CN114128224A - Communication device and communication method - Google Patents

Abstract

A communication device is provided with: a transmission unit that transmits information indicating a range of amplification factors in which an amplifier of the own apparatus can operate appropriately to another communication apparatus; a reception unit configured to receive, from the other communication apparatus, a sampling sequence of an in-phase component and an orthogonal component of an OFDM (orthogonal frequency division multiplexing) signal of an amplification factor and a frequency domain set in the own apparatus; and a control unit that transmits a radio signal to which the amplification factor set for the own device based on the sampling sequence is applied.

Description

Communication device and communication method

Technical Field

The present invention relates to a communication apparatus and a communication method in a wireless communication system.

Background

In NR (New Radio) (also referred to as "5G") which is a system following LTE (Long Term Evolution), a technology that satisfies requirements such as a large capacity system, a high data transmission rate, low delay, simultaneous connection of a large number of terminals, low cost, and power saving is being studied (for example, non-patent document 1).

An O-RAN alliance is established for the purpose of promoting the development of the openness and intellectualization in a 5G RAN (Radio Access Network). Today, many operators and vendors federate the O-RAN alliance and conduct discussions related to openness.

In the O-RAN, a plurality of architectures are studied, and as one of them, an open Fronthaul (Fronthaul) interface that realizes interconnection of a baseband processing unit and a radio unit between different vendors is studied. As the functional group in the O-RAN, an O-DU (O-RAN Distributed unit) and an O-RU (O-RAN Radio unit) that are realized by separating a layer 2 function, baseband signal processing, and Radio signal processing are defined. The fronthaul interface corresponds to the interface between the O-DU and the O-RU.

Documents of the prior art

Non-patent document

Non-patent document 1: 3GPP TS 38.300 V15.6.0(2019-06)

Disclosure of Invention

Problems to be solved by the invention

In the O-RAN, the transmission power of an RF signal to be transmitted from an O-RU to a radio section is set from an O-DU. The O-DU sends the set value of the amplification and the sample value of the signal to the O-RU. However, when the set value of the amplification factor transmitted from the O-DU is not included in the range of the amplification factor at which the power amplifier provided in the O-RU can operate properly, there is a concern that: the linearity of the input/output signal of the power amplifier is not maintained, and signal transmission at a power different from the assumed power, distortion of the waveform of the transmission signal, and the like occur, and as a result, the terminal cannot correctly receive the downlink signal, and downlink communication cannot be correctly conducted.

The present invention has been made in view of the above-described circumstances, and an object thereof is to set an appropriate amplification factor for a radio functional unit including a power amplifier in a radio communication system.

Means for solving the problems

According to the disclosed technology, a communication device is provided with: a transmission unit that transmits information indicating a range of amplification factors in which an amplifier of the own apparatus can operate appropriately to another communication apparatus; a reception unit configured to receive, from the other communication device, a sampling sequence of an in-phase component and an Orthogonal component of an OFDM (Orthogonal Frequency Division Multiplexing) signal of an amplification factor and a Frequency domain set in the own device; and a control unit that transmits a radio signal to which the amplification factor set for the own device based on the sampling sequence is applied.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the disclosed technology, in a wireless communication system, an appropriate amplification factor can be set for a wireless functional unit including a power amplifier.

Drawings

Fig. 1 is a diagram showing an example of the structure of an O-RAN architecture.

Fig. 2 is a diagram showing a configuration example of the gNB 10.

Fig. 3 is a diagram for explaining signals between the O-DU10A and the O-RU 10B.

Fig. 4 is a diagram for explaining an example of a method of determining the transmission power of the O-RU 10B.

Fig. 5 is a timing diagram for explaining signals between the O-DU10A and the O-RU 10B.

Fig. 6 is a diagram for explaining an example (1) of setting the magnification in the embodiment of the present invention.

Fig. 7 is a diagram for explaining an example (2) of setting the magnification in the embodiment of the present invention.

Fig. 8 is a diagram for explaining an example (3) of setting the magnification in the embodiment of the present invention.

Fig. 9 is a diagram for explaining an example (4) of setting the magnification in the embodiment of the present invention.

Fig. 10 is a diagram showing an example (1) of a data model in the embodiment of the present invention.

Fig. 11 is a diagram showing an example (2) of a data model in the embodiment of the present invention.

Fig. 12 is a flowchart for explaining an example of the startup process in the embodiment of the present invention.

Fig. 13 is a diagram showing an example of a functional configuration of the base station 10 according to the embodiment of the present invention.

Fig. 14 is a diagram showing an example of the hardware configuration of the base station 10 according to the embodiment of the present invention.

Detailed Description

Embodiments of the present invention will be described below with reference to the drawings. The embodiments described below are examples, and the embodiments to which the present invention is applied are not limited to the embodiments described below.

In carrying out the operation of the wireless communication system of the embodiment of the present invention, the related art is suitably used. The existing technology is, for example, existing LTE, but is not limited to existing LTE. The term "LTE" used in the present specification is intended to have a broad meaning including LTE-Advanced and the subsequent modes (e.g., NR) unless otherwise specified.

In the embodiments of the present invention described below, terms such as SS (Synchronization signal), PSS (Primary SS), SSs (Secondary SS), PBCH (Physical broadcast channel), PRACH (Physical random access channel), and the like, which are used in conventional LTE, are used. For convenience of description, signals, functions, and the like similar to those described above may be referred to by other names. Further, the above terms in NR correspond to NR-SS, NR-PSS, NR-SSS, NR-PBCH, NR-PRACH, etc. However, even a signal used for NR is not necessarily expressed as "NR-".

In the embodiment of the present invention, the Duplex (Duplex) system may be a TDD (Time Division Duplex) system, an FDD (Frequency Division Duplex) system, or other (for example, a Flexible Duplex (Flexible Duplex) system).

In the embodiment of the present invention, the "set (configuration)" of the radio parameters or the like may be a specific value set in advance (Pre-configuration), or may be a radio parameter set notified from the base station 10 or the terminal.

Fig. 1 is a diagram showing an example of the structure of an O-RAN architecture. As shown in fig. 1, as a function of implementing operation management of a network, a network architecture has "organization and Automation (organization & Automation)". The "organization and Automation" is, for example, ONAP (Open Network Automation Platform), MANO (Management and Network organization) implementation, NMS (Network Management System), or the like. The "layout and automation" is constituted by functional units such as "Design (Design)", "Inventory (Inventory)", "Policy (Policy)", "Configuration (Configuration)", and "RAN Intelligent Controller (RIC) non-RT (RAN Intelligent Controller (RIC) non-RT)".

The Network managed by the "organization and automation" via the interface a1 includes functional units such as "RAN Intelligent Controller (RIC) near RT (RAN Intelligent Controller (RIC) near RT)", "Multi-RAT CU Protocol Stack (Multi-RAT CU Protocol Stack)", "NFVI (Network function virtualization infrastructure) Platform (Platform))," O-DU (O-RAN Distributed Unit) ", and" O-RU (O-RAN Radio Unit) ".

"RIC near RT" has as application layer "third party APP (3)^rdparty APP), "Wireless Connection Mgmt (radio Connection Mgmt)", "mobility Mgmt (mobility Mgmt)", "QoS Mgmt", "interference Mgmt (interference Mgmt)", and "Trained Model", etc. In addition, the "RIC near RT" has a "Radio-Network Information Base (Radio-Network Information Base)". The "RIC near RT" is connected to the CU and the DU via an interface E2.

The "multi-RAT CU protocol stack" is composed of "CU-CP (Control plane)" and "CU-UP (User plane)". The "CU-CP" has a Protocol "RRC (Radio Resource Control)" and a Protocol "PDCP (Packet Data Convergence Protocol)) -C", and the "CU-UP" has a Protocol "SDAP (Service Data Adaptation Protocol)" and a Protocol "PDCP-U". The "multi-RAT CU protocol stack" is connected with the "O-DU" via an interface F1.

The "NFVI platform" is a virtual layer and COTS (commercial off the shelf) platform.

The "O-DU" is constituted by "RLC (Radio Link Control)", "MAC (Media Access Control)", and "PHY-high". The "O-DU" is connected to the "O-RU" via an interface "Open Front Haul". The "O-RU" is composed of "PHY-low" and "RF".

Fig. 2 is a diagram showing a configuration example of the gNB 10. As shown in fig. 2, the base station gNB10 is separated into CU10C, O-DU10A, and O-RU 10B. CU10C includes RRC/SDAP and PDCP. The O-DU10A includes RLC, MAC and PHY-High. The O-RU10B includes PHY-Low & RF. Between the O-DU10A and the O-RU10B, IQ sample strings of OFDM (Orthogonal Frequency Division Multiplexing) signals in the Frequency domain are transmitted and received. The IQ sample string is a sequence of samples of the in-phase and quadrature components of the complex digital signal.

As shown in fig. 2, the PHY-High function of the O-DU10A in the processing flow of DL (Downlink) such as PDSCH (Physical Downlink Shared Channel) is "coding", "scrambling", "modulation", "layer mapping", "precoding", and "resource element mapping". The PHY-Low & RF functions of the O-RU10B in the subsequent DL processing flow are "precoding", "digital BF (Beam Forming)", "IFFT (Inverse Fast Fourier Transform)", "analog Transform", and "analog BF". In the case where precoding is performed in the O-RU10B, the O-DU10A does not perform precoding.

As shown in fig. 2, PHY-Low & RF functions of the O-RU10B in a processing flow of an UL (Uplink) such as a PUSCH (Physical Uplink Shared Channel) are "analog BF", "digital Transform", "FFT (Fast Fourier Transform)" and "digital BF". In the subsequent UL processing flow, the PHY-High function of the O-DU10A is "resource element demapping", "equivalent processing/IDFT/channel estimation", "demodulation", "descrambling", and "decoding".

Fig. 3 is a diagram for explaining signals between the O-DU10A and the O-RU 10B. As shown in fig. 3, between the O-DU10A and the O-RU10B, a U-Plane (U-Plane) signal, a C-Plane (C-Plane) signal, an M-Plane (M-Plane) signal, and an S-Plane (S-Plane) signal are transmitted and received via forwarding.

The U-plane signal is a DL signal transmitted to the radio section or an UL signal received from the radio section by the O-RU10B, and is exchanged with digital IQ samples of an OFDM signal in the frequency domain.

The C-plane signal is a signal necessary for performing various controls related to transmission and reception of the U-plane signal, and notifies information related to radio resource mapping, beam forming, and the like of the U-plane signal, for example. As shown in fig. 3, C-plane signals are transmitted in a unidirectional manner from the O-DU10A to the O-RU 10B. However, in the case of LAA (licensed-Assisted Access using LTE), a C-plane signal may also be transmitted from the O-RU10B to the O-DU 10A.

The M-plane signal is a signal necessary for managing O-DU10A and O-RU 10B. For example, various hardware capabilities of the O-RU10B are notified from the O-RU10B to the O-DU10A via an M-plane signal, and various setting values are notified from the O-DU10A to the O-RU 10B.

The S-plane signal is a signal necessary for synchronization control between the O-DU10A and the O-RU 10B.

Fig. 4 is a diagram for explaining an example of a method of determining the transmission power of the O-RU 10B. The downlink signal transmission power transmitted by the O-RU10B is determined by 1) and 2) below. The desired transmission power is achieved by setting or notifying both 1) and 2) by the O-DU 10A.

1) Magnitude of digital power scaling (DL gain) set point. As shown in fig. 4, the timing at the time of device startup or the like is set in advance from the O-DU10A to the O-RU10B via the M-plane. The set value of the DL gain is used for level adjustment of the power amplifier provided in the O-RU10B, and the like.

2) The size of the sample values of the digital IQ signal. Each time a DL signal is transmitted via the U-plane, the O-RU10B is notified from the O-DU 10A.

Fig. 5 is a timing diagram for explaining signals between the O-DU10A and the O-RU 10B. In step S1, the O-RU10B reports the settable maximum value of the DL gain to the O-DU 10A. Next, in step S2, the O-DU10A notifies the O-RU10B of the value set as the DL gain.

Here, in the power amplifier provided in the O-RU10B, generally, the range of amplification factor in which the linearity of the input/output signal is maintained is limited. Therefore, the range of the magnification ratio in which the operation can be appropriately performed is generally limited. However, in the existing O-RAN specifications, the information notified from the O-RU10B to the O-DU10A is only "the maximum value of settable amplification ratios", and the O-DU10A cannot grasp "the range of amplification ratios in which the operation can be appropriately performed". Therefore, there is a concern that: according to the value of the DL gain set by O-DU10A, linearity of the input/output signal of the power amplifier cannot be maintained, and distortion of the signal transmission or the waveform of the transmission signal at a power different from the assumed power occurs, and as a result, the terminal cannot correctly receive the downlink signal, and downlink communication cannot be correctly unblocked. Therefore, the O-DU10A must be able to grasp "the range of amplification factor in which the operation is appropriately performed".

Fig. 6 is a diagram for explaining an example (1) of setting the magnification in the embodiment of the present invention. The O-RU10B notifies the O-DU10A of information indicating a range of DL gain in which the power amplifier operates properly. Based on this information, the O-DU10A can set a DL gain in a range in which the O-RU10B operates properly. For example, in step S1 shown in fig. 5, information indicating the range of DL gain in which the power amplifier operates properly may also be notified from the O-RU10B to the O-DU 10A. In addition, information indicating whether to notify the range of DL gain may be notified from the O-RU10B to the O-DU10A, or information indicating whether to notify the range of DL gain may also be notified from the O-DU10A to the O-RU 10B.

Fig. 6 is an example of information to be notified of values indicating the upper end and the lower end of the range of DL gains that operate appropriately. As shown in fig. 6, the O-RU10B may notify the O-DU10A of the upper limit value and the lower limit value of the DL gain. The O-DU10A can set an appropriate DL gain to the O-RU10B based on the upper limit value and the lower limit value. The upper end or the upper limit may be replaced with a maximum value, and the lower end or the lower limit may be replaced with a minimum value. Information indicating whether to notify the lower limit value of the DL gain may be notified from the O-RU10B to the O-DU10, or information indicating whether to notify the lower limit value of the DL gain may be notified from the O-DU10A to the O-RU 10B.

Fig. 7 is a diagram for explaining an example (2) of setting the magnification in the embodiment of the present invention. Fig. 7 is an example of information to be notified of values indicating the upper end and the lower end of the range of DL gains that operate appropriately. As shown in fig. 7, the O-RU10B may notify the O-DU10A of the difference α with the upper limit value X and the lower limit value X- α of the DL gain as a reference. That is, the O-RU10B may notify the O-DU10A of X and α. The O-DU10A can set an appropriate DL gain to the O-RU10B based on the upper limit value and the lower limit value.

Fig. 8 is a diagram for explaining an example (3) of setting the magnification in the embodiment of the present invention. Fig. 8 is an example of being notified of information indicating a range of DL gain that operates appropriately. As shown in fig. 8, the O-RU10B may also notify the O-DU10A of the upper limit value of the DL gain and the amplitude with reference to the upper limit value. The O-DU10A can set an appropriate DL gain to the O-RU10B based on the upper limit value and the amplitude with the upper limit value as a reference.

Fig. 9 is a diagram for explaining an example (4) of setting the magnification in the embodiment of the present invention. Fig. 9 is an example of being notified of information indicating a range of DL gain in which an operation is appropriately performed. As shown in fig. 9, the O-RU10B may also notify the O-DU10A of a combination of the upper limit value and the lower limit value of the DL gain. The O-DU10A can set an appropriate DL gain to the O-RU10B based on a combination of the upper limit value and the lower limit value.

For example, the information notified from the O-RU10B to the O-DU10A may include information indicating a plurality of ranges of DL gains that operate appropriately. From this information, in the case where the O-RU10B has a plurality of ranges of DL gains that operate properly, the O-DU10A can set the proper DL gain to the O-RU 10B.

For example, the method of notifying the O-DU10A from the O-RU10B may be any of the following methods 1) to 4).

1) Notification per Array Carrier element (Array Carrier element) of O-RU10B

2) Notification per Array Carrier (Array Carrier) of O-RU10B

3) Notification per Array (Array) of O-RU10B

4) Notification per O-RU10B

The above-mentioned arrays 1) to 4) are composed of one to a plurality of array elements, and the array elements are composed of one to a plurality of elements that emit radio waves. The methods 1) to 4) above assume control of the amount of signal flowing in the preamble. 1) The signal amount is the largest, and the signal amounts are reduced in the order of 2), 3), and 4). For example, when the communication status of the forward link is a status in which the signal amount should be reduced, the method of 4) may be used as the notification method.

Fig. 10 is a diagram showing an example (1) of a data model in the embodiment of the present invention. FIG. 10 is an example of an M-Plane (M-Plane) signal using the data modeling language YANG (Yet antenna Next Generation). When the O-RU10B shown in fig. 6 notifies the O-DU10A of the upper limit value and the lower limit value of the DL gain, the M-plane signal is notified. In the example shown in fig. 10, the M-plane signal includes an upper limit value "max-gain" and a lower limit value "min-gain", which are expressed in units of decimals 64 in decibels, i.e., in a 64-bit wide 10-ary floating point format, respectively. The M-plane signal shown in fig. 10 may have an identifier or a flag indicating whether or not to notify the lower limit value of the DL gain.

Fig. 11 is a diagram showing an example (2) of a data model in the embodiment of the present invention. Fig. 11 is an example of an M-plane signal using the data modeling language YANG. When the O-RU10B shown in fig. 8 notifies the O-DU10A of the upper limit value of the DL gain and the amplitude with the upper limit value as a reference, the M-plane signal is notified. In the example shown in fig. 11, the M-plane signal includes an upper limit value "max-gain" and an amplitude "gain-range" based on the upper limit value, and each of the M-plane signal is expressed in a decimal64 in decibels, that is, in a 64-bit wide 10-ary floating point format. The M-plane signal shown in fig. 11 may have an identifier or a flag indicating whether or not to notify the range of the DL gain.

Fig. 12 is a flowchart for explaining an example of the startup process in the embodiment of the present invention. A procedure (start procedure) for establishing an M-plane connection between the O-DU10A and the O-RU10B is described in a Network Configuration Protocol (NETCONF) client/server model shown in fig. 12. The NETCONF server corresponds to O-RU 10B. The NETCONF client is a device that manages O-RUs, and the O-DU10A may correspond thereto.

As shown in fig. 12, the start-up procedure first performs initialization of the transport layer. The O-RU10B then begins synchronizing with the master reference clock. Next, the O-RU10B calls (call) the NETCONF client, establishing a Secure connection based on SSH (Secure Shell). NETCONF capability discovery may also be performed subsequently and a new administrative account provided. Then, management based on the NETCONF connection is performed, and information of the O-RU10B is retrieved. Here, while the information of the O-RU10B is retrieved, information indicating the range of the DL gain that operates properly may be notified from the O-RU10B to the O-DU10A together with the upper limit value of the DL gain, or may be notified separately from the upper limit value of the DL gain. In addition, information indicating the range of DL gain that operates properly may also be notified from the O-RU10B to the O-DU10A through a newly defined procedure.

Next, software management is performed, and CU plane connectivity confirmation between the O-DU10A and the O-RU10B, setting of the U plane, restoration of the delay profile in the O-RU10B, and delay measurement of the CU plane as options are performed. Then, fault management and performance measurement are enabled. Subsequently, the state of the O-RU10B including the synchronization information is retrieved. Then, the operation parameters of the O-RU10B are set, and the service becomes available.

According to the above-described embodiment, in O-DU10A and O-RU10B that have a structure in which a part of the gNB10 is separated, the O-RU10B notifies the O-DU10A of the range of appropriate amplification factor corresponding to the power amplifier of the present apparatus, and the O-DU10A can set the appropriate amplification factor to the O-RU 10B.

That is, in the wireless communication system, an appropriate amplification factor can be set for a wireless functional unit including a power amplifier.

(device construction)

Next, a functional configuration example of the base station 10 that performs the processing and operation described so far will be described. The base station 10 comprises functionality to implement the embodiments described above. However, the base station 10 may have only a part of the functions in the embodiment.

< base station 10>

Fig. 13 is a diagram showing an example of a functional configuration of the base station 10 according to the embodiment of the present invention. As shown in fig. 13, base station 10 includes transmission section 110, reception section 120, setting section 130, and control section 140. The functional configuration shown in fig. 13 is merely an example. The functional distinction and the name of the functional unit may be arbitrary as long as the operation according to the embodiment of the present invention can be performed. The gNB10, O-DU10A, O-RU10B, and CU10C may have a part or all of the functional units shown in fig. 13, and implement the functions described in the embodiments.

The transmitting unit 110 has a function of transmitting an inter-network-node message to other network nodes. Transmission section 110 may have a function of generating a signal to be transmitted to the terminal side and transmitting the signal wirelessly. The receiving unit 120 includes a function of receiving various signals transmitted from other network nodes or terminals and acquiring, for example, higher layer information from the received signals. In addition, the receiving unit 120 receives an inter-network node message from other network nodes. Furthermore, transmission section 110 may have a function of transmitting NR-PSS, NR-SSS, NR-PBCH, DL/UL control signals, and the like to a terminal.

The setting unit 130 has a function of storing preset setting information and various kinds of setting information transmitted to a terminal or a network node. The content of the setting information is, for example, setting information related to communication between network nodes such as between O-DU and O-RU, setting information for DL transmission or UL reception, and the like.

As described in the embodiment, the control unit 140 performs control related to communication between network nodes or communication with a terminal. The transmission unit 110 may include the functional unit related to signal transmission in the control unit 140, and the reception unit 120 may include the functional unit related to signal reception in the control unit 140.

(hardware construction)

The block diagram (fig. 13) used for the description of the above embodiment shows blocks of functional units. These functional blocks (structural units) are implemented by any combination of at least one of hardware and software. Note that the method of implementing each functional block is not particularly limited. That is, each functional block may be implemented by 1 apparatus physically or logically combined, or by directly or indirectly (for example, by using a wire or wireless) connecting 2 or more apparatuses physically or logically separated and implementing these plural apparatuses. The functional blocks may be implemented by combining software on the above-described 1 device or a plurality of devices.

The functions include judgment, determination, judgment, calculation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, establishment, comparison, assumption, expectation, view, broadcast (broadcasting), notification (notification), communication (communicating), forwarding (forwarding), configuration (configuration), reconfiguration (reconfiguration), allocation (allocation, mapping), assignment (allocation), and the like, but are not limited thereto. For example, a functional block (structural unit) serving as a transmission function may also be referred to as a transmission unit (transmitting unit) or a transmitter (transmitter). The method of implementation is not particularly limited, as in the above.

For example, the base station 10 and the like in one embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 14 is a diagram illustrating an example of a hardware configuration of the base station 10 according to the embodiment of the present disclosure. The base station 10 may be configured as a computer device physically 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, and the like. Further, the O-DU10A, the O-RU10B, the CU10C, and the like may be configured by hardware shown in fig. 14, similarly to the base station 10.

In the following description, the term "device" may be replaced with a circuit, an apparatus, a unit, or the like. The hardware configuration of the base station 10 may include one or more of the devices shown in the drawings, or may not include some of the devices.

Each function of the base station 10 is realized by causing hardware such as the processor 1001 and the storage device 1002 to read specific software (program) so that the processor 1001 performs an operation to control communication by the communication device 1004 or to control one of reading and writing of data in the storage device 1002 and the auxiliary storage device 1003.

The processor 1001 controls the entire computer by operating an operating system, for example. The processor 1001 may be configured by a Central Processing Unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, a register, and the like. For example, the control unit 140, the control unit 240, and the like described above may be implemented by the processor 1001.

The processor 1001 reads out a program (program code), a software module, data, and the like from at least one of the auxiliary storage device 1003 and the communication device 1004 to the storage device 1002, and executes various processes in accordance with the read program (program code), software module, data, and the like. As the program, a program that causes a computer to execute at least a part of the operations described in the above embodiments may be used. For example, the control unit of the base station 10 shown in fig. 13 may also be accommodated in the storage device 1002 and realized by a control program operating in the processor 1001. The above-described various processes are executed by 1 processor 1001, but may be executed simultaneously or sequentially by 2 or more processors 1001. The processor 1001 may be mounted in more than 1 chip. In addition, the program may also be transmitted from a network via a telecommunication line.

The storage device 1002 may be a computer-readable recording medium, and may be configured by at least one of a ROM (Read Only Memory), an EPROM (Erasable Programmable ROM), an EEPROM (Electrically Erasable Programmable ROM), a RAM (Random Access Memory), and the like. The storage 1002 may also be referred to as a register, cache, main memory (primary storage), or the like. The storage device 1002 can store a program (program code), a software module, and the like that are executable to implement the communication method according to one embodiment of the present disclosure.

The auxiliary storage device 1003 may be a computer-readable recording medium, and may be configured with at least one of an optical disk such as a CD-ROM (Compact Disc read only memory), a hard disk drive, a flexible disk, an 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, and a magnetic stripe (stripe). The storage medium may be, for example, a database including at least one of the storage device 1002 and the auxiliary storage device 1003, a server, or another suitable medium.

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 referred to as a network device, a network controller, a network card, a communication module, or the like. Communication apparatus 1004 may be configured to include a high-Frequency switch, a duplexer, a filter, a Frequency synthesizer, and the like, for example, in order 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 line interface, and the like can be realized by the communication device 1004. The transmitting and receiving unit may also be implemented to be physically or logically separately installed by the transmitting unit and the receiving unit.

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

Further, the processor 1001 and the storage device 1002 are connected to each other via a bus 1007 for communicating information. The bus 1007 may be formed using a single bus, or may be formed using a bus different from one device to another.

The base station 10 may be configured to include hardware such as a microprocessor, a Digital Signal Processor (DSP), an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), an FPGA (Field Programmable Gate Array), and the like, and a part or all of each functional block may be realized by the hardware. For example, the processor 1001 may also be installed using at least one of these hardware.

(summary of the embodiment)

As described above, according to an embodiment of the present invention, there is provided a communication apparatus including: a transmission unit that transmits information indicating a range of amplification factors in which an amplifier of the own apparatus can operate appropriately to another communication apparatus; a reception unit configured to receive, from the other communication device, a sampling sequence of an in-phase component and an Orthogonal component of an OFDM (Orthogonal Frequency Division Multiplexing) signal of an amplification factor and a Frequency domain set in the own device; and a control unit configured to transmit a radio signal to which an amplification factor set for the local apparatus based on the sampling sequence is applied.

With the above configuration, in O-DU10A and O-RU10B that employ a configuration in which a part of gNB10 is separated, O-RU10B notifies O-DU10A of a range of appropriate amplification factors corresponding to the power amplifier of the present apparatus, whereby O-DU10A can set the appropriate amplification factor to O-RU 10B. That is, in the wireless communication system, an appropriate amplification factor can be set for a wireless functional unit including a power amplifier.

The information indicating the range of the amplification factor may include an upper limit value of the amplification factor and a lower limit value of the amplification factor, or an upper limit value of the amplification factor and a width based on the upper limit value of the amplification factor. With this configuration, the O-RU10B can notify the O-DU10A of the range of appropriate amplification factors corresponding to the power amplifier of the present apparatus.

The information indicating the range of the magnification may include a plurality of ranges of the magnification. According to this configuration, when there are a plurality of ranges of suitable amplification factors corresponding to the power amplifier of the present apparatus, the O-RU10B can notify the O-DU10A of the plurality of ranges of amplification factors.

The transmission unit may transmit information indicating the range of the amplification factor to the other communication apparatus for each antenna of the communication apparatus or for each communication apparatus. With this structure, the O-RU10B can control the amount of signal flowing in the preamble.

Further, according to an embodiment of the present invention, there is provided a communication apparatus including: a reception unit that receives, from another communication apparatus, information indicating a range of amplification rates at which an amplifier of the other communication apparatus can operate appropriately; a control unit that determines an amplification factor to be set for the other communication device based on information indicating the range of the amplification factor; and a transmission unit configured to transmit the determined amplification factor and a sample sequence of an in-phase component and an Orthogonal component of an OFDM (Orthogonal Frequency Division Multiplexing) signal in a Frequency domain to the other communication device.

With the above configuration, in O-DU10A and O-RU10B that employ a configuration in which a part of the gNB10 is separated, the O-RU10B notifies the O-DU10A of the range of the appropriate amplification factor corresponding to the power amplifier of the present apparatus, and the O-DU10A can set the appropriate amplification factor to the O-RU 10B. That is, in the wireless communication system, an appropriate amplification factor can be set for a wireless functional unit including a power amplifier.

Further, according to an embodiment of the present invention, there is provided a communication method performed by a communication apparatus, including: a transmission process of transmitting information indicating a range of amplification factor in which an amplifier of the present apparatus can operate appropriately to the other communication apparatus; a reception step of receiving, from the other communication apparatus, a sampling sequence of an in-phase component and an Orthogonal component of an OFDM (Orthogonal Frequency Division Multiplexing) signal of an amplification factor and a Frequency domain set for the own apparatus; and a control step of transmitting a radio signal to which the amplification factor set for the local apparatus based on the sampling sequence is applied.

With the above configuration, in O-DU10A and O-RU10B that employ a configuration in which a part of the gNB10 is separated, the O-RU10B notifies the O-DU10A of a range of appropriate amplification factors corresponding to the power amplifier of the present apparatus, and thereby the O-DU10A can set the appropriate amplification factor to the O-RU 10B. That is, in the wireless communication system, an appropriate amplification factor can be set for a wireless functional unit including a power amplifier.

(supplement to embodiment)

While 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, alternatives, and substitutions. Although specific numerical examples are used to facilitate understanding of the present invention, unless otherwise specified, these numerical values are merely examples, and any appropriate values may be used. The items described in the above description are not essential in the present invention, and items described in two or more items may be combined and used as necessary, and items described in one item may be applied to items described in another item (as long as there is no contradiction). Boundaries of functional units or processing units in the functional block diagrams do not necessarily correspond to boundaries of physical components. The operations of a plurality of functional units may be physically performed by one component, or the operations of one functional unit may be physically performed by a plurality of components. The order of the processes described in the embodiments may be changed as long as there is no contradiction. For convenience of handling the description, the base station 10 is illustrated using functional block diagrams, however, such means may also be implemented by hardware, by software or by a combination thereof. Software operated by a processor carried by the base station 10 according to embodiments of the present invention may also be stored in Random Access Memory (RAM), flash memory, Read Only Memory (ROM), EPROM, EEPROM, registers, hard disk (HDD), a removable disk, a CD-ROM, a database, a server, any other suitable storage medium.

Note that the information is not limited to the embodiments and modes described in the present disclosure, and may be notified by other methods. For example, the Information may be notified by physical layer signaling (e.g., DCI (Downlink Control Information), UCI (Uplink Control Information)), higher layer signaling (e.g., RRC (Radio Resource Control)) signaling, MAC (Medium Access Control) signaling, broadcast Information (MIB (Master Information Block)), SIB (System Information Block), other signals, or a combination thereof).

The aspects/embodiments described in the present disclosure may also be applied to LTE (Long Term Evolution), LTE-a (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G (fourth generation mobile communication system), 5G (fifth 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), IEEE 802.16(WiMAX (registered trademark)), IEEE 802.20, UWB (Ultra-WideBand), Bluetooth (registered trademark), a system using other appropriate systems, and a next generation system expanded based on these. Further, a plurality of systems may be applied in combination (for example, a combination of 5G and at least one of LTE and LTE-a).

The order of processing, sequence, flow, and the like of the respective modes and embodiments described in the present specification may be changed as long as they are not contradictory. For example, elements of the various steps are presented in the order of illustration with respect to the method described in the present disclosure, and are not limited to the specific order presented.

In the present specification, it is assumed that a specific operation performed by the base station 10 is sometimes performed by an upper node (upper node) thereof depending on the case. Obviously, in a network configured by one or more network nodes (network nodes) having the base station 10, various operations performed for communication with the terminal can be performed by at least 1 of the base station 10 and other network nodes (for example, MME, S-GW, or the like may be considered, but not limited thereto) other than the base station 10. In the above, the case where one network node is exemplified other than the base station 10, however, the other network node may be a combination of a plurality of other network nodes (e.g., MME and S-GW).

Information, signals, and the like described in the present disclosure can be output from a higher layer (upper layer) (or from a lower layer (lower layer)) to a lower layer (or higher layer). Or may be input and output via a plurality of network nodes.

The information to be input and output may be stored in a specific location (for example, a memory) or may be managed using a management table. Information and the like to be input and output can be overwritten, updated, or written. The output information and the like may be deleted. The inputted information and the like may be transmitted to other devices.

The determination in the present disclosure may be performed by a value (0 or 1) expressed by 1 bit, may be performed by a true or false value (boolean value) true or false, or may be performed by a comparison of numerical values (for example, comparison with a specific value).

Software shall be construed broadly to mean instructions, instruction sets, code segments, program code, programs, subroutines, software modules, applications, software packages, routines, subroutines, objects (objects), executables, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or by other names.

In addition, software, instructions, information, and the like may also be transmitted or received via a transmission medium. For example, in the case where software is transmitted from a website, server, or other remote source using at least one of a wired technology (coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and a wireless technology (infrared, microwave, etc.), at least one of these wired and wireless technologies is included in the definition of transmission medium.

Information, signals, etc. described in this disclosure may also be represented using one of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, and the like that may be referenced throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or photons, or any combination thereof.

In addition, terms described in the present disclosure and terms necessary for understanding the present disclosure may be replaced with terms having the same or similar meanings. For example, at least one of the channel and the symbol may be a signal (signaling). Further, the signal may also be a message. Further, a Component Carrier (CC) may also be referred to as a Carrier frequency, a cell, a frequency Carrier, and the like.

The terms "system" and "network" as used in this disclosure may be used interchangeably.

In addition, information, parameters, and the like described in the present disclosure may be expressed by absolute values, relative values from specific values, or other corresponding information. For example, the radio resource may also be indicated by an index.

The names used for the above parameters are not limiting names at any point. Further, there are also cases where the mathematical expressions using these parameters and the like are different from those explicitly disclosed in the present disclosure. The various channels (e.g., PUCCH, PDCCH, etc.) and information elements can be identified by any suitable names, and thus the various names assigned to these various channels and information elements are not limitative names in any way.

In the present disclosure, terms such as "Base Station (BS)", "wireless Base Station", "Base Station apparatus", "fixed Station (fixed Station)", "NodeB", "enodeb (enb)", "gbnodeb (gnb)", "access Point", "transmission Point", "Reception Point", "transmission/Reception Point", "cell", "sector", "cell", "carrier", "component carrier" are used interchangeably. A base station is sometimes referred to by the terms macrocell, smallcell, femtocell, picocell, and the like.

A base station can accommodate one or more (e.g., three) cells. In the case where a base station accommodates a plurality of cells, the coverage area of the base station as a whole can be divided into a plurality of smaller areas, and each smaller area can also provide a communication service through a base station subsystem (e.g., an indoor small base station (RRH): Remote Radio Head) — "cell" or "sector" which is a term referring to a part or the whole of the coverage area of at least one of the base station and the base station subsystem that performs a communication service in the coverage area.

In the present disclosure, terms such as "Mobile Station (MS)", "User terminal (User terminal)", "User Equipment (UE)", and "terminal" can be used interchangeably.

A mobile station is sometimes referred to by those skilled in the art as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless communications device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset (hand set), user agent, mobile client, or several other appropriate terms.

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

In addition, the base station in the present disclosure may also be replaced with a user terminal. For example, the aspects and 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 terminals (e.g., also referred to as D2D (Device-to-Device), V2X (Vehicle-to-event), and the like). In this case, the terminal may have the function of the base station 10. Also, the languages such as "upstream" and "downstream" may be replaced with terms (e.g., "side") corresponding to inter-terminal communication. For example, the uplink channel, the downlink channel, and the like may be replaced with the side channel.

Likewise, the user terminal in the present disclosure may also be replaced with a base station. In this case, the base station may have the function of the user terminal.

The terms "determining" and "deciding" used in the present disclosure sometimes include various operations. The terms "determining" and "decision" may include, for example, determining "and" deciding "on a decision (judging), calculation (calculating), processing (processing), derivation (deriving), investigation (investigating), search (looking up), search (retrieving), inquiry (querying)) (e.g., a search in a table, database, or other data structure), confirmation (authenticating), and the like. The terms "determining" and "determining" may include determining "and" determining "as to whether reception (e.g., reception information), transmission (e.g., transmission information), input (input), output (output), access (e.g., access to data in a memory), and the like have been performed. The terms "determining" and "determining" can include determining and determining that a solution (resolving), a selection (selecting), a selection (sounding), a building (establishing), a comparison (comparing), and the like are performed. That is, "judgment" and "determination" may include "judgment" and "determination" regarding an arbitrary operation. The "determination (decision)" may be replaced with "assumption", "desire", "treating", and the like.

The terms "connected", "coupled" or all variations thereof mean that all connections or couplings, direct or indirect, between 2 or more elements, and can include 1 or more intermediate elements between two elements that are "connected" or "coupled" to each other. The combination or connection between the elements may be physical, logical, or a combination thereof. For example, "connected" may also be replaced with "accessed". As used in this disclosure, the 2 elements can be considered to be "connected" or "joined" to each other using at least one of one or more wires, cables, and printed electrical connections, and as a few non-limiting and non-exhaustive examples, to be "connected" or "joined" to each other using electromagnetic energy or the like having wavelengths in the wireless frequency domain, the microwave region, and the optical (both visible and invisible) region.

The Reference Signal can also be referred to simply as RS (Reference Signal) and, depending on the standard of application, may also be referred to as Pilot (Pilot) or the like.

The term "based on" used in the present disclosure does not mean "based only on" unless otherwise noted. In other words, the expression "based on" means both "based only on" and "based at least on".

Any reference to an element using the designations "first," "second," etc. used in this disclosure is not intended to limit the amount or order of such elements as a whole. These designations can be used in the present disclosure as a convenient method of distinguishing between two or more elements. Thus, reference to first and second elements does not mean that only two elements can be employed, or that in some form the first element must precede the second element.

The "components" in the configuration of each device described above may be replaced with "units", "circuits", "devices", and the like.

In the present disclosure, when the terms "including", and variations thereof are used, these terms mean an inclusive meaning as with the term "comprising". Further, the term "or" as used in this disclosure is not meant to refer to a logical exclusive or.

In the present disclosure, in the case where articles such as "a", "an", and "the" in english are added by translation, a case where nouns after these articles are plural forms can also be included in the present disclosure.

In the present disclosure, the term "a and B are different" may also mean "a and B are different from each other". In addition, the term also means "a and B are different from C, respectively". The terms "separate", "combine", and the like are also to be construed as similar to "different".

The aspects and embodiments described in the present disclosure may be used alone, may be used in combination, or may be switched to use with execution. Note that the notification of the specific information (for example, the notification of "X") is not limited to be explicitly performed, and may be performed implicitly (for example, the notification of the specific information is not performed).

While the present disclosure has been described in detail, it will be apparent to those skilled in the art that the present disclosure is not limited to the embodiments described in the present disclosure. The present disclosure can be implemented as modifications and variations without departing from the spirit and scope of the present disclosure determined based on the description of the claims. Accordingly, the description of the present disclosure is for the purpose of illustration and is not intended to be in any way limiting.

10 base station

10A O-DU

10B O-RU

10C CU

110 sending unit

120 receiving unit

130 setting unit

140 control unit

1001 processor

1002 storage device

1003 auxiliary storage device

1004 communication device

1005 input device

1006 output device

Claims (6)

1. A communication apparatus has:

a transmission unit that transmits information indicating a range of amplification factors in which an amplifier of the own apparatus can operate appropriately to another communication apparatus;

a reception unit configured to receive, from the other communication apparatus, a sampling sequence of an in-phase component and an orthogonal component of an OFDM (orthogonal frequency division multiplexing) signal of an amplification factor and a frequency domain set in the own apparatus; and

and a control unit that transmits a radio signal to which the amplification factor set for the own device based on the sampling sequence is applied.

2. The communication device of claim 1,

the information indicating the range of the amplification factor includes an upper limit value of the amplification factor and a lower limit value of the amplification factor, or an upper limit value of the amplification factor and a width based on the upper limit value of the amplification factor.

3. The communication device of claim 1,

the information indicating the range of the magnification includes a plurality of ranges of the magnification.

4. The communication device of claim 1,

the transmission unit transmits information indicating the range of the amplification factor for each antenna of the communication device or each communication device to the other communication device.

5. A communication apparatus has:

a reception unit that receives, from another communication apparatus, information indicating a range of amplification rates at which an amplifier of the other communication apparatus can operate appropriately;

a control unit that determines an amplification factor to be set for the other communication device based on information indicating the range of the amplification factor; and

and a transmission unit configured to transmit the determined amplification factor and the sample sequence of the in-phase component and the orthogonal component of the frequency domain OFDM (orthogonal frequency division multiplexing) signal to the other communication apparatus.

6. A communication method performed by a communication device:

a transmission process of transmitting information indicating a range of amplification factor in which an amplifier of the present apparatus can operate appropriately to the other communication apparatus;

a reception step of receiving, from the other communication apparatus, a sampling sequence of an in-phase component and an orthogonal component of an OFDM (orthogonal frequency division multiplexing) signal of an amplification factor and a frequency domain set for the own apparatus; and

and a control step of transmitting a radio signal to which the amplification factor set for the local apparatus based on the sampling sequence is applied.

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