Abstract: A method of operating a terminal in a wireless communication system includes transmitting, to a second device, a random access (RA) preamble, receiving, from the second device, a random access response (RAR) message as a response to the RA preamble, performing a radio resource control (RRC) connection procedure with the second device, generating a sift key for communication with the second device, and performing communication through a radio channel with the second device using the sift key.

Abstract: A method and a device used in an optical wireless communication (OWC) system are provided. A transmitting terminal transmits a plurality of reference signals to a receiving terminal through each of a plurality of beams. Each of the plurality of beams may have an inhomogeneous polarization beam pattern. The receiving terminal measures signal strength and polarization with respect to the plurality of reference signals. When the receiving terminal transmits feedback information including the measured signal strength information and polarization information to the transmitting terminal, the transmitting terminal may select at least one beam among the plurality of beams on the basis of the feedback information. Alternatively, the receiving terminal may select at least one beam from among the plurality of beams, which corresponds to at least one inhomogeneous polarization beam pattern among a plurality of inhomogeneous polarization beam patterns, on the basis of the measured signal strength and polarization.

Abstract: The present specification provides a quantum secure direct communication (QSDC) method by which a transmitting end transmits a message on the basis of differential time coding, in a quantum communication system.

Abstract: The present disclosure provides a method for carrying out user authentication in a quantum communication system.

Abstract: A method performed by Charlie in a quantum communication system, according to one embodiment of the present disclosure, may comprise the steps of: forming a first Bell-state resource between a first qubit and a qubit included in Alice; forming a second Bell-state resource between a second qubit and a qubit included in Bob; transforming, into a first Greenberger-Horne-Zeilinger (GHZ) state, a three-qubit state from among the second qubit, a third qubit, and the qubit included in Bob; performing a Bell-state measurement between the first qubit and the second qubit; transforming, on the basis of the Bell-state measurement performing result, a three-qubit state from among the third qubit, the qubit included in Alice, and the qubit included in Bob into a second GHZ state, and performing entanglement teleportation by using the second GHZ state as a resource.

Abstract: The present specification provides a method for transmitting information in a quantum communication system.

Abstract: In order to provide device and method for adjusting split point in wireless communication system, a method of operating a terminal in a wireless communication system may comprise requesting a base station for uplink channel quality information, receiving, from the base station, the uplink channel quality information, determining a first split point based on the channel quality information, performing first split inference based on the determined first split point and transmitting, to the base station, first split inference result information.

Abstract: A communication system supporting quantum key distribution is disclosed. A method performed by a first device comprises transmitting or receiving a random access (RA) preamble to or from a second device, receiving or transmitting a random access response (RAR) message from or to the second device as a response to the RA preamble, performing a radio resource control (RRC) connection procedure with the second device, generating a sift key for communication with the second device and performing communication through a radio channel with the second device using the sift key.

Abstract: A method for performing reinforcement learning by a V2X communication device in an autonomous driving system, specifically, a method for performing reinforcement learning in consideration of an application rate of a reward according to age in terms of the freshness of a reward for an action, is proposed. An agent transmits an action message and controls a reflection rate of a reward through AoI management for a reward message, so that rewards transmitted from a plurality of devices are suitably reflected in an environment of a reinforcement learning-based autonomous driving system, and an optimal policy can be found accordingly.

Abstract: The present specification provides a method for estimating a quantum bit error rate (QBER) for key information, performed by a device in a quantum cryptography communication system, the method and device being characterized by: receiving a random access (RA) preamble from another device; transmitting a random access response (RAR) to the other device, in response to the RA preamble, performing a radio resource control (RRC) connection process with the other device; receiving data from the other device; and decoding the data on the basis of the key information, wherein the key information is determined on the basis of estimation of the QBER, and the device estimates the QBER on the basis of first two-dimensional parity information received from the other device through a public channel.

Abstract: A method performed by means of a first wireless device in a wireless communication system, according to one embodiment of the present specification, comprises the steps of: transmitting, to a second wireless device, a first signal to which a first specific beam is applied; transmitting, to the second wireless device, a second signal to which a second specific beam is applied; receiving, from the second wireless device, feedback information generated on the basis of the first signal and the second signal; and determining, on the basis of the feedback information, a beam related to the second wireless device.

Abstract: A method performed by a first wireless device in a wireless communication system, according to one embodiment of the present specification, comprises the steps of: transmitting, to a second wireless device, a signal to which a specific beam is applied; receiving, from the second wireless device, feedback information generated on the basis of the signal; and determining, on the basis of the feedback information, a beam related to the second wireless device.

Abstract: A method for performing reinforcement learning by a V2X communication device in an autonomous driving system, specifically, a method for performing reinforcement learning in consideration of a reward application ratio over time, is proposed. Action information is transmitted to a second V2X communication device, reward information is received from the second V2X communication device, and reinforcement learning is performed on the basis of a reward, wherein a reward corresponding to a ratio determined by a first V2X communication device is applied to the reinforcement learning, the ratio is determined on the basis of a time interval from a time point of transmission of the action information to a time point of reception of the reward information, and the ratio is between 0 and 1, both inclusive.

Abstract: The present specification provides a method, performed by an apparatus, for transmitting at least one beam in a wireless communication system, the method comprising transmitting the at least one beam to another apparatus and receiving information about a result of measuring the at least one beam from the other apparatus, wherein the at least one beam is a beam generated on the basis of a signal synthesized from a laser signal being incident on a meta surface from a power controller, the laser signal consists of a plurality of frequency components, the synthesized signal is a signal in which power amplification is applied to each of the plurality of frequency components, and the power amplification is applied on the basis of the intensity regarding each of the plurality of frequency components.

Abstract: The present invention relates to a method of transmitting a Medium Access Control (MAC) Protocol Data Unit (PDU) by a user equipment (UE) in a wireless communication system. Especially, the method includes the steps of generating a first MAC PDU including at least one MAC Control Element (CE) and a first data; receiving an uplink grant for transmitting a second data, wherein a transmission time of the first data overlaps with a transmission time of the second data, and wherein a priority of the second data is higher than a priority of the first data; generating a second MAC PDU including the at least one MAC CE and the second data; and transmitting the second MAC PDU.

Abstract: The present specification provides a method and a device, the method, performed by a device, for transmitting a first pulse train in a quantum communication system being characterized by: receiving a random access (RA) preamble from another device; transmitting an RA response (RAR) to the other device as a response to the RA preamble; performing a radio resource control (RRC) connection process with the other device; receiving data from the other device; and decoding the data on the basis of key information, wherein a first pulse train is generated in a laser diode of the device, and the key information is determined on the basis that the first pulse train passes through both a first path and a second path and is then transmitted from the device to the other device via a quantum channel.

Abstract: Provided is a method and device for correcting an error in a communication system, the method including: transmitting, to another device, data encrypted based on key information. The key information is obtained by: incident a detection pulse on a variable Faraday rotating mirror and a reference pulse on a first mirror, respectively, wherein the detection pulse and the reference pulse are pulses branched from a test pulse; generating a first current in a balanced photodetector (BPD) based on a first component obtained as the detection pulse is reflected from the variable Faraday rotating mirror and a second component obtained as the reference pulse is reflected from the first mirror; converting the first current into a second current; incident the second current on the variable Faraday rotating mirror; and correcting the error in the variable Faraday rotating mirror based on the incident second current.

Abstract: Provided is an operation method of a first node in a communication system, according to various embodiments of the present disclosure, the method comprising the steps of: receiving one or more synchronization signals from a second node; receiving system information from the second node; identifying, for a bit flip channel, a bit correlation of a first number of n first qubits constituting an entanglement state between the first node and the second node; generating, on the basis of the bit correlation, a second number of n?1 auxiliary qubits; after an interaction with respect to the bit flip channel occurs, determining, on the basis of the second number of n?1 auxiliary qubits, whether a bit flip error has occurred with respect the entanglement state; and, if the bit flip error is determined to have occurred, carrying out error correction by means of a bit flip operation for the first qubits.

Abstract: The present disclosure relates to a quantum communication system. Particularly, the present disclosure relates to a device and a method for performing two-step quantum secure direct communication (QSDC) with a reduced complexity without measuring a quantum memory and a bell state of a receiver in a quantum communication system.

Abstract: A method and a device used in an optical wireless communication (OWC) system are provided. A transmitting terminal transmits a plurality of reference signals to a receiving terminal through each of a plurality of beams. Each of the plurality of beams may have an inhomogeneous polarization beam pattern. The receiving terminal measures signal strength and polarization with respect to the plurality of reference signals. When the receiving terminal transmits feedback information including the measured signal strength information and polarization information to the transmitting terminal, the transmitting terminal may select at least one beam among the plurality of beams on the basis of the feedback information. Alternatively, the receiving terminal may select at least one beam from among the plurality of beams, which corresponds to at least one inhomogeneous polarization beam pattern among a plurality of inhomogeneous polarization beam patterns, on the basis of the measured signal strength and polarization.