Abstract: Disclosed is a technique for switching from a master node to a secondary node in a communication system. A method of a first communication node may comprise: adding the first communication node as a primary secondary cell (PSCell) to a second communication node through dual connectivity (DC); generating a first user plane path for smart dynamic switching (SDS) and a first instance for supporting the first user plane path according to a request from the second communication node; transmitting information on the first user plane path and the first instance to a terminal; receiving user data based on the first user plane path from the terminal as the first instance; and transmitting the user data to a core network using the first user plane path.

Abstract: The present invention relates to an image compensation device for an image for augmented reality. The image compensation device includes: a compensation function determination unit configured to determine a compensation function for compensating the luminance information of an observed image observed by a user through an optical device for augmented reality when an original image for augmented reality is output from an image output unit; and a pre-compensated image information generation unit configured to generate pre-compensated image information for augmented reality based on the compensation function determined by the compensation function determination unit and original image information for augmented reality.

Abstract: The present invention provides an optical device for augmented reality having a function of adjusting the depth of a virtual image, the optical device including: a display unit configured to display a virtual image; focusing optics configured to refract or reflect virtual image light; a reflective unit including a plurality of reflective modules configured to provide the virtual image to a user; an optical means provided with the reflective unit installed therein, and configured to transmit real object image light toward a pupil of the user's eye; a position adjustment device configured to move at least one of the display unit and the focusing optics in a direction parallel to the optical axis of the focusing optics; a focal length tracking unit configured to measure the focal length of the user; and a control unit configured to control the movement of the position adjustment device.

Abstract: An operation method of a central control apparatus in a communication system may include: configuring a unit cluster using a first transceiver and a second transceiver; performing first scheduling so that at least one port among N ports of the first transceiver and M ports of the second transceiver provides communication services to a service coverage of the unit cluster for each scheduling period in a beam sweeping scheme by using a first sub-frequency band; generating first scheduling information including information on identifiers of transceivers and indexes of ports proving the communication services for each scheduling period according to the first scheduling, and transmitting the first scheduling information to the terminal; and controlling the first transceiver and the second transceiver to communicate with the terminal according to the first scheduling information.

Abstract: The present invention relates to an image compensation device for an image for augmented reality. The image compensation device includes: a compensation function determination unit configured to determine a compensation function for compensating the luminance information of an observed image observed by a user through an optical device for augmented reality when an original image for augmented reality is output from an image output unit; and a pre-compensated image information generation unit configured to generate pre-compensated image information for augmented reality based on the compensation function determined by the compensation function determination unit and original image information for augmented reality.

Abstract: An operation method of a communication node in a millimeter-wave based communication system may comprise when a first communication path between the second base station and the terminal connected to the first base station is not established, transmitting a radio resource control (RRC) request message requesting establishment of the first communication path to the second base station via the first base station; receiving an RRC response message from the second base station via the first base station, the RRC response message being a response to the RRC request message; and establishing the first communication path based on the RRC response message.

Abstract: An operation method of a first cell in a communication system may include: receiving, from a first communication node that is an upper node of the first cell, a first signal including second cell configuration information of a second cell connected with the first communication node and a second communication node that is a lower node of the first cell; identifying, based on the first signal, that the first cell and the second cell are jointly operated by the first communication node as coordinative PCells; transmitting, to the second communication node, a second signal including information on joint operations of the coordinative PCells by the first communication node; and performing communication with the first communication node and the second communication node based on the joint operations of the coordinative PCells.

Abstract: A apparatus and a method thereof for managing access nodes for a low-latency service in a multi-radio multi-connectivity network are proposed. The method of operating user equipment (UE) in a wireless communication system includes a process of scanning a plurality of secondary nodes (SNs) where radio signals are measured around the UE, a process of transmitting a scanning result to a master node (MN), a process of receiving information about an SN group from the MN, a process of accessing an active SN on the basis of the information about the SN group, and a process of transmitting a message for establishing and modifying a protocol data unit (PDU) session to a core network (CN).

Abstract: An operation method of a terminal in a communication system may comprise: obtaining a plurality of serving beam measurement values by performing measurement on a plurality of serving beams; identifying a minimum measurement value among the plurality of serving beam measurement values; obtaining a plurality of beam measurement values by performing measurement on a plurality of beams received from a plurality of base stations included in the communication system; determining whether a first condition is satisfied, the first condition being defined based on a result of comparison between the plurality of beam measurement values and a sum of the minimum measurement value and a first offset; and in response to determining that the first condition satisfied, performing communication with at least part of the plurality of serving base stations and a first base station forming a first beam satisfying the first condition.

Abstract: A method for controlling base stations in a wireless communication system may include: performing a monitoring operation on a first base station forming a first cell in a predetermined communication area; determining whether the first base station needs to be replaced; when the first base station needs to be replaced, controlling a second base station to move in a direction of the first base station and form a second cell; when coverages of the first and second cells overlap fully or partially, decreasing a transmit power of the first base station and increasing a transmit power of the second base station; and in response to identifying that all of one or more communication nodes connected to the first cell are handed over to the second base station, determining that the first base station is successfully replaced with the second base station.

Abstract: The present invention is directed to an optical apparatus for augmented reality with a vision correction function. The optical apparatus for augmented reality with a vision correction function includes: an image output unit configured to output augmented reality image light; a reflective unit configured to transfer the augmented reality image light to the pupil of a user's eye; and an optical means configured such that the reflective unit is disposed therein, and configured to transmit therethrough at least part of real object image light toward the pupil of the user's eye; wherein the optical means includes a first surface and a second surface; wherein the reflective unit is disposed inside between the first and second surfaces of the optical means; and wherein at least any one of the first and second surfaces of the optical means is formed as a curved surface.

Abstract: The present invention provides an optical device for augmented reality, the optical device including: an optical means for transmitting at least part of visible light therethrough; and a reflective unit disposed on the surface of or in the inside of the optical means, and configured to reflect image light corresponding to an image for augmented reality, output from an image output unit, toward the pupil of an eye of a user; wherein the reflective unit is formed in an asymmetric shape representing a shape other than a point-symmetric shape; and wherein the point-symmetric shape is a shape in which there is a specific point that allows the shape to be always the same for all rotation angles when the reflective unit is rotated around a specific point on the plane of the reflective unit, and the asymmetric shape is a shape that is not the point-symmetric shape.

Abstract: An operation method of a central control apparatus in a communication system may include: configuring a unit cluster using a first transceiver and a second transceiver; performing first scheduling so that at least one port among N ports of the first transceiver and M ports of the second transceiver provides communication services to a service coverage of the unit cluster for each scheduling period in a beam sweeping scheme by using a first sub-frequency band; generating first scheduling information including information on identifiers of transceivers and indexes of ports proving the communication services for each scheduling period according to the first scheduling, and transmitting the first scheduling information to the terminal; and controlling the first transceiver and the second transceiver to communicate with the terminal according to the first scheduling information.

Abstract: A beam alignment method performed by a first communication node in a communication system may comprise: identifying a position of a first antenna of the first communication node; configuring a first coordinate system based on a physical position and direction of the first antenna, based on information on the position of the first antenna; identifying a position of a second antenna of a second communication node of the communication system; converting information on the position of the second antenna into coordinate information based on the first coordinate system; calculating direction change values of the first antenna based on the information on the position of the second antenna, which is converted based on the first coordinate system; changing a direction of the first antenna based on the direction change values of the first antenna; and updating a beam alignment state between the first and second antennas.

Abstract: A communication device for an ultra-high-speed vehicle comprises a processor for performing a radio resource control function for communication between a first mobile device and the communication device, and a plurality of distributed antennas (DAs) positioned in a path of the first mobile device and transmitting or receiving a signal according to a control of the processor. The communication device also comprises a memory for storing at least one command executed by the processor. The at least one command is executed to configure a first sliding window including n DAs corresponding to a first position of the first mobile device, among the plurality of DAs, and perform communication with the first mobile device located at the first position by using the n DAs. Therefore, the performance of a communication system can be improved.

Abstract: The present invention relates to an optical device for augmented reality, and provides an optical device for augmented reality, the optical device including: a plurality of reflective units arranged to reflect image light, output from an image output unit configured to output image light corresponding to an image for augmented reality, toward the pupil of an eye of an user; wherein each of the plurality of reflective units is disposed such that the distance to an adjacent reflective unit is 8 mm or less.

Abstract: An operation method of a communication node in a millimeter-wave based communication system may comprise when a first communication path between the second base station and the terminal connected to the first base station is not established, transmitting a radio resource control (RRC) request message requesting establishment of the first communication path to the second base station via the first base station; receiving an RRC response message from the second base station via the first base station, the RRC response message being a response to the RRC request message; and establishing the first communication path based on the RRC response message.

Abstract: The present invention provides an optical device for augmented reality, the optical device including: an optical means for transmitting at least part of visible light therethrough; and a reflective unit disposed on the surface of or in the inside of the optical means, and configured to reflect image light corresponding to an image for augmented reality, output from an image output unit, toward the pupil of an eye of a user; wherein the reflective unit is formed in an asymmetric shape representing a shape other than a point-symmetric shape; and wherein the point-symmetric shape is a shape in which there is a specific point that allows the shape to be always the same for all rotation angles when the reflective unit is rotated around a specific point on the plane of the reflective unit, and the asymmetric shape is a shape that is not the point-symmetric shape.

Abstract: The present invention provides an optical device for augmented reality, the optical device including: an optical means for transmitting at least part of visible light therethrough; and a reflective unit group including a plurality of reflective units disposed in a line along a first direction, which is any straight-line direction, on the surface of the optical means or inside the optical means; wherein the reflective units reflect image light, output from an image output unit configured to output image light corresponding to an image for augmented reality, toward the pupil of an eye of a user.

Abstract: An operation method of a communication node in a millimeter-wave based communication system may comprise when a first communication path between the second base station and the terminal connected to the first base station is not established, transmitting a radio resource control (RRC) request message requesting establishment of the first communication path to the second base station via the first base station; receiving an RRC response message from the second base station via the first base station, the RRC response message being a response to the RRC request message; and establishing the first communication path based on the RRC response message.