Electronics and Telecommunications Research Institute

Hwan Seok Chung

Han Hyub Lee

Kwang Ok Kim

Kyeong Hwan Doo

Seung Hyun Cho

Heuk Park

Sun Hyok Chang

Min Soo Kim

Jung-yeol Oh

Chan Gyo Han

Jong Hyun Lee

Sang Soo Lee

Kwangjoon Kim

Seung-Hyun Cho

Minkyu Sung

Sae Kyoung Kang

Min Kyu Sung

Kwang Joon Kim

Sun Me Kim

Provided are a power management method and apparatus of an ONU supporting a slicing function. A power management method performed by a power management apparatus of an ONU supporting a slicing function includes receiving a first message for discovering a power management attribute of an ONU including at least one slice from an optical line terminal (OLT), transmitting a second message including the power management attribute of the ONU to the OLT in response to the first message received, receiving a third message for setting up a power management parameter for each slice included in the ONU from the OLT, setting up the power management parameter for each slice included in the ONU based on the third message received, and transmitting a fourth message including a set up result of the power management parameter for each slice included in the ONU to the OLT.

Power management method and apparatus of ONU supporting slicing function

Provided are a method of bandwidth allocation for transmitting mobile data and a network device. The bandwidth allocation method includes receiving a cooperative transport interface (CTI) message including a traffic pattern corresponding to a CTI pattern identification (ID) from a distributed unit (DU) of a mobile network, and allocating a bandwidth for transmitting mobile data based on the traffic pattern included in the CTI message.

Method of bandwidth allocation for transmitting mobile data and network device

An optical network using an optical amplifier in a gain saturation region includes an optical transmission apparatus. The optical transmission apparatus includes an optical transmitter configured to output an optical signal, a semiconductor optical amplifier (SOA) configured to amplify the optical signal outputted through the optical transmitter, and a controller configured to control the SOA to operate in a gain saturation region or a linear gain region depending on whether a forward error correction (FEC) function is used in the optical network.

Optical network using optical amplifier in gain saturation region

Provided are an apparatus and a method for allocating a bandwidth for providing a low-latency fronthaul service in a passive optical network. An bandwidth allocating method performed by a bandwidth allocating apparatus included in an OLT includes receiving an actual report message requesting bandwidth allocation from at least one ONU for wired subscribers connected to the OLT, receiving radio scheduling information for at least one ONU for mobile connected to the OLT from a central unit (CU)/digital unit (DU), generating a virtual report message using the radio scheduling information received from the CU/DU, allocating a transmission bandwidth for the at least one ONU for wired subscribers and the at least one ONU for mobile through the received actual report message and the generated virtual report message, and transmitting the allocated transmission bandwidth to the ONU for wired subscribers and the ONU for mobile using a grant message.

Bandwidth allocating apparatus and method for providing low-latency fronthaul service in passive optical network

Provided is a burst mode optical transmitter capable of preventing an optical signal from being output from a light source during burst mode disable time through an arithmetic circuit configured to remove an idle signal included in a MAC electrical signal by using a MAC electrical signal and a burst mode control signal.

Burstmode optical transmitter

Disclosed is a method of registering a new optical network unit (ONU) to be performed by an optical line terminal (OLT). The method includes transmitting a ranging notification message to a centralized unit (CU)/distributed unit (DU) to register the new ONU, receiving scheduling information for registering the new ONU from the CU/DU in response to the ranging notification message, transmitting a serial number request message to a service region in which ONUs are present based on the received scheduling information, and when the serial number response message is received from the new ONU in response to the serial number request message, registering the new ONU that transmits a serial number request message. The transmitting of the serial number request message is performed through a multi-quiet zone of a short period.

Multi-quiet zone-based optical network unit registration method for low-latency service

Disclosed are a function split structure for a mobile convergence optical transmission network and a method of providing coordinated multi-point technology using the same. The mobile convergence optical transmission network may include a centralized unit (CU), a distributed unit (DU) connected to the CU, a transport node (TN) of an optical transmission network connected to the DU via a first interface, an aggregated unit (AU) connected to a transport unit (TU) of the optical transmission network via the first interface, and a radio unit (RU) connected to the AU via a second interface corresponding to a split structure for a lower layer than the first interface.

Function split structure for mobile convergence optical transmission network and method of providing coordinated multi-point technology using the same

Disclosed is a slice connection method of an optical access network and an optical access network system for slice connection. A slice connection method performed by an optical network unit (ONU) of an optical access network system may include determining a service type of a host device transmitting a service connection request, determining a slice based on the service type, sending a request for connection to the slice to an optical line terminal (OLT), and relaying data transmission and reception between the OLT and the host device when a slice connection response corresponding to the request is received from the OLT.

Slice connection method of optical access network and optical access network system for slice connection

An integrated dynamic bandwidth allocation method and apparatus in a passive optical network (PON) are provided. The bandwidth allocation method performed by an optical line terminal (OLT) includes generating a service level agreement (SLA) table including an SLA required for calculation for bandwidth allocation corresponding to at least one service queue included in at least one optical network unit (ONU) connected to the OLT, calculating maximum allocatable bandwidths for respective predetermined cycles based on the generated SLA table, and, when a service queue requiring bandwidth allocation is present in the ONU, performing bandwidth allocation according to different bandwidth allocation methods based on a priority level of the service queue using the calculated maximum allocatable bandwidths.

Integrated dynamic bandwidth allocation method and apparatus in passive optical networks

A method and apparatus for wavelength allocation for bidirectional optical access. The wavelength allocation method sets a first central wavelength for the optical path terminal to perform downstream transmission to the optical network unit, and a second central wavelength for the optical network unit to perform upstream transmission to the optical network terminal. At this time, the first center wavelength and the second center wavelength are separated by a predetermined wavelength interval, and the first center wavelength is set larger than the second center wavelength.

Method and apparatus for wavelength allocation for bidirectional optical access

A cooperative dynamic bandwidth allocation (CO-DBA) method in a structure in which a mobile network and an optical access network are combined allows the mobile network and the optical access network to share mobile scheduling information in advance and allocate bandwidths in advance, and thus prevent a latency in upstream transmission of mobile traffic.

Cooperatiave dynamic bandwidth allocation method in mobile network with optical network, and device of performing the cooperatiave dynamic bandwidth allocation method

A bandwidth allocation apparatus and method for providing a low-latency service in an optical network that may guarantee low-latency requirements and improve a network utilization rate by allocating a static bandwidth to an ONU requiring low latency within an allocable bandwidth and by allocating a dynamic bandwidth to an ONU not requiring the low latency within a remaining bandwidth.

Bandwidth allocation apparatus and method for providing low-latency service in optical network

Wavelength channels used in the optical network system are classified into downstream channels used to transmit optical signals from an optical line terminal (OLT) to an optical network unit (ONU) and upstream channels that are used to transmit optical signals from the ONU to the OLT. The wavelength channels are included in an O-band and may not overlap each other. One of the upstream channels are allocated to a wavelength band (for example, a zero-dispersion window) in which a four-wave mixing occurs. A wavelength spacing between the upstream channels and the downstream channels is determined based on a performance of separating the upstream channels and the downstream channels in a bidirectional optical sub assembly (BOSA) of the ONU. Also, a wavelength spacing between the downstream channels is determined based on a performance of separating the downstream channels in the BOSA.

Optical network system using wavelength channels included in O-band

An optical line terminal (OLT) accumulates and stores a user frame for each physical layer identifier (PLID) to efficiently use a plurality of lanes used for downstream transmission from the OLT to an optical network unit (ONU). The OLT envelopes payloads that are accumulatively stored for the respective PLIDs based on a transmission rate supported by a corresponding ONU, combines an envelope header based on an envelope payload unit, and transmits an envelope frame. The OLT selects an available lane from among a plurality of lanes and may transmit the envelope frame through the selected lane.

Optical line terminal efficiently utilizing multilane and passive optical network comprising the optical line terminal

An optical network unit (ONU) for optical transmission in a burst mode includes an electro-absorption modulated laser (EML) transmitter including a laser diode (LD) and configured to transmit an uplink optical signal through the LD, an electro-absorption modulator (EAM) driver integrated circuit (IC) (EAM driver IC) configured to amplify an uplink data signal and provide the amplified data signal to the EML transmitter, an LD burst-mode driving circuit configured to control an operation of turning on or off the LD based on a burst-enable signal, and a media access control (MAC) configured to transmit the data signal to the EAM driver IC and transmit the burst-enable signal to the LD burst-mode driving circuit.

Growing community of inventors

Daejeon, South Korea

Hwan Seok Chung