Methods for transmitting and receiving uplink data and apparatuses thereof

A method for transmitting uplink data by a user equipment, the method comprising:

• configuring carrier aggregation including a secondary cell which is using an unlicensed spectrum;
• receiving, by the user equipment, downlink control information including subframe allocation information for transmitting uplink data in the secondary cell, from a base station;
• and
• transmitting the uplink data through a plurality of consecutive subframes of the secondary cell based on the subframe allocation information,
• wherein the subframe allocation information comprises i) offset information for determination of a subframe in which the uplink data starts to be transmitted and ii) duration information indicating the number of subframes in which the uplink data is transmitted,
• wherein the offset information is configured to an information area of 4 bits in the downlink control information and indicates one of values from 0 to 15.

A method for receiving uplink data by a base station, the method comprising:

• controlling carrier aggregation configuration of a user equipment including a secondary cell which is using an unlicensed spectrum;
• transmitting, by the base station to the user equipment, downlink control information including subframe allocation information for transmitting uplink data in the secondary cell;
• and
• receiving the uplink data transmitted through a plurality of consecutive subframes of the secondary cell based on the subframe allocation information,
• wherein the subframe allocation information comprises i) offset information for determination of a subframe in which the uplink data starts to be transmitted and ii) duration information indicating the number of subframes in which the uplink data is transmitted,
• wherein the offset information is configured to an information area of 4 bits in the downlink control information and indicates one of values from 0 to 15.

A user equipment for transmitting uplink data, the user equipment comprising:

• a controller configured to configure carrier aggregation including a secondary cell which is using an unlicensed spectrum;
• a receiver configured to receive downlink control information including subframe allocation information for transmitting a uplink data in the secondary cell, from a base station;
• and
• a transmitter configured to transmit the uplink data through a plurality of consecutive subframes of the secondary cell based on the subframe allocation information,
• wherein the subframe allocation information comprises i) offset information for determination of a subframe in which the uplink data starts to be transmitted and ii) duration information indicating the number of subframes in which the uplink data is transmitted,
• wherein the offset information is configured to an information area of 4 bits in the downlink control information and indicates one of values from 0 to 15.