Abstract: An embodiment of the present specification provides a method for preparing a catalyst for preparing a carbon nanotube, comprising: (a) dissolving a main catalyst precursor, a support precursor, a cocatalyst precursor and a precipitation inhibitor in a solvent to prepare a precursor solution; and (b) pyrolyzing the precursor solution by spraying the precursor solution into a reactor, wherein a mole fraction of the precipitation inhibitor to the cocatalyst precursor is 0.1 to 1.5.

Abstract: The method performed by a base station of the wireless communication system according to the embodiments of this invention may comprise the following steps: the step to transmit a codebook allocated to each of multiple user terminals for the data transmission; the step to receive the pilot and the data from one or more user terminals among the above-mentioned multiple user terminals; the step to generate the active user information based on the above-mentioned data; the step to detect the active user terminal among the above-mentioned multiple user terminals based on above-mentioned pilot and active user information; the step to generate the channel estimation information related to the above-mentioned active user terminal; and the step to detect the data of the above-mentioned active user terminal based on the above-mentioned channel estimation information.

Abstract: The present disclosure relates to a pre-5th-Generation (5G) or 5G communication system to be provided for supporting higher data rates Beyond 4th-Generation (4G) communication system such as Long Term Evolution (LTE). An apparatus of a base station of a first operator in a wireless communication system includes: at least one transceiver; and at least one processor operatively coupled with the at least one transceiver, and the at least one processor is configured to transmit a first signal during a first slot regarding the first operator in a contention duration, and to determine occupancy of a band in an access duration, based on a priority of the first operator, and the priority is determined according to at least one second signal which is detected before the first slot in the contention duration.

Abstract: The disclosure relates to a communication technique of combining a 5G communication system to support a higher data transfer rate than in a 4G system with IoT technology, and a system thereof. The disclosure provides a terminal in a wireless communication system. The terminal includes at least one processor configured to: obtain a codebook set for the terminal; generate uplink signals by using a plurality of codebooks of the codebook set; and control at least one transceiver to transmit the uplink signals to a base station. A first uplink signal of a first resource among the uplink signals is generated based on a codeword of a first codebook among codebooks and a second uplink signal of a second resource adjacent to the first resource among the uplink signals is generated based on a codeword of a second codebook which is different from the first codebook among codebooks.

Abstract: The disclosure relates to a communication technique of combining a 5G communication system to support a higher data transfer rate than in a 4G system with IoT technology, and a system thereof. The disclosure provides a terminal in a wireless communication system. The terminal includes at least one processor configured to: obtain a codebook set for the terminal; generate uplink signals by using a plurality of codebooks of the codebook set; and control at least one transceiver to transmit the uplink signals to a base station. A first uplink signal of a first resource among the uplink signals is generated based on a codeword of a first codebook among codebooks and a second uplink signal of a second resource adjacent to the first resource among the uplink signals is generated based on a codeword of a second codebook which is different from the first codebook among codebooks.

Abstract: The present disclosure relates to a pre-5th-Generation (5G) or 5G communication system to be provided for supporting higher data rates Beyond 4th-Generation (4G) communication system such as Long Term Evolution (LTE). According to various embodiments of the present disclosure, an apparatus of a base station of a first operator in a wireless communication system includes: at least one transceiver; and at least one processor operatively coupled with the at least one transceiver, and the at least one processor is configured to transmit a first signal during a first slot regarding the first operator in a contention duration, and to determine occupancy of a band in an access duration, based on a priority of the first operator, and the priority is determined according to at least one second signal which is detected before the first slot in the contention duration.

Abstract: The present disclosure relates to a pre-5th-Generation (5G) or 5G communication system to be provided for supporting higher data rates Beyond 4th-Generation (4G) communication system such as Long Term Evolution (LTE). A base station apparatus according to various embodiments may comprise: a communication unit configured to transmit or receive information; and a control unit coupled to the communication unit, wherein the control unit may be configured to receive, from at least one other base station that shares a frequency band, first information associated with one or more of a second base station and a second terminal included in a second system that shares the frequency band, determine a transmission start alignment interval on the basis of the received first information, and transmit information on the transmission start alignment interval to the at least one other base station.

Abstract: The present disclosure relates to a pre-5th-Generation (5G) or 5G communication system for supporting higher data rates beyond 4th-Generation (4G) communication system such as long term evolution (LTE). According to various embodiments in the present disclosure, a method of operating a terminal in a wireless communication system comprises receiving information for indicating a pre-listen interval within an allocated channel occupancy time from a base station (BS), transmitting a reporting signal for indicating that occupancy of an unlicensed band by at least one node is not detected during the pre-listen interval, receiving resource allocation information for indicating uplink resources of the unlicensed band allocated based on the reporting signal, and transmitting uplink data through the uplink resources.

Abstract: The disclosure relates to a pre-5th-Generation (5G) or 5G communication system to be provided for supporting higher data rates Beyond 4th-Generation (4G) communication system such as Long Term Evolution (LTE). a method for operating a terminal in a wireless communication system is provided. The method includes receiving information relating to a data session from a network node, determining a target node among nodes belonging to a second network based on the information relating to the data session, and performing a handover from a source node belonging to a first network to the target node.

Abstract: Disclosed are an apparatus and a method for simultaneously multiplexing and transmitting a broadband traffic and a machine-to-machine traffic or an ultra-reliable low latency communication traffic using the same resource. That is, according to the present invention, it is possible to enhance efficiency of resources when an eMBB traffic and an mMTC traffic or an uRLLC traffic are multiplexed, by spreading and transmitting intermittent data generated in an MTC terminal with superimposition on a subcarrier resource allocated to an eMBB terminal without reservation on a time axis while sharing a high-speed data resource in an OFDMA system and transmitting an uRLCC terminal requiring a short transmission latency time with superimposition on one symbol on a frequency axis.

Abstract: Disclosed are a method and an apparatus for detecting real-time random access and multi-user using multiple sequence spreading. The method for detecting real-time random access and multi-user using multiple sequence spreading may include steps of selecting, by user equipment, one spreading sequence set from a plurality of spreading sequence sets randomly without a separate resource allocation and/or spreading sequence allocation, applying, by the user equipment, each of the plurality of spreading sequences included in the one spreading sequence set to each of the plurality of symbols included in a group, and transmitting, by the user equipment, each of the plurality of symbols spread based on each of the plurality of spreading sequences.

Abstract: The present disclosure relates to a pre-5th-generation (5G) or 5G communication system to be provided for supporting higher data rates beyond 4th-generation (4G) communication system such as long term evolution (LTE). An apparatus of a base station in a wireless communication system is provided. The apparatus includes at least one processor configured to determine a length of a channel occupancy period and a length of a contention period with respect to a band shared with other system, and a transceiver configured to, when detecting no signal of the other system until a time indicated by a back-off value in the contention period, transmit a signal over the band. A method of a base station in a wireless communication system is provided.

Abstract: Provided are FTN-based OFDM transmission apparatus and method for efficient coexistence of broadband and sporadic traffics which may share radio resources with a Nyquist rate or more of efficiency by inserting the sporadic traffic into resources allocated to the broadband traffic in uplink transmission of a mobile communication system and use the band multiplexing even to a multi input multi output (MIMO) transmission apparatus. According to the present invention, it is possible to reduce quality deterioration according to actual offloading of subcarriers by removing some frequency components to remove a frequency domain allocated with some subcarriers among frequency components of the broadband traffic to selectively offload subcarriers having low contribution rate for the actual broadband transmission and to use the sporadic traffic in a grant-free access scheme by using bands used for the offloaded subcarriers in the sporadic traffic transmission.

Abstract: Disclosed are an apparatus and a method for simultaneously multiplexing and transmitting a broadband traffic and a machine-to-machine traffic or an ultra-reliable low latency communication traffic using the same resource. That is, according to the present invention, it is possible to enhance efficiency of resources when an eMBB traffic and an mMTC traffic or an uRLLC traffic are multiplexed, by spreading and transmitting intermittent data generated in an MTC terminal with superimposition on a subcarrier resource allocated to an eMBB terminal without reservation on a time axis while sharing a high-speed data resource in an OFDMA system and transmitting an uRLCC terminal requiring a short transmission latency time with superimposition on one symbol on a frequency axis.

Abstract: Provided are FTN-based OFDM transmission apparatus and method for efficient coexistence of broadband and sporadic traffics which may share radio resources with a Nyquist rate or more of efficiency by inserting the sporadic traffic into resources allocated to the broadband traffic in uplink transmission of a mobile communication system and use the band multiplexing even to a multi input multi output (MIMO) transmission apparatus. According to the present invention, it is possible to reduce quality deterioration according to actual offloading of subcarriers by removing some frequency components to remove a frequency domain allocated with some subcarriers among frequency components of the broadband traffic to selectively offload subcarriers having low contribution rate for the actual broadband transmission and to use the sporadic traffic in a grant-free access scheme by using bands used for the offloaded subcarriers in the sporadic traffic transmission.

Abstract: The present disclosure relates to a pre-5th-Generation (5G) or 5G communication system to be provided for supporting higher data rates Beyond 4th-Generation (4G) communication system such as long term evolution (LTE). According to various embodiments of the present disclosure, an apparatus according to aspects of a communication system that shares a channel with another communication system may include at least one processor and at least one transceiver. The at least one processor may be configured to determine a transmission timing of an initial signal based on a parameter for the initial signal that indicates that the apparatus occupies a channel and at least one detection interval for detecting a signal of the another communication system. The at least one transceiver is configured to transmit the initial signal according to the transmission timing.

Abstract: The disclosure relates to a pre-5th-Generation (5G) or 5G communication system to be provided for supporting higher data rates Beyond 4th-Generation (4G) communication system such as Long Term Evolution (LTE). a method for operating a terminal in a wireless communication system is provided. The method includes receiving information relating to a data session from a network node, determining a target node among nodes belonging to a second network based on the information relating to the data session, and performing a handover from a source node belonging to a first network to the target node.

Abstract: Disclosed are a method and an apparatus for detecting real-time random access and multi-user using multiple sequence spreading. The method for detecting real-time random access and multi-user using multiple sequence spreading may include steps of selecting, by user equipment, one spreading sequence set from a plurality of spreading sequence sets randomly without a separate resource allocation and/or spreading sequence allocation, applying, by the user equipment, each of the plurality of spreading sequences included in the one spreading sequence set to each of the plurality of symbols included in a group, and transmitting, by the user equipment, each of the plurality of symbols spread based on each of the plurality of spreading sequences.

Abstract: The present disclosure relates to a pre-5th-Generation (5G) or 5G communication system for supporting higher data rates beyond 4th-Generation (4G) communication system such as long term evolution (LTE). According to various embodiments in the present disclosure, a method of operating a terminal in a wireless communication system comprises receiving information for indicating a pre-listen interval within an allocated channel occupancy time from a base station (BS), transmitting a reporting signal for indicating that occupancy of an unlicensed band by at least one node is not detected during the pre-listen interval, receiving resource allocation information for indicating uplink resources of the unlicensed band allocated based on the reporting signal, and transmitting uplink data through the uplink resources.

Abstract: The present disclosure relates to a pre-5th-Generation (5G) or 5G communication system to be provided for supporting higher data rates Beyond 4th-Generation (4G) communication system such as Long Term Evolution (LTE). A base station apparatus according to various embodiments may comprise: a communication unit configured to transmit or receive information; and a control unit coupled to the communication unit, wherein the control unit may be configured to receive, from at least one other base station that shares a frequency band, first information associated with one or more of a second base station and a second terminal included in a second system that shares the frequency band, determine a transmission start alignment interval on the basis of the received first information, and transmit information on the transmission start alignment interval to the at least one other base station.