Abstract: A method for transmitting a measurement report by a wireless node in a wireless communication system is disclosed. The method comprises measuring a channel for obtaining channel congestion information; and transmitting the measurement report including the channel congestion information to the network, wherein the channel congestion information is determined based on a number of times a busy period appears and a number of busy samples, within a reporting interval.

Abstract: A method for transmitting signals by a user equipment (UE) in a wireless communication system is disclosed. The method comprises skipping buffer status report (BSR) triggering procedure when a logical channel belongs to a specific logical channel group; receiving an uplink grant allowed to be used for transmission of buffer size information of the specific logical channel group; and transmitting buffer size information of the specific logical channel group based on the uplink grant.

Abstract: A method for calculating a channel busy level (CBL) by a user equipment in a wireless communication system is disclosed. The method comprises monitoring a plurality of synchronization signal/physical broadcast channel (SS/PBCH) blocks within a predetermined window; calculating the CBL by counting dropped SS/PBCH blocks among the plurality of SSBs; configuring parameters for a specific procedure based on the calculated CBL; and performing the specific procedure by using the configured parameters.

Abstract: Provided is a method for selectively performing an uplink scheduling request (SR) by a terminal on the basis of an adaptive uplink channel state threshold value, and an apparatus supporting the same. The terminal may calculate an uplink channel state threshold value on the basis of a variation of a short-term average uplink channel state and a long-term average uplink channel state, determine an uplink channel state predictive value on the basis of a downlink channel state, and determine whether to perform an uplink scheduling request on the basis of the uplink channel state predictive value and the uplink channel state threshold value.

Abstract: A method for performing a random access (RA) procedure by a user equipment (UE) in a wireless communication system is provided. The method comprises: selecting a uplink carrier for the RA procedure between a first uplink carrier for a serving cell and a second uplink carrier for the serving cell; and performing a first random access preamble (RAP) transmission for the RA procedure through the selected uplink carrier. Selecting the uplink carrier comprises: selecting the first uplink carrier when a downlink signal quality of the serving cell is less than a first threshold, and selecting one of the first and second uplink carriers randomly when the downlink signal quality of the serving cell is equal to or above the first threshold.

Abstract: A method for transmitting data through a logical channel by a user equipment (UE) in a wireless communication system is disclosed. The method comprises determining whether data for the logical channel exists or not; increasing a token value based on a prioritized Bit Rate (PBR) and a time elapsed since the data becomes available for the logical channel, when the data for the logical channel exists; and transmitting the data or a part of the data through the logical channel, when the token value is greater than 0, wherein when there is no data for the logical channel, the token value is not increased.

Abstract: Provided are a method by which a terminal selectively performs an operation on the basis of a terminal operation mode in a wireless communication system, and a device for supporting the method. The terminal determines a terminal group to which the terminal belongs, on the basis of a battery residual quantity and a battery residual quantity threshold value, calculates channel quality on the basis of a downlink reference signal, determines a terminal operation mode on the basis of the determined terminal group, the calculated channel quality, and the channel quality threshold value, and performs an operation on the basis of the determined terminal operation mode, wherein the terminal group can be any one of an energy insufficient group (EIG) and an energy sufficient group (ESG).

Abstract: The present specification suggests a method for establishing a terminal-centric group cell on the basis of measurement signal variation for cooperative transmission and handover in a mobile communication system. Specifically, a base station receives transmissions of parameters from a terminal, configures a terminal surrounding cell information table, and configures a cooperative cell cluster configuration table using the terminal surrounding cell information table as the terminal moves. The base station performs cooperative transmission and handover using the cooperative cell cluster configuration table. The terminal sends parameters to the base station periodically or when a certain condition is met, and the base station updates the terminal surrounding cell information table and the cooperative cell cluster configuration table using the parameters sent from the terminal to thereby use the same for mobility management.

Abstract: Provided is a method for selectively performing an uplink scheduling request (SR) by a terminal on the basis of an adaptive uplink channel state threshold value, and an apparatus supporting the same. The terminal may calculate an uplink channel state threshold value on the basis of a variation of a short-term average uplink channel state and a long-term average uplink channel state, determine an uplink channel state predictive value on the basis of a downlink channel state, and determine whether to perform an uplink scheduling request on the basis of the uplink channel state predictive value and the uplink channel state threshold value.

Abstract: Provided are a method by which a terminal selectively performs an operation on the basis of a terminal operation mode in a wireless communication system, and a device for supporting the method. The terminal determines a terminal group to which the terminal belongs, on the basis of a battery residual quantity and a battery residual quantity threshold value, calculates channel quality on the basis of a downlink reference signal, determines a terminal operation mode on the basis of the determined terminal group, the calculated channel quality, and the channel quality threshold value, and performs an operation on the basis of the determined terminal operation mode, wherein the terminal group can be any one of an energy insufficient group (EIG) and an energy sufficient group (ESG).

Abstract: The present specification suggests a method and an apparatus for more efficient mobility management through a hierarchical structure of a micro mobility management entity (MME) and a macro MME in a mobile communication system. Particularly, a second MME establishes a connection with a plurality of small cells included in a single macro cell. The second MME manages a single particular macro cell, and a first MME manages a plurality of macro cells, thereby providing a hierarchical structure. Additionally, the second MME transmits a paging message to a small cell in which a terminal is positioned, among the plurality of small cells included in a single macro cell. The second MME has information on the position of the terminal and can transmit the paging message to a particular small cell in which the terminal is positioned.

Abstract: The present specification suggests a method for improving performance degradation caused by frequent handovers when a terminal moves among several cells, particularly among dense small cells. To this end, required are cooperative transmission among cells and a new handover method. A base station receives RSRP information about an anchor cell and a neighboring cell and configures a cooperation-based cell cluster using the RSRP information. If RSRP values are compared and meet specific conditions, the anchor cell and the neighboring cell carry out cooperative communication. If the RSRP values of the anchor cell and an anchor candidate cell are compared during the cooperative communication and meet specific conditions, handover from the anchor cell to the anchor candidate cell is carried out. If the present invention is applied, when the terminal moves in an environment where small cells are dense, the number of handovers is greatly reduced and thus network burden can be lessened.

Abstract: The present specification suggests a method for establishing a terminal-centric group cell on the basis of measurement signal variation for cooperative transmission and handover in a mobile communication system. Specifically, a base station receives transmissions of parameters from a terminal, configures a terminal surrounding cell information table, and configures a cooperative cell cluster configuration table using the terminal surrounding cell information table as the terminal moves. The base station performs cooperative transmission and handover using the cooperative cell cluster configuration table. The terminal sends parameters to the base station periodically or when a certain condition is met, and the base station updates the terminal surrounding cell information table and the cooperative cell cluster configuration table using the parameters sent from the terminal to thereby use the same for mobility management.

Abstract: The present specification suggests a method and an apparatus for more efficient mobility management through a hierarchical structure of a micro mobility management entity (MME) and a macro MME in a mobile communication system. Particularly, a second MME establishes a connection with a plurality of small cells included in a single macro cell. The second MME manages a single particular macro cell, and a first MME manages a plurality of macro cells, thereby providing a hierarchical structure. Additionally, the second MME transmits a paging message to a small cell in which a terminal is positioned, among the plurality of small cells included in a single macro cell. The second MME has information on the position of the terminal and can transmit the paging message to a particular small cell in which the terminal is positioned.

Abstract: The present specification suggests a method for improving performance degradation caused by frequent handovers when a terminal moves among several cells, particularly among dense small cells. To this end, required are cooperative transmission among cells and a new handover method. A base station receives RSRP information about an anchor cell and a neighboring cell and configures a cooperation-based cell cluster using the RSRP information. If RSRP values are compared and meet specific conditions, the anchor cell and the neighboring cell carry out cooperative communication. If the RSRP values of the anchor cell and an anchor candidate cell are compared during the cooperative communication and meet specific conditions, handover from the anchor cell to the anchor candidate cell is carried out. If the present invention is applied, when the terminal moves in an environment where small cells are dense, the number of handovers is greatly reduced and thus network burden can be lessened.