RF channel control device and base station device, and RF channel control method performed by the same

Abstract

To provide a new technical scheme for dynamically / optimally controlling an RF channel of a cell according to a situation.SOLUTION: The present invention proposes a new technical scheme for realizing a specific configuration for dynamically / optimally controlling an RF channel in consideration of both throughput of a cell and energy saving in an O-RAN system, and realizing an interface operation between O-RAN devices related thereto, thereby enabling dynamic / optimal control of the RF channel of the cell according to a situation.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to energy saving technology. This application claims priority to Korean Patent Application No. 10-2022-0126973, filed on October 5, 2022, the entire contents of which are incorporated herein by reference for all purposes. [Background technology]

[0002] In a mobile network for mobile communication services, a Radio Access Network (RAN) supports wireless connection between a terminal and a network.

[0003] Such RANs account for a significant portion of the energy consumption in mobile networks, and in particular, radio units (RUs) account for the largest portion of the energy consumption within the RAN.

[0004] In order to reduce OPEX (Operating Expense), communication service operators are increasingly interested in reducing the power consumption of base stations (especially RUs), and thus energy saving technologies are being introduced.

[0005] Meanwhile, with the advent of 5G, the increase in wireless speeds, the increase in fronthaul capacity due to the introduction of MIMO, and the growing need for additional infrastructure such as optical lines have led to increased costs for telecommunications service operators in installing and operating base stations. To address this issue, Open RAN (Radio Access Network, O-RAN) technology has emerged.

[0006] Simply put, O-RAN is a technology that standardizes interfaces that enable interoperability between equipment required to realize base station devices, and enables interoperability between RUs (Radio Units, hereinafter referred to as O-RUs) and DUs (Distributed Units, hereinafter referred to as O-DUs) from different manufacturers / vendors based on O-RAN.

[0007] In such an O-RAN system based on O-RAN, each piece of equipment developed by different manufacturers / vendors, namely CU (Centralized Unit, hereinafter referred to as O-CU), O-DU, O-RU, and intelligent base station control devices (e.g. SMO, RIC, etc.) for controlling the base station equipment (O-CU / O-DU / O-RU) consisting of these pieces of equipment, are structured to operate in conjunction with each other.

[0008] However, since the O-RAN system has a structure in which multi-vendor equipment such as O-CU, O-DU, O-RU, SMO, and RIC developed by different manufacturers / vendors operate in conjunction with each other, it is difficult to directly apply existing energy saving functions that operate based on the unique structures and algorithms of each manufacturer.

[0009] Therefore, the present invention proposes a specific configuration for dynamically / optimally controlling RF channels in an O-RAN system based on multi-vendor base station equipment and an interface operation between the O-RAN equipment related thereto. Summary of the Invention [Problem to be solved by the invention]

[0010] The problem to be solved by the present invention is to realize a specific configuration for dynamically / optimally controlling RF channels in an O-RAN system based on multi-vendor base station equipment and an interface operation between the O-RAN equipment related thereto. [Means for solving the problem]

[0011] An RF channel control device according to one embodiment of the present invention includes an information collection unit that collects information regarding a cell; and a control unit that determines an RF channel control technique to be applied to the cell from among a number of RF channel control techniques applicable to the cell using a specific value determined based on the collected information.

[0012] Specifically, the specific value may include at least one of a predicted performance degradation value of each technique calculated based on the collected information, a predicted energy consumption reduction value, and a cell status value determined based on the collected information.

[0013] Specifically, the collected information for the cell may include at least one of uplink and downlink radio resource usage rates for the cell, throughput, number of simultaneously connected UEs, UE location and distribution, mobility, service type information, energy consumption and efficiency, state transition, and time information for each state.

[0014] Specifically, the control unit can calculate a performance degradation predicted value and an energy consumption reduction predicted value for each of the multiple RF channel control techniques based on the collected information, and determine at least one RF channel control technique based on the energy consumption reduction predicted value from among the RF channel control techniques whose calculated performance degradation predicted values ​​are within a predefined range.

[0015] Specifically, the control unit may determine at least one RF channel control technique that satisfies an application condition consisting of at least one combination of a first condition of whether a preset RF channel control technique application time period is present, a second condition of whether a network load is equal to or lower than a preset load critical value, a third condition of whether an energy consumption reduction predicted value is equal to or higher than a preset reduction critical value, and a fourth condition of whether a performance degradation predicted value is equal to or lower than a preset degradation critical value, and may transmit a control command to apply the determined RF channel control technique to a Radio Unit (RU) of the cell, thereby causing the RU to reconfigure an RF channel according to the control command.

[0016] Specifically, the multiple RF channel control techniques can be divided into a technique for turning off or on some Tx / Rx arrays among the Tx / Rx arrays configured in the RU of the cell in a pattern that reflects the UE position and distribution, a technique for reducing or increasing the Tx power in the RU of the cell, and a technique for reducing or restoring the number of transmissions of a specific signal (Always-on Signal) that is transmitted periodically.

[0017] Specifically, the performance degradation prediction value for each of the above-mentioned multiple RF channel control techniques can be calculated using the performance degradation derived from the UE position for each simultaneously connected UE based on a performance degradation map that pre-learns the performance degradation degree when each RF channel control technique is applied compared to when the RF channel control technique is not applied for each position in a 3D grid.

[0018] Specifically, the control unit determines at least one RF channel control technique among the RF channel control techniques that has the largest predicted energy consumption reduction value, and the predicted energy consumption reduction value calculated for the at least one RF channel control technique can be calculated using an energy consumption reduction value when the at least one RF channel control technique is applied and an energy consumption increase value increased by applying the at least one RF channel control technique.

[0019] Specifically, the energy consumption increase value can be calculated by subtracting the energy consumption reduction value when the at least one RF channel control technique is applied from the energy consumption when the RF channel control technique is not applied, and reflecting the performance degradation prediction value calculated for the at least one RF channel control technique.

[0020] A distributed unit (DU) according to one embodiment of the present invention includes a function of transmitting a control command based on collected information for a cell controlled by the DU to a radio unit (RU) of the cell, so that the RU reconfigures an RF channel of the cell according to the control command; the control command may be a command to apply an RF channel control technique determined using a specific value confirmed based on the collected information from among a number of RF channel control techniques applicable to the cell.

[0021] According to one embodiment of the present invention, a radio unit (RU) forming a cell includes a function of reconfiguring an RF channel of the cell according to a control command transmitted based on collected information for the cell when the RU receives the control command; the control command may be a command to apply an RF channel control technique determined using a specific value confirmed based on the collected information from among a number of RF channel control techniques applicable to the cell.

[0022] An RF channel control method of an RF channel control device according to one embodiment of the present invention includes an information collection step of collecting information regarding a cell; and a technique determination step of determining an RF channel control technique to be applied to the cell using a specific value determined based on the collected information from among a number of RF channel control techniques applicable to the cell.

[0023] Specifically, the specific value may include at least one of a predicted performance degradation value of each technique calculated based on the collected information, a predicted energy consumption reduction value, and a cell status value determined based on the collected information.

[0024] Specifically, the technique determination step may include calculating a performance degradation prediction value and an energy consumption reduction prediction value for each of the plurality of RF channel control techniques based on the collected information, and determining at least one RF channel control technique based on the energy consumption reduction prediction value from among the RF channel control techniques whose calculated performance degradation prediction values ​​are within a predefined range.

[0025] Specifically, the technique determination step may determine at least one RF channel control technique that satisfies an application condition consisting of at least one combination of a first condition of whether a preset RF channel control technique application time period is present, a second condition of whether a network load is below a preset load threshold value, a third condition of whether an energy consumption reduction predicted value is above a preset reduction threshold value, and a fourth condition of whether a performance degradation predicted value is below a preset degradation threshold value, and transmit a control command for applying the determined RF channel control technique to a Radio Unit (RU) of the cell, so that the RU reconfigures the RF channel according to the control command.

[0026] Specifically, the performance degradation prediction value for each of the above-mentioned multiple RF channel control techniques can be calculated using the performance degradation derived from the UE position for each simultaneously connected UE based on a performance degradation map that pre-learns the performance degradation degree when each RF channel control technique is applied compared to when the RF channel control technique is not applied for each position in a 3D grid.

[0027] Specifically, the technique determination step determines at least one RF channel control technique from among the RF channel control techniques, which has the largest predicted energy consumption reduction value, and the predicted energy consumption reduction value calculated for the at least one RF channel control technique can be calculated using an energy consumption reduction value when applying the at least one RF channel control technique and an energy consumption increase value increased by applying the at least one RF channel control technique.

[0028] Specifically, the energy consumption increase value can be calculated by subtracting the energy consumption reduction value when the at least one RF channel control technique is applied from the energy consumption when the RF channel control technique is not applied, and reflecting the performance degradation prediction value calculated for the at least one RF channel control technique.

[0029] An RF channel control method performed in a distributed unit (DU) according to one embodiment of the present invention includes a step of transmitting a control command based on collected information for a cell controlled by the DU to a radio unit (RU) of the cell, so that the RU reconfigures an RF channel of the cell according to the control command; the control command may be a command to apply an RF channel control technique determined using a specific value confirmed based on the collected information from among a number of RF channel control techniques applicable to the cell.

[0030] According to one embodiment of the present invention, an RF channel control method performed in a radio unit (RU) forming a cell includes, when receiving a control command transmitted based on collected information for the cell, reconfiguring an RF channel of the cell according to the control command; the control command may be a command to apply an RF channel control technique determined using a specific value identified based on the collected information from among a number of RF channel control techniques applicable to the cell. Effect of the Invention

[0031] According to an embodiment of the present invention, in an O-RAN system based on multi-vendor base station equipment, a specific configuration for dynamically / optimally controlling RF channels is realized, and interface operations between related O-RAN equipment are realized.

[0032] As a result, according to the present invention, by utilizing the structure in which an intelligent base station control device (e.g., SMO, RIC, etc.) is introduced in the O-RAN system, it is possible to obtain the effect of dynamically / optimally controlling the RF channel of a cell according to the situation. [Brief description of the drawings]

[0033] [Figure 1] FIG. 1 is an exemplary diagram showing an O-RAN system structure. [Diagram 2] 1 is a block diagram showing configurations of an RF channel control device, a distributed unit (DU), and a radio unit (RU) according to an embodiment of the present invention. [Diagram 3] 1 is an exemplary diagram for explaining an RF channel control technique applicable to the present invention. [Figure 4] 1 is an exemplary diagram for explaining an RF channel control technique applicable to the present invention. [Diagram 5] 1 is an exemplary diagram for explaining an RF channel control technique applicable to the present invention. [Figure 6] 4 is a flowchart showing an embodiment of a call flow in which the RF channel control method of the present invention operates. [Figure 7] 4 is a flowchart showing an embodiment of a call flow in which the RF channel control method of the present invention operates. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0034] Various embodiments of the present invention will now be described with reference to the accompanying drawings.

[0035] The present invention relates to Open RAN (Radio Access Network, O-RAN) and energy saving technology.

[0036] In a mobile network for mobile communication services, a Radio Access Network (RAN) supports wireless connection between terminals and the network.

[0037] Such RANs account for a significant portion of the energy consumption in mobile networks, and in particular, radio units (RUs) account for the largest portion of the energy consumption within the RAN.

[0038] In order to reduce OPEX (Operating Expense), communication service operators are increasingly interested in reducing the power consumption of base stations (especially RUs), and thus energy-saving technologies are being introduced.

[0039] Meanwhile, with the advent of 5G, the increase in wireless speeds, the increase in fronthaul capacity due to the introduction of MIMO, and the growing need for additional infrastructure such as optical lines have led to increased costs for telecommunications service operators in installing and operating base stations. To address this issue, Open RAN (Radio Access Network, O-RAN) technology has emerged.

[0040] Simply put, O-RAN is a technology that standardizes interfaces that enable interoperability between equipment required to realize base station devices, and enables interoperability between RUs (Radio Units, hereinafter referred to as O-RU) and DUs (Distributed Units, hereinafter referred to as O-DU) from different manufacturers / vendors based on O-RAN.

[0041] In such an O-RAN system based on O-RAN, each piece of equipment developed by different manufacturers / vendors, namely CU (Centralized Unit, hereinafter referred to as O-CU), O-DU, O-RU, and intelligent base station control devices (e.g. SMO, RIC, etc.) for controlling the base station equipment (O-CU / O-DU / O-RU) consisting of these pieces of equipment, are structured to operate in conjunction with each other.

[0042] Figure 1 shows the structure of an O-RAN system.

[0043] As can be seen from FIG. 1, the O-RAN system is designed to have a structure for implementing an open and intelligent radio access network.

[0044] Such an O-RAN system can be broadly divided into a base station device that is separately embodied in O-CU, O-DU, and O-RU equipment, and an intelligent base station control device (e.g., SMO, RIC, etc.) for controlling the base station device.

[0045] In brief, the intelligent base station control device can be defined as SMO (Service Management and Orchestration Framework) and RIC (RAN Intelligent Controller).

[0046] In particular, the RIC, which corresponds to a controller for an intelligent wireless access network, can be divided into a Non-Real Time RIC (>1 second) hierarchy and a Near-Real Time RIC (0.01 seconds to 1 second) hierarchy based on control latency.

[0047] The Non-Real Time RIC layer performs artificial intelligence-based management through big data analysis and machine learning such as RAN policy management, network traffic patterns, terminal mobility patterns, service types, and quality of service (QoS) prediction patterns.

[0048] Policies generated by such Non-Real Time RICs (e.g., application conditions described below, performance degradation maps based on machine learning models, etc.) are distributed to Near-Real Time RICs via the A1 interface.

[0049] An O-RAN system based on Non-Real Time RIC can be said to be an O-RAN system based on a non-real-time intelligent base station controller.

[0050] The Near-Real Time RIC layer provides near real-time radio resource management functions, such as load balancing per terminal, management of resource blocks, as well as management of service quality and terminal mobility.

[0051] The Near-Real Time RIC layer can transmit control commands (e.g., handover, resource allocation, etc.) to the O-CU and O-DU via the E2 interface, collect measured data, and provide the data to the Non-Real Time RIC via the A1 interface. Through such interactions, control algorithms for load balancing, mobility management, etc. are optimized.

[0052] An O-RAN system in which Near-Real Time RIC is introduced can be said to be an O-RAN system based on a near-real-time intelligent base station control device.

[0053] The O-CU is divided into a control plane (O-CU-CP) that transmits control information and a user plane (O-CU-UP) that transmits traffic, and performs control commands transmitted from a Non-Real Time RIC or a Near-Real Time RIC. The O-CU supports F1 / W1 / E1 / X2 / Xn interfaces defined in the 3GPP standard.

[0054] The O-DU is responsible for Radio Link Control, real-time Layer 2 (L2) functions of the Medium Access Control layer, and baseband signal processing.

[0055] The O-RU performs radio signal processing.

[0056] An open fronthaul interface is defined between the O-DU and the O-RU.

[0057] As shown in Figure 1, the O-RAN system has a structure in which equipment such as O-CU, O-DU, O-RU, SMO, and RIC developed by different manufacturers / vendors operate in conjunction with each other.

[0058] However, since the O-RAN system has a structure in which multi-vendor equipment such as O-CU, O-DU, O-RU, SMO, and RIC developed by different manufacturers / vendors operate in conjunction with each other, it is difficult to directly apply existing energy saving functions that operate based on the unique structures and algorithms of each manufacturer.

[0059] Therefore, various research and attempts are underway to incorporate energy saving features in O-RAN systems.

[0060] For example, in the case of RF channel control in existing energy saving technologies, a single control technique set by an operator to suit the conditions is fixedly applied, and there is a limitation in that it is not possible to dynamically select and apply the optimal technique to suit the situation.

[0061] On the other hand, the O-RAN structure introduces an intelligent base station controller, which makes it possible to select and apply the optimal RF channel control technique according to the situation.

[0062] Therefore, the present invention proposes a specific configuration for dynamically / optimally controlling RF channels in consideration of both cell throughput and energy saving in an O-RAN system based on multi-vendor base station equipment, and an interface operation between O-RAN equipment related thereto.

[0063] Specifically, the present invention aims to realize a specific configuration capable of dynamically / optimally controlling the RF channel of a cell according to the situation by utilizing the structure in which an intelligent base station control device (e.g., SMO, RIC, etc.) is introduced in the O-RAN system, and to propose a specific technology for realizing the interface operation between the related O-RAN equipment.

[0064] FIG. 2 shows an apparatus for implementing the technology proposed in the present invention, i.e., the RF channel control method, and shows an RF channel control device 100, a distributed unit (DU) that constitutes a base station device 70, and a radio unit (RU).

[0065] Prior to detailed description, the RF channel control device 100 of the present invention can be implemented in an intelligent base station control device (eg, SMO, Non-Real Time RIC, Near-Real Time RIC, etc.).

[0066] However, for convenience of explanation, FIG. 2 shows an O-RAN system structure based on a non-real-time intelligent base station controller, and illustrates a case where the RF channel control device 100 of the present invention is embodied in an intelligent base station controller (e.g., SMO, Non-Real Time RIC).

[0067] Also, while FIG. 2 shows one base station device 70 of the present invention under the control of the RF channel control device 100, this is for convenience of explanation and diagram, and multiple base station devices 70 may be present.

[0068] Although one radio unit 60 is shown coupled to base station module 50 in base station unit 70, this is again for ease of explanation and diagram, and multiple O-RUs 60 may be present.

[0069] However, for convenience of explanation, the specific explanation will be continued below based on the illustration in FIG.

[0070] First, a specific configuration of the RF channel control device 100 of the present invention will be described with reference to FIG.

[0071] As shown in FIG. 2, an RF channel control device 100 according to an embodiment of the present invention may include an information collecting unit 110 and a control unit 120.

[0072] The entire configuration of the RF channel control device 100 or at least a part of it may be implemented in the form of a hardware module or a software module, or may be implemented in the form of a combination of a hardware module and a software module.

[0073] Here, the software module may be understood as, for example, an instruction executed by a processor that controls operations within the RF channel control device 100, and such an instruction may be in the form of being stored in a memory within the RF channel control device 100.

[0074] In conclusion, the RF channel control device 100 according to the embodiment of the present invention realizes the embodied technology proposed in the present invention, i.e., the RF channel control method, through the above-mentioned configuration. Below, each component in the RF channel control device 100 will be described in more detail.

[0075] The information collecting unit 110 is responsible for collecting information related to cells.

[0076] In this case, the information regarding the cell collected by the information collector 110 can be collected from an O-RAN support CU (Centralized Unit, O-CU) or O-DU (Distributed Unit, O-DU) via a management interface (O1 interface) defined between components of SMO (Service Management and Orchestration) and O-RAN.

[0077] A base station device 70 to which the present invention is applied can be divided into a base station module 50 and a radio device 60.

[0078] When the present invention relates to an O-RAN system, the base station module 50 may be an O-RAN supporting CU (O-CU 56) and an O-RAN supporting DU (O-DU 53), and the radio device 60 may be an O-RAN supporting RU (Radio Unit, O-RU 60).

[0079] To explain a specific embodiment, each base station device 70 (particularly, O-CU 56 or O-DU 53) under the control of the RF channel control device 100 can transmit information regarding the cell of each O-RU 60 connected to it to the RF channel control device 100.

[0080] The information transmitted to the RF channel control device 100 may include uplink and downlink radio resource usage rates, throughput, number of simultaneously connected UEs, UE location and distribution, mobility, service type information, etc. for the cell of the O-RU 60.

[0081] In addition, the information transmitted to the RF channel control device 100 may further include the energy consumption and efficiency of the O-RU 60, state transition, time information for each state, and the like.

[0082] Here, the energy consumption and efficiency, state transition, and time information for each state are information generated in the O-RU 60, and this can be transmitted to the O-DU 53 → O-CU 56 → RF channel control device 100 or the O-DU 53 → RF channel control device 100 and used as collection information for the cells of the O-RU 60.

[0083] Furthermore, each base station device 70 (particularly, O-CU56 or O-DU53) can transmit information about the cell generated as described above (e.g., uplink / downlink radio resource usage rate, throughput, number of simultaneously connected UEs, UE location and distribution, mobility, service type information, energy consumption and efficiency of O-RU60, state transition, time information for each state, etc.) to the RF channel control device 100 periodically or continuously at the time of generation.

[0084] Therefore, in the present invention, the O-RAN cell control device 100 (information collection unit 110) can collect information regarding the cell of the O-RU 60 from each base station device 70 (particularly, the O-CU 56 or the O-DU 53) under its control.

[0085] At this time, information about the cell can be collected from each base station device 70 (particularly, the O-CU 56 or the O-DU 53) via the O1 interface defined between the components of the SMO and the O-RAN.

[0086] In this manner, the present invention defines an operation in which the RF channel controller 100 implemented in an intelligent base station controller collects information on cells from each base station device (O-CU, O-DU) using the O1 interface.

[0087] The control unit 120 is responsible for determining an RF channel control technique to be applied to the cell of the O-RU 60 from among a number of RF channel control techniques applicable to the cell of the O-RU 60 using a specific value confirmed based on the collected information.

[0088] Here, the specific value may include at least one of a predicted performance degradation value of each technique calculated based on the collected information, a predicted energy consumption reduction value, and a cell status value determined based on the collected information.

[0089] In one embodiment, the controller 120 may calculate a performance degradation prediction value and an energy consumption reduction prediction value for each of a number of RF channel control techniques based on information previously collected about the cell of the O-RU 60.

[0090] The control unit 120 may then select an RF channel control technique from among a number of RF channel control techniques, the RF channel control technique having the previously calculated performance degradation predicted value within a predefined allowable range, and determine at least one RF channel control technique from among the selected RF channel control techniques based on the energy consumption reduction predicted value.

[0091] In addition, in one embodiment, the control unit 120 can determine, based on information previously collected about the cell of the O-RU 60, from among a number of RF channel control techniques, at least one RF channel control technique that satisfies preset application conditions as the RF channel control technique to be applied to the cell of the O-RU 60.

[0092] In this case, the application condition may be a combination of at least one of the following conditions: a first condition of whether or not it is a time period during which a predetermined RF channel control technique is applied; a second condition of whether or not the network load is below a predetermined load critical value; a third condition of whether or not the energy consumption reduction predicted value is above a predetermined reduction critical value; and a fourth condition of whether or not the performance degradation predicted value is below a predetermined degradation critical value.

[0093] For example, an embodiment assuming an application condition consisting of a combination of the third and fourth conditions will be described as follows.

[0094] The controller 120 may calculate a performance degradation prediction value and an energy consumption reduction prediction value for each of a number of RF channel control techniques based on information previously collected for the cell of the O-RU 60.

[0095] Therefore, the controller 120 can select an RF channel control technique whose previously calculated performance degradation predicted value is equal to or less than the degradation threshold value (within a predefined tolerance range) according to the fourth condition from among a number of RF channel control techniques.

[0096] The control unit 120 can then determine, from among the selected RF channel control techniques, at least one RF channel control technique (single or a combination of two or more) whose previously calculated energy consumption reduction predicted value is greater than or equal to the reduction critical value according to the third condition and is the maximum, as the optimal RF channel control technique to be applied to the cell of O-RU 60.

[0097] An embodiment assuming application conditions consisting of a combination of the first to fourth conditions will be described below.

[0098] When the RF channel control techniques according to the first and second conditions are applied during a certain period of time and the network load confirmed through real-time monitoring is below a critical load value, the control unit 120 can select and determine as optimal at least one RF channel control technique (single or a combination of two or more) according to the third and fourth conditions from among the multiple RF channel control techniques as described above.

[0099] Here, in the present invention, various types of techniques can be defined as a number of RF channel control techniques applicable to the cell of the O-RU 60.

[0100] As an example, multiple RF channel control techniques can be defined, including a first technique of turning off or on some Tx / Rx arrays configured in the O-RU of a cell in a pattern that reflects the UE position and distribution, a second technique of decreasing or increasing the Tx power in the O-RU of a cell, and a third technique of decreasing or restoring the number of transmissions of a specific signal (Always-on Signal) that is transmitted periodically.

[0101] The above-mentioned RF channel control technique will now be described in detail with reference to FIGS.

[0102] FIG. 3 shows a first technique of turning off or on some Tx / Rx arrays.

[0103] The first technique is a technique for controlling the RF channel configuration by turning off 1 / 4 RF Chains, 1 / 2 RF Chains, 3 / 4 RF Chains, or turning on the RF Chains that have been turned off among all the RF Chains (Tx / Rx array) of the O-RU 60 that serves the cell of the O-RU 60.

[0104] In the case of this first technique, power consumption can be reduced by the number of RF chains that are turned off, and the coverage form, such as beam width and number of layers in the vertical / horizontal directions, changes depending on the RF chains (Tx / Rx array) pattern that is turned off.

[0105] Therefore, in the first technique, the UE position and distribution must be reflected when selecting a pattern for some RF Chains (Tx / Rx arrays) to be turned off.

[0106] Specifically, as the number of Tx / Rx arrays in the horizontal or vertical direction increases, the beam width in the corresponding direction becomes narrower and sharper, and the number of orthogonal beams that can be assigned increases, thereby improving single user (SU) and multiple user (MU) performance.

[0107] Therefore, to explain the case of determining and applying the first technique for turning off 1 / 2 RF Chains, by reflecting the UE position and distribution within the coverage, if the UEs are distributed mainly in the vertical direction, a pattern that reduces the number of rows of the Tx / Rx array (right, left pattern) can be determined and applied, and if the UEs are distributed mainly in the horizontal direction, a pattern that reduces the number of rows of the Tx / Rx array (right, right pattern) can be determined and applied.

[0108] On the other hand, FIG. 5 shows a second technique for decreasing or increasing the Tx power.

[0109] The second technique is a technique for controlling the RF channel configuration by reducing the Tx power in all RF Chains (Tx arrays) serving the cell of O-RU 60 by half, by quarter, or by increasing the reduced Tx power back to maximum (Max).

[0110] In the case of this second technique, since the size of the coverage is reduced by only reducing the Tx power and the shape of the coverage such as beam width and number of beams / layers does not change, it can be determined and applied when UEs are distributed evenly mainly in the central area of ​​the cell.

[0111] Meanwhile, the third technique is a technique for controlling the RF channel configuration by reducing or restoring the number of transmissions of a specific signal (always-on signal) that is periodically transmitted.

[0112] For example, assuming an SSB (Synchronization Signal Block) as a specific signal (Always-on Signal), the third technique can control the RF channel configuration by lengthening the SSB transmission period to reduce the number of SSB transmissions, reducing the number of SSBs transmitted per period to reduce the number of SSB transmissions, or restoring the number of SSB transmissions by lengthening the SSB transmission period or returning the reduced number of SSBs.

[0113] The third technique has a smaller reduction in power consumption than the first and second techniques, but has the advantage of being able to maintain the coverage and data transmission performance unchanged.

[0114] In this manner, the control unit 120 can calculate a performance degradation prediction value and an energy consumption reduction prediction value for each of a number of RF channel control techniques (e.g., RF channel control first, second, and third techniques) based on information collected for the cell of the O-RU 60.

[0115] The control unit 120 can then determine an optimal RF channel control technique (a single technique or a combination of two or more techniques) from among each RF channel control technique (e.g., the first, second, and third techniques) according to the above-mentioned application conditions using the performance degradation prediction value and the energy consumption reduction prediction value.

[0116] A configuration for determining an optimal RF channel control technique (a single technique or a combination of two or more techniques) in the present invention will be specifically described below.

[0117] First, the control unit 120 can calculate a performance degradation prediction value for each of a number of RF channel control techniques using the performance degradation derived from the UE position for each simultaneously connected UE based on a performance degradation map that has been pre-learned for each position in a 3D grid to determine the degree of performance degradation when each RF channel control technique is applied compared to when the RF channel control technique is not applied.

[0118] Specifically, in the present invention, the degree of performance degradation when each RF channel control technique (e.g., first, second, and third techniques) is applied compared to when no RF channel control technique is applied is pre-learned for each position in a 3D grid through a pre-defined machine learning model, and a performance degradation map can be generated / constructed as a result of the pre-learning.

[0119] If the performance degradation map thus pre-learned is represented in a table, it can be expressed as shown in Table 1 below. [Table 1]

[0120] Therefore, the control unit 120 can calculate a performance degradation prediction value for each of a number of RF channel control techniques using the performance degradation derived from the UE position for each currently simultaneously connected UE based on the performance degradation map pre-learned for each position in the 3D grid, according to the following Equation 1.

number

[0121] Here, Weight Service Type is a performance degradation weighting value applied according to the service type and can range from 0 to 1. For example, a value of 1 is applied for a data call and a value of 0.7 is applied for VoNR, so that the performance degradation due to VoNR can be reflected with a higher weighting.

[0122] and,

number

[0123] That is, the controller 120 calculates the performance degradation (

number

number

[0124] Alternatively, the control unit 120 may calculate a performance degradation prediction value for each of a number of RF channel control techniques using the performance degradation derived from the UE position for each currently simultaneously connected UE based on a performance degradation map pre-learned for each position in the 3D grid, according to the following Equation 2.

number

[0125] That is, the controller 120 calculates the performance degradation (

number

number

number

number

[0126] For example, assuming that the predefined tolerance range is 20% performance degradation, the control unit 120 calculates a predicted performance degradation value when applied to multiple RF channel control techniques (e.g., first, second, and third techniques) using the above-mentioned Equation 1 or 2 based on the collected information, and if the calculated performance degradation values ​​for the first, second, and third RF channel control techniques are 10%, 25%, and 5%, respectively, the control unit 120 can select the first and third RF channel control techniques.

[0127] The control unit 120 can then determine an optimal RF channel control technique (single or a combination of two or more) from the selected first and third RF channel control techniques based on the predicted energy consumption reduction value calculated by the following Equation 3.

[0128]

number

[0129] Here, Energy Consumption Reduction TX / RX Off is the energy consumption reduction value when the first technique is applied, Energy Consumption Reduction Power reduction is the energy consumption reduction value when the second technique is applied, Energy Consumption Reduction Always on signal reduction means the energy consumption saving value when the third technique is applied.

[0130] And Energy Consumption Increase Performance degradation means the energy consumption increase value that is increased by applying the RF channel control technique to be applied.

[0131] If the RF channel control technique is applied in the present invention, performance (throughput) degradation occurs for the UE, which leads to an increase in PRB Usage and an increase in power consumption for elements to which the RF channel control technique is not applied. Therefore, the expected energy consumption reduction is increased. Performance degradation It is necessary to reflect this. Such an Energy Consumption Increase Performance degradation ) is calculated by subtracting the energy consumption reduction value when the RF channel control technique to be applied from the energy consumption when the RF channel control technique to be applied is applied, and then multiplying it by the predicted performance degradation value (

number

[0132] That is, the control unit 120 calculates the energy consumption increase value according to the following Equation 4. Performance degradation ) can be calculated.

number

[0133] Therefore, assuming that the first and third RF channel control techniques are selected, for which the performance degradation prediction value is calculated to be within the acceptable range of 20% as described above, the control unit 120 can calculate the energy consumption reduction prediction value for the first RF channel control technique, the third RF channel control technique, and a combination of the first and third RF channel control techniques, respectively, using the above-mentioned Equation 3, as shown in the following Equation 5.

number

[0134] The control unit 120 can determine at least one RF channel control technique (the first technique, the third technique, or the combination of the first and third techniques) that maximizes the predicted energy consumption reduction value as the optimal RF channel control technique based on the predicted energy consumption reduction value calculated for each of the first RF channel control technique, the third RF channel control technique, and the combination of the first and third RF channel control techniques.

[0135] As described above, once the control unit 120 determines the optimal RF channel control technique (single or a combination of two or more) to apply to the cell of the O-RU 60, it can transmit a control command to the O-RU 60 of the corresponding cell to apply the determined RF channel control technique, so that the O-RU 60 can reconfigure the RF channel in accordance with the control command.

[0136] For example, the control unit 120 can transmit the above control command to the O-DU 53 connected to the O-RU 60 via the O1 interface defined between the SMO and the components of the O-RAN.

[0137] Alternatively, the control unit 120 can transmit the above control command via the O1 interface to the O-CU 56 that controls the O-DU 53 connected to the O-RU 60, so that the control command is transmitted to the O-DU 53 by the O-CU 56.

[0138] In this way, the base station module 50 (O-CU 56 / O-DU 53) that receives the transmission of the control command via the O1 interface can transmit the control command to the O-RU 60 in a manner of controlling the radio device 60 (O-RU 60) of the corresponding cell according to the received control command. Therefore, the O-RU 60 can reconfigure the RF channel according to the control command.

[0139] At this time, the control by the control command can be performed / transmitted via the interface (hereinafter, Open Fronthaul M-Plane) defined in the Open RAN (Radio Access Network, O-RAN) Fronthaul.

[0140] On the other hand, the control unit 120 can also transmit the above control command to the O-RU 60 via the Open Fronthaul M-Plane so that the RF channel is reconfigured according to the control command received by the O-RU 60.

[0141] Thus, in the present invention, by utilizing the O1 interface or the Open Fronthaul M-Plane, the RF channel control device 100 embodied in the intelligent base station control device can transmit a control command for applying the RF channel control technique for the cell to the O-RU of each base station device (especially, O-CU / O-DU).

[0142] Hereinafter, a specific configuration of the base station device 70 of the present invention will be described with reference to FIG.

[0143] As shown in FIG. 2, in one embodiment of the present invention, a base station device 70 may be composed of a base station module 50 and a wireless device 10 (RU or O-RU) of the present invention.

[0144] And, the base station module 50 can include a distributed unit 53 (DU or O-DU) of the present invention.

[0145] The entire configuration of the base station device 70 or at least a part of it may be implemented in the form of a hardware module or a software module, or may be implemented in the form of a combination of a hardware module and a software module.

[0146] Here, a software module can be understood as, for example, an instruction word executed by a processor that controls operations within the base station device 70, and such an instruction word may have a form in which it is stored in a memory within the base station device 70.

[0147] In conclusion, the base station device 70 according to the embodiment of the present invention realizes the embodied technology proposed in the present invention, i.e., the RF channel control method, through the above-mentioned configuration, and each component in the base station device 70 will be described in more detail below.

[0148] Prior to the description, since the present invention relates to an O-RAN system, the base station module 50 may be an O-RAN supporting CU, i.e., O-CU 56, and an O-RAN supporting DU, i.e., O-DU 53, and the radio device 60 may be an O-RAN supporting RU, i.e., O-RU 60.

[0149] The base station module 50 (O-DU 53 or O-CU 56 ) can communicate information regarding the cell of each O-RU 60 under its control to the RF channel control device 100 .

[0150] In addition, the O-RU 60 of the present invention generates information including at least one of the energy consumption and efficiency, state transition, and time for each state for itself (RU), and enables the information to be used as collection information for the cell of the O-RU 60.

[0151] That is, O-RU 60 generates energy consumption and efficiency, state transition, and time information for each state for itself (O-RU), and transmits this to O-DU 53 → O-CU 56 → RF channel control device 100 or O-DU 53 → RF channel control device 100 so that it can be used as collection information for the cell of O-RU 60.

[0152] More specifically, the present invention can define a message format for transmitting the energy consumption and efficiency of the O-RU, state transition, and time information for each state.

[0153] For example, the energy consumption / efficiency request message transmitted from the RF channel control device 100 / O-DU 53 to the O-RU 60 can be defined as follows. [Table 2]

[0154] Here, Power means power consumption, Voltage means voltage, Current means current, and performance_ratio means the operation rate of the object being measured compared to Full-spec.

[0155] And, the energy consumption / efficiency report message transmitted from the O-RU 60 to the O-DU 53 / RF channel control device 100 can be defined as follows. [Table 3]

[0156] When the O-RU 60 of the present invention receives a control command transmitted based on collected information for its own cell, it can perform a function of reconfiguring the RF channel of the cell according to the control command.

[0157] Specifically, as described above, the base station module 50 (O-CU56 / O-DU53) that receives a control command from the RF channel control device 100 of the present invention via the O1 interface can transmit the control command to the radio unit 60 (O-RU60) of the corresponding cell in a manner that controls the O-RU60 in accordance with the received control command.

[0158] Thus, the O-RU 60 of the present invention can reconfigure the RF channels for the cells according to the control instructions received.

[0159] In this case, the control based on the control command may be performed through an interface defined in the Open RAN (Radio Access Network, O-RAN) Fronthaul.

[0160] As can be seen from FIG. 1, in the O-RAN system, in addition to the Open Fronthaul CUS-Plane (Open Fronthaul C-Plane, U-Plane, S-Plane), an Open Fronthaul M-Plane is also defined in the O-RAN Fronthaul between O-CU56 / O-DU53 and O-RU60.

[0161] Briefly, the Open Fronthaul C-Plane provides an interface for transmitting control information such as scheduling information and beamforming information, the Open Fronthaul U-Plane provides an interface for data transmission, and the Open Fronthaul S-Plane provides an interface for transmitting timing and synchronization information.

[0162] In addition to the above-mentioned Open Fronthaul CUS-Plane, the present invention aims to utilize the Open Fronthaul M-Plane defined as an interface for remote O-RU initialization, configuration, management, etc.

[0163] Alternatively, the O-RU 60 of the present invention can receive control commands from the RF channel control device 100 of the present invention via the open fronthaul M-Plane, as described above.

[0164] Thus, the O-RU 60 of the present invention can reconfigure the RF channels for the cells according to the control instructions received.

[0165] In this manner, in the present invention, by utilizing the O1 interface or the Open Fronthaul M-Plane, the RF channel control device 100 embodied in an intelligent base station control device can define an operation of transmitting a control command to the O-RU of each base station device (particularly, the O-CU / O-DU) to apply an RF channel control technique for a cell.

[0166] As can be seen from the above description, according to the present invention, in an O-RAN system based on multi-vendor base station equipment, a specific configuration for dynamically / optimally controlling RF channels taking into consideration both cell throughput and energy saving is realized, and interface operation between related O-RAN equipment is realized.

[0167] As a result, according to the present invention, by utilizing the structure in which an intelligent base station control device (e.g., SMO, RIC, etc.) is introduced in the O-RAN system, it is possible to obtain the effect of dynamically / optimally controlling the RF channel of a cell according to the situation.

[0168] Meanwhile, in the above, an embodiment has been described in which the RF channel control device 100 of the present invention is embodied in an intelligent base station control device (e.g., SMO, Non-Real Time RIC) in an O-RAN system structure based on a non-real-time intelligent base station control device.

[0169] However, the present invention can also be applied to an O-RAN system structure based on a near-real-time intelligent base station controller, in which case the RF channel control device 100 of the present invention can be embodied in an intelligent base station controller (e.g., SMO, Near-Real Time RIC).

[0170] Hereinafter, an embodiment of a call flow in which the RF channel control method of the present invention operates will be described with reference to FIG. 6 and FIG.

[0171] In the following description, for convenience of explanation, the contents shown in FIG. 2 will be referred to.

[0172] First, with reference to FIG. 6, the RF channel control method according to the present invention will be described from the perspective of an RF channel control device 100 implemented in an intelligent base station control device (eg, SMO, RIC, etc.).

[0173] According to the RF channel control method of the present invention, the RF channel control device 100 collects information on cells (S10).

[0174] Specifically, in the present invention, each base station device 70 (particularly, O-CU56 or O-DU53) can transmit information regarding the cell of each O-RU 60 connected to it (e.g., uplink / downlink radio resource usage rate, throughput, number of simultaneously connected UEs, UE location and distribution, Mobility, Service Type information, energy consumption and efficiency of O-RU 60, state transition, time information for each state, etc.) to the RF channel control device 100 periodically or continuously at the time of generation.

[0175] Therefore, the RF channel control device 100 can collect information about the cell from each base station device 70 (O-CU 56 / O-DU 53) under its control.

[0176] At this time, information about the cells can be collected from each base station device 70 (O-CU 56 / O-DU 53) via an O1 interface defined between the components of the SMO and O-RAN.

[0177] Therefore, according to the RF channel control method of the present invention, the RF channel control device 100 can generate or update a policy for RF channel control (e.g., application conditions described below, a performance degradation map based on a machine learning model, etc.) based on the collected information (S20).

[0178] Furthermore, according to the RF channel control method of the present invention, RF channel control device 100 can determine whether or not RF channel control is necessary for each cell of each base station device, based on the collected information (S30).

[0179] Therefore, according to the RF channel control method of the present invention, when the RF channel control device 100 determines that RF channel control is necessary for the cell of the O-RU 60 (S30 Yes), it determines the optimal RF channel control technique to be applied to the cell of the O-RU 60 from among a number of RF channel control techniques applicable to the cell of the O-RU 60 using at least one of the performance degradation predicted value and energy consumption reduction predicted value of each technique calculated based on the collected information (S40).

[0180] Hereinafter, with reference to FIG. 7, a configuration for determining an optimal RF channel control technique (a single technique or a combination of two or more techniques) will be specifically described.

[0181] According to the RF channel control method of the present invention, the RF channel control device 100 can calculate a performance degradation prediction value for each of a number of RF channel control techniques using the performance degradation derived from the UE position for each currently simultaneously connected UE based on a performance degradation map that has been pre-learned for each position in a 3D grid, showing the performance degradation when each RF channel control technique is applied compared to when the RF channel control technique is not applied (S42).

[0182] That is, the RF channel control device 100 calculates the performance degradation (

number

number

number

number

[0183] Then, according to the RF channel control method of the present invention, the RF channel control device 100 selects, from among a number of RF channel control techniques, an RF channel control technique whose previously calculated performance degradation predicted value is within a predefined tolerance range (S44).

[0184] In other words, assuming that the predefined tolerance range is 20% performance degradation, the RF channel control device 100 calculates a predicted performance degradation value when multiple RF channel control techniques (e.g., first, second, and third techniques) are applied based on the collected information using the above-mentioned Equation 1 or 2. If the first, second, and third RF channel control techniques are 10%, 25%, and 5%, respectively, the RF channel control device 100 can select the first and third RF channel control techniques (S44).

[0185] According to the RF channel control method of the present invention, the RF channel control device 100 can determine an optimal RF channel control technique (a single technique or a combination of two or more techniques) from among the RF channel control techniques selected in step S44 based on the energy consumption reduction predicted value calculated by the above-mentioned Equation 3 (S46, S48).

[0186] For example, assuming that the first and third RF channel control techniques are selected based on the calculated performance degradation prediction value being within the allowable range of 20% as described above, the RF channel control device 100 calculates the energy consumption increase value (Energy Consumption Increase (ECI)) for each of the first RF channel control technique, the third RF channel control technique, and the combination of the first and third RF channel control techniques according to the above-mentioned Equation 3. Performance degradation ) can be calculated (see Equation 4) and used to calculate the predicted energy consumption savings (S46, see Equation 5).

[0187] Then, based on the predicted energy consumption reduction values calculated for the RF channel control first technique, third technique, and the combination of the first and third techniques respectively, the RF channel control device 100 can determine at least one RF channel control technique (the first technique, the third technique, or the combination of the first and third techniques) with the maximum predicted energy consumption reduction value as the optimal RF channel control technique (S48).

[0188] Referring back to FIG. 6 and continuing the description, according to the RF channel control method of the present invention, once the RF channel control device 100 determines the optimal RF channel control technique (single or combination of two or more) to be applied to the cell of the O-RU 60 in step S40, it can transmit a control command for applying the determined RF channel control technique to the O-RU 60 of the corresponding cell (S50).

[0189] For example, the RF channel control device 100 can transmit the above control command to the O-DU 53 connected to the O-RU 60 via the O1 interface, or transmit the above control command to the O-CU 56 that controls the O-DU 53 connected to the O-RU 60 so that the control command is transmitted to the O-DU 53 by the O-CU 56 (S50).

[0190] In this way, the base station module 50 (O-CU 56 / O-DU 53) that receives the transmission of the control command via the O1 interface can transmit the control command to the radio device 60 (O-RU 60) of the corresponding cell in a manner of controlling it according to the received control command (S50).

[0191] At this time, the control by the control command can be performed / transmitted via the interface defined in the O-RAN Fronthaul, that is, the Open Fronthaul M-Plane.

[0192] Therefore, according to the present invention, the O-RU 60 performs an operation of reconfiguring the RF channel of a corresponding cell according to a control command from the RF channel controller 100, and can generate the operation result (S60).

[0193] The operation result generated in this manner is reported from the O-RU 60 to the base station module 50 (O-CU56 / O-DU53) via the open fronthaul M-Plane, and the RF channel control application status reflecting the reported operation result can be reported from the base station module 50 (O-CU56 / O-DU53) to the RF channel control device 100 via the O1 interface (S70).

[0194] As described above, according to the RF channel control method of the present invention, the RF channel control device 100 can optimally control / reconfigure RF channels for cells requiring RF channel control by repeating the above-mentioned steps every time the collected information is updated, or at every policy update period, or at every separately set period, unless the RF channel control function of the present invention is turned off (S80 No).

[0195] As can be seen from the above description, according to the present invention, in an O-RAN system based on multi-vendor base station equipment, a specific configuration is realized for dynamically / optimally controlling RF channels taking into consideration both cell throughput and energy saving, and interface operation between related O-RAN equipment is realized.

[0196] As a result, according to the present invention, by utilizing the structure in which an intelligent base station control device (e.g., SMO, RIC, etc.) is introduced in the O-RAN system, it is possible to obtain the effect of dynamically / optimally controlling the RF channel of a cell according to the situation.

[0197] The RF channel control method according to an embodiment of the present invention may be embodied in the form of program instructions executable by various computer means and recorded on a computer readable medium. The computer readable medium may include program instructions, data files, data structures, and the like, alone or in combination. The program instructions recorded on the medium may be those specially designed and constructed for the present invention, or may be those known and available to those skilled in the art of computer software. Examples of computer readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tapes, optical media such as CD-ROMs and DVDs, magneto-optical media such as floptical disks, and hardware devices specially configured to store and execute program instructions, such as ROMs, RAMs, flash memories, and the like. Examples of program instructions include high-level language codes that can be executed by a computer using an interpreter, as well as machine language codes such as those produced by a compiler. The hardware devices may be configured to operate as one or more software modules to perform the operations of the present invention, and vice versa.

[0198] Although the present invention has been described in detail above with reference to preferred embodiments, the present invention is not limited to the above embodiments, and it can be said that the technical concept of the present invention extends to the extent that anyone having ordinary knowledge in the technical field to which the present invention pertains can make various modifications or alterations without departing from the gist of the present invention as claimed in the following claims.

Claims

1. In an RF channel control device for an O-RAN (Open RAN (Radio Access Network)) system, An information collecting unit that collects information regarding a cell; and A control unit that determines an RF channel control technique to be applied to the cell using a specific value determined based on the collected information from among a number of RF channel control techniques applicable to the cell; The control unit is calculating a predicted performance degradation and a predicted energy consumption savings for each of the plurality of RF channel control techniques based on the collected information; An RF channel control device comprising: a first RF channel control technique that determines, from among RF channel control techniques whose calculated predicted performance degradation values ​​are within a predefined range, at least one RF channel control technique based on a predicted energy consumption reduction value.

2. The above specific values ​​are 2. The RF channel control device of claim 1, further comprising at least one of a performance degradation prediction value for each technique calculated based on the collected information, a predicted energy consumption reduction value, and a cell status value determined based on the collected information.

3. The collected information for the above cells is The RF channel control device of claim 1, further comprising at least one of uplink and downlink radio resource usage rates for the cell, throughput, number of simultaneously connected UEs, UE location and distribution, mobility, service type information, energy consumption and efficiency, state transition, and time information for each state.

4. The control unit is determining at least one RF channel control technique that satisfies application conditions including at least one combination of a first condition whether a predetermined RF channel control technique application time period is in progress, a second condition whether a network load is equal to or lower than a predetermined load threshold, a third condition whether an energy consumption reduction predicted value is equal to or higher than a predetermined reduction threshold, and a fourth condition whether a performance degradation predicted value is equal to or lower than a predetermined degradation threshold; 3. The RF channel control device of claim 2, further comprising: transmitting a control command for applying the determined RF channel control technique to a Radio Unit (RU) of the cell, so that the RU reconfigures an RF channel according to the control command.

5. The above-mentioned numerous RF channel control techniques include: A technique for turning off or on some Tx / Rx arrays in a pattern that reflects UE locations and distribution among Tx / Rx arrays configured in the RUs of the cell; A technique for decreasing or increasing Tx power in the RUs of said cell; 3. The RF channel control device as claimed in claim 2, further comprising a technique for reducing or restoring the number of transmissions of a specific signal that is periodically transmitted (always-on signal).

6. The expected performance degradation for each of the multiple RF channel control techniques is: The RF channel control device of claim 2, characterized in that the performance degradation when each RF channel control technique is applied compared to when the RF channel control technique is not applied is calculated using the performance degradation derived from the UE position for each simultaneously connected UE based on a performance degradation map pre-learned for each position in a 3D grid.

7. The controller determines at least one RF channel control technique that maximizes a predicted energy consumption reduction value from among the RF channel control techniques; The calculated projected energy consumption savings for the at least one RF channel control technique is: The RF channel control device of claim 2, wherein the energy consumption is calculated using an energy consumption reduction value when the at least one RF channel control technique is applied and an energy consumption increase value that is increased by applying the at least one RF channel control technique.

8. The above energy consumption increase value is The RF channel control device of claim 7, wherein the energy consumption reduction value when the at least one RF channel control technique is applied is subtracted from the energy consumption reduction value when the at least one RF channel control technique is applied, and the calculated value reflects a predicted performance degradation value calculated for the at least one RF channel control technique.

9. A distributed unit (DU) for an O-RAN (Open RAN (Radio Access Network)) system, comprising: The DU includes a function of transmitting a control command based on collected information for a cell controlled by the DU to a radio unit (RU) of the cell, so that the RU reconfigures an RF channel of the cell according to the control command; The control command is: a command to apply an RF channel control technique determined using a specific value determined based on the collected information from among a number of RF channel control techniques applicable to the cell; A performance degradation prediction value and an energy consumption reduction prediction value for each of the plurality of RF channel control techniques are calculated based on the collected information, and at least one RF channel control technique to be applied by the control command is determined based on the energy consumption reduction prediction value from among the RF channel control techniques whose calculated performance degradation prediction values ​​are within a predefined range. A distribution unit comprising:

10. A radio unit (Radio Unit, RU) for an O-RAN (Open RAN (Radio Access Network)) system, the radio unit forming a cell, when receiving a control command communicated based on collected information for the cell, reconfiguring an RF channel of the cell according to the control command; The control command is: a command to apply an RF channel control technique determined using a specific value determined based on the collected information from among a number of RF channel control techniques applicable to the cell; A performance degradation prediction value and an energy consumption reduction prediction value for each of the plurality of RF channel control techniques are calculated based on the collected information, and at least one RF channel control technique to be applied by the control command is determined based on the energy consumption reduction prediction value from among the RF channel control techniques whose calculated performance degradation prediction values ​​are within a predefined range.

1. A wireless device comprising:

11. An RF channel control method for an RF channel control device for an O-RAN (Open RAN (Radio Access Network)) system, comprising: An information collection step of collecting information about a cell; and A technique determination step of determining an RF channel control technique to be applied to the cell using a specific value determined based on the collected information from among a number of RF channel control techniques applicable to the cell; The technique decision stage is as follows: calculating a predicted performance degradation and a predicted energy consumption savings for each of the plurality of RF channel control techniques based on the collected information; An RF channel control method for an RF channel control device, comprising determining at least one RF channel control technique based on a predicted energy consumption reduction value from among RF channel control techniques whose calculated predicted performance degradation value is within a predefined range.

12. The above specific values ​​are The RF channel control method of claim 11, further comprising at least one of a performance degradation prediction value of each technique calculated based on the collected information, a predicted energy consumption reduction value, and a cell status value determined based on the collected information.

13. The technique decision stage is as follows: determining at least one RF channel control technique that satisfies application conditions including at least one combination of a first condition whether a predetermined RF channel control technique application time period is in progress, a second condition whether a network load is equal to or lower than a predetermined load threshold, a third condition whether an energy consumption reduction predicted value is equal to or higher than a predetermined reduction threshold, and a fourth condition whether a performance degradation predicted value is equal to or lower than a predetermined degradation threshold; The RF channel control method of claim 12, further comprising transmitting a control command for applying the determined RF channel control technique to a Radio Unit (RU) of the cell, and causing the RU to reconfigure an RF channel according to the control command.

14. The expected performance degradation for each of the multiple RF channel control techniques is: The RF channel control method of claim 12, characterized in that the performance degradation when each RF channel control technique is applied compared to when the RF channel control technique is not applied is calculated using the performance degradation derived from the UE position for each simultaneously connected UE based on a performance degradation map pre-learned for each position in a 3D grid.

15. The technique determining step includes determining at least one RF channel control technique that maximizes a predicted energy consumption reduction value from among the RF channel control techniques; The calculated projected energy consumption savings for the at least one RF channel control technique is: The RF channel control method of claim 12, wherein the energy consumption is calculated using an energy consumption reduction value when the at least one RF channel control technique is applied and an energy consumption increase value that is increased by applying the at least one RF channel control technique.

16. The above energy consumption increase value is The RF channel control method of claim 15, characterized in that the energy consumption reduction value when the at least one RF channel control technique is applied is subtracted from the energy consumption when the RF channel control technique is not applied, and the calculated value reflects the predicted performance degradation value calculated for the at least one RF channel control technique.

17. A method for RF channel control performed in a distributed unit (DU) for an O-RAN (Open RAN (Radio Access Network)) system, comprising: The method includes transmitting a control command based on the collected information for a cell controlled by the DU to a radio unit (RU) of the cell, so that the RU reconfigures an RF channel of the cell according to the control command; The control command is: a command to apply an RF channel control technique determined using a specific value determined based on the collected information from among a number of RF channel control techniques applicable to the cell; A performance degradation prediction value and an energy consumption reduction prediction value for each of the plurality of RF channel control techniques are calculated based on the collected information, and at least one RF channel control technique to be applied by the control command is determined based on the energy consumption reduction prediction value from among the RF channel control techniques whose calculated performance degradation prediction values ​​are within a predefined range.

13. An RF channel control method comprising:

18. An RF channel control method performed in a radio unit (Radio Unit, RU) for an O-RAN (Open RAN (Radio Access Network)) system, the radio unit forms a cell, and the RF channel control method includes: when receiving a control command communicated based on collected information for the cell, reconfiguring an RF channel of the cell according to the control command; The control command is: a command to apply an RF channel control technique determined using a specific value determined based on the collected information from among a number of RF channel control techniques applicable to the cell; A performance degradation prediction value and an energy consumption reduction prediction value for each of the plurality of RF channel control techniques are calculated based on the collected information, and at least one RF channel control technique to be applied by the control command is determined based on the energy consumption reduction prediction value from among the RF channel control techniques whose calculated performance degradation prediction values ​​are within a predefined range.

13. An RF channel control method comprising:

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