Abstract: A method of providing a multicast service is provided by a terminal in a terminal-to-terminal direct communication. The terminal transmits a service start request message requesting a start of a multicast service to a multicast server, and receives a service start response message including a result of permitting a start request from the multicast server. The terminal receives, via a base station, resource information of a resource which a multicast coordinator allocates to the multicast service in accordance with a request of the multicast server, and transmits multicast service data based on the resource information.

Abstract: Disclosed is a controller managing a base station in a heterogeneous network environment constituted by a macro base station and a small cell base station group, including: a traffic managing unit managing traffic of the small cell base station group; and an operation controlling unit controlling an operation of at least one peripheral base station included in the small cell base station group based on the traffic of the small cell base station group, wherein the small cell base station group includes a center base station and the at least one peripheral base station and the small cell base station group is disposed in a macro cell configured by the macro base station.

Abstract: A base station of a carrier aggregation system performs interference control of a first component carrier in which interference exceeds a threshold value among a plurality of component carriers based on an ABS pattern and changes the first component carrier to an available new component carrier, when interference of the first component carrier exceeds a threshold value after the interference control is performed.

Abstract: A cross carrier scheduling method is provided by a terminal. The terminal receives a control element including cross carrier scheduling configuration information from a base station, and sets a scheduling cell of a secondary cell in accordance with the cross carrier scheduling configuration information. The terminal starts to monitor scheduling information of the secondary cell at the scheduling cell from a time predefined between the base station and the terminal.

Abstract: According to an exemplary embodiment of the present invention, a master base station selects a target serving cell in which a state is changed, among the serving cells of at least one slave base station set in the terminal, generates a MAC control element which instructs a state change of the target serving cell, and then directly transmits the MAC control element to the terminal in the case of an uplink asynchronous state between the target slave base station managing the target serving cell and the terminal.

Abstract: A method in which a base station manages information for D2D communication, which is direct communication between terminals, is provided. The base station receives a first message that requests a configuration of a first open discovery service that searches for a first terminal and at least one terminal to perform D2D communication. The base station determines whether a resource to allocate to the first terminal exists. The base station stores first information for providing the first open discovery service based on the determination result.

Abstract: Disclosed is a controller managing a base station in a heterogeneous network environment constituted by a macro base station and a small cell base station group, including: a traffic managing unit managing traffic of the small cell base station group; and an operation controlling unit controlling an operation of at least one peripheral base station included in the small cell base station group based on the traffic of the small cell base station group, wherein the small cell base station group includes a center base station and the at least one peripheral base station and the small cell base station group is disposed in a macro cell configured by the macro base station.

Abstract: Disclosed are a method for allocating a resource to a D2D link of a base station, including determining a D2D link resource to be allocated to the D2D link among cellular resources of the base station, and transmitting uplink control information including information on the D2D link resource to at least two terminals which are connected by the D2D link among a plurality of cellular terminals connected to the base station, and a method for transmitting/receiving data to and from a terminal, including: searching for a white space of cellular resources; transmitting a search result for the white space to a base station of coverage to which the terminal belongs; receiving resource information determined depending on the search result; and transmitting/receiving data to and from the adjacent terminals through the D2D link based on the resource information.

Abstract: When receiving a detachment notification message informing of detachment of a first D2D device, a D2D server in a device-to-device (D2D) communication system performs a D2D communication release procedure of an opponent D2D device which is communicating with the first D2D device, and deletes information for the D2D communication of the opponent D2D device.

Abstract: A method of providing a multicast service is provided by a terminal in a terminal-to-terminal direct communication. The terminal transmits a service start request message requesting a start of a multicast service to a multicast server, and receives a service start response message including a result of permitting a start request from the multicast server. The terminal receives, via a base station, resource information of a resource which a multicast coordinator allocates to the multicast service in accordance with a request of the multicast server, and transmits multicast service data based on the resource information.

Abstract: A second terminal which performs direct communication with a first terminal receives a signal for measuring a radio channel from the first terminal and calculates radio channel quality. Further, the second terminal calculates a data error rate using replay information indicating whether data are received and compensates for the radio channel quality depending on a data error rate. The second terminal reports the compensated radio channel quality to a base station and the base station uses the compensated radio channel quality to allocate resources used in direct communication.

Abstract: Disclosed are a method and an apparatus for managing a resource in a small cell environment. The method for managing a resource in a small cell environment by a macro base station for controlling connection between user equipment (UE) and a gateway (GW), includes: configuring at least one packet path between the GW and the UE through a bearer of the macro base station; determining whether to add at least one small base station in the macro base station to the at least one packet path according to signal strength of the at least one small base station from the UE; and changing the at least one packet path using a bearer of a small base station based on the result.

Abstract: The present invention relates to a wireless communication system that supports the mobility management in a small cell environment, the wireless communication system includes a user equipment configured to measure a signal strength of multiple small cells around and transmit the measurement result through a serving cell, and a multiple small base stations configured to store user equipment context information in determined preparation cells among the multiple small cells based on the measurement result, in case that the user equipment context information for cell A among the preparation cells is changed, wherein the multiple small base stations update the changed user equipment context information.

Abstract: A base station of a carrier aggregation system performs interference control of a first component carrier in which interference exceeds a threshold value among a plurality of component carriers based on an ABS pattern and changes the first component carrier to an available new component carrier, when interference of the first component carrier exceeds a threshold value after the interference control is performed.

Abstract: A base station of a carrier aggregation system sets a time division duplex (TDD) component carrier of a plurality of TDD component carriers to a primary serving cell of a terminal and sets at least one frequency division duplex (FDD) component carrier of a plurality of FDD component carriers to a secondary serving cell of the terminal, and when a hybrid automatic repeat request-round trip time (HARQ RTT) value of a TDD component carrier of a primary serving cell of the terminal does not satisfy a quality of service (QoS) requirement of a service that the terminal requests, the base station changes a HARQ feedback transmitting resource that is set to the terminal.

Abstract: An exemplary embodiment of the present invention provides a method for managing, by a management system, an enterprise zone. The management system constructs information on a plurality of small cell base stations and at least one terminal. The management system allocates at least one closed subscriber group (CSG) ID to the enterprise zone including cells of the small cell base stations. Further, the management system transmits a message for adding the CSG ID to a whitelist of the terminal to the terminal.

Abstract: A method in which a base station manages information for D2D communication, which is direct communication between terminals, is provided. The base station receives a first message that requests a configuration of a first open discovery service that searches for a first terminal and at least one terminal to perform D2D communication. The base station determines whether a resource to allocate to the first terminal exists. The base station stores first information for providing the first open discovery service based on the determination result.

Abstract: An apparatus for allocating resources of a cell allocates some of the entire frequency band for a D2D link in the entire zone of the cell, allocates the rest of the entire frequency band for a cellular link in at least some zone of the cell, and allocates time resources different from those of D2D links of adjacent cells to the D2D link.

Abstract: According to an exemplary embodiment of the present invention, a master base station selects a target serving cell in which a state is changed, among the serving cells of at least one slave base station set in the terminal, generates a MAC control element which instructs a state change of the target serving cell, and then directly transmits the MAC control element to the terminal in the case of an uplink asynchronous state between the target slave base station managing the target serving cell and the terminal.

Abstract: A cross carrier scheduling method is provided by a terminal. The terminal receives a control element including cross carrier scheduling configuration information from a base station, and sets a scheduling cell of a secondary cell in accordance with the cross carrier scheduling configuration information. The terminal starts to monitor scheduling information of the secondary cell at the scheduling cell from a time predefined between the base station and the terminal.