procedures for control (Release 16), 3GPP, December 2019

[0011] Non-Patent Document 3: “Introduction of Integrated Access and Backhaul for NR,” R2-2002405, 3GPP TSG-RAN WG2 Meeting #109-e, 3GPP, February 2020 Summary of the Invention

[0012] However, appropriate T delta The value varies depending on the subcarrier spacing (SCS) set in the serving cell and the frequency range (FR) used in the serving cell.

[0013] Therefore, wireless communication nodes such as IAB nodes may not necessarily be able to assume appropriate T delta .

[0014] Therefore, the following disclosure is made in view of such a situation, and its purpose is to provide a method for always appropriately setting the additional time (T delta ) wireless communication node.

[0015] One embodiment of the present disclosure is a wireless communication node (wireless communication node 100B), which includes: an acquisition unit (cell information acquisition unit 165) that acquires a set subcarrier spacing and a frequency range used; and a control unit (control unit 170) that sets a reference additional time included in a time difference from transmission in a serving cell to reception in the wireless communication node and a granularity applied to the reference additional time based on the subcarrier spacing and the frequency range.

[0016] One embodiment of the present disclosure is a wireless communication node (wireless communication node 100B), which includes: a receiving unit (wireless receiving unit 162) that receives a control element "indicating an index of additional time included in the time difference from transmission in a serving cell to reception in the wireless communication node"; and a control unit (control unit 170) that sets the number of bits expressing the index based on at least either a set subcarrier spacing and a set frequency range.

[0017] One embodiment of the present disclosure is a wireless communication node (wireless communication node 100B), which includes: a receiving unit (wireless receiving unit 162) that receives a control element "including an index of an additional time included in a time difference from transmission in a serving cell to reception in the wireless communication node"; and a control unit (control unit 170) that sets the number of bits of the index to be read based on at least either a set subcarrier spacing and a frequency range.

[0018] One embodiment of the present disclosure is a wireless communication node (wireless communication node 100B), which includes: a receiving unit (wireless receiving unit 162) that receives a control element "including an index of an additional time included in a time difference from transmission in a serving cell to reception in the wireless communication node"; and a control unit (control unit 170) that sets the number of bits of the index to be read, regardless of the set subcarrier spacing and frequency range. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a diagram schematically illustrating the overall configuration of the wireless communication system 10 .

[0020] Figure 2 This is a diagram showing a basic configuration example of IAB.

[0021] Figure 3 FIG. 4 is a functional block diagram of the wireless communication node 100B.

[0022] Figure 4A It shows T delta A diagram showing a structural example of a MAC-CE (Part 1).

[0023] Figure 4B It shows T delta A diagram showing an example of the MAC-CE structure (Part 2).

[0024] Figure 5 100A to 100C is a diagram showing an example of the hardware configuration of the CU 50 and the wireless communication nodes 100A to 100C. DETAILED DESCRIPTION

[0025] Hereinafter, the embodiment will be described with reference to the accompanying drawings. In addition, the same or similar reference numerals are given to the same functions and structures, and their descriptions are omitted as appropriate.

[0026] (1) Overall schematic structure of wireless communication system

[0027] Figure 1 This is a diagram schematically illustrating the overall configuration of a wireless communication system 10 according to this embodiment. The wireless communication system 10 is a wireless communication system compliant with 5G New Radio (NR), and is composed of a plurality of wireless communication nodes and terminals.

[0028] Specifically, the wireless communication system 10 includes wireless communication nodes 100A, 100B, and 100C and a terminal 200 (hereinafter referred to as UE 200 or User Equipment).

[0029] The wireless communication nodes 100A, 100B, and 100C are capable of establishing wireless access with the UE 200 and establishing a wireless backhaul (BH) between the wireless communication nodes. Specifically, backhauls (links) based on wireless links are established between the wireless communication node 100A and the wireless communication node 100B, and between the wireless communication node 100A and the wireless communication node 100C.

[0030] In this way, a structure in which the radio access to the UE 200 and the radio backhaul between the radio communication nodes are integrated is called an integrated access and backhaul (IAB).

[0031] IAB reuses existing functions and interfaces defined for radio access. Specifically, the Mobile Terminal (MT), gNB-Distributed Unit (gNB-DU), gNB-Central Unit (gNB-CU), User Plane Function (UPF), Access and Mobility Management Function (AMF), and Session Management Function (SMF), along with corresponding interfaces such as NR Uu (between MT and gNB / DU), F1, NG, X2, and N4, are used as a baseline.

[0032] The wireless communication node 100A is connected to the NR radio access network (NG-RAN) and the core network (Next Generation Core (NGC) or 5GC) via a wired transmission path such as optical fiber. The NG-RAN / NGC includes a centralized unit 50 (CU 50), which serves as a communication node. The term "network" may also be used to refer to both the NG-RAN and NGC.

[0033] In addition, CU 50 may also be composed of any one or a combination of the above-mentioned UPF, AMF, and SMF. Alternatively, CU 50 may also be a gNB-CU as described above.

[0034] Figure 2 : is a diagram showing an example of the basic structure of IAB. Figure 2 As shown, in this embodiment, the wireless communication node 100A constitutes the parent node in the IAB, and the wireless communication node 100B (and the wireless communication node 100C) constitute the IAB node in the IAB. In addition, the parent node can also be called the IAB donor or the upper node.

[0035] The child node in IAB is composed of Figure 1 Alternatively, UE 200 may constitute a child node.

[0036] A wireless link is established between the parent node and the IAB node. Specifically, a wireless link called Link_parent is established.

[0037] A wireless link is established between the IAB node and the child node. Specifically, a wireless link called Link_child is established.

[0038] The wireless link established between these wireless communication nodes is called a wireless backhaul link. Link_parent consists of a downlink (DL) parent backhaul (DL Parent BH) and an uplink (UL) parent backhaul (UL Parent BH). Link_child consists of a DL child backhaul (DL Child BH) and an UL child backhaul (UL Child BH).

[0039] That is, in IAB, the direction from the parent node toward the child node (including the UE 200) is the DL direction, and the direction from the child node toward the parent node is the UL direction.

[0040] In addition, the radio link established between the UE 200 and the IAB node or the parent node is called a radio access link. Specifically, the radio link is composed of DL access (DL Access) in the DL direction and UL access (UL Access) in the UL direction.

[0041] An IAB node has a mobile terminal (MT) function for connecting to a parent node and a distributed unit (DU) function for connecting to a child node (or UE 200). A child node may also be referred to as a lower-level node.

[0042] Similarly, the parent node has an MT for connecting to an upper node and a DU for connecting to a lower node such as an IAB node. In addition, the parent node may have a CU (Central Unit) instead of an MT.

[0043] Furthermore, similarly to the IAB node and the parent node, the child node also has an MT for connecting to an upper node such as the IAB node and a DU for connecting to a lower node such as the UE 200 .

[0044] Regarding the radio resources used by DUs, DL, UL, and flexible time-resources (D / U / F) are classified as "Hard," "Soft," or "Not Available" (H / S / NA) based on the DU's perspective. Furthermore, within Soft (S), "Available" or "Not Available" is also specified.

[0045] in addition, Figure 2 The example IAB structure shown utilizes CU / DU splitting, but the IAB structure is not necessarily limited to this. For example, in wireless backhaul, the IAB can be constructed using tunnels using GPRS Tunneling Protocol-User Plane / User Datagram Protocol (GTP-U / UDP) / Internet Protocol (IP).

[0046] The main advantage of IAB is the ability to flexibly and densely deploy NR cells without densifying the transmission network. IAB can be applied to various scenarios, including outdoor small cell deployment, indoor deployment, and support for mobile relays (e.g., on buses and trains).

[0047] In addition, if Figure 1 and Figure 2 As shown, IAB can also support extensions based on standalone (SA) based on NR only or non-standalone (NSA) based on extensions including other RATs (LTE, etc.).

[0048] In this embodiment, wireless access and wireless backhaul operate based on half-duplex communication. However, this is not necessarily limited to half-duplex communication, and full-duplex communication is also possible as long as the requirements are met.

[0049] In addition, the multiplexing method can use time division multiplexing (TDM), space division multiplexing (SDM) and frequency division multiplexing (FDM).

[0050] When an IAB node operates in half-duplex communication, the DL Parent BH becomes the receive (RX) side, the UL Parent BH becomes the transmit (TX) side, the DL Child BH becomes the transmit (TX) side, and the UL Child BH becomes the receive (RX) side. Furthermore, in time division duplex (TDD), the DL / UL configuration mode at the IAB node is not limited to DL-F-UL; configurations such as wireless backhaul (BH) only and UL-F-DL can also be applied.

[0051] Furthermore, in Release 16 of 3GPP, in order to determine the DU transmission timing of the IAB node, (Equation 1) is defined as the time difference from when the DU is transmitted from the parent node to when it is received by the MT of the IAB node.

[0052] [Formula 1]

[0053] (N TA +N TA，offset )·T c / 2+T delta …(Equation 1)

[0054] Specifically, (Formula 1) is defined in Chapter 14 of 3GPP TS38.213 and Chapter 7.1.2 of TS38.133. TA Originally, it is the value of Timing Advance (TA) used to determine the transmission timing of the signal in the UL of UE 200 etc. TA The possible values are 0, 1, 2, ..., 3846.

[0055] N TA，offset It is stipulated in Chapter 7.1.2 of TS38.133, which is based on T c The value of the unit. N TA，offset It can differ depending on the frequency range (FR) and the communication method (TDD, Frequency Division Duplex (FDD: Frequency Division Duplex)).

[0056] The wireless communication system 10 corresponds to FR1 and FR2. The frequency bands of the respective FRs are as follows.

[0057] FR1: 410MHz~7.125GHz

[0058] FR2: 24.25GHz to 52.6GHz

[0059] In FR1, a subcarrier spacing (SCS) of 15, 30, or 60 kHz can be used, and a bandwidth (BW) of 5 to 100 MHz can be used. FR2 operates at a higher frequency than FR1, and an SCS of 60 or 120 kHz (including 240 kHz) can be used, and a bandwidth (BW) of 50 to 400 MHz can be used. Furthermore, the wireless communication system 10 can also support other FRs, such as higher frequency bands than FR2.

[0060] The wireless communication node (including UE 200) can set N according to the higher layer, specifically, according to the field n-TimingAdvanceOffset included in the information element (IE) of the radio resource control layer (RRC). TA，offset .

[0061] T cThis is the basic time unit in NR (5G) and is specified in Chapter 4.1 of 3GPP TS 38.211. Specifically, (Equation 2) is specified.

[0062] [Formula 2]

[0063] T c =1 / (Δf max ·N f )……(Formula 2)

[0064] (Δf max It is 480.10 3 Hz. In addition, N f is 4096. Therefore, T c It is 0.509ns.

[0065] T delta It can also be interpreted as the additional time added as the time difference specified by (Equation 1). delta It can also be appropriately expressed as T_delta.

[0066] As mentioned above, the time difference specified by (Equation 1) can also be defined as the time difference from when the DU is sent to when the MT is received. delta For example, it can be determined by considering the switching time from the parent node to the reception and transmission, and can also be a value of about half the switching time from the parent node to the reception and transmission. In addition, in this embodiment, as described later, T delta The value is mutable.

[0067] The IAB node can use the time difference specified by (Equation 1) to determine the transmission timing of the DU.

[0068] In addition, TA can be sent using a TA command in a random access response (RAR) or a control element (MAC-CE: Medium Access Control-Control Element) of the medium access control layer (MAC), but in this embodiment, a notification T is also used. delta MAC-CE.

[0069] Specifically, use the inclusion representation T delta The MAC-CE includes a field with an index (0, 1, 2, ..., 1199). In addition, the structure of the MAC-CE will be further described later.

[0070] (2) Functional block structure of wireless communication system

[0071] Next, the functional block configuration of the wireless communication node 100B constituting the wireless communication system 10 will be described.

[0072] Figure 3 FIG. 1 is a functional block diagram of a wireless communication node 100B constituting an IAB node. Figure 3 As shown, the wireless communication node 100B includes a wireless transmission unit 161 , a wireless reception unit 162 , a cell information acquisition unit 165 , and a control unit 170 .

[0073] The wireless transmission unit 161 transmits wireless signals compliant with 5G specifications. Furthermore, the wireless reception unit 162 transmits wireless signals compliant with 5G specifications. In this embodiment, the wireless transmission unit 161 and the wireless reception unit 162 perform wireless communications with the wireless communication node 100A, which constitutes the parent node, and with child nodes (including the UE 200).

[0074] Furthermore, the wireless reception unit 162 can receive a control element indicating an index of an additional time included in a time difference between transmission in the serving cell and reception in the wireless communication node 100B (IAB node). In this embodiment, the wireless reception unit 162 constitutes a reception unit.

[0075] Specifically, the wireless receiving unit 162 can receive T included in the above (Formula 1) in order to derive the time difference between the DU transmitted from the wireless communication node 100A (parent node) forming the serving cell and the MT receiving the DU at the IAB node. delta The index of the MAC-CE (also called T delta MAC-CE).

[0076] As mentioned above, the serving cell can be interpreted as the parent node (wireless communication node) of the IAB, or as a gNB (wireless base station). In addition, the serving cell can be simply interpreted as the cell to which the IAB node is connected, but more strictly speaking, in the case of an RRC_CONNECTED UE (wireless communication node) without carrier aggregation (CA), there is only one serving cell constituting the primary cell. In the case of an RRC_CONNECTED UE (wireless communication node) configured using CA, the serving cell can also be interpreted as representing a collection of one or more cells including the primary cell and all secondary cells.

[0077] The cell information acquisition unit 165 acquires information on a cell formed by a parent node, etc. In the present embodiment, the cell information acquisition unit 165 constitutes an acquisition unit.

[0078] Specifically, the cell information acquisition unit 165 can acquire the subcarrier spacing (SCS) set in the wireless signal transmitted and received in the cell. In addition, the cell information acquisition unit 165 can acquire the frequency range (FR) used in the serving cell.

[0079] Alternatively, the cell information acquisition unit 165 may receive downlink control information (DCI), for example, and acquire the aforementioned SCS and FR based on the received DCI. Information indicating the SCS and FR (frequency band) can also be interpreted as a bandwidth part (BWP). DCI can be transmitted from the network to an IAB node, etc., via the PDCCH (Physical Downlink Control Channel).

[0080] In addition, channels include control channels and data channels. Control channels include PDCCH (Physical Downlink Control Channel), PUCCH (Physical Uplink Control Channel), PRACH (Physical Random Access Channel), and PBCH (Physical Broadcast Channel).

[0081] In addition, data channels include PDSCH (Physical Downlink Shared Channel) and PUSCH (Physical Uplink Shared Channel).

[0082] Signals can include channels and reference signals. Reference signals include demodulation reference signals (DMRS), sounding reference signals (SRS), phase tracking reference signals (PTRS), and channel state information reference signals (CSI-RS). Furthermore, data can refer to data sent via a data channel.

[0083] The control unit 170 controls each functional block constituting the wireless communication node 100B. In particular, in this embodiment, the control unit 170 controls the aforementioned time difference (see (Equation 1)).

[0084] Specifically, the control unit 170 can set the reference additional time (referred to as T delta_o ) and applied to T delta_o More specifically, the control unit 170 can set the T included in the time difference from the transmission in the serving cell to the reception in the wireless communication node 100B according to the SCS and FR of the serving cell. delta_o , and set it to apply to T delta_o granularity.

[0085] The control unit 170 controls T delta_o At least one of and granularity can be set to a common value regardless of SCS and FR. delta_o At least either one of and granularity may be fixed and not changed according to SCS and FR.

[0086] More specifically, it is also possible to make T delta_o Fixed, only fixed granularity or T delta_o The granularity is common to both (fixed) and has nothing to do with SCS and FR.

[0087] In addition, the control unit 170 can set the expression T according to at least one of SCS and FR. delta Index of (T delta index) bits.

[0088] Specifically, the control unit 170 may delta In MAC-CE, 11 bits or 12 bits are set as the representation T delta The number of bits of the index. In addition, whether to set 11 bits or 12 bits can be predefined by the network or based on a notification from the network. The notification from the network can be low-level signaling such as DCI or high-level signaling such as RRC.

[0089] In addition, the control unit 170 may set the T to be read based on at least one of SCS and FR. delta The number of bits of index.

[0090] For example, even in T delta In MAC-CE, 11 bits are allocated to represent T delta In the case of the number of bits of index, the T to be read may be set based on at least one of SCS and FR. delta The number of bits of index is changed to 10 bits or 9 bits. delta An example of setting the number of bits of index will be described later.

[0091] Alternatively, the control unit 170 may set the T to be read regardless of SCS and FR. delta That is, the control unit 170 can make the T delta The number of bits of index (reading range) is constant (fixed) regardless of the settings of SCS and FR. For example, the control unit 170 may set the T delta The number of bits of the index is fixed at 11 bits.

[0092] (3) Operation of wireless communication system

[0093] Next, the operation of the wireless communication system 10 will be described. Specifically, the operation related to setting the time difference between the transmission of a DU from a parent node in the wireless communication system 10 and the reception of the MT by the IAB node will be described.

[0094] (3.1) Prerequisites

[0095] First, about T delta With T delta The mapping of index can be expressed as follows.

[0096] ·T delta_value =T delta_o +T delta index*granularity, or

[0097] ·T delta_value =T delta_o -T delta index*granularity

[0098] In addition, as mentioned above, T delta_value It can also refer to the time difference value (T delta value of ).

[0099] In addition, T delta_o (Base attachment time) and granularity may also be defined in advance according to 3GPP specifications.

[0100] (3.2) Action Overview

[0101] Next, appropriate T is set for the IAB node according to SCS and FR. delta The following describes the action.

[0102] (Action Example 1): T delta_o and granularity settings

[0103] (Alt. 1): Predefine T for each SCS, FR (e.g., FR1, FR2) or SCS and FR delta_o and granularity.

[0104] The IAB node sets T according to the SCS and FR of the serving cell. delta_o and granularity values.

[0105] (Alt.2): For T delta_o , predefine the value of each SCS,FR, and for granularity, predefine a common value regardless of SCS,FR.

[0106] The IAB node sets T according to the SCS and FR of the serving cell. delta_o value.

[0107] (Alt.3): For granularity, predefine the value of each SCS and FR, and for T delta_o , pre-define common values regardless of SCS and FR.

[0108] The IAB node sets the granularity value based on the SCS and FR of the serving cell.

[0109] (Alt.4): For T delta_o and granularity, pre-define common values regardless of SCS and FR.

[0110] In this case, T delta_o and granularity are unique values and are not related to the SCS and FR of the serving cell. delta index, requires 12 bits. Therefore, T delta Some reserved bits of MAC-CE.

[0111] (Action Example 2): T delta Setting the number of index bits (11 / 12 bits)

[0112] (Alt. 1): Change the number of bits for each SCS, FR, or SCS and FR.

[0113] (Alt.2): Set a constant number of bits regardless of SCS and FR.

[0114] In this case, the IAB node can also set the T corresponding to SCS and FR. delta The reading range of index.

[0115] (Alt.3): Number of bits and T based on IAB nodes delta The index reading range is fixed and has nothing to do with SCS and FR.

[0116] (3.3) Action Example 1

[0117] As mentioned above, in the case of (Alt.1), T delta_o and granularity are predefined for each SCS, FR, or SCS and FR. delta_o It can be SCS units, granularity can be FR units, or any combination.

[0118] The IAB node can also apply T according to the SCS, FR, or SCS and FR of the serving cell. delta_o and granularity.

[0119] Table 1 shows the T following (Alt.1) delta_o and granularity settings.

[0120] [Table 1]

[0121]

[0122] In the case of Table 1, T delta_o Based on the minimum value, T delta_value It can also be calculated as follows.

[0123] ·T delta_value =T delta_o +T delta index*granularity

[0124] In addition, the values in Table 1 (T delta_o and granularity) is just an example, and other values can also be set.

[0125] Table 2 shows other T delta_oand granularity settings.

[0126] [Table 2]

[0127]

[0128] In the case of Table 2, T delta_o Based on the maximum value, T delta_value It can also be calculated as follows.

[0129] ·T delta_value =T delta_o -T delta index*granularity

[0130] The values in Table 2 (T delta_o and granularity) is just an example, and other values can also be set.

[0131] Furthermore, as mentioned above, in the case of (Alt.2), for T delta_o , pre-define the value of each SCS, FR, and for granularity, pre-define a common value regardless of SCS, FR. In this case, the IAB node sets T according to the SCS, FR of the serving cell or according to the SCS and FR. delta_o The value of .

[0132] For example, as in the example of (Alt.1), granularity can also be predefined as 32*T c In addition, for T delta_o and granularity, other values can also be set.

[0133] In addition, as described above, in the case of (Alt.3), for granularity, the value of each SCS and FR is predefined, and for T delta_o , a common value is predefined regardless of the SCS and FR. In this case, the IAB node sets the granularity value based on the SCS and FR of the serving cell, or based on the SCS and FR.

[0134] For example, as in the example (Alt.1), T delta_o It can be set as follows.

[0135] ·T delta_o =N TA,offset / 2-70528、T delta_value =T delta_o -T delta index*granularity, or

[0136] ·T delta_o =N TA,offset / 2+6256、T delta_value =T delta_o -T delta index*granularity

[0137] In addition, for T delta_o and granularity, other values can also be set.

[0138] Furthermore, as mentioned above, in the case of (Alt.4), for T delta_o and granularity, pre-defined common values regardless of SCS and FR. In (Alt.4), it becomes T that targets all SCS and FR. delta MAC-CE T delta index and T delta_value The integrated mapping.

[0139] In the case of (Alt.4), in order to display all T delta index, requiring 12 bits.

[0140] Figure 4A Show T delta MAC-CE structure example (Part 1) Figure 4B Show T delta Example of MAC-CE structure (Part 2).

[0141] T delta The configuration example of MAC-CE (Part 1) is similar to the T-type configuration example shown in Non-Patent Document 3 (R2-2002405). delta The structure of MAC-CE is the same. Figure 4A As shown, 3 bits of octet 1 and 8 bits (all bits) of octet 2 (Oct 2) are allocated as T delta index.

[0142] On the other hand, Figure 4B In order to make it 12 bits, 1 bit of the reserved bit (R) of octet 1 is added.

[0143] In the case of (Alt.4), as in (Alt.3), T delta_o It can be set as follows.

[0144] ·T delta_o =N TA,offset / 2-70528、T delta_value =T delta_o -Tdelta index*granularity, or

[0145] ·T delta_o =N TA,offset / 2+6256、T delta_value =T delta_o -T delta index*granularity

[0146] In addition, similar to (Alt.2), granularity can also be predefined as 32*T c In addition, in T delta_o Other values can also be set in and granularity.

[0147] (3.4) Action Example 2

[0148] As explained in Operation Example 1, T delta MAC-CE (refer to Figure 4A and Figure 4B ) of T delta The length (number of bits) of the bit field of index can be 11 bits, 12 bits, or other values (for example, 10 bits).

[0149] Here, the IAB node determines T delta The value of index (can also be replaced by T delta_value ) and the number of bits that are meaningful (i.e., necessary), and the T delta The range of the index can be changed according to the SCS, FR, or SCS and FR of the serving cell.

[0150] When considering that the IAB node is in order to decide T delta The value of index and the number of bits with significance and T delta As for the allowable range of index, there are options from (Alt.1) to (Alt.3) as described above.

[0151] In the case of (Alt.1), the meaningful T delta The number of index bits can be changed for each SCS, FR, or SCS and FR. delta The allowable range of index can also be changed according to each SCS, FR, or SCS and FR. In addition, the number of bits varies according to each SCS, the allowable range varies according to each FR, etc. The number of bits, allowable range, SCS, and FR can also be arbitrarily combined.

[0152] In the case of (Alt.1), the IAB node follows the SCS, FR, or SCS and FR of the serving cell to determine the meaningful T delta The number of bits of index.

[0153] Table 3 shows the meaningful T following (Alt.1) delta The number of bits of index and T delta This is an example of setting the allowable range of index.

[0154] [Table 3]

[0155]

[0156] For example, in the case of FR1 and SCS of 15kHz, the IAB node will have a meaningful T delta The number of bits of index is set to 11 bits. That is, the IAB node delta The 11-bit content of the upper or lower layer of MAC-CE determines T delta index.

[0157] In addition, for example, in the case of using FR1, SCS is 30kHz, the IAB node will have a meaningful T delta The number of bits of index is set to 10 bits. delta The 10-bit content of the upper or lower layer of MAC-CE determines T delta index.

[0158] In this case, the IAB node may ignore the remaining bits, may expect the remaining bits to be set to default values (eg, 0 or 1), or may expect the remaining bits to be used for other purposes.

[0159] In addition, the T delta The allowed range of index can also be changed for each SCS, FR, or SCS and FR. For example, when using FR1 and SCS is 15kHz, the IAB node can assume (0, 1199), that is, T range of 0 to 1199. delta index.

[0160] In addition, for example, when using FR1 and SCS is 30 kHz, the IAB node may also assume (0, 674), that is, T of 0 to 674. delta index.

[0161] The numerical values shown in Table 3 are only examples, and other values may be set. delta The number of bits of index and Tdelta The allowable range of index can also be determined by T as described in Action Example 1. delta_o That is, the above-mentioned examples of the number of bits and the allowable range can also be based on the assumption of (Alt. 1) of Action Example 1.

[0162] In the case of (Alt.2), the meaningful T delta The number of index bits is constant for all SCS and FR. delta The allowed range of index can also be set for each SCS, FR, or SCS and FR.

[0163] Table 4 shows the meaningful T following (Alt.2) delta The number of bits of index and T delta This is an example of setting the allowable range of index.

[0164] [Table 4]

[0165]

[0166] As shown in Table 4, the significant T delta The number of bits of the index is fixed and has nothing to do with SCS and FR, which is 11 bits. delta MAC-CE T delta The bit field has the same length as the index.

[0167] On the other hand, as shown in Table 4, the T delta The allowed range of index can also be changed for each SCS, FR, or SCS and FR. For example, when using FR1 and SCS is 15kHz, the IAB node can assume (0, 1199), that is, T range of 0 to 1199. delta index.

[0168] In addition, for example, when using FR1 and SCS is 30 kHz, the IAB node may also assume (0, 674), that is, T of 0 to 674. delta index.

[0169] In addition, the numerical values shown in Table 4 are only examples, and other values can also be set. delta The number of bits of index and T delta The allowable range of index can also be determined by T as described in Action Example 1. delta_o That is, the above-mentioned examples of the number of bits and the allowable range can also be based on the assumption of (Alt. 1) of Action Example 1.

[0170] In the case of (Alt.3), the meaningful T delta The number of index bits is constant for all SCS and FR. delta The allowable range of index is also constant for all SCS and FR.

[0171] In the case of (Alt.3), the meaningful T delta The number of bits of index is fixed and has nothing to do with SCS and FR, for example, it can be 11 bits. delta The allowed range of index is also fixed and has nothing to do with SCS and FR. For example, the IAB node can assume (0, 1199), that is, T delta index.

[0172] In the case of (Alt.3), this numerical value is only an example, and other values can be set. delta The number of bits of index and T delta The allowable range of index can also be determined by T as described in Action Example 1. delta_o That is, the above examples of the number of bits and the allowable range can also be based on the assumptions of Action Example 1.

[0173] (4) Action / Effect

[0174] According to the above embodiment, the following effects can be obtained. Specifically, the wireless communication node 100B (IAB node) can set the T included in the time difference from the transmission in the serving cell to the reception in the wireless communication node 100B according to the SCS and FR of the serving cell. delta_o , and set it to apply to T delta_o granularity.

[0175] Therefore, even with appropriate T delta The value of (T delta_value ) varies depending on the SCS and FR of the serving cell, the wireless communication node 100B can also assume an appropriate T delta As a result, the wireless communication node 100B can always appropriately set T delta , which can contribute to more efficient and flexible use of wireless resources and improvement of communication quality of the wireless communication system 10 as a whole.

[0176] In this embodiment, the wireless communication node 100B is delta_oAt least one of the and granularity can be set to a common value regardless of SCS and FR. delta_o When the SCS and FR values do not significantly affect the granularity, the processing load of the wireless communication node 100B can be reduced by setting common values.

[0177] In this embodiment, the wireless communication node 100B can set the expression T according to at least one of the SCS and FR of the serving cell. delta In addition, in this embodiment, the wireless communication node 100B can also set the T to be read based on at least one of SCS and FR. delta The number of bits of index.

[0178] Therefore, even with appropriate T delta The value of (T delta_value ) varies depending on the SCS and FR of the serving cell, the wireless communication node 100B can also assume an appropriate T delta As a result, the wireless communication node 100B can always appropriately set T delta , which can contribute to more efficient and flexible use of wireless resources and improvement of communication quality of the wireless communication system 10 as a whole.

[0179] Furthermore, the wireless communication node 100B can set the T to be read regardless of the SCS and FR of the serving cell. delta That is, the wireless communication node 100B can make the T delta The number of bits of the index is constant (fixed) and has nothing to do with the SCS and FR of the serving cell.

[0180] Therefore, in T delta When the number of bits of the index is not significantly affected by the values of SCS and FR, the processing load of the wireless communication node 100B can be reduced by setting a common value.

[0181] (5) Other Implementation Methods

[0182] Although the embodiment has been described above, the present invention is not limited to the description of the embodiment, and it is obvious that various modifications and improvements can be made by those skilled in the art.

[0183] For example, in the above embodiments, the terms "parent node," "IAB node," and "child node" are used. However, as long as a wireless communication node structure is adopted that integrates wireless backhaul between wireless communication nodes such as gNBs and wireless access to terminals, these names may be different. For example, they may be simply referred to as "first node," "second node," or as "upper node," "lower node," "relay node," or "intermediate node."

[0184] In addition, a wireless communication node may be simply referred to as a communication device or a communication node, and may also be replaced by a wireless base station.

[0185] Furthermore, in the above embodiment, T delta Expressed as additional time, T delta_o Although the reference additional time is expressed, the term additional time can be replaced by other terms, such as predetermined time or minute time. In addition, the term granularity can be replaced by other terms, such as roughness, stage, or grade.

[0186] In the above embodiments, the terms downlink (DL) and uplink (UL) are used, but other terms may be used. For example, they may be replaced with or associated with terms such as forward link, reverse link, access link, and backhaul. Alternatively, only terms such as first link, second link, first direction, and second direction may be used.

[0187] In addition, the block diagrams ( Figure 3 ) shows blocks in units of functions. These functional blocks (structural parts) are implemented by any combination of at least one of hardware and software. In addition, there is no particular limitation on the implementation method of each functional block. That is, each functional block can be implemented using a device that is physically or logically combined, or it can be implemented by connecting two or more physically or logically separated devices directly or indirectly (for example, using wired or wireless connections) and using these multiple devices. The functional block can also be implemented by combining software with the above-mentioned one device or the above-mentioned multiple devices.

[0188] Functionally, these include, but are not limited to, judging, deciding, determining, calculating, calculating, processing, deriving, investigating, searching, confirming, receiving, sending, outputting, accessing, resolving, selecting, choosing, establishing, comparing, assuming, expecting, regarding, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assigning. For example, a functional block (structural unit) that enables the transmission function is called a transmitting unit or a transmitter. In short, as described above, there is no particular limitation on the implementation method.

[0189] Furthermore, the CU 50 and the wireless communication nodes 100A to 100C (the devices) described above can function as a computer that performs the processing of the wireless communication method of the present disclosure. Figure 5 FIG. 1 is a diagram showing an example of the hardware structure of the device. Figure 5 As shown, the device may also be configured as a computer device including a processor 1001 , a memory 1002 (memory), a storage 1003 (storage), a communication device 1004 , an input device 1005 , an output device 1006 , and a bus 1007 .

[0190] In the following description, the word "device" can be replaced with "circuit," "device," "unit," etc. The hardware structure of the device may include one or more of the devices shown in the figures, or may exclude some of the devices.

[0191] Functional blocks of the wireless communication node 100B (see Figure 3 ) is implemented by any hardware element or combination of hardware elements of the computer device.

[0192] In addition, each function in the device is implemented by the following method: predetermined software (program) is read into hardware such as the processor 1001 and the memory 1002, so that the processor 1001 performs calculations and controls the communication of the communication device 1004 or controls at least one of the reading and writing of data in the memory 1002 and the storage 1003.

[0193] The processor 1001 controls the entire computer by, for example, running an operating system. The processor 1001 may be composed of a central processing unit (CPU) including an interface with peripheral devices, a control device, a calculation device, registers, and the like.

[0194] In addition, the processor 1001 reads programs (program codes), software modules, data, etc. from at least one of the memory 1003 and the communication device 1004 to the memory 1002, and performs various processes accordingly. As a program, a program that causes the computer to perform at least a part of the actions described in the above-mentioned embodiment is used. Moreover, with respect to the above-mentioned various processes, although it is described that the above-mentioned various processes are performed by one processor 1001, the above-mentioned various processes can also be performed simultaneously or sequentially by more than two processors 1001. The processor 1001 can also be installed by one or more chips. In addition, the program can also be sent from the network via a telecommunications line.

[0195] Memory 1002 is a computer-readable recording medium and may be composed of, for example, at least one of a read-only memory (ROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), and a random access memory (RAM). Memory 1002 may also be referred to as a register, a cache, or a main memory (main storage device). Memory 1002 may store programs (program code), software modules, and the like that enable execution of the method according to an embodiment of the present disclosure.

[0196] The memory 1003 is a computer-readable recording medium and may be composed of, for example, at least one of an optical disk such as a CD-ROM (Compact Disc ROM), a hard disk drive, a floppy disk, a magneto-optical disk (e.g., a compact disc, a digital versatile disc), a Blu-ray (registered trademark) disk, a smart card, a flash memory (e.g., a card, a stick, a key drive), a Floppy (registered trademark) disk, a magnetic stripe, and the like. The memory 1003 may also be referred to as an auxiliary storage device. The recording medium may be, for example, a database, a server, or other appropriate medium that includes at least one of the memory 1002 and the memory 1003.

[0197] The communication device 1004 is hardware (transceiver) for communicating between computers via at least one of a wired network and a wireless network, and is also called a network device, a network controller, a network card, a communication module, etc.

[0198] For example, the communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, and the like in order to realize at least one of frequency division duplex (FDD) and time division duplex (TDD).

[0199] The input device 1005 is an input device that receives input from the outside (e.g., a keyboard, mouse, microphone, switch, button, sensor, etc.). The output device 1006 is an output device that outputs to the outside (e.g., a display, speaker, LED light, etc.). Alternatively, the input device 1005 and the output device 1006 may be integrally formed (e.g., a touch panel).

[0200] Furthermore, the processor 1001 and the memory 1002 and other devices are connected via a bus 1007 for communicating information. The bus 1007 may be configured using a single bus or may be configured using separate buses for each device.

[0201] Furthermore, the device may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a programmable logic device (PLD), or a field-programmable gate array (FPGA), and some or all of the functional blocks may be implemented using such hardware. For example, the processor 1001 may be implemented using at least one of these hardware components.

[0202] In addition, the notification of information is not limited to the form / implementation method described in the present disclosure, and other methods may also be used. For example, the notification of information may be implemented through physical layer signaling (e.g., downlink control information (DCI: Downlink Control Information), uplink control information (UCI: Uplink Control Information), high-layer signaling (e.g., RRC signaling, medium access control (MAC: Medium Access Control) signaling, broadcast information (Master Information Block (MIB: Master Information Block), System Information Block (SIB: System Information Block)), other signals or a combination thereof. In addition, RRC signaling may also be referred to as an RRC message, such as an RRC Connection Setup message, an RRC Connection Reconfiguration message, etc.

[0203] Each form / embodiment described in this disclosure may also be applied to at least one of LTE (Long Term Evolution), LTE-A (LTE-Advanced), 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, UWB (Ultra-WideBand), Bluetooth (registered trademark), systems using other appropriate systems, and next-generation systems derived therefrom. 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.

[0204] The processing procedures, timings, and flows of each form / implementation described in this disclosure may be performed in a different order unless there is a conflict. For example, the methods described in this disclosure use an illustrative order to present the elements of various steps, but are not limited to the specific order presented.

[0205] In this disclosure, specific actions performed by a base station are sometimes performed by its upper node, depending on the situation. In a network consisting of one or more network nodes including a base station, various actions performed to communicate with a terminal can be performed by at least one of the base station and other network nodes other than the base station (for example, an MME or S-GW, but not limited thereto). In the above description, the example of a single other network node other than the base station is illustrated, but the other network node may also be a combination of multiple other network nodes (for example, an MME and an S-GW).

[0206] Information, signals (information, etc.) can be output from a higher layer (or lower layer) to a lower layer (or higher layer), and can also be input or output via multiple network nodes.

[0207] Input or output information can be stored in a specific location (e.g., memory) or managed using a management table. Input or output information can be overwritten, updated, or appended. Output information can also be deleted. Input information can also be sent to other devices.

[0208] The determination may be made using a value represented by one bit (0 or 1), a Boolean value (true or false), or a comparison of numerical values (for example, comparison with a predetermined value).

[0209] Each form / implementation described in this disclosure may be used individually or in combination, and may be switched between them depending on the execution. Furthermore, notification of scheduled information is not limited to being performed explicitly (e.g., a notification of "yes X") but may also be performed implicitly (e.g., not notifying the scheduled information).

[0210] Software, whether referred to as software, firmware, middleware, microcode, hardware description language, or by other names, shall be interpreted broadly to refer to instructions, sets of instructions, code, code segments, program code, programs, subroutines, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, etc.

[0211] Furthermore, software, commands, information, and the like may be transmitted and received via a transmission medium. For example, if software is transmitted from a website, server, or other remote source using at least one of a wired technology (coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and a wireless technology (infrared, microwave, etc.), then at least one of these wired and wireless technologies is included within the definition of a transmission medium.

[0212] The information, signals, etc. described in this disclosure may also be represented using any of a variety of different technologies. For example, data, commands, instructions, information, signals, bits, symbols, chips, etc. that may be referred to in the entire description may be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any combination thereof.

[0213] In addition, the terms used in this disclosure and those required 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 also be referred to as a carrier frequency, a cell, a frequency carrier, etc.

[0214] As used in this disclosure, the terms "system" and "network" are used interchangeably.

[0215] In addition, the information, parameters, etc. described in this disclosure may be represented by absolute values, relative values relative to predetermined values, or other corresponding information. For example, wireless resources may also be indicated by indexes.

[0216] The names used for the above parameters are not limiting in any way. Furthermore, the formulas and the like using these parameters may sometimes differ from those explicitly disclosed in this disclosure. Various channels (e.g., PUCCH, PDCCH, etc.) and information elements can be identified by appropriate names, and the names assigned to these channels and information elements are not limiting in any way.

[0217] In this disclosure, terms such as "base station (BS)", "wireless base station", "fixed station", "NodeB", "eNodeB (eNB)", "gNodeB (gNB)", "access point", "transmission point", "reception point", "transmission / reception point", "cell", "sector", "cell group", "carrier", and "component carrier" are used interchangeably. Base stations are also sometimes referred to as macrocells, small cells, femtocells, and picocells.

[0218] A base station can accommodate one or more (for example, three) cells (also known as sectors). When a base station accommodates multiple cells, the base station's overall coverage area can be divided into multiple smaller areas, each of which can also provide communication services through a base station subsystem (for example, a small base station (Remote Radio Head: RRH) for indoor use).

[0219] The terms "cell" or "sector" refer to a portion or the entire coverage area of at least one of a base station and a base station subsystem that provides communication services within the coverage area.

[0220] In the present disclosure, terms such as “mobile station (MS)”, “user terminal (user terminal)”, “user equipment (UE)”, and “terminal” may be used interchangeably.

[0221] For mobile stations, those skilled in the art sometimes also use the following terms to refer to them: subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other appropriate terms.

[0222] At least one of the base station and the mobile station may also be referred to as a transmitting device, a receiving device, a communication device, etc. In addition, at least one of the base station and the mobile station may be a device mounted on a mobile body, the mobile body itself, etc. The mobile body may be a vehicle (e.g., a car, an airplane, etc.), a mobile body that moves unmanned (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). In addition, at least one of the base station and the mobile station also includes a device that does not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

[0223] In addition, the base station in the present disclosure can also be replaced by a mobile station (user terminal, the same below). For example, regarding a structure in which the communication between a base station and a mobile station is replaced by communication between multiple mobile stations (for example, it can also be called D2D (Device-to-Device: device to device), vehicle-to-everything system (V2X), etc.), the various forms / implementations of the present disclosure can also be applied. In this case, it can also be set as a structure in which the mobile station has the functions of the base station. In addition, terms such as "uplink" and "downlink" can also be replaced by terms corresponding to communication between terminals (for example, "side"). For example, uplink channels, downlink channels, etc. can also be replaced by side channels.

[0224] Likewise, the mobile station in the present disclosure may be replaced by a base station. In this case, the base station may have the same functions as the mobile station.

[0225] A radio frame may be further composed of one or more frames in the time domain. In the time domain, one or more frames may be referred to as subframes.

[0226] A subframe may consist of one or more time slots in the time domain. A subframe may also be a fixed time length (eg, 1 ms) that is independent of a numerology.

[0227] A parameter set may be a communication parameter applied to at least one of the transmission and reception of a signal or channel. For example, the parameter set may represent at least one of the following: subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame structure, specific filtering performed by the transceiver in the frequency domain, specific windowing performed by the transceiver in the time domain, and the like.

[0228] A slot may be composed of one or more symbols (OFDM (Orthogonal Frequency Division Multiplexing) symbols, SC-FDMA (Single Carrier Frequency Division Multiple Access) symbols, etc.) in the time domain. A slot may be a time unit based on a parameter set.

[0229] A time slot may contain multiple mini-slots. Each mini-slot may consist of one or more symbols in the time domain. Furthermore, a mini-slot may also be referred to as a sub-slot. A mini-slot may consist of fewer symbols than a time slot. A PDSCH (or PUSCH) transmitted in time units larger than a mini-slot may be referred to as PDSCH (or PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot may be referred to as PDSCH (or PUSCH) mapping type B.

[0230] Radio frame, subframe, time slot, mini-time slot, and symbol all represent time units for signal transmission. Radio frame, subframe, time slot, mini-time slot, and symbol may be referred to by other corresponding names.

[0231] For example, a subframe can also be called a transmission time interval (TTI), multiple consecutive subframes can also be called a TTI, and a slot or a mini-slot can also be called a TTI. That is, at least one of a subframe and a TTI can be a subframe (1ms) in existing LTE, a period shorter than 1ms (for example, 1-13 symbols), or a period longer than 1ms. Furthermore, the unit representing a TTI can be a slot, a mini-slot, or the like, rather than a subframe.

[0232] Here, TTI refers to, for example, the minimum time unit for scheduling in wireless communications. For example, in the LTE system, a base station schedules the allocation of radio resources (such as the frequency bandwidth and transmit power available to each user terminal) to each user terminal using TTIs. The definition of TTI is not limited to this.

[0233] The TTI can be the time unit for transmitting data packets (transport blocks), code blocks, code words, etc. after channel coding, and can also be the processing unit for scheduling, link adaptation, etc. In addition, when a TTI is given, the time interval (for example, the number of symbols) to which the transport blocks, code blocks, code words, etc. are actually mapped can be shorter than the TTI.

[0234] In addition, when one time slot or one mini-time slot is referred to as a TTI, one or more TTIs (i.e., one or more time slots or one or more mini-time slots) can constitute the minimum time unit for scheduling. In addition, the number of time slots (the number of mini-time slots) constituting the minimum time unit for scheduling can be controlled.

[0235] A TTI with a time length of 1 ms may also be referred to as a normal TTI (TTI in LTE Rel. 8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, a long subframe, a time slot, etc. A TTI shorter than a normal TTI may be referred to as a shortened TTI, a short TTI, a partial or fractional TTI, a shortened subframe, a short subframe, a minislot, a subslot, a time slot, etc.

[0236] In addition, for long TTI (for example, normal TTI, subframe, etc.), it can be replaced with a TTI with a time length of more than 1ms, and for short TTI (for example, shortened TTI, etc.), it can be replaced with a TTI length that is smaller than long TTI (longTTI) and has a TTI length of more than 1ms.

[0237] A resource block (RB) is a unit of resource allocation in the time and frequency domains. In the frequency domain, it can contain one or more consecutive subcarriers. The number of subcarriers contained in an RB can be the same regardless of the parameter set, for example, it can be 12. The number of subcarriers contained in an RB can also be determined by the parameter set.

[0238] In addition, the time domain of an RB may include one or more symbols and may be the length of one slot, one mini-slot, one subframe, or one TTI. One TTI, one subframe, etc. may each be composed of one or more resource blocks.

[0239] In addition, 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, and the like.

[0240] 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.

[0241] A Bandwidth Part (BWP) (also known as a fractional bandwidth) can represent a subset of contiguous common resource blocks (RBs) for a particular parameter set within a carrier. Common RBs can be identified by their index relative to the common reference point of the carrier. PRBs can be defined within a BWP and numbered within that BWP.

[0242] The BWP may include a BWP for UL (UL BWP) and a BWP for DL (DL BWP). One or more BWPs may be configured for a UE within a single carrier.

[0243] At least one of the configured BWPs may be active, and it is not assumed that the UE transmits or receives predetermined signals / channels outside of the activated BWP. In addition, "cell", "carrier", etc. in the present disclosure may be replaced with "BWP".

[0244] The above-described structures of radio frames, subframes, slots, mini-slots, and symbols are merely examples. For example, various modifications may be made to the structures including the number of subframes in a radio frame, the number of slots per subframe or radio frame, the number of mini-slots in a slot, the number of symbols and RBs in a slot or mini-slot, the number of subcarriers in an RB, the number of symbols in a TTI, the symbol length, and the cyclic prefix (CP) length.

[0245] The terms "connected", "coupled" or any variation of these terms are intended to indicate any direct or indirect connection or combination between two or more elements, and may include situations where there is one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The combination or connection between elements may be a physical combination or connection, a logical combination or connection, or a combination of these. For example, "access" may be used instead of "connection". As used in this disclosure, two elements may be considered to be "connected" or "coupled" to each other using at least one of one or more wires, cables and printed electrical connections, and as some non-limiting and non-inclusive examples, electromagnetic energy having wavelengths in the wireless frequency domain, microwave region and optical (visible and invisible) region may be used to "connect" or "couple" to each other.

[0246] The reference signal may be referred to as Reference Signal (RS) for short, or may be referred to as a pilot signal depending on the applied standard.

[0247] The phrase "according to" used in this disclosure does not mean "only according to" unless otherwise expressly stated. In other words, the phrase "according to" means both "only according to" and "at least according to."

[0248] The “unit” in the configuration of each of the above-mentioned devices may be replaced with a “section,” “circuit,” “device,” or the like.

[0249] Any reference to an element using the terms "first," "second," etc., as used in this disclosure, does not necessarily limit the number or order of these elements. These terms can be used as a convenient way to distinguish between two or more elements in this disclosure. Therefore, a reference to a first element and a second element does not imply that only two elements can be used or that the first element must precede the second element in any manner.

[0250] When the terms "include," "including," and variations thereof are used in this disclosure, these terms are intended to be inclusive, similar to the term "comprising." Furthermore, the term "or" used in this disclosure does not mean an exclusive OR.

[0251] In the present disclosure, when an article is added by translation, such as a, an, and the in English, the present disclosure may also include cases where the noun following the article is in a plural form.

[0252] As used in this disclosure, terms such as “determining” and “determining” sometimes also include a variety of actions. “Determining” and “judging” may, for example, include considering matters such as judging, calculating, computing, processing, deriving, investigating, looking up, searching, inquiring (for example, searching in a table, database or other data structure), and ascertaining as matters that have been “determined” or “determined”. In addition, “determining” and “receiving” (for example, receiving information), transmitting (for example, sending information), inputting, outputting, accessing (for example, accessing data in a memory) as matters that have been “determined” or “determined”. In addition, “determining” and “resolving” may include matters such as selecting, choosing, establishing, and comparing as matters that have been “determined” or “determined”. That is, "judgment" and "decision" can include matters that are considered to have "judged" or "decided" any action. In addition, "judgment (decision)" can also be replaced by "assuming (assuming)", "expecting (expecting)", "considering (considering)", etc.

[0253] In this disclosure, the phrase "A is different from B" may also mean "A and B are different from each other." Furthermore, the phrase may also mean "A and B are each different from C." Terms such as "separate" and "combined" may also be interpreted in the same way as "different."

[0254] While the present disclosure has been described in detail above, it should be 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 various modifications and variations without departing from the spirit and scope of the present disclosure as defined by the claims. Therefore, the description of the present disclosure is for illustrative purposes only and does not have any limiting meaning on the present disclosure.

[0255] Description of labels

[0256] 10: Wireless communication system;

[0257] 50: CU;

[0258] 100A, 100B, 100C: wireless communication nodes;

[0259] 161: wireless transmission unit;

[0260] 162: wireless receiving unit;

[0261] 165: cell information acquisition unit;

[0262] 170: Control Department;

[0263] UE: 200;

[0264] 1001: processor;

[0265] 1002: Memory;

[0266] 1003: memory;

[0267] 1004: Communication device;

[0268] 1005: input device;

[0269] 1006: Output device.

[0270] 1007: Bus.

Claims

1. A wireless communication node comprising: A receiving unit receives a control element including an additional time T included in a time difference in a DL direction from a DU in a serving cell to a MT in the wireless communication node. delta , the DU is a distributed unit, and the MT is a mobile terminal; and A control section that uses the additional time T provided by the control element delta The index of the additional time T delta The granularity and the additional time T delta The initial value of determines the calculation formula for calculating the time difference.

2. The wireless communication node according to claim 1, wherein The control unit sets the granularity corresponding to a frequency range to be used.

3. The wireless communication node according to claim 2, wherein: When using a second frequency range having a frequency higher than the first frequency range, the control unit sets a granularity coarser than the granularity applied to the first frequency range.

4. A communication system, wherein: The communication system includes a first wireless communication node and a second wireless communication node, The first wireless communication node comprises: A transmitting unit that transmits a control element including an additional time T included in a time difference in the DL direction from when the DU in the serving cell is transmitted to when the MT in the second wireless communication node is received. delta The index of , the DU is a distributed unit, the MT is a mobile terminal, The second wireless communication node has: a receiving unit configured to receive the control element; and A control section that uses the additional time T provided by the control element delta The index of the additional time T delta The granularity and the additional time T delta The initial value of determines the calculation formula for calculating the time difference.

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