Abstract: A method for paging in sidelink communication include the steps of: receiving window configuration information from a base station; performing a first resource sensing operation for transmission of a paging message within A window indicated by the window configuration information to determine P candidate resources; performing an operation of selecting a P transmission resource from among the P candidate resources within B window indicated by the window configuration information, and a second resource sensing operation for transmission of data associated with the paging message; and transmitting the paging message to a receiving terminal by use of the P transmission resource.

Abstract: In a method and a device for link recovery in a sidelink relay communication, an operating method of a transmission terminal includes: performing a first SL relay communication with a reception terminal through a first relay terminal; when a preconfigured condition is satisfied, declaring an RLF for a sidelink in which the first SL relay communication is performed; establishing a connection with a second relay terminal; and performing a second SL relay communication with the reception terminal through the second relay terminal.

Abstract: A method and an apparatus for transmitting and receiving HARQ response in sidelink communication are provided. The operation method of a first terminal includes receiving DCI for scheduling sidelink transmission from a base station and transmitting first sidelink data to a second terminal based on the DCI. A first SL HARQ response is received for the first sidelink data from the second terminal via a PSFCH. The first SL HARQ response is transmitted to the base station via a PUCCH at a feedback timing indicated by first information included in the DCI.

Abstract: A transmitting terminal in a communication system, the transmitting terminal including a processor, and a memory storing one or more instruction executable by the processor. The transmitting terminal is configured to transmit, to a receiving terminal, first data based on a first retransmission scheme; in response to a preconfigured condition being satisfied, switch a retransmission scheme from the first retransmission scheme to a second retransmission scheme; and transmit, to the receiving terminal, second data based on the second retransmission scheme. The first retransmission scheme and the second retransmission scheme are distinguished according to whether a hybrid automatic repeat request (HARD) feedback is transmitted.

Abstract: An operation method of a first terminal in a communication system is provided. The method includes transmitting, to a base station, a configuration request message requesting configuration of a sidelink (SL) bandwidth part (BWP) used for sidelink communication between the first terminal and a second terminal. A configuration information message is received including configuration information of the SL BWP from the base station. The sidelink communication is performed with the second terminal using one or more SL BWPs indicated by the configuration information and in response to determining that reconfiguration of the one or more SL BWPs is necessary, a reconfiguration request message is transmitted to the base station.

Abstract: Disclosed are a method and a device for group handover in a communication system. An operation method of a header terminal comprises the steps of: transmitting a configuration information message including a first indicator indicating a measurement reporting subject to member terminals participating in the sidelink groupcast communication; if the measurement reporting subject indicated by the first indicator is the header terminal, receiving, from the member terminals, measurement reporting messages including results of measurement operations performed for at least one neighboring base station; and transmitting a configuration reporting message including the results of the measurement operations to a serving base station accessed by the header terminal. Therefore, the performance of the communication system can be improved.

Abstract: An operation method of a first terminal in a communication system is provided. The method includes transmitting information that indicates a delay bound value of a sidelink (SL) channel state information (CSI) report to a second terminal. Sidelink control information (SCI) including CSI request information in transmitted to the second terminal. A monitoring operation is performed to receive the SL CSI of the second terminal within a time period corresponding to the delay bound value from a time of transmitting the CSI request information.

Abstract: Disclosed are a method and an apparatus for transmitting and receiving sidelink data in a communication system. Then operation method of a first terminal includes generating a first stage SCI including first information indicating a number of layers for transmission of sidelink data and transmitting the first stage SCI to a second terminal. The sidelink data is then transmitted to the second terminal through one or more layers indicated by the first information included in the first stage SCI.

Abstract: Disclosed are a method and a device for retransmission in sidelink communication. An operation method of a transmission terminal comprises the steps of: transmitting first data to a reception terminal on the basis of a first retransmission scheme; transmitting, to the reception terminal, SCI including a first indicator indicating switching of a retransmission scheme and a second indicator indicating whether to reuse a resource reserved for the first retransmission scheme; and transmitting second data to the reception terminal on the basis of a second retransmission scheme started by the SCI.

Abstract: A method and a device for paging in sidelink communication are disclosed. An operating method of a transmitting terminal comprises the steps of: receiving SL paging setup information from a base station; receiving a paging DCI from the base station in an SPO indicated by the SL paging setup information; and transmitting an SL paging message to one or more receiving terminals in a sidelink resource indicated by the paging DCI.

Abstract: An operation method of a first communication node in a vehicle-to-everything (V2X) communication system may include: receiving, by the first communication node, control information including resource allocation information from a second communication node; receiving, by the first communication node, data from the second communication node through a radio resource indicated by the resource allocation information included in the control information; generating, by the first communication node, sidelink control information (SCI) including reception configuration information indicating the radio resource used for transmission of the data by the second communication node based on the resource allocation information; and transmitting, by the first communication node, the SCI to a third communication node.

Abstract: An operation method of a first terminal, in a communication system supporting sidelink communication, may include transmitting one or more sidelink data to a second terminal; performing a monitoring operation to receive one or more hybrid automatic repeat request (HARQ) responses for the one or more sidelink data from the second terminal; and declaring a radio link failure (RLF) for a radio link between the first terminal and the second terminal when the one or more HARQ responses indicate a discontinuous transmission (DTX).

Abstract: A method and an apparatus for sidelink communication using a reserved resource in a communication system are disclosed. The operation method of a first terminal may comprise the steps of: generating SCI including a first information element indicating the presence or absence of transmission of SL data #1 using a reserved resource after transmission of SL data #0; transmitting the SCI to a second terminal; and transmitting the SL data #0 to the second terminal on the basis of the SCI.

Abstract: An operation method of a first terminal in a communication system is provided. The method includes transmitting first SCI to a second terminal, the first SCI including one or more information elements among information indicating time resource(s) for sidelink communication, information indicating frequency resource(s) for the sidelink communication, information indicating a periodicity of physical resources for the sidelink communication, and information indicating an MCS for the sidelink communication. Second SCI is transmitted to the second terminal, the second SCI including information for an HARQ feedback operation and information indicating an NDI. The method further includes performing the sidelink communication with the second terminal based on the first SCI and the second SCI associated with the first SCI.

Abstract: Disclosed are a method and apparatus for reporting channel state information for sidelink communication. An operating method for a first terminal comprises the steps of: transmitting, to a second terminal, first step SCI including resource allocation information; transmitting, to the second terminal, second step SCI including CSI request information; and when the CSI request information indicates a request for a CSI report, receiving, from the second terminal, a message including SL CSI in a resource indicated by the resource allocation information.

Abstract: A method and an apparatus for transmitting and receiving reference signals for sidelink communication are provided. The operation method of a first terminal includes receiving a message including a first DMRS scrambling identifier for sidelink communication from a base station and calculating a first DMRS sequence based on the first DMRS scrambling identifier. Additionally, the method includes transmitting SCI and a first DMRS generated based on the first DMRS sequence to a second terminal.

Abstract: A sidelink communication method performed by a UE is provided. The method includes receiving from a base station a message including zone configuration information and resource pool configuration information and selecting a zone type mapped to a speed of the UE among zone types indicated by the zone configuration information. A zone identifier is determined based on configuration information of the selected zone type, the configuration information of the selected zone type being included in the zone configuration information. The sidelink communication is performed using a resource pool mapped to the zone identifier among resource pools indicated by the resource pool configuration information.

Abstract: An operation method of a first communication node in a vehicle-to-everything (V2X) communication system may include: receiving, by the first communication node, control information including resource allocation information from a second communication node; receiving, by the first communication node, data from the second communication node through a radio resource indicated by the resource allocation information included in the control information; generating, by the first communication node, sidelink control information (SCI) including reception configuration information indicating the radio resource used for transmission of the data by the second communication node based on the resource allocation information; and transmitting, by the first communication node, the SCI to a third communication node.

Abstract: A sidelink communication method performed by a UE includes receiving from a base station a message including first configuration information of a common resource pool and second configuration information for an occupancy state reporting of the common resource pool. The method also includes receiving from the base station an indicator indicating resources used for sidelink communication within the common resource pool by performing a monitoring operation on resources indicated by the second configuration information and performing sidelink communication using resources other than the resources indicated by the indicator within the common resource pool indicated by the first configuration information.

Abstract: An operation method of a first terminal in a communication system is provided. The method includes transmitting first SCI to a second terminal, the first SCI including one or more information elements among information indicating time resource(s) for sidelink communication, information indicating frequency resource(s) for the sidelink communication, information indicating a periodicity of physical resources for the sidelink communication, and information indicating an MCS for the sidelink communication. Second SCI is transmitted to the second terminal, the second SCI including information for an HARQ feedback operation and information indicating an NDI. The method further includes performing the sidelink communication with the second terminal based on the first SCI and the second SCI associated with the first SCI.