KR20240110459A - Electronic device and method for controlling radio unit for power saving - Google Patents

Abstract

According to one embodiment, an electronic device of a radio unit (RU) may include at least one transceiver and at least one processor coupled to the at least one transceiver. The at least one processor may receive a configuration request message for configuring a low-power mode for deactivating at least one component of the RU from a distributed unit (DU) through the at least one transceiver. The setup request message may include period information indicating the transmission period of the test request message and counter information indicating the maximum number of transmissions of the test request message. After receiving the configuration request message, the at least one processor may control to deactivate the at least one component of the RU. The at least one processor may transmit the inspection request message to the DU to identify transition to normal mode based on the period information. The at least one processor activates the at least one component of the RU based on whether the number of transmissions of the test request message exceeds the maximum number of transmissions or a test response message indicating a normal mode is received. You can control it to do so.

Description

Electronic device and method for controlling a radio unit to save power {ELECTRONIC DEVICE AND METHOD FOR CONTROLLING RADIO UNIT FOR POWER SAVING}

Embodiments of the present disclosure relate to an electronic device and method for controlling a radio unit (RU) to save power.

In wireless communication systems, as transmission capacity increases, function split, which functionally separates base stations, is being applied. Depending on the separation of functions, the base station can be divided into a distributed unit (DU) and a radio unit (RU). A mobile communication system can reduce power consumption by disabling some RUs (radio units) when traffic usage is low.

The above information may be provided as background art for the purpose of aiding understanding of the present disclosure. No claim or determination is made as to whether any of the foregoing can be applied as prior art to the present disclosure.

According to one embodiment, an electronic device of a radio unit (RU) may include at least one transceiver and at least one processor coupled to the at least one transceiver. The at least one processor may receive a configuration request message for configuring a low-power mode for deactivating at least one component of the RU from a distributed unit (DU) through the at least one transceiver. The setup request message may include period information indicating the transmission period of the test request message and counter information indicating the maximum number of transmissions of the test request message. After receiving the configuration request message, the at least one processor may control to deactivate the at least one component of the RU. The at least one processor may transmit the inspection request message to the DU to identify transition to normal mode based on the period information. The at least one processor activates the at least one component of the RU based on whether the number of transmissions of the test request message exceeds the maximum number of transmissions or a test response message indicating a normal mode is received. You can control it to do so.

According to one embodiment, an electronic device of a distributed unit (DU) may include at least one transceiver and at least one processor coupled to the at least one transceiver. The at least one processor may transmit a configuration request message to a radio unit (RU) to set a low-power mode that disables at least one component of the RU. The setup request message may include period information indicating the transmission period of the test request message and counter information indicating the maximum number of transmissions of the test request message. The at least one processor may receive the check request message for identifying transition to normal mode from the RU. The at least one processor may transmit, in response to the test request message, a test response message indicating the low power mode or the normal mode to the RU.

According to one embodiment, a method performed by a radio unit (RU) includes sending a configuration request message for configuring a low-power mode that disables at least one component of the RU to the at least one transceiver from a distributed unit (DU). It may include the operation of receiving through. The setup request message may include period information indicating the transmission period of the test request message and counter information indicating the maximum number of transmissions of the test request message. The method may include controlling to deactivate the at least one component of the RU after receiving the configuration request message. The method may include transmitting the test request message to the DU to identify transition to normal mode based on the period information. The method includes controlling to activate the at least one component of the RU based on whether the number of transmissions of the test request message exceeds the maximum number of transmissions or a test response message indicating a normal mode is received. may include.

According to one embodiment, a method performed by a distributed unit (DU) includes transmitting a configuration request message to a radio unit (RU) to set a low power mode that deactivates at least one component of the RU. can do. The setup request message may include period information indicating the transmission period of the test request message and counter information indicating the maximum number of transmissions of the test request message. The method may include receiving the check request message from the RU to identify transition to normal mode. The method may include an operation of transmitting, in response to the test request message, a test response message indicating the low power mode or the normal mode to the RU.

1 shows a wireless communication system, according to embodiments.
2 shows a fronthaul interface, according to embodiments.
FIG. 3A shows the functional configuration of a distributed unit (DU), according to embodiments.
FIG. 3B shows the functional configuration of a radio unit (RU) according to embodiments.
Figure 4 shows an example of function split between DU and RU, according to embodiments.
FIG. 5 illustrates an example of settings for deactivating some components of a radio unit (RU), according to embodiments.
FIG. 6 illustrates the functional configuration of a radio unit (RU) activated in a low-power mode, according to embodiments.
FIG. 7A shows an example of signaling between a distributed unit (DU) and a radio unit (RU) for switching to a normal mode based on counter information, according to embodiments.
FIG. 7B shows an example of signaling between a distributed unit (DU) and a radio unit (RU) for switching to a normal mode based on a check response message, according to embodiments.
FIG. 8 shows an example of a flow of operations of a distributed unit (DU) for reducing power consumption of a base station, according to embodiments.
FIG. 9 shows an example of a flow of operations of a radio unit (RU) for reducing power consumption of a base station, according to embodiments.

Terms used in the present disclosure are merely used to describe specific embodiments and may not be intended to limit the scope of other embodiments. Singular expressions may include plural expressions, unless the context clearly dictates otherwise. Terms used herein, including technical or scientific terms, may have the same meaning as commonly understood by a person of ordinary skill in the technical field described in this disclosure. Among the terms used in this disclosure, terms defined in general dictionaries may be interpreted to have the same or similar meaning as the meaning they have in the context of related technology, and unless clearly defined in this disclosure, have an ideal or excessively formal meaning. It is not interpreted as In some cases, even terms defined in the present disclosure cannot be interpreted to exclude embodiments of the present disclosure.

In various embodiments of the present disclosure described below, a hardware approach method is explained as an example. However, since various embodiments of the present disclosure include technology using both hardware and software, the various embodiments of the present disclosure do not exclude software-based approaches.

Terms referring to signals used in the following description (e.g., signal, information, message, signaling), and terms referring to an OAM processor (operation, administration, and maintenance processor) (e.g., OAM processor, OA&M (operation, administration and maintenance processor) ), OAM&P (operation, administration, maintenance and processor), O&M (operation and maintenance processor), OM (operation, maintenance processor), OAMP (operation, administration, maintenance processor), OAMPT (operation, administration, maintenance, troubleshooting processor) , DU control processor), terms referring to resources (e.g. symbol, slot, subframe, radio frame, subcarrier, RE ( resource element, resource block (RB), bandwidth part (BWP), opportunity), terms for operational states (e.g. step, operation, procedure), data. Terms (e.g. packet, user stream, information, bit, symbol, codeword), terms referring to channels, terms referring to network entities, low power mode Terms referring to low-power mode (low-power mode, power saving mode, sleep mode, idle mode, adaptive mode, optimization mode) , terms referring to normal mode (normal mode, connected mode, awake mode), terms referring to device components, etc. are exemplified for convenience of explanation. Accordingly, the present disclosure is not limited to the terms described below, and other terms having equivalent technical meaning may be used.

Terms used in the following description to refer to parts of electronic devices (e.g., substrate, print circuit board (PCB), flexible PCB (FPCB), module, antenna, antenna element, circuit, processor, chip, component, device); Terms that refer to the shape of a part (e.g., structure, structure, support, contact, protrusion), terms that refer to the connections between structures (e.g., connection, contact, support, contact structure, conductive member, assembly), Terms referring to circuitry (e.g. PCB, FPCB, signal line, feeding line, data line, RF signal line, antenna line, RF path, RF module, RF circuit, splitter, divider ( Divider, coupler, combiner, etc. are shown as examples for convenience of explanation. Accordingly, the present disclosure is not limited to the terms described below, and other terms having equivalent technical meaning may be used. In addition, terms such as '... part', '... base', '... water', and '... body' used hereinafter mean at least one shape structure or a unit that processes a function. It can mean.

In addition, in the present disclosure, the expressions greater than or less than may be used to determine whether a specific condition is satisfied or fulfilled, but this is only a description for expressing an example, and the description of more or less may be used. It's not exclusion. Conditions written as ‘more than’ can be replaced with ‘more than’, conditions written as ‘less than’ can be replaced with ‘less than’, and conditions written as ‘more than and less than’ can be replaced with ‘greater than and less than’. In addition, hereinafter, 'A' to 'B' means at least one of the elements from A to (including A) and B (including B). Hereinafter, ‘C’ and/or ‘D’ means including at least one of ‘C’ or ‘D’, i.e. {‘C’, ‘D’, ‘C’ and ‘D’}.

The present disclosure describes various embodiments using terms used in some communication standards (e.g., 3rd Generation Partnership Project (3GPP), extensible radio access network (xRAN), and open-radio access network (O-RAN)), This is only an example for explanation, and various embodiments of the present disclosure can be easily modified and applied to other communication systems.

Hereinafter, various embodiments disclosed in this document will be described with reference to the attached drawings. For convenience of explanation, the sizes of components shown in the drawings may be exaggerated or reduced, and the present invention is not necessarily limited to what is shown.

1 shows a wireless communication system, according to embodiments.

Referring to FIG. 1, FIG. 1 illustrates a base station 110 and a terminal 120 as some of the nodes that use a wireless channel in a wireless communication system. Although FIG. 1 shows only one base station, the wireless communication system may further include other base stations that are the same or similar to base station 110.

According to one embodiment, the base station 110 is a network infrastructure that provides wireless access to the terminal 120. The base station 110 has coverage defined based on the distance at which signals can be transmitted. In addition to the base station, the base station 110 includes 'access point (AP)', 'eNodeB (eNB)', '5G node (5th generation node)', and 'next generation nodeB'. , gNB)', 'wireless point', 'transmission/reception point (TRP)', or other terms with equivalent technical meaning.

According to one embodiment, the terminal 120 is a device used by a user and communicates with the base station 110 through a wireless channel. The link from the base station 110 to the terminal 120 is called downlink (DL), and the link from the terminal 120 to the base station 110 is called uplink (UL). Additionally, although not shown in FIG. 1, the terminal 120 and another terminal may communicate with each other through a wireless channel. At this time, the link between the terminal 120 and other terminals (device-to-device link, D2D) is referred to as a sidelink, and the sidelink may be used interchangeably with the PC5 interface. In some other embodiments, terminal 120 may operate without user involvement. According to one embodiment, the terminal 120 is a device that performs machine type communication (MTC) and may not be carried by the user. Additionally, according to one embodiment, the terminal 120 may be a narrowband (NB)-internet of things (IoT) device.

According to one embodiment, the terminal 120 includes 'user equipment (UE)', 'customer premises equipment (CPE)', 'mobile station', and 'subscription' in addition to the terminal. ‘subscriber station’, ‘remote terminal’, ‘wireless terminal’, electronic device’, or ‘user device’, or any other device with the equivalent technical meaning. It may be referred to as a term.

According to one embodiment, the base station 110 may perform beamforming with the terminal 120. The base station 110 and the terminal 120 may transmit and receive wireless signals in a relatively low frequency band (e.g., FR 1 (frequency range 1) of NR). In addition, the base station 110 and the terminal 120 use relatively high frequency bands (e.g., FR 2 (or, FR 2-1, FR 2-2, FR 2-3), FR 3 in NR), millimeter waves ( It is possible to transmit and receive wireless signals in mmWave bands (e.g., 28 GHz, 30 GHz, 38 GHz, 60 GHz). To improve channel gain, the base station 110 and the terminal 120 may perform beamforming. Here, beamforming may include transmission beamforming and reception beamforming. The base station 110 and the terminal 120 can provide directionality to a transmitted signal or a received signal. To this end, the base station 110 and the terminal 120 can select serving beams through a beam search or beam management procedure. After serving beams are selected, subsequent communication can be performed through a resource in a QCL relationship with the resource that transmitted the serving beams.

According to one embodiment, if large-scale characteristics of the channel carrying the symbols on the first antenna port can be inferred from the channel carrying the symbols on the second antenna port, then the first antenna port and the second antenna A port can be evaluated as being in a QCL relationship. For example, a wide range of characteristics include delay spread, doppler spread, doppler shift, average gain, average delay, and spatial receiver parameters. It may include at least one of:

In FIG. 1, both the base station 110 and the terminal 120 are depicted as performing beamforming, but embodiments of the present disclosure are not necessarily limited thereto. In some embodiments, the terminal may or may not perform beamforming. Additionally, the base station may or may not perform beamforming. That is, only one of the base station and the terminal may perform beamforming, or neither the base station nor the terminal may perform beamforming.

In the present disclosure, a beam refers to the spatial flow of a signal in a wireless channel, and is formed by one or more antennas (or antenna elements), and this formation process may be referred to as beamforming. there is. Beamforming may include at least one of analog beamforming or digital beamforming (eg, precoding). Reference signals transmitted based on beamforming include, for example, demodulation-reference signal (DM-RS), channel state information-reference signal (CSI-RS), and synchronization signal/physical broadcast channel (SS/PBCH). , may include a sounding reference signal (SRS). Additionally, as a configuration for each reference signal, IE such as CSI-RS resource or SRS-resource may be used, and this configuration may include information associated with the beam. Information associated with a beam refers to whether its configuration (e.g., CSI-RS resource) uses the same spatial domain filter as another configuration (e.g., another CSI-RS resource within the same CSI-RS resource set) or a different This may mean whether a spatial domain filter is used, or which reference signal it is QCL (quasi-co-located) with, and if so, what type (e.g., QCL type A, B, C, D).

Conventionally, in a communication system in which the cell radius of the base station is relatively large, each base station has a digital processing unit (or distributed unit (DU)) and a radio frequency (RF) processing unit (RF processing unit, or RU). It was installed to include the functions of a radio unit). However, as higher frequency bands are used in ^4th generation (4G) and/or subsequent communication systems (e.g., 5G) and cell coverage of base stations becomes smaller, the number of base stations to cover a specific area has increased. The installation cost burden on operators to install base stations has also increased. To minimize the installation cost of the base station, the DU and RU of the base station are separated, one or more RUs are connected to one DU through a wired network, and one or more RUs are deployed geographically distributed to cover a specific area. A structure has been proposed. Hereinafter, the deployment structure and expansion examples of the base station according to various embodiments of the present disclosure are described through FIG. 2.

2 shows a fronthaul interface, according to embodiments. Fronthaul refers to the connection between entities between a wireless network and a base station, unlike backhaul between a base station and the core network. FIG. 2 shows an example of a fronthaul structure between a DU 210 and one RU 220, but this is only for convenience of explanation and the present disclosure is not limited thereto. In other words, the embodiment of the present disclosure can also be applied to the fronthaul structure between one DU and multiple RUs. For example, embodiments of the present disclosure can be applied to a fronthaul structure between one DU and two RUs. Additionally, embodiments of the present disclosure can also be applied to a fronthaul structure between one DU and three RUs.

Referring to FIG. 2, the base station 110 may include a DU 210 and a RU 220. The fronthaul 215 between the DU 210 and the RU 220 may be operated through the F _x interface. For operation of the fronthaul 215, for example, an interface such as common public radio interface (CPRI), enhanced common public radio interface (eCPRI), or radio over ethernet (ROE) may be used.

As communication technology develops, mobile data traffic increases, and accordingly, the bandwidth requirement for the fronthaul between digital units and wireless units has increased significantly. In a deployment such as a centralized/cloud radio access network (C-RAN), the DU 210 provides functions for packet data convergence protocol (PDCP), radio link control (RLC), media access control (MAC), and physical (PHY). The RU 220 may be implemented to perform further functions for the PHY layer in addition to the radio frequency (RF) function.

According to one embodiment, DU 210 may be responsible for upper layer functions of a wireless network. For example, the DU 210 may perform the functions of the MAC layer and part of the PHY layer. Here, part of the PHY layer is performed at a higher level among the functions of the PHY layer, for example, channel encoding (or channel decoding), scrambling (or descrambling), modulation (or demodulation), and layer mapping (layer mapping) (or layer demapping). According to one embodiment, if the DU 210 complies with the O-RAN standard, it may be referred to as an O-RAN DU (O-DU). DU 210 may be represented as a replacement for a first network entity for a base station (eg, gNB) in embodiments of the present disclosure, if necessary.

According to one embodiment, the RU 220 may be responsible for lower layer functions of a wireless network. For example, the RU 220 may perform part of the PHY layer and RF functions. Here, the part of the PHY layer is one that is performed at a relatively lower level than the DU 210 among the functions of the PHY layer, for example, iFFT conversion (or FFT conversion), CP insertion (CP removal), and digital beamforming. It can be included. An example of this specific functional separation is detailed in Figure 4. RU 220 is an 'access unit (AU)', 'access point (AP)', 'transmission/reception point (TRP)', 'remote radio head (RRH) )', 'radio unit (RU)', or other terms with equivalent technical meaning. According to one embodiment, if the RU 220 complies with the O-RAN standard, it may be referred to as an O-RAN RU (O-RU). The RU 220 may be replaced with a second network entity for a base station (eg, gNB) in embodiments of the present disclosure, if necessary.

2 illustrates that the base station 110 includes a DU 210 and a RU 220, but embodiments of the present disclosure are not limited thereto. The base station according to embodiments includes a centralized unit (CU) configured to perform the functions of the upper layers of the access network (e.g., packet data convergence protocol (PDCP), radio resource control (RRC)) and a lower layer. It can be implemented as a distributed deployment according to distributed units (DUs) configured to perform functions. For example, between the core (e.g., 5GC (5G core) or NGC (next generation core)) and the wireless network, the base station may be implemented in a structure in which CU, DU, and RU are arranged in the order. To explain the relationship between DU and RU, the expression DU (digital unit) may be used, but in the present disclosure, the description of the DU (digital unit) may be understood as the description of the DU (distributed unit). The interface between the CU and distributed unit (DU) may be referred to as the F1 interface.

The centralized unit (CU) is connected to one or more DUs and may be responsible for functions of a higher layer than the DU. For example, the CU may be responsible for the functions of the radio resource control (RRC) and packet data convergence protocol (PDCP) layers, and the DU and RU may be responsible for the functions of the lower layer. DU performs RLC (radio link control), MAC (media access control), and some functions of the PHY (physical) layer (high PHY), and RU is responsible for the remaining functions of the PHY layer (low PHY). there is. Additionally, as an example, a digital unit (DU) may be included in a distributed unit (DU), depending on the distributed deployment implementation of the base station. Hereinafter, unless otherwise defined, the operations of a distributed unit (DU) and RU are described, but embodiments of the present disclosure are based on a base station arrangement including a CU or an arrangement where the DU is directly connected to the core network (i.e., the CU and It can be applied to all (where DU is integrated and implemented as a single entity, a base station (e.g., NG-RAN node)).

FIG. 3A shows the functional configuration of a distributed unit (DU) according to embodiments. The configuration illustrated in FIG. 3A may be understood as the configuration of DU 210 of FIG. 2 as part of a base station. Terms such as '... unit' and '... unit' used hereinafter refer to a unit that processes at least one function or operation, which can be implemented through hardware, software, or a combination of hardware and software. there is.

Referring to FIG. 3A, the DU 210 includes a transceiver 310, a memory 320, and a processor 330.

According to one embodiment, the transceiver 310 may perform functions for transmitting and receiving signals in a wired communication environment. The transceiver 310 may include a wired interface for controlling direct connection between devices through a transmission medium (eg, copper wire, optical fiber). For example, the transceiver 310 may transmit an electrical signal to another device through a copper wire or perform conversion between an electrical signal and an optical signal. The DU 210 may communicate with a radio unit (RU) through the transceiver 310. The DU 210 may be connected to a CU in a core network or distributed arrangement through the transceiver 310.

According to one embodiment, the transceiver 310 may perform functions for transmitting and receiving signals in a wireless communication environment. For example, the transceiver 310 may perform a conversion function between a baseband signal and a bit stream according to the physical layer standard of the system. For example, when transmitting data, the transceiver 310 generates complex symbols by encoding and modulating the transmission bit stream. Additionally, when receiving data, the transceiver 310 restores the received bit stream by demodulating and decoding the baseband signal. Additionally, the transceiver 310 may include multiple transmission and reception paths. Additionally, according to one embodiment, the transceiver 310 may be connected to a core network or other nodes (eg, integrated access backhaul (IAB)).

According to one embodiment, the transceiver 310 can transmit and receive signals. The transceiver 310 may transmit a signal to or receive a signal from another network entity (eg, RU 220). For example, the transceiver 310 may transmit a management plane (M-plane) message. For example, the transceiver 310 may transmit a synchronization plane (management plane, S-plane) message. For example, the transceiver 310 may transmit or receive a control plane (C-plane) message. For example, the transceiver 310 may transmit or receive a user plane (U-plane) message. Although only the transceiver 310 is shown in FIG. 3A, according to another implementation example, the DU 210 may include two or more transceivers.

According to one embodiment, the transceiver 310 transmits and receives signals as described above. Accordingly, all or part of the transceiver 310 may be referred to as a 'communication unit', a 'transmission unit', a 'reception unit', or a 'transmission/reception unit'. Additionally, in the following description, transmission and reception performed through a wireless channel are used to mean that processing as described above is performed by the transceiver 310.

Although not shown in FIG. 3A, the transceiver 310 may further include a backhaul transceiver for connection to the core network or another base station. The backhaul transceiver provides an interface to communicate with other nodes in the network. In other words, the backhaul transceiver converts the bit string transmitted from the base station to other nodes (e.g., other access nodes, other base stations, upper nodes, core networks, etc.) into physical signals, and the physical signals received from other nodes into bit strings. Convert.

According to one embodiment, the memory 320 stores data such as basic programs, application programs, and setting information for operation of the DU 210. Memory 320 may be referred to as a storage unit. The memory 320 may be comprised of volatile memory, non-volatile memory, or a combination of volatile memory and non-volatile memory. And, the memory 320 provides stored data according to the request of the processor 330.

According to one embodiment, the processor 330 controls the overall operations of the DU 210. The processor 380 may be referred to as a control unit. For example, the processor 330 transmits and receives signals through the transceiver 310 (or through the backhaul communication unit). Additionally, the processor 330 writes and reads data into the memory 320. Additionally, the processor 330 can perform protocol stack functions required by communication standards. Although only the processor 330 is shown in FIG. 3A, according to another implementation example, the DU 210 may include two or more processors.

The configuration of the DU 210 shown in FIG. 3A is only an example, and the example of the DU performing the embodiments of the present disclosure is not limited to the configuration shown in FIG. 3A. In some embodiments, some configurations may be added, deleted, or changed.

FIG. 3B shows the functional configuration of a radio unit (RU) according to embodiments. The configuration illustrated in FIG. 3B may be understood as the configuration of RU 220 of FIG. 2 as part of a base station. Terms such as '... unit' and '... unit' used hereinafter refer to a unit that processes at least one function or operation, which can be implemented through hardware, software, or a combination of hardware and software. there is.

Referring to FIG. 3B, the RU 220 includes an RF transceiver 360, a fronthaul transceiver 365, a memory 370, and a processor 380.

According to one embodiment, the RF transceiver 360 performs functions for transmitting and receiving signals through a wireless channel. For example, the RF transceiver 360 upconverts the baseband signal into an RF band signal and transmits it through an antenna, and downconverts the RF band signal received through the antenna into a baseband signal. For example, the RF transceiver 360 includes a transmission filter, a reception filter, a power amplifier, a mixer, an oscillator, a digital-to-analog converter (DAC), and an analog-to-digital converter (ADC). ), etc. may be included.

According to one embodiment, the RF transceiver 360 may include multiple transmission and reception paths. Furthermore, the RF transceiver 360 may include an antenna unit. The RF transceiver 360 may include at least one antenna array comprised of multiple antenna elements. In terms of hardware, the RF transceiver 360 may be composed of digital circuits and analog circuits (eg, radio frequency integrated circuit (RFIC)). Here, the digital circuit and analog circuit can be implemented in one package. Additionally, the RF transceiver 360 may include multiple RF chains. The RF transceiver 360 may perform beamforming. The RF transceiver 360 may apply a beamforming weight to the signal to be transmitted and received in order to give directionality according to the settings of the processor 380. According to one embodiment, the RF transceiver 360 may include a radio frequency (RF) block (or RF unit).

According to one embodiment, the RF transceiver 360 may transmit and receive signals on a radio access network. For example, the RF transceiver 360 may transmit a downlink signal. Downlink signals include synchronization signal (SS), reference signal (RS) (e.g., cell-specific reference signal (CRS), demodulation (DM)-RS), system information (e.g., MIB, SIB, It may include remaining system information (RMSI), other system information (OSI), configuration message, control information, or downlink data. Additionally, for example, the RF transceiver 360 may receive an uplink signal. Uplink signals include random access-related signals (e.g., random access preamble (RAP) (or Msg1 (message 1)), Msg3 (message 3)), reference signals (e.g., sounding reference signal (SRS), DM) -RS), or power headroom report (PHR), etc. Although only the RF transceiver 360 is shown in FIG. 3B, according to another implementation example, the RU 220 may include two or more RF transceivers.

According to one embodiment, the fronthaul transceiver 365 can transmit and receive signals. The fronthaul transceiver 365 may transmit a signal to or receive a signal from another network entity (e.g., DU 210). The fronthaul transceiver 365 can transmit and receive signals on the fronthaul interface. For example, the fronthaul transceiver 365 may receive a management plane (M-plane) message. For example, the fronthaul transceiver 365 may receive a synchronization plane (management plane, S-plane) message. For example, the fronthaul transceiver 365 may transmit or receive a control plane (C-plane) message. For example, the fronthaul transceiver 365 may transmit or receive a user plane (U-plane) message. Although only the fronthaul transceiver 365 is shown in FIG. 3b, according to another implementation example, the RU 220 may include two or more fronthaul transceivers.

According to one embodiment, the RF transceiver 360 and the fronthaul transceiver 365 transmit and receive signals as described above. Accordingly, all or part of the RF transceiver 360 and the fronthaul transceiver 365 may be referred to as a 'communication unit', a 'transmission unit', a 'reception unit', or a 'transceiver unit'. Additionally, in the following description, transmission and reception performed through a wireless channel are used to mean that the processing as described above is performed by the RF transceiver 360. In the following description, transmission and reception performed through a wireless channel are used to mean that the processing as described above is performed by the RF transceiver 360.

According to one embodiment, the memory 370 stores data such as basic programs, application programs, and setting information for operation of the RU 220. Memory 370 may be referred to as a storage unit. The memory 370 may be comprised of volatile memory, non-volatile memory, or a combination of volatile memory and non-volatile memory. And, the memory 370 provides stored data according to the request of the processor 380. According to one embodiment, memory 370 may include memory for conditions, commands, or setting values related to the SRS transmission method.

According to one embodiment, the processor 380 controls the overall operations of the RU 220. The processor 380 may be referred to as a control unit. For example, processor 380 transmits and receives signals through RF transceiver 360 or fronthaul transceiver 365. Additionally, the processor 380 writes and reads data into the memory 370. Additionally, the processor 380 can perform protocol stack functions required by communication standards. Although only the processor 380 is shown in FIG. 3B, according to another implementation example, the RU 220 may include two or more processors. The processor 380 is a set of instructions or code stored in the memory 370, which is a storage space that stores instructions/code or instructions/code that are at least temporarily residing in the processor 380, or the processor 380 It may be part of the circuitry that constitutes. Additionally, the processor 380 may include various modules for performing communication. The processor 380 may control the RU 220 to perform operations according to embodiments described later.

The configuration of the RU 220 shown in FIG. 3B is only an example, and the example of the RU that performs the embodiments of the present disclosure is not limited to the configuration shown in FIG. 3B. In some embodiments, some configurations may be added, deleted, or changed.

Figure 4 shows an example of function split between DU and RU, according to embodiments. As wireless communication technology develops (e.g., the introduction of the ^5th generation (5G) communication system (or the introduction of the new radio (NR) communication system), the frequency band used has further increased. As the cell radius of the base station becomes very small, The number of RUs required to be installed has further increased, and in the 5G communication system, the amount of data transmitted has increased significantly by more than 10 times, and the transmission capacity of the wired network transmitted through the fronthaul has increased significantly. Therefore, in the 5G communication system, the installation cost of the wired network can increase significantly. Therefore, in order to lower the transmission capacity of the wired network and reduce the installation cost of the wired network, some functions of the DU's modem are installed. 'Function split', which lowers the fronthaul transmission capacity by transferring it to the RU, can be used.

To reduce the burden on the DU, the role of the RU, which is responsible only for existing RF functions, can be expanded to include some functions of the physical layer. As the RU performs higher layer functions, the throughput of the RU increases, thereby increasing the transmission bandwidth in the fronthaul, and at the same time, the latency requirement constraints due to response processing can be lowered. Meanwhile, as the RU performs higher layer functions, the virtualization gain decreases, and the size, weight, and cost of the RU increase. Considering the trade-off of the advantages and disadvantages described above, it is necessary to implement optimal functional separation.

Referring to Figure 4, functional separations at the physical layer below the MAC layer are shown. In the case of downlink (DL), which transmits signals to the terminal through a wireless network, the base station sequentially performs channel encoding/scrambling, modulation, layer mapping, antenna mapping, RE mapping, digital beamforming (e.g. precoding), iFFT conversion/CP insertion, and RF conversion can be performed. In the case of uplink (UL), which receives signals from a terminal through a wireless network, the base station sequentially performs RF conversion, FFT conversion/CP removal, digital beamforming (pre-combining), and RE decoding. It can perform mapping, channel estimation, layer demapping, demodulation, and decoding/descrambling. Separation of uplink functions and downlink functions can be defined in various types depending on the need between vendors (vendors), discussions on specifications, etc. according to the trade-off described above.

According to one embodiment, in the first functional separation 405, the RU performs the RF function and the DU performs the PHY function. The first function separation is that the PHY function in the RU is not substantially implemented, and may be referred to as Option 8, for example. In the second functional separation 410, the RU performs iFFT conversion/CP insertion in the DL and FFT conversion/CP removal in the UL of the PHY functions, and the DU performs the remaining PHY functions. As an example, the second functional separation 410 may be referred to as Option 7-1. In the third function separation 420a, the RU performs iFFT conversion/CP insertion in the DL and FFT conversion/CP removal and digital beamforming in the UL of the PHY functions, and the DU performs the remaining PHY functions. As an example, the third functional separation 420a may be referred to as Option 7-2x Category A. In the fourth function separation 420b, the RU performs digital beamforming in both DL and UL, and the DU performs higher PHY functions after digital beamforming. As an example, the fourth functional separation 420b may be referred to as Option 7-2x Category B. In the fifth function separation 425, the RU performs RE mapping (or RE demapping) in both DL and UL, and the DU performs higher PHY functions after RE mapping (or RE demapping). As an example, the fifth function separation 425 may be referred to as Option 7-2. In the sixth function separation 430, the RU performs modulation (or demodulation) in both DL and UL, and the DU performs subsequent higher PHY functions until modulation (or demodulation). As an example, the sixth function separation 430 may be referred to as Option 7-3. In the seventh function separation 440, the RU performs encoding/scrambling (or decoding/descrambling) in both DL and UL, and the DU performs subsequent higher PHY functions up to modulation (or demodulation). As an example, the seventh function separation 440 may be referred to as Option 6.

According to one embodiment, when large-capacity signal processing is expected, such as FR 1 MMU, function separation at a relatively high layer (e.g., fourth function separation 420b) may be required to reduce fronthaul capacity. . In addition, separation of functions at too high a layer (e.g., the sixth function separation 430) may cause a burden on the implementation of the RU due to the complicated control interface and the inclusion of multiple PHY processing blocks within the RU. Appropriate separation of functions may be required depending on the arrangement and implementation method of the and RU.

According to one embodiment, when precoding of data received from the DU cannot be processed (i.e., when there is a limit to the precoding capability of the RU), the third function separation 420a or a lower function is performed. Separation (e.g., second functional separation 410) may be applied. Conversely, if there is a capability to process precoding of data received from the DU, the fourth functional separation 420b or a higher functional separation (e.g., the sixth functional separation 430) may be applied.

According to one embodiment, hereinafter, upper-PHY refers to physical layer processing processed in the DU of the fronthaul interface. For example, the upper-PHY may include FEC encoding/decoding, scrambling, and modulation/demodulation. Hereinafter, sub-PHY refers to physical layer processing processed in the RU of the fronthaul interface. For example, the sub-PHY may include FFT/iFFT, digital beamforming, physical random access channel (PRACH) extraction and filtering. However, the above-described criteria do not exclude embodiments with other functional separations. Operations of the DU 210, operations of the RU 220, and signaling between the DU 210 and the RU 220, which will be described later, are not interpreted as limited by specific functional separation.

FIG. 5 illustrates an example of settings for deactivating some components of a radio unit (RU), according to embodiments.

Referring to FIG. 5, a system operator 501 may input a signal for setting a low power mode to control software 505 that controls a distributed unit (DU) 503. The DU 503 may perform radio link control (RLC), media access control (MAC), and some functions of the physical (PHY) layer (high PHY). The DU 503 may refer to the DU 210 of FIG. 2. The control software 505 can control the DU (503). For example, the control software may be a processor for operation, administration, and maintenance (OAM). However, it is not limited to this. RU 507, RU 509, and RU 511 can transmit and receive messages from the DU 503. The RU 507 may adjust whether to activate at least one component included in the RU 507 based on the message received from the DU 503. The RU 509 may adjust whether to activate at least one component included in the RU 509 based on the message received from the DU 503. The RU 511 may adjust whether to activate at least one component included in the RU 511 based on the message received from the DU 503. The RU (e.g., RU 507, RU 509, and/or RU 511) may be responsible for the remaining functions (low PHY) not performed by the DU 503 in the PHY layer.

According to one embodiment, the system operator 501, when traffic of the RU (e.g., RU 507, RU 509, or RU 511) is temporarily low, the system operator 501 In order to set the RU (hereinafter referred to as RU 507, RU 509, or RU 511) to the low power mode, a low power mode signal for setting the low power mode may be input to the control software 505. For example, traffic in the RU may be temporarily low during late night hours. For example, traffic in RUs located in residential areas may be temporarily low during morning hours. For example, traffic in RUs located in business areas may be temporarily low during evening hours. The system operator 501 may input a low-power mode signal to the control software 505 to set the RU to a low-power mode during a time when the RU's traffic is temporarily low.

According to one embodiment, the control software 505 sends a configuration request message for the DU 503 to set a low power mode to the RU through at least one transceiver (e.g., the transceiver 310 in FIG. 3A). Can be sent. The setup request message may include period information indicating the transmission period of the test request message and counter information indicating the maximum number of transmissions of the test request message. For example, the setup request message may include period information indicating a transmission period of about 1 hour and counter information number 5. The setup request message may include RU identifier information for identifying the RU and frequency band information for configuring the low power mode. For example, the configuration request message may include a port identification (ID) of the RU and information about a 3.5 giga-hertz (GHZ) band. The port ID of the RU can be used to check whether the configuration request message has been received by the RU to which the low power mode is to be configured. The frequency band information may be used to determine whether to deactivate at least one component of the RU for which band when one RU services multiple frequency bands. For example, the RU can service multiple frequency bands among the following frequency bands: about 800 MHz (Mega-Hertz), about 900 MHz, about 1.8 GHz (Giga-Hertz), about 1.9 GHz, about 2.6 GHz, and about 3.5 GHz. there is. The frequency band information included in the setup request message may indicate whether to set the low power mode for which of the frequency bands served by the RU. Because coverage decreases as frequency increases, components for frequencies around 3.5 GHz may be disabled during late night hours. The setup request message may be transmitted from the DU 503 to the RU through a common public radio interface (CPRI), an e-CPRI interface, or an open-radio access network (O-RAN) interface.

According to one embodiment, the RU 509 may deactivate the at least one component of the RU 509 after receiving the configuration request message. For example, the at least one component may be a transceiver. For example, the at least one component may be a counter block or another component other than memory. For example, the RU 509 may disable other components except the counter block or memory to save power. The counter block or the memory may be excluded from the at least one component to be deactivated in order to identify a test time based on period information. The memory may store the period information. For example, the memory may store period information on reaching the inspection time approximately every hour. The RU 509 in low power mode may disable at least one component to save power. In low power mode, the RU 509 may not receive messages from the DU 503 before the test time arrives. This may be because the DU 503 and components that transmit or receive messages were disabled to save power. The memory may be flash memory. The memory may be included within the RU 509. The memory may be placed outside of an FPGA (field programmable gate array) chip. The FPGA chip may include the counter block.

According to one embodiment, the RU 509 may transmit a test request message to the DU 503 to identify transition to normal mode based on the period information. For example, the RU 509 may activate a deactivated component approximately once an hour and transmit the inspection request message to the DU 503. The RU 509 may transmit a test request message based on the period information through the counter block and memory. The counter block can identify whether the inspection time point determined according to the period information has arrived. When the test time arrives, the counter block can activate at least one component necessary for transmitting a test request message and receiving a test response message. For example, at least one component required for transmitting a test request message and receiving a test response message may include a transceiver.

According to one embodiment, the DU 503 may receive the check request message to identify transition to normal mode from the RU 509. The RU 509 set to the low power mode may transmit the test request message to check whether to switch to the normal mode. According to one embodiment, the DU 503, in response to the test request message, sends a test response message indicating the low power mode or the normal mode to the RU 509. It can be sent to. The RU 509 may deactivate other components constituting the RU 509 based on a check response message indicating a low power mode. For example, the other components to be deactivated may be components excluding the counter block and the transceiver. Although the RU 509 is described as receiving a check response message indicating the low power mode, embodiments of the present disclosure are not limited thereto. For example, when in low power mode, the test response message may not be received from the DU 503 to the RU 509. When the test response message is not received, the RU 509 can identify it as indicating a low power mode. According to one embodiment, when the DU 503 obtains an input indicating the normal mode, the DU 503 may transmit the check response message indicating the normal mode to the RU 509. The DU 503 may obtain an input indicating a normal mode from the system operator 501 between the first inspection time and the second inspection time through the control software 505. The first test time may be a time when the first test request message identified based on the period information is transmitted after the low power mode is set. The second test time may be a time when the second test request message identified based on the period information is transmitted after the low power mode is set. For example, the first inspection point may be approximately 1 hour after setting the low power mode. The second inspection point may be approximately 2 hours after setting the low power mode. The DU 503 may transmit the test response message indicating the normal mode at the second test time. The test response message indicating the normal mode may correspond to an input indicating the normal mode.

According to one embodiment, the RU 509 may activate the at least one component of the RU 509 based on receiving the check response message indicating the normal mode. When the test response message indicating the normal mode is received, the RU 509 may activate the at least one component even if the number of transmissions of the test request message does not exceed the maximum number of transmissions. The RU 509 may activate the at least one component that is deactivated to save power in the low power mode in the normal mode.

According to one embodiment, the RU 509 may reboot the RU 509 based on receiving the test response message indicating the normal mode. The reboot can be performed through a booter. The booter may be an operating system (OS) for rebooting.

According to one embodiment, the RU 509 may switch to the normal mode when the number of transmissions of the inspection request message exceeds the maximum number of transmissions. This is because the setting request message for setting the low power mode includes a request to switch to the normal mode when the number of transmissions of the inspection request message exceeds the maximum number of transmissions. For example, the RU 509 may receive a setup request message including period information indicating approximately 1 hour and counter information indicating 4 times. When the test request message, which is transmitted approximately once per hour, is transmitted 5 times, the RU 509 can be switched to the normal mode. According to one embodiment, the RU 509 may activate the at least one component of the RU 509 when the number of transmissions of the test request message reaches the maximum number of transmissions. According to one embodiment, the RU 509 may reboot the RU 509 when the number of transmissions of the inspection request message exceeds the maximum number of transmissions.

FIG. 6 illustrates the functional configuration of a radio unit (RU) activated in a low-power mode, according to embodiments.

Referring to FIG. 6, the RU 220 may include a counter block 601, a transceiver 603, and a memory 370.

According to one embodiment, the counter block 601 may identify whether the inspection time point determined according to the period information has arrived. When the test time arrives, the counter block 601 may refer to the period information stored in the memory 370 and activate at least one component necessary for transmitting a test request message and receiving a test response message. . For example, at least one component required for transmitting a test request message and receiving a test response message may include a transceiver. The counter block may be an operating system (OS) within a field programmable gate array (FPGA) chip.

According to one embodiment, the memory 370 may store the period information. For example, the memory may store period information on reaching the inspection time approximately every hour. The memory 370 may be placed outside of an FPGA (field programmable gate array) chip.

According to one embodiment, the RU 220 may perform communication with a distributed unit (DU) (eg, DU 210 in FIG. 2) through the transceiver 603. The transceiver may include a transceiver.

According to one embodiment, after the RU (220) receives a configuration request message for setting a low power mode from the DU (210), the RU (220) includes components including a transceiver (603) to save power. can be disabled. For example, components including the transceiver 603 may not include the counter block 601 or memory 370. Components activated in low power mode may be the counter block 601 and memory 370. In the low power mode, based on the period information stored in the memory 370, the counter block 601 may activate some components of the RU 220 to transmit an inspection request message. Some of the components may include the transceiver 603. The activated transceiver 603 may transmit a test request message to the DU 210. The activated transceiver 603 may receive a test response message corresponding to the test request message from the DU 210. The test response message may indicate low power mode or normal mode. The RU 220 may deactivate other components constituting the RU 220 based on the check response message indicating the low power mode. For example, the other components to be deactivated may be components excluding the counter block 601 and the transceiver 603. Although the RU 220 is described as receiving a test response message indicating the low power mode, embodiments of the present disclosure are not limited thereto. For example, when in low power mode, the test response message may not be received from the DU 210 to the RU 220. When the test response message is not received, the RU 220 may identify it as indicating a low power mode. According to one embodiment, when the DU 210 obtains an input indicating the normal mode, the DU 210 may transmit the check response message indicating the normal mode to the RU 220. Input indicating the normal mode may be obtained from the system operator between the first inspection time and the second inspection time.

FIG. 7A shows an example of signaling between a distributed unit (DU) and a radio unit (RU) for switching to a normal mode based on counter information, according to embodiments.

Referring to FIG. 7A, in operation 701, according to one embodiment, a DU (eg, DU 210 in FIG. 2) may receive a signal indicating a low power mode. According to one embodiment, when the traffic of the RU (e.g., the RU 220 in FIG. 2) is temporarily low, the system operator uses a low power mode to set the RU 220 to a low power mode. A low power mode signal to set the mode can be input to the DU (210). For example, traffic of the RU 220 may be temporarily low during late night hours. For example, traffic in the RU 220 located in a residential area may be temporarily low during morning hours. For example, traffic in the RU 220 located in a business area may be temporarily low during evening hours. The system operator may input a low-power mode signal to the DU 210 to set the RU 220 to a low-power mode during a time when the traffic of the RU 220 is temporarily low.

According to one embodiment, in operation 703, the DU 210 may transmit a setup request message to the RU 220. The setup request message may include period information indicating the transmission period of the test request message and counter information indicating the maximum number of transmissions of the test request message. For example, the setup request message may include period information indicating a transmission period of about 1 hour and number 2 counter information.

According to one embodiment, the setup request message may further include RU (220) identifier information to identify the RU (220). For example, the configuration request message may include a port ID (identification) of the RU 220. The DU 210 may include the identifier information of the RU 220 in the configuration request message in order to explicitly indicate the RU for deactivation.

According to one embodiment, the setting request message may additionally include information on the frequency band for setting the low power mode. For example, the configuration request message may include a port identification (ID) of the RU 220 and information about a 3.5 giga-hertz (GHZ) band. The RU 220 may support multiple frequency bands. For example, RU 220 may support dual-band. The port ID of the RU 220 can be used to check whether the setup request message has been received by the RU 220 to set the low power mode. The frequency band information may be used to determine whether to deactivate at least one component of the RU 220 for which band when one RU 220 services multiple frequency bands. For example, the RU 220 supports a plurality of frequency bands among frequency bands of approximately 800 MHz (Mega-Hertz), approximately 900 MHz, approximately 1.8 GHz (Giga-Hertz), approximately 1.9 GHz, approximately 2.6 GHz, and approximately 3.5 GHz. Service is possible. The frequency band information included in the setup request message may indicate whether to set the low power mode for which of the frequency bands served by the RU 220. Because coverage decreases as frequency increases, components for frequencies around 3.5 GHz may be disabled during late night hours. The setup request message may be transmitted from the DU 503 to the RU 220 through a common public radio interface (CPRI), an e-CPRI interface, or an open-radio access network (O-RAN) interface.

At operation 705, according to one embodiment, the RU 220 may transmit a setup response message to the DU 210. Through the setup response message, the DU 210 can identify whether the low power mode has been set by transmitting the setup request message to the RU 220. According to one embodiment, the RU 220 may enter a low power mode after receiving the setup request message. In the low power mode, the RU 220 may deactivate the at least one component of the RU 220 to save power. For example, the at least one component may be a transceiver. For example, the at least one component may be a counter block or another component other than memory. For example, the RU 220 may deactivate other components except the counter block or memory to save power. The counter block or the memory may be excluded from the at least one component to be deactivated in order to identify a test time based on period information. The memory may store the period information. For example, the memory may store period information on reaching the inspection time approximately every hour. The RU 220 in low power mode may deactivate at least one component to save power. In low power mode, the RU 220 may not receive a message from the DU 210 before the test time arrives. This may be because the DU 210 and components that transmit or receive messages were disabled to save power. The memory may be flash memory. The memory may be included within the RU (220). The memory may be placed outside of an FPGA (field programmable gate array) chip. The FPGA chip may include the counter block.

In operation 707, according to one embodiment, the RU 220 may transmit a test request message to the DU 210. According to one embodiment, the RU 220 may transmit a test request message to the DU 210 to identify transition to the normal mode based on the period information. For example, the RU 220 may activate a deactivated component approximately once per hour and transmit the inspection request message to the DU 210. The RU 220 may transmit a test request message based on the period information through the counter block and the memory. The counter block can identify whether the inspection time point determined according to the period information has arrived. When the test time arrives, the counter block can activate at least one component necessary for transmitting a test request message and receiving a test response message.

In operation 709, according to one embodiment, the DU 210 may transmit a check response message to the RU 220. According to one embodiment, the DU 210 may transmit, in response to the test request message, a test response message indicating the low power mode to the RU 220. there is. The RU 220 may deactivate other components constituting the RU 220 based on the check response message indicating the low power mode. For example, the other components to be deactivated may be components excluding the counter block and the transceiver. Although the RU 220 is described as receiving a test response message indicating the low power mode, embodiments of the present disclosure are not limited thereto. For example, when in low power mode, the test response message may not be received from the DU 210 to the RU 220. When the test response message is not received, the RU 220 may identify it as indicating a low power mode.

In operation 711, according to one embodiment, the RU 220 may transmit the inspection request message to the DU 210. The RU 220 may identify the inspection time based on the cycle time. The test time may be the second time the cycle time is reached after entering the low power mode. The operation 707 may be referred to for the second transmitted inspection request message.

In operation 713, according to one embodiment, the DU 210 may transmit the check response message to the RU 220. The DU 210 may transmit a test response message corresponding to the second transmitted test request message to the RU 220. The operation 709 may be referenced for the second transmitted check response message.

In operation 715, according to one embodiment, the RU 220 may transmit the inspection request message to the DU 210. The RU 220 may identify the inspection time based on the cycle time. The test time may be the third time the cycle time is reached after entering the low power mode. The operation 707 may be referred to for the second transmitted inspection request message.

In operation 717, according to one embodiment, the DU 210 may transmit the check response message to the RU 220. The DU 210 may transmit the check response message to the RU 220. The DU 210 may transmit a test response message corresponding to the test request message transmitted thirdly to the RU 220. The operation 709 may be referred to for the third transmitted check response message.

According to one embodiment, the RU 220 may switch to the normal mode when the number of transmissions of the inspection request message exceeds the maximum number of transmissions. This is because the setting request message for setting the low power mode includes a request to switch to the normal mode when the number of transmissions of the inspection request message exceeds the maximum number of transmissions. For example, after receiving a setup request message with period information of approximately 1 hour and counter information of number 2, when the inspection request message, which is transmitted approximately once every hour, is transmitted three times, the RU 220 It can be switched to normal mode. According to one embodiment, the RU 220 may activate the at least one component of the RU 220 when the number of transmissions of the inspection request message exceeds the maximum number of transmissions. According to one embodiment, the RU 220 may reboot the RU 220 when the number of transmissions of the inspection request message exceeds the maximum number of transmissions. The reboot can be performed through a booter. The booter may be an operating system (OS) for rebooting.

FIG. 7B shows an example of signaling between a distributed unit (DU) and a radio unit (RU) for switching to a normal mode based on a check response message, according to embodiments.

Referring to FIG. 7B, in operation 751, according to one embodiment, a DU (eg, DU 210 in FIG. 2) may receive a signal indicating a low power mode. According to one embodiment, when the traffic of the RU (e.g., the RU 220 in FIG. 2) is temporarily low, the system operator uses a low power mode to set the RU 220 to a low power mode. A low power mode signal to set the mode can be input to the DU (210). For details on the setting request message, operation 701 of FIG. 7A may be referred to.

According to one embodiment, in operation 753, the DU 210 may transmit a setup request message to the RU 220. The setup request message may include period information indicating the transmission period of the test request message and counter information indicating the maximum number of transmissions of the test request message. For details on the setting request message, operation 703 of FIG. 7A may be referred to.

In operation 755, according to one embodiment, the RU 220 may transmit a setup response message to the DU 210. Through the setup response message, the DU 210 can identify whether the low power mode has been set by transmitting the setup request message to the RU 220. According to one embodiment, the RU 220 may enter a low power mode after receiving the setup request message. In the low power mode, the RU 220 may deactivate the at least one component of the RU 220 to save power. For information about the setup response message and low power mode, operation 705 of FIG. 7A may be referred to.

In operation 757, according to one embodiment, the RU 220 may transmit a test request message to the DU 210. According to one embodiment, the RU 220 may transmit a test request message to the DU 210 to identify transition to the normal mode based on the period information. For details on the inspection request message, operation 707 of FIG. 7A may be referred to.

In operation 759, according to one embodiment, the DU 210 may transmit a check response message to the RU 220. According to one embodiment, the DU 210 may transmit, in response to the test request message, a test response message indicating the low power mode to the RU 220. there is. For details on the test response message, operation 709 of FIG. 7A may be referred to.

In operation 761, according to one embodiment, the DU 210 may receive a signal indicating a normal mode. According to one embodiment, when the DU 210 obtains an input indicating the normal mode, the DU 210 may transmit the check response message indicating the normal mode to the RU 220. The DU 210 may obtain an input indicating a normal mode from the system operator between the first inspection time and the second inspection time. The first test time may be a time when the second test request message identified based on the period information is transmitted after the low power mode is set. The second test time may be a time when the third test request message identified based on the period information is transmitted after the low power mode is set. For example, the first inspection point may be approximately 2 hours after setting the low power mode. The second inspection point may be about 3 hours after setting the low power mode.

In operation 763, the DU 210 may transmit a setup request message to the RU 220. According to one embodiment, the RU 220 may transmit a test request message to the DU 210 to identify transition to the normal mode based on the period information. For details on the inspection request message, operation 707 of FIG. 7A may be referred to.

In operation 765, the RU 220 may transmit a setup response message to the DU 210. The DU 210 may transmit the test response message indicating the normal mode based on the normal mode input received between the first test time and the second test time. The test response message indicating the normal mode may correspond to an input indicating the normal mode.

According to one embodiment, the RU 509 may activate the at least one component of the RU 509 based on receiving the check response message indicating the normal mode. When the test response message indicating the normal mode is received, the RU 509 may activate the at least one component even if the number of transmissions of the test request message does not exceed the maximum number of transmissions. The RU 509 may activate the at least one component that is deactivated to save power in the low power mode in the normal mode.

According to one embodiment, the RU 509 may reboot the RU 509 based on receiving the test response message indicating the normal mode. The reboot may be performed through a booter, which is an operating system (OS).

FIG. 8 shows an example of a flow of operations of a distributed unit (DU) for reducing power consumption of a base station, according to embodiments.

Referring to FIG. 8, in operation 801, at least one processor (processor 330 of FIG. 3A) of a DU (e.g., DU 210 of FIG. 2) may obtain a low power mode input. According to one embodiment, the system operator sets a low-power mode to set the RU (220) to a low-power mode when the traffic of the RU (220) is temporarily low. A signal can be input to the DU (210). For example, traffic of the RU 220 may be temporarily low during late night hours. For example, traffic at RU 220 located in a residential area may be temporarily low during morning hours. For example, traffic at RU 220 located in a business area may be temporarily low during evening hours. The system operator may input a low-power mode signal to set the RU 220 to a low-power mode during a time when traffic of the RU 220 is temporarily low.

In operation 803, the at least one processor 330 of the DU 210 may transmit a configuration request message to the RU 220 to configure a low power mode. The setup request message includes period information to indicate the transmission period of the test request message, counter information to indicate the maximum number of transmissions of the test request message, RU identifier information to identify the RU, and configurable low power mode. It may contain information about the frequency band. For example, the setup request message may include period information indicating a transmission period of about 1 hour and counter information number 4. For example, the configuration request message may include a port identification (ID) of the RU and information about a 3.5 giga-hertz (GHZ) band. The port ID of the RU can be used to check whether the configuration request message has been received by the RU to which the low power mode is to be configured. The frequency band information may be used to determine whether to deactivate at least one component of the RU for which band when one RU services multiple frequency bands. For example, the RU can service multiple frequency bands among the following frequency bands: about 800 MHz (Mega-Hertz), about 900 MHz, about 1.8 GHz (Giga-Hertz), about 1.9 GHz, about 2.6 GHz, and about 3.5 GHz. there is. The frequency band information included in the setup request message may indicate whether to set the low power mode for which of the frequency bands served by the RU. Because coverage decreases as frequency increases, components for frequencies around 3.5 GHz may be disabled during late night hours. The setup request message may be transmitted from the DU 503 to the RU through a common public radio interface (CPRI), an e-CPRI interface, or an open-radio access network (O-RAN) interface.

In operation 805, the at least one processor 330 may receive an inspection request message from the RU 220. The RU 220 set to the low power mode may transmit the test request message based on period information to check whether to switch to the normal mode. For example, the RU 220 may activate a deactivated component approximately once per hour and transmit the inspection request message to the DU 210.

At operation 807, the at least one processor 330 of the DU 210 may identify whether input indicating normal mode has been obtained. Upon obtaining an input indicating normal mode, the at least one processor 330 of the DU 210 may perform operation 809. When no input indicating the normal mode is obtained, the at least one processor 330 of the DU 210 may perform operation 811. Even if the number of transmissions of the inspection request message of the RU 220 does not exceed the maximum number of transmissions, the system operator can activate the RU 220 through an input indicating the normal mode. The DU 210 may obtain an input indicating a normal mode from the system operator between the first inspection time and the second inspection time. The first test time may be a time when the first test request message identified based on the period information is transmitted after the low power mode is set. The second test time may be a time when the second test request message identified based on the period information is transmitted after the low power mode is set.

In operation 809, the at least one processor 330 of the DU 210 may transmit a check response message indicating normal mode. The normal mode may be a state in which the base station normally services the cell. The test response message indicating the normal mode can cause the RU 509 to activate the at least one component even if the number of transmissions of the test request message does not exceed the maximum number of transmissions.

In operation 811, the at least one processor 330 of the DU 210 may transmit a check response message indicating a low power mode. According to one embodiment, the test response message indicating the low power mode may be transmitted to the RU 220 in response to the test request message. Although the DU 210 is described as transmitting a test response message indicating the low power mode, embodiments of the present disclosure are not limited thereto. For example, when in low power mode, the test response message may not be received from the DU 210 to the RU 220.

FIG. 9 shows an example of a flow of operations of a radio unit (RU) for reducing power consumption of a base station, according to embodiments.

Referring to FIG. 9, in operation 901, at least one processor (processor 380 in FIG. 3B) of a RU (e.g., RU 220 in FIG. 2) sends a setup request message to set a low power mode. It can be received from a DU (e.g., DU 210 in FIG. 2). For details on the setting request message, operation 803 of FIG. 8 may be referred to.

In operation 903, the at least one processor 380 of the RU 220 may control to deactivate at least one component of the RU 220. According to one embodiment, the RU 220 may deactivate the at least one component of the RU 220 after receiving the configuration request message. For example, the at least one component may be a transceiver. For example, the at least one component may be a counter block or another component other than memory. For example, the RU 220 may deactivate other components except the counter block or memory to save power. The counter block or the memory may be excluded from the at least one component to be deactivated in order to identify a test time based on period information. The memory may store the period information. The RU 220 in low power mode may deactivate at least one component to save power. In low power mode, the RU 220 may not receive a message from the DU 210 before the test time arrives. This may be because the DU 210 and components that transmit or receive messages were disabled to save power. The memory may be flash memory. The memory may be included within the RU (220). The memory may be placed outside of an FPGA (field programmable gate array) chip. The FPGA chip may include the counter block.

In operation 905, the at least one processor 380 of the RU 220 may activate at least one component and transmit a test request message to the DU based on period information. For example, the RU 509 may activate a deactivated component approximately once an hour and transmit the inspection request message to the DU 503. The RU 509 may transmit a test request message based on the period information through the counter block and memory. The counter block can identify whether the inspection time point determined according to the period information has arrived. When the test time arrives, the counter block can activate at least one component necessary for transmitting a test request message and receiving a test response message. For example, at least one component required for transmitting a test request message and receiving a test response message may include a transceiver.

In operation 907, the at least one processor 380 of the RU 220 may identify whether the number of transmissions of the test request message exceeds the maximum number of transmissions. If the number of transmissions of the test request message exceeds the maximum number of transmissions, the at least one processor 380 of the RU 220 may perform operation 911. If the number of transmissions of the test request message does not exceed the maximum number of transmissions, the at least one processor 380 of the RU 220 may perform operation 909. This is because the setting request message for setting the low power mode includes a request to switch to the normal mode when the number of transmissions of the inspection request message exceeds the maximum number of transmissions.

In operation 909, the at least one processor 380 of the RU 220 may identify whether a check response message indicating a normal mode has been received from the DU 210. When receiving a test response message indicating a normal mode from the DU 210, the at least one processor 380 of the RU 220 may perform operation 911. When receiving a test response message indicating a normal mode from the DU 210, the at least one processor 380 of the RU 220 may perform operation 903. When receiving a test response message indicating the low power mode, the RU 220 can set the low power mode. That is, the RU 220 may deactivate components of the RU 220 to save power.

In operation 911, the at least one processor 380 may activate components of the RU 220. When receiving a test response message indicating the normal mode, the RU 220 can set the normal mode. That is, the RU 220 may activate components of the RU 220 to normally service the cell.

The effects that can be obtained from the present disclosure are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the description below. will be.

As described above, according to one embodiment, in an electronic device of a radio unit (RU) (220; 507; 509; 511), at least one transceiver (360; 365; 603), and the at least one transceiver ( It may include at least one processor 380 coupled with 360;365;603). The at least one processor 380 sends a configuration request message to a distributed unit (DU) (210; 251) for configuring a low power mode that deactivates at least one component of the RU (220; 507; 509; 511). It can be received from 503) through the at least one transceiver (360; 365; 603). The setup request message may include period information indicating the transmission period of the test request message and counter information indicating the maximum number of transmissions of the test request message. After receiving the configuration request message, the at least one processor 380 may control to deactivate the at least one component of the RU (220; 507; 509; 511). The at least one processor 380 may transmit the inspection request message to the DU (210; 251; 503) to identify transition to normal mode based on the period information. The at least one processor 380 is configured to transmit the RU (220; 507; 509) based on whether the number of transmissions of the test request message exceeds the maximum number of transmissions or when a test response message indicating a normal mode is received. ;511) can be controlled to activate the at least one component.

According to one embodiment, the setup request message may additionally include RU identifier information to identify the RU (220;507;509;511).

According to one embodiment, the setting request message may include information on a frequency band for setting the low power mode. After receiving the setting request message, in order to deactivate the at least one component, the at least one component may be deactivated with respect to the information in the frequency band. To activate the at least one component of the RU (220;507;509;511), the at least one component may be activated with respect to the information in the frequency band.

According to one embodiment, the at least one component may not include a counter block 601 and a memory 370 for activating the at least one component based on the period information. The memory 370 can store the period information. The counter block 601 can identify whether the inspection time point determined according to the period information has arrived.

According to one embodiment, in order to transmit the inspection request message, the at least one processor 380 may store the period information through the memory 370. In order to transmit the test request message, the at least one processor 380 can identify whether the test time determined according to the period information has arrived through the counter block 601. In order to transmit the test request message, the at least one processor 380 may activate at least one component for transmitting the test request message when the test time point is reached.

As described above, according to one embodiment, in an electronic device of a distributed unit (DU) (210; 251; 503), at least one transceiver 310, and at least one device coupled to the at least one transceiver 310 It may include one processor 330. The at least one processor 330 may send a configuration request message to set a low-power mode for deactivating at least one component of a radio unit (RU) 220;507;509;511. It can be sent to 509;511). The setup request message may include period information indicating the transmission period of the test request message and counter information indicating the maximum number of transmissions of the test request message. The at least one processor 330 may receive the test request message for identifying transition to normal mode from the RU (220; 507; 509; 511). The at least one processor 330, in response to the test request message, sends a test response message indicating the low power mode or the normal mode to the RU (220; 507; 509; 511). It can be sent to (220;507;509;511).

According to one embodiment, the at least one processor 330 may additionally include RU identifier information for identifying the RU (220;507;509;511) in the setup request message.

According to one embodiment, the setting request message may include information on a frequency band for setting the low power mode. The information in the frequency band may be referenced to activate or deactivate the at least one component of the RU (220;507;509;511).

According to one embodiment, the at least one component may not include a counter block 601 and a memory 370 for activating the at least one component based on the period information. The memory 370 can store the period information. The counter block 601 can identify whether the inspection time point determined according to the period information has arrived.

According to one embodiment, the at least one processor 330 may additionally obtain an input indicating a normal mode. The at least one processor 330 may transmit a check response message indicating the normal mode to the RU (220; 507; 509; 511) based on obtaining an input indicating the normal mode.

As described above, according to one embodiment, a method performed by a radio unit (RU) 220;507;509;511 disables at least one component of the RU (220;507;509;511). The method may include receiving a configuration request message for configuring a low power mode from a distributed unit (DU) 210; 251; 503 through the at least one transceiver (360; 365; 603). The setup request message may include period information indicating the transmission period of the test request message and counter information indicating the maximum number of transmissions of the test request message. The method may include controlling to deactivate the at least one component of the RU (220;507;509;511) after receiving the setup request message. The method may include transmitting the inspection request message to the DU (210; 251; 503) to identify transition to normal mode based on the period information. The method is based on whether the number of transmissions of the test request message exceeds the maximum number of transmissions or a test response message indicating a normal mode is received, the at least one of the RU (220; 507; 509; 511) It may include a control operation to activate the components of .

According to one embodiment, the setup request message may additionally include RU identifier information to identify the RU (220;507;509;511).

According to one embodiment, the setting request message may include information on a frequency band for setting the low power mode. After receiving the setting request message, in order to deactivate the at least one component, the at least one component may be deactivated with respect to the information in the frequency band. To activate the at least one component of the RU (220;507;509;511), the at least one component may be activated with respect to the information in the frequency band.

According to one embodiment, the at least one component may not include a counter block 601 and a memory 370 for activating the at least one component based on the period information. The memory 370 can store the period information. The counter block 601 can identify whether the inspection time point determined according to the period information has arrived.

According to one embodiment, the operation of transmitting the inspection request message may include the operation of storing the period information through the memory 370. The operation of transmitting the inspection request message may include an operation of identifying whether the inspection time point determined according to the period information has arrived through the counter block 601. The operation of transmitting the inspection request message may include activating at least one component for transmitting the inspection request message when the inspection time point is reached.

As described above, according to one embodiment, the method performed by the distributed unit (DU) (210;251;503) includes at least one component of the radio unit (RU) (220;507;509;511) It may include transmitting a configuration request message to the RU (220; 507; 509; 511) to set a low power mode that disables. The setup request message may include period information indicating the transmission period of the test request message and counter information indicating the maximum number of transmissions of the test request message. The method may include receiving the check request message from the RU (220; 507; 509; 511) to identify transition to normal mode. The method provides, in response to the test request message, a test response message indicating the low power mode or the normal mode to the RU (220;507;509;511). 511) may include an operation of transmitting.

According to one embodiment, the setup request message may additionally include RU identifier information to identify the RU (220;507;509;511).

According to one embodiment, the setting request message may include information on a frequency band for setting the low power mode. The information in the frequency band may be referenced to activate or deactivate the at least one component of the RU (220;507;509;511).

According to one embodiment, the at least one component may not include a counter block 601 and a memory 370 for activating the at least one component based on the period information. The memory 370 may store the period information. The counter block 601 can identify whether the inspection time point determined according to the period information has arrived.

According to one embodiment, the method may additionally include the operation of obtaining an input indicating the normal mode. A check response message indicating the normal mode may be transmitted to the RU (220; 507; 509; 511) based on obtaining an input indicating the normal mode.

Electronic devices according to various embodiments disclosed in this document may be of various types. Electronic devices may include, for example, portable communication devices (e.g., smartphones), computer devices, portable multimedia devices, portable medical devices, cameras, electronic devices, or home appliances. Electronic devices according to embodiments of this document are not limited to the above-described devices.

The various embodiments of this document and the terms used herein are not intended to limit the technical features described in this document to specific embodiments, but should be understood to include various changes, equivalents, or replacements of the embodiments. In connection with the description of the drawings, similar reference numbers may be used for similar or related components. The singular form of a noun corresponding to an item may include one or more of the items, unless the relevant context clearly indicates otherwise. As used herein, “A or B”, “at least one of A and B”, “at least one of A or B”, “A, B or C”, “at least one of A, B and C”, and “A Each of phrases such as “at least one of , B, or C” may include any one of the items listed together in the corresponding phrase, or any possible combination thereof. Terms such as "first", "second", or "first" or "second" may be used simply to distinguish one element from another, and may be used to distinguish such elements in other respects, such as importance or order) is not limited. One (e.g. first) component is said to be "coupled" or "connected" to another (e.g. second) component, with or without the terms "functionally" or "communicatively". Where mentioned, it means that any of the components can be connected to the other components directly (e.g. wired), wirelessly, or through a third component.

The term “module” used in various embodiments of this document may include a unit implemented in hardware, software, or firmware, and is interchangeable with terms such as logic, logic block, component, or circuit, for example. It can be used as A module may be an integrated part or a minimum unit of the parts or a part thereof that performs one or more functions. For example, according to one embodiment, the module may be implemented in the form of an application-specific integrated circuit (ASIC).

Various embodiments of the present document are one or more instructions stored in a storage medium (e.g., built-in memory 136 or external memory 138) that can be read by a machine (e.g., electronic device 101). It may be implemented as software (e.g., program 140) including these. For example, a processor (e.g., processor 120) of a device (e.g., electronic device 101) may call at least one command among one or more commands stored from a storage medium and execute it. This allows the device to be operated to perform at least one function according to the at least one instruction called. The one or more instructions may include code generated by a compiler or code that can be executed by an interpreter. A storage medium that can be read by a device may be provided in the form of a non-transitory storage medium. Here, 'non-transitory' only means that the storage medium is a tangible device and does not contain signals (e.g. electromagnetic waves). This term refers to cases where data is stored semi-permanently in the storage medium. There is no distinction between temporary storage cases.

Methods according to embodiments described in the claims or specification of the present disclosure may be implemented in the form of hardware, software, or a combination of hardware and software. When implemented as software, a computer-readable storage medium that stores one or more programs (software modules) may be provided. One or more programs stored in a computer-readable storage medium are configured for execution by one or more processors in an electronic device. One or more programs include instructions that cause the electronic device to execute methods according to embodiments described in the claims or specification of the present disclosure.

According to one embodiment, methods according to various embodiments disclosed in this document may be provided and included in a computer program product. Computer program products are commodities and can be traded between sellers and buyers. The computer program product may be distributed in the form of a machine-readable storage medium (e.g. compact disc read only memory (CD-ROM)) or through an application store (e.g. Play Store™) or on two user devices (e.g. It can be distributed (e.g. downloaded or uploaded) directly between smart phones) or online. In the case of online distribution, at least a portion of the computer program product may be at least temporarily stored or temporarily created in a machine-readable storage medium, such as the memory of a manufacturer's server, an application store's server, or a relay server.

In addition, the program may be distributed through a communication network such as the Internet, an intranet, a local area network (LAN), a wide area network (WAN), or a storage area network (SAN), or a combination thereof. It may be stored on an attachable storage device that is accessible. This storage device can be connected to a device performing an embodiment of the present disclosure through an external port. Additionally, a separate storage device on a communications network may be connected to the device performing embodiments of the present disclosure.

In the specific embodiments of the present disclosure described above, elements included in the disclosure are expressed in singular or plural numbers depending on the specific embodiment presented. However, singular or plural expressions are selected to suit the presented situation for convenience of explanation, and the present disclosure is not limited to singular or plural elements, and even elements expressed in plural may be composed of singular or singular. Even expressed components may be composed of plural elements.

According to various embodiments, each component (e.g., module or program) of the above-described components may include a single or plural entity, and some of the plurality of entities may be separately placed in other components. there is. According to various embodiments, one or more of the components or operations described above may be omitted, or one or more other components or operations may be added. Alternatively or additionally, multiple components (eg, modules or programs) may be integrated into a single component. In this case, the integrated component may perform one or more functions of each component of the plurality of components identically or similarly to those performed by the corresponding component of the plurality of components prior to the integration. . According to various embodiments, operations performed by a module, program, or other component may be executed sequentially, in parallel, iteratively, or heuristically, or one or more of the operations may be executed in a different order, or omitted. Alternatively, one or more other operations may be added.

Meanwhile, in the detailed description of the present disclosure, specific embodiments have been described, but of course, various modifications are possible without departing from the scope of the present disclosure.

Claims (20)

In the electronic device of RU (radio unit) (220;507;509;511),
at least one transceiver (360;365;603);
Comprising at least one processor (380) coupled to the at least one transceiver (360; 365; 603),
The at least one processor 380,
A configuration request message for configuring a low-power mode for deactivating at least one component of the RU (220;507;509;511) is sent from a distributed unit (DU) (210;251;503) to the at least one transceiver (360). ;365;603), and the setup request message includes period information to indicate the transmission cycle of the test request message and counter information to indicate the maximum number of transmissions of the test request message,
After receiving the setup request message, control to deactivate the at least one component of the RU (220;507;509;511),
Configured to transmit the test request message to the DU (210; 251; 503) to identify transition to normal mode based on the cycle information;
Based on whether the number of transmissions of the test request message exceeds the maximum number of transmissions or a test response message indicating a normal mode is received, the at least one component of the RU (220; 507; 509; 511) Controlling to activate,
Electronic devices.
In claim 1,
The setup request message additionally includes RU identifier information for identifying the RU (220;507;509;511).
Electronic devices.
In claim 1,
The setting request message includes information on a frequency band for setting the low power mode,
After receiving the setting request message, to deactivate the at least one component, the at least one component is deactivated with respect to the information in the frequency band,
To activate the at least one component of the RU (220;507;509;511), the at least one component is activated with respect to the information in the frequency band,
Electronic devices.
In claim 1,
The at least one component does not include a counter block 601 and a memory 370 for activating the at least one component based on the period information,
The memory 370 stores the period information,
The counter block 601 identifies whether the inspection time point determined according to the period information has been reached.
Electronic devices.
In claim 4,
To transmit the inspection request message, the at least one processor 380:
Storing the period information through the memory 370,
Through the counter block 601, it is identified whether the inspection time point determined according to the period information has arrived,
configured to activate at least one component for transmitting the inspection request message when the inspection time point is reached,
Electronic devices.
In the electronic device of distributed unit (DU) (210;251;503),
At least one transceiver (310);
Comprising at least one processor 330 coupled to the at least one transceiver 310,
The at least one processor 330,
A configuration request message for configuring a low-power mode that disables at least one component of a radio unit (RU) (220;507;509;511) is transmitted to the RU (220;507;509;511), and the configuration The request message includes period information to indicate the transmission cycle of the test request message and counter information to indicate the maximum number of transmissions of the test request message,
Receiving the test request message to identify transition to normal mode from the RU (220;507;509;511),
In response to the test request message, a test response message indicating the low power mode or the normal mode is sent to the RU (220;507;509;511). configured to transmit,
Electronic devices.
In claim 6,
The at least one processor 330,
The setup request message additionally includes RU identifier information for identifying the RU (220;507;509;511).
Electronic devices.
In claim 6,
The setting request message includes information on a frequency band for setting the low power mode,
The information in the frequency band is referenced to activate or deactivate the at least one component of the RU (220; 507; 509; 511),
Electronic devices.
In claim 6,
The at least one component does not include a counter block 601 and a memory 370 for activating the at least one component based on the period information,
The memory 370 stores the period information,
The counter block 601 identifies whether the inspection time point determined according to the period information has been reached.
Electronic devices.
In claim 6,
The at least one processor 330,
further configured to obtain an input indicating a normal mode,
A check response message indicating the normal mode is transmitted to the RU (220; 507; 509; 511) based on obtaining an input indicating the normal mode.
Electronic devices.
In a method performed by a radio unit (RU) (220;507;509;511),
At least one transceiver (360) receives a configuration request message from a distributed unit (DU) (210;251;503) for configuring a low-power mode for deactivating at least one component of the RU (220;507;509;511); 365;603), and the setup request message includes period information to indicate the transmission cycle of the test request message and counter information to indicate the maximum number of transmissions of the test request message,
After receiving the setup request message, controlling to deactivate the at least one component of the RU (220;507;509;511);
An operation of transmitting the inspection request message to the DU (210; 251; 503) to identify transition to normal mode based on the period information;
Based on whether the number of transmissions of the test request message exceeds the maximum number of transmissions or a test response message indicating a normal mode is received, the at least one component of the RU (220; 507; 509; 511) Including controlling operations to activate,
method.
In claim 11,
The setup request message additionally includes RU identifier information for identifying the RU (220;507;509;511).
method.
In claim 11,
The setting request message includes information on a frequency band for setting the low power mode,
After receiving the setting request message, to deactivate the at least one component, the at least one component is deactivated with respect to the information in the frequency band,
To activate the at least one component of the RU (220;507;509;511), the at least one component is activated with respect to the information in the frequency band,
method.
In claim 11,
The at least one component does not include a counter block 601 and a memory 370 for activating the at least one component based on the period information,
The memory 370 stores the period information,
The counter block 601 identifies whether the inspection time point determined according to the period information has been reached.
method.
In claim 14,
The operation of transmitting the inspection request message is,
An operation of storing the period information through the memory 370,
An operation of identifying whether an inspection time point determined according to the period information has been reached through the counter block 601;
When the inspection time point is reached, comprising activating at least one component for transmitting the inspection request message,
method.
In a method performed by a distributed unit (DU) (210;251;503),
An operation of transmitting a setup request message to a radio unit (RU) (220;507;509;511) to set a low-power mode that disables at least one component of the RU (220;507;509;511); The setup request message includes period information to indicate the transmission cycle of the test request message and counter information to indicate the maximum number of transmissions of the test request message,
Receiving the test request message from the RU (220; 507; 509; 511) to identify transition to normal mode;
In response to the test request message, a test response message indicating the low power mode or the normal mode is sent to the RU (220;507;509;511). Including the action of transmitting,
method.
In claim 16,
The setup request message additionally includes RU identifier information for identifying the RU (220;507;509;511).
method.
In claim 16,
The setting request message includes information on a frequency band for setting the low power mode,
The information in the frequency band is referenced to activate or deactivate the at least one component of the RU (220; 507; 509; 511),
method.
In claim 16,
The at least one component does not include a counter block 601 and a memory 370 for activating the at least one component based on the period information,
The memory 370 stores the period information,
The counter block 601 identifies whether the inspection time point determined according to the period information has been reached.
method.
In claim 16,
It additionally includes an operation for obtaining an input indicating a normal mode,
A check response message indicating the normal mode is transmitted to the RU (220; 507; 509; 511) based on obtaining an input indicating the normal mode.
method.

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