Wireless communication node

Abstract

This wireless communication node (100B) comprises: a cell information acquisition unit (165) which acquires a set subcarrier interval and a frequency range to be used; and a control unit (170) which, on the basis of the subcarrier interval and frequency range, sets a reference addition time included in a time difference from the transmission in a serving cell to the reception in the wireless communication node and a particle size applied to the reference addition time.

Description

[Technical Field]

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

[0002] The 3rd Generation Partnership Project (3GPP) has specified Long Term Evolution (LTE) and is also working on specifications for LTE-Advanced (hereinafter, LTE-Advanced will be referred to as LTE) with the aim of further increasing the speed of LTE, as well as the 5th generation mobile communication system (5G, also known as New Radio (NR) or Next Generation (NG)).

[0003] For example, 3GPP Release-16 specifies that the NR radio access network (RAN) must support Integrated Access and Backhaul (IAB), which integrates wireless access to terminals (User Equipment, UE) and wireless 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 Termination (MT), which is a function for connecting with a parent node (which may also be called an IAB donor), and a Distributed Unit (DU), which is a function for connecting with a child node or UE.

[0005] In addition, in 3GPP Release-16, an additional time (T delta ) are specified (see Non-Patent Document 2).

[0006] Furthermore, T deltaA control element (CE) of the medium access control layer (MAC) that notifies the index (0, 1, 2, ..., 1199) of the above has also been proposed (see Non-Patent Document 3). [Prior art documents] [Non-patent literature]

[0007] [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 [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 [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

[0008] However, appropriate T delta The value of may vary depending on the subcarrier spacing (SCS) set in the serving cell and the frequency range (FR) used in the serving cell.

[0009] For this reason, wireless communication nodes such as IAB nodes do not necessarily delta It may not be possible to predict.

[0010] Therefore, the following disclosure has been made in consideration of such a situation, and the additional time (T delta The present invention aims to provide a wireless communication node that can always properly set the following:

[0011] One aspect of the present disclosure is a wireless communication node (wireless communication node 100B) that includes an acquisition unit (cell information acquisition unit 165) that acquires the subcarrier spacing to be set and the frequency range to be used, and a control unit (control unit 170) that sets the reference additional time included in the time difference from transmission in a serving cell to reception in the wireless communication node and the granularity to be applied to the reference additional time based on the subcarrier spacing and the frequency range.

[0012] One aspect of the present disclosure is a wireless communication node (wireless communication node 100B) that includes a receiving unit (wireless receiving unit 162) that receives a control element indicating an index of an additional time included in the time difference between transmission in a serving cell and reception in the wireless communication node, and a control unit (control unit 170) that sets the number of bits representing the index based on at least one of a set subcarrier spacing and a frequency range.

[0013] One aspect of the present disclosure is a wireless communication node (wireless communication node 100B) that includes a receiving unit (wireless receiving unit 162) that receives a control element including an index of an additional time included in the time difference between transmission in a serving cell and 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 one of a set subcarrier spacing and a frequency range.

[0014] One aspect of the present disclosure is a wireless communication node (wireless communication node 100B) that includes a receiving unit (wireless receiving unit 162) that receives a control element including an index of an additional time included in the time difference between transmission in a serving cell and 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 explanation of the drawings]

[0015] [Figure 1] FIG. 1 is a diagram showing the overall schematic configuration of a wireless communication system 10. As shown in FIG. [Figure 2] FIG. 2 is a diagram showing an example of the basic configuration of the IAB. [Figure 3] FIG. 3 is a functional block diagram of the wireless communication node 100B. [Figure 4A] FIG. 4A is a diagram illustrating a configuration example (part 1) of a Tdelta MAC-CE. [Figure 4B] FIG. 4B is a diagram illustrating a configuration example (part 2) of a Tdelta MAC-CE. [Figure 5] FIG. 5 is a diagram illustrating an example of the hardware configuration of the CU 50 and the wireless communication nodes 100A to 100C. DETAILED DESCRIPTION OF THE INVENTION

[0016] Hereinafter, embodiments will be described with reference to the drawings. Note that the same or similar reference numerals are used to designate the same functions or configurations, and descriptions thereof will be omitted as appropriate.

[0017] (1) Overall configuration of wireless communication system 1 is a diagram showing an overall schematic configuration of a wireless communication system 10 according to this embodiment. The wireless communication system 10 is a wireless communication system conforming to 5G New Radio (NR), and is configured by a plurality of wireless communication nodes and terminals.

[0018] Specifically, the wireless communication system 10 includes wireless communication nodes 100A, 100B, and 100C, and a terminal 200 (hereinafter referred to as UE 200, User Equipment).

[0019] The wireless communication nodes 100A, 100B, and 100C can establish wireless access with the UE 200 and wireless backhauls (BH) between the wireless communication nodes. Specifically, backhauls (transmission paths) are established by wireless links between the wireless communication nodes 100A and 100B, and between the wireless communication nodes 100A and 100C.

[0020] Such a configuration in which the wireless access to the UE 200 and the wireless backhaul between the wireless communication nodes are integrated is called Integrated Access and Backhaul (IAB).

[0021] The IAB reuses existing functions and interfaces defined for radio 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.

[0022] The wireless communication node 100A is connected to an NR radio access network (NG-RAN) and a core network (Next Generation Core (NGC) or 5GC) via a wired transmission path such as fiber transport. The NG-RAN / NGC includes a Central Unit 50 (hereinafter, CU50), which is a communication node. The NG-RAN and NGC may be collectively referred to simply as the "network."

[0023] The CU 50 may be configured using any one or a combination of the UPF, AMF, and SMF described above, or may be a gNB-CU as described above.

[0024] Fig. 2 is a diagram showing a basic configuration example of an IAB. As shown in Fig. 2, 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) constitutes an IAB node in the IAB. The parent node may also be called an IAB donor or an upper node.

[0025] A child node in the IAB is configured by another wireless communication node not shown in Fig. 1. Alternatively, the UE 200 may configure the child node.

[0026] A wireless link is established between the parent node and the IAB node. Specifically, a wireless link called Link_parent is established.

[0027] A wireless link is established between the IAB node and the child node. Specifically, a wireless link called Link_child is established.

[0028] A wireless link established between such wireless communication nodes is called a wireless backhaul link. Link_parent is composed of a DL Parent BH in the downlink (DL) direction and a UL Parent BH in the uplink (UL) direction. Link_child is composed of a DL Child BH in the DL direction and a UL Child BH in the UL direction.

[0029] That is, in IAB, the direction from a parent node to a child node (including UE 200) is the DL direction, and the direction from a child node to a parent node is the UL direction.

[0030] The radio link established between the UE 200 and the IAB node or parent node is called a radio access link. Specifically, the radio link is configured by a DL access in the DL direction and a UL access in the UL direction.

[0031] The IAB node has a Mobile Termination (MT) that is a function for connecting to a parent node, and a Distributed Unit (DU) that is a function for connecting to a child node (or UE 200). The child node may also be called a lower node.

[0032] Similarly, the parent node has an MT for connecting to a higher-level node and a DU for connecting to a lower-level node such as an IAB node. Note that the parent node may have a CU (Central Unit) instead of an MT.

[0033] Similarly to the IAB node and parent node, the child node also has an MT for connecting to a higher-level node such as the IAB node, and a DU for connecting to a lower-level node such as the UE 200.

[0034] From the DU's point of view, the radio resources used by the DU, such as DL, UL, and Flexible time-resource (D / U / F), are classified into one of the following types: Hard, Soft, or Not Available (H / S / NA). Also, even within Soft (S), available or not available is specified.

[0035] Although the IAB configuration example shown in Fig. 2 uses CU / DU division, the IAB configuration is not necessarily limited to this configuration. For example, the IAB may be configured by tunneling using GPRS Tunneling Protocol (GTP)-U / User Datagram Protocol (UDP) / Internet Protocol (IP) for the wireless backhaul.

[0036] The main advantage of such IAB is that it allows flexible and dense deployment of NR cells without densifying the transport network. IAB can be applied to various scenarios, such as outdoor small cell deployment, indoor deployment, and even support for mobile relay (e.g., in buses and trains).

[0037] The IAB may also support NR-only standalone (SA) deployments, as shown in Figures 1 and 2, or non-standalone (NSA) deployments that include other RATs (such as LTE).

[0038] In this embodiment, the wireless access and wireless backhaul operate under the assumption of half-duplex communication. However, this is not necessarily limited to half-duplex communication, and full-duplex communication may also be used as long as the requirements are met.

[0039] Additionally, time division multiplexing (TDM), space division multiplexing (SDM), and frequency division multiplexing (FDM) are available as multiplexing methods.

[0040] When an IAB node operates in half-duplex communication, the DL Parent BH is the receiving (RX) side, the UL Parent BH is the transmitting (TX) side, the DL Child BH is the transmitting (TX) side, and the UL Child BH is the receiving (RX) side. Also, in the case of Time Division Duplex (TDD), the DL / UL configuration pattern in the IAB node is not limited to DL-F-UL only, and configuration patterns such as wireless backhaul (BH) only, UL-F-DL, etc. may be applied.

[0041] In addition, in 3GPP Release-16, in order to determine the DU transmission timing of an IAB node, Equation 1 is specified as the time difference between the DU transmission of a parent node and the MT reception of an IAB node.

[0042]

number

[0043] Specifically, (Equation 1) is defined in Chapter 14 of 3GPP TS38.213 and Chapter 7.1.2 of TS38.133. TA is originally a value of Timing Advance (TA) for determining the transmission timing of a signal in the UL of UE 200, etc. TA can take on values ​​0, 1, 2,...,3846.

[0044] N TA,offset is specified in Chapter 7.1.2 of TS38.133, and c The value is in units of N. TA,offset may vary depending on the frequency range (FR) and communication method (TDD, Frequency Division Duplex (FDD)).

[0045] The wireless communication system 10 supports FR1 and FR2. The frequency bands of each FR are as follows:

[0046] FR1: 410 MHz to 7.125 GHz FR2: 24.25 GHz~52.6 GHz FR1 may use a Sub-Carrier Spacing (SCS) of 15, 30, or 60 kHz, and may use a bandwidth (BW) of 5 to 100 MHz. FR2 is a higher frequency than FR1, and may use an SCS of 60 or 120 kHz (which may include 240 kHz), and may use a bandwidth (BW) of 50 to 400 MHz. Note that the wireless communication system 10 may support other FRs, such as a frequency band higher than FR2.

[0047] The wireless communication node (including the UE 200) determines the N based on the n-TimingAdvanceOffset, which is a field included in an information element (IE) of an upper layer, specifically, a radio resource control layer (RRC). TA,offset can be set.

[0048] T c is a basic time unit in NR (5G) and is specified in Chapter 4.1 of 3GPP TS38.211. Specifically, (Equation 2) is specified.

[0049]

number

[0050] (Δf max is 480·10 3 Hz. Also, N f is 4096. Therefore, T c is 0.509ns.

[0051] T delta can be interpreted as the additional time added as the time difference defined by (Equation 1). delta is also written as T_delta as appropriate.

[0052] The time difference defined by (Equation 1) may be defined as the time difference between DU transmission and MT reception, as described above. delta For example, T may be determined in consideration of the time required for switching from reception to transmission at the parent node, or may be set to a value approximately half the time required for switching from reception to transmission at the parent node. delta The value of is variable.

[0053] The IAB node can use the time difference defined by (Equation 1) to determine the transmission timing of the DU.

[0054] In addition, the TA can be transmitted using a TA command in a Random Access Response (RAR) or a Medium Access Control-Control Element (MAC-CE). In this embodiment, the TA can be transmitted using a TA command in a Random Access Response (RAR) or a Medium Access Control-Control Element (MAC-CE). delta MAC-CE is used to notify the above.

[0055] Specifically, T delta A MAC-CE including a field indicating the index (0, 1, 2, ..., 1199) of the MAC-CE is used. The configuration of the MAC-CE will be described in more detail later.

[0056] (2) Functional block configuration of wireless communication system Next, the functional block configuration of the wireless communication node 100B that constitutes the wireless communication system 10 will be described.

[0057] 3 is a functional block diagram of a radio communication node 100B constituting an IAB node. As shown in FIG. 3, the radio communication node 100B includes a radio transmitting unit 161, a radio receiving unit 162, a cell information acquiring unit 165, and a control unit 170.

[0058] The wireless transmission unit 161 transmits a wireless signal conforming to the 5G specifications. Also, the wireless reception unit 162 transmits a wireless signal conforming to the 5G specifications. 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 a child node (including the UE 200).

[0059] The wireless receiving unit 162 can also 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 receiving unit 162 constitutes a receiving unit.

[0060] Specifically, the radio reception unit 162 calculates the time difference between the DU transmission of the radio communication node 100A (parent node) forming the serving cell and the MT reception of the IAB node by using T delta MAC-CE(T delta It can receive the MAC-CE.

[0061] As described above, the serving cell may be interpreted as the parent node (wireless communication node) of the IAB or as a gNB (radio base station). Alternatively, the serving cell may simply be interpreted as a cell to which the IAB node is connected. More precisely, in the case of an RRC_CONNECTED UE (wireless communication node) in which carrier aggregation (CA) is not configured, there is only one serving cell that constitutes the primary cell. In the case of an RRC_CONNECTED UE (wireless communication node) configured using CA, the serving cell may be interpreted as a set of one or more cells including the primary cell and all secondary cells.

[0062] The cell information acquisition unit 165 acquires information about a cell formed by a parent node, etc. In this embodiment, the cell information acquisition unit 165 constitutes an acquisition unit.

[0063] Specifically, the cell information acquisition unit 165 can acquire the subcarrier spacing (SCS) set for radio signals transmitted and received in the cell. Also, the cell information acquisition unit 165 can acquire the frequency range (FR) used in the serving cell.

[0064] The cell information acquisition unit 165 may receive, for example, downlink control information (DCI) and acquire the above-mentioned SCS and FR based on the received DCI. Information indicating the SCS and FR (frequency band) may be interpreted as BWP: Bandwidth part. The DCI can be transmitted from the network to an IAB node or the like via a PDCCH (Physical Downlink Control Channel).

[0065] The channels include control channels and data channels, such as a physical downlink control channel (PDCCH), a physical uplink control channel (PUCCH), a physical random access channel (PRACH), and a physical broadcast channel (PBCH).

[0066] The data channels include a physical downlink shared channel (PDSCH) and a physical uplink shared channel (PUSCH).

[0067] The signal may include a channel and a reference signal, such as 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). Furthermore, data may refer to data transmitted via a data channel.

[0068] The control unit 170 controls each functional block that configures the wireless communication node 100 B. In particular, in this embodiment, the control unit 170 controls the above-mentioned time difference (see Equation 1).

[0069] Specifically, the control unit 170 calculates the reference additional time (T delta_o ), and T delta_o More specifically, the control unit 170 can set the granularity to be applied to the time difference between the transmission in the serving cell and the reception in the wireless communication node 100B based on the SCS and FR of the serving cell. delta_o In addition to setting T delta_o You can set the granularity that applies to the

[0070] The control unit 170 delta_o Also, a common value may be set for at least one of the granularities regardless of SCS and FR. delta_o Furthermore, at least one of the granularities may be fixed and not changed depending on the SCS and FR.

[0071] More specifically, T delta_o Only fixed, only fixed granularity, or T delta_o Both the frequency and granularity may be common (fixed) regardless of SCS and FR.

[0072] Furthermore, the control unit 170 determines whether T delta index(T delta You can set the number of bits to represent the index.

[0073] Specifically, the control unit 170 delta In MAC-CE, T deltaThe number of bits representing the index can be set to 11 or 12. Whether to set 11 or 12 bits may be predefined by the network or may be based on notification from the network. The notification from the network may be signaling of a lower layer such as DCI, or signaling of a higher layer such as RRC.

[0074] Furthermore, the control unit 170 determines the T to be read based on at least one of the SCS and FR. delta The number of bits in the index may be set.

[0075] For example, T delta In MAC-CE, T delta Even if 11 bits are assigned to represent the index, the T to be read can be determined based on at least one of the SCS and FR. delta The number of bits of the index can be changed to 10 bits or 9 bits. delta An example of setting the number of bits of the index will be described later.

[0076] Alternatively, the control unit 170 may select the T to be read regardless of the SCS and FR. delta In other words, the control unit 170 may set the number of bits of the index to be read regardless of the settings of SCS and FR. delta The number of bits of the index (read range) may be constant (fixed). delta The number of bits of the index may be fixed at 11 bits.

[0077] (3) Operation of the wireless communication system Next, a description will be given of the operation of the wireless communication system 10. Specifically, a description will be given of the operation relating to setting of the time difference from the DU transmission of the parent node to the MT reception of the IAB node in the wireless communication system 10.

[0078] (3.1) Premise First, T delta And, T delta The mapping with the index can be expressed as follows:

[0079] T delta_value = T delta_o + T delta index*granularity, or T delta_value = T delta_o -T delta index*granularity In addition, T delta_value As mentioned above, the value (T delta may mean the value of

[0080] In addition, T delta_o The (reference additional time) and granularity may be defined in advance by the 3GPP specifications.

[0081] (3.2) Operation overview In the following, the IAB node selects the appropriate T according to the SCS and FR. delta The operation of setting the above will be described.

[0082] (Example 1):T delta_o and granularity settings (Alt. 1):T delta_o and granularity are predefined for each SCS, FR (e.g., FR1, FR2) or SCS and FR.

[0083] The IAB node determines the T according to the SCS and FR of the serving cell. delta_o and set the granularity value.

[0084] (Alt. 2):T delta_o For , a value for each SCS and FR is defined in advance, and for granularity, a common value is defined in advance regardless of SCS or FR.

[0085] The IAB node determines the T according to the SCS and FR of the serving cell. delta_o Set the value of .

[0086] (Alt. 3): For granularity, the values ​​for SCS and FR are predefined. delta_o A common value is defined in advance for regardless of SCS or FR.

[0087] The IAB node sets the granularity value according to the SCS and FR of the serving cell.

[0088] (Alt. 4):T delta_o For granularity, common values ​​are defined in advance regardless of SCS or FR.

[0089] In this case, regardless of the SCS and FR of the serving cell, T delta_o and granularity are unique values. delta 12 bits are required for the index. delta Some of the reserved bits of MAC-CE are used.

[0090] (Example 2):T delta Set the number of index bits (11 / 12 bits) ·(Alt. 1): Change the number of bits for each SCS, FR, or SCS and FR.

[0091] ·(Alt. 2): Set a fixed number of bits regardless of SCS or FR.

[0092] In this case, the IAB node will delta You can set the index read range.

[0093] (Alt. 3): Number of bits and T by IAB node delta The index reading range is fixed regardless of SCS or FR.

[0094] (3.3) Example 1 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 may be in SCS units, granularity in FR units, or any combination.

[0095] The IAB node determines the T according to the SCS, FR, or SCS and FR of the serving cell. delta_o and granularity may apply.

[0096] Table 1 shows the T according to (Alt. 1) delta_o An example of setting granularity is shown below.

[0097] [Table 1]

[0098] In the case of Table 1, T delta_o is based on the minimum value, and T delta_value may be calculated as follows:

[0099] T delta_value = T delta_o + T delta index*granularity In addition, the values ​​in Table 1 (T delta_o and granularity) are merely examples, and other values ​​may be set.

[0100] Table 2 shows other Ts according to (Alt. 1). delta_o An example of setting granularity is shown below.

[0101] [Table 2]

[0102] In the case of Table 2, T delta_o is based on the maximum value, and T delta_value may be calculated as follows:

[0103] T delta_value = T delta_o -T delta index*granularity The values ​​in Table 2 (T delta_o and granularity) are merely examples, and other values ​​may be set.

[0104] Also, as mentioned above, in the case of (Alt. 2), T delta_o For granularity, a value for each SCS and FR is predefined, and for granularity, a common value is predefined regardless of SCS and FR. In this case, the IAB node determines T according to the SCS, FR, or SCS and FR of the serving cell. delta_o Set the value of .

[0105] For example, in the example (Alt. 1), the granularity is 32*T c It may be predefined as follows. delta_o Other values ​​may be set for the parameter and granularity.

[0106] Also, as mentioned above, in the case of (Alt. 3), the granularity is defined in advance for each SCS and FR. delta_o A common value is defined in advance for granularity regardless of SCS or FR. In this case, the IAB node sets the value of granularity according to the SCS, FR, or SCS and FR of the serving cell.

[0107] For example, as in the example (Alt. 1), T delta_o may be set as follows:

[0108] T delta_o = N TA,offset / 2 - 70528, T delta_value = T delta_o -T deltaindex*granularity, or T delta_o = N TA,offset / 2 + 6256, T delta_value = T delta_o -T delta index*granularity In addition, T delta_o Other values ​​may be set for the parameter and granularity.

[0109] Also, as mentioned above, in the case of (Alt. 4), T delta_o For granularity, common values ​​are defined in advance regardless of SCS or FR. (Alt. 4) defines T for all SCS and FR. delta MAC-CE T delta index and T delta_value This is an integrated mapping.

[0110] (Alt. 4) for all T delta To represent the index, 12 bits are required.

[0111] Figure 4A shows the T delta 4B shows an example of the MAC-CE configuration (part 1). delta An example of MAC-CE configuration (part 2) is shown below.

[0112] T delta The MAC-CE configuration example (part 1) is shown in Non-Patent Document 3 (R2-2002405). delta As shown in Figure 4A, 3 bits of Octet 1 and 8 bits (all bits) of Octet 2, that is, a total of 11 bits, are used for the T delta It is allocated for indexing.

[0113] On the other hand, in FIG. 4B, one reserved bit (R) is added to octet 1 to make it 12 bits.

[0114] In addition, in the case of (Alt. 4), as in the case of (Alt. 3), T delta_o may be set as follows:

[0115] T delta_o = N TA,offset / 2 - 70528, T delta_value = T delta_o -T delta index*granularity, or T delta_o = N TA,offset / 2 + 6256, T delta_value = T delta_o -T delta index*granularity Also, like (Alt. 2), the granularity is 32*T c It may be predefined as follows. delta_o Other values ​​may be set for the parameter and granularity.

[0116] (3.4) Example 2 As explained in Operation Example 1, T delta MAC-CE (see Figures 4A and 4B) delta The length (number of bits) of the index bit field can be 11 bits, 12 bits, or other values ​​(for example, 10 bits).

[0117] Here, IAB node T delta index value (T delta_value The number of bits that are meaningful (i.e., necessary) to determine the T delta The range of index may vary depending on the SCS, FR, or SCS and FR of the serving cell.

[0118] IAB node T delta The number of bits that are significant for determining the value of index and T delta Considering the allowable range of the index, as mentioned above, there are options (Alt. 1) to (Alt. 3).

[0119] (Alt. 1) if meaningful T delta The number of bits in the index may vary for each SCS, FR, or SCS and FR. delta The allowable range of the index may also vary for each SCS, FR, or SCS and FR. Note that the number of bits may differ for each SCS, and the allowable range may differ for each FR, and any combination of the number of bits, allowable range, SCS, and FR may be used.

[0120] In case of (Alt. 1), the IAB node selects a meaningful T according to the SCS, FR, or SCS and FR of the serving cell. delta Determines the number of bits in the index.

[0121] Table 3 shows the meaning of T according to (Alt. 1). delta The number of bits in the index and T delta An example of setting the allowable range for index is shown below.

[0122] [Table 3]

[0123] For example, if FR1 is used and the SCS is 15 kHz, the IAB node delta The number of index bits is set to 11. That is, the IAB node delta Based on the contents of the most or least significant 11 bits of the MAC-CE, delta Determine the index.

[0124] Also, for example, if FR1 is used and SCS is 30 kHz, the IAB node is a meaningful T delta Set the number of index bits to 10. That is, IAB nodes can use T delta Based on the contents of the most or least significant 10 bits of the MAC-CE, delta Determine the index.

[0125] In this case, the IAB node may ignore the remaining other bits, or may expect the other bits to be set to default values ​​(e.g., 0 or 1), or may expect them to be used for other purposes.

[0126] In addition, the T assumed by the IAB node delta The allowable range of the index may vary for each SCS, FR, or SCS and FR. For example, if FR1 is used and the SCS is 15 kHz, the IAB node can be set to (0,1199), i.e., T from 0 to 1199. delta An index may be assumed.

[0127] Also, for example, when FR1 is used and SCS is 30 kHz, the IAB node is (0,674), that is, T delta An index may be assumed.

[0128] The values ​​shown in Table 3 are merely examples, and other values ​​may be set. delta The number of bits in the index and T delta The allowable range of index is the T delta_o In other words, the above-described examples of the number of bits and the tolerance range may be based on the assumption of (Alt. 1) in Operation Example 1.

[0129] (Alt. 2) in the case of meaningful T delta The number of bits in the index is constant across all SCSs and FRs. delta The allowable range of the index may be set for each SCS, FR, or SCS and FR.

[0130] Table 4 shows the meaning of T according to (Alt. 2). delta The number of bits in the index and T delta An example of setting the allowable range for index is shown below.

[0131] [Table 4]

[0132] As shown in Table 4, meaningful T delta The number of bits of the index is fixed at 11 bits regardless of SCS and FR. delta MAC-CE T delta It has the same length as the index bit field.

[0133] On the other hand, as shown in Table 4, the T assumed by the IAB node delta The allowable range of the index may vary for each SCS, FR, or SCS and FR. For example, if FR1 is used and the SCS is 15 kHz, the IAB node can be set to (0,1199), i.e., T from 0 to 1199. delta An index may be assumed.

[0134] Also, for example, when FR1 is used and SCS is 30 kHz, the IAB node is (0,674), that is, T delta An index may be assumed.

[0135] The values ​​shown in Table 4 are also examples, and other values ​​may be set. delta The number of bits in the index and T delta The allowable range of index is the T delta_o In other words, the above-described examples of the number of bits and the tolerance range may be based on the assumption of (Alt. 1) in Operation Example 1.

[0136] (Alt. 3) in the case of meaningful T delta The number of bits of the index is constant for all SCSs and FRs. delta The acceptable range of the index is also constant across all SCSs and FRs.

[0137] (Alt. 3) in the case of meaningful T delta The number of bits of the index is fixed regardless of the SCS and FR, and may be, for example, 11 bits.delta The allowable range of index is also fixed regardless of SCS and FR. For example, IAB node is (0,1199), that is, T from 0 to 1199. delta An index may be assumed.

[0138] In the case of (Alt. 3), the numerical value is just an example, and other values ​​may be set. delta The number of bits in the index and T delta The allowable range of index is the T delta_o In other words, the above-mentioned examples of the number of bits and the allowable range may be based on the assumption of the first operational example.

[0139] (4) Actions and Effects According to the above-described embodiment, the following advantageous effects can be obtained. Specifically, the radio communication node 100B (IAB node) calculates, based on the SCS and FR of the serving cell, T included in the time difference between transmission in the serving cell and reception in the radio communication node 100B. delta_o In addition to setting T delta_o You can set the granularity that applies to the

[0140] Therefore, appropriate T is determined according to the SCS and FR of the serving cell. delta The value of (T delta_value ) changes, the wireless communication node 100B can obtain an appropriate T delta As a result, the wireless communication node 100B can assume that T delta This can contribute to more efficient utilization of radio resources and improvement of communication quality in the entire radio communication system 10.

[0141] In this embodiment, the wireless communication node 100B is delta_o In addition, a common value can be set for at least one of the granularities regardless of SCS and FR. delta_oFurthermore, if the granularity 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.

[0142] In this embodiment, the wireless communication node 100B determines T based on at least one of the SCS and FR of the serving cell. delta In this embodiment, the wireless communication node 100B can set the number of bits that represent the index. delta You can also set the number of bits in the index.

[0143] Therefore, appropriate T is determined according to the SCS and FR of the serving cell. delta The value of (T delta_value ) changes, the wireless communication node 100B can obtain an appropriate T delta As a result, the wireless communication node 100B can assume that T delta This can contribute to more efficient utilization of radio resources and improvement of communication quality in the entire radio communication system 10.

[0144] Furthermore, the wireless communication node 100B reads the T regardless of the SCS and FR of the serving cell. delta In other words, the wireless communication node 100B can set the number of bits of the index to be read regardless of the SCS and FR of the serving cell. delta The number of bits of the index can be constant (fixed).

[0145] For this reason, T delta If 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.

[0146] (5) Other embodiments Although the embodiments have been described above, it will be obvious to those skilled in the art that the present invention is not limited to the description of the embodiments and that various modifications and improvements are possible.

[0147] For example, in the above-described embodiment, the names of parent node, IAB node, and child node are used, but as long as a wireless communication node configuration in which wireless backhaul between wireless communication nodes such as gNBs and wireless access with terminals are integrated is adopted, the names may be different. For example, they may be simply called first and second nodes, or may be called upper nodes, lower nodes, relay nodes, intermediate nodes, etc.

[0148] Furthermore, the wireless communication node may simply be called a communication device or a communication node, or may be read as a wireless base station.

[0149] Furthermore, in the above-described embodiment, T delta is the additional time, T delta_o is expressed as a reference additional time, but the term additional time may be interpreted as other terms, such as a predetermined time or an infinitesimal time. Also, the term granularity may be interpreted as other terms, such as coarseness, step, level, etc.

[0150] In the above-described embodiment, 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, terms such as first link, second link, first direction, and second direction may simply be used.

[0151] The block diagram (FIG. 3) used in the description of the above-described embodiment shows functional blocks. These functional blocks (components) are realized by any combination of at least one of hardware and software. The method for realizing each functional block is not particularly limited. That is, each functional block may be realized using a single device that is physically or logically coupled, or may be realized using two or more physically or logically separated devices that are connected directly or indirectly (for example, by wire, wirelessly, etc.) and these multiple devices. The functional block may be realized by combining the single device or multiple devices with software.

[0152] Functions include, but are not limited to, judgment, determination, judgment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, election, establishment, comparison, assumption, expectation, consideration, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assignment. For example, a functional block (component) that performs transmission is called a transmitting unit or transmitter. As mentioned above, there are no particular limitations on how each is implemented.

[0153] Furthermore, the above-described CU 50 and the wireless communication nodes 100A to 100C (the devices) may function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 5 is a diagram showing an example of the hardware configuration of the devices. As shown in Fig. 5, the devices may be configured as a computer including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0154] In the following description, the term "apparatus" can be interpreted as a circuit, a device, a unit, etc. The hardware configuration of the apparatus may be configured to include one or more of the apparatuses shown in the drawings, or may be configured to exclude some of the apparatuses.

[0155] Each functional block of the wireless communication node 100B (see FIG. 3) is realized by any hardware element of the computer device or a combination of the hardware elements.

[0156] In addition, each function of the device is realized by loading specified software (programs) onto hardware such as processor 1001 and memory 1002, causing processor 1001 to perform calculations, control communication via communication device 1004, and control at least one of reading and writing data in memory 1002 and storage 1003.

[0157] The processor 1001 controls the entire computer by running, for example, an operating system, and may be configured as a central processing unit (CPU) including an interface with peripheral devices, a control unit, an arithmetic unit, a register, and the like.

[0158] The processor 1001 also reads programs (program codes), software modules, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and executes various processes in accordance with these. The programs used are those that cause a computer to execute at least some of the operations described in the above-mentioned embodiments. Furthermore, the various processes described above may be executed by one processor 1001, or may be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 may be implemented by one or more chips. The programs may be transmitted from a network via a telecommunications line.

[0159] The memory 1002 is a computer-readable recording medium and may be configured by, for example, at least one of a read-only memory (ROM), an erasable programmable ROM (EPROM), an electrically erasable programmable ROM (EEPROM), a random access memory (RAM), etc. The memory 1002 may also be called a register, a cache, a main memory (primary storage device), etc. The memory 1002 can store a program (program code), a software module, etc., that can execute a method according to an embodiment of the present disclosure.

[0160] Storage 1003 is a computer-readable recording medium, and may be, for example, at least one of an optical disk such as a Compact Disc ROM (CD-ROM), a hard disk drive, a flexible disk, a magneto-optical disk (e.g., a compact disk, a digital versatile disk, a Blu-ray disc), a smart card, a flash memory (e.g., a card, a stick, a key drive), a floppy disk, a magnetic strip, etc. Storage 1003 may also be referred to as an auxiliary storage device. The above-mentioned recording medium may be, for example, a database, a server, or other appropriate medium including at least one of memory 1002 and storage 1003.

[0161] The communication device 1004 is hardware (transmission / reception device) for communicating between computers via at least one of a wired network and a wireless network, and is also called, for example, a network device, a network controller, a network card, or a communication module.

[0162] The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. to realize, for example, at least one of Frequency Division Duplex (FDD) and Time Division Duplex (TDD).

[0163] The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that receives input from the outside. The output device 1006 is an output device (for example, a display, a speaker, an LED lamp, etc.) that outputs to the outside. The input device 1005 and the output device 1006 may be integrated into one device (for example, a touch panel).

[0164] Furthermore, each device such as the processor 1001 and the memory 1002 is connected to a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using different buses between each device.

[0165] 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 realized by the hardware. For example, the processor 1001 may be implemented using at least one of these pieces of hardware.

[0166] Furthermore, the notification of information is not limited to the aspects / embodiments described in the present disclosure, and may be performed using other methods. For example, the notification of information may be performed by physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI)), higher layer signaling (e.g., RRC signaling, Medium Access Control (MAC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB))), other signals, or a combination thereof. Furthermore, the RRC signaling may be referred to as an RRC message, and may be, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, or the like.

[0167] Each aspect / embodiment described in the present disclosure may be implemented in accordance with Long Term Evolution (LTE), LTE-Advanced (LTE-A), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5G, and other standards. th The present invention may be applied to at least one of a system using a next generation mobile communication system (5G), Future Radio Access (FRA), New Radio (NR), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), or other suitable system, and a next generation system enhanced based on these. Furthermore, the present invention may be applied to a combination of multiple systems (e.g., a combination of at least one of LTE and LTE-A with 5G).

[0168] The order of the procedures, sequences, flowcharts, etc. of each aspect / embodiment described in this disclosure may be changed unless it is consistent. For example, the methods described in this disclosure present elements of various steps using an example order, and are not limited to the particular order presented.

[0169] In the present disclosure, a specific operation described as being performed by a base station may also be performed by its upper node in some cases. In a network consisting of one or more network nodes having a base station, it is clear that various operations performed for communication with a terminal may be performed by at least one of the base station and another network node other than the base station (for example, an MME or an S-GW, etc., but are not limited to these). Although the above example illustrates a case where there is one other network node other than the base station, a combination of multiple other network nodes (for example, an MME and an S-GW) may also be used.

[0170] Information, signals (information, etc.) may be output from a higher layer (or a lower layer) to a lower layer (or a higher layer), or may be input / output via multiple network nodes.

[0171] The input and output information may be stored in a specific location (for example, memory) or may be managed using a management table. The input and output information may be overwritten, updated, or added to. The output information may be deleted. The input information may be sent to another device.

[0172] The determination may be made based on a value represented by one bit (0 or 1), a Boolean value (true or false), or a numerical comparison (e.g., comparison with a predetermined value).

[0173] Each aspect / embodiment described in this disclosure may be used alone, in combination, or switched depending on the implementation. Furthermore, notification of predetermined information (e.g., notification that "X is true") is not limited to being done explicitly, but may be done implicitly (e.g., by not notifying the predetermined information).

[0174] Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

[0175] Software, instructions, information, etc. may also be transmitted or received over a transmission medium. For example, if software is transmitted from a website, server, or other remote source using wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), and / or wireless technologies (such as infrared, microwave), then these wired and / or wireless technologies are included within the definition of transmission media.

[0176] The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0177] Note that terms explained in this disclosure and terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, at least one of a channel and a symbol may be a signal (signaling). Furthermore, a signal may be a message. Furthermore, a component carrier (CC) may be called a carrier frequency, a cell, a frequency carrier, etc.

[0178] As used in this disclosure, the terms "system" and "network" are used interchangeably.

[0179] Furthermore, the information, parameters, etc. described in the present disclosure may be expressed using absolute values, relative values ​​from a predetermined value, or other corresponding information. For example, a radio resource may be indicated by an index.

[0180] The names used for the above-described parameters are not intended to be limiting in any way. Furthermore, the mathematical expressions using these parameters may differ from those explicitly disclosed in this disclosure. The various channels (e.g., PUCCH, PDCCH, etc.) and information elements may be identified by any suitable names, and therefore the various names assigned to these various channels and information elements are not intended to be limiting in any way.

[0181] In this disclosure, terms such as "base station (BS)," "radio base station," "fixed station," "NodeB," "eNodeB (eNB)," "gNodeB (gNB)," "access point," "transmission point," "reception point," "transmission / reception point," "cell," "sector," "cell group," "carrier," and "component carrier" may be used interchangeably. Base stations may also be referred to by terms such as macrocell, small cell, femtocell, and picocell.

[0182] A base station can accommodate one or more (e.g., three) 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 be provided with communication services by a base station subsystem (e.g., a small indoor base station (Remote Radio Head: RRH)).

[0183] The terms "cell" or "sector" refer to part or all of the coverage area of ​​a base station and / or base station subsystem that provides communication services within that coverage area.

[0184] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," etc. may be used interchangeably.

[0185] A mobile station may also be referred to by those skilled in the art as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable terminology.

[0186] At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a communication device, etc. At least one of the base station and the mobile station may be a device mounted on a mobile object, or the mobile object itself. The mobile object may be a vehicle (e.g., a car, an airplane, etc.), an unmanned mobile object (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). At least one of the base station and the mobile station may also include devices that do 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.

[0187] Furthermore, a base station in the present disclosure may be read as a mobile station (user terminal, the same applies hereinafter). For example, the aspects / embodiments of the present disclosure may be applied to a configuration in which communication between a base station and a mobile station is replaced with communication between multiple mobile stations (which may be called, for example, Device-to-Device (D2D) or Vehicle-to-Everything (V2X)). In this case, the mobile station may be configured to have the functions of a base station. Furthermore, terms such as "uplink" and "downlink" may be read as terms corresponding to communication between terminals (for example, "side"). For example, terms such as uplink channel and downlink channel may be read as side channel.

[0188] Similarly, a mobile station in the present disclosure may be interpreted as a base station, in which case the base station may have the functions of a mobile station.

[0189] A radio frame may be made up of one or more frames in the time domain, each of which may be called a subframe. A subframe may further be composed of one or more slots in the time domain, and may have a fixed time length (e.g., 1 ms) that is independent of numerology.

[0190] Numerology may be a communication parameter applied to at least one of transmission and reception of a signal or channel, such as subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame structure, specific filtering operations performed by a transceiver in the frequency domain, and specific windowing operations performed by a transceiver in the time domain.

[0191] A slot may consist of one or more symbols in the time domain (such as an Orthogonal Frequency Division Multiplexing (OFDM) symbol, a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol, etc.) A slot may be a numerology-based time unit.

[0192] A slot may include multiple minislots. Each minislot may consist of one or more symbols in the time domain. A minislot may also be called a subslot. A minislot may consist of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a minislot may be called PDSCH (or PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a minislot may be called PDSCH (or PUSCH) mapping type B.

[0193] The radio frame, subframe, slot, minislot, and symbol all represent time units for transmitting signals, and may be referred to by other names corresponding to the radio frame, subframe, slot, minislot, and symbol.

[0194] For example, one subframe may be called a transmission time interval (TTI), multiple consecutive subframes may be called a TTI, or one slot or one minislot may be called a TTI. That is, at least one of the subframe and the TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (e.g., 1-13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, minislot, etc., instead of a subframe.

[0195] Here, TTI refers to, for example, the smallest time unit for scheduling in wireless communication. For example, in an LTE system, a base station performs scheduling to allocate radio resources (such as frequency bandwidth and transmission power that can be used by each user terminal) to each user terminal in TTI units. However, the definition of TTI is not limited to this.

[0196] The TTI may be a transmission time unit for a channel-encoded data packet (transport block), a code block, a code word, etc., or may be a processing unit for scheduling, link adaptation, etc. When a TTI is given, the time interval (e.g., the number of symbols) to which a transport block, a code block, a code word, etc. is actually mapped may be shorter than the TTI.

[0197] When one slot or one minislot is called a TTI, one or more TTIs (i.e., one or more slots or one or more minislots) may be the minimum time unit for scheduling. Also, the number of slots (minislots) constituting the minimum time unit for scheduling may be controlled.

[0198] A TTI having a time length of 1 ms may be called a regular TTI (TTI in LTE Rel. 8-12), normal TTI, long TTI, regular subframe, normal subframe, long subframe, slot, etc. A TTI shorter than a regular TTI may be called a shortened TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, minislot, subslot, slot, etc.

[0199] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length of more than 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be interpreted as a TTI having a TTI length shorter than the TTI length of a long TTI and equal to or greater than 1 ms.

[0200] A resource block (RB) is a resource allocation unit in the time domain and frequency domain, and may include one or more consecutive subcarriers in the frequency domain. The number of subcarriers included in an RB may be the same regardless of numerology, for example, 12. The number of subcarriers included in an RB may also be determined based on numerology.

[0201] The time domain of an RB may include one or more symbols and may be one slot, one minislot, one subframe, or one TTI in length. Each TTI, subframe, etc. may be composed of one or more resource blocks.

[0202] Note that one or more RBs may also be called a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, or the like.

[0203] 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.

[0204] A Bandwidth Part (BWP) (which may also be referred to as a fractional bandwidth) may represent a subset of contiguous common resource blocks (RBs) for a given numerology on a given carrier, where the common RBs may be identified by their index relative to a common reference point of the carrier. PRBs may be defined in a given BWP and numbered within that BWP.

[0205] 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.

[0206] At least one of the configured BWPs may be active, and the UE may not expect to transmit or receive a given signal / channel outside the active BWP. Note that the terms "cell," "carrier," etc. in this disclosure may be read as "BWP."

[0207] The above-described structures of the radio frame, subframe, slot, minislot, and symbol are merely examples. For example, the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the cyclic prefix (CP) length, and other configurations can be changed in various ways.

[0208] The terms "connected," "coupled," or any variation thereof, refer to any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, "connected" may be read as "access." As used in this disclosure, two elements may be considered to be "connected" or "coupled" to each other using one or more wires, cables, and / or printed electrical connections, as well as electromagnetic energy having wavelengths in the radio frequency range, microwave range, and optical (both visible and invisible) range, as some non-limiting and non-exhaustive examples.

[0209] The reference signal may also be abbreviated as Reference Signal (RS), and may also be called a pilot depending on the applicable standard.

[0210] As used in this disclosure, the phrase "based on" does not mean "based only on," unless expressly stated otherwise. In other words, the phrase "based on" means both "based only on" and "based at least on."

[0211] The "means" in the configuration of each of the above devices may be replaced with "part," "circuit," "device," etc.

[0212] As used in this disclosure, any reference to an element using a designation such as "first," "second," etc. does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, a reference to a first and a second element does not imply that only two elements may be employed therein or that the first element must precede the second element in some way.

[0213] When used in this disclosure, the terms "include," "including," and variations thereof are intended to be inclusive, similar to the term "comprising." Furthermore, when used in this disclosure, the term "or" is not intended to be an exclusive or.

[0214] In this disclosure, where articles are added by translation, such as a, an, and the in English, the disclosure may include that the nouns following these articles are in the plural form.

[0215] As used in this disclosure, the terms "determining" and "determining" may encompass a wide variety of actions. "Determining" and "determining" may include, for example, judging, calculating, computing, processing, deriving, investigating, looking up, searching, inquiring (e.g., searching in a table, database, or other data structure), ascertaining, and the like. "Determining" and "determining" may also include receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in memory), and the like. Furthermore, "judgment" and "decision" can include regarding resolving, selecting, choosing, establishing, comparing, etc. as having been "judged" or "decided." In other words, "judgment" and "decision" can include regarding some action as having been "judged" or "decided." Furthermore, "judgment (decision)" can be interpreted as "assuming," "expecting," "considering," etc.

[0216] In the present disclosure, the term "A and B are different" may mean "A and B are different from each other." The term may also mean "A and B are each different from C." Terms such as "separate" and "coupled" may also be interpreted in the same way as "different."

[0217] Although the present disclosure has been described in detail above, it is clear to those skilled in the art that the present disclosure is not limited to the embodiments described herein. The present disclosure can be implemented in modified and altered forms without departing from the spirit and scope of the present disclosure as defined by the claims. Therefore, the description of the present disclosure is intended to be illustrative and does not have any limiting meaning on the present disclosure. [Explanation of symbols]

[0218] 10. Wireless communication systems 50 CU 100A, 100B, 100C wireless communication nodes 161 Radio transmitter 162 Radio receiving unit 165 Cell information acquisition unit 170 Control Unit UE 200 1001 processor 1002 memory 1003 Storage 1004 Communication equipment 1005 Input Device 1006 Output Device 1007 Bus

Claims

1. A wireless communication node, The additional time T included in the time difference between transmission at the serving cell and reception at the wireless communication node delta a receiver for receiving a control element including an index of The additional time T provided by the control element delta and the additional time T delta The granularity and the addition time T delta a control unit that determines a calculation formula for calculating the time difference using the initial value of Equipped with the control unit sets a fixed value to the initial value regardless of the subcarrier spacing. Wireless communication node.

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

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

4. A wireless communication system including a first wireless communication node and a second wireless communication node, The first wireless communication node calculates an additional time T included in the time difference between transmission in a serving cell and reception in the second wireless communication node. delta a transmitter for transmitting a control element including The second wireless communication node a receiving unit for receiving the control element; The additional time T provided by the control element delta and the additional time T delta The granularity and the addition time T delta a control unit that determines a calculation formula for calculating the time difference using the initial value of Equipped with the control unit sets a fixed value to the initial value regardless of the subcarrier spacing. Wireless communication system.

Images