Electronics and Telecommunications Research Institute

Chosun University

Mi Young Yun

Sung Cheol Chang

Chul Sik Yoon

Won-Ik Kim

Hyun Jun Lee

Sung Kyung Kim

Seokki Kim

Ji Hyung Kim

Jae Heung Kim

Kwang Jae Lim

Eunkyung Kim

Sang Ho Lee

Jung Mo Moon

Dae Ik Kim

Eun Hee Hyun

Kyoung Seok Lee

Jae Ho Kim

Seung Kwon Baek

Jae Su Song

Yeong Jin Kim

Seok Ki Kim

Jee Hyeon Na

Chul Min Park

Jae Sheung Shin

Sun Hwa Lim

Jai Hyung Cho

Won Ik Kim

Hyun Suk Roh

Seokjoo Shin

Eun Ah Kim

Eun Kyung Kim

Tae Joong Kim

Jae Sun Cha

Doug Young Suh

Anseok Lee

Soo Jung Jung

Dae Sik Kim

Seung Kwon Cho

Yun Hee Cho

Ho Choong Cho

Chul Keun Kim

Sei Yun Shin

Hochoong Cho

Eun Ju Park

Sung Pil Shin

An operation method of a terminal in a communication system may include: estimating a propagation delay between the terminal and a first satellite, the first satellite being connected to the terminal and a base station of the communication system; estimating a terminal-specific TA value based on the propagation delay; transmitting, to the base station, a terminal-specific TA report based on the terminal-specific TA value; and performing update of a first TA value for communication with the base station based on the terminal-specific TA value, wherein a time point at which the update of the first TA value is performed is determined based on a first response of the base station to the terminal-specific TA report.

Method and apparatus for timing synchronization in communication system

A handover method for a satellite base station, performed by a terminal, may comprise selecting at least one candidate satellite base station; performing signal strength measurement on a first candidate satellite base station among the at least one candidate satellite base station; in response to determining that the first candidate satellite base station is available according to a result of the signal strength measurement, selecting the first candidate satellite base station as a target satellite base station; and in response to determining that the first candidate satellite base station is not available according to the result of the signal strength measurement, performing signal strength measurement on a second candidate satellite base station among the at least one candidate satellite base station.

Method and apparatus for signal configuration for mobile base station

A handover method performed by a terminal in a non-terrestrial network may comprise transmitting a measurement report including measurement results for neighbor cells to a serving satellite base station; receiving, from the serving satellite base station, connection configuration information for at least one target base station candidate and information on an activation time when the connection configuration information for the at least one target base station candidate is activated; and performing a handover to a first target base station candidate among the at least one target base station candidate based on information received from the at least one target base station candidate at the activation time.

Method for handover in non-terrestrial network, and apparatus for the same

Disclosed are operation methods of communication node supporting direct communications in network. The operation method may comprise generating control information which includes parameters used for transmitting and receiving data; transmitting, to a second UE, the control information through a physical sidelink control channel (PSCCH); and transmitting, to the second UE, the data through a physical sidelink shared channel (PSSCH) based on the parameters. Therefore, a performance of the network can be enhanced.

Operation method of communication node supporting direct communication in network

Disclosed are a method and an apparatus for configuring a path in a communication system including an Xhaul network. A method for changing a path, performed by a first XDU, may comprise receiving from the XCU a path setup request message requesting to change a first path between the second XDU and the third XDU to a second path between the first XDU and the third XDU; receiving an SN status transfer message including an SN of data for the third XDU from the second XDU belonging to the first path, when the path setup request message is received; receiving from the second XDU the data corresponding to the SN indicated by the SN status transfer message; configuring the second path with the third XDU; and transmitting the data received from the second XDU to the third XDU through the second path.

Method and apparatus for configuring path in communication system including Xhaul network

Disclosed are operation methods of communication node supporting direct communications in network. The operation method comprises obtaining scheduling information configured for the direct communications from a first base station; identifying modulation and coding scheme (MCS) information and radio resource information included in the scheduling information; and transmitting, to a second UE, a first message to which a MCS indicated by the MCS information is applied through radio resources indicated by the radio resource information. Therefore, performance of a communication system can be enhanced.

Operation methods of communication node supporting direct communications in network

An operation method of a first communication node, which controls a plurality of communication nodes included in a mobile xhaul network supporting mobility, may comprise performing an attach procedure between the first communication node and a second communication node among the plurality of communication nodes; configuring a path for communications between the second communication node and a third communication node for which attach procedure has been completed among the plurality of communication nodes; and supporting communications of the second communication node and the third communication node using the configured path.

Operation method of communication node supporting mobility in communication network

Disclosed is an authentication method of a wireless mesh network capable of reducing overload and communication delay during authentication procedure by performing authentication between nodes without accessing an authentication server. The authentication method of a wireless mesh network according to an exemplary embodiment of the present disclosure includes: selecting, by a new node, a first neighbor node among one or more adjacent nodes; transmitting, by the new node, an authentication request message including a public key of the new node; authenticating, by the first neighbor node, the public key of the new node; transmitting, by the first neighbor node, an authentication response message including a public key of the first neighbor node to the new node; and authenticating, by the new node, the public key of the first neighbor node; transmitting, by the new node, an authentication identification message to the first neighbor node.

Authentication method of wireless mesh network

A signaling method for a terminal that performs direct communication between terminals terminal is disclosed. A transmitting terminal transmits a link establishment request message for establishing a link to a receiving terminal, and the receiving terminal transmits a link establishment response message responding to this message to the transmitting terminal. The link establishment request message includes a field indicating a flow to use if the receiving terminal acquires a token.

Signalling method for direct communication between terminals

In a direct communication between terminals, a terminal transmits a synchronization channel preamble part after transmitting a synchronization channel message part including synchronization information. The terminal receives a dedicated channel including a direct communication packet after transmitting the synchronization channel preamble part. A transition time gap for switching from transmission to reception may be inserted to an end of the synchronization channel preamble part.

Method and apparatus for transmitting synchronization channel, and method and apparatus for receiving synchronization channel

A communication method of a terminal that can operate in a relay mode or a base station mode is provided. When the terminal, having received a service from a first base station, detects that a service connection to the first base station is unavailable, the terminal searches for a second base station, which is an available neighboring base station. The terminal transmits a ranging request message including a base station identifier of the first base station to the second base station.

Terminal and communication method thereof

Referring to FIG., if the direct communication terminal, among the direct communication terminalsandreceiving a downlink multicast service from the base stationthrough the forwarding terminal, wants to be a talker, the direct communication terminalperforms a unicast connection establishment procedure with the forwarding terminal, in order to transmit an uplink unicast packet.

Method of direct communication between terminals respectively connected and unconnected to base station

A method of managing a resource is provided by a base station. The base station allocates a resource to a terminal, and generates a downlink control channel including information of the allocated resource and a transmission time of a next downlink control channel. Further, the base station transmits the downlink control channel to the terminal.

Method and apparatus for managing resource

Growing community of inventors

Daejeon, South Korea

Mi Young Yun