Wireless node and wireless communication method

Abstract

To appropriately adjust transmission timing between radio nodes.SOLUTION: A radio node according to one aspect of the present disclosure includes a receiving unit that receives information about an offset that may remain in transmission timing adjustment to a first downlink radio link at an upstream node from the first downlink radio link, and a control unit that controls transmission timing to a second downlink radio link toward a downstream node based on the information about the offset.SELECTED DRAWING: Figure 3

Description

[Technical field]

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

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

[0003] Regarding future wireless communication systems (e.g., 5G), a technology called Integrated Access and Backhaul (IAB) that integrates an access link and a backhaul (BH) link is being considered (Non-Patent Document 1). An IAB node, which is an example of a wireless node, forms a wireless access link with a user terminal (User Equipment (UE)) and also forms a wireless BH link with other IAB nodes and / or wireless base stations. [Prior art documents] [Non-patent literature]

[0004] [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)”,December 2018 Summary of the Invention [Problem to be solved by the invention]

[0005] However, there has been insufficient consideration of the coordination of transmission timing between wireless nodes.

[0006] An object of one embodiment of the present disclosure is to appropriately adjust transmission timing between wireless nodes. [Means for solving the problem]

[0007] A wireless node according to one embodiment of the present disclosure includes a receiving unit that receives information regarding an offset that may remain in a transmission timing adjustment to a first downlink wireless link at an upstream node from the first downlink wireless link, and a control unit that controls a transmission timing to a second downlink wireless link toward a downstream node based on the information regarding the offset. Effect of the Invention

[0008] According to the present disclosure, data transmission timing between wireless nodes can be appropriately adjusted. [Brief description of the drawings]

[0009] [Figure 1] 1 is a diagram illustrating an example of a configuration of a wireless communication system according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a diagram illustrating a configuration example of an IAB node according to the present embodiment. [Diagram 3]FIG. 1 is a diagram for explaining timing alignment in a wireless section according to the present embodiment. [Figure 4] 1 is a diagram for explaining a multi-hop topology and a residual error according to an embodiment of the present invention; [Diagram 5] 1 is a diagram showing an example in which a child IAB node in this embodiment has multiple parent IAB nodes; [Figure 6] 10 is a diagram for explaining a residual error code according to the present embodiment; FIG. [Figure 7] A diagram showing an example of the hardware configuration of an IAB node and a user terminal according to the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings.

[0011] (Present embodiment) <System configuration> FIG. 1 shows an example of the configuration of a wireless communication system.

[0012] The wireless communication system 1 includes a plurality of IAB nodes 10A-10C, which are an example of wireless nodes, and a UE 20, which is an example of a user terminal. Hereinafter, when the IAB nodes 10A-10C are described without being differentiated from one another, only common reference numbers may be used, such as "IAB node 10."

[0013] The IAB nodes 10A to 10C are each connected to other IAB nodes 10 by wireless communication. As shown in FIG. 1, the IAB node 10B is connected to the IAB node 10A and the IAB node 10C. Focusing on the relationship between the IAB node 10A and the IAB node 10B, the IAB node 10A is located one node upstream of the IAB node 10B. In other words, the IAB node 10B is located one node downstream of the IAB node 10A. Therefore, the IAB node 10A may be called a parent IAB node for the IAB node 10B, and the IAB node 10B may be called a child IAB node for the IAB node 10A. Here, "downstream" refers to a direction away from the IAB donor, and "upstream" refers to a direction toward the IAB donor.

[0014] Each of the IAB nodes 10A to 10C forms a cell, which is an area where wireless communication is possible. That is, the IAB node 10 functions as a base station. The UE 20 in a cell can be wirelessly connected to the IAB node 10 that forms the cell.

[0015] When the IAB node 10A is an IAB donor, the IAB node 10A connects to a communication system such as a core network (Core Network (CN)) through a transmission / reception means such as a fiber BH. The fiber BH is not limited to optical fiber, and may be any means capable of transmitting and receiving data. The transmission / reception means between the IAB node 10A and the core network may be a high-capacity wireless transmission means. The number of IAB nodes 10 and the number of UEs 20 included in the wireless communication system 1 are not limited to the example of FIG. 1. For example, the parent IAB node 10A connected to the IAB node 10B may be two or more. The child IAB node 10C connected to the IAB node 10B may be two or more. The number of UEs 20 connected to the IAB node 10B may be two or more.

[0016] L and its subscripts in Figure 1 indicate the following: L P,DL indicates a Downlink (DL) from the parent IAB node 10A to the IAB node 10B. LP,UL indicates an Uplink (UL) from the IAB node 10B to the parent IAB node 10A. L C,DL indicates a DL from the IAB node 10B to the child IAB node 10C. L C,UL indicates a UL from child IAB node 10C to IAB node 10B. L A,DL indicates DL from the IAB node 10B to the UE 20. L A,UL indicates the UL from the UE 20 to the IAB node 10B.

[0017] L A,DL and / or L A,UL is called the access link. P,DL , L P,UL , L C,DL and / or L C,UL is called the BH link.

[0018] <IABノード> FIG. 2 shows an example of the configuration of the IAB node 10.

[0019] As shown in FIG. 2, the IAB node 10 has a control unit 100, a Mobile Termination (MT) 102, and a Distributed Unit (DU) 103. The MT 102 and the DU 103 may be functional blocks. Hereinafter, when expressing the function of the MT 102, it may be expressed without a reference symbol, such as MT, and when expressing the function of the DU 103, it may be expressed without a reference symbol, such as DU. The DU 103 may have a function equivalent to a base station. The DU 103 may have a function equivalent to a base station in a base station that includes a base station that processes the wireless part and an aggregate station that processes other than the wireless part. An example of the MT 102 may have a function equivalent to a terminal.

[0020] The MT 102 of the IAB node 10B controls a BH link with the parent IAB node 10A (hereinafter referred to as a "parent link"). The DU 103 of the IAB node 10B controls a BH link with the child IAB node 10C and / or an access link with the UE 20. Hereinafter, the BH link with the child IAB node 10C and / or the access link with the UE 20 are referred to as a "child link".

[0021] The control unit 100 controls the MT 102 and the DU 103. The operation of the IAB node 10, which will be described later, may be realized by the control unit 100 controlling the MT 102 and the DU 103. The control unit 100 may also include a storage unit for storing various information.

[0022] A half-duplex constraint may be applied between the parent link and the child link. To realize the half-duplex constraint, Time Division Multiplexing (TDM) may be applied to the parent link and the child link. In this case, the time resource may be available to either the parent link or the child link. Note that the application of TDM is an example, and for example, Frequency Division Multiplexing (FDM) or Space Division Multiplexing (SDM) may be applied.

[0023] The time resource in the parent link (hereinafter referred to as "MT resource") is set to one of the following types. MT resources with DL type (hereinafter referred to as "MT-D") are P,DL It is used as. MT resources with UL type (hereinafter referred to as "MT-U") are P,UL It is used as. MT resources with the Flexible (FL) type (hereinafter referred to as "MT-F") are P,DL Or L P,UL It is used as.

[0024] The MT resource may be interpreted as a resource used for communication with the parent IAB node 10A, a resource used for communication of a backhaul link with the parent IAB node 10A, or a resource used for communication with a serving cell, etc. Also, the MT resource may be an example of a resource of the first radio section.

[0025] The time resource in the child link (hereinafter referred to as the "DU resource") is set to one of the following types. DU resources with DL type set (hereinafter referred to as "DU-D") are C,DL Or L A,DL It may be used as. DU resources with UL type (hereinafter referred to as "DU-U") C,UL Or L A,UL It may be used as. DU resources with FL type (hereinafter referred to as "DU-F") C,DL , L C,UL , L A,DL Or L A,UL It may be used as. ·DU resources with the Not-Available (NA) type set (hereinafter referred to as "DU-NA") are not used for child links.

[0026] The DU resource may be interpreted as another expression such as a resource used for communication with the child IAB node 10C and / or the UE 20, or a resource used for communication with a backhaul link with the child IAB node 10C and / or an access link with the UE 20. The DU resource may be an example of a resource of the second wireless section.

[0027] Furthermore, one of the following types is set for the DU-D, DU-U, and DU-F. DU resources with the Hard type set are used for child links and not for parent links. Hereinafter, DU resources with the Hard type set may be expressed as "DU(H)". Whether a DU resource with the Soft type can be used for a child link (hereinafter referred to as "Availability") is determined by an explicit and / or implicit instruction from the parent IAB node 10A. Hereinafter, a DU resource with the Soft type may be referred to as "DU(S)".

[0028] In addition, the DL, FL, FL, and NA settings, and the Soft and Hard settings in the DU resource may be set semi-statically. For example, these settings for the DU may be set by RRC parameters. RRC is an abbreviation for Radio Resource Control. In addition, the RRC parameters may be replaced with other terms such as RRC signaling, RRC message, or RRC setting. In addition, these settings for the DU may be set by F1-AP parameters. In addition, the F1-AP parameters may be replaced with other terms such as F1-AP signaling or F1-AP message.

[0029] <Consideration> The following describes the alignment of transmission timing over-the-air (OTA) between the IAB nodes 10. Note that the word "alignment" may be replaced with other terms such as "alignment," "registration," "alignment," or "synchronization."

[0030] For transmit timing alignment, the IAB node 10 adjusts the DL transmit timing to be TA / 2+T earlier than the DL receive timing. delta You can set the time ahead by a certain amount of time. TA is an abbreviation for Timing Advance.

[0031] T delta is a value that takes into account factors such as the offset between DL transmission timing and UL reception timing at the parent IAB node 10A, such as switching time from transmission to reception and / or hardware impairments. deltamay be signaled from the parent IAB node 10A to the child IAB node 10B.

[0032] TA is a value indicating the timing gap between the UL transmission timing and the DL reception timing, and may be derived based on an existing mechanism.

[0033] T used in the wireless section between IAB nodes 10 delta For example, the following considerations are insufficient: T delta Value range and granularity T delta Aperiodic or periodic updates of T delta Other timing degradation factors to adjust the timing of IAB nodes included in Timing alignment when an IAB node 10B has multiple parent IAB nodes 10A

[0034] Next, an example of timing alignment will be described with reference to FIG.

[0035] For example, as shown in FIG. 3, the difference between the DL transmission timing and the UL reception timing in the parent IAB node 10A is set to 2T. delta The propagation delay time from the parent IAB node 10A to the child IAB node 10B is T prop In this case, the parent IAB node 10A sets the TA to be applied to the UL transmission timing of the MT of the child IAB node 10B as 2T. prop +2T delta Then, the child IAB node 10B may instruct the DL transmission timing of the DU to be TA / 2-T delta The timing may be set forward by 10 hours. This aligns the DL transmission timing of the parent IAB node 10A with the DL transmission timing of the DU of the child IAB node 10B. Note that "calculation" may be replaced with other terms such as "decision" or "determination."

[0036] T delta Due to the granularity limitations, in a multi-hop topology such as that shown in FIG. 4, residual error may accumulate in DL transmission timing as the number of hops increases.

[0037] For example, as shown in FIG. 4, a multi-hop topology is assumed in which IAB nodes #1 to #4 are connected in series to an IAB donor. delta1 may contain a residual error ε1. Similarly, T delta2 ~T delta4 may contain residual errors ε2 to ε4. Therefore, IAB node #4 uses TA4 and T delta4 If the DL transmission timing of the DU is aligned using delta4 Due to the residual errors ε1 to ε4 accumulated in the DU, the DL transmission timing of the DU and the DL transmission timing of the upstream IAB node 10 may not be aligned.

[0038] Furthermore, as shown in FIG. 5, when the child IAB node 10B has a plurality of parent IAB nodes 10A#1 and #2, there has been insufficient consideration as to how the child IAB node 10B determines the DL transmission timing.

[0039] That is, T at the parent IAB node 10A delta A method of generating T and T instructed by the parent IAB node 10A delta The method of using the IAB in the child IAB node 10B has not been sufficiently considered. A new proposal to address this insufficient consideration will be described below.

[0040] <Proposal> T delta Generation of and instructed T delta The determination of the DL transmission timing based on may be specified so that multiple IAB nodes 10 can appropriately determine the DL transmission timing for timing alignment.

[0041] Next, T at parent IAB node 10A delta A method for generating the DL transmission timing and a method for determining the DL transmission timing in the child IAB node 10B will be described.

[0042] <T at parent IAB node 10A delta How to generate > Then, T at parent IAB node 10A delta As an example of a method for generating the image, (A1) and (A2) will be described. Note that both (A1) and (A2) may be applied, or either one of them may be applied.

[0043] (A1) T delta TA / 2-T delta may be generated based on the DL transmission timing of the child IAB node 10B to be aligned with the DL transmission timing of the parent IAB node 10A.

[0044] In this case, T delta Since the granularity of is limited, residual error may exist. Note that the residual error may be interpreted as another term such as a residual offset.

[0045] The information indicating the positive or negative expected residual error (hereinafter referred to as the "residual error sign") is delta In this case, the child IAB node 10B may round the residual error in the opposite sign direction to the instructed residual error sign to obtain T delta may be generated.

[0046] An example will be described with reference to Fig. 6. As shown in Fig. 6, a parent IAB node 10A can instruct a child IAB node 10B to delta Since the grain size of is limited, the calculated grain size of T delta The value of T deltaThat is, the parent IAB node 10A may round the calculated granularity to T delta Here, the parent IAB node 10A may round the value of T delta The parent IAB node 10A may round the calculated granularity T delta may generate a negative residual error sign when rounded towards the negative side, and may generate a positive residual error sign when rounded towards the positive side.

[0047] Child IAB node 10B also has T delta Calculate the T of this calculated particle size delta to the downstream IAB node 10C. delta At this time, the child IAB node 10B rounds the calculated granularity to T delta The child IAB node 10B may round the value of T delta For example, when a negative residual error code is instructed from the parent IAB node 10A, the child IAB node 10B may round the calculated granularity T delta The value of may be rounded upwards.

[0048] The residual error code may be treated, for example, as in (B1) and / or (B2) below.

[0049] (B1) If the absolute value of the expected residual error is very small (e.g., less than a first threshold), the residual error code may be ignored. For example, the child IAB node 10B may ignore the calculated granularity T delta If the absolute value of the expected residual error in is less than the first threshold, the indicated residual error sign is ignored and the calculated granularity T delta For example, the parent IAB node 10A may round the calculated granularity T deltais less than the first threshold, the residual error code may not be instructed to the child IAB node 10B.

[0050] (B2) If the absolute value of the expected residual error is slightly larger (e.g., equal to or greater than a second threshold), a sign opposite to the residual error sign indicated by the parent IAB node 10A may be selected. For example, the child IAB node 10B may select the T delta If the absolute value of the expected residual error in is equal to or greater than the second threshold, delta may be rounded in the direction opposite to the indicated residual error sign. This (B2) may be applied when the absolute value of the positive residual error and the absolute value of the negative residual error are of equal magnitude (for example, the difference between the absolute values ​​of the two residual errors is less than a third threshold). delta may be rounded to the sign direction of the smaller absolute value of the residual error when the difference between the absolute value of the residual error in the positive direction and the absolute value of the residual error in the negative direction is equal to or greater than a third threshold.

[0051] T in (A1) above delta According to the method of generating the IAB node 10, delta Since the residual errors are rounded off in a direction that cancels out each other, the accumulation of residual errors that occurs with an increase in the number of hops can be suppressed. Therefore, the DL transmission timing of each IAB node 10 is aligned.

[0052] (A2) If the IAB node 10 has an accurate time synchronization source (e.g., Global Navigation Satellite System (GNSS)), the T delta may be adjusted using the time synchronization source.

[0053] That is, when the IAB node 10B has a time synchronization source, the DL transmission timing is determined by the DL reception timing from the parent IAB node 10A, TA and T delta On the other hand, the IAB node 10B may determine the Tdelta may be adjusted using the time synchronization source.

[0054] In this case, T delta TA / 2-T delta may be generated to align the DL transmission timing of the child IAB node 10B based on the time synchronization source with the ideal DL transmission timing derived by the time synchronization source.

[0055] Furthermore, the parent IAB node 10A may instruct the child IAB node 10B on information regarding the absolute time of the DL transmission timing intended by the network of the wireless communication system 1 (that is, the ideal DL transmission timing).

[0056] In addition, the hop order from the IAB node 10 having the time synchronization source is T delta Along with this, it may be instructed to the child IAB node 10B.

[0057] T in (A2) above delta According to the method of generating T, the T calculated in the IAB node 10 having the time synchronization source delta Since the accumulation of residual errors is reset in the IAB node 10, the accumulation of residual errors caused by an increase in the number of hops can be suppressed. Therefore, the DL transmission timing of each IAB node 10 is aligned.

[0058] <Method of Determining DL Transmission Timing in Child IAB Node 10B> Next, T instructed by the parent IAB node 10A delta As an example of a method for determining the DL transmission timing in the child IAB node 10B based on (Alt. C1) and (Alt. C2), (Alt. C1) and (Alt. C2) will be described. Note that either (Alt. C1) or (Alt. C2) may be applied.

[0059] (Alt.C1) As illustrated in FIG. 5, when the child IAB node 10B has multiple parent IAB nodes 10A#1, #2, the child IAB node 10B may perform the following operation for the purpose of timing alignment. That is, the child IAB node 10B may select one parent IAB node 10A with a smaller hop order from among the multiple parent IAB nodes 10A#1, #2. The purpose of timing alignment may be, for example, the purpose of determining DL transmission timing and / or the purpose of T delta This may be for the purpose of generating

[0060] The hop order may be indicated from the parent IAB node 10A. The indicated hop order may be from an IAB donor. Alternatively, the indicated hop order may be from an IAB node 10 having a time synchronization source as described above.

[0061] The value derived by the parent IAB node 10A of the smaller hop order (e.g., T delta ) and a value derived by a parent IAB node 10A of a larger hop order (e.g., T delta ) may be reported to a parent IAB node 10A having a larger hop order. That is, the DL transmission timing may be determined based on an instruction from one parent IAB node 10A. On the other hand, T delta The instruction of T may be adjusted using the report from the child IAB node 10B. Thus, the parent IAB node 10A having a larger hop order may use the difference reported by the child IAB node 10B to adjust T delta The accuracy of the above can be improved.

[0062] (Alt.C2) The DL transmission timing is determined by a value derived by each of the parent IAB nodes 10A (for example, T delta In this case, any one of the following (Alt. C2-1), (Alt. C2-2), and (Alt. C2-3) may be applied.

[0063] (Alt.2-1) Averaging may be permitted when multiple parent IAB nodes 10A have a common hop order. Alternatively, averaging may be permitted when the hop orders of multiple parent IAB nodes 10A are within a predetermined range. Alternatively, averaging may be permitted when the difference between the hop orders of multiple parent IAB nodes 10A is within a predetermined range.

[0064] (Alt.2-2) Averaging may be permitted regardless of the hop order of the parent IAB node 10A.

[0065] (Alt. 2-3) Averaging with weighting based on hop order may be allowed. For example, IAB nodes 10 with smaller hop orders may be applied with a larger weighting in the averaging.

[0066] The above indicated T delta According to the method for determining the DL transmission timing based on the above, even if the child IAB node 10B has multiple parent IAB nodes 10A, the child IAB node 10B can determine the DL transmission timing based on the above. delta Based on this, the DL transmission timing can be determined.

[0067] <Summary of this embodiment> In this embodiment, the IAB node 10B includes a receiving unit that receives information about an offset that may remain after the transmission timing adjustment for the first downlink radio link at the upstream node from the first radio link, and a control unit that controls the transmission timing for the second downlink radio link toward the downstream node based on the information about the offset. Here, the information about the offset may include the above-mentioned residual error code. In addition, since the information about the offset may change depending on the hop order, the information about the offset may include information indicating the above-mentioned hop order.

[0068] According to the above configuration, accumulation of residual errors caused by an increase in the number of hops can be suppressed, so that the DL transmission timing of each IAB node 10 is aligned.

[0069] <Hardware configuration, etc.> The block diagrams used to explain the above embodiments show functional blocks. These functional blocks (components) are realized by any combination of at least one of hardware and software. The method of realizing each functional block is not particularly limited. That is, each functional block may be realized by using one device that is physically or logically combined, or may be realized by using two or more devices that are physically or logically separated and directly or indirectly connected (for example, by wire, wirelessly, etc.). The functional blocks may be realized by combining the one device or the multiple devices with software.

[0070] Functions include, but are not limited to, judgment, determination, judgment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, consideration, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocation, mapping, assignment, etc. For example, a functional block (component) that performs the function of transmission is called a transmitting unit or a transmitter. In either case, as described above, there is no particular limitation on the method of realization.

[0071] For example, a base station, a user terminal, or the like in an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 7 is a diagram showing an example of a hardware configuration of an IAB node and a UE according to an embodiment of the present disclosure. The above-mentioned IAB node 10 and UE 20 may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like.

[0072] In the following description, the term "apparatus" may be replaced with a circuit, a device, a unit, etc. The hardware configuration of the IAB node 10 and the UE 20 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.

[0073] Each function in the IAB node 10 and UE 20 is realized by loading a specific software (program) onto hardware such as a processor 1001 and a memory 1002, causing the processor 1001 to perform calculations, control communications by the communication device 1004, and control at least one of reading and writing of data in the memory 1002 and the storage 1003.

[0074] The processor 1001, for example, operates an operating system to control the entire computer. The processor 1001 may be configured with a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, a register, etc. For example, the above-mentioned control unit 100, MT 102, DU 103, etc. may be realized by the processor 1001.

[0075] Moreover, the processor 1001 reads out a program (program code), a software module, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and executes various processes according to the read out programs. As the program, a program that causes a computer to execute at least a part of the operations described in the above-mentioned embodiment is used. For example, the control unit of the UE 20 may be realized by a control program stored in the memory 1002 and running on the processor 1001, and other functional blocks may be similarly realized. Although the above-mentioned various processes have been described as being executed by one processor 1001, they may be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 may be implemented by one or more chips. The program may be transmitted from a network via a telecommunication line.

[0076] The memory 1002 is a computer-readable recording medium, and may be configured by at least one of, for example, 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 be called a register, a cache, a main memory (primary storage device), etc. The memory 1002 can store a program (program code), software modules, etc. that are executable to implement a wireless communication method according to an embodiment of the present disclosure.

[0077] Storage 1003 is a computer-readable recording medium, and may be composed of at least one of, for example, an optical disk such as a CD-ROM (Compact Disc ROM), a hard disk drive, a flexible disk, a magneto-optical disk (e.g., a compact disk, a digital versatile disk, a Blu-ray (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, and the like. Storage 1003 may be referred to as an auxiliary storage device. The above-mentioned storage medium may be, for example, a database, a server, or other suitable medium including at least one of memory 1002 and storage 1003.

[0078] The communication device 1004 is hardware (transmission / reception device) for performing communication 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, a communication module, etc. The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc., in order to realize at least one of Frequency Division Duplex (FDD) and Time Division Duplex (TDD). For example, the antennas provided in the IAB node 10 and the UE 20 may be realized by the communication device 1004. The transmission / reception unit may be implemented as a transmission unit and a reception unit that are physically or logically separated.

[0079] The input device 1005 is an input device (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that accepts input from the outside. The output device 1006 is an output device (e.g., a display, a speaker, an LED lamp, etc.) that performs output to the outside. The input device 1005 and the output device 1006 may be integrated into one device (e.g., a touch panel).

[0080] In addition, each device such as the processor 1001 and the memory 1002 is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using different buses between each device.

[0081] In addition, the IAB node 10 and the UE 20 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), and 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.

[0082] <Information notification, signaling> The notification of information is not limited to the aspects / embodiments described in the present disclosure, and may be performed using other methods. For example, the notification of information may be performed by physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB))), other signals, or a combination thereof. In addition, the RRC signaling may be called an RRC message, and may be, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, or the like.

[0083] <Applicable systems> Each aspect / embodiment described in the present disclosure may be applied to at least one of systems using LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system), FRA (Future Radio Access), NR (new Radio), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, UWB (Ultra-WideBand), Bluetooth (registered trademark), and other suitable systems, and next-generation systems extended based on these. In addition, a combination of multiple systems (e.g., a combination of at least one of LTE and LTE-A and 5G, etc.) may be applied.

[0084] <Processing procedures, etc.> The order of the steps, sequences, flow charts, etc. of each aspect / embodiment described in this disclosure may be changed unless inconsistent. 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.

[0085] <Base station operation> In the present disclosure, a specific operation performed by a base station may 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 other network nodes other than the base station (e.g., MME or S-GW, etc., but are not limited to these). Although the above example illustrates a case in which there is one other network node other than the base station, it may also be a combination of multiple other network nodes (e.g., MME and S-GW).

[0086] <Input / output direction> Information, etc. (see the "Information, Signals" section) may be output from a higher layer (or a lower layer) to a lower layer (or a higher layer). It may also be input / output via multiple network nodes.

[0087] <Handling of input and output information, etc.> The input and output information may be stored in a specific location (e.g., 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 transmitted to another device.

[0088] <Judgment method> The determination may be based on a value represented by a single bit (0 or 1), a Boolean value (true or false), or a numerical comparison (e.g., comparison with a predetermined value).

[0089] <Variations in form, etc.> Each aspect / embodiment described in this disclosure may be used alone, in combination, or switched according to execution. In addition, notification of predetermined information (e.g., notification that "X is the case") is not limited to being done explicitly, but may be done implicitly (e.g., by not notifying the predetermined information).

[0090] 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 in the present disclosure. 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.

[0091] <Software> Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

[0092] Additionally, software, instructions, information, etc. may be transmitted or received over a transmission medium. For example, if the 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, etc.), then these wired and / or wireless technologies are included within the definition of transmission media.

[0093] <Information, Signals> The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, the 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.

[0094] In addition, the terms described in this disclosure and the 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). Also, a signal may be a message. Also, a component carrier (CC) may be called a carrier frequency, a cell, a frequency carrier, etc.

[0095] <System, Network> As used in this disclosure, the terms "system" and "network" are used interchangeably.

[0096] <Parameter, channel name> In addition, the information, parameters, etc. described in the present disclosure may be represented using absolute values, may be represented using relative values ​​from a predetermined value, or may be represented using other corresponding information. For example, a radio resource may be indicated by an index.

[0097] The names used for the above-mentioned parameters are not limiting in any way. Moreover, the formulas 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 limiting in any way.

[0098] <Base station> 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", "component carrier", etc. may be used interchangeably. A base station may also be referred to by terms such as a macro cell, a small cell, a femto cell, a pico cell, etc.

[0099] A base station can accommodate one or more (e.g., three) cells. When a base station accommodates multiple cells, the entire coverage area of ​​the base station can be partitioned into multiple smaller areas, and each smaller area can also be provided with communication services by a base station subsystem (e.g., a small indoor base station (RRH: Remote Radio Head)). The term "cell" or "sector" refers to a part or the entire coverage area of ​​a base station and / or a base station subsystem that provides communication services in this coverage.

[0100] <Mobile Station> In this disclosure, the terms "Mobile Station (MS)", "user terminal", "User Equipment (UE)", "terminal", etc. may be used interchangeably.

[0101] 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.

[0102] <Base station / mobile station> 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 moving body, the moving body itself, etc. The moving body may be a vehicle (e.g., a car, an airplane, etc.), an unmanned moving body (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 include a device that does not necessarily move during communication operation. For example, at least one of the base station and the mobile station may be an IoT (Internet of Things) device such as a sensor.

[0103] Also, the base station in the present disclosure may be read as a user terminal. For example, the aspects / embodiments of the present disclosure may be applied to a configuration in which communication between a base station and a user terminal is replaced with communication between a plurality of user terminals (which may be called, for example, D2D (Device-to-Device) or V2X (Vehicle-to-Everything)). In this case, the user terminal 20 may be configured to have the functions of the base station 10 described above. Furthermore, terms such as "uplink" and "downlink" may be read as terms corresponding to terminal-to-terminal communication (for example, "side"). For example, the uplink channel, the downlink channel, etc. may be read as a side channel. Similarly, the user terminal in the present disclosure may be read as a base station. In this case, the base station 10 may be configured to have the functions of the user terminal 20 described above.

[0104] <Terminology and interpretation> As used in this disclosure, the terms "determining" and "determining" may encompass a wide variety of actions. "Determining" and "determining" may include, for example, judging, calculating, computing, processing, deriving, investigating, looking up, search, inquiry (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 a memory), and the like. In addition, "judgment" and "decision" can include considering resolving, selecting, choosing, establishing, comparing, etc., to be a "judgment" or "decision." In other words, "judgment" and "decision" can include considering some action to be a "judgment" or "decision." In addition, "judgment" can be interpreted as "assuming," "expecting," "considering," etc.

[0105] 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 at least one of one or more wires, cables, and 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.

[0106] <Reference signal> The reference signal may be abbreviated as RS (Reference Signal) and may be called a pilot depending on the applicable standard.

[0107] <The meaning of "based on"> As used in this disclosure, the phrase "based on" does not mean "based only on," unless expressly stated otherwise. In other words, the phrase "based on" means both "based only on" and "based at least on."

[0108] <"First", "Second"> Any reference to an element using a designation such as "first," "second," etc., used in this disclosure does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, a reference to a first and a second element does not imply that only two elements may be employed or that the first element must precede the second element in some way.

[0109] <“Means”> In the configuration of each of the above devices, the "means" may be replaced with a "section", "circuit", "device", etc.

[0110] <Open format> In the present disclosure, when the terms "include", "including" and their variants are used, these terms are intended to be inclusive, similar to the term "comprising". Further, the term "or" used in the present disclosure is not intended to be an exclusive disjunction.

[0111] <Time units such as TTI, frequency units such as RB, radio frame configuration> A radio frame may be composed of one or more frames in the time domain. Each of the one or more frames in the time domain may be called a subframe.

[0112] A subframe may further be composed of one or more slots in the time domain. The subframe may have a fixed time length (e.g., 1 ms) that does not depend on numerology.

[0113] Numerology may be a communication parameter applied to at least one of transmission and reception of a certain signal or channel. Numerology may indicate, for example, at least one of subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame configuration, specific filtering processing performed by a transceiver in the frequency domain, specific windowing processing performed by a transceiver in the time domain, etc.

[0114] A slot may be composed of one or more symbols (such as an Orthogonal Frequency Division Multiplexing (OFDM) symbol, a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol, etc.) in the time domain. A slot may be a time unit based on numerology.

[0115] A slot may include multiple minislots. Each minislot may be composed of one or multiple symbols in the time domain. A minislot may also be called a subslot. A minislot may be composed 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.

[0116] A radio frame, a subframe, a slot, a minislot, and a symbol each represent a time unit for transmitting a signal. The radio frame, the subframe, the slot, the minislot, and the symbol may each be referred to by a different name.

[0117] 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 the existing LTE, a period shorter than 1 ms (for example, 1-13 symbols), or a period longer than 1 ms. Note that the unit expressing the TTI may be called a slot, a minislot, or the like, instead of a subframe.

[0118] Here, TTI refers to, for example, the minimum 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. Note that the definition of TTI is not limited to this.

[0119] 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) in which a transport block, a code block, a code word, etc. are actually mapped may be shorter than the TTI.

[0120] In addition, when one slot or one minislot is called TTI, one or more TTIs (i.e., one or more slots or one or more minislots) may be the minimum time unit of scheduling. Also, the number of slots (minislots) constituting the minimum time unit of scheduling may be controlled.

[0121] A TTI having a time length of 1 ms may be called a normal TTI (TTI in LTE Rel. 8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, a long subframe, a slot, etc. A TTI shorter than a normal TTI may be called a shortened TTI, a short TTI, a partial or fractional TTI, a shortened subframe, a short subframe, a minislot, a subslot, a slot, etc.

[0122] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length exceeding 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.

[0123] A resource block (RB) is a resource allocation unit in the time domain and the 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 the numerology, for example, 12. The number of subcarriers included in an RB may be determined based on the numerology.

[0124] In addition, the time domain of the RB may include one or more symbols and may be one slot, one minislot, one subframe, or one TTI in length. Each of one TTI, one subframe, etc. may be composed of one or more resource blocks.

[0125] Note that one or more RBs may 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.

[0126] 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.

[0127] 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 numerology on a carrier, where the common RBs may be identified by the index of the RBs relative to a common reference point of the carrier. PRBs may be defined in a BWP and numbered within the BWP. 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.

[0128] 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 replaced with "BWP".

[0129] The above-mentioned structures of radio frames, subframes, slots, minislots, symbols, etc. are merely examples. For example, the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the cyclic prefix (CP) length, etc. may be changed in various ways.

[0130] <Maximum transmission power> The "maximum transmit power" in this disclosure may mean the maximum value of transmit power, may mean the nominal UE maximum transmit power, or may mean the rated UE maximum transmit power.

[0131] <Article> In this disclosure, where articles have been added due to translation, such as, for example, a, an, and the in English, the disclosure may include that the nouns following these articles are in the plural form.

[0132] <"Different"> 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." [Industrial Applicability]

[0133] One aspect of the present disclosure is useful in wireless communication systems. [Explanation of symbols]

[0134] 10, 10A, 10B, 10C IAB nodes 20UE 100 Control section 102 MT 103DU

Claims

1. a receiving unit that receives, from a first downlink radio link, information about an offset, the information including a value of an offset that may remain after a transmission timing adjustment to the first downlink radio link at an upstream node; a control unit that controls a transmission timing for a second downlink toward a downstream node based on information about the offset; Equipped with The offset value is rounded either negatively or positively depending on the expected direction of the residual error. Wireless node.

2. A wireless node receiving information about an offset from a first downlink radio link, the information including a value of an offset that may remain after a transmission timing adjustment to the first downlink radio link at an upstream node; controlling a transmission timing for a second downlink radio link toward a downstream node based on information about the offset; The offset value is rounded either negatively or positively depending on the expected direction of the residual error. A wireless communication method.

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