Abstract:
Disclosed are a method and an apparatus for transmitting uplink data by means of multiple serving cells. A method for a terminal for transmitting uplink data by means of multiple serving cells may comprise the steps of: the terminal receiving a first timing advance command (TAC) for a first serving cell and a second TAC for a second serving cell; and determining whether the terminal transmits uplink data by means of the second serving cell on the basis of whether the timing difference is below the threshold value, wherein the timing difference is acquired on the basis of the first TAC and the second TAC, and the first serving cell can be a cell configured so that an uplink can be always transmitted regardless of the timing difference.
Abstract:
Disclosed are a method and an apparatus for transmitting a reference signal. A method for receiving a reference signal may comprise the steps of: a subframe including a plurality of resource blocks (RB) and a plurality of OFDM symbols receiving a synchronization signal; and determining the number of RBs which are included in one precoding resource block group (PRB), on the basis of the size of a total system bandwidth, wherein the RBs included in the PRG may include information to which identical precoding has been applied. The synchronization signal is received by six core RBs from the plurality of RBs, and the reference signal can be received by at least one OFDM symbol from the plurality of OFDM symbols, excluding the first and second OFDM symbols, through a plurality of PRGs including the six core RBs. As a result, a channel can be accurately estimated on the basis of the reference signal.
Abstract:
The present invention provides methods for transmitting a scheduling request (SR) in a wireless access system supporting a multiple connection mode, in which a terminal is connected to two or more small cells, and apparatuses supporting the same. According to one embodiment of the present invention, a method for transmitting an SR, by a terminal, in a wireless access system supporting a multiple connection mode comprises the steps of: receiving an upper layer signal including an SR parameter for SR transmission from a first small cell which is in a multiple connection mode state; generating an SR on the basis of the SR parameter; and transmitting the SR using a physical uplink control channel (PUCCH) signal. Herein, the SR parameter is pre-set by negotiation between the first small cell and a second small cell which is in a multiple connection mode. Furthermore, in the multiple connection mode, the terminal maintains multiple connections with two or more small cells including the first small cell and the second small cell, and the first small cell and the second small cell may be connected to each other via a non-ideal backhaul link.
Abstract:
The present invention relates to a wireless communication system. More particularly, the present invention relates to a method for transmitting uplink control information and a device therefor, the method comprising the steps of: forming a plurality of serving cells each having different UL-DL configurations; receiving one or more signals requiring a HARQ-ACK response from M(M≧1) number of subframes; and executing the process for transmitting the HARQ-ACK response to the one or more signals in a specific subframe corresponding to the M number of subframes, wherein, only when the specific subframe is set as an uplink in all of the plurality of serving cells, the HARQ-ACK response to the one or more signals are transmitted through the specific subframe.
Abstract:
A method for and apparatus for performing data transmission in a wireless communication system is provided. A wireless device performs a radio resource control (RRC) connection procedure with a macro cell having a first frequency, performs a radio resource management (RRM) measurement on a small cell having a second frequency or a third frequency, and reporting a result of the RRM measurement to the macro cell; and receives data via the second frequency or the third frequency of the TP, the data is consecutive data relayed from an initial transmission of the macro cell, wherein the macro cell and the small cell are connected with a fast backhaul by using air interface.
Abstract:
Provided are a communication method of a terminal in a wireless communication system and the terminal using the method. The method comprises: receiving a cell state signal from a small cell; and communicating with the small cell on the basis of the cell state signal, wherein the cell state signal includes information indicating the switching of the small cell to an off-state.
Abstract:
The present invention relates to a wireless communication system. More specifically, the present invention relates to a method for transmitting an uplink signal in the wireless communication system supporting carrier aggregation (CA), and to the apparatus for same, the method comprising the steps of: setting a scheduling cell, which has a first uplink-downlink (UL-DL) configuration, and setting a scheduled cell, which has a second TDD UL-DL configuration; and carrying out a HARQ process from the scheduled cell based on the number of HARQ processes for the scheduled cell.
Abstract:
A method for and apparatus for performing a measurement in a wireless communication system is provided. A wireless device determines information about a measurement type, the measurement type indicating one of a first measurement object and a second measurement object and performs measurement using a measurement signal at subframe(s) configured in the measurement object indicated by the measurement type. The measurement signal includes one of a discovery signal, a measurement reference signal (MRS) and a cell-common RS (CRS).
Abstract:
The present invention relates to a wireless communication and, more specifically, to a method for transmitting an HARQ) response by a UE in a wireless communication system, and an apparatus for the same. The method includes receiving an E-PDCCH signal on at least one of a plurality of enhanced physical downlink control channel (E-PDCCH) sets, each E-PDCCH set including a plurality of resources units indexed per E-PDCCH set; and transmitting the HARQ response using a physical uplink control channel (PUCCH) resource determined using the index of the first resource unit among one or more resource units carrying the E-PDCCH signal, wherein the index of the first resource unit is determined on the basis of the E-PDCCH set having the lowest index among the plurality of E-PDCCH sets when specific conditions are satisfied.
Abstract:
A method for transmitting uplink control information by a user equipment in a wireless communication system supporting carrier aggregation of a plurality of cells and operating in a time division duplex (TDD). The method according to one embodiment includes receiving, by the user equipment, downlink signals on the plurality of cells, each of the downlink signals requiring a hybrid automatic repeat request acknowledgement (HARQ-ACK) response; and transmitting, by the user equipment, the uplink control information including at least one per-cell HARQ-ACK bit for each cell in an uplink subframe via a physical uplink shared channel (PUSCH). When a reference uplink-downlink (UL-DL) configuration for performing the receiving and the transmitting belongs to a first UL-DL configuration set on each of the plurality of cells, a number of the at least one per-cell HARQ-ACK bit for each cell is determined using a value of min (W, Mc). Min (W, Mc) denotes a smallest value of W and Mc, W denotes a value indicated by 2-bit downlink assignment index (DAI) information included in downlink control information corresponding to the PUSCH, and Mc denotes a number of downlink subframes corresponding to the uplink subframe for each cell.