Abstract: A connection block facilitates connection between circular pipes with excellent fracture withstand pressure and has flow holes to allow fluid movement between pipes, a header connector connecting the connection block to a header pipe, and a condenser including of the same and a plurality of connection tubes in a plurality of rows. The connection block includes a first surface, a second surface spaced apart from the first surface, a pair of curved portions connecting ends of the first surface and ends of the second surface, and a plurality of flow holes penetrating through the curved portions, wherein the pair of curved portions have the same curvature in cross section, perpendicular to a longitudinal direction.

Abstract: A method of a terminal may comprise: acquiring, from a non-terrestrial network (NTN) base station, system information (SI) including information indicating either a (quasi-) Earth-fixed cell or an Earth-moving cell (EMC); in response to the SI indicating an EMC, calculating a first distance between a location of the terminal and a reference location; and determining whether to perform measurement for cell reselection based on a comparison result between the first distance and a threshold distance included in the SI and ephemeris information of a satellite included in the SI.

Abstract: Disclosed are a method and a device for transmission or reception of an integrated access backhaul node. An operation method of a first IAB node comprises the steps of: receiving information of a power offset from a second IAB node; deriving a first EPRE of a PDSCH transmitted by the second IAB node on the basis of the power offset; transmitting, to the second IAB node, a first message requesting adjustment of transmission power of the PDSCH; receiving, from the second IAB node, a second message including information on the adjusted transmission power of the PDSCH; and applying the adjusted transmission power to the first EPRE, so as to derive the adjusted EPRE of the PDSCH.

Abstract: An operation method of a repeater relaying wireless communications between a base station and at least one terminal in a communication system may include: transmitting, to the base station, a first capability report including information on beam-related capability supported by the repeater; transmitting, to the base station, a first request signal for requesting to perform first configuration for coverage extension of the repeater; receiving, from the base station, information on the first configuration configured based on the first capability report and the first request signal; and relaying the wireless communications between the base station and the at least one terminal based on one or more beams formed based on the received first configuration.

Abstract: A resource management method carried out by an integrated access and backhaul (IAB) node in a communication system, according to one embodiment of the present invention, may comprise the steps of: receiving, from an upper-level node of an IAB node, a first upper layer signaling signal for resource configuration of the IAB node; receiving, from the upper-level node of the IAB node, a second upper layer signaling signal for resource configuration of the IAB node; and, on the basis of the first and second upper layer signaling signals, determining that an IAB-mobile terminal (IAB-MT) and an IAB-distributed unit (IAB-DU) constituting the IAB node carry out communication by being multiplexed by any one scheme among time division, frequency division and spatial division.

Abstract: An operation method of a repeater relaying wireless communications between a base station and at least one terminal in a communication system may include: transmitting, to the base station, a first capability report including information on beam-related capability supported by the repeater; transmitting, to the base station, a first request signal for requesting to perform first configuration for coverage extension of the repeater; receiving, from the base station, information on the first configuration configured based on the first capability report and the first request signal; and relaying the wireless communications between the base station and the at least one terminal based on one or more beams formed based on the received first configuration.

Abstract: Disclosed are a method and device for communication using a fronthaul interface. According to the present invention, an operation method of an O-RU comprises the steps of: generating a plurality of first measurement results by performing measurement operations on a first measurement target in a single notification period according to a notification interval; generating a first measurement result list including the plurality of first measurement results; and transmitting, to an a message including the first measurement result list.

Abstract: A timing control method, performed by a first DU including a processor and a modem in a base station supporting function-splitting, includes obtaining, by the processor, first time information from a CU included in the base station; obtaining, by the processor, synchronization information with a first system based on the first time information; identifying, by the processor, a change time point of an SFN based on the synchronization information; generating, by the processor, a first timing control signal including a signal indicating a changed SFN and a first tick signal having a same periodicity as a change periodicity of the SFN when the SFN is changed; and providing, by the processor, the first timing control signal to the modem.

Abstract: Disclosed are a method and an apparatus for communication using fronthaul interfaces. An operation method of a first communication node may include transmitting a section type 8 message #1 including numerology-related information #1; transmitting a section type 9 message #1 including channel information of each of one or more second communication nodes indicated by the section type 8 message #1 and the numerology related information #1, transmitting a section type 8 message #2 including numerology-related information #2 other than the numerology-related information #1; and transmitting a section type 9 message #2 including channel information of each of one or more third communication nodes indicated by the section type 8 message #2 and the numerology-related information #2.

Abstract: An operation method of a first device may comprise: receiving, from a second device, first configuration information signaled for CLI-related procedures; receiving, from the second device, second configuration information signaled for operating a multiplexing operation of the first device; in response to recognizing, with respect to a first resource, a collision between first DL-UL configuration information indicated by the first configuration information and second DL-UL configuration information indicated by the second configuration information, comparing priorities of the first DL-UL configuration information and the second DL-UL configuration information; and determining a DL-UL configuration applied to the first resource based on the compared priorities.

Abstract: Disclosed are a method and an apparatus for communication using fronthaul interfaces. An operation method of a first communication node includes transmitting a section type 8 message #1 including numerology-related information #1; transmitting a section type 9 message #1 including channel information of each of one or more second communication nodes indicated by the section type 8 message #1 and the numerology related information #1, transmitting a section type 8 message #2 including numerology-related information #2 other than the numerology-related information #1; and transmitting a section type 9 message #2 including channel information of each of one or more third communication nodes indicated by the section type 8 message #2 and the numerology-related information #2.

Abstract: An operation method of a first device may comprise: identifying a first MT CC operating in a multiplexing mode among one or more MT CCs formed by an IAB-MT constituting the first device; determining first beam preference information for the first MT CC; transmitting, to a second device which is an upper node of the first device, the first beam preference information; and performing beam-based communications with the second device based on the first beam preference information.

Abstract: A baseband signal generation method includes mapping frequency-domain data for a plurality of component carriers to subcarrier resources; performing a frequency shift on the frequency domain-data allocated to the subcarrier resources; generating a time-domain signal by performing IFFT on the frequency-shifted frequency-domain data using a single IFFT block; and generating a time-domain baseband signal by adding a CP to the time-domain signal.

Abstract: An operation method of a repeater performing relaying between a base station and a first terminal in a communication system may comprise: receiving one or more signals from at least one of the base station and the first terminal; performing monitoring on the one or more signals in a time interval for which a transmission direction is not determined by the base station; and determining the transmission direction of the time interval based on a result of the monitoring, wherein the one or more signals include at least one of a first signal received from the base station or a second signal received from the first terminal.

Abstract: A DC management method, performed by a first communication node constituting an IAB network in a communication system, may comprise: receiving, from a first IAB node that is a lower node of the first communication node, a first capability report including information of DC-related capability of the first IAB node; based on the first capability report, identifying whether the first IAB node supports a multi-TRP function; based on the first capability report, identifying whether the first IAB node supports an intra-carrier DC; and based on the identified whether the first IAB node supports the multi-TRP function and whether the first IAB node supports the intra-carrier DC, configuring a DC for the first IAB node together with a second communication node that is an upper node of the first IAB node.

Abstract: An operation method of a repeater relaying wireless communications between a base station and at least one terminal in a communication system may include: transmitting, to the base station, a first capability report including information on beam-related capability supported by the repeater; transmitting, to the base station, a first request signal for requesting to perform first configuration for coverage extension of the repeater; receiving, from the base station, information on the first configuration configured based on the first capability report and the first request signal; and relaying the wireless communications between the base station and the at least one terminal based on one or more beams formed based on the received first configuration.

Abstract: A baseband signal generation method includes mapping frequency-domain data for a plurality of component carriers to subcarrier resources; performing a frequency shift on the frequency domain-data allocated to the subcarrier resources; generating a time-domain signal by performing IFFT on the frequency-shifted frequency-domain data using a single IFFT block; and generating a time-domain baseband signal by adding a CP to the time-domain signal.

Abstract: A timing control method, performed by a first DU including a processor and a modem in a base station supporting function-splitting, includes obtaining, by the processor, first time information from a CU included in the base station; obtaining, by the processor, synchronization information with a first system based on the first time information; identifying, by the processor, a change time point of an SFN based on the synchronization information; generating, by the processor, a first timing control signal including a signal indicating a changed SFN and a first tick signal having a same periodicity as a change periodicity of the SFN when the SFN is changed; and providing, by the processor, the first timing control signal to the modem.

Abstract: Disclosed are a method and an apparatus for communication using fronthaul interfaces. An operation method of a first communication node includes transmitting a section type 8 message #1 including numerology-related information #1; transmitting a section type 9 message #1 including channel information of each of one or more second communication nodes indicated by the section type 8 message #1 and the numerology related information #1, transmitting a section type 8 message #2 including numerology-related information #2 other than the numerology-related information #1; and transmitting a section type 9 message #2 including channel information of each of one or more third communication nodes indicated by the section type 8 message #2 and the numerology-related information #2.

Abstract: The present invention relates to a method for generating a downlink frame including generating a first short sequence and a second short sequence indicating cell group information, generating a first scrambling sequence determined by the first synchronization signal, generating a second scrambling sequence determined by the first short sequence, scrambling the first short sequence with the first scrambling sequence, scrambling the second short sequence with at least the second scrambling sequence, and mapping a second synchronization signal including the scrambled first short sequence and the scrambled second short sequence in the frequency domain.