Disclosed are a method, an apparatus, and a system for adjusting a contention window size for performing channel access. In detail, the method includes: receiving a plurality of hybrid automatic repeat request acknowledgement (HARQ-ACK) responses for downlink channel(s) of the specific cell; generating a random number N (N≧0) in a contention window size; and performing the downlink transmission in the specific cell after standing by for N slots while the specific cell is idle, wherein when a ratio of negative acknowledgement (NACK) among the plurality of HARQ-ACK responses is equal to or more than a reference value, the contention window size becomes larger than a previous value, and when the ratio of the NACK among the plurality of HARQ-ACK responses is less than the reference value, the contention window size is reset to a minimum value.

Method, apparatus, and system for channel access in unlicensed band

A wireless device receives one or more messages comprising configuration parameters of a licensed assisted access (LAA) cell. The wireless device receives a downlink control information (DCI) for the LAA cell. The DCI may comprise a first field and a second field. The first field indicates uplink resources for an uplink subframe of the LAA cell. The second field indicates a first starting position in a plurality of starting positions in the uplink subframe. The first starting position in the uplink subframe is determined, at least, based on a sum of twenty-five micro-seconds plus a timing advance value. The wireless device constructs one or more transport blocks employing the DCI. The wireless device transmits the one or more transport blocks in the uplink resources starting from the first starting position of the uplink subframe.

Uplink signal starting position in a wireless device and wireless network

Discloses are a method for a terminal for transmitting an uplink signal to a base station and an apparatus supporting the method in a licensed assisted access (LAA) system in which a base station or a terminal transmits listen-before-talk (LBT)-based signals. Specifically, disclosed are a method for a terminal transmitting an uplink signal by executing a particular LBT action and an apparatus supporting the method if the uplink signal is transmitted by the terminal by sharing a maximum channel occupancy time (MCOT) with a base station.

Method for transmitting uplink signal and apparatus supporting method in wireless communication system supporting non-licensed band

A user equipment (UE) for reporting uplink control information (UCI) when one or more Licensed-Assisted Access (LAA) serving cells are configured is described. The UE includes a processor and memory in electronic communication with the processor. Instructions stored in the memory are executable to determine if physical uplink shared channel (PUSCH) transmissions are scheduled on LAA serving cells and licensed cells. The instructions are also executable to determine a type of UCI to be reported. The instructions are further executable to determine a channel and cells to carry different UCI. The instructions are additionally executable to transmit the channel on the cells determined to carry UCI. The instructions are also executable to determine whether a LAA PUSCH is transmitted and UCI is multiplexed. The instructions are further executable to drop LAA PUSCH or transmit LAA PUSCH subject to listen-before-talk (LBT).

Systems and methods for uplink control information reporting with license-assisted access (LAA) uplink transmissions

The present invention relates to a wireless access system supporting an unlicensed band and provides methods for performing a channel access process for transmitting different types of signals, and devices supporting the same. According to one embodiment of the present invention, a method for transmitting different types of signals in a wireless access system supporting an unlicensed band can comprise the steps of: performing a first channel process (CAP) for transmitting a first type of signal; and transmitting a transmission burst including the first type of signal through the unlicensed band if it is determined that a serving cell (SCell) of the unlicensed band is in an idle state after performing the first CAP. At this time, at least one of first parameters for performing the first CAP can be set to be value less than that of second parameters for performing a second CAP for transmitting a second type of signal.

Method and device for performing channel access process for transmitting different types of signals in wireless access system supporting unlicensed band

A method, a device, and a system for transmitting a downlink signal is provided. The method includes monitoring a first common control channel indicating a downlink (DL) interval of subframe (SF) #(n−1) and SF #n, monitoring a second common control channel indicating a DL interval of SF #n and SF #(n+1), and performing a DL reception process in the SF #n based on a detection result of the first common control channel and a detection result of second common control channel. The DL interval represents occupied OFDM symbols in a DL subframe.

Method, device, and system for transmitting signals in unlicensed band

Disclosed relates to a method, device, and system for performing downlink transmission. Specifically, the disclosed relates to a method including when the downlink signal includes a physical downlink shared channel (PDSCH) and a channel in the specific cell is sensed to be idle for a first predefined interval, wherein the processor performs backoff after the second predefined time in order to perform the downlink transmission, and when the downlink transmission includes a Discovery Reference Signal (DRS) and the channel in the specific cell is sensed to be idle for a second predefined interval, performing the downlink transmission immediately after the second predefined interval, and a device and system therefor.

Method, device, and system for signal transmission in unlicensed band

The present invention relates to a wireless communication system, and to a method and an apparatus therefor, the method comprising the steps of: receiving configuration information on a periodic signal via a signal of an upper layer, wherein a transmission/reception position of the periodic signal is configured as a first symbol set in each slot periodically set; monitoring a PDCCH associated with a slot configuration of a first slot to receive slot configuration information for the first slot in which the transmission/reception position of the periodic signal exists; and performing a process for transmitting/receiving the periodic signal in the first slot, wherein when the first symbol set in the first slot is designated as a flexible symbol by the upper layer, the transmission/reception of the periodic signal in the first slot is selectively performed according to a detection result of the PDCCH, and the flexible symbol means a symbol whose use can be re-designated to DL, UL or flexible according to the slot configuration information of the PDCCH.

Method, apparatus and system for transmitting and receiving control channel of wireless communication system

The present invention relates to a method for performing uplink transmission to a base station through an unlicensed cell in a wireless communication system. In particular, the invention provides a method including: receiving, from the base station, an uplink grant scheduling the uplink transmission on one or more subframes; and performing the uplink transmission on the one or more subframes using one of a first type channel access or a second type channel access indicated in the uplink grant, wherein a parameter for the first type channel access is determined according to a priority included in the uplink grant, and wherein when the uplink grant indicates the second type channel access, the priority is a priority used in a downlink channel access of the base station.

Method for uplink channel access to unlicensed band in wireless communication system and apparatus for same

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