Wireless communication nodes

Abstract

When adjusting the transmission timing of a downlink and the reception timing of an uplink in the wireless communication node (100B), the wireless communication node (100A) determines an adjustment value of the reception timing based on the timing information used in determining the transmission timing of the uplink, or an offset value relative to the timing information. The wireless communication node (100A) transmits the determined adjustment value or offset value to the wireless communication node (100B).

Description

Technical Field

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

[0002] The 3rd Generation Partnership Project (3GPP) standardizes Long Term Evolution (LTE), and with the aim of further speeding up LTE, it standardizes LTE-Advanced (hereinafter referred to as LTE including LTE-Advanced), and LTE's successor systems such as 5G New Radio (NR) or Next Generation (NG).

[0003] For example, in the radio access network (RAN) of NR, integrated access and backhaul (IAB) is being studied, which integrates the wireless access to the terminal (User Equipment: UE) and the wireless backhaul between wireless communication nodes such as the wireless base station (gNB) (see non-patent document 1).

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

[0005] In 3GPP Release 16, half-duplex communication and time division multiplexing (TDM) are premised in radio access and radio backhaul, and in Release 17 and later, the application of space division multiplexing (SDM) and frequency division multiplexing (FDM) is being studied.

[0006] In non-patent document 1, seven cases are defined regarding the alignment of the transmission timing of the parent node and the IAB node. For example, as a premise, the alignment of the transmission timing of the downlink (DL) of the IAB node and the IAB donor (Case #1), the alignment of the reception timing of the DL and uplink (UL) within the IAB node (Case #3), and the combination of the alignment of the transmission timing of the DL of Case #1 and the reception timing of the UL of Case #3 (Case #7) are defined.

[0007] In case #1, in order to make the DL transmission timing of each node's DU consistent, it is agreed that the IAB node uses the calculation formula (TA / 2+T_delta) to calculate the propagation delay (T propagation_0 ) and shift the sending timing for sending.

[0008] Here, TA is a value of Timing Advance for determining the transmission timing of the UE specified in 3GPP Release 15, and T_delta is determined in consideration of the switching time from reception to transmission of the parent node and the like.

[0009] Prior art literature

[0010] Non-patent literature

[0011] Non-patent document 1: 3GPP TR 38.874 V16.0.0, 3rd Generation Partnership Project; Technical Specification Group Radio Access Network; NR; Study on Integrated Access and Backhaul; (Release 16), 3GPP, December 2018 Summary of the invention

[0012] As described above, in Case #7, in addition to Case #1, specifically, in addition to adjusting the DL transmission timing of the IAB node and the IAB donor DU, Case #3, specifically, adjusting the DL and UL reception timing within the IAB node, needs to be implemented.

[0013] That is, when supporting Case#7, in addition to the DL transmission timing between the gNB and the IAB node, the DL and UL reception timing of the IAB node also need to be consistent.

[0014] Therefore, the present invention is completed in view of this situation, and its purpose is to provide a wireless communication node that can reliably match the transmission timing and reception timing of a distributed unit (DU) and a mobile terminal (MT) in integrated access and backhaul (IAB).

[0015] One embodiment of the present disclosure is a wireless communication node (e.g., wireless communication node 100A), comprising: a control unit (control unit 140) which, when adjusting the transmission timing of a downlink and the reception timing of an uplink in a lower node (e.g., wireless communication node 100B), determines an adjustment value of the reception timing based on the timing information (TA) used in determining the transmission timing of the uplink, or an offset value relative to the timing information; and a sending unit (timing-related information sending unit 150) which sends the adjustment value or the offset value to the lower node.

[0016] One embodiment of the present disclosure is a wireless communication node (for example, wireless communication node 100B), which includes: a control unit (control unit 170) which determines a method for adjusting the transmission timing of the downlink and the reception timing of the uplink according to downlink control information from an upper node, or the transmission timing of the downlink and the reception timing of the uplink when adjusting the transmission timing of the downlink and the reception timing of the uplink at the wireless communication node; and a transceiver unit (wireless transmission unit 161 and wireless reception unit 162) which receives the uplink from a lower node and sends the downlink to the lower node according to the determined adjustment method. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a diagram schematically showing the overall structure of the wireless communication system 10 .

[0018] Figure 2 This is a diagram showing a basic configuration example of IAB.

[0019] Figure 3 FIG. 4 is a functional block diagram of the wireless communication node 100A.

[0020] Figure 4 FIG. 4 is a functional block diagram of the wireless communication node 100B.

[0021] Figure 5 It shows T pr A diagram showing an example of the relationship among opagation_0, TA, and T_delta.

[0022] Figure 6 is a diagram showing an example of timing alignment at the symbol level at the parent node and the IAB node in Case #7.

[0023] Figure 7 is a diagram showing an example of timing alignment at the slot level at the parent node and the IAB node in Case #7.

[0024] Figure 81 is a diagram showing an example of timing alignment at the time slot level at the parent node in Case #7 (including Tp and T1).

[0025] Fig. 9 It is a diagram showing a configuration example of a random access response (Random Access Response: RAR) and MAC-CE.

[0026] Fig.10 is a diagram showing an example of timing alignment at a parent node and an IAB node according to Release 15 (legacy) of 3GPP, Case#6, and Case#7.

[0027] Fig.11 1 is a diagram showing an example of the hardware configuration of the CU 50 and the wireless communication nodes 100A to 100C. DETAILED DESCRIPTION

[0028] Hereinafter, the embodiments will be described based on the drawings. In addition, the same or similar reference numerals are given to the same functions and structures, and the description thereof will be appropriately omitted.

[0029] (1) Overall schematic structure of wireless communication system

[0030] Figure 1 1 is a diagram schematically showing the overall configuration of a wireless communication system 10 according to the present embodiment. The wireless communication system 10 is a wireless communication system in accordance with 5G New Radio (NR), and is composed of a plurality of wireless communication nodes and terminals.

[0031] Specifically, the wireless communication system 10 includes wireless communication nodes 100A, 100B, 100C and a terminal 200 (hereinafter referred to as UE 200 or User Equipment).

[0032] The wireless communication nodes 100A, 100B, and 100C can set up wireless access with the UE 200 and a wireless backhaul (BH) between the wireless communication nodes. Specifically, a backhaul (transmission path) based on a wireless link is set up between the wireless communication node 100A and the wireless communication node 100B, and between the wireless communication node 100A and the wireless communication node 100C.

[0033] 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 Integrated Access and Backhaul (IAB).

[0034] IAB reuses existing functions and interfaces defined for wireless access. In particular, Mobile-Termination (MT), gNB-DU (Distributed Unit), gNB-CU (Central Unit), User Plane Function (UPF), Access and Mobility Management Function (AMF) and Session Management Function (SMF), as well as corresponding interfaces such as NR Uu (MT to gNB / DU), F1, NG, X2 and N4 are used as the baseline.

[0035] The wireless communication node 100A is connected to the NR's network access network (NG-RAN) and core network (Next Generation Core (NGC) or 5GC) via a wired transmission path such as optical fiber transmission. The NG-RAN / NGC includes a central unit 50 (hereinafter referred to as CU 50) as a communication node. In addition, the NG-RAN and NGC may be simply expressed as a "network".

[0036] In addition, CU 50 may also be composed of any one or a combination of the above-mentioned UPF, AMF, and SMF. Alternatively, CU50 may also be a gNB-CU as described above.

[0037] Figure 2 : is a diagram showing a basic structural example of IAB. Figure 2 As shown, in this embodiment, the wireless communication node 100A constitutes a parent node in the IAB, and the wireless communication node 100B (and the wireless communication node 100C) constitute an IAB node in the IAB. In addition, the parent node may also be referred to as an IAB donor.

[0038] The child node in IAB consists of Figure 1 Alternatively, UE200 may also constitute a child node.

[0039] A wireless link is set up between the parent node and the IAB node. Specifically, a wireless link called Link_parent is set up.

[0040] A wireless link is established between the IAB node and the child node. Specifically, a wireless link called Link_child is established.

[0041] The wireless link set up between such wireless communication nodes is called a wireless backhaul link. Link_parent is composed of the "DL Parent BH" in the downlink (DL) direction and the "UL Parent BH" in the uplink (UL) direction. Link_child is composed of the "DL Child BH" in the DL direction and the "UL Child BH" in the UL direction.

[0042] 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.

[0043] In addition, the radio link set up between the UE 200 and the IAB node or the parent node is called a radio access link. Specifically, the radio link is composed of a DL access (DL Access) in the DL direction and a UL access (UL Access) in the UL direction.

[0044] The IAB node has a function of connecting to a parent node, namely a mobile terminal (MT), and a function of connecting to a child node (or UE 200), namely a distributed unit (DU). In addition, a child node may also be referred to as a lower node.

[0045] 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.

[0046] In addition, 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 .

[0047] Regarding the wireless resources used by DU, DL, UL and flexible time-resource (D / U / F) are classified into any type of "Hard", "Soft" or "Not Available" (H / S / NA) based on the DU's point of view. In addition, "Available" or "Not Available" is also specified in Soft (S).

[0048] in addition, Figure 2The example of the IAB structure shown uses CU / DU splitting, but the structure of the IAB is not necessarily limited to this structure. For example, in the wireless backhaul, the IAB can be composed of a tunnel using GPRS Tunneling Protocol-User Plane / User Datagram Protocol (GPRSTunneling Protocol-U / User Datagram Protocol: GTP-U / UDP) / Internet Protocol (Internet Protocol: IP).

[0049] The main advantage of IAB is the ability to flexibly and densely configure NR cells without densifying the transmission network. IAB can be applied to various scenarios such as outdoor small cell configuration, indoor, and mobile relay station (mobilerelay) support (for example, in buses and trains).

[0050] 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.).

[0051] In this embodiment, the wireless access and wireless backhaul are operated based on half-duplex communication. However, it is not necessarily limited to half-duplex communication, and full-duplex communication may be used as long as the requirements are met.

[0052] In addition, the multiplexing method can use time division multiplexing (TDM), space division multiplexing (SDM) and frequency division multiplexing (FDM).

[0053] When the IAB node operates in accordance with half-duplex communication, the DL Parent BH becomes the receiving (RX) side, the UL Parent BH becomes the transmitting (TX) side, the DL Child BH becomes the transmitting (TX) side, and the UL Child BH becomes the receiving (RX) side. In addition, in the case of time division duplex (TDD), the DL / UL setting mode at the IAB node is not limited to DL-F-UL, and only wireless backhaul (BH), UL-F-DL and other setting modes can also be applied.

[0054] Furthermore, in this embodiment, SDM / FDM is used to realize the simultaneous operation of the DU and the MT of the IAB node.

[0055] (2) Functional block structure of wireless communication system

[0056] Next, the functional block configuration of the wireless communication node 100A and the wireless communication node 100B constituting the wireless communication system 10 will be described.

[0057] (2.1) Wireless communication node 100A

[0058] Figure 3 FIG. 1 is a functional block diagram of the wireless communication node 100A constituting the parent node. Figure 3 As shown, the wireless communication node 100A includes a wireless transmission unit 110 , a wireless reception unit 120 , a NW IF unit 130 , a control unit 140 , and a timing-related information transmission unit 150 .

[0059] The wireless transmission unit 110 transmits a wireless signal in accordance with the 5G standard. In addition, the wireless reception unit 120 receives a wireless signal in accordance with the 5G standard. In this embodiment, the wireless transmission unit 110 and the wireless reception unit 120 perform wireless communication with the wireless communication node 100B constituting the IAB node.

[0060] In the present embodiment, the wireless communication node 100A has the functions of MT and DU, and the wireless transmission unit 110 and the wireless reception unit 120 also transmit and receive wireless signals corresponding to MT / DU.

[0061] The NW IF unit 130 provides a communication interface for realizing connection with the NGC side, etc. For example, the NW IF unit 130 may include interfaces such as X2, Xn, N2, and N3.

[0062] The control unit 140 controls each functional block constituting the wireless communication node 100A. In particular, in the present embodiment, the control unit 140 controls the transmission timing of DL and UL, and the reception timing of UL. Specifically, the control unit 140 can adjust the transmission timing of DL and the transmission timing of UL in the lower node such as the wireless communication node 100B (IAB node). In addition, the control unit 140 can adjust the reception timing of UL in the wireless communication node 100B (IAB node).

[0063] The adjustment of the DL transmission timing of each wireless communication node including the wireless communication node 100A by the control unit 140 corresponds to Case #1 specified in 3GPP TR 38.874 as described later.

[0064] Furthermore, the adjustment of the transmission timing of DL and UL at the IAB node may correspond to the case #2. Furthermore, the adjustment of the reception timing of DL and UL at the IAB node may correspond to the case #3.

[0065] In addition, the adjustment at the IAB node may include adjustment of the DL transmission timing at the IAB node, and the DL and UL transmission timings may be adjusted within the IAB node.

[0066] That is, the control unit 140 can support Case #6 which is a combination of adjustment of the transmission timing of DL in Case #1 and UL in Case #2.

[0067] Furthermore, the adjustment at the IAB node may include adjustment of the DL transmission timing at the IAB node, and may also include adjustment of the DL and UL reception timings within the IAB node.

[0068] That is, the control unit 140 can support Case #7 which is a combination of adjustment of DL transmission timing in Case #1 and adjustment of UL reception timing in Case #3.

[0069] The control unit 140 can obtain the propagation delays of the wireless communication node 100A (parent node) and the wireless communication node 100B (lower node).

[0070] Specifically, the control unit 140 calculates the propagation delay of the path (0) between the parent node and the lower node based on (Equation 1).

[0071] T propagation_0 =(TA / 2+T_delta)……(Formula 1)

[0072] TA is a value of a timing advance (TA) for determining a transmission timing of a UE, which is specified in 3GPP Release 15. Here, TA may also be referred to as timing information.

[0073] In addition, T_delta is determined by taking into account the switching time from reception to transmission of the parent node, etc. propagation_0 The calculation method of is further described later.

[0074] As described above, the control unit 140 can obtain the propagation delay of the wireless communication node 100A (parent node) and the wireless communication node 100B (lower node) used in determining the transmission timing of DL, and the propagation delay of the wireless communication node 100A and the wireless communication node 100B used in determining the transmission timing of UL at the wireless communication node 100B, while adjusting the transmission timing of DL and the transmission timing of UL at the IAB node (which can also be replaced by the situation corresponding to Case#6).

[0075] Additionally, propagation delay can mean that T propagation_0, may also mean TA / 2 or TA. In addition, propagation delay may be referred to as transmission time, delay time, or simply delay, etc., and may be referred to by other names as long as it indicates the time required for DL ​​or UL transmission between wireless communication nodes constituting IAB.

[0076] In addition, when adjusting the transmission timing of the DL and the reception timing of the UL at the lower node (which can also be replaced with the situation corresponding to Case#7), the control unit 140 can determine the timing information used in determining the transmission timing of the UL, specifically, determine the adjustment value of the reception timing based on the TA or the offset value relative to the timing information (TA).

[0077] Here, the adjustment value of the reception timing based on the TA may refer to a value obtained by adding information indicating positive (+) or negative (-) (e.g., 1 bit) to the value of the TA using a TA command (TA command) in a random access response (Random Access Response: RAR). In addition, the adjustment value may be only information indicating a negative value, or may be another value associated with a negative value, etc.

[0078] Alternatively, the value of TA (N TA ) is extended. Specifically, in 3GPP Release-15, N TA The values ​​can be 0, 1, 2, ..., 3846, but the adjustment value of the reception timing based on the TA can be expressed as a negative value by subtracting the values ​​of 3847 to 4095 from 3846. In addition, in the case of 3847 and later, it can be regarded as implicitly applied as a negative value without necessarily subtracting.

[0079] In addition, the offset value with respect to the timing information (TA) may indicate an offset (time) with respect to the TA specified in Release 15 of 3GPP or the TA value corresponding to Case #6 described above. In addition, the offset value may be a value based on the TA, or may not be a value based on the TA as long as the offset time can be determined.

[0080] The timing-related information transmitting unit 150 transmits information (also referred to as timing-related information) related to DL or UL transmission timing or reception timing to lower nodes. Specifically, the timing-related information transmitting unit 150 can transmit information related to DL or UL transmission timing or reception timing to the IAB node and / or the child node.

[0081] Furthermore, the timing-related information transmitting unit 150 can transmit the above-mentioned adjustment value of the reception timing based on the TA or the offset value with respect to the TA to the lower node.

[0082] In addition, the timing information (TA) can be sent using a TA command in a random access response (RAR) or a medium access control-control element (MAC-CE). Similarly, information indicating adjustment of the DL transmission timing and the UL transmission timing or reception timing at the IAB node, and timing association information indicating the above-mentioned adjustment value and offset value can also be sent using MAC-CE, but can also be sent using appropriate channels or signaling of higher layers (radio resource control layer (RRC) etc.).

[0083] In addition, the timing information and timing-related information may also be sent using appropriate channels or higher-layer signaling.

[0084] The channels include control channels and data channels. The control channels include PDCCH (Physical Downlink Control Channel), PUCCH (Physical Uplink Control Channel), PRACH (Physical Random Access Channel) and PBCH (Physical Broadcast Channel).

[0085] In addition, the data channel includes PDSCH (Physical Downlink Shared Channel) and PUSCH (Physical Uplink Shared Channel) and the like.

[0086] In addition, the reference signal includes a demodulation reference signal (DMRS), a sounding reference signal (SRS), a phase tracking reference signal (PTRS) and a channel state information reference signal (CSI-RS), and the signal includes a channel and a reference signal. In addition, data may mean data sent via a data channel.

[0087] UCI is control information symmetrical to downlink control information (DCI), and is transmitted via PUCCH or PUSCH. UCI may include SR (Scheduling Request), HARQ (Hybrid Automatic Repeat Request) ACK / NACK, and CQI (Channel Quality Indicator).

[0088] (2.2) Wireless communication node 100B

[0089] Figure 4 FIG. 1 is a functional block diagram of a wireless communication node 100B constituting an IAB node. Figure 4 As shown, the wireless communication node 100B includes a wireless transmission unit 161 , a wireless reception unit 162 , a downlink control information reception unit 165 , and a control unit 170 .

[0090] The wireless transmission unit 161 transmits a wireless signal in accordance with the 5G specification. In addition, the wireless reception unit 162 receives a wireless signal in accordance with the 5G specification. In this embodiment, the wireless transmission unit 161 and the wireless reception unit 162 perform wireless communication with the wireless communication node 100A constituting the parent node, and wireless communication with the child node (including the UE 200).

[0091] Furthermore, the wireless transmission unit 161 and the wireless reception unit 162 receive UL from the lower node and transmit DL to the lower node according to the adjustment method of DL transmission timing and UL reception timing determined by the control unit 170. In this embodiment, the wireless transmission unit 161 and the wireless reception unit 162 constitute a transmission and reception unit.

[0092] The downlink control information receiving unit 165 receives downlink control information (DCI) from the upper node. Specifically, the downlink control information receiving unit 165 can receive DCI including information indicating a method of adjusting the transmission timing of DL and the reception timing of UL.

[0093] More specifically, the downlink control information receiving unit 165 can receive DCI indicating which of Case#1, Case#6 and Case#7 is applied. That is, Case#1, Case#6 and Case#7 can be dynamically changed (switched) in the network.

[0094] The control unit 170 controls each functional block constituting the wireless communication node 100B. In particular, in the present embodiment, the control unit 170 can adjust the transmission timing of DL and the transmission timing and reception timing of UL in the wireless communication node 100B (lower node).

[0095] Specifically, the control unit 170 makes the UL transmission timing consistent with the DL transmission timing when adjusting the DL transmission timing and the UL transmission timing at the wireless communication node 100B (lower node). That is, the control unit 170 makes the UL transmission timing consistent with the DL transmission timing based on the DL transmission timing.

[0096] In addition, the control unit 170 can determine the adjustment method of the DL transmission timing and the UL reception timing based on the downlink control information (DCI) from the upper node, or the DL transmission timing and the UL reception timing when adjusting the DL transmission timing and the UL reception timing at the wireless communication node 100B (which can also be replaced by the situation corresponding to Case#7).

[0097] Specifically, the control unit 170 can determine which adjustment method among Case#1, Case#6, and Case#7 is applied based on the information included in the received DCI. Alternatively, the control unit 170 can implicitly determine which adjustment method among Case#1, Case#6, and Case#7 is applied based on the DL transmission timing and UL reception timing sent and received by the wireless communication node 100B. In addition, the operation of the wireless communication node 100B (IAB node) implicitly determining which adjustment method among Case#1, Case#6, and Case#7 is applied will be described later.

[0098] In addition, the control unit 170 can adjust the DL transmission timing at the upper node (e.g., the wireless communication node 100A) and the DL transmission timing at the wireless communication node 100B according to the time related to the switch from UL reception to DL transmission, specifically, according to T_delta. In addition, in this case, T_delta can be set to a value of half the switching time from reception to transmission at the upper node (parent node). That is, the control unit 170 can adjust the DL transmission timing in consideration of the switching time from reception to transmission at the parent node.

[0099] In addition, such adjustment of DL transmission timing may be performed by the wireless communication node 100A.

[0100] (3) Operation of wireless communication system

[0101] Next, the operation of the wireless communication system 10 will be described. Specifically, the operation related to the adjustment of the transmission timing and reception timing of DL and UL in the wireless communication system 10 will be described.

[0102] More specifically, adjustment of DL and UL transmission timing in IAB using SDM and / or FDM as a multiplexing method, particularly adjustment of DL and UL transmission timing when Case #6 specified in 3GPP TR 38.874 is applied, is described.

[0103] (3.1) 3GPP regulations

[0104] First, the regulations of 3GPP are briefly described. 3GPP TR 38.874 (for example, V16.0.0) stipulates the following seven cases in order to make the DL or UL transmission timings between wireless communication nodes constituting IAB consistent.

[0105] (Case #1): DL transmission timing adjustment between IAB node and IAB donor

[0106] (Case #2): Adjustment of DL and UL transmission timing within the IAB node

[0107] (Case #3): Adjustment of DL and UL reception timing within the IAB node

[0108] (Case #4): Sending based on Case #2 and receiving based on Case #3 within the IAB node

[0109] (Case #5): Application of Case #1 to access link timing within IAB nodes in different time slots and application of Case #4 to backhaul link timing

[0110] (Case #6): DL transmission timing adjustment of Case #1 + UL transmission timing adjustment of Case #2

[0111] (Case #7): DL transmission timing adjustment of Case #1 + UL reception timing adjustment of Case #3

[0112] In Release 16 of 3GPP, as described above, in order to make the DL transmission timing of DUs between the wireless communication nodes constituting the IAB consistent, the following situation is agreed upon through negotiation: the IAB node uses the calculation formula (TA / 2+T_delta) to calculate the propagation delay (T propagation_0 ) and shift the sending timing for sending.

[0113] Here, TA is a value of Timing Advance for determining the transmission timing of UE specified in Release 15 of 3GPP, and T_delta is determined in consideration of the switching time from reception to transmission of the parent node and the like.

[0114] Figure 5 It shows T propagation_0 An example of the relationship between , TA and T_delta is shown in FIG. Figure 5 As shown, T propagation_0 It is a value obtained by adding T_delta to a value obtained by dividing TA0 between the parent node and the IAB node in half. T_delta may correspond to a value obtained by dividing the gap (Tg) of the switching time between UL reception and DL transmission at the parent node in half.

[0115] The following describes the operations related to DL and UL transmission timing when the wireless communication nodes constituting the IAB support Case#6 in addition to Case#1. When Case#6 is supported, in addition to Case#1, the UL transmission timing of the MT is consistent with the DL transmission timing of the IAB node and the child node DU.

[0116] In addition, as a premise of the operation example described later, the following contents can be assumed.

[0117] Due to the limitation of half-duplex communication, the backhaul link and access link of the IAB node apply any one of TDM / SDM / FDM. In the case of SDM or FDM, the DU and MT can send or receive at the same time.

[0118] In the case of supporting SDM / FDM using a single panel, Case#6 needs to be supported for simultaneous transmission at the IAB node, or Case#7 needs to be supported for simultaneous reception at the IAB node.

[0119] Case #1 is supported in both the transmission timing of the backhaul link and the access link.

[0120] Case #7 is supported only if it is interoperable with Release 15 UEs.

[0121] The IAB node must set the DL transmission timing to be ahead of the DL reception timing by an amount of TA / 2+T_delta.

[0122] T_delta is notified by the parent node. The value of T_delta takes into account factors such as the switching time from transmission to reception (or vice versa) and the offset between DL transmission and UL reception of the parent node due to hardware failure and the like.

[0123] TA is derived according to the specification of Release 15. TA can be interpreted as the timing gap between UL transmission timing and DL reception timing.

[0124] To adjust the DL transmission timing of the IAB node by setting the DL transmission timing of the IAB node to be (TA / 2+T_delta) ahead of the DL reception timing, T_delta must be set to (-1 / 2) of the time interval between the start of the UL reception frame i and the start of the DL transmission frame i of the IAB node at the parent node.

[0125] In addition, the following contents can be envisaged for the timing adjustment of Case#7.

[0126] ·Introduce effective negative TA and TDM between the IAB node / UE supporting the new TA value and the child IAB node / UE not supporting the new TA value.

[0127] In order to adjust the timing of DL reception and UL reception in the IAB node, the following operation may be performed.

[0128] (Alt. 1): Imports a negative time adjustment (TA) of the IAB node applied to the child nodes of the IAB node.

[0129] (Alt. 2): Positive TA that validates alignment of symbols (OFDM symbols) but invalidates alignment of slots is applied between DL reception and UL reception at the IAB node.

[0130] (Alt. 3): Perform signaling of a relative offset with respect to the most recent negative TA value applied to the child nodes of the IAB node.

[0131] The following describes an operation example of timing adjustment in Case #7 assuming (Alt. 1) or (Alt. 3).

[0132] (3.2) Action example

[0133] In the operation example described below, Over-the-Air (OTA) synchronization of the above-mentioned Case #7 (a combination of Case #1 and Case #3) is implemented between wireless communication nodes constituting the IAB.

[0134] (3.2.1) Operation overview

[0135] Regarding notification of timing information and timing-related information based on Case #3 (matching the timing of DL reception of the MT of the parent node and the timing of UL reception of the DU), the following operation can be performed.

[0136] (Action example 1): Importing negative values ​​into TA of MAC RAR

[0137] (Action Example 1-1): Add information indicating positive (+) or negative (-) (can also be 1 bit) to the TA of MAC RAR

[0138] (Action Example 1-2): Make MAC RAR's N TA Value expansion

[0139] In 3GPP Release-15 (hereinafter referred to as Release-15), 0, 1, 2, ..., 3846 are used (only positive values), but 3847 to 4095 are added by using empty bits. By subtracting this value from 3846, a negative value is set.

[0140] (Operation Example 2): Introducing an offset value relative to the TA value applied to Release-15 or Case#6 In this case, the TA value notified from the parent node to the IAB node may be any of the following.

[0141] (Alt.1): TA value of Release-15

[0142] (Alt.2): TA value applied to Case#6

[0143] (Alt.3): You can set the TA value for both Release-15 and Case#6.

[0144] In addition, as mentioned above, the TA value applied to Case #6 can mean T propagation_0 , can also mean TA / 2 or TA.

[0145] In the case of Operation Example 2, notification of the offset value with respect to the TA value may be any of the following.

[0146] (Alt.1): Follow the Release-15 mechanism to notify integer values ​​and use Tc or granularity to calculate offset values

[0147] In addition, Tc is the basic time unit for NR specified in 3GPP TS 38.211.

[0148] (Alt.2): Notify the offset value directly to the IAB node (lower node)

[0149] (Operation Example 3): Regarding Case #1 (matching the transmission timing of the DU of the parent node and the DU of the IAB node), the following operation can be performed.

[0150] (Action Example 3-1): Use T_delta specified in 3GPP Release-16 (hereinafter referred to as Release-16)

[0151] In this case, the sign of T_delta may be different from that of Release-16 (T_delta may be a value of half of the switching interval of reception and transmission at the parent node).

[0152] (Action Example 3-2): Use the timing consistency mechanism specified in 3GPP Release-16

[0153] (Action Example 4): In the case of dynamically switching between Case#1 / Case#6 / Case#7, indicate which case is applied

[0154] In addition, regarding the reception timing adjustment (alignment) in Case #7, it is possible to perform alignment at the symbol level or the slot level.

[0155] Figure 6 An example of timing alignment at the symbol level at the parent node and IAB node in Case#7 is shown. Figure 7 An example of timing alignment at the slot level at the parent node and the IAB node in Case#7 is shown. In addition, the symbol level means that the OFDM symbol transmitted and received between wireless communication nodes is used as a reference. In addition, the slot level means that the slot consisting of a predetermined number (e.g., 14) of OFDM symbols and constituting a part of a wireless frame (or subframe) is used as a reference.

[0156] like Figure 6 and Figure 7 As shown, compared with the alignment of the reception timing at the symbol level, the alignment of the reception timing at the slot level can achieve higher resource utilization, but it may also lead to a state where a negative TA is required in the IAB node.

[0157] Therefore, in the above-mentioned action example, when the slot-level timing adjustment of Case#7 is supported by the parent node, the actions associated with the signaling related to the adjustment of the UL transmission timing of the MT at the IAB node and the adjustment of the DL transmission timing of the DU at the IAB node become the main actions.

[0158] In the parent node, in order to support the slot-level timing adjustment of Case#7, the IAB node needs to set the UL transmission timing of the MT to be earlier than the DL reception timing of the MT (TA=2Tp-T1).

[0159] Figure 8 An example of alignment of timing at the time slot level at the parent node in Case #7 (including Tp and T1) is shown.

[0160] Here, Tp represents a propagation delay between a parent node and an IAB node, and T1 represents a gap between a DL transmission timing of a DU at the parent node and a DL reception timing of a MT.

[0161] In this case, TA can be set to a negative value. As described above, a negative value can be introduced into the TA of the MAC RAR, or an association can be established using signaling of a relative offset relative to the negative TA value. The following further describes in more detail the signaling actions for adjusting the UL transmission timing of the MT and the DL transmission timing of the DU at the IAB node.

[0162] (3.2.2) Action Example 1

[0163] In this operation example, a negative initial TA is introduced into the MAC RAR in the adjustment of the UL transmission timing of the MT at the IAB node. From the viewpoint of the detailed signaling design of the MAC RAR, specifically, the operation can be performed as follows.

[0164] (Action Example 1-1): Add 1 bit to indicate the negative or positive TA of MAC RAR

[0165] For example, the reserved bits of the MAC RAR specified in Release-15 can be used. Fig. 9 The following is a structural example of a random access response (Random Access Response: RAR) and a MAC-CE. Fig. 9 As shown, in Release 15, the UL frame number for transmission from a terminal (UE) starts before the start of the corresponding DL frame in the terminal.

[0166] The value (N_TA, offset) may be provided to the terminal by RRC signaling, or the terminal may determine a default value.

[0167] In the case of initial access, TA is indicated via TAC of RAR (N TA =T A ·16·64 / 2 μ T A =0, 1, 2, ..., 3846). In addition, in other cases, TA is indicated via TAC of MAC CE.

[0168] (N TA_new =N TA_old +(T A -31)·16·64 / 2 μ T A =0, 1, 2, ..., 63).

[0169] (Action Example 1-2): Use the reserved value of TA of MAC RAR

[0170] Specifically, it is possible to use TA (N TA =T A ·16·64 / 2 μ T A =0, 1, 2, ..., 3846) reserved values ​​(3847 ~ 4095) are used to represent negative TA.

[0171] In addition, when considering that the number of reserved values ​​is limited, a granularity greater than that of the TA of version 15 may be applied to negative TA. For example, the granularity may be applied as follows.

[0172] [Formula 1]

[0173] N TA negative =(3846-T A_negative )*granularity,T A_negative =3847,3848,3849,...,4095

[0174] More specifically, in order to achieve the same range as the TA specified in Release-15, the granularity may be set to be approximately 15 times the granularity of the TA of Release-15.

[0175] (3.2.3) Action Example 2

[0176] In this action example, in the adjustment of the UL transmission timing of the MT at the IAB node, an offset value indicating a relative offset relative to a negative TA value is notified. That is, if the timing adjustment of Case#7 is supported by the parent node, the IAB node can set the UL transmission timing of the MT to be earlier than the DL reception timing (TA-Toffset).

[0177] Fig.10 An example of alignment of timing at a parent node and an IAB node according to Release-15 (legacy), Case#6, and Case#7 of 3GPP is shown.

[0178] like Fig.10As shown, in the wireless communication system 10, since alignment of different timings can be performed, the TA value can be notified as follows.

[0179] ·(Alt.1):TA CASE#7 =TA legacy -Toffset

[0180] (Alt.2):TA CASE#7 =TA case#6 -Toffset

[0181] (Alt.3): Toffset is set to indicate whether it is associated with Release-15 (legacy) or Case#6. In addition, the default action can be set by TA as in Alt.1. CASE#7 =TA legacy -Toffset is defined.

[0182] In addition, Toffset can be notified via MAC CE or RRC signaling. Toffset can be expressed as follows.

[0183] (Alt. 1): Similar to the mechanism of TA in Release-15, the initial Toffset is shown, and the gap between Toffset_new and Toffset_old is shown to update Toffset.

[0184] For example, the initial Toffset is expressed as

[0185] [Formula 2]

[0186] N Toffset *T c , N Toffset =T Toffset * granularity, T Toffset =0,1,2,...,k,

[0187] The notification can be made using MAC CE or RRC signaling. In addition, the granularity can be the same as the TA of Release-15.

[0188] The update of Toffset is expressed as

[0189] [Formula 3]

[0190] Toffset=N Toffset *T c , N Toffset_new =N Toffset_old +(T Toffset -k)*granularity,

[0191] The notification may be made using MAC CE or RRC signaling. Here, k may represent the update range each time, and the granularity may be the same as that of the TA of Release 15.

[0192] (Alt.2): The offset value is shown directly

[0193] [Formula 4]

[0194] Toffset=N Toffset *T c , N Toffset =T Toffset * granularity

[0195] In this case, Toffset can be notified using MAC CE or RRC signaling.

[0196] (3.2.4) Action Example 3

[0197] In this operation example, in order to realize Case #1 (matching the transmission timing of the DU of the parent node and the DU of the IAB node), the timing matching mechanism specified in T_delta or 3GPP Release-16 is used.

[0198] Specifically, when the DL transmission timing of DUs of all associated IAB nodes is adjusted, the mechanism of Release-16 may be followed or the method for adjusting the UL transmission timing of MT in the above-mentioned Case#6 may be applied.

[0199] Alternatively, the DL transmission timing adjustment of the DU of the IAB node may be based on the UL transmission timing of the MT in Case#7. Figure 8 As shown, the IAB node can set the DL transmission timing of the DU to be ((1 / 2)*TA) ahead of the DL reception timing of the MT. Case#7 +(1 / 2)*T1).

[0200] In addition, in Release-16, the IAB node sets the DL transmission timing of the DU to be (TA / 2+T_delta) ahead of the DL reception timing of the MT at the parent node, and T_delta can be set to (-1 / 2) of the timing interval between the DL transmission timing of the DU at the parent node and the UL reception timing of the DU.

[0201] In this operation example, since the UL transmission timing of Case#7 is used as a reference and the DL transmission timing of the DU is shown, the operation can be performed as follows.

[0202] (Action Example 3-1): Reuse the T_delta of Release-16 and define the actions of different IAB nodes as Release-16

[0203] That is, the IAB node sets the DL transmission timing of the DU to be ((1 / 2)*TA) earlier than the DL reception timing of the MT. Case#7 -T_delta). T_delta can be set to (-1 / 2) of the timing interval between the DL transmission timing of the DU and the actual UL reception timing of the DU according to the UL transmission timing of the MT of the parent node in Case #7.

[0204] (Action Example 3-2): The action of the IAB node according to Release-16 is reused to define different instructions of T1.

[0205] In this case, the IAB node may set the DL transmission timing of the DU to be ((1 / 2)*TA) earlier than the DL reception timing of the MT. Case#7 -T1). Regarding T1, it can be set to (-1 / 2) of the timing interval between the DL transmission timing of the DU and the actual UL reception timing of the DU according to the UL transmission timing of the MT of the parent node in Case#7. That is, in this case, T1 can be appropriately set to a meaning different from the prescribed content of T_delta of Release-16 (the gap between the DL transmission timing of the DU at the parent node and the DL reception timing of the MT). And, in this case, T1 can be determined without relying on the installation (capability) of the wireless communication node such as the parent node.

[0206] (3.2.5) Action Example 4

[0207] In this operation example, when Case#1 / Case#6 / Case#7 are switched dynamically, which Case to apply can be explicitly or implicitly indicated from the parent node (or CU 50) to the IAB node (or child node).

[0208] As described above, Case#1 / Case#6 / Case#7 can be switched dynamically in the wireless communication system 10. In this case, the above-mentioned operation related to timing adjustment can also be switched dynamically according to the applied Case.

[0209] (Operation Example 4-1): Whether or not the timing adjustment according to Case #1, Case #6, or Case #7 is applied is explicitly indicated using downlink control information, for example, UL scheduling grant DCI.

[0210] (Operation Example 4-2): Whether or not to apply the timing adjustment according to Case #1, Case #6, or Case #7 is determined based on whether or not simultaneous transmission is performed using specific wireless resources.

[0211] Specifically, when simultaneous transmission of DU and MT is performed, it can be determined (assumed) that UL transmission timing adjustment according to Case#7 (or Case#6) is applied, and in other cases, it can be determined (assumed) that UL transmission timing adjustment according to Case#1 is applied.

[0212] (4) Function / Effect

[0213] According to the above-mentioned embodiment, the following effects can be obtained. Specifically, the wireless communication node 100A (parent node) can determine an adjustment value (negative TA) of the reception timing of the UL based on the timing information (TA) determined for the transmission timing of the UL, or an offset value relative to the TA, and send the determined adjustment value or offset value to the wireless communication node 100B (lower node).

[0214] Therefore, even when supporting Case #7, the IAB node can perform timing adjustment according to the adjustment value or offset value, and in addition to Case #1, the reception timing of DL and UL at the IAB node can be made consistent. That is, according to the wireless communication system 10, the transmission timing and reception timing of DU and MT can be reliably consistent in IAB.

[0215] In this embodiment, for example, the wireless communication node 100B (IAB node) can adjust the DL transmission timing at the upper node and the DL transmission timing at the wireless communication node 100B according to the time (T_delta) related to the switching from UL reception to DL transmission.

[0216] Therefore, even when supporting Case #7, the operation according to Case #1, specifically, the transmission timing of the DU of the parent node and the DU of the IAB node can be made to match more reliably.

[0217] In this embodiment, when adjusting the timing according to Case #7, the wireless communication node 100B (IAB node) can implicitly determine the adjustment method of the DL transmission timing and the UL reception timing based on the downlink control information (DCI) from the upper node, or the DL transmission timing and the UL reception timing.

[0218] Therefore, even when Case#1 / Case#6 / Case#7 is switched dynamically, the DL transmission timing and the UL reception timing can be made to match more reliably.

[0219] (5) Other Implementation Methods

[0220] As mentioned above, although the content of this invention was demonstrated based on an Example, this invention is not limited to these descriptions, and it is obvious to a person skilled in the art that various deformation|transformation and improvement are possible.

[0221] For example, in the above-mentioned embodiments, names such as parent node, IAB node, and child node are used, but as long as a structure of a wireless communication node is adopted in which a wireless backhaul between wireless communication nodes such as gNB and wireless access with a terminal is integrated, the names may be different. For example, it may be simply called the first node, the second node, etc., or may be called an upper node, a lower node, a relay node, an intermediate node, etc.

[0222] 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.

[0223] In the above-mentioned embodiments, the terms downlink (DL) and uplink (UL) are used, but other terms may be used. For example, the terms forward link, reverse link, access link, backhaul, etc. may be substituted or associated. Alternatively, only terms such as first link, second link, first direction, second direction, etc. may be used.

[0224] In addition, the block diagram ( Figure 3 , 4 ) shows blocks in units of functions. These functional blocks (structural parts) are implemented by any combination of at least one of hardware and software. In addition, there is no particular limitation on the implementation method of each functional block. That is, each functional block can be implemented using a device that is physically or logically combined, or two or more physically or logically separated devices can be directly or indirectly connected (for example, using wires, wirelessly, etc.) and implemented using these multiple devices. The functional block can also be implemented by combining software with the above-mentioned one device or the above-mentioned multiple devices.

[0225] Functionally, it includes judging, determining, determining, calculating, calculating, processing, deriving, investigating, searching, confirming, receiving, sending, outputting, accessing, solving, selecting, selecting, establishing, comparing, assuming, expecting, regarding, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc., but is not limited to these. For example, the functional block (structural part) that enables the transmission function is called a transmitting unit or a transmitter. In short, as mentioned above, there is no particular limitation on the implementation method.

[0226] Furthermore, the CU 50 and the wireless communication nodes 100A to 100C (the device) described above may also function as a computer for performing the processing of the wireless communication method of the present disclosure. FIG. 13 is a diagram showing an example of the hardware structure of the device. As shown in FIG. 13 , 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.

[0227] In the following description, the word "device" may be replaced by "circuit", "device", "unit", etc. The hardware structure of the device may include one or more of the devices shown in the figure, or may exclude some of the devices.

[0228] Each functional block of the device (refer to Figure 3 , 4 ) is implemented by any hardware element or combination of hardware elements of the computer device.

[0229] In addition, each function in the device is implemented by the following method: predetermined software (program) is read into hardware such as processor 1001 and memory 1002, so that processor 1001 performs calculations and controls the communication of communication device 1004 or controls at least one of the reading and writing of data in memory 1002 and storage 1003.

[0230] The processor 1001 controls the entire computer by, for example, executing an operating system. The processor 1001 may be constituted by a central processing unit (CPU) including an interface with peripheral devices, a control device, a calculation device, a register, and the like.

[0231] In addition, the processor 1001 reads a program (program code), a software module, data, etc. from at least one of the memory 1003 and the communication device 1004 to the memory 1002, and performs various processes accordingly. As a program, a program that causes a computer to perform at least a part of the actions described in the above-mentioned embodiments is used. In addition, with respect to the above-mentioned various processes, although it is described that the above-mentioned various processes are performed by one processor 1001, the above-mentioned various processes can also be performed simultaneously or sequentially by more than two processors 1001. The processor 1001 can also be installed by more than one chip. In addition, the program can also be sent from the network via a telecommunication line.

[0232] The memory 1002 is a computer-readable recording medium, and may be composed of at least one of a read-only memory (ROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), a random access memory (RAM), etc. The memory 1002 may also be referred to as a register, a cache, a main memory (main storage device), etc. The memory 1002 may store a program (program code), a software module, etc. that can execute a method according to an embodiment of the present disclosure.

[0233] The memory 1003 is a computer-readable recording medium, and may be composed of at least one of an optical disk such as a CD-ROM (Compact Disc ROM), a hard disk drive, a floppy disk, a magneto-optical disk (e.g., a compressed disk, a digital versatile disk, a Blu-ray (registered trademark) disk, a smart card, a flash memory (e.g., a card, a stick, a key drive), a Floppy (registered trademark) disk, a magnetic strip, etc. The memory 1003 may also be referred to as an auxiliary storage device. The above-mentioned recording medium may be, for example, a database, a server, and other appropriate media that includes at least one of the memory 1002 and the memory 1003.

[0234] The communication device 1004 is hardware (transceiver) used to communicate between computers via at least one of a wired network and a wireless network, and may also be called a network device, a network controller, a network card, a communication module, etc.

[0235] The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc., for example, in order to realize at least one of frequency division duplex (FDD) and time division duplex (TDD).

[0236] The input device 1005 is an input device that receives input from the outside (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.). The output device 1006 is an output device that implements output to the outside (e.g., a display, a speaker, an LED light, etc.). In addition, the input device 1005 and the output device 1006 may also be integrally formed (e.g., a touch panel).

[0237] In addition, the processor 1001 and the memory 1002 and other devices are connected via a bus 1007 for communicating information. The bus 1007 may be configured using a single bus or may be configured using different buses for each device.

[0238] In addition, the device may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), a field programmable gate array (FPGA), etc., and a part or all of each functional block may be implemented by the hardware. For example, the processor 1001 may also be installed using at least one of these hardware.

[0239] In addition, the notification of information is not limited to the form / implementation method described in the present disclosure, and other methods may also be used. For example, the notification of information may be implemented through physical layer signaling (e.g., downlink control information (Downlink Control Information: DCI), uplink control information (Uplink Control Information: UCI), high-layer signaling (e.g., RRC signaling, medium access control (Medium Access Control: MAC) signaling, broadcast information (Master Information Block: MIB, System Information Block: SIB)), other signals or a combination thereof. In addition, RRC signaling may also be referred to as an RRC message, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, etc.

[0240] Each form / embodiment described in the present 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), CDMA 2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, UWB (Ultra-WideBand), Bluetooth (registered trademark), a system using other appropriate systems, and a next-generation system extended therefrom. In addition, a combination of a plurality of systems (for example, a combination of at least one of LTE and LTE-A with 5G, etc.) may be applied.

[0241] The processing procedures, timings, processes, etc. of each form / implementation described in this disclosure may be changed in order without contradiction. For example, for the method described in this disclosure, the elements of various steps are presented in an illustrative order, but are not limited to the specific order presented.

[0242] In the present disclosure, specific actions performed by a base station are sometimes also performed by its upper node depending on the situation. In a network consisting of one or more network nodes having a base station, various actions performed to communicate with a terminal can be performed by at least one of the base station and other network nodes other than the base station (for example, consider MME or S-GW, etc., but not limited to these). In the above, the case where there is one other network node other than the base station is illustrated, but the other network node may also be a combination of multiple other network nodes (for example, MME and S-GW).

[0243] 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.

[0244] The input or output information can be stored in a specific location (e.g., memory) or managed using a management table. The input or output information can be rewritten, updated, or appended. The output information can also be deleted. The input information can also be sent to other devices.

[0245] The determination may be made by a value represented by one bit (0 or 1), by a Boolean value (Boolean: true or false), or by comparison of numerical values ​​(for example, comparison with a predetermined value).

[0246] Each form / implementation described in the present disclosure may be used alone or in combination, and may be switched according to execution. In addition, notification of scheduled information is not limited to being performed explicitly (e.g., notification of "yes X"), but may also be performed implicitly (e.g., notification of the scheduled information is not performed).

[0247] Software, whether referred to as software, firmware, middleware, microcode, hardware description language, or by other names, shall be interpreted broadly to refer to commands, sets of commands, codes, code segments, program codes, programs, subroutines, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, etc.

[0248] In addition, software, commands, information, etc. may be sent and received via a transmission medium. For example, when software is sent from a web page, server, or other remote source using at least one of wired technology (coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), etc.) and wireless technology (infrared, microwave, etc.), at least one of these wired technology and wireless technology is included in the definition of transmission medium.

[0249] The information, signals, etc. described in the present disclosure may also be represented by any of a variety of different technologies. For example, data, commands, instructions, information, signals, bits, symbols, chips, etc. that may be involved in the above description as a whole may be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any combination thereof.

[0250] In addition, the terms described in the present disclosure and the terms required for understanding the present disclosure may be replaced with terms having the same or similar meanings. For example, at least one of a channel and a symbol may also be a signal (signaling). In addition, a signal may also be a message. In addition, a component carrier (CC) may be referred to as a carrier frequency, a cell, a frequency carrier, etc.

[0251] As used in this disclosure, the terms "system" and "network" are used interchangeably.

[0252] In addition, the information, parameters, etc. described in the present disclosure may be represented by absolute values, relative values ​​to predetermined values, or other corresponding information. For example, wireless resources may also be indicated by indexes.

[0253] The names used for the above parameters are not limiting in any way. Furthermore, the formulas etc. using these parameters may sometimes differ from those explicitly disclosed in this disclosure. Various channels (e.g., PUCCH, PDCCH, etc.) and information elements may be identified by appropriate names, and therefore the various names assigned to these various channels and information elements are not limiting in any way.

[0254] In the present disclosure, the terms "base station (BS)", "wireless base station", "fixed station", "NodeB", "eNodeB (eNB)", "gNodeB (gNB)", "access point", "transmission point", "reception point", "transmission / reception point", "cell", "sector", "cell group", "carrier", "component carrier" and the like are used interchangeably. Sometimes, the base station is also referred to as macro cell, small cell, femto cell, pico cell and the like.

[0255] A base station can accommodate one or more (for example, 3) cells (also called sectors). When a base station accommodates multiple cells, the overall coverage area of ​​the base station can be divided into multiple smaller areas, and each smaller area can also provide communication services through a base station subsystem (for example, a small base station for indoor use (Remote Radio Head: RRH).

[0256] The terms "cell" or "sector" refer to a part or the entirety of a coverage area of ​​at least one of a base station and a base station subsystem that provide communication services within the coverage area.

[0257] In the present disclosure, terms such as “mobile station (MS)”, “user terminal (user terminal)”, “user equipment (UE)”, and “terminal” may be used interchangeably.

[0258] For mobile stations, those skilled in the art sometimes also use the following terms: subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other appropriate terms.

[0259] At least one of the base station and the mobile station may also be referred to as a transmitting device, a receiving device, a communication device, etc. In addition, at least one of the base station and the mobile station may be a device mounted on a mobile body, the mobile body itself, etc. The mobile body may be a means of transportation (e.g., a car, an airplane, etc.), a mobile body that moves in an unmanned manner (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). In addition, at least one of the base station and the mobile station also includes a device that does not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an IoT (Internet of Things) device such as a sensor.

[0260] In addition, the base station in the present disclosure may 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 may also be referred to as D2D (Device-to-Device), V2X (Vehicle-to-Everything, etc.), the various forms / implementations of the present disclosure may also be applied. In this case, it may also be a structure in which the mobile station has the functions of the base station. In addition, terms such as "uplink" and "downlink" may also be replaced by terms corresponding to communication between terminals (for example, "side"). For example, an uplink channel, a downlink channel, etc. may also be replaced by a side channel.

[0261] 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.

[0262] A radio frame may be composed of one or more frames in the time domain. In the time domain, one or more frames may be referred to as subframes.

[0263] A subframe may consist of one or more time slots in the time domain. A subframe may be a fixed time length (eg, 1 ms) that is independent of numerology.

[0264] A parameter set may be a communication parameter applied to at least one of the transmission and reception of a certain signal or channel. The parameter set may, for example, represent at least one of a subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), the number of symbols per TTI, a wireless frame structure, a specific filtering process performed by a transceiver in the frequency domain, a specific windowing process performed by a transceiver in the time domain, and the like.

[0265] 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.

[0266] A time slot may contain multiple mini-slots. Each mini-slot may be composed of one or more symbols in the time domain. In addition, a mini-slot may also be referred to as a sub-slot. A mini-slot may be composed of fewer symbols than a time slot. A PDSCH (or PUSCH) transmitted in units of time greater than a mini-slot may be referred to as a PDSCH (or PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot may be referred to as a PDSCH (or PUSCH) mapping type B.

[0267] A radio frame, a subframe, a time slot, a mini-time slot, and a symbol all represent time units for transmitting signals. A radio frame, a subframe, a time slot, a mini-time slot, and a symbol may be referred to by other corresponding names.

[0268] For example, 1 subframe can be called a transmission time interval (TTI), multiple consecutive subframes can also be called TTI, and 1 time slot or 1 mini time slot can also be called TTI. That is, at least one of the subframe and TTI can be a subframe (1ms) in the existing LTE, or a period shorter than 1ms (for example, 1-13 code elements), or a period longer than 1ms. In addition, the unit representing TTI can be called a time slot, a mini time slot, etc. instead of a subframe.

[0269] Here, TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in the LTE system, the base station schedules the allocation of wireless resources (frequency bandwidth, transmission power, etc. that can be used in each user terminal) to each user terminal in units of TTI. In addition, the definition of TTI is not limited to this.

[0270] TTI can be a transmission time unit of data packets (transport blocks), code blocks, code words, etc. after channel coding, or a processing unit of scheduling, link adaptation, etc. In addition, when TTI is assigned, the time interval (for example, the number of symbols) to which the transport block, code block, code word, etc. is actually mapped can be shorter than the TTI.

[0271] In addition, when 1 time slot or 1 mini time slot is called TTI, more than one TTI (ie, more than one time slot or more than one mini time slot) can constitute the minimum time unit of scheduling. In addition, the number of time slots (mini time slots) constituting the minimum time unit of scheduling can be controlled.

[0272] A TTI having a time length of 1 ms is also called a normal TTI (TTI in LTE Rel.8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, a long subframe, a time slot, etc. A TTI shorter than a normal TTI may be called a shortened TTI, a short TTI, a partial or fractional TTI, a shortened subframe, a short subframe, a mini-time slot, a sub-time slot, a time slot, etc.

[0273] In addition, for a long TTI (for example, a normal TTI, a subframe, etc.), it can be replaced with a TTI having a time length exceeding 1ms, and for a short TTI (for example, a shortened TTI, etc.), it can be replaced with a TTI length that is smaller than the long TTI (longTTI) and has a TTI length of more than 1ms.

[0274] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain. In the frequency domain, it may contain one or more consecutive subcarriers. The number of subcarriers contained in an RB may be the same regardless of the parameter set, for example, it may be 12. The number of subcarriers contained in an RB may also be determined according to the parameter set.

[0275] In addition, the time domain of an RB may include one or more symbols, and may be the length of 1 slot, 1 mini slot, 1 subframe, or 1 TTI. 1 TTI, 1 subframe, etc. may be composed of one or more resource blocks, respectively.

[0276] 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.

[0277] In addition, a resource block may be composed of one or more resource elements (RE). For example, 1 RE may be a radio resource region of 1 subcarrier and 1 symbol.

[0278] Bandwidth Part (BWP) (also called partial bandwidth, etc.) represents a subset of contiguous common RBs (common resource blocks) for a parameter set in a certain carrier. Here, the common RBs can be determined by the index of the RB based on the common reference point of the carrier. PRBs can be defined in a certain BWP and numbered within the BWP.

[0279] 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 one carrier.

[0280] At least one of the set BWPs may be active, and it is not assumed that the UE sends or receives a predetermined signal / channel outside the activated BWP. In addition, "cell", "carrier" and the like in the present disclosure may be replaced with "BWP".

[0281] The above structures of radio frames, subframes, time slots, mini-time slots, and symbols are only examples. For example, the number of subframes included in a radio frame, the number of time slots per subframe or radio frame, the number of mini-time slots included in a time slot, the number of symbols and RBs included in a time slot or mini-time slot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the cyclic prefix (CP: Cyclic Prefix) length, and the like can be changed in various ways.

[0282] The terms "connected", "coupled" or all variations of these terms are intended to indicate any direct or indirect connection or combination between two or more elements, and may include the situation where there is one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The combination or connection between elements may be a physical combination or connection, a logical combination or connection, or a combination of these. For example, "access" may be used to replace "connection". In the context of the present disclosure, for two elements, it may be considered that they are "connected" or "coupled" to each other by using at least one of one or more wires, cables, and printed electrical connections, and as some non-limiting and non-inclusive examples, by using electromagnetic energy having wavelengths in the wireless frequency domain, microwave region, and light (including both visible and invisible) region, etc.

[0283] 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.

[0284] The phrase "according to" used in the present disclosure does not mean "only according to" unless otherwise expressly stated. In other words, the phrase "according to" means both "only according to" and "at least according to".

[0285] The “unit” in the configuration of each of the above-mentioned devices may be replaced with a “section”, “circuit”, “device” or the like.

[0286] Any reference to an element using the terms "first", "second", etc. used in this disclosure does not necessarily limit the number or order of these elements. These terms are used in this disclosure as a simple method to distinguish between two or more elements. Therefore, a reference to a first and a second element does not mean that only two elements can be used here or that the first element must precede the second element in any form.

[0287] When the terms "include," "including," and variations thereof are used in the present disclosure, these terms are intended to be inclusive, as is the term "comprising." Furthermore, the term "or" used in the present disclosure does not mean an exclusive or.

[0288] In the present disclosure, when an article is added by translation, such as a, an, and the in English, for example, the present disclosure also includes a case where the noun following the article is in a plural form.

[0289] The terms "determining" and "determining" used in this disclosure sometimes include a variety of actions. "Determining" and "determining" may include, for example, considering matters that have been judged, calculated, calculated, processed, derived, investigated, searched (for example, searched in a table, database or other data structure), confirmed (ascertaining) as matters that have been "judged" or "determined", etc. In addition, "determining" and "determining" may include matters that have been received (for example, receiving information), transmitted (for example, sending information), input, output, accessed (for example, accessing data in memory) as matters that have been "judged" or "determined", etc. In addition, "determining" and "determining" may include matters that have been resolved (resolving), selected (selecting), chosen (choosing), established (establishing), compared (comparing), etc. as matters that have been "judged" or "determined". That is, "judgment" and "determination" may include matters that are considered to be "judgmented" and "determined". In addition, "judgment (determination)" may also be replaced by "assuming", "expecting", "considering", etc.

[0290] In the present disclosure, the term "A and B are different" may also mean "A and B are different from each other". In addition, the term may also mean "A and B are different from C, respectively". The terms "separate" and "combined" may also be interpreted in the same way as "different".

[0291] The present disclosure is described in detail above, but it should be clear to those skilled in the art that the present disclosure is not limited to the embodiments described in the present disclosure. The present disclosure can be implemented as a modification and variation without departing from the subject matter and scope of the present disclosure as determined by the claims. Therefore, the purpose of the description of the present disclosure is to illustrate and not to have any limiting meaning on the present disclosure.

[0292] Description of symbols

[0293] 10: Wireless communication system;

[0294] 50: CU;

[0295] 100A, 100B, 100C: wireless communication nodes;

[0296] 110: wireless transmission unit;

[0297] 120: wireless receiving unit;

[0298] 130: NW IF Department;

[0299] 140: Control Department;

[0300] 150: timing-related information sending unit;

[0301] 161: wireless transmission unit;

[0302] 162: wireless receiving unit;

[0303] 165: downlink control information receiving unit;

[0304] 170: Control Department;

[0305] UE: 200;

[0306] 1001: processor;

[0307] 1002: Memory;

[0308] 1003: memory;

[0309] 1004: Communication devices;

[0310] 1005: input device;

[0311] 1006: output device. 1007: bus.

Claims

1. A wireless communication node, comprising: a control unit that, when Case #7 of adjusting the transmission timing of the downlink from the wireless communication node and the reception timing of the uplink in the wireless communication node is used, determines the transmission timing of the uplink from the wireless communication node using the timing information used in determining the transmission timing of the uplink from the user terminal and the offset value with respect to the timing information; and A transmitting unit transmits an uplink from the wireless communication node based on the determined transmission timing of the uplink.

2. The wireless communication node according to claim 1, wherein: The control unit obtains the offset value using a control element of a medium access control layer.

3. The wireless communication node according to claim 1, wherein: The control unit determines the uplink transmission timing in the IAB-MT function.

4. The wireless communication node according to claim 1, wherein: The control unit applies granularity to the offset value and determines the uplink transmission timing.

5. A communication method in a wireless communication node, comprising the following steps: When Case #7 of adjusting the transmission timing of the downlink from the wireless communication node and the reception timing of the uplink in the wireless communication node is used, determining the transmission timing of the uplink from the wireless communication node using the timing information used in determining the transmission timing of the uplink from the user terminal and the offset value with respect to the timing information; and Based on the determined transmission timing of the uplink, an uplink from the wireless communication node is transmitted.

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