In one aspect, a wireless device receives a first data transmission from a base station in a first subframe interval and transmits HARQ feedback and/or CSI to the base station in a subsequent subframe interval, within a duration that is less than a maximum transmission duration that is possible within the subsequent subframe interval. In another aspect, a base station transmits a first data transmission to a wireless device in a first subframe interval and receives HARQ feedback and/or CSI from the wireless device in a subsequent subframe interval, within a duration that is less than a maximum transmission duration that is possible within the subsequent subframe interval.

A method and apparatus reduce latency of Long Term Evolution (LTE) uplink transmissions. An indication can be sent to a user equipment. The indication can indicate a set of frequency domain resource blocks for possible physical uplink shared channel transmission in an uplink subframe. A physical uplink shared channel can be received in a selected subset of resource blocks in the uplink subframe. The subset of resource blocks can be selected from the set of frequency domain resource blocks for possible physical uplink shared channel transmission based on a selection criterion. The selection criterion can use at least a resource set size acquired from the indication, a modulo function, and an identifier associated with the user equipment.

A method and apparatus for configuring a bi-directional channel in a wireless communication system is provided. A user equipment (UE) configures the bi-directional channel which is used for either an uplink (UL) channel or a sidelink (SL) channel, and transmits data via at least one of the UL channel or the SL channel. The bi-direction channel may be used for vehicle-to-everything (V2X) communication.

Provided are a method for receiving/decoding a system information block by a terminal and a device for supporting same. The terminal can receive one or more MIBs and receive/decode a first SIB on the basis of the received MIBs and a first time offset. The first SIB is an SIB which has been newly defined for a terminal having low complexity.

The present invention provides a method and device for transmitting/receiving an uplink signal. When a user equipment of the present invention is configured by multiple cell groups and multiple pieces of uplink control information (UCI) to be transmitted by the user equipment in a subframe are generated, the user equipment separately transmits, to the multiple cell groups, the UCI one by one from the piece of UCI having the highest priority, and drops the pieces of UCI having lower priorities among the multiple pieces of UCI.

The present invention relates to a wireless communication system. More specifically, the present invention relates to a method and a device for de-configuring a cell from PUCCH resource in a carrier aggregation system, the method comprising: configuring a Secondary Cell (SCell) with Physical Uplink Control Channel (PUCCH) resource; receiving an RRC signaling indicating that the PUCCH resource PUCCH resource is de-configured from the SCell; and de-activating the SCell after the UE de-configures the PUCCH resource from the SCell according to the RRC signaling.

The present invention relates to a wireless communication system. More specifically, the present invention relates to a method and a device for de-configuring a cell from PUCCH resource in a carrier aggregation system, the method comprising: configuring a Secondary Cell (SCell) with Physical Uplink Control Channel (PUCCH) resource; receiving a Radio Resource Control (RRC) signaling indicating that the PUCCH resource is de-configured from the SCell with the PUCCH resource; de-configuring the PUCCH resource from the SCell according to the RRC signaling; re-activating the SCell; and starting a SCell deactivation timer associated with the SCell.

Provided in the present invention is a method, base station, and user equipment for configuring a serving cell group. The method includes: a base station transmitting serving cell group configuration information to a user equipment having carrier aggregation capability, where the serving cell group configuration information indicates a reference cell used for transmitting uplink control information of a serving cell. The present invention allows the base station to flexibly configure multiple PUCCH reference cells and to configure different PUCCH reference cells on the basis of different cell loads.

A method for transmitting uplink control information and an apparatus therefor are disclosed. In a method for transmitting uplink control information using a physical uplink shared channel (PUSCH) in a wireless communication system, the method is performed by a terminal and includes receiving downlink control information including an accumulated number of physical downlink shared channels (PDSCH) transmissions associated with a cell group configured for the terminal, coding the uplink control information using the accumulated number of PDSCH transmissions, and transmitting the coded uplink control information using the PUSCH.

The present invention relates to a wireless communication system. More specifically, the present invention relates to a method and a device for initiating a random access procedure in a carrier aggregation system, the method comprising: receiving, from a network, a Radio Resource Control (RRC) signal which configures a Physical Uplink Control Channel (PUCCH) resource for a Secondary Cell (SCell) in a Timing Advance Group (TAG); and initiating random access procedure on the SCell with the PUCCH resource to be configured by the RRC signal if there is no cell with PUCCH resource other than the SCell in the TAG.