Abstract: The present invention relates to a method and apparatus for controlling a generation of synchronization signal in a wireless communication system that supports a device to device communication. The method includes searching a first synchronization signal for the D2D communication; comparing a reception signal strength of the searched first synchronization signal with a threshold value; and determining whether to transmit a second synchronization signal of the first UE according to a specific condition when the reception signal strength is smaller than the threshold value.

Abstract: The present invention provides a method and a user device for receiving a downlink signal, and a method and a base station for transmitting a downlink signal. The method for a user device receiving the downlink signal in a wireless communication system, comprises: encoding downlink control channel candidates, each of which comprise at least one control channel element (CCE); and detecting the downlink control channel of the user device, wherein each of the downlink control channel candidates is encoded in accordance with a first downlink control information (DCI) format and a CCE type for the user device, or a second DCI format and a predetermined CCE type.

Abstract: Disclosed is a method by which a transmission terminal transmits a signal by using device-to-device direct communication in a wireless communication system. Particularly, the method comprises the steps of: identifying each of a plurality of resource units as a clean unit or a dirty unit; selecting one of the clean units as a transmission resource if the number of clean units is a first threshold value or more; selecting, as the transmission resource, one among the one or more dirty units from which interference that is a second critical value or more is detected if the number of clean units is less than the first threshold value; and transmitting a device-to-device direct communication signal by using the selected transmission resource.

Abstract: The present invention relates to a method and a device for transmitting a device-to-device (D2D) signal of a first terminal in a wireless communication system. Particularly, the method comprises the steps of: receiving at least one parameter for D2D communication which includes a scheduling assignment identity (ID); and transmitting a D2D signal generated by using the scheduling assignment ID to a second terminal through an uplink subframe, wherein the scheduling assignment ID is associated with the second terminal for the D2D communication.

Abstract: The present invention relates to a wireless communication system. In detail, provided are a method by which a terminal receives a control channel signal in a wireless communication system, and an apparatus for same, including the steps of: receiving a subframe including a plurality of control channel sets, wherein each control channel set includes a plurality of control channel candidates; and monitoring at least one control channel set in the subframe for receiving the control channel signal, wherein the plurality of control channel candidates are scrambled by a scrambling sequence having a control channel set-specific initialization value in each control channel set.

Abstract: The present invention relates to a method and apparatus for allocating D2D resources using relay UE in a wireless communication system supporting D2D communication. The method may include receiving D2D resource allocation information related to a first resource set used in a first cluster from the head UE of the first cluster and transmitting the received D2D resource allocation information to head UE of a second cluster. The D2D resource allocation information includes at least one of D2D resource set configuration information indicative of a configuration of D2D resource sets used in D2D communication, D2D resource set use information indicative of a D2D resource set which is now used, and D2D resource set indication information indicative of a D2D resource set to be used in a next cluster. The D2D resource set is allocated for each cluster.

Abstract: In the present application, a method for transmitting a signal using device-to-device direct communication by a transmission user equipment in a wireless communication system is disclosed. Specifically, the method comprises the steps of: calculating, within a first resource pool which is periodically defined, a predetermined metric with one or more resource units for a plurality of resource units included in the first resource pool; determining a transmission resource on the basis of the calculated metric; and transmitting a device-to-device communication signal to a reception user equipment using the transmission resource in a second resource pool subsequent to the first resource pool.

Abstract: A method for performing Device-to-Device (D2D) communication in a wireless communication system according to the present invention, the method according to the present invention comprises transmitting, by a D2D transmitting UE, a first message requesting allocation of radio resources to be used for D2D communication to an eNB; receiving, by the D2D transmitting UE, a second message including radio resource allocation information from the eNB; and transmitting, by the D2D transmitting UE, data through a radio resource area allocated by the second message, wherein the data are transmitted to the eNB and at least one D2D receiving UE.

Abstract: A method for allocating resources for a downlink control channel by a base station in a wireless communication system is disclosed. Specifically, the method comprises the steps of: mapping resource elements to resource element groups for each of resource blocks; forming control channel elements by using a predetermined number of resource element groups from among the resource element groups; and allocating control channel elements of a number corresponding to an aggregation level of the downlink control channel as resources for the downlink control channel, wherein the number of available resource elements included in each of the resource element groups or the number of available resource elements included in each of the control channel elements of a number corresponding to the aggregation level is uniform.

Abstract: The present invention relates to a method for transmitting a downlink control channel in a wireless communication system, and an apparatus therefor. Specifically, the method for transmitting an enhanced a physical downlink control channel (EPDCCH) from a serving cell comprises the steps of: forming a plurality of enhanced resource element groups (EREGs) by dividing available resource elements, comprised in one physical resource block (PRB) pair, into a predetermined number; forming an enhanced control channel element (ECCE), which is a resource allocation unit for the EPDCCH, by selecting one or more EREGs from among the plurality of EREGs; and transmitting the EPDCCH by means of the transmission resource allocated, for each ECCE, for the EPDCCH, wherein one or more EREGs forming the ECCE is selected on the basis of a cell identifier of the serving cell and/or an index of the one PRB pair.

Abstract: Provided are a discovery signal transmission method of a terminal supporting device-to-device (D2D) communication and a terminal device using such a method. The method comprises: directly receiving information on a specific discovery signal (DS) transmission mask or receiving discovery signal configuring information; selecting the specific DS transmission mask or one DS transmission mask from among a plurality of DS transmission masks indicated by the DS configuring information; and transmitting a discovery signal on the basis of the selected DS transmission mask.

Abstract: The present invention relates to a wireless communication system. In particular, provided are a method for managing, by a terminal, mobility in a wireless communication system, and an apparatus therefore, including the steps of: receiving a plurality of TA lists, wherein the plurality of TA lists include dedicated TA lists and shared TA lists; and when TA information of a current cell matches with the shared TA lists, selectively performing a TAU process according to a communication mode, wherein when the communication mode is a non-D2D, the TAU process is performed on an MME corresponding to the TA information about the current cell, and when the communication mode is D2D, the TAU process is skipped.

Abstract: Disclosed in the present application is a method for transmitting/receiving a signal using device-to-device communication by a user equipment in a wireless communication system. More specifically, the method comprises the steps of: transmitting a first signal in contention slot included in one of a plurality of contention intervals; receiving, in response to the first signal, a second signal in the contention slot in which the first signal is transmitted; and transmitting/receiving a data signal or a response signal to the data signal in at least one time resource corresponding to the one of the plurality of contention intervals by using device-to-device communication.

Abstract: A method for transmitting and receiving a signal by a terminal in a wireless communication system, according to one embodiment of the present invention, comprises the steps of: transmitting uplink data to a base station; and receiving an acknowledgement of reception of the uplink data, wherein a first area, to which the acknowledgement of reception is transmitted, is determined in such a manner that a difference value between the number of REs, to which a first antenna port is allocated, and the number of REs, to which a second antenna port is allocated, is a predetermined value or less.

Abstract: According to an embodiment of the present invention, a method for transmitting and receiving a signal in a wireless communications system includes the steps of: transmitting an uplink data in a first subframe to a base station; and receiving a reception confirmation response to the uplink data on a downlink time-frequency resource of a second subframe associated with the first subframe, wherein if the second subframe transmits a shortened DMRS (Demodulation Reference Signal), the downlink time-frequency resource is included in at least a part of REs (Resource Elements) adjacent to the RE (Resource Element) transmitting the shortened DMRS, and the RE transmitting the shortened DMRS is the cell specified one of the REs capable of being reserved for the DMRS.

Abstract: A method for receiving downlink control information by a terminal in a wireless communication system, according to one embodiment of the present invention, comprises the steps of: determining enhanced physical downlink control channel (EPDCCH) candidates per aggregation level in an enhanced physical downlink control channel physical resource block (EPDCCH PRB) set; and performing monitoring in a set of the EPDCCH candidates, wherein enhanced control channel elements (ECCE) constituting the respective EPDCCH candidates are distributed in the EPDCCH PRB set.

Abstract: One embodiment of the present invention relates to a method by which a base station transmits control information through an enhanced physical downlink control channel (EPDCCH) in a wireless communication system, and the control information transmission method comprises the steps of: mapping control information to an enhanced resource-element group (EREG) allocated to transmit the EPDCCH in a first EPDCCH physical resource block (PRB) set and a second EPDCCH PRB set, respectively; and transmitting the mapped control information, wherein an enhanced control channel element (ECCE) index corresponding to the EREG of the same position is connected with the same physical uplink control channel resource (PUCCH) in the first EPDCCH PRB set and the second EPDCCH PRB set, respectively.

Abstract: The present invention relates to a wireless communication system and, more particularly, to a method by which a terminal receives an EPDCCH signal in a wireless communication system and a device for the same, the method comprising the steps of receiving a subframe including an EPDCCH set, wherein the EPDCCH set includes a plurality of EPDCCH candidates; and monitoring the plurality of EPDCCH candidates in the EPDCCH set in order to receive the EPDCCH signal, wherein the number of EPDCCH candidates having an aggregation level of L in the EPDCCH set is indicated and is limited to a value of a specific form under a predetermined condition.

Abstract: The present invention relates to a wireless communication system. In particular, provided are a method for managing, by a terminal, mobility in a wireless communication system, and an apparatus therefore, including the steps of: receiving a plurality of TA lists, wherein the plurality of TA lists include dedicated TA lists and shared TA lists; and when TA information of a current cell matches with the shared TA lists, selectively performing a TAU process according to a communication mode, wherein when the communication mode is a non-D2D, the TAU process is performed on an MME corresponding to the TA information about the current cell, and when the communication mode is D2D, the TAU process is skipped.

Abstract: The present invention provides a method and a user device for receiving a downlink signal, and a method and a base station for transmitting a downlink signal. The method for a user device receiving the downlink signal in a wireless communication system, comprises: encoding downlink control channel candidates, each of which comprise at least one control channel element (CCE); and detecting the downlink control channel of the user device, wherein each of the downlink control channel candidates is encoded in accordance with a first downlink control information (DCI) format and a CCE type for the user device, or a second DCI format and a predetermined CCE type.