09 - Scientific and electric apparatus and instruments
Goods & Services
(1) Antennas and antennas for wireless communications apparatus; communication hubs; optical communications systems comprised of optical and electronic hardware and computer software for the transmission of data between two points; telecommunications and data networking hardware, namely, devices for transporting and aggregating voice, data, and video communications across multiple network infrastructures and communications protocols; telecommunications equipment, namely, fiber optic repeaters, converters and optimizers, wave division multiplexers, free-space optics transmission systems, switches including ethernet switches and routers, terminators and repeaters, and remote presence management products, namely, switches, and console, alarm, sensor and power management devices; computer hardware, namely, wireless access point (wap) devices; LAN (local area network) access points for connecting network computer users; electronic and optical communications instruments and components, namely, optical transmitters, optical receivers, optical transceivers and optical data links; electronic equipment, instruments and components for supporting wireless communication, network communication, building automation and environmental controls, and security, namely, headend video compressors and wireless communication devices for voice, data or image transmission; computer hardware for cellular radio access networks, wireless local area networks, wireless local area networks access points and mobile telecommunications apparatus; computer operating software for cellular radio access networks, wireless local area networks, wireless local area networks access points, and mobile telecommunications apparatus; mobile telecommunications operating software for cellular radio access networks, wireless local area networks, wireless local area networks access points, and mobile telecommunications apparatus, namely, operating software for cellular radio base stations, wireless local area networks and wireless local area networks access points and their associated network nodes; radio access network (ran) systems composed of software, hardware, network and communications equipment; cloud-radio access network (c-ran) systems composed of software, hardware, network and communications equipment, and cloud-based data processing and storage devices; radio receivers and radio signal tuners; computer hardware and software systems for managing radio access networks, distributed antenna systems (das) and telecommunications equipment; computer software and hardware for managing radio access networks, distributed antenna systems (das) and telecommunications equipment; computer software for managing radio access networks, distributed antenna systems (das) and telecommunications equipment; computer software platforms for managing radio access networks, distributed antenna systems (das) and telecommunications equipment; downloadable cloud-based software for managing distributed antenna systems (das) and telecommunications equipment.
2.
COMMUNICATION NODE AND METHOD OF OUTPUTTING SYNCHRONIZATION SIGNAL IN THE SAME
Provided is a method of outputting a synchronization signal in a communication node comprising: receiving communication connection information from a terminal, identifying detectable position information of a synchronization signal block (SS block) included in the communication connection information, setting a position of the SS block based on the identified detectable position information, and outputting the SS block based on the set position.
09 - Scientific and electric apparatus and instruments
Goods & Services
antennas and antennas for wireless communications apparatus; communication hubs; optical communications systems comprised of optical and electronic hardware and computer software for the transmission of data between two points; telecommunications and data networking hardware, namely, devices for transporting and aggregating voice, data, and video communications across multiple network infrastructures and communications protocols; telecommunications equipment, namely, fiber optic repeaters, converters and optimizers, wave division multiplexers, free-space optics transmission systems, switches including ethernet switches and routers, terminators and repeaters, and remote presence management products, namely, switches, and console, alarm, sensor and power management devices; computer hardware, namely, wireless access point (wap) devices; LAN (local area network) access points for connecting network computer users; electronic and optical communications instruments and components, namely, optical transmitters, optical receivers, optical transceivers and optical data links; electronic equipment, instruments and components for supporting wireless communication, network communication, building automation and environmental controls, and security, namely, headend video compressors and wireless communication devices for voice, data or image transmission; computer hardware for cellular radio access networks, wireless local area networks, wireless local area networks access points and mobile telecommunications apparatus; computer operating software for cellular radio access networks, wireless local area networks, wireless local area networks access points, and mobile telecommunications apparatus; mobile telecommunications operating software for cellular radio access networks, wireless local area networks, wireless local area networks access points, and mobile telecommunications apparatus, namely, operating software for cellular radio base stations, wireless local area networks and wireless local area networks access points and their associated network nodes; radio access network (ran) systems composed of software, hardware, network and communications equipment; cloud-radio access network (c-ran) systems composed of software, hardware, network and communications equipment, and cloud-based data processing and storage devices; radio receivers and radio signal tuners; computer hardware and software systems for managing radio access networks, distributed antenna systems (das) and telecommunications equipment; computer software and hardware for managing radio access networks, distributed antenna systems (das) and telecommunications equipment; computer software for managing radio access networks, distributed antenna systems (das) and telecommunications equipment; computer software platforms for managing radio access networks, distributed antenna systems (das) and telecommunications equipment; downloadable cloud-based software for managing distributed antenna systems (das) and telecommunications equipment
4.
METHOD FOR PERFORMING TIME SYNCHRONIZATION OF BASE STATION SIGNALS IN DISTRIBUTED ANTENNA SYSTEM
According to one aspect of the technical idea of the present disclosure, a method performed by a communication node communicatively connected to at least one lower communication node in a communication system is disclosed, the method comprising the steps of: receiving a first signal from an open-radio access network (O-RAN) base station; receiving a second signal from a legacy base station; determining a delay control value on the basis of a predetermined timing parameter value for the first signal and a sum delay value of the communication system; and delay-compensating the first signal on the basis of the delay control value so that the first signal is synchronized with the second signal at a reference transmission time.
A method performed by a transmission device in a communication system according to an embodiment of the present disclosure comprises the steps of: acquiring synchronous information; generating an ethernet frame including synchronization information on the basis of the synchronous information; generating an analog signal on the basis of the synchronous information; combining the ethernet frame and the analog signal; and transmitting the combined signal to a reception device through a wired cable.
A method performed by a first distributed antenna system (DAS) node unit in a communication system including a DAS includes: measuring information related to a delay of at least one second DAS node unit connected to the first DAS node unit; generating delay information for the at least one second DAS node unit based on the information related to the delay; and transmitting the delay information to an open-radio access network (O-RAN) node unit of a base station to which the DAS is connected.
INDUSTRIAL-UNIVERSITY COOPERATION FOUNDATION KOREA AEROSPACE UNIVERSITY (Republic of Korea)
Inventor
Kim, Hyunchae
Moon, Woosik
Kwon, Nagwon
Choi, Jihoon
Abstract
Provided are a method of operating a communication system using physical layer division, the method comprises extracting an initial random access signal from an uplink signal, in a first physical layer of a first communication node of the communication system reducing a data amount of the extracted initial random access signal in the first physical layer and calculating a time synchronization error using the initial random access signal with a reduced amount of data, in a second physical layer of a second communication node of the communication system.
In a method for managing an antenna device through a fronthaul multiplexer device according to an aspect of the present invention, configuration information of an antenna device is transmitted to a fronthaul multiplexer device, and whenever each antenna device is activated, the fronthaul multiplexer device transmits, on behalf of a distributed base station device, the configuration information of the antenna device, so as to reduce the burden on the distributed base station device and enable an efficient antenna device configuration.
Provided are a method of operating a communication node that includes a memory and a processor and receives and processes a communication signal with a variable number of component carriers comprising dividing the communication signal into a plurality of divided signals based on the number of component carriers included in the received communication signal and the number of signal processing paths provided in the communication node and distributing the plurality of divided signals to the signal processing paths provided in the communication node, respectively, and processing the divided signals.
A distributed antenna system according to an aspect of the technical idea of the present disclosure comprises: a main unit; at least one hub unit selectively connected to the main unit; and a plurality of remote units each connected to the main unit or the at least one hub unit, wherein the distributed antenna system does not include a point of interest (POI) so that the main unit is directly connected to a distributed unit (DU) of a base station system through a cable.
According to one aspect of the technical idea of the present disclosure, a method of operating a node device in an open radio access network (O-RAN) is disclosed, including receiving messages related to a user-plane from at least one south-node device, and determining combining operation timing of the messages in an extended antenna-carrier (eAxC) unit, based on the messages.
A method performed by a middle node in a communication system includes: receiving a request message for capability information from a controller, transmitting capability information of the middle node as a response to the request message; and receiving timing information corresponding to multiple subcarrier spacings (SCSs) from the controller based on the capability information of the middle node.
A method performed by a middle node in a communication system includes: receiving a request message for capability information from a controller; transmitting capability information of the middle node as a response to the request message; and receiving configuration information for an extended antenna carrier (eAxC)_identifier (ID) group supporting Section Extension 10 based on the capability information of the middle node from the controller.
An operating method of a communication node connected between a base station and a remote node, according to one aspect of the technical idea of the present disclosure, comprises the steps of: detecting a beam ID, a payload, and a frame start point from a first frame received from the base station; calculating, on the basis of the detected frame start point, symbol intervals of a plurality of symbols included in the first frame; generating, on the basis of the calculated symbol intervals, pulse signals corresponding to each of the plurality of symbols; generating a second frame including the generated pulse signals; and transmitting the generated second frame to the remote node.
09 - Scientific and electric apparatus and instruments
Goods & Services
Cellular repeaters; telecommunication base station interface units, namely, headend units for radio communication systems; communication HUB units for radio communications systems; remote units for wireless transmission and reception for radio communication systems; transmitters and receivers for cellular signals
09 - Scientific and electric apparatus and instruments
Goods & Services
Cellular repeaters; telecommunication base station interface units, namely, headend units for radio communication systems; communication HUB units for radio communications systems; remote units for wireless transmission and reception for radio communication systems; transmitters and receivers for cellular signals
17.
Distributed antenna system and method of operation thereof
There is provided a method of processing uplink Ethernet packets of an aggregation node included in a distributed antenna system, the method includes: receiving a plurality of uplink Ethernet packets; summing the plurality of received uplink Ethernet packets; and transmitting the summed uplink Ethernet packets in an uplink direction.
Provided is an optical transceiver including: a receiver configured to receive an optical transmission signal including wavelength information from another optical transceiver through a multiplexer/demultiplexer connected to the receiver; and a controller configured to identify a reception wavelength for communication with the other optical transceiver and to determine a wavelength corresponding to the reception wavelength as a transmission wavelength for communication with the other optical transceiver, based on the wavelength information included in the optical transmission signal.
The disclosure provides a method of operating a distributed antenna system (DAS) interworking with a spectrum sharing system (SSS) including: transmitting, by a node unit of the DAS, DAS information to a management system entity (MSE); generating, by the MSE, linkage information based on the DAS information and radio service device (RSD) information received from at least one RSD of the SSS; transmitting, by the MSE, the interworking information to a system controller of the SSS; receiving, by the MSE, allocation information including a result of allocating shared radio resources to the DAS and the at least one RSD, respectively, according to the interworking information from the system controller; transmitting, by the MSE, the allocation information to the node unit; and operating, by the node unit, according to the allocation information.
The present disclosure provides a method of allocating shared radio resources in a spectrum shared system (SSS), the method including: obtaining, by a system controller of the SSS, identification information from at least one radio service device of the SSS and a node unit of a distributed antenna system (DAS); determining, by the system controller of the SSS, whether the at least one radio service device interoperates with the DAS based on the identification information; and allocating, by the system controller of the SSS, the shared radio resources to the at least one radio service device and the DAS, respectively, based on a result of the determining of interoperating.
Provided are a method of synchronizing a communication network, the method comprising obtaining a quality parameter of at least two or more synchronization sources connected to communication nodes in a communication network and a capacity parameter of the communication nodes connected to the synchronization sources, selecting a synchronization source to be used for synchronization of the communication network from among the at least two or more synchronization sources, according to a priority based on the obtained quality parameter and capacity parameter and performing synchronization of the communication network using a synchronization signal provided from the selected synchronization source.
09 - Scientific and electric apparatus and instruments
Goods & Services
Antennas and antennas for wireless communications apparatus; Communication hubs; Optical communications systems comprised of optical and electronic hardware and computer software for the transmission of data between two points; Telecommunications and data networking hardware, namely, devices for transporting and aggregating voice, data, and video communications across multiple network infrastructures and communications protocols; Telecommunications equipment, namely, fiber optic repeaters, converters and optimizers, wave division multiplexers, free-space optics transmission systems, switches including Ethernet switches and routers, terminators and repeaters, and remote presence management products, namely, switches, and console, alarm, sensor and power management devices; Facilities management software, namely, software to control building environment, access and security systems; Computer hardware, namely, wireless access point (WAP) devices; LAN (local area network) access points for connecting network computer users; Electronic and optical communications instruments and components, namely, optical transmitters, optical receivers, optical transceivers and optical data links; electronic equipment, instruments and components for supporting wireless communication, network communication, building automation and environmental controls, and security, namely, headend video compressors and wireless communication devices for voice, data or image transmission; Computer hardware for cellular radio access networks, wireless local area networks, wireless local area networks access points and mobile telecommunications apparatus; computer operating software for cellular radio access networks, wireless local area networks, wireless local area networks access points, and mobile telecommunications apparatus; mobile telecommunications operating software for cellular radio access networks, wireless local area networks, wireless local area networks access points, and mobile telecommunications apparatus, namely, operating software for cellular radio base stations, wireless local area networks and wireless local area networks access points and their associated network nodes; radio access network systems composed of software, hardware, network and communications equipment; Radio Access Network (RAN) systems composed of software, hardware, network and communications equipment; Cloud-Radio Access Network (C-RAN) systems composed of software, hardware, network and communications equipment, and cloud-based data processing and storage devices; radio receivers and radio signal tuners; Computer hardware and software systems for managing radio access networks, Distributed Antenna Systems (DAS) and telecommunications equipment; Computer software and hardware for managing radio access networks, Distributed Antenna Systems (DAS) and telecommunications equipment; Computer software for managing radio access networks, Distributed Antenna Systems (DAS) and telecommunications equipment; Computer software platforms for managing radio access networks, Distributed Antenna Systems (DAS) and telecommunications equipment; Downloadable cloud-based software for managing Distributed Antenna Systems (DAS) and telecommunications equipment; all of the aforesaid goods being component parts of, or being for use in connection with, distributed antenna systems, Open RAN, mmWave, optical fronthaul and backhaul solutions, IoT (Internet of Things), and RF Repeater Solutions; none of the afore-mentioned goods related to vehicles, automobiles, or cars, except for repeaters intended for use in connecting to telecommunication chips embedded in vehicles, automobiles, or cars.
09 - Scientific and electric apparatus and instruments
Goods & Services
Antennas and antennas for wireless communications apparatus; Communication hubs; Optical communications systems comprised of optical and electronic hardware and computer software for the transmission of data between two points; Telecommunications and data networking hardware, namely, devices for transporting and aggregating voice, data, and video communications across multiple network infrastructures and communications protocols; Telecommunications equipment, namely, fiber optic repeaters, converters and optimizers, wave division multiplexers, free-space optics transmission systems, switches including Ethernet switches and routers, terminators and repeaters, and remote presence management products, namely, switches, and console, alarm, sensor and power management devices; Facilities management software, namely, software to control building environment, access and security systems; Computer hardware, namely, wireless access point (WAP) devices; LAN (local area network) access points for connecting network computer users; Electronic and optical communications instruments and components, namely, optical transmitters, optical receivers, optical transceivers and optical data links; electronic equipment, instruments and components for supporting wireless communication, network communication, building automation and environmental controls, and security, namely, headend video compressors and wireless communication devices for voice, data or image transmission; Computer hardware for cellular radio access networks, wireless local area networks, wireless local area networks access points and mobile telecommunications apparatus; computer operating software for cellular radio access networks, wireless local area networks, wireless local area networks access points, and mobile telecommunications apparatus; mobile telecommunications operating software for cellular radio access networks, wireless local area networks, wireless local area networks access points, and mobile telecommunications apparatus, namely, operating software for cellular radio base stations, wireless local area networks and wireless local area networks access points and their associated network nodes; radio access network systems composed of software, hardware, network and communications equipment; Radio Access Network (RAN) systems composed of software, hardware, network and communications equipment; Cloud-Radio Access Network (C-RAN) systems composed of software, hardware, network and communications equipment, and cloud-based data processing and storage devices; radio receivers and radio signal tuners; Computer hardware and software systems for managing radio access networks, Distributed Antenna Systems (DAS) and telecommunications equipment; Computer software and hardware for managing radio access networks, Distributed Antenna Systems (DAS) and telecommunications equipment; Computer software for managing radio access networks, Distributed Antenna Systems (DAS) and telecommunications equipment; Computer software platforms for managing radio access networks, Distributed Antenna Systems (DAS) and telecommunications equipment; Downloadable cloud-based software for managing Distributed Antenna Systems (DAS) and telecommunications equipment; all of the aforesaid goods being component parts of, or being for use in connection with, distributed antenna systems, Open RAN, mmWave, optical fronthaul and backhaul solutions, IoT (Internet of Things), and RF Repeater Solutions; none of the afore-mentioned goods related to vehicles, automobiles, or cars, except for repeaters intended for use in connecting to telecommunication chips embedded in vehicles, automobiles, or cars.
09 - Scientific and electric apparatus and instruments
Goods & Services
Antennas and antennas for wireless communications apparatus; Communication hubs; Optical communications systems comprised of optical and electronic hardware and computer software for the transmission of data between two points; Telecommunications and data networking hardware, namely, devices for transporting and aggregating voice, data, and video communi-cations across multiple network infrastructures and communications protocols; Telecommuni-cations equipment, namely, fiber optic repeaters, converters and optimizers, wave division multiplexers, free-space optics transmission systems, switches including Ethernet switches and routers, terminators and repeaters, and remote presence management products, namely, switches, and console, alarm, sensor and power management devices; Facilities management software, namely, software to control building environment, access and security systems; Computer hardware, namely, wireless access point (WAP) devices; LAN (local area network) access points for connecting network computer users; Electronic and optical communications instruments and components, namely, optical transmitters, optical receivers, optical transceiv-ers and optical data links; electronic equipment, instruments and components for supporting wireless communication, network communication, building automation and environmental controls, and security, namely, headend video compressors and wireless communication devices for voice, data or image transmission; Computer hardware for cellular radio access networks, wireless local area networks, wireless local area networks access points and mobile telecommunications apparatus; computer operating software for cellular radio access net-works, wireless local area networks, wireless local area networks access points, and mobile telecommunications apparatus; mobile telecommunications operating software for cellular radio access networks, wireless local area networks, wireless local area networks access points, and mobile telecommunications apparatus, namely, operating software for cellular radio base stations, wireless local area networks and wireless local area networks access points and their associated network nodes; radio access network systems composed of software, hardware, network and communications equipment; Radio Access Network (RAN) systems composed of software, hardware, network and communications equipment; Cloud-Radio Access Network (C-RAN) systems composed of software, hardware, network and communications equipment, and cloud-based data processing and storage devices; radio receivers and radio signal tuners; Computer hardware and software systems for managing radio access networks, Distributed Antenna Systems (DAS) and telecommunications equip-ment; Computer software and hardware for managing radio access networks, Distributed Antenna Systems (DAS) and telecommunications equipment; Computer software for manag-ing radio access networks, Distributed Antenna Systems (DAS) and telecommunications equipment; Computer software platforms for managing radio access networks, Distributed Antenna Systems (DAS) and telecommunications equipment; Downloadable cloud-based software for managing Distributed Antenna Systems (DAS) and telecommunications equip-ment; all of the aforesaid goods being component parts of, or being for use in connection with, distributed antenna systems, Open RAN, mmWave, optical fronthaul and backhaul solutions, IoT (Internet of Things), and RF Repeater Solutions; none of the afore-mentioned goods related to vehicles, automobiles, or cars, except for repeaters intended for use in connecting to telecommunication chips embedded in vehicles, automobiles, or cars.
25.
COMMUNICATION REPEATER AND METHOD FOR RESTORING SYNCHRONIZATION THEREOF
Provided is a communication repeater including a receiver configured to receive a plurality of test signals from a plurality of external communication devices and then receive a plurality of downlink signals from the plurality of external communication devices, and a digital signal processor configured to measure a delay time of each of the plurality of test signals and perform a delay synchronization process for the plurality of downlink signals, wherein the digital signal processor is configured to determine whether the plurality of downlink signals for which the delay synchronization process has been performed are synchronized, and perform synchronization restoration for a downlink signal having a synchronization error among the plurality of downlink signals, based on a result of the determining.
INDUSTRY-UNIVERSITY COOPERATION FOUNDATION KOREA AEROSPACE UNIVERSITY (Republic of Korea)
Inventor
Kwon, Nagwon
Kim, Hyunchae
Choi, Jihoon
Abstract
A communication node included in a multi-antenna multi-carrier system, when precoding matrices corresponding to some subcarriers from among subcarriers allocated to another communication node connected to the communication node are input, obtains precoding matrices for at least some subcarriers from among the allocated subcarriers by performing spherical interpolation on the input precoding matrices, maps the obtained precoding matrices for the at least some subcarriers to the subcarriers allocated to the other communication node, and performs precoding on the plurality of vector signals using the mapped precoding matrices.
09 - Scientific and electric apparatus and instruments
Goods & Services
Telecommunications equipment for providing network capacity for Distributed Antenna Systems (DAS); Indoor network solutions for in-building coverage and capacity, namely, distributed antenna systems (DAS) comprised of multiplexers, wireless receivers and transmitters, antennas, wireless controllers to monitor and control the functioning of other electronic devices; Indoor network solutions for in-building coverage and capacity, namely Small cells being multiplexers, wireless receivers and transmitters, wireless controllers to monitor and control the functioning of other electronic devices and RAN solutions comprised of multiplexers, radio receivers and transmitters, and wireless controllers to monitor and control the functioning of other electronic devices; Indoor network solutions comprising small cell station, namely, broadband telecommunication small base station that connects group users in a communication environment, namely, business buildings, hospitals, gyms, commercial buildings, hotels, shopping malls and stadiums; Indoor networks and systems, namely, distributed antenna systems (DAS) comprising amplifiers, receivers, digital signal processors, and a network of spatially separated antennas connected to telecommunications cables, fiber optic cables and/or coaxial cables, that provide wireless service; Indoor networks and systems being distributed antenna systems (DAS) management system, namely, telecommunication hardware and downloadable and recorded software to remotely monitor and control the function and status of other electrical, electronic, and mechanical devices or systems; and Indoor networks and systems being apparatus and equipment for wireless networks, cellular and wireless telephone communication, namely, distributed antenna systems (DAS) comprised of antennas, amplifiers receivers, and digital signal processors.
28.
COMMUNICATION NODE, COMMUNICATION SYSTEM, AND OPERATION METHODS THEREOF
An operation method of a communication node comprising a memory and a processor, and receiving and processing a communication signal in which the number of component carriers varies, according to an embodiment of the present invention, comprises the steps of: dividing the communication signal into a plurality of divided signals, on the basis of the number of component carriers included in the received communication signal and the number of signal processing paths provided in the communication node; and distributing the plurality of divided signals to the signal processing paths provided in the communication node, respectively, and processing same.
09 - Scientific and electric apparatus and instruments
Goods & Services
Telecommunications equipment, namely, antennas for providing network capacity for distributed antenna systems (DAS); Indoor network solutions for in-building coverage and capacity, namely, distributed antenna systems (DAS) comprised of multiplexers, wireless receivers and transmitters, antennas, wireless controllers to monitor and control the functioning of other electronic devices, Small cells being multiplexers, and radio access network solutions being telecommunications systems comprised of multiplexers, radio receivers and transmitters, and wireless controllers to monitor and control the functioning of other electronic devices; Indoor network solutions, namely, telecommunications systems comprising a small cell station being a broadband telecommunication small base station that connects group users in a communication environment, namely, business buildings, hospitals, gyms, commercial buildings, hotels, shopping malls and stadiums; Indoor network telecommunication equipment and systems, namely, distributed antenna systems (DAS) comprising amplifiers, radio receivers, digital signal processors, and a network of spatially separated antennas connected to telecommunications cables, fiber optic cables and/or coaxial cables, that provide wireless service; Indoor network telecommunication equipment and systems being a distributed antenna systems (DAS) management system, namely, telecommunication hardware and downloadable and recorded software to remotely monitor and control the wireless communications network function and status of other electrical, electronic, and mechanical devices or systems sold as a unit; and Indoor network telecommunication equipment and systems being apparatus and equipment for wireless networks, cellular and wireless telephone communication, namely, distributed antenna systems (DAS) comprised of antennas, amplifiers, radio receivers, and digital signal processors
H04B 7/08 - Diversity systemsMulti-antenna systems, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
H03M 7/24 - Conversion to or from floating-point codes
A fronthaul multiplexer according to one aspect of the present invention combines uplink packets in a compressed state that is received from two or more radio units so that the uplink packets are accumulated and combined immediately when received or the uplink packets are recompressed using a compressing method with high compression efficiency when stored in a memory in order to reduce a use amount of memory.
According to one aspect of the disclosure, there is provided a mount bracket for installation of communication device in a structure, the mount bracket including: a bracket body coupled to the structure; a bracket base, to which the communication device is fixed, coupled to the bracket body and rotates to cover the bracket body; and a connection member provided at one end of the bracket body to rotatably connect the bracket base to the bracket body, wherein the bracket base includes an anti-detachment structure for preventing separation from the bracket body during rotation.
The present disclosure relates to a method of reducing a Peak to Average Power Ratio (PAPR) in a communication device, and more particularly, to a method of Crest Factor Reduction (CFR) processing of a signal in order to reduce a PAPR in a communication device such as a repeater. The communication device includes: a first CFR module configured generate a first processed signal by CFR processing an original signal; and a second CFR module configured generate a second processed signal by CFR processing the first processed signal, wherein the first processed signal is generated using a first sampling rate, and the second processed signal is generated using a second sampling rate. According to the disclosure, even a communication device with a low sampling rate may effectively remove a peak component of an input signal.
Provided are a clock synchronization method performed between communication nodes included in a communication network, the clock synchronization method comprises receiving a synchronization source signal through any one of remaining communication nodes except for an uppermost communication node included in the communication network, generating a reference clock for clock synchronization from the received synchronization source signal and transmitting the generated reference clock through a first path including at least a portion reverse to a second path through which a downlink signal is transmitted in the communication network.
H04L 7/00 - Arrangements for synchronising receiver with transmitter
H04L 7/033 - Speed or phase control by the received code signals, the signals containing no special synchronisation information using the transitions of the received signal to control the phase of the synchronising-signal- generating means, e.g. using a phase-locked loop
Provided are a method of operating a communication system, the method comprises mapping some antennas selected from among a plurality of antennas of each of a plurality of first communication nodes and reception ports of a second communication node, combining uplink signals mapped to an identical reception port of the second communication node from among uplink signals received through the plurality of antennas, and transmitting the combined signals to the mapped reception ports of the second communication node, respectively.
Provided is a method of outputting a synchronization signal in a communication node comprising: receiving communication connection information from a terminal, identifying detectable position information of a synchronization signal block (SS block) included in the communication connection information, setting a position of the SS block based on the identified detectable position information, and outputting the SS block based on the set position.
INDUSTRY-UNIVERSITY COOPERATION FOUNDATION KOREA AEROSPACE UNIVERSITY (Republic of Korea)
Inventor
Kim, Hyunchae
Moon, Woosik
Kwon, Nagwon
Choi, Jihoon
Abstract
Provided are a method of operating a communication system using physical layer division, the method comprises extracting an initial random access signal from an uplink signal, in a first physical layer of a first communication node of the communication system reducing a data amount of the extracted initial random access signal in the first physical layer and calculating a time synchronization error using the initial random access signal with a reduced amount of data, in a second physical layer of a second communication node of the communication system.
Provided is an optical communication system configured as an optical ring network including: a first optical communication device configured to transmit a first optical signal having a first wavelength in a first direction, and to transmit a second optical signal having a second wavelength in a second direction opposite to the first direction; and a second optical communication device configured to generate a first reflected signal by reflecting the first optical signal when the first optical signal is received, to generate a second reflected signal by reflecting the second optical signal when the second optical signal is received, and to transmit the first and second reflected signals to the first optical communication device, wherein the first optical communication device analyzes a connection state of the second optical communication device based on the first and second reflected signals.
A distributed antenna system of the present invention implements duplication by a method of configuring a first headend unit and a second headend unit in an active state or in a standby state and connecting a hub unit or a remote unit to the first headend unit and the second headend unit and by a method of connecting, through a redundancy link, a hub unit or remote units of a branch group branched from and connected to each headend unit, activating the redundancy link according to the control of an active headend unit when an error occurs in a frame transmission path, and changing logical port states of a hub unit or remote units that cannot transmit frames due to the error in order to change the frame transmission path so that frame transmission is possible through the activated redundancy link.
Provided is a method of operating a repeater operating in a time division duplex (TDD) mode which comprises detecting a synchronization signal from a received signal, determining a type of a communication period based on the detected synchronization signal and controlling an operation of a signal linearizer based on the determined type of the communication period.
FOUNDATION OF SOONGSIL UNIVERSITY-INDUSTRY COOPERATION (Republic of Korea)
Inventor
Kwon, Nagwon
Kim, Hyunchae
Kim, Chonghoon
Hong, Seungmo
Im, Sungbin
Abstract
A method of operating a repeater comprises selecting some of adaptive filter coefficients among a plurality of adaptive filter coefficients of an adaptive filter used for interference cancellation, based on the size of a coefficient, generating a predicted interference signal using the selected adaptive filter coefficients and generating an interference-canceled communication signal from a received signal using the generated predicted interference signal.
Provided are an interference cancellation repeater capable of selecting one of a plurality of adaptive filters based on a synchronization signal and canceling interference included in a received signal using the selected adaptive filter and a method of operation thereof.
An automatic wavelength setting system for an optical communication device includes: an optical transceiver included in the optical communication device, the optical transceiver configured to generate and transmit first transmission light corresponding to a first wavelength, to analyze power of first reception light received after the transmission of the first transmission light, and when it is determined that the first transmission light is received as a result of the analysis, to generate and transmit second transmission light corresponding to a second wavelength; and an optical reflector, which is formed between the optical transceiver and a multiplexer, configured to transmit the first transmission light to the connected multiplexer when the first transmission light is an optical signal of a set wavelength, and to reflect and retransmit the first transmission light to the optical transceiver when the first transmission light is not the optical signal of the set wavelength.
A method of operating a repeater comprises detecting a synchronization signal from a received communication signal, identifying a time division duplex (TDD) switching pattern based on a power change of the communication signal over time and switching an uplink operation and a downlink operation of the repeater based on the detected synchronization signal and the TDD switching pattern.
An optical communication device includes: a first multiplexer including a first transmitting port and a second transmitting port; a downstream wavelength analyzer configured to analyze first transmission light to recognize a first downstream wavelength corresponding to the first transmission light and analyze second transmission light to recognize a second downstream wavelength corresponding to the second transmission light; and a controller configured to generate a first control signal for allowing the first transmitting port to pass light corresponding to the first downstream wavelength and allowing the second transmitting port to pass light corresponding to the second downstream wavelength, and output the first control signal to the first multiplexer, wherein the first multiplexer, according to the first control signal, controls the first transmitting port to correspond to the first downstream wavelength and controls the second transmitting port to correspond to the second downstream wavelength.
According to an aspect of the disclosure, a mobile communication repeater comprises a receiver configured to receive a plurality of test signals from a plurality of external communication devices and subsequently, receive a plurality of downlink signals from the external communication devices, and a digital signal processor configured to measure a delay time of each of the plurality of test signals, generate a sync time based on the delay times, and delay each of the plurality of downlink signals to correspond with the sync time.
According to an aspect of the disclosure, an optical communication module comprises an optical transmission assembly configured to generate first transmit light based on an input electric signal and output the first transmit light, an optical reception assembly configured to divide input first receive light into first receive payload data and first receive auxiliary management data, and an auxiliary management controller configured to analyze the first receive auxiliary management data and control attenuation of one or more of transmit light output from the optical transmission assembly and receive light input to the optical reception assembly, wherein the first receive light is formed by combining the first receive payload data and the first receive auxiliary management data, and the first receive payload data and the first receive auxiliary management data have different wavelengths.
Provided are a communication node which comprises a signal monitoring device configured to receive a plurality of communication signals transmitted from two or more base stations, and to monitor a bandwidth of each of the received communication signals, a frame setter configured to reset a frame structure by merging at least some of blocks in a preset frame structure according to a result of the monitoring, and a framer configured to frame the plurality of communication signals into one frame by including the plurality of communication signals in a block corresponding to a bandwidth of each of the plurality of communication signals according to the reset frame structure.
Disclosed is an OpenFlow based distributed antenna system (DAS) policy routing method. The DAS policy routing method includes: extracting, by a DAS unit, a match field from header information of a received frame; and comparing, by the DAS unit, the extracted match field with a matching rule of a forwarding table to route according to a matching traffic transmission policy and output a frame to an output port of the DAS unit.
H04L 45/302 - Route determination based on requested QoS
H04L 45/64 - Routing or path finding of packets in data switching networks using an overlay routing layer
H04L 47/2441 - Traffic characterised by specific attributes, e.g. priority or QoS relying on flow classification, e.g. using integrated services [IntServ]
Provided is an optical communication device including: a multiplexer configured to multiplex one or more input optical signals to output a single first optical signal; a signal generator configured to generate a second optical signal having a preset wavelength; a filter configured to generate a third optical signal by combining the first optical signal and the second optical signal; a switch configured to connect any one of a plurality of optical cables connected to the switch with the filter to transmit the third optical signal through any one of the plurality of optical cables; and a controller configured to control the switch by analyzing reflected light of the second optical signal.
H04B 10/00 - Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
H04B 10/071 - Arrangements for monitoring or testing transmission systemsArrangements for fault measurement of transmission systems using a reflected signal, e.g. using optical time domain reflectometers [OTDR]
H04Q 11/00 - Selecting arrangements for multiplex systems
51.
Distributed antenna system and method of operation thereof
There is provided a method of processing uplink Ethernet packets of an aggregation node included in a distributed antenna system, the method includes: receiving a plurality of uplink Ethernet packets; summing the plurality of received uplink Ethernet packets; and transmitting the summed uplink Ethernet packets in an uplink direction.
A communication system comprises a clock generator configured to generate a plurality of system clock signals used to synchronize components included in each of communication nodes in the communication system based on an external clock signal provided by an external clock source located outside the communication system and a physical layer configured to transmit any one of the generated system clock signals to a small cell communicatively connected to an end communication node of the communication system.
Disclosed is a beacon-based positioning system. A beacon position in which a beacon is installable is defined in a target space, and a path loss model of radio frequency (RF) signals between all beacon positions and all observation positions of a scanner is determined. Among all possible installation plans for the beacon positions, an installation plan in which different beacon signals, whose RSSIs calculated using the path loss model have significant values, are received in a number greater than or equal to a minimum reference number and a total number of the beacons installed is minimum is determined as an optimal installation plan. The optimization problem of determining the optimal installation plan may be expressed by binary linear programming.
G01S 1/04 - Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmittersReceivers co-operating therewith using radio waves Details
G01S 5/02 - Position-fixing by co-ordinating two or more direction or position-line determinationsPosition-fixing by co-ordinating two or more distance determinations using radio waves
Provided is an optical communication device including: a first channel card configured to convert an input first signal into a first optical signal and output the first optical signal to any one of a first MUX/DEMUX connected to a first optical line and a second MUX/DEMUX connected to a second optical line; a second channel card configured to convert an input second signal into a second optical signal and output the second optical signal to any one of the first MUX/DEMUX and the second MUX/DEMUX; and a controller configured to monitor states of the first optical line and the second optical line to determine a MUX/DEMUX from which the first optical signal and the second optical signal are respectively output, from among the first MUX/DEMUX and the second MUX/DEMUX.
The disclosure provides a method of operating a distributed antenna system (DAS) interworking with a spectrum sharing system (SSS) including: transmitting, by a node unit of the DAS, DAS information to a management system entity (MSE); generating, by the MSE, linkage information based on the DAS information and radio service device (RSD) information received from at least one RSD of the SSS; transmitting, by the MSE, the interworking information to a system controller of the SSS; receiving, by the MSE, allocation information including a result of allocating shared radio resources to the DAS and the at least one RSD, respectively, according to the interworking information from the system controller; transmitting, by the MSE, the allocation information to the node unit; and operating, by the node unit, according to the allocation information.
The disclosure provides a method of operating a distributed antenna system (DAS) interworking with a spectrum sharing system (SSS) including: setting, by a node unit of the DAS, a radio resource to be used by each of a plurality of radio service devices (RSDs) communicatively connected to the node unit; requesting, by the node unit, available radio resource information from a system controller of the SSS based on a result of the setting; receiving, by the node unit, allocation information including a result of allocating shared radio resources of the SSS to the DAS from the system controller; and selectively activating, by the node unit, a service signal corresponding to the set radio resource of each of the plurality of RSDs according to the allocation information.
Provided is an optical transceiver including: a receiver configured to receive an optical transmission signal including wavelength information from another optical transceiver through a multiplexer/demultiplexer connected to the receiver; and a controller configured to identify a reception wavelength for communication with the other optical transceiver and to determine a wavelength corresponding to the reception wavelength as a transmission wavelength for communication with the other optical transceiver, based on the wavelength information included in the optical transmission signal.
Provided is an SINR measurement method of a repeater, the SINR measurement method including: obtaining SSBs from a plurality of base stations; obtaining cross-correlation for each of PSS symbols included in the obtained SSBs; measuring noise power based on the obtained SSBs; obtaining signal power and interference signal power based on a dot product of the cross-correlation for each of the PSS symbols; and measuring the SINR based on the signal power, the interference signal power, and the noise power.
A TSN-based distributed antenna system including a headend unit, one or more TSN switches, and one or more remote units and a fronthaul transport network constituted by the headend unit, the TSN switch, and the remote unit is provided. The packet-based fronthaul network constituted by the headend unit, the TSN switch, and the remote unit transmits traffic in a time-deterministic manner while minimizing packet loss through Ethernet to which TSN standards are applied.
Provided is an optical module assembly including: an optical module body in which an optical transceiver is built; a first connector coupled to one side of the optical module body to be connected to an optical transceiver in the optical module body; a second connector, in which an insertion hole for inserting an optical cable is formed and the optical cable is inserted into the insertion hole, connected to the first connector to connect the optical cable to the optical transceiver connected to the first connector; and a disconnection unit installed on the first connector and the second connector to release the connection between the first connector and the second connector by rotation.
Provided are a laser diode driver for a multilevel optical signal and a multilevel optical signal transmission device including the same, wherein the laser diode driver includes: a clock generator configured to generate and output a clock signal; a first latch configured to delay output of data corresponding to a first timing of the clock signal from among data sequentially input at each data input period; a second latch configured to delay output of data corresponding to a second timing of the clock signal from among data sequentially input at each data input period; a first synchronization processor configured to output a signal corresponding to the data input by the first latch according to the clock signal; and a second synchronization processor configured to output a signal corresponding to the data input by the second latch according to the clock signal.
A synchronization method of a communication network, the synchronization method comprises monitoring a connection state of second communication nodes that are synchronized using a synchronization signal provided through a first communication node to which a synchronization source is connected, determining whether the number of the connected second communication nodes exceeds a reference value according to a result of the monitoring and switching a synchronization mode of at least one second communication node when the number of the second communication nodes exceeds a reference value.
Provided is an optical transceiver including: an optical transmitter configured to sequentially generate a plurality of optical transmission signals each including transmission wavelength information and output the plurality of optical transmission signals to a connected multiplexer/demultiplexer; and a controller configured to generate the transmission wavelength information for each of the plurality of optical transmission signals.
H04B 10/00 - Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
A clock synchronization method performed between communication nodes in a communication network according to an embodiment of the present invention comprises the steps of: receiving a synchronization source signal through one of the communication nodes other than the highest layer communication node included in the communication network; generating a reference clock for clock synchronization from the received synchronization source signal; and delivering the generated reference clock through a second path including at least a portion that runs counter to a first path through which a downlink signal is transmitted in the communication network.
A method for synchronizing a communication network according to an embodiment of the present invention comprises the steps of: acquiring quality parameters of at least two synchronization sources connected to communication nodes within a communication network and capacity parameters of the communication nodes connected to the synchronization sources; selecting a synchronization source to be used for synchronization of the communication network from among the at least two synchronization sources according to a priority based on the acquired quality parameters and capacity parameters; and synchronizing the communication network by using a synchronization signal provided from the selected synchronization source.
INDUSTRY-UNIVERSITY COOPERATION FOUNDATION KOREA AEROSPACE UNIVERSITY (Republic of Korea)
Inventor
Kim, Hyunchae
Moon, Woosik
Kwon, Nagwon
Choi, Jihoon
Abstract
An operation method for a communication system using physical layer partitioning, according to an embodiment of the present invention, comprises the steps of: extracting an initial random access signal from an uplink signal in a first physical layer of a first communication node of the communication system; reducing the amount of data of the initial random access signal extracted in the first physical layer; and, in a second physical layer of a second communication node of the communication system, calculating a time synchronization error by using the initial random access signal in which the amount of data has been reduced.
Provided is an optical transceiver including a reference tunable laser module configured to generate and output light of a reference wavelength; a first general tunable laser module configured to generate and output light of a first wavelength; and a controller configured to control a tuning operation of the first wavelength of the first general tunable laser module, based on information about a relationship between the reference wavelength and the first wavelength.
An operation method of a communication system, according to one embodiment of the present invention, comprises the steps of: mapping reception ports of a second communication node with some antennas selected from a plurality of antennas of each of a plurality of first communication nodes; combining uplink signals, among uplink signals received through the plurality of antennas, which are mapped to the same reception port of the second communication node; and transmitting each of the combined signals to the respective reception ports of the second communication node to which each signal is mapped.
A method of operating a communication device including a processor and a memory, the method comprises feeding back a downlink communication signal subjected to analog signal processing, generating signal modification information according to a comparison result of the fed-back downlink communication signal and a downlink communication signal before the analog signal processing, generating an interference cancellation signal for canceling interference occurring in an uplink communication signal by the downlink communication signal based on the generated signal modification information and canceling interference occurring in the uplink communication signal by using the generated interference cancellation signal.
Provided is an optical communication system configured as an optical ring network including: a first optical communication device configured to transmit a first optical signal having a first wavelength in a first direction, and to transmit a second optical signal having a second wavelength in a second direction opposite to the first direction; and a second optical communication device configured to generate a first reflected signal by reflecting the first optical signal when the first optical signal is received, to generate a second reflected signal by reflecting the second optical signal when the second optical signal is received, and to transmit the first and second reflected signals to the first optical communication device, wherein the first optical communication device analyzes a connection state of the second optical communication device based on the first and second reflected signals.
Provided is a base station signal monitoring system including: a plurality of optical transmission devices configured to transmit a base station signal; a measuring device configured to measure the base station signal according to a preset method; and a switch device, which is connected to the plurality of optical transmission devices and the measuring device, configured to switch connections between a plurality of input ports and a plurality of output ports so that the base station signal is transmitted from one of the plurality of optical transmission devices to the other one of the plurality of optical transmission devices or the measuring device.
H04B 10/079 - Arrangements for monitoring or testing transmission systemsArrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
H04B 10/2575 - Radio-over-fibre, e.g. radio frequency signal modulated onto an optical carrier
A technology related to a distributed antenna system is disclosed. In an exemplary embodiment, a distributed antenna system may include a master unit and a plurality of remote units. The master unit may be interfaced with a wireless communications network and perform a bidirectional simultaneous digital radio frequency distribution of a wireless signal. The plurality of remote units may be each coupled to the master unit, and each perform a wireless transmission or reception of a split radio frequency signal to or from terminals located within a coverage. The master unit and the plurality of remote units may transmit or receive digital radio frequency signals in a wavelet transform domain. The master unit may determine whether the digital radio frequency signal, transmitted by each of the remote units, is normal, and merge the digital radio frequency signals.
H04B 7/024 - Co-operative use of antennas at several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
H04B 17/309 - Measuring or estimating channel quality parameters
A communication signal processing method comprises obtaining transmission delay value difference data relating to a difference in transmission delay values in a communication network that varies depending on whether or not a redundant path is used, obtaining redundancy status data relating to whether the redundant path is used, and controlling a parameter of a communication signal transmitted by the communication network based on the transmission delay value difference data when the redundant path is used as a result of determination according to the redundancy status data.
H04L 47/283 - Flow controlCongestion control in relation to timing considerations in response to processing delays, e.g. caused by jitter or round trip time [RTT]
H04W 28/02 - Traffic management, e.g. flow control or congestion control
74.
Method for transmitting GPS information of optical communication device
An optical communication device including a GPS receiver receiving and outputting a GPS signal from a satellite; a main controller configured to generate and output synchronization data based on the GPS signal; and an optical transceiver configured to generate an optical signal by superposing input payload data and the synchronization data, and to output the optical signal, wherein a first communication channel corresponding to the payload data and a second communication channel corresponding to the synchronization data are different communication channels. According to embodiments, GPS information for synchronization together with payload data, which is information to be transmitted, may be efficiently transmitted between optical communication devices located in remote locations without separate wavelength allocation and connection of an optical cable, by using an auxiliary management and control channel (AMCC).
H04L 7/00 - Arrangements for synchronising receiver with transmitter
G04R 20/02 - Setting the time according to the time information carried or implied by the radio signal the radio signal being sent by a satellite, e.g. GPS
Provided is an optical transceiver including: a controller configured to output firmware update data for updating firmware of another optical transceiver connected to the optical transceiver through an optical cable; and a transmitter configured to generate an optical signal by superposing input payload data and the firmware update data, and to transmit the optical signal to the other optical transceiver. According to embodiments, the firmware of a remote optical transceiver at a remote location is automatically updated without affecting payload data, which is information to be transmitted.
FOUNDATION OF SOONGSIL UNIVERSITY-INDUSTRY COOPERATION (Republic of Korea)
Inventor
Kwon, Nagwon
Kim, Hyunchae
Kim, Chonghoon
Abstract
Provided are a synchronization signal detection method performed by a receiver including a processor and a memory, the synchronization signal detection method comprises calculating a PSS correlation value for a primary synchronization signal (PSS) included in a received signal, detecting a frequency offset for the PSS and a timing offset for sampling timing of the received signal and detecting the PSS based on the PSS correlation value, the frequency offset, and the timing offset.
FOUNDATION OF SOONGSIL UNIVERSITY—INDUSTRY COOPERATION (Republic of Korea)
Inventor
Kwon, Nagwon
Kim, Hyunchae
Kim, Chonghoon
Abstract
A method of operating a TDD-based interference cancellation repeater, the method comprises setting a compensation gain of a gain compensator differently in an uplink communication period and a downlink communication period, setting an optimal coefficient of an adaptive filter in the uplink communication period and an optimal coefficient of the adaptive filter in the downlink communication period the same, based on the set compensation gain of the gain compensator and removing an interference signal in the uplink communication period or the downlink communication period according to the set optimal coefficient of the adaptive filter.
FOUNDATION OF SOONGSIL UNIVERSITY-INDUSTRY COOPERATION (Republic of Korea)
Inventor
Kwon, Nagwon
Kim, Hyunchae
Kim, Chonghoon
Hong, Seungmo
Im, Sungbin
Abstract
A method of operating a repeater comprises selecting some of adaptive filter coefficients among a plurality of adaptive filter coefficients of an adaptive filter used for interference cancellation, based on the size of a coefficient, generating a predicted interference signal using the selected adaptive filter coefficients and generating an interference-canceled communication signal from a received signal using the generated predicted interference signal.
An operating method of a repeater, according to an embodiment of the present invention, comprises the steps of: detecting a synchronization signal from received signals; selecting any one of a plurality of adaptive filters on the basis of the detected synchronization signal; and removing the interference included in the received signals by using the selected adaptive filter.
An operation method for a repeater operating by time division duplexing (TDD), according to one embodiment of the present invention, comprises the steps of: detecting a synchronization signal from received signals; determining the type of a communication interval on the basis of the detected synchronization signal; and controlling the operation of a signal linearizer on the basis of the determined type of communication interval.
According to one or more embodiments of the present invention, a frame processing method of a distributed antenna system may include confirming whether a quality of service (QoS) tag exists in header information of a received frame; performing frame scheduling of the frame based on the QoS tag; and dropping or transmitting the frame according to a transmission priority according to a result of the frame scheduling.
H04L 47/32 - Flow controlCongestion control by discarding or delaying data units, e.g. packets or frames
H04W 28/02 - Traffic management, e.g. flow control or congestion control
H04L 67/61 - Scheduling or organising the servicing of application requests, e.g. requests for application data transmissions using the analysis and optimisation of the required network resources taking into account QoS or priority requirements
H04L 47/2441 - Traffic characterised by specific attributes, e.g. priority or QoS relying on flow classification, e.g. using integrated services [IntServ]
H04L 47/24 - Traffic characterised by specific attributes, e.g. priority or QoS
H04L 47/6275 - Queue scheduling characterised by scheduling criteria for service slots or service orders based on priority
A base station interface module included in a distributed antenna system includes: a separator configured to separate a base station signal input from a base station and output first and second base station signals; a pre-compensator configured to compensate for at least one of an amplitude and a phase of the first base station signal based on a preset compensation value; a first attenuator configured to attenuate the compensated first base station signal and to output the attenuated first base station signal to the distributed antenna system; and a second attenuator configured to attenuate the second base station signal and to terminate the attenuated second base station signal.
A TSN-based distributed antenna system including a headend unit, one or more TSN switches, and one or more remote units and a fronthaul transport network constituted by the headend unit, the TSN switch, and the remote unit is provided. The packet-based fronthaul network constituted by the headend unit, the TSN switch, and the remote unit transmits traffic in a time-deterministic manner while minimizing packet loss through Ethernet to which TSN standards are applied.
H04L 27/34 - Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
H04L 12/709 - Route fault prevention or recovery, e.g. rerouting, route redundancy, virtual router redundancy protocol [VRRP] or hot standby router protocol [HSRP] using path redundancy using M+N parallel active paths
H04L 12/851 - Traffic type related actions, e.g. QoS or priority
H04L 12/721 - Routing procedures, e.g. shortest path routing, source routing, link state routing or distance vector routing
Disclosed is a distributed antenna system (DAS). The DAS includes a DAS controller, which is an OpenFlow controller, and one or more DAS units in order to dynamically control a traffic transmission policy of the DAS units using an OpenFlow protocol, wherein the DAS controller generates and changes a traffic transmission policy by reflecting a traffic transmission policy change request by operator manipulation or a software-defined network supporting application and a need for changing of the traffic transmission policy according to a status of the DAS unit and a status of a port, and the DAS unit transmits received traffic to a destination according to the policy.
H04L 45/64 - Routing or path finding of packets in data switching networks using an overlay routing layer
H04L 45/302 - Route determination based on requested QoS
H04L 47/2441 - Traffic characterised by specific attributes, e.g. priority or QoS relying on flow classification, e.g. using integrated services [IntServ]
The inventive concept relates to a communication device comprising a DPD processor configured to output a plurality of pre-distorted signals by pre-distorting each of a plurality of input signals using an extracted feedback signal, a first signal combiner configured to combine a plurality of feedback signals corresponding to the plurality of pre-distorted signals and output a combined feedback signal, an analog-to-digital converter configured to convert the combined feedback signal into a digital signal and output a digital-converted combined feedback signal and a signal extractor configured to extract the digital-converted combined feedback signal and output the extracted feedback signal.
A communication node processing a communication signal in a distributed antenna system includes a data appearance frequency monitor configured to receive a communication signal including a sign bit string, a count leading zero bit string, and an additional data bit string, and to monitor data appearance frequency in the count leading zero bit string included in the received communication signal, a Huffman encoder configured to encode the count leading zero bit string into a corresponding codeword according to a Huffman encoding algorithm based on the data appearance frequency in the count leading zero bit string and an additional bit allocator configured to allocate additional bits to the additional data bit string when the number of bits in the count leading zero bit string decreases during the encoding process.
H04B 7/02 - Diversity systemsMulti-antenna systems, i.e. transmission or reception using multiple antennas
H04B 7/024 - Co-operative use of antennas at several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
87.
Cellular communication system having a set of small cells as a signal source
An analog distributed antenna system having a set of small cells as a signal source is provided. A proposed cellular communication system includes an upper small cell unit including upper protocol processors configured to process an upper first part of a protocol stack of a small cell, a lower small cell unit including lower protocol processors configured to process a remaining second part of the protocol stack of the small cell, and a first matching switch configured to respectively match the lower protocol processors to a plurality of remote units. According to one aspect, the cellular communication system includes a common controller configured to control activation of the plurality of upper protocol processors of the upper small cell unit and the plurality of lower protocol processors of the lower small cell unit according to a required service capacity and appropriately control an operation of the first matching switch.
A method of operating a repeater comprises detecting a synchronization signal from a received communication signal, identifying a time division duplex (TDD) switching pattern based on a power change of the communication signal over time and switching an uplink operation and a downlink operation of the repeater based on the detected synchronization signal and the TDD switching pattern.
A communication node according to an embodiment of the present invention comprises: a signal monitoring device for receiving a plurality of communication signals transmitted from at least two base stations, and monitoring the bandwidth of each of the received plurality of communication signals; a frame setter for resetting, according to the monitoring result, a frame structure by merging at least some blocks from among blocks in a preset frame structure; and a framer, which includes, according to the reset frame structure, the plurality of communication signals in a block corresponding to the bandwidth of each of the plurality of communication signals so as to frame same into one frame.
According to an aspect of the present disclosure, a method of processing a data stream in a node unit included in a distributed antenna system includes: receiving frame layout information; changing a frame layout of a predetermined transmission frame based on the received frame layout information; and framing a plurality of data streams based on the changed frame layout.
H04B 7/04 - Diversity systemsMulti-antenna systems, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
The present disclosure provides a method of allocating shared radio resources in a spectrum shared system (SSS), the method including: obtaining, by a system controller of the SSS, identification information from at least one radio service device of the SSS and a node unit of a distributed antenna system (DAS); determining, by the system controller of the SSS, whether the at least one radio service device interoperates with the DAS based on the identification information; and allocating, by the system controller of the SSS, the shared radio resources to the at least one radio service device and the DAS, respectively, based on a result of the determining of interoperating.
H04L 5/00 - Arrangements affording multiple use of the transmission path
H04L 1/18 - Automatic repetition systems, e.g. Van Duuren systems
H04L 1/16 - Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
The present disclosure provides a method of allocating shared radio resources in a spectrum shared system (SSS), the method including: obtaining, by a system controller of the SSS, identification information from at least one radio service device of the SSS and a node unit of a distributed antenna system (DAS); determining, by the system controller of the SSS, whether the at least one radio service device interoperates with the DAS based on the identification information; and allocating, by the system controller of the SSS, the shared radio resources to the at least one radio service device and the DAS, respectively, based on a result of the determining of interoperating.
A synchronization detection method of a repeater comprises receiving a communication signal comprising a plurality of synchronization signal blocks respectively belonging to different frequency ranges, determining a priority of a frequency range in which the plurality of synchronization signal blocks are to be detected based on signal level for each frequency range and detecting a synchronization signal block included in each frequency range according to the determined priority.
A communication system comprises a clock generator configured to generate a plurality of system clock signals used to synchronize components included in each of communication nodes in the communication system based on an external clock signal provided by an external clock source located outside the communication system and a physical layer configured to transmit any one of the generated system clock signals to a small cell communicatively connected to an end communication node of the communication system.
The present invention provides a method of optical transmission delay compensation of a system including a main unit and a remote unit, wherein the main unit and the remote unit are connected to each other through an optical transmission line, including: receiving a reference signal, by the remote unit, generated by the main unit through the optical transmission line; analog converting the reference signal and performing analog processing on the reference signal; converting the analog-processed reference signal into an RF signal and radiating the RF signal; and measuring a delay time until the reference signal is generated and radiated as the RF signal. Accordingly, it is possible to obtain an effect of preventing degradation of service quality due to interference by synchronizing remote units and improving the service quality.
H04B 10/00 - Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
H04B 10/079 - Arrangements for monitoring or testing transmission systemsArrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
H04B 10/2575 - Radio-over-fibre, e.g. radio frequency signal modulated onto an optical carrier
H04L 7/04 - Speed or phase control by synchronisation signals
A TSN-based distributed antenna system including a headend unit, one or more TSN switches, and one or more remote units and a fronthaul transport network constituted by the headend unit, the TSN switch, and the remote unit is provided. The packet-based fronthaul network constituted by the headend unit, the TSN switch, and the remote unit transmits traffic in a time-deterministic manner while minimizing packet loss through Ethernet to which TSN standards are applied.
H04L 27/34 - Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
H04L 12/709 - Route fault prevention or recovery, e.g. rerouting, route redundancy, virtual router redundancy protocol [VRRP] or hot standby router protocol [HSRP] using path redundancy using M+N parallel active paths
H04L 12/721 - Routing procedures, e.g. shortest path routing, source routing, link state routing or distance vector routing
H04L 12/851 - Traffic type related actions, e.g. QoS or priority
A distributed antenna system of the present invention implements duplexing by means of: a method for configuring a first headend unit and a second headend unit to be active or on standby, and respectively connecting a hub unit or a remote unit to the first headend unit and the second headend unit so as to perform duplexing; and a method for connecting, through a redundancy link, a hub unit or remote units of a branch group that is connected to each of the headend units and is branched, activating the redundancy link if an error occurs on a frame transmission path according to the control of an active headend unit, and enabling frame transmission through the activated redundancy link by changing the frame transmission path with a change in the logical port state of the hub unit or remote units, which cannot perform frame transmission because of an error.
A method for operating a repeater according to an embodiment of the present invention, comprises a step of detecting a synchronization signal from a received communication signal; a step of identifying a time division duplex (TDD) switching pattern on the basis of a power change over time of the communication signal; and a step of switching an uplink operation and a downlink operation of a repeater on the basis of the detected synchronization signal and the switching pattern.
