Abstract: A method by which a terminal operating in an unlicensed band transmits a signal includes the steps of: receiving, from a base station, configuration information about a carrier; receiving configuration information for configuring N (where N is an integer) guard band(s) for some frequency domains of the carrier; and transmitting a signal to the base station by using a first frequency domain of a bandwidth part belonging to the carrier, wherein the first frequency domain can be a domain excluding the N guard band(s) from the frequency domain of the bandwidth part.

Abstract: A method of a terminal may comprise: receiving, from a base station, configuration information of uplink reference signal (UL RS) for two or more serving cells; transmitting a first UL RS to the base station based on the configuration information in a first cell of the two or more serving cells; and transmitting a second UL RS to the base station based on the configuration information in a second cell of the two or more serving cells.

Abstract: A method may comprise: generating first and second FA sequences corresponding to first and second FAs, respectively, based on a first sequence; mapping elements of first and second FA signals, which are respectively generated by modulating the first and second FA sequences, to first and second subcarrier groups corresponding to the first and second FAs, first base station, and first symbol; generating third and fourth FA sequences corresponding to the first and second FAs, respectively, based on a second sequence; mapping elements of third and fourth FA signals, which are respectively generated by modulating the first and second FA sequences, to third and fourth subcarrier groups corresponding to the first and second FAs, second base station, and second symbol; and transmitting a first transmission signal including the first and second FA signals, and a second transmission signal including the third and fourth FA signals.

Abstract: Disclosed are various methods for transmitting or receiving data or control information having high reliability conditions. A method for operating a terminal which transmits uplink control information (UCI) includes: a step of generating UCI; a step of comparing the priority of an uplink (UL) control channel for the transmission of the UCI with the priority of a UL data channel when some symbols of the UL control channel and the UL data channel overlap; and a step of selecting the UL channel having a higher priority among the UL control channel and the UL data channel, and transmitting the UCI to a base station through the selected UL channel.

Abstract: Disclosed are a method and an apparatus for transmitting or receiving uplink feedback information in a communication system. An operation method of a terminal may comprise receiving downlink control information (DCI) from a base station, the DCI including resource allocation information of a physical downlink shared channel (PDSCH); receiving data #n from the base station through the PDSCH indicated by the DCI; generating a hybrid automatic repeat request (HARQ) codebook including an HARQ response bit #n for the data #n and an HARQ response bit #n-1 for data #n-1 received from the base station before the data #n; and transmitting the HARQ codebook to the base station. Therefore, the performance of the communication system can be improved.

Abstract: A method for transmitting data in sidelink communication, performed by a transmitting terminal, may comprise transmitting first control information including first resource allocation information for a first data transmission resource and second resource allocation information for a second data transmission resource; transmitting data through the first data transmission resource; transmitting second control information including the first resource allocation information for the first data transmission resource and the second resource allocation information for the second data transmission resource; and transmitting data through the second data transmission resource.

Abstract: Disclosed is a method for configuring a bandwidth for supporting a broadband carrier in a communication system. An operation method of a base station comprises the steps of: configuring a first bandwidth part and a second bandwidth part for a terminal; configuring a reserved resource for the first bandwidth part in a resource area in which the first bandwidth part and the second bandwidth part overlap; and performing an operation of transmitting or receiving a second data channel, which is scheduled to the second bandwidth part, together with the terminal by using the reserved resource. Therefore, the performance of the communication system can be improved.

Abstract: A method by which a terminal operating in an unlicensed band transmits a signal includes the steps of: receiving, from a base station, configuration information about a carrier; receiving configuration information for configuring N (where N is an integer) guard band(s) for some frequency domains of the carrier; and transmitting a signal to the base station by using a first frequency domain of a bandwidth part belonging to the carrier, wherein the first frequency domain can be a domain excluding the N guard band(s) from the frequency domain of the bandwidth part.

Abstract: A method and a device for supporting multicast transmission are disclosed. A terminal operating method comprises the steps of: receiving, from a base station, an RRC message indicating the activation of HARQ-ACK feedback; receiving, from the base station, a first DCI including information indicating deactivation of the HARQ-ACK feedback; receiving, from the base station, a first multicast PDSCH on the basis of first scheduling information included in the first DCI; generating a first HARQ-ACK bit for the first multicast PDSCH even if the first DCI indicates deactivation of the HARQ-ACK feedback; generating a HARQ codebook including the first HARQ-ACK bit; and transmitting, to the base station, the HARQ codebook through an uplink channel.

Abstract: An operation method of a terminal in a communication system may comprise: receiving one or more data units from a base station; generating a HARQ codebook for at least one dada unit of the one or more data units at a reference time; and transmitting the HARQ codebook to the base station, wherein the reference time is shared by the terminal and the base station.

Abstract: Disclosed are a method and an apparatus for transmitting or receiving uplink feedback information in a communication system. An operation method of a terminal may comprise receiving downlink control information (DCI) from a base station, the DCI including resource allocation information of a physical downlink shared channel (PDSCH); receiving data #n from the base station through the PDSCH indicated by the DCI; generating a hybrid automatic repeat request (HARQ) codebook including an HARQ response bit #n for the data #n and an HARQ response bit #n?1 for data #n?1 received from the base station before the data #n; and transmitting the HARQ codebook to the base station. Therefore, the performance of the communication system can be improved.

Abstract: Disclosed are methods and apparatuses for supporting BWP-based operations in sidelink communication. An operation method of a first terminal in a communication system may include receiving, from a base station, configuration information of a mapping relationship between an uplink (UL) bandwidth part (BWP) and a sidelink (SL) BWP; when a UL switching operation for the UL BWP is performed, performing an SL switching operation for the SL BWP mapped to the UL BWP based on the mapping relationship without separate signaling indicating execution of the SL switching operation; and performing sidelink communication with a second terminal in a switched SL BWP.

Abstract: A method for operation of a terminal for monitoring a downlink control channel comprises the steps of: receiving configuration information of a first SSSG and a second SSSG from a base station; monitoring the first SSSG in a first period; and monitoring the second SSSG in a second period. DCI including an indication for switching a target to be monitored from the first SSSG to the second SSSG in a period before the second period may be received from the base station.

Abstract: A method for receiving a PDCCH by a terminal in a mobile communication system may comprise the steps of: receiving a first PDCCH including first DCI from a base station through a first PDCCH search space; and receiving a second PDCCH including second DCI from the base station through a second PDCCH search space, wherein the first DCI and second DCI are for scheduling the same PDSCH for the same TB or TBs associated with the same HARQ process, are for scheduling different PDSCHs for the same TB or TBs associated with the same HARQ process, or are for scheduling different PDSCHs for different TBs or TBs associated with different HARQ processes. In addition, the first DCI and second DCI may be received from the base station within a time window.

Abstract: Feedback methods for repetitive uplink transmissions in a communication system are disclosed. An operation method of a terminal may comprise receiving DL data #1 from a base station through a DL data channel #1; receiving DL data #2 from the base station through a DL data channel #2; and when each of a UL control channel #1 on which an HARQ response #1 for the DL data #1 is to be transmitted and a UL control channel #2 on which an HARQ response #2 for the DL data #2 is to be transmitted overlaps with a UL data channel assigned by the base station, transmitting the HARQ response #1 and the HARQ response #2 to the base station through the UL data channel. Therefore, the performance of the communication system can be improved.

Abstract: A method of a first terminal supporting a first radio access technology (RAT) and a second RAT may comprise: determining candidate resources by performing a resource sensing operation based on the first RAT; performing a resource selection operation based on the first RAT with respect to the candidate resources in consideration of information on resources of the second RAT; and performing sidelink (SL) communication based on the first RAT with a second terminal using resources selected by the resource selection operation based on the first RAT.

Abstract: Disclosed is a method for configuring a bandwidth for supporting a broadband carrier in a communication system. An operation method of a base station comprises the steps of: configuring a first bandwidth part and a second bandwidth part for a terminal; configuring a reserved resource for the first bandwidth part in a resource area in which the first bandwidth part and the second bandwidth part overlap; and performing an operation of transmitting or receiving a second data channel, which is scheduled to the second bandwidth part, together with the terminal by using the reserved resource. Therefore, the performance of the communication system can be improved.

Abstract: A method of a terminal may comprise: receiving, from a base station, first unified transmission configuration indicator (TCI) information including a first TCI and a second TCI; receiving, from the base station, first downlink control information (DCI) including first scheduling information of a first physical downlink shared channel (PDSCH) and information indicating at least one TCI among the first TCI and the second TCI belonging to the first unified TCI information; and performing a first reception operation for the first PDSCH based on the at least one TCI and the first scheduling information.

Abstract: Disclosed are a method and an apparatus for uplink transmission in a communication system. An operation method of a terminal includes: receiving, from a base station, first SFI information indicating n flexible symbol(s); receiving, from the base station, second SFI information re-indicating m symbol(s) of the n flexible symbol(s) as uplink (UL) symbol(s); and transmitting an SRS to the base station through the m symbol(s) re-indicated as a UL symbol among the n flexible symbol(s) indicated as a flexible symbol. Therefore, performance of the communication system can be improved.

Abstract: An operation method of a terminal in a communication system may comprise: receiving one or more data units from a base station; generating a HARQ codebook for at least one dada unit of the one or more data units at a reference time; and transmitting the HARQ codebook to the base station, wherein the reference time is shared by the terminal and the base station.