KR102600700B1 - Method and apparatus for signal transmission and reception in communication system - Google Patents

Abstract

In one embodiment of a communication system, a method of operating a first AP of a base station to which a distributed antenna structure is applied includes transmitting, to a control device of the base station, channel information between one or more UEs connected to the base station and the first AP; Receiving allocation information determined by the control device, based on the allocation information, decoding uplink (UL) signals of each of the one or more UEs among a plurality of APs and the control device constituting the base station. Confirming the subject, directly performing a decoding operation on a first UL signal received from a first UE among the one or more UEs based on the allocation information, and decoding the first UL signal It may include transmitting a first report related to the result to the control device.

Description

Method and device for transmitting and receiving signals in a communication system {METHOD AND APPARATUS FOR SIGNAL TRANSMISSION AND RECEPTION IN COMMUNICATION SYSTEM}

This disclosure relates to wireless signal transmission and reception technology in a communication system, and specifically, to wireless signal transmission and reception technology for improving the reception performance of uplink signals in a communication system using a distributed antenna structure.

With the advancement of information and communication technology, various wireless communication technologies are being developed. Representative wireless communication technologies include long term evolution (LTE) and new radio (NR), which are defined in the 3rd generation partnership project (3GPP) standard. LTE may be a wireless communication technology among 4G (4th Generation) wireless communication technologies, and NR may be a wireless communication technology among 5G (5th Generation) wireless communication technologies. Wireless communication technology after 5G (such as 6G (6th Generation), etc.) can be referred to as B5G (beyond 5G) wireless communication technology.

In order to improve problems such as a decrease in transmission capacity at cell boundaries or in shadows in cellular communication systems, a method of configuring a base station with a distributed antenna structure is being studied. A base station configured with a distributed antenna structure may include a plurality of distributed antennas that are spatially or geographically spaced apart from each other and a central control device. The base station can form a beam and transmit signals through a plurality of spatially distributed distributed antennas. Through a base station configured with a distributed antenna structure, the problem of transmission capacity decline at cell boundaries or shaded areas can be improved.

Meanwhile, since a base station configured with a distributed antenna structure transmits and receives signals through a plurality of spatially spaced distributed antennas, the decoding location and decoding of a plurality of uplink (UL) signals received from a plurality of users You may have difficulty deciding on a method. Additionally, if there is a limit to the fronthaul capacity between the central control device of the base station and the plurality of distributed antennas, the decoding performance of the UL signal may deteriorate. Technology to improve UL signal reception performance may be required in a base station configured with a distributed antenna structure.

The matters described in this background art section were prepared to improve understanding of the background of the present disclosure, and may include matters that are not prior art already known to those skilled in the art in the field to which this technology pertains.

The purpose of the present disclosure to achieve the above requirements is to provide a signal transmission and reception method and device for a base station configured with a distributed antenna structure in a communication system to efficiently perform decoding operations for UL signals.

In an embodiment of a communication system for achieving the above object, a method of operating a first access point (AP) of a base station to which a distributed antenna structure is applied includes, to a control device of the base station, one or more UEs connected to the base station. Transmitting channel information between (user equipment) and the first AP, receiving allocation information determined by the control device, based on the allocation information, among a plurality of APs and the control device constituting the base station Identifying a subject to decode uplink (UL) signals of each of the one or more UEs, based on the allocation information, decoding a first UL signal received from a first UE among the one or more UEs It may include performing the operation directly, and transmitting a first report related to the result of the decoding operation for the first UL signal to the control device.

Transmitting the channel information includes performing measurement on UL channels between the one or more UEs and the first AP, and generating the channel information based on the measurement results for the UL channels. , and transmitting the channel information to the control device.

The allocation information may include information instructing the first AP to decode UL signals of at least the first UE among the one or more UEs.

When the first UL signal is successfully decoded, the operating method of the first AP includes, after transmitting the first report, receiving a first request from the control device, and responding to the first request. Based on this, the method may further include transmitting the decoded first UL signal, which is a result of decoding the first UL signal, to the control device.

When the first UL signal is not successfully decoded, the operating method of the first AP includes, after transmitting the first report, receiving a second request from the control device, and the second request Based on, it further includes transmitting first information about the first UL signal to the control device, wherein the first information can be used by the control device to perform decoding on the first UL signal. there is.

The first information may correspond to information about the first UL signal itself or information about the log-likelihood ratio (LLR) for the first UL signal.

The allocation information includes information instructing the second AP of the base station to decode the UL signal of a second UE among the one or more UEs, and directly performing a decoding operation on the first UL signal includes: Receiving, from a control device, first decoding success information including information indicating that the second AP has successfully decoded the UL signal of the second UE, information about the decoding result in the second AP transmitting a third request to the control device, receiving, from the control device, information about the decoding result of the second UL signal received by the second AP from the second UE, and the second It may include performing decoding on the first UL signal based on a successive interference cancellation (SIC) operation using information about the decoding result of the UL signal.

The allocation information includes information instructing at least the first AP and the third AP of the base station to decode the UL signal of a third UE among the one or more UEs, and the operation method of the first AP includes the After the confirming step, receiving, from the control device, second decoding success information including information indicating that the third AP has successfully decoded the UL signal of the third UE, and the second decoding Based on the success information, it may further include determining that there is no need to perform decoding on the third UL signal received from the third UE.

In an embodiment of a communication system for achieving the above object, a method of operating a control device of a base station to which a distributed antenna structure is applied includes a method of operating a control device connected to the base station from a plurality of access points (APs) included in the base station. Receiving channel information between one or more user equipment (UE) and each of the plurality of APs, determining allocation information based at least on the channel information, transmitting the allocation information to at least some of the plurality of APs transmitting to, and a result of a decoding operation for an uplink (UL) signal received from a first AP among the plurality of APs, from a first UE among the one or more UEs based on the allocation information, and Receiving a related first report, wherein the allocation information may include information indicating a subject to decode UL signals of each of the one or more UEs among the plurality of APs and the control device.

The determining step may include determining the allocation information based on at least some of the channel information, network setting information, or monitoring information.

The network setting information may include information on processing capacity for each AP, and the monitoring information may include information on fronthaul capacity between the control device and the APs.

When the first report indicates successful decoding, the operating method of the control device includes, after receiving the first report, the first UE requesting transmission of the decoding result of the UL signal received from the first UE. It may further include transmitting a request to the first AP, and receiving a decoded first UL signal based on the first request.

When the first report indicates a decoding failure, the operating method of the control device includes, after receiving the first report, sending a second request requesting transmission of first information to the first AP. and receiving the first information transmitted based on the second request from the first AP, wherein the first information is configured to allow the control device to respond to a UL signal from the first UE. It can be used to perform decryption.

The allocation information includes information instructing the second AP of the base station to decode the UL signal of a second UE among the one or more UEs, and the operating method of the control device includes receiving the first report. Previously, receiving a second report from the second AP indicating that the UL signal of the second UE was successfully decoded, transmitting first decoding success information based on the second report, Receiving, from the first AP, a third request requesting information about a decoding result in the second AP, and receiving, to the first AP, a second UL received by the second AP from the second UE It further includes transmitting information about the decoding result of the signal, wherein the information about the decoding result of the second UL signal is used for the decoding operation of the UL signal received from the first UE in the first AP. It can be used in SIC (successive interference cancellation) operations.

The allocation information includes information instructing at least the first AP and the third AP of the base station to decode the UL signal of a third UE among the one or more UEs, and the operating method of the control device includes the transmission After the step, receiving a third report from the third AP indicating that the UL signal of the first UE has been successfully decoded, and based on the third report, providing at least second decoding success information. It may further include transmitting to the first AP.

According to an embodiment of a method and apparatus for transmitting and receiving signals in a communication system, a decoding operation for each UL signal from UEs at a base station configured with a distributed antenna structure in a communication system is performed using a control device (CPU, etc.) and a plurality of distributed It can be performed based on a specific entity among APs.

According to an embodiment of a method and apparatus for transmitting and receiving signals in a communication system, the decoding subject (decoding location) for each of the UL signals can be determined through a simple signaling procedure between the control device and a plurality of distributed APs in the communication system. , UL signals can be decoded efficiently. As a result, UL signal reception performance can be improved in a base station configured with a distributed antenna structure.

1 is a conceptual diagram illustrating an embodiment of a communication system.
Figure 2 is a block diagram showing an embodiment of a communication node constituting a communication system.
Figure 3 is a conceptual diagram to explain an embodiment of a communication system to which a distributed antenna structure is applied.
FIG. 4 is a conceptual diagram illustrating an embodiment of uplink transmission and reception operations in a communication system to which a distributed antenna structure is applied.
Figure 5 is a conceptual diagram to explain an embodiment of a base station to which a distributed antenna structure is applied in a communication system.
Figure 6 is a flowchart for explaining a first embodiment of a method for receiving an uplink signal in a communication system.
Figure 7 is a flowchart for explaining a second embodiment of a method for receiving an uplink signal in a communication system.
Figure 8 is a flowchart for explaining a third embodiment of a method for receiving an uplink signal in a communication system.
Figure 9 is a flowchart for explaining a fourth embodiment of a method for receiving an uplink signal in a communication system.

Since the present disclosure can make various changes and have various embodiments, specific embodiments will be illustrated in the drawings and described in detail. However, this is not intended to limit the present disclosure to specific embodiments, and should be understood to include all changes, equivalents, and substitutes included in the spirit and technical scope of the present disclosure.

Terms such as first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The above terms are used only for the purpose of distinguishing one component from another. For example, a first component may be referred to as a second component, and similarly, the second component may be referred to as a first component without departing from the scope of the present disclosure. The term and/or includes any of a plurality of related stated items or a combination of a plurality of related stated items.

When a component is said to be "connected" or "connected" to another component, it is understood that it may be directly connected to or connected to the other component, but that other components may exist in between. It should be. On the other hand, when it is mentioned that a component is “directly connected” or “directly connected” to another component, it should be understood that there are no other components in between.

The terms used in this disclosure are only used to describe specific embodiments and are not intended to limit the disclosure. Singular expressions include plural expressions unless the context clearly dictates otherwise. In the present disclosure, terms such as “comprise” or “have” are intended to designate the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, but are not intended to indicate the presence of one or more other features. It should be understood that this does not exclude in advance the possibility of the existence or addition of elements, numbers, steps, operations, components, parts, or combinations thereof.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by a person of ordinary skill in the technical field to which this disclosure pertains. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related technology, and unless clearly defined in the present disclosure, should not be interpreted in an idealized or excessively formal sense. No.

A communication system to which embodiments according to the present disclosure are applied will be described. Communication systems to which embodiments according to the present disclosure are applied are not limited to those described below, and embodiments according to the present disclosure can be applied to various communication systems. Here, communication system may be used in the same sense as communication network.

Throughout the specification, network refers to, for example, wireless Internet such as WiFi (wireless fidelity), mobile Internet such as WiBro (wireless broadband internet) or WiMax (world interoperability for microwave access), and GSM (global system for mobile communication). ) or 2G mobile communication networks such as CDMA (code division multiple access), 3G mobile communication networks such as WCDMA (wideband code division multiple access) or CDMA2000, HSDPA (high speed downlink packet access) or HSUPA (high speed uplink packet access) It may include 4G mobile communication networks such as 3.5G mobile communication networks, LTE (long term evolution) networks or LTE-Advanced networks, 5G mobile communication networks, B5G mobile communication networks (6G mobile communication networks, etc.).

Throughout the specification, terminal refers to a mobile station, mobile terminal, subscriber station, portable subscriber station, user equipment, and access terminal. It may refer to the like, and may include all or part of the functions of a terminal, a mobile station, a mobile terminal, a subscriber station, a portable subscriber station, a user device, an access terminal, etc.

Here, a desktop computer, laptop computer, tablet PC, wireless phone, mobile phone, smart phone, and smart watch that can communicate with terminals. (smart watch), smart glass, e-book reader, PMP (portable multimedia player), portable game console, navigation device, digital camera, DMB (digital multimedia broadcasting) player, digital voice digital audio recorder, digital audio player, digital picture recorder, digital picture player, digital video recorder, digital video player ), etc. can be used.

Throughout the specification, base station refers to an access point, radio access station, node B, evolved node B, base transceiver station, and MMR ( It may refer to a mobile multihop relay)-BS, etc., and may include all or part of the functions of a base station, access point, wireless access station, Node B, eNodeB, transmitting and receiving base station, and MMR-BS.

Hereinafter, preferred embodiments of the present disclosure will be described in more detail with reference to the attached drawings. In order to facilitate overall understanding in explaining the present disclosure, the same reference numerals are used for the same components in the drawings, and duplicate descriptions of the same components are omitted.

1 is a conceptual diagram illustrating an embodiment of a communication system.

Referring to FIG. 1, the communication system 100 includes a plurality of communication nodes 110-1, 110-2, 110-3, 120-1, 120-2, 130-1, 130-2, 130-3, 130-4, 130-5, 130-6). A plurality of communication nodes are 4G communication (e.g., long term evolution (LTE), LTE-A (advanced)), 5G communication (e.g., new radio (NR)) specified in the 3rd generation partnership project (3GPP) standard. ), etc. can be supported. 4G communications can be performed in frequency bands below 6 GHz, and 5G communications can be performed in frequency bands above 6 GHz as well as below 6 GHz.

For example, for 4G communication and 5G communication, a plurality of communication nodes may use a communication protocol based on code division multiple access (CDMA), a communication protocol based on wideband CDMA (WCDMA), a communication protocol based on time division multiple access (TDMA), Communication protocol based on FDMA (frequency division multiple access), communication protocol based on OFDM (orthogonal frequency division multiplexing), communication protocol based on Filtered OFDM, communication protocol based on CP (cyclic prefix)-OFDM, DFT-s-OFDM (discrete Fourier transform-spread-OFDM)-based communication protocol, OFDMA (orthogonal frequency division multiple access)-based communication protocol, SC (single carrier)-FDMA-based communication protocol, NOMA (Non-orthogonal Multiple Access), GFDM (generalized frequency) division multiplexing)-based communication protocols, FBMC (filter bank multi-carrier)-based communication protocols, UFMC (universal filtered multi-carrier)-based communication protocols, and SDMA (Space Division Multiple Access)-based communication protocols. .

Additionally, the communication system 100 may further include a core network. If the communication system 100 supports 4G communication, the core network may include a serving-gateway (S-GW), a packet data network (PDN)-gateway (P-GW), a mobility management entity (MME), etc. there is. When the communication system 100 supports 5G communication, the core network may include a user plane function (UPF), a session management function (SMF), and an access and mobility management function (AMF).

Meanwhile, a plurality of communication nodes (110-1, 110-2, 110-3, 120-1, 120-2, 130-1, 130-2, 130-3, 130-) constituting the communication system 100 4, 130-5, 130-6) Each can have the following structure.

Figure 2 is a block diagram showing an embodiment of a communication node constituting a communication system.

Referring to FIG. 2, the communication node 200 may include at least one processor 220, a memory 220, and a transmitting and receiving device 230 that is connected to a network and performs communication. Additionally, the communication node 200 may further include an input interface device 240, an output interface device 250, a storage device 260, etc. Each component included in the communication node 200 is connected by a bus 270 and can communicate with each other.

However, each component included in the communication node 200 may be connected through an individual interface or individual bus centered on the processor 220, rather than the common bus 270. For example, the processor 220 may be connected to at least one of the memory 220, the transmission and reception device 230, the input interface device 240, the output interface device 250, and the storage device 260 through a dedicated interface. .

The processor 220 may execute a program command stored in at least one of the memory 220 and the storage device 260. The processor 220 may refer to a central processing unit (CPU), a graphics processing unit (GPU), or a dedicated processor on which methods according to embodiments of the present disclosure are performed. Each of the memory 220 and the storage device 260 may be comprised of at least one of a volatile storage medium and a non-volatile storage medium. For example, the memory 220 may be comprised of at least one of read only memory (ROM) and random access memory (RAM).

Referring again to FIG. 1, the communication system 100 includes a plurality of base stations (110-1, 110-2, 110-3, 120-1, 120-2) and a plurality of terminals (130- 1, 130-2, 130-3, 130-4, 130-5, 130-6). Base stations (110-1, 110-2, 110-3, 120-1, 120-2) and terminals (130-1, 130-2, 130-3, 130-4, 130-5, 130-6) The communication system 100 that includes may be referred to as an “access network.” Each of the first base station 110-1, the second base station 110-2, and the third base station 110-3 may form a macro cell. Each of the fourth base station 120-1 and the fifth base station 120-2 may form a small cell. The fourth base station 120-1, the third terminal 130-3, and the fourth terminal 130-4 may belong to the cell coverage of the first base station 110-1. The second terminal 130-2, the fourth terminal 130-4, and the fifth terminal 130-5 may belong to the cell coverage of the second base station 110-2. The fifth base station 120-2, the fourth terminal 130-4, the fifth terminal 130-5, and the sixth terminal 130-6 may belong to the cell coverage of the third base station 110-3. there is. The first terminal 130-1 may belong to the cell coverage of the fourth base station 120-1. The sixth terminal 130-6 may belong to the cell coverage of the fifth base station 120-2.

Here, each of the plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2 includes a NodeB, an evolved NodeB, a base transceiver station (BTS), Radio base station, radio transceiver, access point, access node, road side unit (RSU), radio remote head (RRH), transmission point (TP), TRP ( transmission and reception point), eNB, gNB, etc.

A plurality of terminals (130-1, 130-2, 130-3, 130-4, 130-5, and 130-6) each include a user equipment (UE), a terminal, an access terminal, and a mobile device. Terminal, station, subscriber station, mobile station, portable subscriber station, node, device, IoT (Internet of Thing) It may be referred to as a device, a mounted device (mounted module/device/terminal or on board device/terminal, etc.), etc.

Meanwhile, each of the plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2 may operate in different frequency bands or may operate in the same frequency band. Each of the plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2 may be connected to each other through an ideal backhaul link or a non-ideal backhaul link. , information can be exchanged with each other through an ideal backhaul link or a non-ideal backhaul link. Each of the plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2 may be connected to the core network through an ideal backhaul link or a non-ideal backhaul link. Each of the plurality of base stations (110-1, 110-2, 110-3, 120-1, 120-2) transmits the signal received from the core network to the corresponding terminal (130-1, 130-2, 130-3, 130). -4, 130-5, 130-6), and the signal received from the corresponding terminal (130-1, 130-2, 130-3, 130-4, 130-5, 130-6) is sent to the core network. can be transmitted to.

In addition, each of the plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2 performs MIMO transmission (e.g., single user (SU)-MIMO, multi user (MU)- MIMO, massive MIMO, etc.), coordinated multipoint (CoMP) transmission, carrier aggregation (CA) transmission, transmission in an unlicensed band, direct device to device communication (D2D) (or ProSe ( proximity services)), etc. can be supported. Here, each of the plurality of terminals 130-1, 130-2, 130-3, 130-4, 130-5, and 130-6 is connected to a base station 110-1, 110-2, 110-3, and 120-1. , 120-2) and operations corresponding to those supported by the base stations 110-1, 110-2, 110-3, 120-1, and 120-2. For example, the second base station 110-2 may transmit a signal to the fourth terminal 130-4 based on the SU-MIMO method, and the fourth terminal 130-4 may transmit a signal to the fourth terminal 130-4 based on the SU-MIMO method. A signal can be received from the second base station 110-2. Alternatively, the second base station 110-2 may transmit a signal to the fourth terminal 130-4 and the fifth terminal 130-5 based on the MU-MIMO method, and the fourth terminal 130-4 and the fifth terminal 130-5 can each receive a signal from the second base station 110-2 by the MU-MIMO method.

Each of the first base station 110-1, the second base station 110-2, and the third base station 110-3 may transmit a signal to the fourth terminal 130-4 based on the CoMP method, and the fourth terminal 130-4 may transmit a signal to the fourth terminal 130-4. The terminal 130-4 can receive signals from the first base station 110-1, the second base station 110-2, and the third base station 110-3 using the CoMP method. Each of a plurality of base stations (110-1, 110-2, 110-3, 120-1, 120-2) has a terminal (130-1, 130-2, 130-3, 130-4) within its cell coverage. , 130-5, 130-6), and signals can be transmitted and received based on the CA method. The first base station 110-1, the second base station 110-2, and the third base station 110-3 each control D2D between the fourth terminal 130-4 and the fifth terminal 130-5. and each of the fourth terminal 130-4 and the fifth terminal 130-5 can perform D2D under the control of each of the second base station 110-2 and the third base station 110-3. .

Next, methods for transmitting and receiving signals in a communication system will be described. Here, even when a method performed in a first communication node among the communication nodes (e.g., transmission or reception of a signal) is described, the corresponding second communication node is a method corresponding to the method performed in the first communication node. (For example, receiving or transmitting a signal) can be performed. For example, when the operation of a receiving node is described, the corresponding transmitting node may perform an operation corresponding to the operation of the receiving node. Conversely, when the operation of a transmitting node is described, the corresponding receiving node may perform an operation corresponding to the operation of the transmitting node.

Figure 3 is a conceptual diagram to explain an embodiment of a communication system to which a distributed antenna structure is applied.

Referring to FIG. 3, the communication system 300 may correspond to a distributed antenna system (DAS) to which a distributed antenna structure is applied. A base station of a distributed antenna system may include a plurality of distributed antennas that are spatially or geographically spaced apart from each other. A base station can transmit and receive signals or beams through a plurality of distributed antennas distributed and spaced apart spatially. A distributed antenna system may refer to a communication system in contrast to a centralized antenna system (Central Antenna System, CAS) in which a base station and its transmitting and receiving antennas are located at the center of each cell. In a distributed antenna system, the antennas of the base station are distributed evenly in the service area of the cell, allowing the base station to provide improved mobile communication services compared to the centralized antenna system.

The communication system 300 may include one or more control devices 310 and one or more antennas 320-1, 320-2, ..., 320-n. Here, the number n of antennas may be a natural number of 1 or more. Communication system 300 may correspond to or include a base station. In Figure 3, there is one base station in the communication system 300, and the base station includes one control device 310 and a plurality of antennas 320-1, 320-2, ..., 320-n. An example is shown. However, this is only an example for convenience of explanation, and the embodiment of the communication system is not limited to this. For example, an embodiment of a communication system to which a distributed antenna structure is applied may include an embodiment in which a plurality of base stations exist in the communication system, an embodiment in which the base station includes a plurality of control devices, or an embodiment in which the base station includes one antenna. The same or similar application may be applied to various embodiments of the system.

The base station of the communication system 300 includes one or more antennas (320-1, 320-2, ... , 320-n). The base station of the communication system 300 communicates with one or more communication nodes 330-1, 330-2, . .., 330-n) communication can be performed. For example, one or more antennas (320-1, 320-2, ..., 320-n) each correspond to one or more terminals (330-1, 330-2, ..., 320-n) existing within a predetermined communication area. ., 330-n), signal transmission and reception can be performed.

The control device 310 may be connected to one or more antennas 320-1, 320-2, ..., 320-n by wire or wirelessly. The control device 310 may control signal transmission and reception operations in one or more antennas 320-1, 320-2, ..., 320-n. The control device 310 uses one or more antennas 320-1, 320-2, ..., 320-n to control signal transmission and reception operations in the one or more antennas 320-1, 320-2, ..., 320-n. ..., 320-n) and control signals can be transmitted and received. The control device 310 transmits a transmission signal to be transmitted to one or more terminals 330-1, 330-2, ..., 330-n through one or more antennas 320-1, 320-2, ... , 320-n). The control device 310 connects one or more antennas (320-1, 320-2, ..., 320-n) to one or more terminals (330-1, 330-2, ..., 330-n). The received signal may be received from one or more antennas 320-1, 320-2, ..., 320-n.

The control device 310 may correspond to a central processing unit (CPU) that controls the overall operation of the base station. Alternatively, the control device 310 may correspond to a higher-level device including a CPU. The control device 310 and one or more antennas 320-1, 320-2, ..., 320-n may function like one node. Alternatively, the control device 310 and one or more antennas 320-1, 320-2, ..., 320-n may function as a plurality of mutually distinct nodes.

For example, in one embodiment of the communication system, the communication system 300 may be configured according to a function split method. Here, the control device 310 may correspond to a central unit (CU) that performs the functions of upper layers of the base station. Meanwhile, one or more antennas 320-1, 320-2, ..., 320-n are antennas included in a distributed unit (DU) that performs the function of the lower layers of the base station. It may apply to Meanwhile, in another embodiment of the communication system, the communication system 300 may be configured according to a cooperative MIMO (CO-nIMO) scheme to support cooperative transmission (or cooperative transmission and reception) between multiple cells. Alternatively, the communication system 300 may be configured according to a cell-free massive multi-input multi-output (CF-nIMO) (MIMO) scheme. Here, the control device 310 may correspond to a centralized processor (CP) for controlling cooperative transmission and reception between multiple cells. Meanwhile, one or more antennas 320-1, 320-2, ..., 320-n correspond to antennas included in access nodes (ANs) that perform cooperative transmission and reception under the control of the CP. can do. However, this is only an example for convenience of explanation, and the embodiment of the communication system is not limited to this and may be applied equally or similarly to various types of communication systems.

FIG. 4 is a conceptual diagram illustrating an embodiment of uplink transmission and reception operations in a communication system to which a distributed antenna structure is applied.

Referring to FIG. 4, the communication system 400 includes one or more UEs (UE-1, UE-2, ..., UE-K) and one or more APs (AP-1, AP-2, ... , AP-M). One or more APs may form a base station with a distributed antenna structure. The number K of one or more UEs and the number M of one or more APs may be a natural number of 1 or more. K and M may be the same or different from each other. The communication system 400 may be the same or similar to the communication system described with reference to FIG. 1 . Each of the one or more UEs and one or more APs may be the same or similar to some of the communication nodes described with reference to FIG. 1 . One or more UEs and one or more APs may be the same or similar to the communication node 200 described with reference to FIG. 2.

One or more wireless channels (H ₁₁ , ..., H _1K , H ₂₁ , ..., H _MK ) may be formed between one or more UEs and one or more APs. One or more UEs may transmit one or more transmission signals (X ₁ , X ₂ , ..., X _K ) through one or more wireless channels. One or more APs may acquire one or more received signals (Y ₁ , Y ₂ , ..., Y _M ) based on wireless signals received through one or more wireless channels.

When the number of UEs and/or APs present in the communication system 400 is plural (i.e., when K and/or M are greater than 1), the plurality of UEs and/or the plurality of APs act as sources of interference with each other. It can work. For example, when UE-1 wants to transmit a wireless signal to AP-1 through channel H ₁₁ , the wireless signal transmitted from UE-2 to UE-K through wireless channels H ₁₂ to H _1K may act as interference. . Expressed differently, interference may occur due to communication between a plurality of communication nodes. This kind of interference phenomenon causes problems such as a decrease in the transmission rate between each communication node in the communication system, a signal transmitted from the transmitting end not being properly received at the receiving end, or a signal that was not transmitted from the transmitting end appearing to be received at the receiving end. can occur.

For _example , when multiple UEs simultaneously transmit transmission signals (X _{1 ,} X ₂ , ..., It can be expressed the same or similar to Equation 1.

In Equation 1, H _mk may mean a channel between the kth UE (ie, UE-k) and the mth AP (ie, AP-m). X _k may mean a UL signal transmitted by UE-k. N _m may refer to the noise component occurring in AP-m. If AP-m wants to decode the UL signal received from the j-th UE (i.e., UE-j) _, Equation 1 is obtained by separating the component (H _mj It can be expressed as Equation 2.

In Equation 2, the sum of UL data from the remaining UEs except UE-j ( Term), the sum of other users' data can be viewed as an interference component. Interference components may cause performance degradation in the decoding operation of the received signal. In an environment as shown in FIG. 4, APs can decode UL signals transmitted from UEs by applying appropriate reception and decoding techniques. For example, maximum likelihood (ML) technique, minimum mean square error (MMSE) technique, zero focusing (ZF) technique, etc. may be applied.

Channel information (e.g., UL channel information) may be used in the UL received signal decoding operation at APs. UL channel information between UEs and APs may be measured based on a UL pilot signal, sounding reference signal (SRS), etc. at each AP. At least some of the channel information of each channel (eg, long-term channel gain value information) can be recognized by each AP and the CPU together. The CPU may determine and/or allocate UEs to be supported by each AP based on information on channel gain values between each AP and UEs.

Figure 5 is a conceptual diagram to explain an embodiment of a base station to which a distributed antenna structure is applied in a communication system.

Referring to FIG. 5, a base station 500 to which a distributed antenna structure is applied may include a control device 501 and one or more antennas. The base station 500 may be the same or similar to the base station described with reference to FIG. 3. The control device 501 and one or more antennas may be the same or similar to the control device 310 and one or more antennas 320-1, 320-2, ..., 320-n described with reference to FIG. 3. . For example, the communication system may include a base station 500 to which a distributed antenna structure is applied. The base station includes one or more antennas located at one or more access points (APs) (502-1, 502-2, ..., 502-M) distributed at intervals greater than a preset distance in space. can do. The control device 501 may correspond to a central processing unit (CPU) that controls and processes signal transmission and reception operations in one or more APs 502-1, 502-2, ..., 502-M. The CPU 501 controls signal transmission and reception operations in the one or more APs 502-1, 502-2, ..., 502-M. .., 502-M) and control signals can be transmitted and received.

Each of one or more APs 502-1, 502-2, ..., 502-M may be connected to another communication node through an antenna. APs 502-1, 502-2, ..., 502-M may perform channel measurement on a channel formed between a connected communication node. APs 502-1, 502-2, ..., 502-M may each acquire channel information based on the results of channel measurement. Here, the channel information may include DL channel information, UL channel information, etc. APs 502-1, 502-2, ..., 502-M may transmit the acquired channel information to the control device 501.

The control device 501 may obtain channel information 510 from the APs 502-1, 502-2, ..., 502-M. The control device 501 controls each of one or more UL signals received from one or more UEs based on the channel information 510 obtained from the APs 502-1, 502-2, ..., 502-M. A subject to decode (hereinafter referred to as 'UL signal decoding subject') may be determined or assigned. The control device 501 may further refer to the network setting information 511 and monitoring information 512 along with the channel information 510 to determine the UL signal decoding entity. Channel information 510 may include UL channel information between APs 502-1, 502-2, ..., 502-M and one or more UEs. UL channel information may include, for example, channel quality information (CQI), channel state information (CSI), interference measurement (CSI-IM), signal-to-interference-plus-noise ratio (SINR), etc. Network configuration information 511 may include information related to configuration of APs 502-1, 502-2, ..., 502-M. The network setting information 511 may include, for example, information about processing capacity for each AP, information about decoding ability for each AP, etc. The network configuration information 511 may include information about the number of antennas for each AP, information about the number of analog-to-digital converter (ADC) bits for each AP, etc. Monitoring information 512 may include, for example, information about fronthaul capacity and information about traffic load. Network setting information 511 and monitoring information 512 may be included in network status information. In addition to network setting information 511 and monitoring information 512, network situation information may further include important information for management of networks, base stations, APs, etc.

The control device 501 may determine information on the allocation result of the UL signal decoding subject for each UE (hereinafter referred to as 'allocation information' 515) based on at least part of the channel information 510 and network situation information. Allocation information 515 can also be viewed as indicating that each UE is assigned to a specific decoding entity. If network status information does not exist, the control device 501 may determine allocation information 515 based on channel information 510.

The control device 501 may transmit the determined allocation information 515 to at least some of the APs 502-1, 502-2, ..., 502-M. The control device 501 may transmit allocation information 515 to all APs 502-1, 502-2, ..., 502-M. Alternatively, the control device 501 may transmit the allocation information 515 only to the AP determined to be the UL signal decoder among the APs 502-1, 502-2, ..., 502-M. Alternatively, if the subject of UL signal decoding is determined to be the control device 501 itself, the control device 501 may not transmit the allocation information 515.

Specifically, the control device 501 may manage the channel information 510 obtained from the APs 502-1, 502-2, ..., 502-M in the same or similar form as Table 1. .

Meanwhile, the control device 501 may determine allocation information 515 in the same or similar form as Table 2.

Referring to Table 2, the control device 501 restores the UL signal of a specific UE for each of the APs 502-1, 502-2, ..., 502-M, based on the channel information 510, etc. You can determine whether this is possible. Additionally, the control device may determine the most efficient UL signal decoding entities (in other words, UL signal decoding positions) based on the network setting information 511, monitoring information 512, etc. If it is determined that the processing capacity, fronthaul burden, etc. are similar for each of the APs (502-1, 502-2, ..., 502-M), the control device 501 transmits the UL signal as shown in Table 2. UL signal decoding positions can be determined so that the decoding burden for the devices is equally allocated.

For example, the control device 501 controls UE-1 and UE-2 based on at least some of the channel information 510, network setting information 511, and monitoring information 512 configured in the same or similar form as Table 1. And it is possible to determine the subject (APs and/or control device) that can perform decoding of UL signals from UE-3.

Here, the control device 501 may determine that AP-2 and AP-1 can successfully decode the UL signals from UE-3 and UE-2. Here, if it is determined that the processing capacity, fronthaul burden, etc. for AP-2 and AP-1 are similar (or do not differ by more than a certain degree), the control device 501 is the same or similar to that shown in Table 2. Thus, AP-2 and AP-1 may decide to perform decoding for UE-3 and UE-2, respectively. Expressed differently, the control device 501 includes information instructing AP-2 to decode the UL signal from UE-1, and/or information instructing AP-3 to decode the UL signal from UE-2. Allocation information 515 can be determined. The allocation information 515 is the control device 501 that sends the decoded signal (or decoded data) to the control device 501 after AP-2 and AP-1 perform decoding on the UL signals from UE-3 and UE-2. It may further include information instructing to transmit to .

Meanwhile, the control device 501 may determine that it is not easy for APs to decode the UL signal from UE-1. In this case, the control device 501 may decide to perform decoding of the UL signal from UE-1 on its own. In this case, the allocation information 515 may further include information indicating that the control device 501 will decode the UL signal from UE-1. The allocation information 515 may further indicate the type of information to be transmitted by the APs to the control device 501 so that the control device 501 can decode the UL signal from UE-1. For example, the allocation information 515 may instruct APs to transmit LLR data (or LLR information) for the UL signal received from UE-1 to the control device 501. Alternatively, the allocation information 515 may instruct the APs to transmit the UL signal itself received from UE-1 to the control device 501. Information transmitted by APs to the control device 501 so that the control device 501 can decode the UL signal from UE-1 may hereinafter be referred to as 'partial UL data'.

Meanwhile, when the control device 501 determines that some of the APs (502-1, 502-2, ..., 502-M) have insufficient processing capacity or that the fronthaul burden is excessive, the corresponding AP is UL You may decide not to perform decoding on the signal. For example, if it is determined that there is a problem (link instability or insufficient fronthaul capacity, etc.) in the fronthaul between AP-1 (502-1) and the control device 501, the allocation information determined by the control device 501 ( 515) can be changed from the form shown in Table 2 to the form shown in Table 3.

Referring to Table 3, even if AP-1 successfully decodes the UL signal from UE-2, if there is a problem related to fronthaul, it may not be easy for the control device 501 to receive the decoded data from AP-1. You can. In this case, the control device 501 may determine allocation information 515 so that AP-2, not AP-1, performs decoding of the UL signal from UE-2.

Meanwhile, in one embodiment of the communication system 500, the allocation information 515 may instruct a plurality of entities to perform decoding of the UL signal of a specific UE. For example, the control device 501 may determine the allocation information 515 in the same or similar form as Table 4.

Referring to Table 4, allocation information 515 may instruct AP-1 and AP-2 to perform or attempt to decode the UL signal of UE-2.

Figure 6 is a flowchart for explaining a first embodiment of a method for receiving an uplink signal in a communication system.

Referring to FIG. 6, communication system 600 may include one or more UEs and one or more base stations. At least some of the one or more base stations may be configured with a distributed antenna structure. A base station configured with a distributed antenna structure may include a plurality of APs that receive wireless signals through a plurality of antennas, and one or more control devices. Each of one or more control devices may also be referred to as 'CPU'. In other words, the configurations described for the CPU in FIG. 6 may be applied equally or similarly to one or more control devices. In Figure 6, the communication system 600 includes one base station and a plurality of UEs (603-1, ..., 603-K) to which a distributed antenna structure is applied, and one base station includes one CPU (601) and A case including a plurality of APs 602-1, ..., 602-M can be seen as shown as an example. However, this is only an example for convenience of explanation, and the first embodiment of the method for receiving an uplink signal is not limited to this. In the communication system 600, one base station, one CPU 601, and a plurality of APs 602-1, ..., 602-M, the base station 500 described with reference to FIG. 5, one control It may be the same or similar to the device 501 and the plurality of APs 502-1, ..., 502-M. Hereinafter, in describing the first embodiment of the uplink signal reception method with reference to FIG. 6, content that is the same or similar to that described with reference to FIGS. 1 to 5 may be omitted.

In one embodiment of the communication system 600, APs 602-1, ..., 602-M may transmit channel information to the CPU 601 (S610). The channel information transmitted in step S610 may be the same or similar to the channel information 510 described with reference to FIG. 5. The CPU 601 may receive channel information from the APs 602-1, ..., 602-M (S610).

The CPU 601 may determine allocation information based on the channel information received at least in step S610 (S612). The allocation information determined by the CPU 601 in step S612 may be the same or similar to the allocation information 515 described with reference to FIG. 5 . The operation of the CPU 601 determining allocation information in step S612 may be the same or similar to the operation of the control device 501 determining allocation information 515 described with reference to FIG. 5 . The CPU 601 may determine allocation information based on at least some of the channel information or network situation information received in step S610. The allocation information determined in step S612 may indicate subjects (APs and/or CPUs) that will decode the UL signal from each of the UEs 603-1, ..., 603-K of the communication system 600. You can. The allocation information determined in step S612 may include information on the corresponding decoding method for each UE or information on the corresponding decoding method for each decoding subject. Allocation information may be configured in the same or similar form as shown in Tables 2 and 3 described with reference to FIG. 5 .

The CPU 601 may transmit the determined allocation information to the APs 602-1, ..., 602-M (S615). In step S615, the CPU 601 may transmit allocation information to all APs 602-1, ..., 602-M. Alternatively, in step S615, the CPU 601 may transmit allocation information to some of the APs 602-1, ..., 602-M. For example, the CPU 601 may transmit allocation information to at least some of the APs 602-1, ..., 602-M indicated by the allocation information.

At least some of the APs 602-1, ..., 602-M may receive allocation information from the CPU 601 (S615). At least some of the APs 602-1, ..., 602-M may check the received allocation information. At least some of the APs 602-1, ..., 602-M may check the UE assigned to them based on the assignment information. In other words, among the APs 602-1, ..., 602-M, APs indicated by allocation information can identify one or more UEs that will be responsible for decoding the UL signal. Alternatively, at least some of the APs 602-1, ..., 602-M provide information to be transmitted to the CPU 601 (i.e., You can check the type of partial UL data).

At least some of the UEs 603-1, ..., 603-K may transmit UL signals (S620). At least some of the APs 602-1, ..., 602-M may receive the UL signal (S620). At least some of the APs that received the UL signal may perform decoding. For example, AP-1 (602-1) may perform decoding of UL signals of one or more UEs assigned to AP-1 (S625-1). The AP-M (602-M) may perform decoding on UL signals of one or more UEs assigned to it (S625-M).

At least some of the APs 602-1, ..., 602-M may transmit UL data or partial UL data to the CPU 601 (S630). In addition, at least some of the APs 602-1, ..., 602-M provide feedback (e.g., ACK, NACK, HARQ-ACK, HARQ) to the UEs 603-1, ..., 603-K. -NACK) can be transmitted (S635). The CPU 601 may receive UL data or partial UL data in step S630. If the CPU 601 receives UL data decoded based on the UL signal from a specific UE in step S630, it can be considered that the base station has normally received the corresponding UL signal. If the CPU 601 receives partial UL data related to a UL signal from a specific UE in step S630, the CPU 601 may perform decoding based on the received partial UL data (S640). The CPU 601 may transmit feedback (e.g., ACK, NACK, HARQ-ACK, HARQ-NACK) to the corresponding UE based on the decoding result in step S640 (S645).

The operations described with reference to FIG. 6 are merely examples for convenience of explanation, and the first embodiment of the method for receiving an uplink signal in a communication system is not limited thereto. For example, the first embodiment of the method for receiving an uplink signal in a communication system may be flexibly changed, modified, and applied based on the number of APs, the number of UEs, fronthaul capacity status, CPU operation policy, etc. At least some of the operations described with reference to FIG. 6 will be described in more detail with reference to FIGS. 7 to 9 below.

Figure 7 is a flowchart for explaining a second embodiment of a method for receiving an uplink signal in a communication system.

Referring to FIG. 7 , the communication system 700 may be the same or similar to the communication system 600 described with reference to FIG. 6 . One base station, one CPU 701, and a plurality of APs 702-1, ..., 702-M included in the communication system 700 include the base station, one CPU ( 601) and a plurality of APs 602-1, ..., 602-M. Hereinafter, in describing the second embodiment of the uplink signal reception method with reference to FIG. 7, content that is the same or similar to that described with reference to FIGS. 1 to 6 may be omitted.

In one embodiment of the communication system 700, the CPU 701 and the APs 702-1, ..., 702-M constituting the base station are the same as steps S610 to S615 described with reference to FIG. 6, or Similar operations can be performed. In one embodiment of the communication system 700, UEs 703-1, ..., 703-K and APs 702-1, ..., 702-M perform a UL signal transmission and reception procedure (S720) and decoding procedures (S725-1, S725-M) can be performed. The operations according to steps S720, S725-1, and S725-M may be the same or similar to the operations according to steps S620, S625-1, and S625-M described with reference to FIG. 6.

In one embodiment of the communication system 700, allocation information determined by the CPU 701 may instruct AP-1 (702-1) to decode the UL signal of UE-1 (703-1). AP-1 (702-1) can decode the UL signal (hereinafter, first UL signal) received from UE-1 (703-1) (S725-1). AP-1 (702-1) can determine whether the decoding operation in step S725-1 has been successfully performed. For example, if the decoding result passes a cyclic redundancy check (CRC), AP-1 (702-1) may determine that the decoding operation has been successfully performed.

In one embodiment of communication system 700, AP-1 702-1 may succeed in decoding UL signals received from UE-1, UE-4, and UE-5. In this way, when the AP successfully decodes the UL signal from one or more specific UEs, the one or more UEs may be referred to as 'decoded UE' or 'decoded UEs'.

AP-1 (702-1) may transmit a decryption success report to the CPU (701) (S730). The decryption success report may include the same or similar information as Table 5, for example.

CPU 701 may receive a decoding success report from AP-1 702-1 (S730). The CPU 701 may configure decoding success information based on information included in the decoding success report received from AP-1 (702-1). The decryption success information may be configured the same or similar to the decryption success report. The decryption success information may be configured to include at least some of the information included in the decryption success report. The CPU 701 may transmit the configured decoding success information to at least some of the APs 702-1, ..., 702-M (S735).

For example, the CPU 701 may transmit decoding success information to all APs 702-1, ..., 702-M. Alternatively, the CPU 701 may transmit decryption success information to the remaining APs except AP-1 (702-1), which transmitted a decryption success report corresponding to the decryption success information. By transmitting decoding success information to APs, the CPU 701 can prevent other APs from attempting to decode a UL signal that has already been successfully decoded by a specific AP. As a result, the decoding operation (or decoding operation) can be prevented from being performed unnecessarily, and the complexity of the uplink signal reception operation can be reduced.

If the CPU 701 receives a decoding success report from a plurality of APs, the CPU 701 may configure the decoding success information the same or similar to Table 6.

The CPU 701 may request decrypted data (hereinafter referred to as first data) from at least some of the APs that have transmitted a decryption success report. For example, the CPU 701 may request transmission of the first data from AP-1 702-1 based on the decoding success report received in step S730 (S740). AP-1 (702-1) may receive a signal requesting transmission of first data from the CPU (701) (S740). AP-1 (702-1) may transmit feedback indicating that the first UL signal has been successfully decoded to UE-1 (703-1). AP-1 (702-1) may transmit first data to the CPU (701) based on the signal received in step S740 (S750).

Figure 8 is a flowchart for explaining a third embodiment of a method for receiving an uplink signal in a communication system.

Referring to FIG. 8 , the communication system 800 may be the same or similar to the communication system 600 described with reference to FIG. 6 . One base station, one CPU 801, and a plurality of APs 802-1, ..., 802-M included in the communication system 800 include the base station, one CPU ( 601) and a plurality of APs 602-1, ..., 602-M. Hereinafter, in describing the third embodiment of the uplink signal reception method with reference to FIG. 8, content that is the same or similar to that described with reference to FIGS. 1 to 7 may be omitted.

In one embodiment of the communication system 800, the CPU 801 and the APs 802-1, ..., 802-M constituting the base station are the same as steps S610 to S615 described with reference to FIG. 6 or Similar operations can be performed. In one embodiment of the communication system 800, UEs 803-1, ..., 803-K and APs 802-1, ..., 802-M perform a UL signal transmission and reception procedure (S820) and decoding procedures (S825-1, S825-M) can be performed. The operations according to steps S820, S825-1, and S825-M may be the same or similar to the operations according to steps S620, S625-1, and S625-M described with reference to FIG. 6.

Meanwhile, in one embodiment of the communication system 800, the AP-M 802-M may perform a decoding operation based on cooperation with the CPU 801 instead of performing step S825-M corresponding to an independent decoding operation. You can. For example, when the AP-M (802-M) receives information indicating that an AP has succeeded in decoding a UL signal (i.e., decoding success information), the AP-M (802-M) can obtain the successfully decoded information through the CPU (801). there is. The AP-M (802-M) may perform decoding based on a successive interference cancellation (SIC) operation using information decoded by another AP.

For example, if AP-1 (802-1) succeeds in decoding according to step S825-1, at least some of the CPU (801) and APs (802-1, ..., 802-M) are connected to AP-1. A signaling procedure related to successful decoding at (802-1) may be performed (S830). Operations according to the signaling procedure in step S830 may be the same or similar to at least some of the operations according to steps S730 to S750 described with reference to FIG. 7.

AP-M 802-M may receive decoding success information from CPU 801 indicating that AP 802-1 succeeded in decoding the UL signal from UE-1 803-1. AP-M (802-M) may transmit a signal to the CPU (801) requesting transmission of the first data received from AP-1 (802-1) (S835). The CPU 801 may transmit first data to the AP-M 802-M based on the signal received in step S835 (S840). AP-M (802-M) may receive first data from CPU (801) (S840).

The AP-M (802-M) may perform a decoding operation based on the SIC operation using the first data received from the CPU (801) (S845). The AP-M (802-) may apply SIC operation using the first data when performing a decoding operation on the UL signal received from the UE-K (803-K). Through this, the probability of data loss or the impact of interference during the signal transmission and reception process can be effectively reduced.

If the AP-M (802-M) successfully decodes the UL signal from the UE-K (803-K) in step S845, the AP-M (802-M) transmits a decoding success report to the CPU (801). (S850). CPU 801 may receive a decoding success report from AP-M 802-M (S850). The CPU 801 may configure decoding success information based on information included in the decoding success report received from the AP-M 802-M. The CPU 801 may transmit the configured decoding success information to at least some of the APs 802-1, ..., 802-M (S855).

The CPU 801 may transmit a signal requesting transmission of information (hereinafter referred to as M data) successfully decoded by the AP-M 802-M to the AP-M 802-M (S860). AP-M (802-M) may transmit feedback indicating that the UL signal from UE-K (803-K) has been successfully decoded to UE-K (803-K) (S865). The AP-M 802-M may transmit the M-th data to the CPU 801 based on the signal received in step S860 (S870). The technical characteristics of the operations according to steps S850 to S870 may be the same or similar to the technical characteristics of the operations according to steps S730 to S750 described with reference to FIG. 7.

Figure 9 is a flowchart for explaining a fourth embodiment of a method for receiving an uplink signal in a communication system.

Referring to FIG. 9 , the communication system 900 may be the same or similar to the communication system 600 described with reference to FIG. 6 . One base station, one CPU 901, and a plurality of APs 902-1, ..., 902-M included in the communication system 900 include the base station, one CPU ( 601) and a plurality of APs 602-1, ..., 602-M. Hereinafter, in describing the fourth embodiment of the uplink signal reception method with reference to FIG. 9, content that is the same or similar to that described with reference to FIGS. 1 to 8 may be omitted.

In one embodiment of the communication system 900, the CPU 901 and the APs 902-1, ..., 902-M constituting the base station are the same as steps S610 to S615 described with reference to FIG. 6, or Similar operations can be performed. In one embodiment of the communication system 900, UEs 903-1, ..., 903-K and APs 902-1, ..., 902-M perform a UL signal transmission and reception procedure (S920) and decoding procedures (S925-1, S925-M) can be performed. The operations according to steps S920, S925-1, and S925-M may be the same or similar to the operations according to steps S620, S625-1, and S625-M described with reference to FIG. 6.

In one embodiment of the communication system 900, when a specific AP fails to decode a UL signal from a specific UE, the CPU 801 may perform decoding of the UL signal from the UE on behalf of the AP. . For example, if the AP-M (902-M) fails to decode according to step S925-1 (S930), the AP-M (902-M) may transmit a decoding failure report to the CPU (901) (S930). . Based on the decoding failure report received in step S930, the CPU 901 allows the AP-M (902-M) to decode the UL signal (hereinafter referred to as the Kth UL signal) from the UE-K (903-K). You can recognize that you have failed. In order to perform decoding on the K-th UL signal, the CPU 901 requests transmission of partial UL data for the K-th UL signal from at least some of the APs 902-1, ..., 902-M. A signal can be transmitted (S940). Here, the partial UL data may be the same or similar to the partial UL data described with reference to FIG. 6. Among the APs 902-1, ..., 902-M, the APs that received the Kth UL signal in step S920 partially receive the Kth UL signal based on a request from the CPU 901 in step S945. UL data can be transmitted to the CPU 901 (S945). The information transmitted in step S945 may be organized the same or similar to Table 7, for example.

Alternatively, each AP may transmit partial UL data for a UL signal that it failed to decode to the CPU 901. For example, information on partial UL data transmitted from the AP-M (902-M) to the CPU (901) may be organized the same or similar to Table 8.

The CPU 901 may perform decoding on the Kth UL signal based on the partial UL data for the Kth UL signal received in step S945 (S950). The CPU 901 may obtain data corresponding to the Kth UL signal based on the result of the decoding operation in step S950. Meanwhile, the CPU 901 may transmit feedback to the UE-K 903-K based on the result of the decoding operation in step S950 (S955).

According to an embodiment of a method and apparatus for transmitting and receiving signals in a communication system, a decoding operation for each UL signal from UEs at a base station configured with a distributed antenna structure in a communication system is performed using a control device (CPU, etc.) and a plurality of distributed It can be performed based on a specific entity among APs.

According to an embodiment of a method and apparatus for transmitting and receiving signals in a communication system, the decoding subject (decoding location) for each of the UL signals can be determined through a simple signaling procedure between the control device and a plurality of distributed APs in the communication system. , UL signals can be decoded efficiently. As a result, UL signal reception performance can be improved in a base station configured with a distributed antenna structure.

However, the effects that can be achieved by embodiments of the method and device for transmitting and receiving signals in a communication system are not limited to those mentioned above, and other effects not mentioned may be obtained from the configurations described in the specification of the present disclosure. It will be clearly understandable to those with ordinary knowledge in the relevant technical field.

The operation of the method according to the embodiment of the present disclosure can be implemented as a computer-readable program or code on a computer-readable recording medium. Computer-readable recording media include all types of recording devices that store information that can be read by a computer system. Additionally, computer-readable recording media can be distributed across networked computer systems so that computer-readable programs or codes can be stored and executed in a distributed manner.

Additionally, computer-readable recording media may include hardware devices specially configured to store and execute program instructions, such as ROM, RAM, flash memory, etc. Program instructions may include not only machine language code such as that created by a compiler, but also high-level language code that can be executed by a computer using an interpreter, etc.

Although some aspects of the disclosure have been described in the context of an apparatus, it may also refer to a corresponding method description, where a block or device corresponds to a method step or feature of a method step. Similarly, aspects described in the context of a method may also be represented by corresponding blocks or items or features of a corresponding device. Some or all of the method steps may be performed by (or using) a hardware device, such as a microprocessor, programmable computer, or electronic circuit, for example. In some embodiments, at least one or more of the most important method steps may be performed by such an apparatus.

In embodiments, a programmable logic device (e.g., a field programmable gate array) may be used to perform some or all of the functionality of the methods described herein. In embodiments, a field-programmable gate array may operate in conjunction with a microprocessor to perform one of the methods described herein. In general, the methods are preferably performed by some hardware device.

Although the present disclosure has been described above with reference to preferred embodiments, those skilled in the art may modify and change the present disclosure in various ways without departing from the spirit and scope of the present disclosure as set forth in the claims below. You will understand that it is possible.

Claims (15)

A method of operating a first access point (AP) of a base station to which a distributed antenna structure is applied, comprising:
Transmitting channel information between one or more user equipment (UEs) connected to the base station and the first AP to a control device of the base station;
In the control device, receiving allocation information determined based on the channel information - the allocation information is transmitted to the uplink (UL) of each of the one or more UEs among a plurality of APs constituting the base station and the control device. It is information indicating the subject who will decode the signals;
Based on the allocation information, identifying a subject to decode uplink (UL) signals of each of the one or more UEs among a plurality of APs and a control device constituting the base station;
Directly performing a decoding operation on a first UL signal received from a first UE among the one or more UEs, based on the allocation information; and
Transmitting a first report related to a result of the decoding operation for the first UL signal to the control device,
The allocation information includes information instructing the second AP of the base station to decode the UL signal of a second UE among the one or more UEs, and in addition to the channel information, network configuration information of the plurality of APs and/or It is determined based on monitoring information about the plurality of APs,
The step of directly performing a decoding operation on the first UL signal is:
Receiving, from the control device, first decoding success information including information indicating that the second AP has successfully decoded the UL signal of the second UE;
Transmitting a third request requesting information about a decoding result from the second AP to the control device;
Receiving information about a decoding result of a second UL signal received by the second AP from the second UE, from the control device; and
Comprising the step of performing decoding on the first UL signal based on a successive interference cancellation (SIC) operation using information about the decoding result of the second UL signal,
Method of operating a first access point. In claim 1,
The step of transmitting the channel information is,
performing measurement on UL channels between the one or more UEs and the first AP;
generating the channel information based on measurement results for the UL channels; and
Including transmitting the channel information to the control device,
Method of operating a first access point. In claim 1,
The allocation information includes information directing the first AP to decode UL signals of at least the first UE among the one or more UEs,
Method of operating a first access point. In claim 1,
When the first UL signal is successfully decoded, the operation method of the first AP is:
After transmitting the first report, receiving a first request from the control device; and
Based on the first request, further comprising transmitting the decoded first UL signal, which is a result of decoding the first UL signal, to the control device,
Method of operating a first access point. In claim 1,
If the first UL signal is not successfully decoded, the operation method of the first AP is:
After transmitting the first report, receiving a second request from the control device; and
Based on the second request, transmitting first information about the first UL signal to the control device,
The first information is used by the control device to perform decoding on the first UL signal,
Method of operating a first access point. In claim 5,
The first information is,
Corresponding to information on the first UL signal itself, or information on the log-likelihood ratio (LLR) for the first UL signal,
Method of operating a first access point. delete In claim 1,
The allocation information includes information instructing at least the first AP and the third AP of the base station to decode the UL signal of a third UE among the one or more UEs,
The operation method of the first AP is:
After the confirming step, receiving second decoding success information including information indicating that the third AP has successfully decoded the UL signal of the third UE from the control device; and
Based on the second decoding success information, further comprising determining that there is no need to perform decoding on the third UL signal received from the third UE,
Method of operating a first access point. As a method of operating a control device of a base station to which a distributed antenna structure is applied,
Receiving channel information between one or more user equipment (UE) connected to the base station and each of the plurality of APs from a plurality of access points (APs) included in the base station;
determining allocation information, based at least on the channel information;
transmitting the allocation information to at least some of the plurality of APs; and
Receiving, from a first AP among the plurality of APs, a first report related to a result of a decoding operation for an uplink (UL) signal received from a first UE among the one or more UEs based on the allocation information It includes the steps of:
The allocation information includes information indicating a subject to decode the UL signals of each of the one or more UEs among the plurality of APs and the control device,
The allocation information includes information instructing the second AP of the base station to decode the UL signal of a second UE among the one or more UEs, and in addition to the channel information, network configuration information of the plurality of APs and/or It is determined based on monitoring information about the plurality of APs,
The operation method of the control device is,
Before receiving the first report, receiving a second report from the second AP indicating that the UL signal of the second UE has been successfully decoded;
Based on the second report, transmitting first decoding success information indicating that the second AP has successfully decoded the UL signal of the second UE to the first AP;
Receiving, from the first AP, a third request requesting information about a decoding result from the second AP; and
Further comprising transmitting, by the second AP, to the first AP, information about the decoding result of the second UL signal received from the second UE,
The information about the decoding result of the second UL signal is used in a successful interference cancellation (SIC) operation for the decoding operation for the UL signal received from the first UE in the first AP.
How the control device operates. In claim 9,
The determining step is,
Comprising determining the allocation information based on at least some of the channel information, network setting information, or monitoring information,
How the control device operates. In claim 10,
The network setting information includes information on processing capacity for each AP, and the monitoring information includes information on fronthaul capacity between the control device and the APs.
How the control device operates. In claim 9,
When the first report indicates successful decoding, the operation method of the control device is:
After receiving the first report, transmitting a first request requesting transmission of a decoding result of the UL signal received from the first UE to the first AP; and
Based on the first request, further comprising receiving a decoded first UL signal,
How the control device operates. In claim 9,
When the first report indicates decoding failure, the operation method of the control device is:
After receiving the first report, transmitting a second request requesting transmission of first information to the first AP; and
Further comprising receiving the first information transmitted based on the second request from the first AP,
The first information is used by the control device to perform decoding of the UL signal from the first UE.
How the control device operates. delete In claim 9,
The allocation information includes information instructing at least the first AP and the third AP of the base station to decode the UL signal of a third UE among the one or more UEs,
The operation method of the control device is,
After the transmitting step, receiving a third report from the third AP indicating that the UL signal of the first UE has been successfully decoded; and
Based on the third report, further comprising transmitting second decoding success information to at least the first AP,
How the control device operates.

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