Wireless device, base station, and communication method

Abstract

A wireless device according to the present invention includes: a control unit that executes, for a plurality of endpoints to be applied to beamforming by an uplink demodulation reference signal, a setting for applying at least one window for receiving the demodulation reference signal for each of the plurality of endpoints; and a reception unit that receives the demodulation reference signal in the window.

Description

Wireless device, base station, and communication method

[0001] The present invention relates to a wireless device, a base station, and a communication method in a wireless communication system.

[0002] NR (New Radio) (also called "5G"), the successor system to LTE (Long Term Evolution), introduces technologies that satisfy requirements such as a large-capacity system, high-speed data transmission speed, low latency, simultaneous connection of a large number of terminals, low cost, and low power consumption (for example, Non-Patent Document 1).

[0003] Furthermore, in the O-RAN standardization, Uplink Performance Improvement (UPLI) in Massive MIMO (Multiple Input Multiple Output) is being considered for next-generation wireless access networks.

[0004] 3GPP TS 23.501 V18.1.0 (2023-03)

[0005] In UPLI, to prevent information loss between the O-RU and the O-DU, channel estimation, which was previously performed in the O-DU (Open-Distributed Unit), is now performed in the O-RU (Open-Radio Unit). When performing channel estimation using a demodulation reference signal (DMRS), the O-RU needs to set a reception and / or transmission window for the uplink DMRS. From the perspective of performance improvement, flexible setting is desirable for this setting, but from the perspective of operation, complex setting processing is undesirable.

[0006] The present invention has been made in view of the above points, and has an object to appropriately set reception and / or transmission windows for uplink DMRS in a wireless communication system.

[0007] According to the disclosed technology, a wireless device is provided that has a control unit that performs setting to apply at least one window for receiving a demodulation reference signal for each of multiple endpoints that are applied to beamforming using an uplink demodulation reference signal, and a receiving unit that receives the demodulation reference signal in the window.

[0008] The disclosed technology provides a technology for appropriately setting a reception and / or transmission window for an uplink DMRS in a wireless communication system.

[0009] FIG. 1 is a diagram showing a configuration example (1) of a wireless communication system according to an embodiment of the present invention. FIG. 2 is a diagram showing a configuration example (2) of a wireless communication system according to an embodiment of the present invention. FIG. 3 is a diagram showing a configuration example of a base station 10 according to an embodiment of the present invention. FIG. 4 is a diagram showing a reception and / or transmission window according to an embodiment of the present invention. FIG. 5 is a diagram showing a first method according to an embodiment of the present invention. FIG. 6 is a diagram showing a second method according to an embodiment of the present invention. FIG. 7 is a diagram showing a third method according to an embodiment of the present invention. FIG. 8 is a diagram showing a fourth method according to an embodiment of the present invention. FIG. 9 is a second diagram showing the fourth method according to an embodiment of the present invention. FIG. 10 is a diagram showing a configuration example of a distribution device according to an embodiment of the present invention. FIG. 11 is a diagram showing an example of a configuration of a wireless device according to an embodiment of the present invention. FIG. 12 is a diagram showing an example of the hardware configuration of a wireless device or a distribution device according to an embodiment of the present invention. FIG. 13 is a diagram showing a configuration example of a vehicle according to an embodiment of the present invention.

[0010] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Note that the embodiment described below is an example, and the embodiment to which the present invention is applied is not limited to the following embodiment.

[0011] In the operation of the wireless communication system according to the embodiment of the present invention, existing technologies are used as appropriate. However, the existing technologies are, for example, the existing LTE or the existing NR, but are not limited to the existing LTE or NR.

[0012] In addition, in the embodiments of the present invention described below, terminology used in existing NRs, etc. will be used, but this is for convenience of description, and similar signals, functions, etc. may be called by other names.

[0013] Furthermore, in the embodiment of the present invention, the duplex method may be a time division duplex (TDD) method, a frequency division duplex (FDD) method, or another method (for example, flexible duplex, etc.).

[0014] Furthermore, in the embodiments of the present invention, "configuring" radio parameters etc. may mean that predetermined values ​​are pre-configured, or that radio parameters notified from the base station 10 or the terminal 20 are set.

[0015] (System Configuration Example) Fig. 1 is a diagram showing a configuration example (1) of a wireless communication system according to an embodiment of the present invention. As shown in Fig. 1, the wireless communication system according to the embodiment of the present invention includes a base station 10 and a terminal 20. Although Fig. 1 shows one base station 10 and one terminal 20, this is an example, and there may be a plurality of each. Note that the base station 10 according to the present embodiment specifically includes an O-RU (O-RAN Radio Unit) and an O-DU (O-RAN Distributed Unit), the details of which will be described later.

[0016] The base station 10 is a communication device that provides one or more cells and performs wireless communication with the terminal 20. The physical resources of a wireless signal are defined in the time domain and the frequency domain. The time domain may be defined by the number of Orthogonal Frequency Division Multiplexing (OFDM) symbols, and the frequency domain may be defined by the number of subcarriers or resource blocks. The base station 10 transmits a synchronization signal and system information to the terminal 20. The synchronization signal may be, for example, NR-PSS and NR-SSS. The system information is transmitted, for example, via NR-PBCH and is also referred to as broadcast information. The synchronization signal and system information may be referred to as SSB (SS / PBCH block). The SSB may be referred to as a synchronization signal or a synchronization signal block. As shown in FIG. 1, the base station 10 transmits control signals or data to the terminal 20 via DL (Downlink) and receives control signals or data from the terminal 20 via UL (Uplink). Both the base station 10 and the terminal 20 are capable of transmitting and receiving signals by performing beamforming. Furthermore, both the base station 10 and the terminal 20 can apply MIMO (Multiple Input Multiple Output) communication to DL or UL. Furthermore, both the base station 10 and the terminal 20 may communicate via a secondary cell (SCell: Secondary Cell) and a primary cell (PCell: Primary Cell) using CA (Carrier Aggregation). Furthermore, the terminal 20 may communicate via a primary cell of the base station 10 and a primary secondary cell group cell (PSCell: Primary SCG Cell) of another base station 10 using DC (Dual Connectivity).

[0017] The terminal 20 is a communication device equipped with a wireless communication function, such as a smartphone, a mobile phone, a tablet, a wearable terminal, an IoT terminal, or an M2M (Machine-to-Machine) communication module. As shown in Fig. 1, the terminal 20 receives control signals or data from the base station 10 via DL and transmits control signals or data to the base station 10 via UL, thereby utilizing various communication services provided by the wireless communication system. The terminal 20 also receives various reference signals transmitted from the base station 10 and measures propagation path quality based on the reception results of the reference signals.

[0018] The terminal 20 is capable of performing carrier aggregation, which aggregates multiple cells (multiple CCs (Component Carriers)) to communicate with the base station 10. In carrier aggregation, one PCell (Primary cell) and one or more SCells (Secondary cells) are used. Also, a PUCCH-SCell having a PUCCH may be used.

[0019] Fig. 2 is a diagram showing a configuration example (2) of a wireless communication system according to an embodiment of the present invention. Fig. 2 shows a configuration example of a wireless communication system in which DC (Dual Connectivity) is implemented. As shown in Fig. 2, a base station 10A serving as a Master Node (MN) and a base station 10B serving as a Secondary Node (SN) are provided. The base station 10A and the base station 10B are each connected to a core network. The terminal 20 can communicate with both the base station 10A and the base station 10B.

[0020] The cell group provided by the base station 10A, which is an MN, is called an MCG (Master Cell Group), and the cell group provided by the base station 10B, which is an SN, is called an SCG (Secondary Cell Group). In addition, in DC, the MCG is composed of one PCell and one or more SCells, and the SCG is composed of one PSCell (Primary SCG Cell) and one or more SCells.

[0021] The processing operations in this embodiment may be executed in the system configuration shown in FIG. 1, in the system configuration shown in FIG. 2, or in any other system configuration.

[0022] The O-RAN standardization is considering Uplink Performance Improvement (UPLI) for Massive MIMO in next-generation wireless access networks. UPLI prevents information loss between the O-RU and the O-DU by performing channel estimation of the demodulation reference signal (DMRS) and calculation of the beam forming weight (BWF), which were previously performed in the O-DU.

[0023] In addition, two configurations are being considered for the O-RAN standardization: "DMRS-BF-EQ," in which DMRS-related processing and uplink equalization are performed by the O-RU; and "DMRS-BF-NEQ," in which DMRS-related processing is performed by the O-RU and O-DU, and uplink equalization is performed by the O-DU.

[0024] FIG. 3 is a diagram showing an example of the configuration of a base station 10 according to an embodiment of the present invention. The base station 10 shown in FIG. 3 includes an O-DU 11, an O-RU 12A that supports a DMRS-BF-NEQ configuration, and an O-RU 12B that supports a DMRS-BF-EQ configuration. The O-DU 11 is connected to the O-RU 12A and the O-RU 12B via lines. This line connection configuration may be point-to-point, or may be via a layer 2 switch or the like. Hereinafter, when there is no need to distinguish between the O-RU 12A and the O-RU 12B, they will be referred to as O-RU 12.

[0025] In this embodiment, the O-DU 11 may be called a distributed device, and the O-RU 12 may be called a radio device. The O-DU 11 is a logical node that includes a function for setting or controlling the O-RU 12. The O-RU 12 is a logical node that includes a function for performing RF processing.

[0026] As a protocol stack for communication between the O-DU 11 and the O-RU 12, the C-Plane is used to transfer control signals, and the U-Plane is used to transfer user data. The S-Plane is a protocol for achieving synchronization between devices. The M-Plane is a management plane that handles maintenance and monitoring signals. Information can be sent from the O-DU 11 to the O-RU 12 using the M-Plane.

[0027] Also, O-DU11 may be replaced with DU, and O-RU12 with RU.

[0028] (Massive MIMO Method) FIG. 4 is a diagram for explaining the Massive MIMO method. FIG. 4 shows an outline of the processing in the first method (Cat. B Weight-based) and the second method (Cat. B CH-info-based) that have been established in the O-RAN standardization, and the third method (ULPI DMRS-BF-NEQ) and the fourth method (DMRS-BF-EQ) that are currently being considered in the O-RAN standardization. An uplink signal (UL signal) received by the base station 10 is first input to the O-RU and processed, and then the output is input to the O-DU, where further processing is performed. The processing performed includes beamforming (BF), beamforming weight calculation, sounding reference signal (SRS) channel estimation, DMRS channel estimation, combine, equalize, etc. In the first method, beamforming is performed in the O-RU, and processing other than beamforming is performed in the O-DU. In the second scheme, BF and BF weight calculations are performed in the O-RU, and processing other than BF and BF weight calculations is performed in the O-DU. In the third scheme, DMRS channel estimation and combining are performed in the O-RU, and DMRS channel estimation and combining / equalizing are performed in the O-DU. In the fourth scheme, DMRS channel estimation and combining / equalizing are performed in the O-RU. However, the third and fourth schemes are currently being formulated in the O-RAN standardization, and it has not yet been determined whether SRS channel estimation will be performed in the O-RU or the O-DU, so the processing shown by the dotted lines may not be performed. As can be seen from this configuration, the processing load in the O-RU is the smallest in the first scheme and the largest in the fourth scheme, while the processing load in the O-DU is the largest in the first scheme and the smallest in the fourth scheme.

[0029] (Uplink signal demodulation operation) When beamforming and equalization processing (beamforming / equalization) is performed in the ULPI using the decoded reference signal (PUSCH DMRS) of the uplink shared channel, the delay increases by the amount of delay in the reception timing and the transmission timing to the O-DU. Therefore, taking into account the processing delay, it is necessary to receive the DMRS symbol in the O-RU and transmit it to the O-DU early.

[0030] The waiting window (reception and / or transmission window) for processing the uplink signal (UL signal) transmitted from the antenna to the O-RU has conventionally been defined as the difference between the maximum and minimum values ​​of two propagation allowance times called Ta3_max and Ta3_min (window = Ta3_max - Ta3_min). In ULPI, the position of this window needs to be appropriately shifted. FIG. 5 is a diagram illustrating the reception and / or transmission window in an embodiment of the present invention. As shown in FIG. 5, the uplink DMRS is received in the window between Ta3_min and Ta3_max. In the example of FIG. 5, the DMRS is allocated to one symbol in the slot, but up to four symbols may be allocated depending on the DMRS configuration (DMRS config). It may also be allocated to two consecutive symbols.

[0031] In the O-RAN standardization, it has been agreed that beamforming processing using DMRS (BMRS-BF) is configured for each endpoint (hereinafter referred to as "EP"). That is, BF methods other than DMRS-BF (weight-based, channel-info, etc.) may be applied to each EP.

[0032] (Example) An example will be described. In the example, a method for applying a shift in the reception and / or transmission window position in uplink demodulation reference signal-based beamforming (DMRS-BF) to ULPI-applied symbols in the O-RU 12 will be described.

[0033] (First Method) In the first method, one common window is set for endpoints to which DMRS-BF is applied. Fig. 6 is a diagram for explaining the first method in an embodiment of the present invention. As shown in Fig. 6, a first window (window #1) is set for a first EP (EP #1), and window #1 is applied to all DMRSs received by EP #1. In the example of Fig. 6, window #1 is applied to the configuration information of three DMRSs (DMRS config #1 to #3).

[0034] The first method is simple to configure, which reduces the costs of configuration and operation. However, it requires a fixed window regardless of the DMRS position within the slot, which results in a lack of flexibility in configuration and makes it difficult to optimize ULPI performance.

[0035] (Second Method) In the second method, a window is set for each endpoint to which DMRS-BF is applied. Fig. 7 is a diagram illustrating the second method according to an embodiment of the present invention. As shown in Fig. 7, a different window (window #1-3) is set for each of three endpoints (EP #1-EP #3). In the example of Fig. 7, one window (window #1-window #3) is applied to each of the configuration information related to three DMRSs (DMRS config #1-DMRS config #3). Alternatively, multiple windows may be applied to one DMRS config.

[0036] The second method makes it possible to set an optimal window depending on the location of the DMRS, but it is necessary to increase the number of endpoints to be set for each location of the DMRS.

[0037] (Third Method) In the third method, multiple windows are set for an endpoint to which DMRS-BF is applied. Fig. 8 is a diagram illustrating the third method according to an embodiment of the present invention. As shown in Fig. 8, three windows (window #1-3) are set for one endpoint (EP #1). In the example of Fig. 8, one window (window #1-3) is applied to each of the configuration information related to three DMRSs (DMRS config #1-#3). Alternatively, multiple windows may be applied to one DMRS config.

[0038] The third method allows for setting an optimal window depending on the location of the DMRS without increasing the number of endpoints, but the setting for each endpoint becomes complicated.

[0039] (Fourth Method) In the fourth method, multiple windows are configured for endpoints to which DMRS-BF is applied, and multiple endpoints can be configured. FIG. 9 is a diagram illustrating the fourth method according to an embodiment of the present invention. As shown in FIG. 9, for example, two windows, window #1 and window #2, can be configured for EP #1, and two windows, window #3 and window #4, can be configured for EP #2. Here, the four windows (window #1-#4) are applied to DMRS config #1-4, respectively. Alternatively, multiple windows may be applied to the configuration related to one DMRS. FIG. 10 is a second diagram illustrating the fourth method according to an embodiment of the present invention. As shown in FIG. 10, a DMRS according to the configuration information of DMRS config #1 is transmitted using two symbols in EP #1, and window #1 is applied to this configuration information. A DMRS according to the configuration information of DMRS config #2 is transmitted using one symbol in EP #1 and one symbol in EP #2, and window #1 and window #3 are applied, respectively. The DMRS according to the configuration information of DMRS config#3 is transmitted using two symbols in EP#1 and two symbols in EP#2, and window#2 and window#4 are applied as windows, respectively.

[0040] The settings shown in Figures 9 and 10 are examples, and for example, different windows may be applied to each of the two DMRS symbols in DMRS config #1, and different windows may be applied to each of the four DMRS symbols in DMRS config #3.

[0041] That is, in the fourth method, the O-RU 12 configures multiple endpoints to be used for beamforming using uplink demodulation reference signals, and applies at least one window for receiving the demodulation reference signals for each endpoint, and receives the demodulation reference signals in the configured window. Also, in the fourth method, one window may be applied to the demodulation reference signal configuration information (DMRS-config) that configures the symbol position of at least one demodulation reference signal. Alternatively, in the fourth method, multiple windows may be allowed to be applied to the demodulation reference signal configuration information (DMRS-config) that configures the symbol position of at least one demodulation reference signal.

[0042] The fourth method combines the functions of the second and third methods, allowing for more flexible configuration, and by taking into account performance improvements and configuration complexity in UPLI, it is possible to achieve more optimal configuration.

[0043] (Method for notifying settings) The settings related to the endpoints and windows in the above-described first to fourth methods may be dynamically notified from the O-DU 11 to the O-RU 12 by a C-Plane signal. Alternatively, the settings may be fixedly notified as initial settings from the O-DU 11 or an NMS (Network Management System) to the O-RU 12 by an M-Plane signal. Alternatively, the O-RU 12 may implicitly determine the settings based on the received DMRS or DMRS-related setting information (DMRS Config).

[0044] Furthermore, the O-RU 12 may transmit a notification regarding the endpoint and window settings and / or the capability of the O-RU 12 in the first to fourth methods described above to the O-DU 11. The notification may also include information regarding the window to be used and / or the window that is available for use. This allows the O-DU 11 and the O-RU 12 to share information regarding the settings and capabilities.

[0045] The above-described embodiment enables appropriate setting of uplink DMRS reception and / or transmission windows in a wireless communication system. For example, in Uplink Performance Improvement (UPLI), multiple uplink DMRS reception and / or transmission windows can be set for each endpoint to which DMRS-BF is applied. Furthermore, the O-RU 12 can transmit, to the O-DU 11, information on channel estimation calculated based on the received demodulation reference signal.

[0046] (Device Configuration) Next, a description will be given of an example of the functional configuration of the O-DU 11 and O-RU 12 that perform the processes and operations described above. The O-DU 11 may be called a distributed device, and the O-RU 12 may be called a wireless device.

[0047] <O-DU11> Fig. 11 is a diagram showing an example of the functional configuration of the O-DU11. As shown in Fig. 11, the O-DU11 has a transmitting unit 110, a receiving unit 120, a setting unit 130, and a control unit 140. The functional configuration shown in Fig. 11 is merely an example. As long as the operations related to the embodiment of the present invention can be executed, the names of the functional divisions and functional units may be any. Furthermore, the transmitting unit 110 and the receiving unit 120 may be collectively referred to as a communication unit.

[0048] The transmitting unit 110 has a function of generating a signal (information) to be transmitted to the terminal 20 side and transmitting the signal to the O-RU 12. The receiving unit 120 receives the signal transmitted from the O-RU 12.

[0049] The setting unit 130 stores the setting information in a storage device provided in the setting unit 130, reads it out from the storage device as needed, and transmits it to the terminal 20, for example, via the transmission unit 110. The control unit 140 executes control related to the processing of the O-DU 11. The transmission unit 110 may be called a transmitter, and the reception unit 120 may be called a receiver.

[0050] <O-RU 12> Fig. 12 is a diagram showing an example of the functional configuration of the O-RU 12. As shown in Fig. 12, the O-RU 12 has a transmitting unit 210, a receiving unit 220, a setting unit 230, and a control unit 240. The functional configuration shown in Fig. 12 is merely an example. As long as the operations related to the embodiment of the present invention can be executed, the names of the functional divisions and functional units may be any. The transmitting unit 210 and the receiving unit 220 may be collectively referred to as a communication unit.

[0051] The transmitting unit 210 transmits signals to the terminal 20 and to the O-DU 11. More specifically, the transmitting unit 210 includes an antenna that transmits signals to the terminal 20 and a transmitting function (e.g., an interface unit with an optical fiber) that transmits signals to the O-DU 11.

[0052] The receiving unit 220 receives signals from the terminal 20 and from the O-DU 11. More specifically, the receiving unit 220 includes an antenna that receives signals from the terminal 20 and a receiving function that receives signals from the O-DU 11 (e.g., an interface unit with an optical fiber).

[0053] The setting unit 230 stores the setting information in a storage device provided in the setting unit 230 and reads it out from the storage device as needed. The setting unit 230 also stores setting information that is set in advance.

[0054] The control unit 240 controls the O-RU 12 .

[0055] This specification discloses at least the following notes.

[0056] <Supplementary Notes> (Supplementary Item 1) A wireless device comprising: a control unit that performs configuration for multiple endpoints to be applied to beamforming using uplink demodulation reference signals, the control unit performing configuration for applying at least one window for receiving the demodulation reference signals for the multiple endpoints; and a receiving unit that receives the demodulation reference signals in the window. (Supplementary Item 2) The wireless device according to Supplementary Item 1, wherein the control unit applies one window to configuration information of the demodulation reference signals that sets a symbol position of at least one of the demodulation reference signals. (Supplementary Item 3) The wireless device according to Supplementary Item 1, wherein the control unit allows multiple windows to be applied to configuration information of the demodulation reference signals that sets a symbol position of at least one of the demodulation reference signals. (Supplementary Item 4) The wireless device according to Supplementary Item 1, wherein the receiving unit receives a notification regarding the configuration performed by the control unit at the time of initial setup or dynamically. a transmitting unit that transmits notification regarding the setting to the wireless device and a receiving unit that receives information regarding the channel estimation from the wireless device. (Supplementary Item 5) A base station comprising: a wireless device having: a control unit that performs setting, for multiple endpoints to be applied to beamforming using uplink demodulation reference signals, to apply at least one window for receiving the demodulation reference signals for the multiple endpoints, the multiple endpoints receiving the demodulation reference signals in the window; a receiving unit that receives the demodulation reference signals in the window and receives from a distribution device a notification regarding the setting performed by the control unit; and a transmitting unit that transmits notification regarding the setting to the wireless device and a receiving unit that receives information regarding the channel estimation from the wireless device. (Supplementary Item 6) A communication method performed by a wireless device comprising: a step of performing setting, for multiple endpoints to be applied to beamforming using uplink demodulation reference signals, to apply at least one window for receiving the demodulation reference signals for the multiple endpoints, and a step of receiving the demodulation reference signals in the window.

[0057] Any of Supplementary Items 1 to 6 allows the window for uplink DMRS to be appropriately set in a wireless communication system.

[0058] (Hardware Configuration) The block diagrams (FIGS. 11 and 12) used to explain the above embodiments show functional blocks. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method for realizing each functional block is not particularly limited. That is, each functional block may be realized using a single device that is physically or logically coupled, or may be realized using two or more physically or logically separated devices that are directly or indirectly connected (for example, using wires, wirelessly, etc.) and these multiple devices. The functional block may be realized by combining software with the single device or the multiple devices.

[0059] Functions include, but are not limited to, judgment, determination, assessment, 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, 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 these functions are implemented.

[0060] For example, the O-DU11, O-RU12, etc. according to an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. Figure 13 is a diagram showing an example of the hardware configuration of the O-DU11 and O-RU12 according to an embodiment of the present disclosure. The above-described O-DU11 and O-RU12 may be physically configured as a computer device including a processor 1001, a storage device 1002, an auxiliary storage device 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0061] In the following description, the term "device" can be read as a circuit, a device, a unit, etc. The hardware configuration of the O-DU11 and the O-RU12 may be configured to include one or more of the devices shown in the figure, or may be configured to exclude some of the devices.

[0062] Each function in O-DU11 and O-RU12 is realized by loading specified software (programs) onto hardware such as processor 1001 and memory device 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 device 1002 and auxiliary memory device 1003.

[0063] The processor 1001 controls the entire computer by running, for example, an operating system. The processor 1001 may be configured as 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 140, control unit 240, etc. may be realized by the processor 1001.

[0064] Furthermore, the processor 1001 reads programs (program code), software modules, data, etc. from at least one of the auxiliary storage device 1003 and the communication device 1004 into the storage device 1002 and executes various processes in accordance with these. The program used is a program that causes a computer to execute at least some of the operations described in the above-described embodiments. For example, the control unit 140 of the O-DU 11 shown in FIG. 11 may be stored in the storage device 1002 and implemented by a control program running on the processor 1001. Furthermore, for example, the control unit 240 of the O-RU 12 shown in FIG. 12 may be stored in the storage device 1002 and implemented by a control program running on the processor 1001. While the various processes described above have been described as being executed by one processor 1001, they may also be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 may be implemented on one or more chips. The program may also be transmitted from a network via a telecommunications line.

[0065] The storage device 1002 is a computer-readable recording medium and may be configured, for example, by at least one of a read-only memory (ROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), a random access memory (RAM), etc. The storage device 1002 may also be called a register, a cache, a main memory, etc. The storage device 1002 can store executable programs (program codes), software modules, etc. for implementing a communication method according to an embodiment of the present disclosure.

[0066] The secondary storage device 1003 is a computer-readable recording medium, and may be, for example, at least one of 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, etc. The above-mentioned storage medium may be, for example, a database, a server, or other appropriate medium including at least one of the storage device 1002 and the secondary storage device 1003.

[0067] The communication device 1004 is hardware (transmission / reception device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, or a communication module. The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. to realize at least one of frequency division duplex (FDD) and time division duplex (TDD). For example, a transmission / reception antenna, an amplifier unit, a transmission / reception unit, a transmission path interface, etc. 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.

[0068] The input device 1005 is an input device (e.g., 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 (e.g., a display, a speaker, an LED lamp, etc.) that outputs to the outside. Note that the input device 1005 and the output device 1006 may be integrated into one device (e.g., a touch panel).

[0069] Furthermore, each device such as the processor 1001 and the storage device 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.

[0070] Furthermore, the O-DU 11 and the O-RU 12 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.

[0071] Furthermore, the O-DU11 or the O-RU12 may be provided in the vehicle 2001. Fig. 14 shows an example configuration of the vehicle 2001. As shown in Fig. 14, the vehicle 2001 includes a drive unit 2002, a steering unit 2003, an accelerator pedal 2004, a brake pedal 2005, a shift lever 2006, front wheels 2007, rear wheels 2008, an axle 2009, an electronic control unit 2010, various sensors 2021 to 2029, an information service unit 2012, and a communication module 2013. The O-DU11 or the O-RU12 according to each aspect / embodiment described in the present disclosure may be applied to a communication device mounted on the vehicle 2001, and may be applied to the communication module 2013, for example.

[0072] The drive unit 2002 is configured, for example, by an engine, a motor, or a hybrid of an engine and a motor. The steering unit 2003 includes at least a steering wheel (also called a handle) and is configured to steer at least one of the front wheels and the rear wheels based on the operation of the steering wheel operated by the user.

[0073] The electronic control unit 2010 is composed of a microprocessor 2031, a memory (ROM, RAM) 2032, and a communication port (IO port) 2033. Signals are input to the electronic control unit 2010 from various sensors 2021 to 2029 provided in the vehicle 2001. The electronic control unit 2010 may also be called an ECU (Electronic Control Unit).

[0074] The signals from the various sensors 2021 to 2029 include a current signal from a current sensor 2021 that senses the current of the motor, a rotation speed signal of the front and rear wheels obtained by a rotation speed sensor 2022, an air pressure signal of the front and rear wheels obtained by an air pressure sensor 2023, a vehicle speed signal obtained by a vehicle speed sensor 2024, an acceleration signal obtained by an acceleration sensor 2025, an accelerator pedal depression amount signal obtained by an accelerator pedal sensor 2029, a brake pedal depression amount signal obtained by a brake pedal sensor 2026, a shift lever operation signal obtained by a shift lever sensor 2027, and a detection signal for detecting obstacles, vehicles, pedestrians, etc. obtained by an object detection sensor 2028.

[0075] The information service unit 2012 is composed of various devices, such as a car navigation system, an audio system, speakers, a television, and a radio, for providing (outputting) various types of information, such as driving information, traffic information, and entertainment information, and one or more ECUs for controlling these devices. The information service unit 2012 uses information acquired from external devices via the communication module 2013 or the like to provide various types of multimedia information and multimedia services to the occupants of the vehicle 2001. The information service unit 2012 may include input devices (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, a touch panel, etc.) that accept input from the outside, and may also include output devices (e.g., a display, a speaker, an LED lamp, a touch panel, etc.) that output information to the outside.

[0076] The driving assistance system unit 2030 is composed of various devices that provide functions for preventing accidents and reducing the driving burden on the driver, such as millimeter-wave radar, LiDAR (Light Detection and Ranging), cameras, positioning locators (e.g., GNSS, etc.), map information (e.g., high-definition (HD) maps, autonomous vehicle (AV) maps, etc.), gyro systems (e.g., IMU (Inertial Measurement Unit), INS (Inertial Navigation System), etc.), AI (Artificial Intelligence) chips, and AI processors, as well as one or more ECUs that control these devices. In addition, the driving assistance system unit 2030 transmits and receives various information via the communication module 2013 to realize the driving assistance function or the autonomous driving function.

[0077] The communication module 2013 can communicate with the microprocessor 2031 and components of the vehicle 2001 via the communication port. For example, the communication module 2013 transmits and receives data via the communication port 2033 to and from the drive unit 2002, steering unit 2003, accelerator pedal 2004, brake pedal 2005, shift lever 2006, front wheels 2007, rear wheels 2008, axle 2009, microprocessor 2031 and memory (ROM, RAM) 2032 in the electronic control unit 2010, and sensors 2021 to 29, which are provided in the vehicle 2001.

[0078] The communication module 2013 is a communication device that can be controlled by the microprocessor 2031 of the electronic control unit 2010 and can communicate with an external device. For example, it transmits and receives various information to and from the external device via wireless communication. The communication module 2013 may be located either inside or outside the electronic control unit 2010. The external device may be, for example, a base station, a mobile station, or the like.

[0079] The communication module 2013 may transmit at least one of signals from the above-mentioned various sensors 2021-2028 input to the electronic control unit 2010, information obtained based on the signals, and information based on input from the outside (user) obtained via the information service unit 2012 to an external device via wireless communication. The electronic control unit 2010, the various sensors 2021-2028, the information service unit 2012, etc. may be referred to as input units that accept input. For example, the PUSCH transmitted by the communication module 2013 may include information based on the above-mentioned input.

[0080] The communication module 2013 receives various information (traffic information, traffic signal information, vehicle-to-vehicle information, etc.) transmitted from external devices and displays it on an information service unit 2012 provided in the vehicle 2001. The information service unit 2012 may be called an output unit that outputs information (for example, outputs information to a device such as a display or speaker based on the PDSCH (or data / information decoded from the PDSCH) received by the communication module 2013). The communication module 2013 also stores the various information received from external devices in a memory 2032 that can be used by the microprocessor 2031. Based on the information stored in the memory 2032, the microprocessor 2031 may control the drive unit 2002, steering unit 2003, accelerator pedal 2004, brake pedal 2005, shift lever 2006, front wheels 2007, rear wheels 2008, axles 2009, sensors 2021 to 2029, etc. provided in the vehicle 2001.

[0081] (Supplementary Notes on the Embodiments) Although the embodiments of the present invention have been described above, the disclosed invention is not limited to such embodiments, and those skilled in the art will understand various modifications, alterations, alternatives, and substitutions. While specific numerical examples have been used to facilitate understanding of the invention, unless otherwise specified, these numerical values ​​are merely examples, and any appropriate values ​​may be used. The division of items in the above description is not essential to the present invention; matters described in two or more items may be used in combination as needed, and matters described in one item may apply to matters described in another item (as long as there is no contradiction). Boundaries between functional units or processing units in the functional block diagram do not necessarily correspond to physical component boundaries. The operations of multiple functional units may be physically performed by a single component, or the operations of one functional unit may be physically performed by multiple components. The order of the processing procedures described in the embodiments may be reversed as long as there is no contradiction. For convenience of processing description, the O-DU11 and O-RU12 have been described using functional block diagrams, but such devices may be realized in hardware, software, or a combination thereof. The software operated by the processor of O-DU11 in accordance with an embodiment of the present invention and the software operated by the processor of O-RU12 in accordance with an embodiment of the present invention may each be stored in random access memory (RAM), flash memory, read-only memory (ROM), EPROM, EEPROM, register, hard disk (HDD), removable disk, CD-ROM, database, server, or any other suitable storage medium.

[0082] 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., 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. 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.

[0083] Each aspect / embodiment described in the present disclosure may be implemented using any of the following standards: LTE (Long Term Evolution), LTE-Advanced (LTE-A), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system), 6th generation mobile communication system (6G), xth generation mobile communication system (xG) (xG (x is, for example, an integer or a decimal number)), FRA (Future Radio Access), NR (new Radio), New radio access (NX), Future generation radio access (FX), 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 802.17 (WiMAX (registered trademark)), IEEE 802.19 (WiMAX (registered trademark)), IEEE 802.20 (WiMAX (registered trademark)), IEEE 802.21 (Wi-Fi (registered trademark)), IEEE 802.22 (WiMAX (registered trademark)), IEEE 802.23 (WiMAX (registered trademark)), IEEE 802.24 (WiMAX (registered trademark)), IEEE 802.25 (WiMAX (registered trademark)), IEEE 802.26 (WiMAX (registered trademark)), IEEE 802.27 (WiMAX (registered trademark)), IEEE 802.28 (WiMAX (registered trademark)), IEEE 802.29 (WiMAX (registered trademark)), IEEE 802.30 (WiMAX (registered trademark)), IEEE 802.31 (Wi-Fi (registered trademark)), IEEE 802.32 (WiMAX (registered trademark)), IEEE 802.33 (WiMAX (registered trademark)), IEEE 802.34 ( The present invention may be applied to at least one of systems using 802.20, UWB (Ultra-Wide Band), Bluetooth (registered trademark), or other suitable systems, and next-generation systems that are extended, modified, created, or defined based on these systems. The present invention may also be applied to a combination of multiple systems (e.g., a combination of LTE and / or LTE-A with 5G).

[0084] The order of the procedures, sequences, flowcharts, etc. of each aspect / embodiment described herein may be rearranged 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.

[0085] In this specification, a specific operation described as being performed by the base station 10 may be performed by its upper node in some cases. In a network consisting of one or more network nodes having the base station 10, it is clear that various operations performed for communication with the terminal 20 may be performed by at least one of the base station 10 and another network node other than the base station 10 (such as, but not limited to, an MME or an S-GW). Although the above example illustrates a case where there is one other network node other than the base station 10, the other network node may be a combination of multiple other network nodes (such as an MME and an S-GW).

[0086] The information, signals, etc. described in the present disclosure 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.

[0087] Input and output information may be stored in a specific location (for example, memory) or may be managed using a management table. Input and output information may be overwritten, updated, or added to. Output information may be deleted. Input information may be transmitted to another device.

[0088] In the present disclosure, the determination may be made by a value represented by one bit (0 or 1), by a Boolean value (true or false), or by a comparison of numerical values ​​(e.g., comparison with a predetermined value).

[0089] 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.

[0090] 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.

[0091] 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.

[0092] Note that terms described 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.

[0093] As used in this disclosure, the terms "system" and "network" are used interchangeably.

[0094] Furthermore, the information, parameters, etc. described in the present disclosure may be expressed using absolute values, may be expressed using relative values ​​from a predetermined value, or may be expressed using other corresponding information. For example, a radio resource may be indicated by an index.

[0095] 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.

[0096] In the present disclosure, terms such as "base station (BS)," "radio base station," "base station," "fixed station," "NodeB," "eNodeB (eNB)," "gNodeB (gNB)," "access point," "transmission point," "reception point," "transmission / reception point," "cell," "sector," "cell group," "carrier," and "component carrier" may be used interchangeably. A base station may also be referred to by terms such as a macrocell, a small cell, a femtocell, and a picocell.

[0097] A base station can accommodate one or more (e.g., three) cells. When a base station accommodates multiple cells, the overall coverage area of ​​the base station can be 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 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.

[0098] In the present disclosure, the base station transmitting information to a terminal may be interpreted as the base station instructing the terminal to control or operate based on the information.

[0099] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," etc. may be used interchangeably.

[0100] 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.

[0101] At least one of the base station and the mobile station may be referred to as 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, the mobile object itself, etc. The mobile object refers to a movable object, and may move at any speed. Naturally, this also includes cases where the mobile object is stationary. Examples of the mobile object include, but are not limited to, vehicles, transport vehicles, automobiles, motorcycles, bicycles, connected cars, excavators, bulldozers, wheel loaders, dump trucks, forklifts, trains, buses, handcars, rickshaws, ships and other watercraft, airplanes, rockets, satellites, drones (registered trademark), multicopters, quadcopters, balloons, and objects mounted thereon. The mobile object may also be a mobile object that moves autonomously based on an operational command. It 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 be a device that does not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an IoT (Internet of Things) device such as a sensor.

[0102] Furthermore, a base station in the present disclosure may be read as a 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 terminal is replaced with communication between a plurality of terminals 20 (which may be referred to as, for example, D2D (Device-to-Device) or V2X (Vehicle-to-Everything)). In this case, the terminal 20 may be configured to have the functions of the 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, terms such as an uplink channel and a downlink channel may be read as a side channel.

[0103] Similarly, the term "terminal" in the present disclosure may be read as "base station." In this case, the base station may be configured to have the functions of the terminal described above.

[0104] 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.

[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 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.

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

[0107] 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] As used in this disclosure, any reference to an element using a designation such as "first," "second," etc. does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, a reference to a first and a second element does not imply that only two elements may be employed or that the first element must in some way precede the second element.

[0109] The "means" in the configuration of each of the above devices may be replaced with "part," "circuit," "device," etc.

[0110] When the terms "include," "including," and variations thereof are used in this disclosure, these terms are intended to be inclusive, similar to the term "comprising." Furthermore, when the term "or" is used in this disclosure, it is not intended to be an exclusive or.

[0111] A radio frame may be composed of one or more frames in the time domain. Each of the one or more frames in the time domain may be called a subframe. A subframe may further be composed of one or more slots in the time domain. A subframe may have a fixed time length (e.g., 1 ms) that is independent of numerology.

[0112] Numerology may be communication parameters that apply to the transmission and / or 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 the transceiver in the frequency domain, specific windowing operations performed by the transceiver in the time domain, etc.

[0113] A slot may be composed of one or more symbols (such as an Orthogonal Frequency Division Multiplexing (OFDM) symbol or a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol) in the time domain. A slot may be a time unit based on numerology.

[0114] A slot may include multiple minislots. Each minislot may consist of one or multiple symbols in the time domain. A minislot may also be called a subslot. A minislot may consist of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a minislot may be called PDSCH (or PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a minislot may be called PDSCH (or PUSCH) mapping type B.

[0115] 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.

[0116] For example, one subframe may be called a transmission time interval (TTI), multiple consecutive subframes may be called a TTI, or one slot or one minislot may be called a TTI. That is, at least one of the subframe and the TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (for example, 1-13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, minislot, or the like instead of a subframe. Furthermore, one slot may be called a unit time. The unit time may differ for each cell depending on the numerology.

[0117] 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 wireless resources (such as frequency bandwidth and transmission power that can be used by each terminal 20) to each terminal 20 in TTI units. Note that the definition of TTI is not limited to this.

[0118] 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.

[0119] 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.

[0120] 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.

[0121] 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 greater than or equal to 1 ms.

[0122] 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.

[0123] The time domain of an RB may include one or more symbols and may have a length of one slot, one minislot, one subframe, or one TTI. One TTI, one subframe, etc. may each be composed of one or more resource blocks.

[0124] 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, etc.

[0125] 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.

[0126] 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 the BWP.

[0127] 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 predetermined signal / channel outside the active BWP. Note that the terms "cell," "carrier," etc. in this disclosure may be read as "BWP."

[0129] The above-described structures of radio frames, subframes, slots, minislots, symbols, etc. are merely examples, and various changes may be made to 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.

[0130] 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.

[0131] 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."

[0132] The aspects / embodiments described in this disclosure may be used alone, in combination, or switched depending on the implementation. Notification of predetermined information (e.g., notification that "X is true") is not limited to explicit notification, but may be implicit (e.g., not notifying the predetermined information).

[0133] 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.

[0134] 10 Base station 11 O-DU 12A, 12B O-RU 110 Transmitter 120 Receiver 130 Setting unit 140 Control unit 20 Terminal 210 Transmitter 220 Receiver 230 Setting unit 240 Control unit 1001 Processor 1002 Storage device 1003 Auxiliary storage device 1004 Communication device 1005 Input device 1006 Output device 2001 Vehicle 2002 Drive unit 2003 Steering unit 2004 Accelerator pedal 2005 Brake pedal 2006 Shift lever 2007 Front wheels 2008 Rear wheels 2009 Axle 2010 Electronic control unit 2012 Information service unit 2013 Communication module 2021 Current sensor 2022 Rotation speed sensor 2023 Air pressure sensor 2024 Vehicle speed sensor 2025 Acceleration sensor 2026 Brake pedal sensor 2027 Shift lever sensor 2028 Object detection sensor 2029 Accelerator pedal sensor 2030 Driving assistance system unit 2031 Microprocessor 2032 Memory (ROM, RAM) 2033 Communication port (IO port)

Claims

1. A wireless device having: a control unit that executes settings for applying at least one window for receiving a demodulation reference signal for each of multiple endpoints to be applied to beamforming using an uplink demodulation reference signal; and a receiving unit that receives the demodulation reference signal in the window.

2. The wireless device according to claim 1, wherein the control unit applies one of the windows to setting information of the demodulation reference signal that sets a symbol position of at least one of the demodulation reference signals.

3. The wireless device according to claim 1, wherein the control unit allows a plurality of the windows to be applied to the demodulation reference signal setting information that sets the symbol position of at least one of the demodulation reference signals.

4. The wireless device of claim 1, wherein the receiver receives notification regarding the configuration performed by the controller during initial configuration or dynamically.

5. A base station comprising: a wireless device having: a control unit that executes settings for applying at least one window for receiving a demodulation reference signal for each of multiple endpoints to be applied to beamforming using an uplink demodulation reference signal; a receiving unit that receives the demodulation reference signal in the window and receives from a distribution device a notification regarding the settings executed by the control unit; and a transmitting unit that transmits to the distribution device information regarding channel estimation calculated based on the demodulation reference signal received by the receiving unit; and a distribution device having: a transmitting unit that transmits a notification regarding the settings to the wireless device; and a receiving unit that receives information regarding the channel estimation from the wireless device.

6. A communication method executed by a wireless device, comprising: a step of executing a setting for applying at least one window for receiving the demodulation reference signal for each of multiple endpoints to be applied to beamforming using an uplink demodulation reference signal; and a step of receiving the demodulation reference signal in the window.

Images