Method and apparatus for changing reception mode in wireless communication system

Abstract

A method performed by a first distributed unit (DU) in a wireless communication system, according to one embodiment of the present disclosure, comprises the steps of: identifying a performance anomaly of the first DU; determining, on the basis of the identification, a second DU to which a terminal signal control request is to be transmitted; on the basis of the determination result, transmitting the terminal signal control request to the second DU or reporting the performance anomaly to a central unit; transmitting, to the first group of terminals, control information for controlling the transmission strength of a first group of terminals corresponding to the first DU; receiving a data signal from the first group of terminals; receiving an interference signal from a second group of terminals corresponding to the second DU; and determining a reception mode on the basis of the data signal and the interference signal.

Description

Method and device for changing the reception mode in a wireless communication system

[0001] The present disclosure relates to a method and device for changing a reception mode in a wireless communication system, and relates to a method and device capable of changing to an appropriate reception mode according to a signal reception environment and performance conditions of a device.

[0002] Looking back at the evolution of wireless communication over successive generations, technologies have primarily been developed for human-facing services such as voice, multimedia, and data. With the commercialization of the 5G (5th Generation) communication system, an explosive increase in connected devices is expected to be connected to communication networks. Examples of networked objects include vehicles, robots, drones, home appliances, displays, smart sensors installed in various infrastructures, construction equipment, and factory equipment. Mobile devices are also expected to evolve into diverse form factors, such as augmented reality glasses, virtual reality headsets, and holographic devices. In the 6G (6th Generation) era, efforts are being made to develop improved 6G communication systems to connect hundreds of billions of devices and objects and provide diverse services. For this reason, 6G communication systems are often referred to as "beyond 5G."

[0003] The 6G communication system, expected to be realized around 2030, will have a maximum transmission speed of terabytes (i.e., 1,000 gigabits) per second (bps) and a wireless latency of 100 microseconds (μsec). In other words, compared to 5G, the transmission speed in a 6G communication system will be 50 times faster and the wireless latency will be reduced to one-tenth.

[0004] To achieve these high data rates and ultra-low latency, 6G communication systems are being considered for implementation in the terahertz (THz) band (e.g., from 95 gigahertz (GHz) to 3 terahertz (THz)). Compared to the millimeter wave (mmWave) band introduced in 5G, the terahertz band is expected to have more severe path loss and atmospheric absorption, making it more important to develop technologies that can guarantee signal reach, or coverage. Key technologies to ensure coverage include Radio Frequency (RF) components, antennas, new waveforms that offer better coverage than Orthogonal Frequency Division Multiplexing (OFDM), beamforming, and multiple antenna transmission technologies such as massive Multiple-Input and Multiple-Output (MIMO), Full Dimensional MIMO (FD-MIMO), array antennas, and large-scale antennas. In addition, new technologies such as metamaterial-based lenses and antennas, high-dimensional spatial multiplexing using Orbital Angular Momentum (OAM), and Reconfigurable Intelligent Surface (RIS) are being discussed to improve the coverage of terahertz band signals.

[0005] In addition, in order to improve frequency efficiency and system network, 6G communication systems are developing full duplex technology that utilizes the same frequency resources at the same time for uplink and downlink; network technology that integrates satellites and HAPS (High-Altitude Platform Stations); network structure innovation technology that supports mobile base stations and enables optimization and automation of network operation; dynamic spectrum sharing technology through collision avoidance based on spectrum usage prediction; AI-based communication technology that utilizes AI (Artificial Intelligence) from the design stage and internalizes end-to-end AI support functions to realize system optimization; and next-generation distributed computing technology that realizes services with complexity that exceeds the limits of terminal computing capabilities by utilizing ultra-high-performance communication and computing resources (Mobile Edge Computing (MEC), cloud, etc.). In addition, efforts are being made to further strengthen connectivity between devices, further optimize networks, promote softwareization of network entities, and increase the openness of wireless communications through the design of new protocols to be used in 6G communication systems, the implementation of hardware-based security environments, the development of mechanisms for the safe use of data, and the development of technologies for maintaining privacy.

[0006] Research and development of these 6G communication systems are expected to enable a new level of hyper-connected experience through the hyper-connectivity of 6G communication systems, which encompass not only connections between things but also connections between people and things. Specifically, 6G communication systems are expected to enable services such as truly immersive eXtended Reality (XR), high-fidelity mobile holograms, and digital replicas. Furthermore, services such as remote surgery, industrial automation, and emergency response, which are provided through 6G communication systems through enhanced security and reliability, will be applied in diverse fields such as industry, medicine, automobiles, and home appliances.

[0007] The embodiments of the present disclosure aim to provide a method and device capable of appropriately changing a reception mode according to a signal reception environment and performance conditions of a device.

[0008] According to one embodiment of the present disclosure, a method is performed by a first distributed unit (DU) in a wireless communication system, comprising: a step of confirming a performance abnormality of the first distributed unit; a step of determining a second distributed unit to which a terminal signal control request is to be transmitted based on the confirmation; a step of transmitting a terminal signal control request to the second distributed unit or reporting the performance abnormality to a central unit based on a result of the determination; a step of transmitting control information for controlling transmission strength of terminals of a first group corresponding to the first distributed unit to the terminals of the first group; a step of receiving a data signal from the terminals of the first group; a step of receiving an interference signal from the terminals of the second group corresponding to the second distributed unit; and a step of determining a reception mode based on the data signal and the interference signal.

[0009] According to one embodiment of the present disclosure, a device is a first distributed unit (DU) of a wireless communication system, comprising a transceiver and a processor connected to the transceiver, wherein the processor is configured to perform the following operations: confirming a performance abnormality of the first distributed unit; determining a second distributed unit to which a terminal signal control request is to be transmitted based on the confirmation; transmitting the terminal signal control request to the second distributed unit or reporting the performance abnormality to a central unit based on a result of the determination; transmitting control information for controlling transmission strength of terminals of a first group corresponding to the first distributed unit to the terminals of the first group; receiving a data signal from the terminals of the first group; receiving an interference signal from the terminals of the second group corresponding to the second distributed unit; and determining a reception mode based on the data signal and the interference signal.

[0010] A method according to one embodiment of the present disclosure is a method performed by a second distributed unit (DU) in a wireless communication system, comprising the steps of: receiving a terminal signal control request from a first distributed unit; transmitting a response to the terminal signal control request to the first distributed unit; transmitting control information for controlling transmission strength of terminals of a second group corresponding to the second distributed unit to the terminals of the second group; receiving a data signal from the terminals of the second group; receiving an interference signal from the terminals of the first group corresponding to the first distributed unit; and determining a reception mode based on the data signal and the interference signal.

[0011] According to one embodiment of the present disclosure, a device is provided as a method performed by a central unit (CU) in a wireless communication system, comprising the steps of: receiving a performance abnormality report from a first distributed unit (DU); determining a second distributed unit to which a terminal signal control request is to be transmitted based on the performance abnormality report; transmitting, to the first distributed unit, first configuration information for controlling transmission strength of a first group of terminals corresponding to the first distributed unit; and transmitting, to the second distributed unit, second configuration information for controlling transmission strength of a second group of terminals corresponding to the second distributed unit, wherein the step of determining the second distributed unit is based on information about a computational capability of the second distributed unit and information about a frequency domain resource related to the second distributed unit.

[0012] A method and device according to one embodiment of the present disclosure can improve the reception quality of a base station by changing to a reception mode suitable for the performance and reception environment of a device in a wireless communication system.

[0013] The effects that can be obtained from the present disclosure are not limited to the effects mentioned above, and other effects that are not mentioned can be clearly understood by a person having ordinary skill in the art to which the present disclosure belongs from the description below.

[0014] The features and advantages of one embodiment of the present disclosure will become more apparent from the following description taken in conjunction with the accompanying drawings.

[0015] FIG. 1 illustrates a wireless communication system according to one embodiment of the present disclosure.

[0016] Figure 2 is a drawing for explaining the structure of a terminal according to one embodiment.

[0017] FIG. 3 is a drawing for explaining the structure of a base station according to one embodiment.

[0018] FIG. 4 is a drawing for explaining a method for changing a reception mode according to one embodiment of the present disclosure.

[0019] FIG. 5 is a drawing for explaining a method for changing a reception mode according to one embodiment of the present disclosure.

[0020] FIG. 6 is a diagram for explaining an appropriate reception mode according to an interference signal ratio and SINR according to one embodiment of the present disclosure.

[0021] FIG. 7 is a diagram for explaining a DU (Distributed Unit) whose reception mode has been changed according to one embodiment of the present disclosure.

[0022] FIG. 8 is a drawing for explaining a DU whose reception mode has been changed according to one embodiment of the present disclosure.

[0023] FIG. 9 is a drawing for explaining a method for changing a reception mode according to one embodiment of the present disclosure.

[0024] FIG. 10 is a drawing for explaining a method for changing a reception mode according to one embodiment of the present disclosure.

[0025] FIG. 11 is a drawing for explaining a method for changing a reception mode according to one embodiment of the present disclosure.

[0026] FIG. 12 is a drawing for explaining a method for changing a reception mode according to one embodiment of the present disclosure.

[0027] FIG. 13 is a drawing for explaining a method for changing a reception mode according to one embodiment of the present disclosure.

[0028] FIG. 14 is a drawing for explaining a method for changing the reception mode of a first DU according to one embodiment of the present disclosure.

[0029] FIG. 15 is a diagram for explaining a terminal signal control request transmission operation of a first DU according to one embodiment of the present disclosure.

[0030] FIG. 16 is a drawing for explaining a method for changing the reception mode of a second DU according to one embodiment of the present disclosure.

[0031] FIG. 17 is a drawing for explaining the judgment operation of the second DU according to one embodiment of the present disclosure.

[0032] FIG. 18 is a diagram for explaining the operation of a CU (Central Unit) according to one embodiment of the present disclosure.

[0033] Embodiments of the present disclosure may address the problems and / or disadvantages described above and provide the advantages described below. One aspect of the present disclosure may provide a network entity (or node) and a communication method thereof in a wireless communication system.

[0034] The terms used in this disclosure are used only to describe specific embodiments and may not be intended to limit the scope of other embodiments. The singular expression may include plural expressions unless the context clearly indicates otherwise. Terms used herein, including technical or scientific terms, may have the same meaning as commonly understood by those of ordinary skill in the art described in this disclosure. Terms defined in general dictionaries among the terms used in this disclosure may be interpreted as having the same or similar meaning in the context of the relevant technology, and shall not be interpreted in an idealized or overly formal sense unless explicitly defined in this disclosure. In some cases, even if a term is defined in this disclosure, it cannot be interpreted to exclude embodiments of the present disclosure.

[0035] The various embodiments of the present disclosure described below illustrate hardware-based approaches. However, since the various embodiments of the present disclosure encompass techniques utilizing both hardware and software, the various embodiments of the present disclosure do not exclude software-based approaches.

[0036] Additionally, although various embodiments of the present disclosure describe various embodiments using terminology used in certain communication standards (e.g., 3rd generation partnership project (3GPP)), this is merely an example for illustrative purposes. Various embodiments of the present disclosure can be easily modified and applied to other communication systems.

[0037] Hereinafter, various embodiments of the present disclosure will be described.

[0038] FIG. 1 illustrates a wireless communication system according to one embodiment of the present disclosure.

[0039] FIG. 1 illustrates some of the nodes utilizing a wireless channel in a wireless communication system, including a base station (110), a first terminal (120), and / or a second terminal (130). Although FIG. 1 illustrates only one base station, this is merely an example. The wireless communication system of FIG. 1 may further include other base stations identical or similar to the base station (110).

[0040] The base station (110) is a network infrastructure that provides wireless access to terminals (120, 130). The base station (110) has coverage defined as a certain geographical area based on the distance at which a signal can be transmitted. In addition to the base station, the base station (110) may be referred to as an 'access point (AP)', 'eNodeB (eNB)', 'gNodeB (gNB)', '5G node (5th generation node)', 'wireless point', 'transmission / reception point (TRP)', or other terms having equivalent technical meanings.

[0041] The first terminal (120) and the second terminal (130) are each devices used by a user and can communicate with the base station (110) via a wireless channel. At least one of the first terminal (120) or the second terminal (130) can be operated without the user's intervention. For example, at least one of the first terminal (120) or the second terminal (130) may be a device that performs machine type communication (MTC) and may not be carried by the user. Each of the first terminal (120) and the second terminal (130) may be referred to as a terminal, or other terms having equivalent technical meanings, such as 'user equipment (UE),' 'mobile station,' 'subscriber station,' 'customer premises equipment (CPE),' 'remote terminal,' 'wireless terminal,' 'electronic device,' or 'user device.'

[0042] The base station (110), the first terminal (120), and the second terminal (130) can transmit and / or receive wireless signals in the millimeter wave (mmWave) band (e.g., 28 GHz, 30 GHz, 38 GHz, 60 GHz). At this time, in order to improve channel gain, the base station (110), the first terminal (120), and / or the second terminal (130) can perform beamforming.

[0043] Beamforming may include transmit beamforming and / or receive beamforming. That is, the base station (110), the first terminal (120), and / or the second terminal (130) may impart directionality to the transmit signal or the receive signal. To impart directionality to the receive signal, the base station (110) and / or the terminals (120, 130) may select serving beams (112, 113, 121, 131) through a beam search or beam management procedure. After the serving beams (112, 113, 121, 131) are selected, subsequent communication may be performed through resources that are in a quasi-co-located (QCL) relationship with the resources that transmitted the serving beams (112, 113, 121, 131).

[0044] The base station (110), the first terminal (120), and the second terminal (130) of the present disclosure may each be a transmitting apparatus, a transmitting node, a receiving apparatus, and / or a receiving node. For example, the base station (110) may transmit an RF (radio frequency) signal to the first terminal (120). The base station (110) may receive the RF signal from the first terminal (120). As another example, the first terminal (120) may transmit an RF signal to the base station (110) or the second terminal (130). The first terminal (120) may receive the RF signal from the base station (110) or the second terminal (130).

[0045] Figure 2 is a drawing for explaining the structure of a terminal according to one embodiment.

[0046] Referring to FIG. 2, a terminal (200) according to one embodiment may include a transceiver (210), a memory (220), and / or a processor (230). Although the terminal (200) is described in the present disclosure as including a transceiver (210), a memory (220), and / or a processor (230), this is merely an example. For example, the terminal (200) may further include other components in addition to the transceiver (210), the memory (220), and the processor (230).

[0047] According to one embodiment, the transceiver (210), memory (220), and processor (230) may be implemented or formed as separate chips. However, this is merely an example, and the transceiver (210), memory (220), and / or processor (230) may be implemented or formed as a single chip.

[0048] According to one embodiment, the transceiver (210) may include at least one transmitter and / or at least one receiver. For example, the transceiver (210) may include an RF transmitter for amplifying and up-converting the frequency of a transmitted signal. The transceiver (210) may include an RF receiver for down-converting the frequency of a received signal and amplifying low-noise.

[0049] The configurations of the transceiver (210) described in the present disclosure are merely examples, and the configuration of the transceiver (210) is not limited to an RF transmitter and an RF receiver. For example, the transceiver (210) may further include a coupler to ensure isolation between the RF transmitter and the RF receiver.

[0050] In one embodiment, the transceiver (210) may transmit or receive signals to the processor (230). For example, the transceiver (210) may transmit or deliver an RF signal received via a wireless communication channel to the processor (230). The transceiver (210) may receive or deliver an RF signal from the processor (230).

[0051] In one embodiment, the transceiver (210) may be referred to as a UE transmitter or a UE receiver.

[0052] According to one embodiment, the transceiver (210) may transmit signals to or receive signals from a base station (e.g., base station (110) of FIG. 1) or a network entity (e.g., access and mobility management function (AMF) entity). In one embodiment, the transmitted or received signals may include control signals and data.

[0053] According to one embodiment, the memory (220) may include or store programs and data necessary for the operations of the terminal (200). For example, the memory (220) may be a non-transitory memory, and a program stored in the non-transitory memory may be organically combined with a hardware configuration of the terminal (200) (e.g., a processor (230) or a transceiver (210)). The memory (220) may store control information or data including a signal acquired by the terminal (200). In one embodiment, the memory (220) may include a read-only memory (ROM), a random access memory (RAM), a hard disk, a CD-ROM, a DVD, and / or a storage medium.

[0054] According to one embodiment, the processor (230) may include one processor or multiple processors. For example, the processor (230) may include a communication processor. For example, the processor (230) may include a communication processor and / or an application processor.

[0055] In one embodiment, the processor (230) may control a series of processes performed by the terminal (200). For example, the transceiver (210) may receive a data signal including control information transmitted by a base station or network entity. The processor (230) may process the received control signal and data signal.

[0056] The term "processor" in the present disclosure may be replaced with various terms referring to a configuration that executes or performs operations of the terminal (200). For example, the term "processor" may be replaced with a controller or a computing circuit.

[0057] The terminal (200) of the present disclosure may correspond to the first terminal (120) and / or the second terminal (130) of FIG. 1.

[0058] FIG. 3 is a drawing for explaining the structure of a base station according to one embodiment.

[0059] Referring to FIG. 3, a base station (300) according to one embodiment may include a transceiver (310), a memory (320), and / or a processor (330). Although the base station (300) is described in the present disclosure as including a transceiver (310), a memory (320), and / or a processor (330), this is merely an example. For example, the base station (300) may further include other components in addition to the transceiver (310), the memory (320), and the processor (330).

[0060] According to one embodiment, the transceiver (310), memory (320), and processor (330) may be implemented or formed as separate chips. However, this is merely an example, and the transceiver (310), memory (320), and / or processor (330) may be implemented or formed as a single chip.

[0061] According to one embodiment, the transceiver (310) may include at least one transmitter and / or at least one receiver. For example, the transceiver (310) may include an RF transmitter for amplifying and up-converting the frequency of a transmitted signal. The transceiver (310) may include an RF receiver for down-converting the frequency of a received signal and amplifying low-noise.

[0062] The configurations of the transceiver (310) described in the present disclosure are merely examples, and the configuration of the transceiver (310) is not limited to an RF transmitter and an RF receiver. For example, the transceiver (310) may further include a coupler to ensure isolation between the RF transmitter and the RF receiver.

[0063] In one embodiment, the transceiver (310) may transmit or receive signals to the processor (330). For example, the transceiver (310) may transmit or deliver an RF signal received via a wireless communication channel to the processor (330). The transceiver (310) may receive or deliver an RF signal from the processor (230).

[0064] In one embodiment, the transceiver (310) may be referred to as a base station transmitter or a base station receiver.

[0065] In one embodiment, the transceiver (310) may transmit a signal to the terminal (200) or receive a signal from the terminal (200). In one embodiment, the transmitted or received signal may include a control signal and data.

[0066] According to one embodiment, the memory (320) may include programs and data necessary for the operations of the base station (300). For example, the memory (320) may be a non-transitory memory, and the program stored in the non-transitory memory may be organically combined with the hardware configuration of the base station (300) (e.g., the processor (330) or the transceiver (310)). The memory (320) may store control information or data including a signal acquired by the base station (300). In one embodiment, the memory (320) may include a read-only memory (ROM), a random access memory (RAM), a hard disk, a CD-ROM, a DVD, and / or a storage medium.

[0067] According to one embodiment, the processor (330) may include one processor or multiple processors. For example, the processor (330) may include a communication processor. For example, the processor (330) may include a communication processor and / or an application processor.

[0068] In one embodiment, the processor (330) may control a series of processes performed by the base station (300). For example, the transceiver (310) may receive a data signal containing control information transmitted by the base station or a network entity. The processor (330) may process the received control signal and data signal.

[0069] The term "processor" in the present disclosure may be replaced with various terms referring to a configuration that executes or performs operations of the base station (300). For example, the term "processor" may be replaced with a controller or a computing unit.

[0070] Meanwhile, base stations can be functionally separated based on data throughput and latency. For example, the baseband unit (BBU) in LTE 4G can be functionally separated into a central unit (CU), a distributed unit (DU), and a radio unit (RU) in 5G.

[0071] A radio unit may be a wireless hardware device that converts radio signals transmitted and received from an antenna into digital signals for transmission over a packet network. The radio unit may be designed with consideration for size, weight, and / or power consumption, and may include beamforming capabilities as well as processing lower PHY layers. It may be deployed on-site to transmit and receive signals.

[0072] The distributed unit and central unit may have different functional allocations depending on the division point used to functionally separate the base station. Various options for separating the distributed and central units can be found in 3GPP (3rd generation partnership project) TS 38.801.

[0073] The wireless unit, distributed unit, and central unit according to embodiments of the present disclosure may be components that are physically or functionally separate from the base station. One central unit may be connected to at least one distributed unit, and the distributed unit may apply a reception technique to detect a signal received from at least one wireless unit. The reception technique may include a reception technique based on MMSE or a reception technique based on MMSE-IRC. However, the present invention is not limited thereto, and various known reception modes may be applied.

[0074] A distributed unit according to embodiments of the present disclosure may include a virtualized distributed unit (vDU). A vDU may represent a distributed unit whose functions are implemented by software on a server physically located remotely from a wireless unit. A vDU may include multiple logically distinct vDUs. Each vDU may process signals received from an associated user terminal group by applying a reception technique.

[0075] Meanwhile, the devices described in FIGS. 2 and 3 may correspond to devices of a transmitter or receiver. A terminal or base station according to an embodiment of the present disclosure may be a transmitter if it is a transmitter, and may be a receiver if it is a receiver.

[0076] The device described in FIG. 3 may correspond to a central unit and / or a distributed unit of a base station. For example, the central unit or distributed unit of the base station may include a transceiver, a processor, and a memory.

[0077] Various embodiments of the present disclosure relate to a signal receiving method and a receiving device. Specifically, the present disclosure may relate to a technique for efficiently selecting a receiving mode during a signal detection process of a distributed unit (DU).

[0078] As a method for detecting a received signal, the reception mode of the multiple antennas may include minimum mean square error (MMSE) and minimum mean square error - interference rejection combining (MMSE-IRC). MMSE and MMSE-IRC are reception modes that apply a linear filter, and have low complexity and excellent signal detection performance compared to non-linear signal detection methods such as a maximum likelihood (ML) detector.

[0079] While MMSE-IRC offers improved signal detection performance compared to MMSE, its computational complexity is high. Specifically, MMSE-IRC's computational complexity is proportional to the cube of the number of Rx ports, making it difficult to apply in wireless communication networks with more than 256 Rx ports. Therefore, receivers may benefit from adopting the MMSE technique if it can achieve good detection performance with its low computational complexity.

[0080] Below, FIGS. 4 to 6 describe a method for selecting an MMSE reception mode or an MMSE-IRC reception mode at a receiving end.

[0081] FIG. 4 is a drawing for explaining a method for changing a reception mode according to one embodiment of the present disclosure.

[0082] Referring to FIG. 4, a base station (or distributed unit) can determine a reception mode based on a value estimated from a received signal.

[0083] The 410 operation represents an operation in which the receiver performs channel estimation based on the DMRS (Demodulation Reference Signal) from the received signal.

[0084] The 420 operation may represent an operation in which the receiver estimates the status of interference signals and noise signals from the received signal.

[0085] The 430 operation may represent an operation in which the receiver estimates the ratio of the interference signal based on the estimated interference signal and noise signal.

[0086] Operation 440 represents an operation in which the receiver compares the estimated interference signal ratio with a threshold value to determine whether a condition is satisfied. The receiver can apply a different reception mode based on the comparison result between the estimated interference signal ratio and the threshold value. For example, the receiver can determine whether the estimated interference signal satisfies a condition in which the ratio is greater than a predefined threshold value. The threshold value can be set in advance through experiments, etc., to determine a more advantageous reception mode at a given interference signal ratio.

[0087] The 452 operation represents an operation in which the receiver applies the MMSE reception mode when the condition that the estimated interference signal ratio is greater than the threshold value is satisfied.

[0088] The 454 operation indicates that the receiver applies the MMSE-IRC reception mode when the condition that the estimated interference signal ratio is greater than the threshold value is not satisfied.

[0089] In the embodiment of FIG. 4, the receiver can apply either the MMSE reception mode or the MMSE-IRC reception mode depending on the estimated quality of the received signal and interference information. For example, the receiver can apply the MMSE reception technique in situations where the interference signal is not obvious, and the MMSE-IRC technique in situations where the interference signal is obvious. Therefore, the receiver can reduce the amount of computation and delay time required for signal detection by applying the appropriate reception mode depending on the situation.

[0090] FIG. 5 is a drawing for explaining a method for changing a reception mode according to one embodiment of the present disclosure.

[0091] In the embodiment of FIG. 5, the receiver can compare the SINR (Signal to interference plus noise ratio) and the interference signal ratio with threshold values, respectively, and determine the reception mode based on the results.

[0092] The 510 operation may represent an operation in which the receiver generates estimated channel state information and interference signal information from a received signal.

[0093] Operation 520 represents an operation in which the receiver compares the generated SINR and interference signal ratio with threshold values, respectively, to determine whether a specific condition is satisfied. The specific condition may be a condition in which the SINR is greater than A and the interference signal ratio is greater than B. In this case, if the generated SINR and interference signal ratio satisfy the condition, the receiver can apply the MMSE reception mode (Operation 532), and if the generated SINR and interference signal ratio do not satisfy the condition (Operation 534), the receiver can apply the MMSE-IRC reception mode.

[0094] In the embodiment of FIG. 4, the receiver can apply the MMSE reception mode or the MMSE-IRC reception mode depending on the SINR and interference signal ratio. The conditions for applying the MMSE reception mode or the MMSE-IRC reception mode can be experimentally determined. For example, through experiments on applying MMSE or MMSE-IRC depending on the SINR and interference signal ratio, a reception mode with better performance between MMSE and MMSE-IRC can be discovered under specific conditions, and through such experiments, specific conditions having critical significance can be derived.

[0095] FIG. 6 is a diagram for explaining an appropriate reception mode according to an interference signal ratio and SINR according to one embodiment of the present disclosure.

[0096] Referring to FIG. 6, a graph is shown showing a reception mode with better performance depending on the SINR and interference signal ratio.

[0097] As illustrated in Fig. 6, a region in which the performance of the MMSE-IRC reception mode is superior is derived when the interference signal ratio is 0.2 or higher. When the interference signal ratio is a fixed value, a region in which the MMSE reception mode is more advantageous or a region in which the MMSE-IRC reception mode is more advantageous is illustrated depending on the SINR. Based on these results, a threshold value or condition can be determined in operation 440 of Fig. 4 or operation 520 of Fig. 5.

[0098] Since the MMSE-IRC reception mode performs interference control based on interference information, the accuracy of interference information estimation is crucial. Figure 6 shows which reception mode is more advantageous between MMSE and MMSE-IRC, depending on the interference signal ratio, which represents the ratio of the intensity of the interference signal to the noise, and the signal-to-interference-plus-noise ratio (SINR). Referring to Figure 6, it can be seen that when the interference characteristics are not distinct, the receiver can reduce the amount of computation and improve signal detection performance by applying the MMSE mode.

[0099] The receiver according to embodiments of the present disclosure can further reduce the block error rate by applying an appropriate reception mode based on channel conditions and / or interference signals, and can perform lower computational load compared to the case where only the computationally intensive MMSE-IRC is applied. Therefore, there is an effect of being able to receive signals with good performance without excessively utilizing the computational capacity of the receiver.

[0100] FIG. 7 is a diagram illustrating a distributed unit (DU) whose reception mode has been changed according to one embodiment of the present disclosure.

[0101] The embodiments of FIGS. 4 and 5 set the reception mode based on the channel conditions and interference signals for signals received at each receiving end without the cooperation of other receiving ends. The embodiment of FIG. 7 may be an embodiment that performs a cooperative operation with other receiving ends (e.g., distributed units) to change the reception mode.

[0102] Referring to (a) of FIG. 7, distributed unit 1 (DU1) (710) and distributed unit 2 (DU2) (720) can receive data signals from user terminal group 1 and user terminal group 2, respectively. DU1 (710) receives data signals from user terminal group 1 and interference from user terminal group 2. DU2 (720) receives data signals from user terminal group 2 and interference from user terminal group 1. In addition, DU1 (710) applies reception mode 1, and DU2 (720) applies reception mode 2. DU1 (710) and DU2 (720) can transmit and receive information through an interface between DUs. The interface between DU1 (710) and DU2 (720) may be a directly connected interface. Alternatively, information transmission between DU1 (710) and DU2 (720) may be accomplished through a central unit (CU).

[0103] Referring to (b) of FIG. 7, DU1 (710) and DU2 (720) can cooperatively change reception modes by sharing information with each other through the DU interface. For example, DU1 (710) can change from reception mode 1 to reception mode 2, and DU2 (720) can change from reception mode 2 to reception mode 1.

[0104] In this regard, more details are shown in Fig. 8.

[0105] FIG. 8 is a diagram for explaining a DU (distributed unit) whose reception mode is changed according to one embodiment of the present disclosure.

[0106] Referring to (a) of FIG. 8, distributed unit 1 (DU1) (810) and distributed unit 2 (DU2) (820) can receive data signals from user terminal group 1 and user terminal group 2, respectively. DU1 (810) receives data signals from user terminal group 1 and interference from user terminal group 2. DU2 (820) receives data signals from user terminal group 2 and interference from user terminal group 1. In addition, DU1 (810) applies reception mode 1, and DU2 (820) applies reception mode 2. DU1 (810) and DU2 (820) can transmit and receive information through an interface between DUs. The interface between DU1 (810) and DU2 (820) may be a directly connected interface. Alternatively, information transmission between DU1 (810) and DU2 (820) may be accomplished through a central unit (CU).

[0107] Referring to (a) of FIG. 8, DU1 (810) and DU2 (820) can exchange information with each other. The exchanged information may include measurement information and / or capacity information related to a received signal. The measurement information related to a signal may include information indicating a channel state, interference, and / or noise information. That is, DU1 (810) and DU2 (820) may exchange information measured at each receiving end directly or through a central unit (CU). The capacity information may include information on the computational capability of each receiving end. The capacity information may indicate the computational capability of each receiving end and / or the current computational level compared to the computational capability. Accordingly, the capacity information may indicate whether a delay or error occurs during signal processing at the receiving end. This is because delay and errors may occur when the computational capability of the receiving end is insufficient compared to the amount of computation required for signal processing.

[0108] In one embodiment, DU1 (810) may apply reception mode 1 to process a received signal, and DU2 (820) may apply reception mode 2 to process the received signal. DU1 (810) may receive a data signal from user terminal group 1 and an interference signal from user terminal group 2. At this time, if the interference signal is relatively distinct compared to the data signal, DU1 (810) may apply an MMSE-IRC based reception mode to secure detection performance of the received signal. DU2 (820) may receive a data signal from user terminal group 2 and an interference signal from user terminal group 1. In the case of DU2 (820), since the interference signal is not distinct, DU2 (820) may apply an MMSE based reception mode to detect the signal. In the case of the MMSE-IRC based reception mode, since the computational complexity is high, there is a possibility that a capacity shortage problem may occur in DU1 (820). On the other hand, since the computational complexity is relatively low in the MMSE-based reception mode, there may be room in the capacity of DU2 (810). In this case, DU1 (810) and DU2 (820) can change the reception mode through mutual cooperation. In conclusion, the transmission signal strength of user terminal group 1 is strengthened and the transmission signal strength of user terminal group 2 is maintained or weakened through the cooperation between DU1 (810) and DU2 (820). Therefore, DU1 (810) can detect a signal in the MMSE-based reception mode because the interference in the received signal is reduced, and DU2 (820) can detect a signal in the MMSE-IRC-based reception mode because the interference in the received signal is increased. In the case of DU2 (820), since there is room in the capacity, the capacity shortage problem may not occur even if the MMSE-IRC-based reception mode is applied.

[0109] FIG. 8 (a) illustrates a situation in which capacity is insufficient due to a high delay time occurring when DU1 (810) continuously applies the MMSE-IRC-based reception mode. That is, when high interference is estimated when measuring the interference intensity of the received signal in DU1 (810), the number of user equipment (UE) that can be serviced within a certain period of time is reduced when DU1 (810) continuously applies the MMSE-IRC reception mode with high computational complexity. DU1 (810) can estimate the required capacity based on the estimated interference intensity and / or the number of times the MMSE-IRC reception mode is applied during a certain period of time, and when the computational capability of DU1 (810) does not meet the requirement, DU1 (810) can cooperate with DU2 (820) that has sufficient computational capability to change the reception mode to the MMSE-based reception mode.

[0110] As shown in (b) of FIG. 8, when there is a DU (e.g., DU2) that can change the reception mode (or has spare capacity), DU1 (810) transmits transmission intensity control information for increasing the transmission intensity to user terminal group 1 so as to reduce interference of the signal received by DU1 (810), and DU2 (820) that can change the reception mode transmits transmission intensity control information for decreasing or maintaining the transmission intensity to user terminal group 2 so as to increase interference of the signal received by DU2 (820). Accordingly, the compensation is changed so that the MMSE-based reception mode is suitable for DU1 (810) and the MMSE-IRC-based reception mode is suitable for DU2 (820). Accordingly, since the MMSE-based reception mode has low computational complexity, the capacity shortage problem of DU1 (810) can be resolved.

[0111] According to embodiments of the present disclosure, performance degradation due to interference information estimation errors at the receiver and capacity shortage problems caused by the continuous application of high-computational complexity reception modes can be resolved. Each receiver can determine whether capacity is insufficient, exchange related information with neighboring receivers, and transmit transmission power control information to an assigned user terminal group to create a situation suitable for the preferred reception mode.

[0112] According to embodiments of the present disclosure, information exchange between receivers (e.g., distributed units, DUs) can be performed via the F1 interface between a central unit (CU) and the distributed units. Furthermore, information exchange can be performed via a direct interface between the distributed units. When information exchange is performed via a direct interface between the distributed units, delay can be minimized to respond to interference that changes in real time. This can be advantageous in cases where user terminals are highly mobile and cell environments frequently change.

[0113] The methods according to embodiments of the present disclosure can also be applied to virtualized distributed units (vDUs), which have high flexibility in utilizing wireless and computational resources. VDUs can collaborate through direct information exchange to flexibly increase cell capacity and improve uplink (UL) performance.

[0114] In the method according to embodiments of the present disclosure, information exchange between distributed units may be possible between distributed units within the same base station, and may also be possible between distributed units corresponding to different base stations. For example, if a first base station includes a first distributed unit and a second base station includes a second distributed unit, the first and second distributed units may exchange information directly or via a central unit.

[0115] FIG. 9 is a drawing for explaining a method for changing a reception mode according to one embodiment of the present disclosure.

[0116] The embodiment of FIG. 9 can illustrate specific operations related to the embodiments of FIGS. 7 and 8.

[0117] Referring to FIG. 9, operation 952 represents an operation in which distributed unit 1 (DU1) (910) receives a data signal from user terminal group 1 (930). At this time, the data signal received by distributed unit 1 (910) may include interference from user terminal group 2 (940). In addition, interference from user terminal groups associated with other distributed units may be further included. Similar to operation 952, distributed unit 2 (DU2) (920) receives a data signal from user terminal group 2 (940), and the data signal received by distributed unit 2 (920) may include interference from user terminal group 1 (930).

[0118] Operation 954 represents an operation in which distributed unit 1 (910) estimates interference based on the data signal received in operation 952. That is, distributed unit 1 (910) can estimate the level of interference based on the signal received in operation 952. Similarly, distributed unit 2 (920) can also estimate the level of interference based on the signal received.

[0119] Operation 956 represents an operation in which distributed unit 1 (910) selects a reception mode based on the interference signal estimated in operation 954. In operation 956, the operation in which distributed unit 1 (910) selects a reception mode based on the interference signal may correspond to any one of the embodiments described in FIGS. 4 to 6. That is, distributed unit 1 (910) may estimate the state of an interference signal or noise, estimate a ratio of an interference signal, and compare the ratio of the interference signal with a preset threshold value to determine a reception mode to apply. In addition, distributed unit 1 (910) may compare the SINR and the ratio of the interference signal with each of the preset threshold values ​​to determine a reception mode to apply. The reception mode may correspond to any one of MMSE or MMSE-IRC. However, the reception mode may correspond to any one of the known reception modes as well as those specified in the present disclosure. Similarly, distributed unit 2 (920) may select a reception mode based on the received signal.

[0120] In one embodiment, a distributed unit according to embodiments of the present disclosure may apply a Fast Fourier Transform (FFT) to a received signal, estimate signal quality and interference information, and then select a receiving mode.

[0121] The 958 operation may indicate an operation of the distributed unit 1 (910) to identify a performance abnormality. The distributed unit 1 (910) may identify a performance abnormality when the computational power required for the service is insufficient or is expected to be insufficient, or when the error rate (e.g., BLER) for the received data is increasing or is expected to increase. Specifically, the distributed unit 1 (910) may determine or predict a current or future performance abnormality by comparing a predefined threshold value with information indicating a current or future state to identify a performance abnormality.

[0122] Operation 960 may represent an operation for exchanging information to cooperate with distributed unit 2 (920) (DU2) when distributed unit 1 (910) identifies a performance abnormality. Distributed unit 1 (910) may request cooperation from distributed unit 2 (920) to resolve the performance abnormality. At this time, the request to distributed unit 2 (920) may be a request to control a signal of user terminal group 2 associated with distributed unit 2 (920). That is, the request to distributed unit 2 (920) includes a signal control request for terminals associated with distributed unit 2 (920). User terminal group 2 (940) associated with distributed unit 2 (920) may include terminals that transmit data signals to distributed unit 2 (920). Operation 960 may include a plurality of transmission and reception operations performed between distributed unit 1 (910) and distributed unit 2 (920). For example, operation 960 may include an operation in which distributed unit 1 (910) sends a request to distributed unit 2 (920) and an operation in which distributed unit 2 (920) receives a response. Alternatively, operation 960 may include an operation in which distributed unit 1 (910) exchanges information (such as scheduling information, interference information, and / or capacity shortage) with distributed unit 2 (920).

[0123] Operation 962 represents an operation in which distributed unit 1 (910) transmits signal strength control information to user terminal group 1 (930). The signal strength control information may include control information for adjusting the transmission strength of terminals included in user terminal group 1 (930). Accordingly, the transmission strength of terminals included in user terminal group 1 (930) may be increased, decreased, or maintained by the signal strength control information.

[0124] Similar to operation 962, distributed unit 2 (920) may transmit signal strength control information to user terminal group 2 (940). The signal strength control information may include control information for adjusting the transmission strength of terminals included in user terminal group 2 (940). Accordingly, the transmission strength of terminals included in user terminal group 2 (940) may be increased, decreased, or maintained by the signal strength control information. In addition, the signal strength control information transmitted by distributed unit 2 (920) may increase, decrease, or maintain the transmission strength of terminals included in user terminal group 2 (940) based on the transmission and reception contents in operation 960. For example, when distributed unit 1 (910) requests distributed unit 2 (920) to lower the transmission strength of user terminal group 2 in operation 960, the signal strength control information transmitted by distributed unit 2 (920) may be control information for reducing the transmission strength of terminals included in user terminal group 2 (940).

[0125] Signal strength control information according to embodiments of the present disclosure may include information indicating an increase, decrease, and maintenance of signal strength as information for controlling signal strength by a terminal, and information on a range within which signal strength can be adjusted.

[0126] In one embodiment, a distributed unit may transmit control information for other purposes, as well as signal strength control information, to a group of user terminals associated with the distributed unit. For example, the distributed unit may transmit control information for changing the precoding method of the terminals to a group of associated user terminals.

[0127] Operation 964 may represent an operation in which terminals included in user terminal group 1 (930) change transmission settings based on signal strength control information received in operation 962. Similarly to operation 964, terminals included in user terminal group 2 (940) may change transmission settings based on signal strength control information received from distributed unit 2 (920).

[0128] Operation 966 may represent an operation in which terminals included in user terminal group 1 (930) transmit data signals to distribution unit 1 (910) with signal strength changed by operation 964. Similarly to operation 966, terminals included in user terminal group 2 (940) may transmit data signals with signal strength changed based on signal strength control information received from distribution unit 2 (920).

[0129] Operation 968 may represent an operation in which distributed unit 1 (910) estimates interference from a signal received in operation 966. At this time, the interference ratio of the signal received by distributed unit 1 (910) may change according to the signal strength of user terminal group 2 (940). For example, when the signal strength of user terminal group 2 (940) increases, the magnitude of interference included in the signal received by distributed unit 1 (910) may increase, and when the signal strength of user terminal group 2 (940) decreases, the magnitude of interference included in the signal received by distributed unit 1 (910) may decrease. Similar to operation 968, distributed unit 2 (920) may estimate interference from a signal received from user terminal group 2 (940).

[0130] Operation 970 represents an operation in which distributed unit 1 (910) selects a reception mode based on the interference signal estimated in operation 968. In operation 968, the operation in which distributed unit 1 (910) selects a reception mode based on the interference signal may correspond to the embodiments described in FIGS. 4 to 6. That is, distributed unit 1 (910) may estimate the state of an interference signal or noise, estimate a ratio of an interference signal, and compare the ratio of the interference signal with a preset threshold value to determine a reception mode to apply. In addition, distributed unit 1 (910) may compare the SINR and the ratio of the interference signal with preset threshold values ​​to determine a reception mode to apply. The reception mode may correspond to either MMSE or MMSE-IRC. However, the reception mode may correspond to any one of the known reception modes as well as those specified in the present disclosure.

[0131] Since the magnitude of the interference signal received by the distributed unit 1 (910) may change in operation 960 to operation 968, the reception mode selected in operation 970 may be different from the reception mode selected in operation 956. Similarly, the distributed unit 2 (920) may apply a reception mode different from the previous reception mode depending on the changed magnitude of the interference signal.

[0132] According to the embodiment of FIG. 9, the intensity of the interference signal received by distributed unit 1 (910) can be adjusted through cooperation with distributed unit 1 (910) and distributed unit 2 (920), and accordingly, a different reception mode can be applied to distributed unit 1 (910). Accordingly, distributed unit 1 (910) can improve performance abnormalities (such as increased error rate and / or insufficient capacity) identified in distributed unit 1 (910) by applying a different reception mode.

[0133] Embodiments according to the present disclosure may have the order of some operations changed or omitted within a range that can be changed by a person skilled in the art, and it can be understood that the present disclosure includes embodiments modified in such a manner.

[0134] FIG. 10 is a drawing for explaining a method for changing a reception mode according to one embodiment of the present disclosure.

[0135] The embodiment of FIG. 10 may be a more specific example of the embodiment of FIG. 9. The embodiment of FIG. 10 may represent an embodiment in which information is pre-shared between distributed units. Furthermore, the embodiment of FIG. 10 may represent an embodiment in which, when a capacity shortage is identified in distributed unit 1 (1010), the capacity shortage problem is resolved by cooperating with other distributed units to change the reception mode.

[0136] Referring to FIG. 10, operation 1062 may represent an operation of sharing information between distributed units (e.g., DU1, DU2, and DU3). The information shared between distributed units may include information related to the capacity of each distributed unit, information related to resource scheduling, measurement information related to signals, and the like.

[0137] Capacity-related information may indicate whether each distributed unit has sufficient computational capacity. Alternatively, capacity-related information may be used to determine whether each distributed unit has sufficient computational capacity.

[0138] Information related to resource scheduling may indicate information about resources scheduled by each distributed unit. Information related to resource scheduling may include information for a specific distributed unit to determine another distributed unit related to an interference signal. For example, distributed unit 1 (1010) (DU1) may identify that the distributed unit related to interference received by distributed unit 1 (1010) is distributed unit 2 (1020) (DU2) based on information related to resource scheduling. If frequency domain resources (or time domain resources) allocated to user terminal group 1 (1040) associated with distributed unit 1 (1010) and frequency domain resources (or time domain resources) allocated to user terminal group 2 (1050) associated with distributed unit 2 (1020) are such that interference may occur, distributed unit 1 (1010) may identify that the interference signal is coming from user terminal group 2 (1050) associated with distributed unit 2 (1020) based on information related to resource scheduling.

[0139] Measurement information related to a signal may include channel estimation information, interference signal and noise estimation information, etc.

[0140] Through operation 1062, each distributed unit can receive information about other distributed units. Accordingly, when a performance abnormality is identified, each distributed unit can determine which other distributed units it can request cooperation to resolve the performance abnormality. For example, in this example, distributed unit 1 (1010) can identify that interference is coming from user terminal group 2 related to distributed unit 2 (1020) through operation 1062, and can determine that distributed unit 2 (1020) currently has spare capacity. That is, distributed unit 1 (1010) can request cooperation from distributed unit 2 (1020) when identifying a performance abnormality based on the information received through operation 1062.

[0141] Operation 1064 represents an operation in which distributed unit 1 (DU1) (1010) receives a data signal from user terminal group 1 (1040). At this time, the data signal received by distributed unit 1 (1010) may include interference from user terminal group 2 (1050) or user terminal group 3 (1060). In addition, it may further include interference from user terminal groups associated with other distributed units. Similar to operation 1064, distributed unit 2 (DU2) (1020) or distributed unit 3 (1030) receives a data signal from user terminal group 2 (1050) or user terminal group 3 (1060), respectively (operation 1066 or 1068), and each data signal may include interference from another user terminal group.

[0142] Operation 1070 represents an operation in which distributed unit 1 (1010) estimates interference based on the data signal received in operation 1064. That is, distributed unit 1 (1010) can estimate the level of interference based on the signal received in operation 1064. Similarly, distributed unit 2 (1020) or distributed unit 3 (1030) can estimate the level of interference from the received signal.

[0143] Operation 1072 represents an operation in which distributed unit 1 (1010) selects reception mode 1 based on the interference signal estimated in operation 1070. Reception mode 1 may correspond to any one of a plurality of selectable reception modes. In operation 1072, the operation in which distributed unit 1 (1010) selects the reception mode based on the interference signal may correspond to any one of the embodiments described in FIGS. 4 to 6. That is, distributed unit 1 (1010) may estimate the state of the interference signal or noise, estimate the ratio of the interference signal, and compare the ratio of the interference signal with a preset threshold value to determine the reception mode to apply. In addition, distributed unit 1 (1010) may compare the SINR and the ratio of the interference signal with preset threshold values ​​to determine the reception mode to apply. The reception mode may correspond to any one of MMSE or MMSE-IRC. However, the reception mode may correspond to any one of the known reception modes as well as those specified in the present disclosure. Similarly, distributed unit 2 (1020) or distributed unit 3 (1030) can each select a reception mode based on the received signal. In this example, distributed unit 2 (1020) or distributed unit 3 (1030) can each select reception mode 2 based on the received signal.

[0144] The 1074 operation may indicate that the distributed unit 1 (1010) identifies a performance abnormality (e.g., insufficient capacity). The distributed unit 1 (1010) may identify a performance abnormality when the computational capacity required for the service is insufficient or is expected to be insufficient, or when the error rate (e.g., BLER) for the data received is increasing or is expected to increase. Specifically, the distributed unit 1 (1010) may determine or predict a current or future performance abnormality by comparing a predefined threshold value with information indicating a current state or a future state to identify the performance abnormality. In this example, the 1074 operation may indicate that the distributed unit 1 (1010) has identified a state in which the capacity is insufficient or a state in which a capacity shortage is expected.

[0145] Operation 1076 may indicate an operation in which, when distributed unit 1 (1010) identifies a performance abnormality, distributed unit 1 (1010) requests cooperation from distributed unit 2 (1020) to resolve the performance abnormality. Based on the information received by operation 1062, distributed unit 1 (1010) may determine the distributed unit to request cooperation as distributed unit 2 (1020). At this time, the request to distributed unit 2 (1020) may be a request to control a signal of user terminal group 2 associated with distributed unit 2 (1020). That is, the request to distributed unit 2 (1020) includes a signal control request for a terminal associated with distributed unit 2 (1020). User terminal group 2 (1040) associated with distributed unit 2 (1020) may include terminals that transmit data signals to distributed unit 2 (1020).

[0146] Operation 1076 may include an operation in which, if distributed unit 1 (1010) identifies a performance abnormality, distributed unit 1 (1010) determines a distributed unit to request cooperation to resolve the performance abnormality. At this time, distributed unit 1 (1010) may determine a distributed unit to request cooperation based on the information received in operation 1062.

[0147] Action 1078 may represent an action in which distributed unit 1 (1010) receives a response to a request for action 1076 from distributed unit 2 (1020). That is, a distributed unit may receive a response to a cooperation request from another distributed unit.

[0148] Operation 1080 represents an operation in which distributed unit 1 (1010) transmits signal strength control information to user terminal group 1 (1040). The signal strength control information may include control information for adjusting the transmission strength of terminals included in user terminal group 1 (1040). Accordingly, the transmission strength of terminals included in user terminal group 1 (1040) may be increased, decreased, or maintained by the signal strength control information.

[0149] In operation 1082, distributed unit 2 (1020) can transmit signal strength control information to user terminal group 2 (1050). The signal strength control information can include control information for adjusting the transmission strength of terminals included in user terminal group 2 (1050). Accordingly, the transmission strength of terminals included in user terminal group 2 (1050) can be increased, decreased, or maintained by the signal strength control information. In addition, the signal strength control information transmitted by distributed unit 2 (1020) can increase, decrease, or maintain the transmission strength of terminals included in user terminal group 2 (1050) based on the transmission and reception contents of operations 1076 to 1078. For example, in operation 1076, if distributed unit 1 (1010) requests distributed unit 2 (1020) to lower the transmission strength of user terminal group 2, the signal strength control information transmitted by distributed unit 2 (1020) may be control information for reducing the transmission strength of terminals included in user terminal group 2 (1050).

[0150] The 1084 operation may represent an operation in which terminals included in user terminal group 1 (1040) change transmission settings based on signal strength control information received by the 1080 operation. In this example, terminals included in user terminal group 1 (1040) may be set to increase transmission strength.

[0151] Action 1086 may represent an action in which terminals included in user terminal group 2 (1050) change transmission settings based on signal strength control information received by action 1082. In this example, terminals included in user terminal group 2 (1050) may be set to reduce transmission strength.

[0152] Operation 1088 may represent an operation in which terminals included in user terminal group 1 (1040) transmit data signals to distribution unit 1 (1010) with a signal strength changed by operation 1084. Similar to operation 1088, in operation 1090, terminals included in user terminal group 2 (1050) may transmit data signals with a signal strength changed by operation 1086. Operation 1092 may represent an operation in which terminals included in user terminal group 3 (1060) transmit data signals to distribution unit 3 (1030).

[0153] Operation 1094 may represent an operation in which distributed unit 1 (1010) estimates interference based on a signal received in operation 1088. At this time, the interference ratio of the signal received by distributed unit 1 (1010) may change depending on the signal strength of user terminal group 2 (1050). For example, when the signal strength of user terminal group 2 (1050) increases, the magnitude of interference included in the signal received by distributed unit 1 (1010) may increase, and when the signal strength of user terminal group 2 (1050) decreases, the ratio of interference included in the signal received by distributed unit 1 (1010) may decrease. Similar to operation 1094, distributed unit 2 (1020) may estimate interference based on a signal received from user terminal group 2 (1050).

[0154] Operation 1096 represents an operation in which distributed unit 1 (1010) selects a reception mode based on the interference signal estimated in operation 1094. In operation 1096, the operation in which distributed unit 1 (1010) selects a reception mode based on the interference signal may correspond to any one of the embodiments described in FIGS. 4 to 6. That is, distributed unit 1 (1010) may estimate the state of an interference signal or noise, estimate a ratio of an interference signal, and compare the ratio of the interference signal with a preset threshold value to determine a reception mode to apply. In addition, distributed unit 1 (1010) may compare the SINR and the ratio of the interference signal with preset threshold values ​​to determine a reception mode to apply. The reception mode may correspond to any one of MMSE or MMSE-IRC. However, the reception mode may correspond to any one of the known reception modes as well as those specified in the present disclosure. In this example, distributed unit 1 (1010) may be advantageous in applying an MMSE-based reception mode because the strength of the signal received from user terminal group 1 (1040) has increased and the strength of the interference received from user terminal group 2 (1050) has decreased.

[0155] Since the magnitude of the interference signal received by the distributed unit 1 (1010) may change by operation 1076 to operation 1086, the reception mode 2 selected in operation 1096 may be different from the reception mode 1 selected in operation 1072. Similarly, the distributed unit 2 (1020) may apply a reception mode 1 different from the previous reception mode 2 depending on the changed magnitude of the interference signal. In the case of the distributed unit 3 (1030), since it is not affected in any way, the same reception mode 2 as before may be selected. In this example, the reception mode 1 may be an MMSE-IRC-based reception mode, and the reception mode 2 may be an MMSE-based reception mode. Since the distributed unit 1 (1010) changes from the MMSE-IRC-based reception mode with high computational complexity to the MMSE-based reception mode with low computational complexity, the capacity shortage problem due to complex operations can be resolved.

[0156] According to the embodiment of FIG. 10, the intensity of an interference signal received by distributed unit 1 (1010) can be adjusted through cooperation with distributed unit 1 (1010) and distributed unit 2 (1020), and accordingly, a different reception mode can be applied to distributed unit 1 (1010). Accordingly, distributed unit 1 (1010) can improve performance abnormalities (such as increased error rate and / or insufficient capacity) identified in distributed unit 1 (1010) by applying a different reception mode.

[0157] According to the embodiment of FIG. 10, distributed unit 1 (1010) can receive information related to computational capabilities and / or resource scheduling information for other distributed units, and can determine which distributed unit to request cooperation from in the event of a performance abnormality. Accordingly, distributed unit 1 (1010) does not need to request cooperation from all distributed units, thereby simplifying operations for resolving performance abnormality issues.

[0158] Embodiments according to the present disclosure may have the order of some operations changed or omitted within a range that can be changed by a person skilled in the art, and it can be understood that the present disclosure includes embodiments modified in such a manner.

[0159] FIG. 11 is a drawing for explaining a method for changing a reception mode according to one embodiment of the present disclosure.

[0160] The embodiment of FIG. 11 may represent an embodiment in which information is not pre-shared between distributed units, and a request is sent to all distributed units when a performance abnormality is identified in a specific distributed unit. The embodiment of FIG. 11 may represent an embodiment in which, when a capacity shortage is identified in distributed unit 1 (1110), the capacity shortage problem is resolved by cooperating with other distributed units to change the reception mode.

[0161] Referring to FIG. 11, operation 1162 represents an operation in which distributed unit 1 (DU1) (1110) receives a data signal from user terminal group 1 (1140). At this time, the data signal received by distributed unit 1 (1110) may include interference from user terminal group 2 (1150) or user terminal group 3 (1160). In addition, the data signal may further include interference from user terminal groups associated with other distributed units. Similar to operation 1162, distributed unit 2 (DU2) (1120) or distributed unit 3 (1130) receives a data signal from user terminal group 2 (1150) or user terminal group 3 (1160), respectively (operation 1164 or 1166), and each data signal may include interference from another user terminal group.

[0162] Operation 1168 represents an operation in which distributed unit 1 (1110) estimates interference based on the data signal received in operation 1162. That is, distributed unit 1 (1110) can estimate the level of interference based on the signal received in operation 1162. Similarly, distributed unit 2 (1120) or distributed unit 3 (1130) can estimate the level of interference from the received signal.

[0163] Operation 1170 represents an operation in which distributed unit 1 (1110) selects reception mode 1 based on the interference signal estimated in operation 1168. Reception mode 1 may correspond to any one of a plurality of selectable reception modes. In operation 1170, the operation in which distributed unit 1 (1110) selects a reception mode based on the interference signal may correspond to any one of the embodiments described in FIGS. 4 to 6. That is, distributed unit 1 (1110) may estimate the state of an interference signal or noise, estimate a ratio of an interference signal, and compare the ratio of the interference signal with a preset threshold value to determine a reception mode to apply. In addition, distributed unit 1 (1110) may compare the SINR and the ratio of the interference signal with preset threshold values ​​to determine a reception mode to apply. The reception mode may correspond to any one of MMSE or MMSE-IRC. However, the reception mode may correspond to any one of the known reception modes as well as those specified in the present disclosure. Similarly, distributed unit 2 (1120) or distributed unit 3 (1130) can each select a reception mode based on the received signal. In this example, distributed unit 2 (1120) or distributed unit 3 (1130) can each select reception mode 2 based on the received signal.

[0164] The 1172 operation may indicate that the distributed unit 1 (1110) identifies a performance abnormality (e.g., insufficient capacity). The distributed unit 1 (1110) may identify a performance abnormality when the computational capacity required for the service is insufficient or is expected to be insufficient, or when the error rate (e.g., BLER) for the data received is increasing or is expected to increase. Specifically, the distributed unit 1 (1110) may determine or predict a current or future performance abnormality by comparing a predefined threshold value with information indicating a current state or a future state to identify the performance abnormality. In this example, the 1172 operation may indicate that the distributed unit 1 (1110) has identified a state in which the capacity is insufficient or a state in which a capacity shortage is expected.

[0165] Actions 1174 and 1176 may indicate actions for requesting cooperation from all distributed units (distributed unit 2 and distributed unit 3) to resolve a performance abnormality when distributed unit 1 (1110) identifies a performance abnormality. At this time, the request to distributed unit 2 (1120) may be a request to control a signal of user terminal group 2 (1150) associated with distributed unit 2 (1120). That is, the request to distributed unit 2 (1120) may indicate a signal control request for a terminal associated with distributed unit 2 (1120). User terminal group 2 (1040) associated with distributed unit 2 (1120) may include terminals that transmit data signals to distributed unit 2 (1120). In addition, the request to distributed unit 3 (1130) may be a request to control a signal of user terminal group 3 (1160) associated with distributed unit 3 (1130). That is, the request for distributed unit 3 (1130) includes a signal control request for a terminal associated with distributed unit 3 (1130). User terminal group 3 (1160) associated with distributed unit 3 (1130) may include terminals that transmit data signals to distributed unit 3 (1130).

[0166] The request of operation 1174 and operation 1176 may include information related to the computing capacity of distributed unit 1 (1110), information related to resource scheduling, and / or information related to a received signal. The distributed unit that has received the request of distributed unit 1 (1110) may determine whether to transmit a response to distributed unit 1 (1110) based on the information included in the request of distributed unit 1 (1110). For example, distributed unit 2 (1120) may determine whether to transmit a response to distributed unit 1 (1110) based on whether the interference received by distributed unit 1 (1110) is caused by user terminal group 2 (1150) associated with distributed unit 2 (1120) and / or whether the computing capacity of distributed unit 2 (1120) is sufficient.

[0167] Action 1178 may represent an action in which distributed unit 1 (1110) receives a response to a request for action 1174 from distributed unit 2 (1120). That is, a distributed unit may receive a response to a request for cooperation from another distributed unit. In this example, distributed unit 2 (1120) determines that cooperation is possible for the request of distributed unit 1 (1110) and transmits a response, and distributed unit 3 (1130) does not determine that cooperation is possible for the request of distributed unit 1 (1110) and does not transmit a response.

[0168] Operation 1180 represents an operation in which distributed unit 1 (1110) transmits signal strength control information to user terminal group 1 (1140). The signal strength control information may include control information for adjusting the transmission strength of terminals included in user terminal group 1 (1140). Accordingly, the transmission strength of terminals included in user terminal group 1 (1140) may be increased, decreased, or maintained by the signal strength control information.

[0169] Operation 1182 may represent an operation in which distributed unit 2 (1120) transmits signal strength control information to user terminal group 2 (1150). The signal strength control information may include control information for adjusting the transmission strength of terminals included in user terminal group 2 (1150). Accordingly, the transmission strength of terminals included in user terminal group 2 (1150) may be increased, decreased, or maintained by the signal strength control information. In addition, the signal strength control information transmitted by distributed unit 2 (1120) may increase, decrease, or maintain the transmission strength of terminals included in user terminal group 2 (1150) based on the transmission and reception contents of operations 1174 and 1178. For example, in operation 1174, if distributed unit 1 (1110) requests distributed unit 2 (1120) to lower the transmission strength of user terminal group 2, the signal strength control information transmitted by distributed unit 2 (1120) may be control information for reducing the transmission strength of terminals included in user terminal group 2 (1150).

[0170] Action 1184 may represent an action in which terminals included in user terminal group 1 (1140) change transmission settings based on signal strength control information received by action 1180. In this example, terminals included in user terminal group 1 (1140) may be set to increase transmission strength.

[0171] Action 1186 may represent an action in which terminals included in user terminal group 2 (1150) change transmission settings based on signal strength control information received by action 1182. In this example, terminals included in user terminal group 2 (1150) may be set to reduce transmission strength.

[0172] Operation 1188 may represent an operation in which terminals included in user terminal group 1 (1140) transmit data signals to distribution unit 1 (1110) with a signal strength changed by operation 1184. Similarly to operation 1188, in operation 1190, terminals included in user terminal group 2 (1150) may transmit data signals with a signal strength changed by operation 1186. Operation 1192 may represent an operation in which terminals included in user terminal group 3 (1160) transmit data signals to distribution unit 3 (1130).

[0173] Operation 1194 may represent an operation in which distributed unit 1 (1110) estimates interference based on a signal received in operation 1188. At this time, the interference ratio of the signal received by distributed unit 1 (1110) may change according to the signal strength of user terminal group 2 (1150). For example, when the signal strength of user terminal group 2 (1150) increases, the magnitude of interference included in the signal received by distributed unit 1 (1110) may increase, and when the signal strength of user terminal group 2 (1150) decreases, the ratio of interference included in the signal received by distributed unit 1 (1110) may decrease. Similar to operation 1194, distributed unit 2 (1120) may estimate interference based on a signal received from user terminal group 2 (1150).

[0174] Operation 1196 represents an operation in which distributed unit 1 (1110) selects a reception mode based on the interference signal estimated in operation 1194. In operation 1196, the operation in which distributed unit 1 (1110) selects a reception mode based on the interference signal may correspond to any one of the embodiments described in FIGS. 4 to 6. That is, distributed unit 1 (1110) may estimate the state of an interference signal or noise, estimate a ratio of an interference signal, and compare the ratio of the interference signal with a preset threshold value to determine a reception mode to apply. In addition, distributed unit 1 (1110) may compare the SINR and the ratio of the interference signal with preset threshold values ​​to determine a reception mode to apply. The reception mode may correspond to any one of MMSE or MMSE-IRC. However, the reception mode may correspond to any one of the known reception modes as well as those specified in the present disclosure. In this example, distributed unit 1 (1110) may be advantageous in applying an MMSE-based reception mode because the strength of the signal received from user terminal group 1 (1140) has increased and the strength of the interference received from user terminal group 2 (1150) has decreased.

[0175] Since the ratio of interference signals received by distributed unit 1 (1110) may change by operations 1174 to 1188, the reception mode 2 selected in operation 1196 may be different from the reception mode 1 selected in operation 1170. Similarly, distributed unit 2 (1120) may apply a reception mode 1 different from the previous reception mode 2 depending on the magnitude of the changed interference signal. In the case of distributed unit 3 (1130), since it is not affected in any way, the same reception mode 2 as before may be selected. In this example, reception mode 1 may be an MMSE-IRC-based reception mode, and reception mode 2 may be an MMSE-based reception mode. Since distributed unit 1 (1110) changes from an MMSE-IRC-based reception mode with high computational complexity to an MMSE-based reception mode with low computational complexity, the capacity shortage problem due to complex operations can be resolved.

[0176] According to the embodiment of FIG. 11, the intensity of an interference signal received by distributed unit 1 (1110) can be adjusted through cooperation with distributed unit 1 (1110) and distributed unit 2 (1120), and accordingly, a different reception mode can be applied to distributed unit 1 (1110). Accordingly, distributed unit 1 (1110) can improve performance abnormalities (such as increased error rate and / or insufficient capacity) identified in distributed unit 1 (1110) by applying a different reception mode.

[0177] According to the embodiment of FIG. 11, distributed unit 2 (1120) can receive a request including information related to computational capabilities and / or resource scheduling information from distributed unit 1 (1110), and can determine whether cooperation is possible based on the received information. Distributed unit 2 (1120) can transmit a response to the request to distributed unit 1 (1110) based on the result of the determination of whether cooperation is possible.

[0178] Embodiments according to the present disclosure may have the order of some operations changed or omitted within a range that can be changed by a person skilled in the art, and it can be understood that the present disclosure includes embodiments modified in such a manner.

[0179] FIG. 12 is a drawing for explaining a method for changing a reception mode according to one embodiment of the present disclosure.

[0180] The embodiment of FIG. 12 may represent an embodiment in which, when a performance abnormality is identified in multiple distributed units, each distributed unit that has identified a performance abnormality transmits a request to all distributed units. The embodiment of FIG. 12 may represent an embodiment in which, when an error increase is identified in distributed unit 1 (1210), the problem of increased errors is resolved by cooperating with other distributed units to change the reception mode.

[0181] Referring to FIG. 12, operation 1262 represents an operation in which distributed unit 1 (DU1) (1210) receives a data signal from user terminal group 1 (1240). At this time, the data signal received by distributed unit 1 (1210) may include interference from user terminal group 2 (1250) or user terminal group 3 (1260). In addition, the data signal may further include interference from user terminal groups associated with other distributed units. Similar to operation 1262, distributed unit 2 (DU2) (1220) or distributed unit 3 (1230) receives a data signal from user terminal group 2 (1250) or user terminal group 3 (1260), respectively (operation 1264 or 1266), and each data signal may include interference from another user terminal group.

[0182] Operation 1268 represents an operation in which distributed unit 1 (1210) estimates interference based on the data signal received in operation 1262. That is, distributed unit 1 (1210) can estimate the level of interference based on the signal received in operation 1262. Similarly, distributed unit 2 (1220) or distributed unit 3 (1230) can estimate the level of interference from the received signal.

[0183] Operation 1270 represents an operation in which distributed unit 1 (1210) selects reception mode 2 based on the interference signal estimated in operation 1268. Reception mode 2 may correspond to any one of a plurality of selectable reception modes. In operation 1270, the operation in which distributed unit 1 (1210) selects a reception mode based on the interference signal may correspond to any one of the embodiments described in FIGS. 4 to 6. That is, distributed unit 1 (1210) may estimate the state of the interference signal or noise, estimate the ratio of the interference signal, and compare the ratio of the interference signal with a preset threshold value to determine the reception mode to apply. In addition, distributed unit 1 (1210) may compare the SINR and the ratio of the interference signal with preset threshold values ​​to determine the reception mode to apply. The reception mode may correspond to any one of MMSE or MMSE-IRC. However, the reception mode may correspond to any one of the known reception modes as well as those specified in the present disclosure. Similarly, distributed unit 2 (1220) or distributed unit 3 (1230) can each select a reception mode based on the received signal. In this example, distributed unit 2 (1220) or distributed unit 3 (1230) can each select reception mode 2 based on the received signal.

[0184] Action 1272 may indicate an action by distributed unit 1 (1210) to identify a performance anomaly (e.g., an increase in errors). Distributed unit 1 (1210) may identify a performance anomaly when the computing power required for the service is insufficient or is expected to be insufficient, or when the error rate (e.g., BLER) for the data received is increasing or is expected to increase. Specifically, distributed unit 1 (1210) may determine or predict a current or future performance anomaly by comparing a predefined threshold value with information indicating a current state or a future state to identify a performance anomaly. In this example, action 1272 may indicate that distributed unit 1 (1210) has identified a state in which an error rate is high or is expected to be high.

[0185] Actions 1274 and 1276 may indicate actions in which, when distributed unit 1 (1210) and distributed unit 2 (1220) identify a performance abnormality, each distributed unit requests cooperation from other distributed units to resolve the performance abnormality. At this time, the request to each distributed unit may be a request to control a signal of a user terminal group associated with the corresponding distributed unit. That is, the request to distributed unit 2 (1220) includes a signal control request for terminals associated with distributed unit 2 (1220). User terminal group 2 (1040) associated with distributed unit 2 (1220) may include terminals that transmit data signals to distributed unit 2 (1220). In addition, the request to distributed unit 3 (1230) may be a request to control a signal of user terminal group 3 (1260) associated with distributed unit 3 (1230). That is, the request to distributed unit 3 (1230) includes a signal control request for a terminal associated with distributed unit 3 (1230). User terminal group 3 (1260) associated with distributed unit 3 (1230) may include terminals that transmit data signals to distributed unit 3 (1230). Distributed unit 2 (1220) may transmit cooperation requests to other distributed units, such as distributed unit 1 (1210) and distributed unit 3 (1230), to resolve performance abnormalities.

[0186] In various embodiments, distributed unit 2 (1220) may identify in advance distributed units capable of requesting cooperation. For example, as in the embodiment of FIG. 10, information may be shared in advance between distributed units (e.g., operation 1062 of FIG. 10). In this case, distributed unit 2 (1220) may recognize in advance distributed units capable of cooperation and may transmit cooperation requests only to distributed units capable of cooperation.

[0187] The request of operation 1274 and operation 1276 may include information related to the computing capacity of the distributed unit, error rate information, resource scheduling information, and / or received signal information. The distributed unit that received the request of distributed unit 1 (1210) may determine whether to transmit a response to distributed unit 1 (1210) based on the information included in the request of distributed unit 1 (1210). For example, distributed unit 2 (1220) may determine whether to transmit a response to distributed unit 1 (1210) based on whether the interference received by distributed unit 1 (1210) is caused by user terminal group 2 (1250) associated with distributed unit 2 (1220) and / or whether the computing capacity of distributed unit 2 (1220) is sufficient. In this example, distributed unit 3 (1230) can determine whether to send a response to the requests of distributed unit 1 (1210) and distributed unit 2 (1220) based on the information included in each request, as described above, and can send a response to each request accordingly.

[0188] Action 1278 may represent an action in which distributed unit 1 (1210) receives a response to a request of action 1274 from distributed unit 2 (1220). That is, a distributed unit may receive a response to a cooperation request from another distributed unit. In this example, distributed unit 2 (1220) determines that cooperation is possible for the request of distributed unit 1 (1210) and transmits a response, and distributed unit 3 (1230) does not determine that cooperation is possible for the request of distributed unit 1 (1210) and does not transmit a response. In addition, distributed unit 1 (1210) may determine that cooperation is possible for the request of distributed unit 2 (1220) and transmit a response to distributed unit 2 (1220).

[0189] Operation 1280 represents an operation in which distributed unit 1 (1210) transmits signal strength control information to user terminal group 1 (1240). The signal strength control information may include control information for adjusting the transmission strength of terminals included in user terminal group 1 (1240). Accordingly, the transmission strength of terminals included in user terminal group 1 (1240) may be increased, decreased, or maintained by the signal strength control information.

[0190] Operation 1282 may represent an operation in which distributed unit 2 (1220) transmits signal strength control information to user terminal group 2 (1250). The signal strength control information may include control information for adjusting the transmission strength of terminals included in user terminal group 2 (1250). Accordingly, the transmission strength of terminals included in user terminal group 2 (1250) may be increased, decreased, or maintained by the signal strength control information. In addition, the signal strength control information transmitted by distributed unit 2 (1220) may increase, decrease, or maintain the transmission strength of terminals included in user terminal group 2 (1250) based on the transmission and reception contents of operations 1274 to 1278. For example, in operation 1274, when distributed unit 1 (1210) requests distributed unit 2 (1220) to increase the transmission strength of user terminal group 2, the signal strength control information transmitted by distributed unit 2 (1220) may be control information for increasing the transmission strength of terminals included in user terminal group 2 (1250).

[0191] Action 1284 may represent an action in which terminals included in user terminal group 1 (1240) change transmission settings based on signal strength control information received by action 1280. In this example, terminals included in user terminal group 1 (1240) may be set to increase transmission strength.

[0192] Action 1286 may represent an action in which terminals included in user terminal group 2 (1250) change transmission settings based on signal strength control information received by action 1282. In this example, terminals included in user terminal group 2 (1250) may be set to increase transmission strength.

[0193] Operation 1288 may represent an operation in which terminals included in user terminal group 1 (1240) transmit data signals to distribution unit 1 (1210) with a signal strength changed by operation 1284. Similar to operation 1288, in operation 1290, terminals included in user terminal group 2 (1250) may transmit data signals with a signal strength changed by operation 1286. Operation 1292 may represent an operation in which terminals included in user terminal group 3 (1260) transmit data signals to distribution unit 3 (1230).

[0194] Operation 1294 may represent an operation in which distributed unit 1 (1210) estimates interference based on the signal received in operation 1288. At this time, the interference ratio of the signal received by distributed unit 1 (1210) may change according to the signal strength of user terminal group 2 (1250). For example, when the signal strength of user terminal group 2 (1250) increases, the magnitude of the interference included in the signal received by distributed unit 1 (1210) may increase, and when the signal strength of user terminal group 2 (1250) decreases, the ratio of the interference included in the signal received by distributed unit 1 (1210) may decrease. Similar to operation 1294, distributed unit 2 (1220) may estimate interference based on the signal received from user terminal group 2 (1250). In this example, since the signal strength of user terminal group 1 (1240) increases, the interference ratio of the signal received by distributed unit 2 (1220) may increase.

[0195] Operation 1296 represents an operation in which distributed unit 1 (1210) selects a reception mode based on the interference signal estimated in operation 1294. In operation 1296, the operation in which distributed unit 1 (1210) selects a reception mode based on the interference signal may correspond to any one of the embodiments described in FIGS. 4 to 6. That is, distributed unit 1 (1210) may estimate the state of an interference signal or noise, estimate a ratio of an interference signal, and compare the ratio of the interference signal with a preset threshold value to determine a reception mode to apply. In addition, distributed unit 1 (1210) may compare the SINR and the ratio of the interference signal with preset threshold values ​​to determine a reception mode to apply. The reception mode may correspond to any one of MMSE or MMSE-IRC. However, the reception mode may correspond to any one of the known reception modes as well as those specified in the present disclosure. In this example, distributed unit 1 (1210) may be advantageous in applying an MMSE-IRC based reception mode because the intensity of interference received from user terminal group 2 (1250) has increased.

[0196] Since the ratio of interference signals received by distributed unit 1 (1210) may change by operations 1274 to 1288, the reception mode 1 selected in operation 1296 may be different from the reception mode 2 selected in operation 1270. Similarly, distributed unit 2 (1220) may apply a reception mode 1 different from the previous reception mode 2 depending on the changed magnitude of the interference signal. In the case of distributed unit 3 (1230), since it is not affected in any way, the same reception mode 2 as before may be selected. In this example, reception mode 1 may be a reception mode based on MMSE-IRC, and reception mode 2 may be a reception mode based on MMSE. Distributed unit 1 (1210) and distributed unit 2 (1220) may solve the problem of increased error rates by changing to the reception mode based on MMSE-IRC, which has better signal detection performance, in a situation where the error rate increases.

[0197] According to the embodiment of FIG. 12, the intensity of the interference signal received by distributed unit 1 (1210) and distributed unit 2 (1220) can be adjusted through cooperation with distributed unit 1 (1210) and distributed unit 2 (1220), and accordingly, the reception mode of distributed unit 1 (1210) and distributed unit 2 (1220) can be changed. Accordingly, multiple distributed units that have experienced performance abnormalities can improve the identified performance abnormality problem (increased error rate and / or insufficient capacity, etc.) by applying a more appropriate reception mode.

[0198] According to the embodiment of FIG. 12, the first distributed unit may receive a request including information related to computational capabilities and / or resource scheduling information from the second distributed unit, and may determine whether cooperation is possible based on the received information. The first distributed unit may transmit a response to the request to the second distributed unit based on the result of the determination of whether cooperation is possible.

[0199] Embodiments according to the present disclosure may have the order of some operations changed or omitted within a range that can be changed by a person skilled in the art, and it can be understood that the present disclosure includes embodiments modified in such a manner.

[0200] FIG. 13 is a drawing for explaining a method for changing a reception mode according to one embodiment of the present disclosure.

[0201] The embodiment of FIG. 13 may represent an embodiment in which, when a performance abnormality is identified in a plurality of distributed units, the reception mode applied to the plurality of distributed units is changed by the central unit.

[0202] Referring to FIG. 13, operation 1371 represents an operation in which distributed unit 1 (DU1) (1310) receives a data signal from user terminal group 1 (1340). At this time, the data signal received by distributed unit 1 (1310) may include interference from user terminal group 2 (1350) or user terminal group 3 (1360). In addition, the data signal may further include interference from user terminal groups associated with other distributed units. Similar to operation 1371, distributed unit 2 (DU2) (1320) or distributed unit 3 (1330) receives a data signal from user terminal group 2 (1350) or user terminal group 3 (1360), respectively (operation 1372 or 1373), and each data signal may include interference from another user terminal group.

[0203] Operation 1374 represents an operation in which distributed unit 1 (1310) estimates interference based on the data signal received in operation 1371. That is, distributed unit 1 (1310) can estimate the level of interference based on the signal received in operation 1371. Similarly, distributed unit 2 (1320) or distributed unit 3 (1330) can estimate the level of interference from the signal received, respectively.

[0204] Operation 1376 represents an operation in which distributed unit 1 (1310) selects reception mode 1 based on the interference signal estimated in operation 1374. Reception mode 1 may correspond to any one of a plurality of selectable reception modes. In operation 1376, the operation in which distributed unit 1 (1310) selects a reception mode based on the interference signal may correspond to any one of the embodiments described in FIGS. 4 to 6. That is, distributed unit 1 (1310) may estimate the state of the interference signal or noise, estimate the ratio of the interference signal, and compare the ratio of the interference signal with a preset threshold value to determine the reception mode to apply. In addition, distributed unit 1 (1310) may compare the SINR and the ratio of the interference signal with preset threshold values ​​to determine the reception mode to apply. The reception mode may correspond to any one of MMSE or MMSE-IRC. However, the reception mode may correspond to any one of the known reception modes as well as those specified in the present disclosure. Similarly, distributed unit 2 (1320) or distributed unit 3 (1330) can each select a reception mode based on the received signal. In this example, distributed unit 2 (1320) can select reception mode 1 based on the received signal.

[0205] Action 1378 may indicate an action by distributed unit 1 (1310) to identify a performance abnormality (e.g., insufficient capacity). Distributed unit 1 (1310) may identify a performance abnormality when the computational capacity required for the service is insufficient or is expected to be insufficient, or when the error rate (e.g., BLER) for received data is increasing or is expected to increase. Specifically, distributed unit 1 (1310) may determine or predict a current or future performance abnormality by comparing a predefined threshold value with information representing a current state or a future state to identify a performance abnormality. In this example, action 1378 may indicate that distributed unit 1 (1310) has identified a state in which computational capacity is insufficient or is expected to be insufficient. Similarly, distributed unit 2 (1320) in this example identifies a state in which computational capacity is insufficient or is expected to be insufficient.

[0206] The distributed unit according to embodiments of the present disclosure can determine or predict whether a performance abnormality exists at predetermined time intervals. The distributed unit can periodically determine whether a performance abnormality exists or whether a performance abnormality is expected.

[0207] Operation 1380 represents an operation in which a distributed unit determines that there is no distributed unit to request cooperation to resolve a performance abnormality. Operation 1380 may be performed based on information about other distributed units received in advance (e.g., information about computational capabilities, information about resource scheduling, information about error rates, and / or information about signals). Operation 1380 may represent a case in which a distributed unit with performance abnormality searches for a distributed unit to request cooperation based on information about other distributed units, but finds no searched distributed unit. If a distributed unit with performance abnormality cannot request cooperation from other distributed units due to a preset configuration, operation 1380 may be omitted.

[0208] Action 1382 may represent an action in which a distributed unit (distributed unit 1 and distributed unit 2) with abnormal performance reports an abnormal performance to a central unit (1370).

[0209] In one embodiment, a distributed unit may periodically report performance abnormalities to the central unit. Upon receiving a performance abnormality report, the central unit may transmit configuration information to the distributed unit, taking into account the distributed unit's computational capabilities.

[0210] Operations 1384 and 1386 may represent operations of transmitting configuration information from the central unit (1370) to distributed unit 1 (1310) and distributed unit 2 (1320), respectively. Each configuration information may be determined by considering the computational capability of a distributed unit that is above performance, whether there is interference between user terminal groups assigned to each distributed unit, etc. The configuration information may be related to control of the transmission signal strength of a user terminal group for the distributed unit. For example, the distributed unit may transmit signal strength control information for increasing the transmission signal strength of the user terminal group to the user terminal group according to the configuration information received from the central unit, or may transmit signal strength control information for decreasing the transmission signal strength of the user terminal group to the user terminal group. In this example, operation 1384 represents an operation of the central unit (1370) transmitting configuration information for setting reception mode 2 to distributed unit 1 (1310) and distributed unit 2 (1320). Additionally, operation 1386 represents an operation in which the central unit (1370) transmits configuration information for setting reception mode 1 to the distributed unit 3 (1330). That is, the distributed unit 1 (1310), the distributed unit 2 (1320), and the distributed unit 3 (1330) can receive configuration information from the central unit (1370).

[0211] Operation 1388 represents an operation in which distributed unit 1 (1310) transmits signal strength control information to user terminal group 1 (1340). The signal strength control information may include control information for adjusting the transmission strength of terminals included in user terminal group 1 (1340). Accordingly, the transmission strength of terminals included in user terminal group 1 (1340) may be increased, decreased, or maintained by the signal strength control information.

[0212] The 1389 operation may represent an operation in which the distributed unit 2 (1320) transmits signal strength control information to the user terminal group 2 (1350). The signal strength control information may include control information for adjusting the transmission strength of the terminals included in the user terminal group 2 (1350). Accordingly, the transmission strength of the terminals included in the user terminal group 2 (1350) may be increased, decreased, or maintained by the signal strength control information.

[0213] The 1390 operation may represent an operation in which distributed unit 3 (1330) transmits signal strength control information to user terminal group 3 (1360). The signal strength control information may include control information for adjusting the transmission strength of terminals included in user terminal group 3 (1360). Accordingly, the transmission strength of terminals included in user terminal group 3 (1360) may be increased, decreased, or maintained based on the signal strength control information.

[0214] In one embodiment, the signal strength control information transmitted by each distributed unit may increase, decrease, or maintain the transmission strength of terminals included in the user terminal group based on the configuration information of operations 1384 and 1386. For example, in operation 1384, if the central unit (1370) transmits configuration information for increasing the transmission strength of user terminal group 1 to distributed unit 1 (1310), the signal strength control information transmitted by distributed unit 1 (1310) may be control information for increasing the transmission strength of terminals included in user terminal group 1 (1340).

[0215] Action 1391 may represent an action in which terminals included in user terminal group 1 (1340) change transmission settings based on signal strength control information received by action 1388. In this example, terminals included in user terminal group 1 (1340) may be set to increase transmission strength.

[0216] Action 1392 may represent an action in which terminals included in user terminal group 2 (1350) change transmission settings based on signal strength control information received by action 1389. In this example, terminals included in user terminal group 2 (1350) may be set to increase transmission strength.

[0217] Action 1393 may represent an action in which terminals included in user terminal group 3 (1360) change transmission settings based on signal strength control information received by action 1390. In this example, terminals included in user terminal group 3 (1360) may be set to reduce transmission strength.

[0218] The 1394 operation may represent an operation in which terminals included in user terminal group 1 (1340) transmit data signals to distribution unit 1 (1310) with a signal strength changed by the 1391 operation. Similarly to the 1394 operation, in the 1395 operation, terminals included in user terminal group 2 (1350) may transmit data signals with a signal strength changed by the 1392 operation. The 1396 operation may represent an operation in which terminals included in user terminal group 3 (1360) transmit data signals with a signal strength changed by the 1393 operation.

[0219] Operation 1397 may represent an operation in which distributed unit 1 (1310) estimates interference based on a signal received in operation 1394. At this time, the interference ratio of the signal received by distributed unit 1 (1310) may change according to the signal strengths of user terminal group 2 (1350) and user terminal group 3 (1360). For example, when the signal strength of user terminal group 2 (1350) increases, the magnitude of interference included in the signal received by distributed unit 1 (1310) may increase, and when the signal strength of user terminal group 2 (1350) decreases, the ratio of interference included in the signal received by distributed unit 1 (1310) may decrease. Similar to operation 1397, distributed unit 2 (1320) and distributed unit 3 (1330) may estimate interference based on the signals received from user terminal group 2 (1350) and user terminal group 3 (1360), respectively.

[0220] Operation 1398 represents an operation in which distributed unit 1 (1310) selects a reception mode based on the interference signal estimated in operation 1397. In operation 1398, the operation in which distributed unit 1 (1310) selects a reception mode based on the interference signal may correspond to any one of the embodiments described in FIGS. 4 to 6. That is, distributed unit 1 (1310) may estimate the state of an interference signal or noise, estimate a ratio of an interference signal, and compare the ratio of the interference signal with a preset threshold value to determine a reception mode to apply. In addition, distributed unit 1 (1310) may compare the SINR and the ratio of the interference signal with preset threshold values ​​to determine a reception mode to apply. The reception mode may correspond to any one of MMSE or MMSE-IRC. However, the reception mode may correspond to any one of the known reception modes as well as those specified in the present disclosure. In this example, for distributed unit 1 (1310), the strength of the signal received from user terminal group 1 (1340) increases, and the strength of the total interference received from user terminal group 2 and user terminal group 3 decreases, so it may be advantageous to apply the MMSE-based reception mode. Accordingly, distributed unit 1 (1310) can resolve the computational shortage problem by applying the MMSE-based reception mode with low computational complexity.

[0221] Since the ratio of interference signals received by distributed unit 1 (1310) may change through operations 1382 to 1393, the reception mode 2 selected in operation 1398 may be different from the reception mode 1 selected in operation 1376. Similarly, distributed unit 2 (1320) may apply a reception mode 2 different from the previous reception mode 1 depending on the magnitude of the changed interference signal. In the case of distributed unit 3 (1330), since it receives increased interference from user terminal group 1 (1340) and user terminal group 2 (1350), a reception mode 1 different from the previous reception mode 2 may be applied. In this example, reception mode 1 may be an MMSE-IRC-based reception mode, and reception mode 2 may be an MMSE-based reception mode. Distributed unit 1 (1310) and distributed unit 2 (1320) may solve the problem of insufficient computational power by applying an MMSE-based reception mode with low computational complexity in a situation of insufficient computational power.

[0222] According to the embodiment of FIG. 13, a central unit (1370) that receives a performance abnormality report from a distributed unit transmits configuration information to the distributed unit, and the distributed unit transmits signal strength control information to a group of user terminals based on the received configuration information, thereby changing the reception mode of the distributed unit. Accordingly, multiple distributed units that have experienced a performance abnormality can improve performance abnormality problems (such as increased error rate and / or insufficient capacity) by applying a more appropriate reception mode.

[0223] Embodiments according to the present disclosure may have the order of some operations changed or omitted within a range that can be changed by a person skilled in the art, and it can be understood that the present disclosure includes embodiments modified in such a manner.

[0224] FIG. 14 is a drawing for explaining a method for changing the reception mode of a first DU according to one embodiment of the present disclosure.

[0225] The first distributed unit performing the operations of FIG. 14 may correspond to the distributed units of FIGS. 7 to 13. Referring to FIG. 14, the method for changing the reception mode of the first distributed unit may include the following operations.

[0226] Operation 1410 represents an operation for identifying a performance abnormality in the first distributed unit. At this time, the performance abnormality of the first distributed unit can be identified based on computational capabilities or error rates. Operation 1410 may correspond to operation 958 of FIG. 9 , operation 1074 of FIG. 10 , operation 1172 of FIG. 11 , operation 1272 of FIG. 12 , and / or operation 1378 of FIG. 13 .

[0227] Operation 1420 represents an operation of transmitting a terminal signal control request from a first distributed unit to a second distributed unit. Operation 1420 may correspond to operation 960 of FIG. 9, operation 1076 of FIG. 10, operation 1174 or 1176 of FIG. 11, and / or operation 1274 or 1276 of FIG. 13.

[0228] Operation 1430 represents an operation in which a first distributed unit receives a response to a request from a second distributed unit. Operation 1430 may correspond to operation 960 of FIG. 9, operation 1078 of FIG. 10, operation 1178 of FIG. 11, and / or operation 1278 of FIG. 12.

[0229] Operation 1440 represents an operation of transmitting transmission strength control information from the first distribution unit to the terminals of the first group. Operation 1440 may correspond to operation 962 of FIG. 9, operation 1080 of FIG. 10, operation 1180 of FIG. 11, and / or operation 1280 of FIG. 12. The terminals of the first group may represent terminals assigned to the first distribution unit. The terminals of the first group may represent terminals corresponding to the first distribution unit. The terminals of the first group assigned to the first distribution unit may represent terminals that transmit data signals to the first distribution unit.

[0230] Operation 1450 represents an operation in which the first distribution unit receives a signal with controlled transmission strength from the terminals of the first group and the terminals of the second group assigned to the second distribution unit. Operation 1450 may correspond to operation 966 of FIG. 9, operation 1088 of FIG. 10, operation 1188 of FIG. 11, operation 1288 of FIG. 12, and / or operation 1394 of FIG. 13. The terminals of the second group assigned to the second distribution unit may represent terminals that transmit data signals to the second distribution unit.

[0231] Operation 1460 represents an operation in which the first distributed unit determines a reception mode based on the signal received in operation 1450. Operation 1460 may correspond to the operations described in FIGS. 4 to 6, operation 970 of FIG. 9, operation 1096 of FIG. 10, operation 1196 of FIG. 11, operation 1296 of FIG. 12, and / or operation 1398 of FIG. 13.

[0232] In one embodiment, if the transmission strength control information of operation 1440 is information for increasing the transmission strength of terminals of the first group, the first distribution unit may determine a reception mode based on MMSE in operation 1460. Then, in operation 1450, the first distribution unit may receive a signal with reduced transmission strength from terminals of the second group assigned to the second distribution unit.

[0233] The embodiment of FIG. 14 may illustrate operations in which a distributed unit that has identified a performance abnormality changes its reception mode through cooperation with other distributed units.

[0234] FIG. 15 is a diagram for explaining a terminal signal control request transmission operation of a first DU according to one embodiment of the present disclosure.

[0235] The first distributed unit performing the operations of FIG. 15 may correspond to the distributed units of FIGS. 7 to 13. Referring to FIG. 15, the terminal signal control request transmission operation of the first distributed unit may include the following operations. The terminal signal control request transmission operation of the first distributed unit in FIG. 15 may correspond to operation 1420 of FIG. 14.

[0236] Referring to FIG. 15, the operation of transmitting a terminal signal control request of the first distributed unit may include an operation (1510) of the first distributed unit determining a distributed unit related to an interference signal, an operation (1520) of determining whether to request terminal signal control based on computational capability information for the determined distributed unit, and an operation (1530) of transmitting a terminal signal control request to the determined distributed unit based on the result of determining whether to request terminal signal control.

[0237] The 1510 operation may be performed based on information obtained by the first distributed unit regarding resource scheduling of other distributed units.

[0238] Information related to resource scheduling may indicate information about resources scheduled by each distribution unit. Information related to resource scheduling may include information for a first distribution unit to determine another distribution unit associated with an interference signal. For example, the first distribution unit may identify that the distribution unit associated with interference received by the first distribution unit is a second distribution unit based on the information related to resource scheduling. If frequency domain resources (or time domain resources) allocated to a first user terminal group associated with the first distribution unit and frequency domain resources (or time domain resources) allocated to a second user terminal group associated with the second distribution unit are such that interference may occur, the first distribution unit may identify that the interference signal is coming from the second user terminal group associated with the second distribution unit based on the information related to resource scheduling.

[0239] Operation 1520 may be performed based on information about the computational capability of the distributed unit determined in operation 1510, if the first distributed unit obtains the information. For example, if the first distributed unit determines that the computational capability of the second distributed unit is sufficient, the first distributed unit may request the second distributed unit to lower the transmission strength of the user terminal associated with the second distributed unit. In addition, if the first distributed unit does not determine that the computational capability of the second distributed unit is sufficient, the first distributed unit may not request the second distributed unit to lower the transmission strength of the user terminal associated with the second distributed unit. In addition, if the first distributed unit determines that the computational capability of the second distributed unit is sufficient, the first distributed unit may transmit signal strength control information for increasing the transmission strength of the first user terminal group associated with the first distributed unit to the first user terminal group. In addition, if the first distributed unit does not determine that the computational capability of the second distributed unit is sufficient, the first distributed unit may not transmit signal strength control information for increasing the transmission strength of the first user terminal group associated with the first distributed unit to the first user terminal group.

[0240] Action 1530 may represent an action of transmitting a terminal signal control request to the distributed unit determined in action 1510 based on the decision of action 1520. The terminal signal control request may include control information for increasing, decreasing, or maintaining the transmission strength of a group of user terminals assigned to the distributed unit determined in action 1510.

[0241] In one embodiment, the first distributed unit may obtain resource scheduling related information and / or computational capability information for other distributed units in advance. (See 1062 of FIG. 10) At this time, the first distributed unit may perform operations 1510 and 1520 described above based on the obtained information. For example, the first distributed unit may receive information about frequency domain resources related to the second distributed unit from the second distributed unit, and determine the second distributed unit based on the information about the frequency domain resources related to the second distributed unit. In addition, the first distributed unit may receive information about the computational capability of the second distributed unit from the second distributed unit, and determine the second distributed unit based on the information about the computational capability of the second distributed unit.

[0242] FIG. 16 is a drawing for explaining a method for changing the reception mode of a second DU according to one embodiment of the present disclosure.

[0243] The second distributed unit performing the operations of FIG. 16 may correspond to the distributed units of FIGS. 7 to 13. Referring to FIG. 16, the method for changing the reception mode of the second distributed unit may include the following operations.

[0244] Operation 1610 may represent an operation in which the second distributed unit receives a terminal signal control request from the first distributed unit. Operation 1610 may correspond to operation 960 of FIG. 9, operation 1076 of FIG. 10, operation 1174 or 1176 of FIG. 11, and / or operation 1274 or 1276 of FIG. 13.

[0245] Operation 1620 may represent an operation for determining whether the second distributed unit can change the reception mode. That is, the second distributed unit may determine whether it can respond to the request received in operation 1610. The request received in operation 1610 may include information related to the computational capacity of the first distributed unit, information related to resource scheduling, and / or information related to a received signal. The second distributed unit may determine whether to transmit a response to the first distributed unit based on the information included in the request of the first distributed unit. For example, the second distributed unit may determine whether to transmit a response to the first distributed unit based on whether interference received by the first distributed unit originates from a second user terminal group associated with the second distributed unit and / or whether the second distributed unit has spare computational capacity.

[0246] Operation 1630 may represent an operation in which the second distributed unit transmits a response to the first distributed unit based on the judgment result of operation 1620. Operation 1630 may correspond to operation 960 of FIG. 9, operation 1078 of FIG. 10, operation 1178 of FIG. 11, and / or operation 1278 of FIG. 12.

[0247] Operation 1640 may represent an operation in which the second distribution unit transmits transmission strength control information to the terminals of the second group assigned to the second distribution unit. Operation 1640 may correspond to operation 1082 of FIG. 10, operation 1182 of FIG. 11, operation 1282 of FIG. 12, and / or operation 1389 of FIG. 13.

[0248] Operation 1650 may represent an operation in which the second distribution unit receives a signal with controlled transmission strength from terminals of the second group and terminals of the first group assigned to the first distribution unit. Operation 1650 may correspond to operation 1090 of FIG. 10, operation 1190 of FIG. 11, operation 1290 of FIG. 12, and / or operation 1395 of FIG. 13.

[0249] The 1660 operation may represent an operation in which the second distributed unit determines a reception mode based on a signal received in the 1650 operation.

[0250] FIG. 17 is a drawing for explaining the judgment operation of the second DU according to one embodiment of the present disclosure.

[0251] The second distributed unit performing the operations of FIG. 17 may correspond to the distributed units of FIGS. 7 to 13. The operations of FIG. 17 may be specific implementations of operation 1620 of FIG. 16. Referring to FIG. 17, a method for determining whether the reception mode of the second distributed unit can be changed may include the following operations.

[0252] A method for determining whether a second distributed unit can change its reception mode may include an operation (1710) of determining a possibility of interference between transmission signals of a second group of terminals assigned to a second distributed unit and transmission signals of a first group of terminals assigned to a first distributed unit, and an operation (1720) of determining whether the second distributed unit has spare computational power based on the determination result.

[0253] Operation 1710 may be performed by the second distributed unit based on information included in the request from the first distributed unit. The request received by the second distributed unit may include information related to the computing capacity of the first distributed unit, information related to resource scheduling, and / or information related to received signals. The second distributed unit may determine the possibility of interference based on the information included in the request from the first distributed unit.

[0254] For example, information related to resource scheduling may indicate information about resources scheduled in each distribution unit. The second distribution unit may determine whether the second distribution unit is related to interference received from the first distribution unit based on the information related to resource scheduling. If the frequency domain resources (or time domain resources) allocated to the first user terminal group associated with the first distribution unit and the frequency domain resources (or time domain resources) allocated to the second user terminal group associated with the second distribution unit are such that interference may occur, the second distribution unit may determine, based on the information related to resource scheduling, that the second user terminal group associated with the second distribution unit is related to interference signals received from the first distribution unit.

[0255] The operation 1720 may be performed based on the computational capability information of the second distributed unit when it is determined that the second distributed unit is related to the interference signal received from the first distributed unit (i.e., when it is determined that the first distributed unit receives the interference signal from the second user terminal group assigned to the second distributed unit). When the second distributed unit determines that the computational capability of the second distributed unit is sufficient, it may transmit a response to the first distributed unit. Furthermore, when the second distributed unit does not determine that the computational capability of the second distributed unit is sufficient, it may not transmit a response to the first distributed unit. Furthermore, when the second distributed unit determines that the computational capability of the second distributed unit is sufficient, it may transmit signal strength control information for increasing the transmission strength of the second user terminal group associated with the second distributed unit to the second user terminal group. Furthermore, when the second distributed unit does not determine that the computational capability of the second distributed unit is sufficient, it may not transmit signal strength control information for increasing the transmission strength of the second user terminal group associated with the second distributed unit to the second user terminal group.

[0256] FIG. 18 is a diagram for explaining the operation of a central unit (CU) according to one embodiment of the present disclosure.

[0257] The central unit performing the operations of Fig. 18 may correspond to the central unit (1370) of Fig. 13. Referring to Fig. 18, the central unit may perform the following operations.

[0258] Referring to FIG. 18, a central unit (1370) may perform an operation (1810) of receiving performance and / or scheduling information from a plurality of distributed units, an operation (1820) of receiving a performance abnormality report from a first distributed unit, an operation (1830) of selecting a second distributed unit capable of changing a reception mode, and an operation (1840) of transmitting setting information regarding terminal signal control to the first distributed unit and the second distributed unit.

[0259] In operation 1810, performance information may include information about the computational capabilities of the distributed unit or whether distributed computational capabilities are available. Scheduling information may indicate information related to resources allocated to a group of user terminals associated with the distributed unit. However, the information received by the central unit is not limited to the aforementioned information, and may further include information about whether the distributed unit lacks computational capabilities, information about error rates, information about signals measured by the distributed unit, etc.

[0260] Action 1820 may represent an action in which the central unit receives a performance abnormality report from the first distributed unit.

[0261] In one embodiment, the central unit may periodically receive performance abnormalities from the distributed units. If the central unit receives a performance abnormality report, the central unit may transmit configuration information considering the computational capabilities of the distributed units to the distributed units.

[0262] Operation 1830 represents an operation in which the central unit selects a second distributed unit capable of changing the reception mode. At this time, the operation in which the second distributed unit is selected may be performed based on the performance information and / or resource scheduling related information of the distributed units received in operation 1810. Operation 1830 may be an operation similar to the operations performed by the first distributed unit described in FIG. 15. That is, the central unit may perform the operations performed by the first distributed unit described in FIG. 15. The central unit may determine distributed units related to interference of the first distributed unit, and select a second distributed unit capable of changing the reception mode by considering the computational capability information of the determined distributed units.

[0263] The 1840 operation may represent an operation of transmitting configuration information regarding terminal signal control from the central unit to the first distributed unit and the second distributed unit. The configuration information may be determined by considering the computational capability of the first distributed unit, whether there is interference between user terminal groups assigned to the first distributed unit and the second distributed unit, etc. The configuration information may be related to transmission signal strength control of the user terminal groups for the distributed units. For example, the first distributed unit may transmit signal strength control information for increasing the transmission signal strength of the first user terminal group to the first user terminal group according to the configuration information received from the central unit, or may transmit signal strength control information for decreasing the transmission signal strength of the first user terminal group to the first user terminal group. In addition, the second distributed unit may transmit signal strength control information for increasing the transmission signal strength of the second user terminal group to the second user terminal group according to the configuration information received from the central unit, or may transmit signal strength control information for decreasing the transmission signal strength of the second user terminal group to the second user terminal group.

[0264] The first distributed unit and the second distributed unit, which have received the configuration information, can transmit signal strength control information corresponding to the configuration information to the first user terminal group and the second user terminal group, respectively. The first user terminal group and the second user terminal group can adjust the strength of the transmission signal based on the received signal strength control information. Accordingly, the ratio of interference signals in the signals received by the first distributed unit and the second distributed unit can change, and the first distributed unit and the second distributed unit can determine the reception mode appropriately for the received signal changed in this way.

[0265] According to embodiments of the present disclosure, a distributed unit of a base station can effectively change a signal reception mode by cooperating with other distributed units. By cooperating with other distributed units, the distributed unit can achieve a result in which the transmission strength of not only the user terminal group assigned to itself but also the user terminal group assigned to other distributed units is adjusted, and a different reception mode can be applied based on the changed signal reception environment. In other words, embodiments of the present disclosure can provide a novel method for resolving the problem of insufficient computational capacity or increased error rate of the distributed unit.

[0266] In addition, according to embodiments of the present disclosure, even when a virtualized distributed unit is physically separated from a radio unit and located at a remote location, there is an advantage in that the computational efficiency of the virtualized distributed units can be increased through information exchange between the virtualized distributed units.

[0267] The various embodiments of the present disclosure and the terminology used therein are not intended to limit the technical features described in the present disclosure to specific embodiments, but should be understood to include various modifications, equivalents, or substitutes of the embodiments. In connection with the description of the drawings, similar reference numerals may be used for similar or related components. The singular form of a noun corresponding to an item may include one or more items, unless the relevant context clearly indicates otherwise. In the present disclosure, each of the phrases "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 "at least one of A, B, or C" can include any one of the items listed together in the corresponding phrase among the phrases, or all possible combinations thereof. Terms such as "first," "second," or "first" or "second" may be used merely to distinguish one component from another and do not limit the components in any other respect (e.g., importance or order). When a component (e.g., a first component) is referred to as "coupled" or "connected" to another component (e.g., a second component), with or without the terms "functionally" or "communicatively," it means that the component can be connected to the other component directly (e.g., wired), wirelessly, or through a third component.

[0268] The term "module" as used herein may include a unit implemented in hardware, software, or firmware, and may be used interchangeably with terms such as logic, logic block, component, or circuit. A module may be an integrally formed component or a minimum unit or part of a component that performs one or more functions. For example, according to one embodiment, a module may be implemented in the form of an application-specific integrated circuit (ASIC).

[0269] Various embodiments of the present disclosure may be implemented as software (e.g., a program (140)) including one or more commands stored in a storage medium (e.g., an internal memory (136) or an external memory (138)) readable by a machine (e.g., an electronic device (101)). For example, a device (e.g., a processor (e.g., processor (120) of an electronic device (101)) can call at least one command from among one or more commands stored from a storage medium and execute it. This enables the device to operate to perform at least one function according to the called at least one command. The one or more commands may include code generated by a compiler or code executable by an interpreter. A storage medium readable by the 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 a signal (e.g., EM wave), and this term does not distinguish between cases where data is stored semi-permanently and cases where it is stored temporarily in the storage medium.

[0270] According to one embodiment, the method according to various embodiments disclosed in the present disclosure may be provided as included in a computer program product. The computer program product may be traded as a product between a seller and a buyer. The computer program product may be distributed in the form of a device-readable storage medium (e.g., a compact disc read-only memory (CD-ROM)), or may be distributed online (e.g., downloaded or uploaded) via an application store (e.g., Play Store™) or directly between two user devices (e.g., smartphones). In the case of online distribution, at least a portion of the computer program product may be temporarily stored or temporarily generated in a device-readable storage medium, such as the memory of a manufacturer's server, an application store's server, or an intermediary server.

[0271] According to various embodiments, each component (e.g., a module or a program) of the described components may include one or more entities. According to various embodiments, one or more components or operations of the aforementioned components may be omitted, or one or more other components or operations may be added. Alternatively or additionally, a plurality of components (e.g., a module or a program) may be integrated into a single component. In such a case, the integrated component may perform one or more functions of each of the plurality of components identically or similarly to those performed by the corresponding component among the plurality of components prior to integration. According to various embodiments, the 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, omitted, or one or more other operations may be added.

Claims

1. A method performed by a first distributed unit (DU) in a wireless communication system, A step of checking the performance abnormality of the first distribution unit; A step of determining a second distributed unit to transmit a terminal signal control request based on the above confirmation; Based on the above decision result, a step of transmitting a terminal signal control request to the second distributed unit or reporting a performance abnormality to the central unit; A step of transmitting control information for controlling the transmission strength of the terminals of the first group corresponding to the first distribution unit to the terminals of the first group; A step of receiving data signals from terminals of the first group; A step of receiving an interference signal from terminals of a second group corresponding to the second distributed unit; and A step of determining a reception mode based on the data signal and the interference signal, method.

2. In claim 1, The above method, If the terminal signal control request is transmitted to the second distributed unit, further comprising a step of receiving a response to the terminal signal control request from the second distributed unit. method.

3. In claim 1, The step of checking the performance abnormality of the above first distribution unit is: A step of checking performance abnormality based on the computational capacity of the first distributed unit is included, The step of checking the performance abnormality of the above first distribution unit is: A step of identifying a performance abnormality based on an error rate of data received from the first distribution unit, method.

4. In claim 1, The above method, Further comprising a step of receiving information about the computational capability of the second distributed unit from the second distributed unit, The step of determining the second distributed unit is based on information about the computational capability of the second distributed unit. method.

5. In claim 1, The above method, Further comprising a step of receiving information about frequency domain resources related to the second distributed unit from the second distributed unit, The step of determining the second distributed unit is based on information about frequency domain resources related to the second distributed unit. method.

6. In claim 1, The step of determining the above reception mode determines the reception mode based on the interference signal ratio and SINR (Signal to Interference to Noise ratio), The above reception mode is either a reception mode based on MMSE (Minimum Mean Square Error) or a reception mode based on MMSE-IRC (interference Rejection Combining). method.

7. In claim 1, The above control information is information for increasing the transmission strength of the terminals of the first group, The step of determining the above reception mode determines the reception mode based on MMSE (Minimum Mean Square Error), The above terminal signal control request is, Requesting the second distribution unit to transmit a control signal to the terminals of the second group to reduce the transmission strength of the terminals of the second group, method.

8. As the first distributed unit (DU) of a wireless communication system, Transmitter and receiver; and Including a processor connected to the above transceiver, The above processor: An operation to check the performance abnormality of the first distribution unit; An operation of determining a second distributed unit to transmit a terminal signal control request based on the above confirmation; Based on the above decision result, an operation of transmitting a terminal signal control request to the second distributed unit or reporting a performance abnormality to the central unit; An operation of transmitting control information for controlling the transmission strength of terminals of a first group corresponding to the first distribution unit to the terminals of the first group; An operation of receiving a data signal from terminals of the first group; An operation of receiving an interference signal from terminals of a second group corresponding to the second distributed unit; and An operation is set to perform a receiving mode determination based on the data signal and the interference signal. First distributed unit.

9. In claim 8, The above processor, When the terminal signal control request is transmitted to the second distributed unit, an operation of receiving a response to the terminal signal control request from the second distributed unit is further performed. First distributed unit.

10. In claim 8, The operation of checking the performance abnormality of the above first distribution unit is as follows: Including an operation of checking a performance abnormality based on the computational capacity of the first distributed unit, The operation of checking the performance abnormality of the above first distribution unit is as follows: Including an operation of checking for performance abnormality based on an error rate of data received from the first distribution unit. First distributed unit.

11. In claim 8, The above processor, It is further configured to perform an operation of receiving, from the second distributed unit, information about the computational capability of the second distributed unit and information about frequency domain resources related to the second distributed unit, The operation of determining the second distributed unit is based on information about the computational capability of the second distributed unit and information about frequency domain resources related to the second distributed unit. First distributed unit.

12. In claim 8, The operation of determining the above reception mode determines the reception mode based on the interference signal ratio and SINR (Signal to Interference to Noise ratio), The above reception mode is either a reception mode based on MMSE (Minimum Mean Square Error) or a reception mode based on MMSE-IRC (interference Rejection Combining). First distributed unit.

13. In claim 8, The above control information is information for increasing the transmission strength of the terminals of the first group, The step of determining the above reception mode determines the reception mode based on MMSE (Minimum Mean Square Error), The above terminal signal control request is, Requesting the second distribution unit to transmit a control signal to the terminals of the second group to reduce the transmission strength of the terminals of the second group, First distributed unit.

14. In a method performed by a second distributed unit (DU) in a wireless communication system, A step of receiving a terminal signal control request from a first distributed unit; A step of transmitting a response to the terminal signal control request to the first distributed unit; A step of transmitting control information for controlling the transmission strength of the second group of terminals corresponding to the second distribution unit to the second group of terminals; A step of receiving data signals from terminals of the second group; A step of receiving an interference signal from terminals of a first group corresponding to the first distributed unit; and A step of determining a reception mode based on the data signal and the interference signal, method.

15. A method performed by a central unit (CU) in a wireless communication system, A step of receiving a performance abnormality report from a first distributed unit (DU); A step of determining a second distributed unit to which a terminal signal control request will be transmitted based on the above performance abnormality report; A step of transmitting, to the first distribution unit, first setting information for controlling the transmission strength of the first group of terminals corresponding to the first distribution unit; and A step of transmitting, to the second distribution unit, second setting information for controlling the transmission strength of the second group of terminals corresponding to the second distribution unit, The step of determining the second distributed unit is based on information about the computational capability of the second distributed unit and information about frequency domain resources related to the second distributed unit. Central unit.

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